CN113275204A

CN113275204A - Equipment and method for continuously coating insulating coating on amorphous nanocrystalline strip

Info

Publication number: CN113275204A
Application number: CN202010197302.8A
Authority: CN
Inventors: 刘天成; 潘贇; 陈非非; 戴白杨; 贾春波; 刘迎春; 洪兴; 李广敏
Original assignee: Advanced Technology and Materials Co Ltd
Current assignee: Advanced Technology and Materials Co Ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2021-08-20

Abstract

The invention belongs to the technical field of coating, and particularly relates to equipment and a method for continuously coating an insulating coating on an amorphous nanocrystalline strip. The equipment can stably, uniformly and continuously coat the insulating coating on the amorphous nanocrystalline strip. The equipment can clean the surface of the strip material, and solves the technical problem that the insulating coating has uneven thickness and even falls off due to the existence of impurities in the prior art. In addition, the equipment can measure the insulating property of the coated amorphous nanocrystalline strip in real time, and the measured data is a voltage resistance value and a resistance value which can directly reflect the insulating property of the insulating coating. In addition, any one of coating modes of brushing, spraying and dip-coating can be selected, and a thickness control device is combined to extrude redundant liquid on the surface of the strip, so that the liquid quantity is ensured, the liquid film can be further homogenized, and the thickness of the insulating coating can be controlled.

Description

Equipment and method for continuously coating insulating coating on amorphous nanocrystalline strip

Technical Field

The invention belongs to the technical field of coating, and particularly relates to equipment and a method for continuously coating an insulating coating on an amorphous nanocrystalline strip.

Background

Since the discovery of the last century, amorphous nanocrystalline magnetically soft alloys have been widely used in the power electronics field due to their characteristics of high initial permeability, saturation magnetic flux, resistivity, curie temperature, low coercivity, temperature coefficient of resistance, magnetostriction coefficient, and corrosion resistance and aging resistance. However, under some working conditions with high frequency, high power and high energy conversion, the amorphous nanocrystalline magnetic ring will face a lot of problems such as severe eddy current loss, magnetic ring breakdown caused under high voltage condition, magnetic ring erosion caused by water cooling system required for long-time working, and the like. In order to solve the above problems, the mainstream method at present is to add an insulating layer between amorphous nanocrystalline strips to control eddy current loss, and simultaneously perform insulation protection on the strips to prevent magnetic ring breakdown, and the insulating layer is generally a uniform and compact inorganic oxide to reduce erosion to the magnetic ring caused by long-term water cooling.

Several patents and literature describe methods and techniques for applying insulating coatings between amorphous nanocrystalline ribbon layers. Patent document US5083366A proposes that a solution formed by mixing silanol oligomer and ceramic particles is attached to the surface of a strip by dip coating, which is limited to a solution having a limited viscosity suitable for this method, and the thickness of the solution tends to be inconsistent at the edges and the center of the strip when the solution is attached to the surface of the strip only by the surface tension of the solution itself. Patent document EP0695812B1 proposes the use of dip coating, roll coating and spray coating to form an insulating coating on the surface of the strip, but said method does not allow the control of the thickness of the liquid surface during continuous production. Meanwhile, in the process of continuously coating the surface of the strip material by using the method proposed by the patent document, single-side coating is difficult to realize or the consistency of the single-side coating is ensured, and the single-side insulating coating is important for controlling the stress generated by the insulating medium to the magnetic ring to be uniform and consistent in the subsequent annealing process.

In addition, in the continuous coating process, it is also critical to constantly ensure the stability and uniformity of the strip coating operation, and patent document WO2009/092459Al proposes a method for controlling the thickness of an insulating coating in real time by using an infrared measurement device, but the method requires high equipment precision, and simultaneously evaluates the quality of the insulating coating by measuring the thickness of the insulating layer, the thickness of the insulating coating in the method is an indirect parameter, and in practical application, the insulation properties of the coating such as a withstand voltage value, a resistance value and the like are often used, and the insulation properties of the insulating coating in the continuous coating process are difficult to directly reflect.

In summary, in the prior art, the thickness of the insulating coating is controlled mainly by the difference between the liquid self-flowing and the coating method, and it is difficult to achieve the uniformity and stability of the thickness of the insulating coating. In addition, the existing equipment and method for continuously preparing the amorphous nanocrystalline strip insulating coating have the problems of single coating process and unstable performance control.

Therefore, it is important to develop an apparatus and method for continuously coating an insulating coating on an amorphous nanocrystalline ribbon, which can solve the above technical problems.

Disclosure of Invention

In view of the above problems, the present invention provides an apparatus for continuously coating an insulating coating on an amorphous nanocrystalline ribbon, the apparatus comprising: the device comprises a cleaning device 2, a drying device 3, a coating device 4, a thickness control device 5, a heating device 6 and an insulation performance testing device 9;

the cleaning device 2 is used for cleaning the surface of the amorphous nanocrystalline strip;

the drying device 3 is used for drying the cleaned amorphous nanocrystalline strip;

the coating device 4 is used for coating an insulating material solution on the surface of the dried amorphous nanocrystalline strip;

the thickness control device 5 is used for carrying out homogenization treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip;

the heating device 6 is used for carrying out surface drying and curing treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip to form an insulating coating;

the insulation performance testing device 9 is used for testing the insulation performance of the insulation coating formed on the surface of the amorphous nanocrystalline strip.

Furthermore, the equipment also comprises an unreeling device 1, a pinch device 7, a tension control device 8 and a reeling device 10;

the unreeling device 1 is used for conveying the amorphous nanocrystalline strips to the cleaning device 2;

the clamping and conveying device 7 is used for conveying the amorphous nanocrystalline strip coated with the insulating coating and output by the heating device 6 to the tension control device 8;

the tension control device 8 is used for controlling the tension of the amorphous nanocrystalline strip coated with the insulating coating, so that the tightness degree of a material tray of the winding device 10 is consistent;

the winding device 10 is used for winding the strip transmitted from the insulation performance testing device 9.

Further, the cleaning device 2 is arranged behind the unwinding device 1; the drying device 3 is arranged behind the cleaning device 2; the coating device 4 is arranged behind the drying device 3; the thickness control device 5 is arranged behind the coating device 4; the heating device 6 is arranged behind the thickness control device 5; the clamping and conveying device 7 is arranged behind the heating device 6; the tension control device 8 is arranged behind the clamping and conveying device 7; the insulation performance testing device 9 is arranged behind the tension control device 8; the winding device 10 is arranged behind the insulation performance testing device 9.

Further, the cleaning device 2 comprises a first rotating roller 2.2, a second rotating roller 2.4 and a third rotating roller 2.5, wherein the first rotating roller 2.2 and the third rotating roller 2.5 are respectively arranged at two sides of the second rotating roller 2.4;

the first rotating roller 2.2 and the third rotating roller 2.5 have the same axle center height;

the height of the second rotating roller 2.4 is lower than the height of the first rotating roller 2.2 and the third rotating roller 2.5;

the top of the cleaning device is provided with a first spray head 2.3;

a first feeding hole 2.1 and a first discharging hole 2.6 are respectively arranged on two opposite side walls of the cleaning device;

the diameter of the second rotating roller 2.4 is 30-50 mm;

the first rotating roller 2.2, the second rotating roller 2.4 and the third rotating roller 2.5 are all made of metal with corrosion resistance.

Further, the drying device 3 is provided with a heat-insulating interlayer;

the drying device 3 comprises a fourth rotating roller 3.3, a fifth rotating roller 3.5 and a sixth rotating roller 3.6; the fourth rotating roller 3.3, the fifth rotating roller 3.5 and the sixth rotating roller 3.6 are arranged in a triangular shape;

the fifth rotating roller 3.5 is positioned above the fourth rotating roller 3.3 and the sixth rotating roller 3.6, and the fifth rotating roller 3.5 can move up and down; the fourth rotating roller 3.3 and the sixth rotating roller 3.6 are the same in height;

the top and the bottom of the drying device are respectively provided with a hot air outlet 3.4 and a hot air inlet 3.1;

a second feeding hole 3.2 and a second discharging hole 3.7 are respectively arranged on two opposite side walls of the drying device; the second feeding hole 3.2 and the second discharging hole 3.7 are the same in height.

Further, the coating device 4 comprises a main rotating roller group, a coating belt 4.7 and an auxiliary rotating roller group;

the coating belt 4.7 is wrapped on the main rotating roller group; the outer layer of the coating belt 4.7 is made of rubber, cotton cloth and sponge;

the main rotating roller group comprises a seventh rotating roller 4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6; the diameters of the seventh rotating roller 4.4, the eighth rotating roller 4.5 and the ninth rotating roller 4.6 are 50-80 mm;

the auxiliary rotating roller group comprises a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10;

the seventh rotating roller 4.4, the eighth rotating roller 4.5, the ninth rotating roller 4.6, the tenth rotating roller 4.8, the eleventh rotating roller 4.9 and the twelfth rotating roller 4.10 are arranged in parallel;

the diameters of the tenth rotating roller 4.8, the eleventh rotating roller 4.9 and the twelfth rotating roller 4.10 are 30-50 mm;

a third feeding port 4.1 and a third discharging port 4.12 are arranged on the side wall of the coating device;

a second spray head 4.2 is arranged on the coating device;

and an air knife 4.3 is arranged on the side wall of the coating device.

Further, the thickness control device includes a thirteenth rotating roller, a fourteenth rotating roller;

the thirteenth rotating roller and the fourteenth rotating roller have the same diameter;

a distance between the thirteenth rotating roller and the fourteenth rotating roller is adjustable; the distance between the thirteenth rotating roller and the fourteenth rotating roller is 0-5 mm;

and a solution recovery tank is arranged below the thickness control device.

Further, the heating device 6 comprises a heating element 6.3;

the heating device is provided with a temperature control thermocouple and a bracket 6.2;

the heating device is provided with a heat-insulating layer and a sealing layer; the thickness of the heat insulation layer is 50-100 mm;

the heating device is provided with an air inlet and an air outlet;

and a fourth feeding hole 6.1 and a fourth discharging hole 6.4 are respectively arranged on two opposite side walls of the heating device.

Further, the insulation performance testing device 9 comprises a fifteenth rotating roller 9.1, a sixteenth rotating roller 9.3; the diameters of the fifteenth rotating roller 9.1 and the sixteenth rotating roller 9.3 are 10-30 mm;

the fifteenth rotating roller 9.1 and the sixteenth rotating roller 9.3 are capable of relative rotation.

Further, the unwinding device 1 comprises a first fixture 1.2, a first rotating shaft 1.1 and a first baffle 1.3; the first fixture 1.2 is fixed on the first rotating shaft 1.1; the first fixture 1.2 is used for fixing the lining of the strip material tray; the first baffle 1.3 is used for supporting two sides of a material disc of the strip material;

the pinch device 7 comprises a seventeenth rotating roller 7.1 and an eighteenth rotating roller 7.2, and the diameters of the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 are the same; the clamping force between the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 can be adjusted; the clamping force between the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 is 1-50N;

the tension control device comprises a tension sensor and a tension controller;

the winding device 10 comprises a second rotating shaft 10.1, a second fixture 10.2 and a second baffle 10.3; the second clamp 10.2 is used for clamping the lining of the strip disc; the second baffles 10.3 are used for supporting two sides of the material disc of the strip material.

The invention also provides a method for continuously coating the insulating coating on the amorphous nanocrystalline strip, which comprises the following steps:

(1) a cleaning step, cleaning the surface of the amorphous nanocrystalline strip by using a cleaning agent in a cleaning device;

(2) drying, namely drying the cleaned amorphous nanocrystalline strip by using a drying device to remove a cleaning agent attached to the surface of the amorphous nanocrystalline strip;

(3) coating, namely coating an insulating material solution on the surface of the amorphous nanocrystalline strip by a coating device; the coating mode comprises at least one of spraying, dip coating and brush coating, and the coating step is used for forming insulating material liquid film adhesion on the surface of the strip;

(4) a liquid film thickness control step, wherein after a liquid film is attached to the surface of the strip material, the strip material is subjected to homogenization treatment on the liquid film on the surface of the strip material through a thickness control device;

(5) surface drying and curing, namely performing surface drying and curing treatment on the liquid film on the surface of the strip in a heating device to form an insulating coating on the surface of the amorphous nanocrystalline strip;

(6) and an insulation performance testing step, wherein the insulation performance testing device tests the insulation performance of the insulation coating formed on the surface of the strip.

Further, in the cleaning step, the cleaning mode is at least one of spray cleaning, immersion cleaning and scrubbing by utilizing the outer layer of the surface of the second rotating roller;

the cleaning agent is at least one of absolute ethyl alcohol, water, a sodium carbonate solution, a sodium metasilicate solution and a sodium citrate solution; the cleaning time is 10-30 s;

in the drying step, the temperature of the drying step is room temperature to 300 ℃; the drying time is 10-90 s;

in the coating step, the coating step is performed under a protective atmosphere, wherein the protective atmosphere is at least one of nitrogen, argon, hydrogen and dry air.

Further, the liquid film thickness control step specifically comprises: adjusting the gap between the rotating rollers of the thickness control device, wherein the strip attached with the liquid film passes through the thickness control device, and the redundant solution is extruded out of the surface of the strip to achieve uniform thickness;

the surface drying and curing steps are carried out in a protective atmosphere; the protective atmosphere is at least one of nitrogen, argon, hydrogen or dry air; the temperature of the surface drying and curing step is 100-400 ℃; the time of the surface drying and curing step is 10 to 300 s.

The invention has the beneficial effects that:

the invention provides equipment and a method for continuously coating an insulating coating on an amorphous nanocrystalline strip, which realize continuous controllable single-sided or double-sided coating on the amorphous nanocrystalline strip and realize real-time measurement of the insulating property of the coated amorphous nanocrystalline strip.

The equipment can stably, uniformly and continuously coat the insulating coating on the amorphous nanocrystalline strip. The equipment can clean the surface of the strip material, solves the technical problem that the insulating coating has uneven thickness and even falls off due to the existence of impurities in the prior art, and improves the consistency of the insulating coating. In addition, the equipment can measure the insulating property of the coated amorphous nanocrystalline strip in real time, and the measured data is a voltage resistance value and a resistance value which can directly reflect the insulating property of the insulating coating.

In addition, any one of coating modes of brushing, spraying and dip-coating can be selected, and a thickness control device is combined to extrude redundant liquid on the surface of the strip, so that the liquid quantity is ensured, the liquid film can be further homogenized, and the thickness of the insulating coating can be controlled.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an apparatus for applying an insulating coating to an amorphous nanocrystalline ribbon in an embodiment of the present invention;

FIG. 2 is a schematic view of an unwinding device;

FIG. 3 is a left side view of the cleaning device;

FIG. 4 is an elevational, cross-sectional view of the cleaning apparatus;

FIG. 5 is a cross-sectional view of the surface of the strip material cleaned by the first nozzle of the cleaning apparatus;

FIG. 6 is a cross-sectional view of the strip being immersed in a cleaning apparatus for cleaning;

fig. 7 is a left side view of the drying apparatus;

fig. 8 is a front sectional view of the drying apparatus;

FIG. 9 is an elevational view, in cross section, of the strip passing through the interior of the drying apparatus;

FIG. 10 is a left side view of the coating device;

FIG. 11 is an elevational, sectional view of the coating apparatus;

FIG. 12 is an elevational cross-sectional view of a solution being sprayed onto a surface of a strip material by a spray head of a coating apparatus;

FIG. 13 is an elevational cross-sectional view of a strip being coated with a solution using a coating strip of a coating apparatus;

FIG. 14 is an elevational cross-sectional view of a dip coating solution for a strip surface using a coating band of a coating apparatus;

FIG. 15 is a left side view of the heating device;

FIG. 16 is an elevational, sectional view of the heating apparatus;

FIG. 17 is a schematic view of a pinch device;

FIG. 18 is a schematic view of an insulation performance testing apparatus;

fig. 19 is a front view of the insulation performance testing apparatus;

FIG. 20 is a front view of an insulation performance test of the insulation coating on the surface of a strip using an insulation performance testing apparatus;

FIG. 21 is a left side view of the winding device;

FIG. 22 is a cross-sectional photograph under a scanning electron microscope of the nanocrystalline strip (national standard No. 1K107) coated in example 3.

Wherein, 1-unreeling device, 2-cleaning device, 3-drying device, 4-coating device, 5-thickness control device, 6-heating device, 7-clamping device, 8-tension control device, 9-insulation performance testing device, 10-reeling device, 1.1-first rotating shaft, 1.2-first fixture, 1.3-first baffle, 2.1-first feeding hole, 2.2-first rotating roller, 2.3-first spray head, 2.4-second rotating roller, 2.5-third rotating roller, 2.6-first discharging hole, 3.1-hot air inlet, 3.2-second feeding hole, 3.3-fourth rotating roller, 3.4-hot air outlet, 3.5-fifth rotating roller, 3.6-sixth rotating roller, 3.7-second discharging hole, 4.1-third feeding hole, 4.2-second spray head, 4.3-air knife, 4.4-seventh rotating roller, 4.5-eighth rotating roller, 4.6-ninth rotating roller, 4.7-coating belt, 4.8-tenth rotating roller, 4.9-eleventh rotating roller, 4.10-twelfth rotating roller, 4.11-lifting part, 4.12-third discharge port, 4.13-material notch, 6.1-fourth feed port, 6.2-bracket, 6.3-heating element, 6.4-fourth discharge port, 7.1-seventeenth rotating roller, 7.2-eighteenth rotating roller, 9.1-fifteenth rotating roller, 9.2-rotating shaft, 9.3-sixteenth rotating roller, 10.1-second rotating shaft, 10.2-second clamp and 10.3-second baffle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides an apparatus for continuously coating an insulating coating on an amorphous nanocrystalline ribbon, as shown in fig. 1, the apparatus including: the device comprises an unwinding device 1, a cleaning device 2, a drying device 3, a coating device 4, a thickness control device 5, a heating device 6, a clamping and conveying device 7, a tension control device 8, an insulation performance testing device 9 and a winding device 10. The cleaning device 2 is arranged behind the unreeling device 1; the drying device 3 is arranged behind the cleaning device 2; the coating device 4 is arranged behind the drying device 3; the thickness control device 5 is arranged behind the coating device 4; the heating device 6 is arranged behind the thickness control device 5; the clamping and conveying device 7 is arranged behind the heating device 6; the tension control device 8 is arranged behind the clamping and conveying device 7; the insulation performance testing device 9 is arranged behind the tension control device 8; the winding device 10 is arranged behind the insulation performance testing device 9.

The unreeling device 1 is used for conveying the amorphous nanocrystalline strips to the cleaning device 2; the cleaning device 2 is used for cleaning the surface of the amorphous nanocrystalline strip; the drying device 3 is used for drying the cleaned amorphous nanocrystalline strip; the coating device 4 is used for coating an insulating material solution on the surface of the dried amorphous nanocrystalline strip; the thickness control device 5 is used for carrying out homogenization treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip; the heating device 6 is used for carrying out surface drying and curing treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip to form an insulating coating; the clamping and conveying device 7 is used for conveying the amorphous nanocrystalline strip coated with the insulating coating and output by the heating device to the tension control device 8; the tension control device 8 is used for controlling the tension of the amorphous nanocrystalline strip coated with the insulating coating, so that the tightness degree of a material tray of the winding device 10 is consistent; the insulation performance testing device 9 is used for testing the insulation performance of an insulation coating formed on the surface of the amorphous nanocrystalline strip; the winding device 10 is used for winding the strip transmitted from the insulation performance testing device 9.

Fig. 2 is a schematic view of an unwinding device, and as shown in fig. 2, the unwinding device 1 is composed of a pair of first fixtures 1.2 capable of being fixed on a first rotating shaft 1.1 and first baffles 1.3, and the device fixes the inner lining of a strip material tray through the first fixtures 1.2, and simultaneously supports both sides of the strip material tray by using the first baffles 1.3 to prevent the material tray from tilting during a continuous coating process;

fig. 3 is a left side view of the cleaning apparatus, and fig. 4-6 are sectional views of fig. 3 taken along B-B. As shown in fig. 3 to 4, the cleaning device 2 has a semi-closed structure, and specifically, the cleaning device may be a semi-closed trough; the cleaning device comprises a first rotating roller 2.2, a second rotating roller 2.4 and a third rotating roller 2.5, wherein the second rotating roller 2.4 is positioned at a lower position, and the first rotating roller 2.2 and the third rotating roller 2.5 are arranged at two sides of the second rotating roller 2.4; the first rotating roller 2.2 and the third rotating roller 2.5 have the same axle center height, and the second rotating roller 2.4 is lower than the first rotating roller 2.2 and the third rotating roller 2.5. The second turning roll 2.4 is a main turning roll and the first turning roll 2.2 and said third turning roll 2.5 are secondary turning rolls. The top of the cleaning device is provided with a first spray head 2.3, and two opposite side walls of the cleaning device are respectively provided with a first feed inlet 2.1 and a first discharge outlet 2.6, so that a strip can conveniently pass through the cleaning device.

The diameter of the second rotating roller 2.4 is preferably 30-50 mm, such as 30mm, 40mm and 50 mm; in addition, the material of the first rotating roller 2.2, the second rotating roller 2.4 and the third rotating roller 2.5 is preferably a metal with corrosion resistance, such as stainless steel, titanium alloy and aluminum alloy, etc., the first spray head 2.3 is preferably a pressure atomizing spray head, and the pressure parameter is adjustable within 0.5-3 MPa, such as 1MPa, 1.5MPa, 2.5MPa and 3 MPa. Because the strip is difficult to avoid having impurity attached to on the surface in the in-process of production, roller shear, rewinding, storage and transport, and the existence of impurity can lead to the insulating coating of here uneven thickness to appear and drop even, above-mentioned belt cleaning device can wash the strip surface, has solved the problem that exists among the prior art, has increased insulating coating's uniformity.

Fig. 7 is a left side view of the drying apparatus, and fig. 8-9 are sectional views of fig. 7 taken along a-a. As shown in fig. 7-8, the main structure of the drying device 3 is a box body, a heat-insulating interlayer is installed on the wall of the drying device, the interior of the drying device includes a fourth rotating roller 3.3, a fifth rotating roller 3.5 and a sixth rotating roller 3.6 which are arranged in an isosceles triangle and used for supporting the movement of the strip, the heights of the fourth rotating roller 3.3 and the sixth rotating roller 3.6 which are positioned below are the same, the fifth rotating roller 3.5 positioned above can move up and down to change the passing distance of the strip in the drying device, meanwhile, a hot air outlet 3.4 and a hot air inlet 3.1 are respectively arranged at the top and the bottom of the drying device and used for conveying hot air for drying, and a second feeding port 3.2 and a second discharging port 3.7 are respectively arranged on two opposite side walls of the drying device, so that the strip can conveniently pass through;

the drying device 3 needs to be additionally matched with a heating device and a blower, the blower is preferably a low-pressure blower, the total pressure of the low-pressure blower is less than 1000Pa, and the types of the blower include but are not limited to a centrifugal blower and an axial flow blower; the drying device can provide the temperature of room temperature-300 ℃, the drying device can utilize modes such as quartz tube heating, silicon carbide rod heating, cast copper heating, and the hot air outlet 3.4 that is located the drying device top can external exhaust fan or gas recovery unit for the gaseous that produces when handling the stoving cleaner.

Fig. 10 is a left side view of the painting apparatus, and fig. 11 to 14 are sectional views of fig. 10 taken along C-C. As shown in fig. 10-11, the coating device 4 may be a semi-enclosed trough; the coating device 4 comprises a main rotating roller set, a coating belt 4.7 and an auxiliary rotating roller set; the coating belt 4.7 is wrapped on the main rotating roller group; the main rotating roller group comprises a seventh rotating roller 4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6; the auxiliary rotating roller group comprises a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10;

the seventh rotating roller 4.4, the eighth rotating roller 4.5, the ninth rotating roller 4.6, the tenth rotating roller 4.8, the eleventh rotating roller 4.9 and the twelfth rotating roller 4.10 are arranged in parallel; the connecting line of the axle center of the seventh rotating roller 4.4 and the axle center of the eighth rotating roller 4.5 is vertical to the horizontal line; the height of the ninth turning roller 4.6 is less than the height of the seventh turning roller 4.4, the eighth turning roller 4.5, the tenth turning roller 4.8, the eleventh turning roller 4.9 and the twelfth turning roller 4.10; the tenth turning roller 4.8 has the same height as the eleventh turning roller 4.9. The coating device further comprises a lifting component 4.11, the lifting component 4.11 is connected with the seventh rotating roller 4.4, and the lifting component 4.11 is used for adjusting the position of the seventh rotating roller 4.4.

A third feeding port 4.1 and a third discharging port 4.12 are arranged on the side wall of the coating device; a second spray nozzle 4.2 is arranged above the horizontal section of the coating device; an air knife 4.3 is arranged on the wall side of the vertical section coating device, and meanwhile, the air knife 4.3 is externally connected with auxiliary equipment to be introduced with protective gas. The tenth rotating roller 4.8 is used for simultaneously supporting the movement of the strip, and the eleventh rotating roller 4.9 is used for ensuring that the strip is jointed with the eleventh rotating roller 4.9 when the strip passes through, ensuring that the strip is jointed with the eighth rotating roller 4.5 simultaneously, and simultaneously supporting the movement of the strip. In order to make the strips fit tightly, the distance between the eleventh rotating roller 4.9 and the eighth rotating roller 4.5 is not too wide. Meanwhile, all the rotating rollers in the auxiliary rotating roller group are passively rotated, and the rotating damping is required to be as small as possible, so that the liquid film on the surface of the strip is prevented from being damaged when all the rotating rollers in the auxiliary rotating roller group are rotated. The twelfth rotating roller 4.10 at the third discharge hole 4.12 is used for preventing the strip with the liquid film from rubbing against the device wall when moving, so the highest point of the twelfth rotating roller 4.10 should be slightly higher than the lower edge of the third discharge hole 4.12. The coating device can adopt any one of spraying, brushing and dip-coating modes. When any one of the three coating modes is selected, the movement modes of the strip are that the strip enters from the third feeding port 4.1 at the lower part and exits from the third discharging port 4.12 at the upper part, and the difference is that the matching modes of the strip and each rotating roller are different. In other words, the movement of the strip in the different coating modes is also different. In the spraying operation as shown in fig. 12, the strip enters the device from the third feed opening 4.1, passes through the second spray head 4.2 to make the surface of the strip liquid, then passes under the eleventh rotating roller 4.9 and is attached to the coating belt 4.7, and the moving direction of the strip is opposite to the moving direction of the coating belt 4.7, so as to wipe off the excess coating on the back surface of the strip. In the case of the brush coating operation shown in fig. 13, the coating band 4.7 itself carries the liquid, and the web passes under the eleventh rotating roller 4.9 and is brought into contact with the coating band 4.7, and the web moves in the direction opposite to the direction in which the coating band 4.7 moves, so that the liquid is carried on the web. In the dip coating operation shown in fig. 14, the strip passes over the eleventh rotating roll 4.9 and is brought into contact with the coating band 4.7, the moving direction of the strip is the same as the moving direction of the coating band 4.7, and the strip passes below the liquid level to carry out the liquid-carrying treatment on the surface of the strip.

The material of each rotating roller in the coating device is preferably metal with corrosion resistance, such as stainless steel, titanium alloy, aluminum alloy and the like, and the diameters of the seventh rotating roller 4.4, the eighth rotating roller 4.5 and the ninth rotating roller 4.6 are preferably 50-80 mm, such as 50mm, 60mm, 70mm and 80 mm; the tenth turning roll 4.8, the eleventh turning roll 4.9 and the twelfth turning roll 4.10 preferably have a diameter of 30 to 50mm, for example 30mm, 40mm or 50 mm. The surface of the coating belt 4.7 is provided with an outer layer, and the material of the outer layer is at least one of materials which are easy to adhere to solution and are soft, such as rubber, cotton cloth, sponge and the like; a trough opening 4.13 is arranged at the bottom of the coating device 4, a pipeline is arranged at the trough opening 4.13 and comprises two conveying branches, wherein one conveying branch is connected with the insulating substance solution and used for supplementing the insulating substance solution required by coating in the coating device 4, and the other conveying branch is connected with a recovery tank and used for conveying the residual solution in the coating device 4 to the recovery tank. The second spray head 4.2 is preferably matched with an external filter and is used for preventing particles in the solution from blocking the spray head during continuous coating operation; the included angle between the direction of the air flow generated by the air knife and the strip is not more than 15 degrees, the damage of the air flow generated by the air knife to the liquid film is prevented, and the strip is further prevented from shaking. The air outlet width is mainly matched with the width of the strip, and is 5-100 mm, such as 15mm, 30mm, 50mm, 70mm and 100 mm; the air outlet length is 0.1-1 m, such as 0.1m, 0.2m, 0.4m, 0.7m, 0.8 m.

The thickness control device comprises a thirteenth rotating roller and a fourteenth rotating roller, and the diameter of the thirteenth rotating roller is the same as that of the fourteenth rotating roller; the distance between the thirteenth rotating roller and the fourteenth rotating roller is adjustable, and the distance between the thirteenth rotating roller and the fourteenth rotating roller is adjustable within 0-5 mm, such as 0.02mm, 0.025mm and 0.03 mm; meanwhile, the distance precision is controlled to be 0.005-0.01 mm, such as 0.005mm and 0.01 mm; the two rotating rollers are used for extruding excessive solution on the surface of the strip, the surface precision of the rotating rollers is controlled to be Ra0.05-Ra0.1 according to the national standard, such as Ra0.05 and Ra0.1, the problem that the solution thickness is not uniform due to the uneven roller surface is solved, the tangent plane of the rotating rollers and the discharge hole of the coating device are in the same horizontal plane, and the strip and equipment are prevented from being scraped unnecessarily. In addition, a solution recovery tank is arranged below the thickness control device; the recovery tank that thickness control device's below was equipped with required insulating material solution tank and the recovery jar of coating device and pass through pipeline and three way valve connection, the recovery solution that obtains after thickness control device handles should select to carry different places according to the purity requirement of coating process to insulating material solution, when the purity requirement to the insulating material solution of coating process is lower, can flow back to the coating jar with the recovery solution and carry out the recoating once more, when the purity requirement to the insulating material solution of coating process is higher, can collect in carrying special recovery jar with the recovery solution.

Fig. 15 is a left side view of the heating apparatus, and fig. 16 is a sectional view of fig. 15 taken along D-D. As shown in fig. 15-16, the heating device 6 includes a group of heating elements 6.3 for heating, a temperature control thermocouple and a support 6.2 are disposed in the heating device, an insulating layer and a sealing layer are mounted on the edge of the heating device, an air inlet and an air outlet for introducing a protective atmosphere are disposed behind the heating device, and a fourth feeding port 6.1 and a fourth discharging port 6.4 are disposed on two opposite side walls of the heating device respectively for feeding and discharging a strip;

the heating device is provided with a heat preservation layer, and the thickness of the heat preservation layer is preferably 50-100 mm, such as 80mm and 100 mm. The air inlet and the air outlet of the heating device are matched with an external air device, and the air speed is adjustable. The fourth feed inlet 6.1 and the fourth discharge outlet 6.4 of the heating device need to be provided with sealing rollers for preventing the protective atmosphere inside the device from being damaged, and for some coating occasions with low requirements, the sealing rollers can be omitted, and besides, the outside of the material ports positioned at two sides of the heating device is matched with an external ventilation device for timely recycling and post-treating gas products generated by some harmful curing reactions and overflowing from the material ports.

As shown in fig. 17, the pinch device 7 includes a seventeenth rotating roller 7.1 and an eighteenth rotating roller 7.2, the diameters of the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 are the same, the clamping force between the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 is adjustable, and the clamping force between the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 is 1 to 50N, such as 10N, 15N, 25N, 30N, 40N; the surface precision of the seventeenth rotating roller 7.1 and the eighteenth rotating roller 7.2 is controlled to Ra0.05-Ra0.2 according to the national standard, such as Ra0.05, Ra0.1 and Ra0.2, and the formed insulating layer is prevented from being damaged due to excessive surface roughness.

The tension control device 8 is composed of a tension sensor and a tension controller.

As shown in fig. 18 to 19, the insulation performance testing device 9 includes a fifteenth rotating roller 9.1, a rotating shaft 9.2, a sixteenth rotating roller 9.3; the diameters of the fifteenth rotating roller 9.1 and the sixteenth rotating roller 9.3 are 10-30 mm, such as 10mm, 20mm and 30 mm; the fifteenth rotating roller 9.1 and the sixteenth rotating roller 9.3 are capable of relative rotation.

The insulation performance testing device 9 can calculate the withstand voltage value and the resistance value according to the input and output voltage and current values, and can obtain the withstand voltage value and the resistance value. Besides, the fifteenth rotating roller 9.1 and the sixteenth rotating roller 9.3 can rotate relatively, the relative rotation being realized by the rotating shaft 9.2; simultaneously applying a certain torque to ensure the surface of the strip to be attached, wherein the torque is preferably 2-5 N.m, such as 2 N.m, 3 N.m, 4 N.m and 5 N.m; the too small torque affects the attaching effect, and the too large torque can damage the insulating layer. The device of the invention can realize real-time measurement of the performance of the insulating coating. Fig. 20 is a front view showing the insulation performance test of the insulation coating on the surface of the strip using the insulation performance testing apparatus.

As shown in fig. 21, the winding device 10 is composed of a pair of second fixtures 10.2 and second baffles 10.3 that can be fixed on the second rotating shaft 10.1, and the device clamps the inner lining of the strip material tray through the second fixtures 10.2, and simultaneously supports two sides of the strip material tray by the second baffles 10.3, so as to ensure that the two sides of the material tray are flush when winding.

Unreeling device 1 needs external magnetic powder stopper, guarantees to have certain micro-tension when unreeling the in-process realization and unreeling, avoids because the mechanical shake that appears in the continuous coating process leads to the strip to pile up.

The positions of the clamps and the baffle plates of the unwinding device 1 and the winding device 10 can be moved left and right on the rotating shaft, and the moving device can freely move through a sliding block, can also control the position through the rotation of a threaded pipe, and can also be pushed through hydraulic pressure, an air cylinder and other devices. The positions of the clamps of the unwinding device 1 and the winding device 10 on the rotating shaft are relatively adjustable to ensure that the strips move in the same vertical plane, and meanwhile, the winding device 10 needs to be connected with a magnetic powder clutch and forms a loop with the tension control device to jointly form a tension control system to ensure that the tension of the strips is stable in the winding process, so that the collected strip material trays are uniform and compact.

The coating device 4, the thickness control device 5 and the clamping and conveying device 7 are connected through a belt or a chain to realize synchronous rotation, so that the strip materials are prevented from being accumulated in the coating process due to uneven rotation speed.

The invention also provides a method for continuously coating the amorphous nanocrystalline strip with the insulating coating, which comprises the following steps:

(1) a cleaning step, wherein the surface of the amorphous nanocrystalline strip is cleaned, and the cleaning step is carried out in a cleaning device;

(2) a drying step, drying the cleaned amorphous nanocrystalline strip to remove the cleaning agent attached to the surface of the amorphous nanocrystalline strip, wherein the step is carried out in a drying device;

(3) coating, namely coating an insulating material solution on the surface of the amorphous nanocrystalline strip by a coating device; the coating mode comprises any one of spraying, dipping and brushing, and the coating step is used for forming solution adhesion on the surface of the strip; the coating step may be carried out under a protective atmosphere;

(4) a liquid film thickness control step, after the liquid film is attached to the strip material by the coating device, the strip material is subjected to homogenization treatment on the liquid film on the surface of the strip material by the thickness control device;

(5) surface drying and curing, namely, feeding the amorphous nanocrystalline strip coated with the insulating material liquid film after the step (4) into a heating device, and performing surface drying and curing treatment on the liquid film on the surface of the strip in the heating device to form an insulating coating on the liquid film attached to the surface of the strip;

The cleaning mode is at least one of spray cleaning, immersion cleaning and scrubbing by utilizing the outer layer of the surface of the second rotating roller 2.4; the cleaning agent is at least one of absolute ethyl alcohol, water, a sodium carbonate solution, a sodium metasilicate solution and a sodium citrate solution; the cleaning mode can be selected according to different cleaning agents, for some cleaning agents with low viscosity, the cleaning agents can be cleaned by spraying or soaking in the cleaning agents, for organic solvents with high viscosity, the cleaning agents can be soaked in the cleaning agents for cleaning, for some strips with high requirements on the surface cleaning degree and needing to be cleaned for multiple times, multiple cleaning tanks can be added, the cleaning modes can be used for cleaning in a way of being matched with each other, meanwhile, the cleaning time can be adjusted, and the cleaning time can be 10-30 s, such as 10s, 15s, 20s, 25s and 30 s; too short time is not beneficial to cleaning, and too long time affects production efficiency.

The temperature of the drying step is as follows: room temperature to 300 deg.C, e.g., 80 deg.C, 120 deg.C, 150 deg.C, 210 deg.C, 230 deg.C, 270 deg.C; the drying time can be realized by adjusting the passing distance and the passing speed of the strip in the drying device, the drying time can be adjusted, and the drying time can be 10-90 s, such as 10s, 20s, 40s, 70s, 75s, and 90 s.

The coating step is preferably carried out under a protective atmosphere, including but not limited to at least one atmosphere of nitrogen, argon, hydrogen and dry air (relative air humidity < 1%) (hereinafter referred to as dry air), the strip being subjected to a coating device for applying a liquid film on one or both surfaces thereof.

In the liquid film thickness control step, the gap between the thirteenth rotating roller and the fourteenth rotating roller in the thickness control device is adjusted, and the strip attached with the liquid film is controlled to pass through the device, and then redundant solution is extruded out of the surface of the strip to achieve uniform thickness.

The surface drying and curing step is preferably performed under a protective atmosphere including, but not limited to, at least one atmosphere of nitrogen, argon, hydrogen, and dry air (relative air humidity < 1%), wherein the temperature of the surface drying and curing process is 100-400 ℃, such as 150 ℃, 180 ℃, 250 ℃, 280 ℃, 340 ℃, 350 ℃; the surface drying and solidifying time is continuously adjustable by adjusting the conveying speed of the clamping and conveying device and the running mode of the strip in the heating device, and the surface drying and solidifying time is preferably 10-300 s, such as 30s, 45s, 90s, 120s, 150s, 240s and 270 s; for some solutions with longer curing reaction times, the process may be omitted by performing only the tack-free reaction, and the subsequent curing reaction may be performed in a dedicated curing oven.

The insulation performance test tests the resistance value and the withstand voltage value of the insulation coating on the surface of the strip, and the test ranges of 0-20M omega resistance value and 0-500V voltage are realized by changing input current and voltage.

The invention can use any one of the coating modes of brush coating, spray coating and dip coating, can control the liquid film attached to the surface of the strip, and simultaneously combines the thickness control device to extrude the redundant liquid on the surface of the strip, thereby ensuring the liquid quantity and further homogenizing the liquid film.

Example 1

The device and the method are utilized to carry out coating operation of amorphous strip MgO alcohol suspension (the alcohol suspension is prepared by adding magnesium oxide powder into alcohol), dust and other impurities stained on the surface of the strip are cleaned in a spray type cleaning mode, a cross section of the surface of the strip is cleaned by a first nozzle of a cleaning device is shown in figure 5, the diameter of a second rotating roller 2.4 of the cleaning device is 30mm, a cleaning agent is absolute ethyl alcohol, an atomizing nozzle is selected by a first nozzle 2.3, the atomizing pressure is selected to be 1MPa, the cleaning time is 10s, then the strip enters a drying device for drying, the arrangement mode of the strip is shown in figure 9, the drying temperature is 80 ℃, the drying time is 20s, then the strip enters a coating device, a brushing method shown in figure 13 is selected, the coating atmosphere is dry air, the diameter of a seventh rotating roller 4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6 is 50mm, the diameters of a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10 are 50mm, the outer layer of a coating belt 4.7 is made of sponge, the air outlet width is 30mm, the air outlet length is 0.2m, the phenomenon of inconsistent thickness of a liquid film can be seen on the surface of a strip material after being coated, therefore, the gap between the two rollers of a thickness control device is set to be 0.03mm, the distance precision is 0.01mm, the roller surface precision is in the Ra0.1 level, then the strip material enters a heating device to carry out surface drying and curing reaction, the protective atmosphere in the surface drying and curing step is selected to be hydrogen, the heat preservation layer of the heating device is 80mm, the surface drying and curing temperature is set to be 150 ℃, the surface drying and curing time is set to be 270s, the clamping force of the clamping device is set to be 10N, the roller surface precision is in the Ra0.2 level, meanwhile, the diameters of the two rollers of an insulating property testing device are selected to be 30mm, and the torque is 2 N.m, the voltage applied between the two rollers is not punctured when the voltage is 50V, the resistance value of the strip is 10-15 k omega, and the thicknesses of the strip before and after coating at 8 randomly selected points are shown in table 1.

TABLE 1

Thickness of the pre-coating tape (μm)	Thickness of coated tape (μm)
		24，23，23，24，23，24，22，24	27，28，28，26，28，29，28，26

As can be seen from Table 1, after coating, the thickness of the insulating coating on the surface of the strip material is 4-6 μm, and the thickness fluctuation range of the strip material with the insulating coating is close to that of the original strip material, which indicates that the thickness of the insulating coating is relatively uniform.

Example 2

The device and the method of the invention are used for coating the methyl silicone resin of the nanocrystalline strip, impurities on the surface of the strip are cleaned by a spray type cleaning mode, a cross section of the surface of the strip is cleaned by a first nozzle of the cleaning device is shown in figure 5, the diameter of a second rotating roller 2.4 of the cleaning device is 30mm, the cleaning agent is water, an atomizing nozzle is selected by the first nozzle 2.3, the atomizing pressure is 2.5MPa, the cleaning time is 20s, the strip enters a drying device for drying, the arrangement mode of the strip is shown in figure 9, the drying temperature is 150 ℃, the drying time is 40s, a dip coating method is adopted, the coating atmosphere is dry air, the diameter of a seventh rotating roller 4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6 is 70mm, the diameter of a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10 is 30mm, the outer layer of the coating strip is selected as shown in figure 14, cotton cloth 4.7, the gap between two rollers of a thickness control device is set to be 0.03mm, the distance precision is selected to be 0.01mm, the roller surface precision is selected to be Ra0.1 grade, then the roller enters a heating device to carry out surface drying and curing reaction, the protective atmosphere in the surface drying and curing step is selected to be dry air, the thickness of a heat insulation layer of the heating device is 80mm, the surface drying and curing temperature is set to be 250 ℃, the surface drying and curing time is set to be 150s, the clamping force of a clamping device is set to be 25N, the roller surface precision is selected to be Ra0.1 grade, meanwhile, the diameter of the two rollers of an insulating property testing device is 20mm, the torque is selected to be 3 N.m, the voltage applied between the two rollers is not punctured when the voltage is 100V, the resistance value of a strip is 100-120 kOmega, and the thickness of 15 points is randomly selected before and after coating as shown in Table 2.

TABLE 2

As can be seen from Table 2, after coating, the thickness of the insulating coating on the surface of the strip is 2-4 μm, and the thickness fluctuation range of the strip with the insulating coating is close to that of the original strip, which indicates that the thickness of the insulating coating is relatively uniform.

Example 3

The device and the method of the invention are used for coating the polysilazane solution of the nanocrystalline strip, the oil stain and other impurities on the surface of the strip are cleaned by an immersion cleaning mode, the section view of the strip immersed in the cleaning device for cleaning is shown in figure 6, the diameter of the second rotating roller 2.4 of the cleaning device is 50mm, the cleaning agent is sodium carbonate solution, the cleaning time is 30s, the strip enters a drying device for drying after cleaning, the arrangement mode of the strip is shown in figure 9, the drying temperature is 150 ℃, the drying time is 75s, the spraying method is adopted, the coating atmosphere is nitrogen, the diameter of the seventh rotating roller 4.4, the eighth rotating roller 4.5 and the ninth rotating roller 4.6 is 60mm, the diameter of the tenth rotating roller 4.8, the eleventh rotating roller 4.9 and the twelfth rotating roller 4.10 is 40mm, the outer layer of the coating strip 4.7 is selected from rubber, the air outlet width is selected from 50mm, the air outlet length is selected from 0.1m, the gap between two rollers of the thickness control device is set to be 0.025mm, the distance precision is selected to be 0.005mm, the roller surface precision is selected to be Ra0.05 grade, then the roller enters a heating device for surface drying and curing reaction, the protective atmosphere in the surface drying and curing step is nitrogen, the thickness of the heat insulation layer of the heating device is 100mm, the surface drying and curing temperature is set to be 340 ℃, the surface drying and curing time is set to be 90s, the clamping force of the clamping device is set to be 10N, the roller surface precision is selected to be Ra0.05 grade, meanwhile, the diameter of the two rollers of the insulation performance testing device is selected to be 30mm, the torque is selected to be 5 N.m, the voltage applied between the two rollers does not generate the breakdown phenomenon when the voltage is 200V, the resistance value of the strip is 300-350 k omega, the thickness values of the strip before and after coating are not obviously different through a micrometer, therefore, the thickness of the insulation coating on the surface of the strip is measured through a scanning electron microscope, and the result is shown in figure 22, the thickness of the coated insulating coating is 1-2 μm.

Example 4

The device and the method provided by the invention are utilized to carry out coating operation of the nanocrystalline strip silica sol, oil stain and other impurities stained on the surface of the strip are cleaned in a spray type cleaning mode, the section view of the surface of the strip is cleaned by a first spray head of the cleaning device is shown in figure 5, the diameter of a second rotating roller 2.4 of the cleaning device is 40mm, a cleaning agent is selected from sodium metasilicate solution, an atomizing spray head is selected from a first spray head 2.3, the atomizing pressure is selected from 1.5MPa, the cleaning time is 15s, the strip enters a drying device for drying, the arrangement mode of the strip is shown in figure 9, the drying temperature is selected from 270 ℃, the drying time is 70s, the brushing method is selected from figure 13, the coating atmosphere is dry air, the diameters of a seventh rotating roller 4.4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6 are 70mm, the diameters of a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10 are selected from 40mm, selecting sponge as the outer layer of a coating belt 4.7, selecting 70mm of air outlet width, selecting 0.4m of air outlet length, setting the gap between two rollers of a thickness control device to be 0.02mm, selecting 0.01mm of distance precision, selecting Ra0.05 grade of roller surface precision, then entering a heating device for surface drying and curing reaction, selecting dry air as protective atmosphere in the surface drying and curing step, setting the thickness of a heat insulation layer of the heating device to be 100mm, setting the surface drying and curing temperature to be 280 ℃, setting the surface drying and curing time to be 120s, setting the clamping force of a clamping device to be 15N, selecting Ra0.05 grade of roller surface precision, meanwhile, the diameter of two rollers of the insulation performance testing device is selected to be 10mm, the torque is selected to be 4 N.m, the breakdown phenomenon does not occur when the voltage applied between the two rollers is 100V, the resistance value of the strip is 500-1000 k omega, the limit breakdown voltage value of the strip measured later is shown in table 3, and the thickness of the insulation coating coated by the method is measured to be 1-2 mu m.

TABLE 3

As shown in Table 3, the breakdown voltages of the two samples are greater than 100V, and the individual points even reach 200V, which indicates that the insulating coating applied in this way has a more desirable breakdown resistance.

Example 5

The device and the method provided by the invention are utilized to carry out the coating operation of the nano-crystalline strip material nano-alumina ethanol suspension, the oil stain and other impurities stained on the surface of the strip material are cleaned by an immersion cleaning mode, the section view of the strip material immersed in the cleaning device for cleaning is shown in figure 6, the diameter of the second rotating roller 2.4 of the cleaning device is 50mm, the cleaning agent is absolute ethyl alcohol, the cleaning time is 20s, the strip material enters a drying device for drying after cleaning, the arrangement mode of the strip material is shown in figure 9, the drying temperature is 120 ℃, the drying time is 90s, the dip coating method is adopted, the coating atmosphere is dry air, the diameter of the seventh rotating roller 4.4, the eighth rotating roller 4.5 and the ninth rotating roller 4.6 is 80mm, the diameter of the tenth rotating roller 4.8, the eleventh rotating roller 4.9 and the twelfth rotating roller 4.10 is 30mm, the outer layer of the coating strip material is selected as cotton cloth 4.7, the air outlet width is selected to be 15mm, the air outlet length is selected to be 0.7m, the gap between two rollers of a thickness control device is set to be 0.03mm, the distance precision is selected to be 0.01mm, the roller surface precision is selected to be Ra0.1 grade, then the roller enters a heating device to carry out surface drying and curing reaction, the protective atmosphere in the surface drying and curing step is selected to be dry air, the thickness of a heat insulation layer of the heating device is 100mm, the surface drying and curing temperature is set to be 350 ℃, the surface drying and curing time is set to be 45s, the clamping force of a clamping device is set to be 40N, the roller surface precision is selected to be Ra0.2 grade, meanwhile, the diameter of the two rollers of an insulation performance testing device is selected to be 20mm, the torque is selected to be 3 N.m, no strip breakdown phenomenon occurs when the voltage applied between the two rollers is 125V, the resistance value is 200-500 k omega, and the thicknesses of 8 points are randomly selected as shown in Table 4 before and after coating.

TABLE 4

As can be seen from Table 4, after coating, the thickness of the insulating coating on the surface of the strip material is 2-4 μm, the thickness fluctuation range of the strip material with the insulating coating is slightly larger than that of the original strip material, and the stirring device is required to be configured to ensure the uniformity and stability of the coating in consideration of the fact that the dispersion degree of the suspension liquid changes in the continuous coating process.

Example 6

The device and the method of the invention are used for coating amorphous strip silicone resin, impurities on the surface of the strip are cleaned by a spray type cleaning mode, a cross section of the surface of the strip is cleaned by a first nozzle of the cleaning device is shown in figure 5, the diameter of a second rotating roller 2.4 of the cleaning device is 40mm, cleaning agent is water, an atomizing nozzle is selected by the first nozzle 2.3, atomizing pressure is 3MPa, cleaning time is 25s, the strip enters a drying device for drying, the arrangement mode of the strip is shown in figure 9, drying temperature is 230 ℃, drying time is 10s, a dip coating method is adopted, the coating atmosphere is hydrogen, the diameter of a seventh rotating roller 4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6 is 60mm, the diameter of a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10 is 50mm, the outer layer of the coating strip is selected as shown in figure 14, the gap between two rollers of a thickness control device is set to be 0.03mm, the distance precision is selected to be 0.01mm, the roller surface precision is selected to be Ra0.05 grade, then the roller enters a heating device to carry out surface drying and curing reaction, the protective atmosphere in the surface drying and curing step is selected to be hydrogen, the thickness of a heat preservation layer of the heating device is 80mm, the surface drying and curing temperature is set to be 180 ℃, the surface drying and curing time is set to be 240s, the clamping force of a clamping and conveying device is set to be 30N, the roller surface precision is selected to be Ra0.1 grade, meanwhile, the diameter of the two rollers of an insulating property testing device is selected to be 10mm, the torque is selected to be 3 N.m, the voltage applied between the two rollers is not punctured when the voltage is 150V, the resistance value of a strip is 200-250 k omega, and the thickness of 8 points of the strip before and after coating is randomly selected as shown in Table 5.

TABLE 5

As can be seen from Table 5, after coating, the thickness of the insulating coating on the surface of the strip material is 2-4 μm, and the thickness fluctuation range of the strip material with the insulating coating is close to that of the original strip material, which indicates that the thickness of the insulating coating is relatively uniform.

Example 7

The device and the method are utilized to carry out the coating operation of the modified silica sol of the nanocrystalline strip, oil stains and other impurities stained on the surface of the strip are cleaned in a spray type cleaning mode, the section view of the surface of the strip is cleaned by a first spray head of the cleaning device is shown in figure 5, the diameter of a second rotating roller 2.4 of the cleaning device is 30mm, a sodium citrate solution is selected as a cleaning agent, an atomizing spray head is selected as a first spray head 2.3, the atomizing pressure is selected to be 1MPa, the cleaning time is 30s, the strip enters a drying device to be dried, the strip is arranged in a mode shown in figure 9, the drying temperature is selected to be 210 ℃, the drying time is 90s, a brushing method shown in figure 13 is selected, the coating atmosphere is argon, the diameters of a seventh rotating roller 4.4.4, an eighth rotating roller 4.5 and a ninth rotating roller 4.6 are 60mm, the diameters of a tenth rotating roller 4.8, an eleventh rotating roller 4.9 and a twelfth rotating roller 4.10 are selected to be 40mm, selecting sponge as the outer layer of the coating belt 4.7, selecting 100mm air outlet width, selecting 0.8m air outlet length, setting the gap between two rollers of a thickness control device to be 0.03mm, selecting 0.01mm distance precision, selecting Ra0.1 grade as roller surface precision, then entering a heating device for surface drying and curing reaction, selecting argon as protective atmosphere in the surface drying and curing step, setting the thickness of a heat insulation layer of the heating device to be 100mm, setting the surface drying and curing temperature to be 350 ℃, setting the surface drying and curing time to be 30s, setting the clamping force of a clamping device to be 40N, selecting Ra0.2 grade as roller surface precision, selecting the diameter of the two rollers of an insulation performance testing device to be 20mm, selecting 5 N.m torque, applying voltage between the two rollers without breakdown phenomenon at 300V, measuring the breakdown voltage value with 500V input voltage value as shown in Table 6, wherein part of points are not broken down and the voltage value is high, the resistance value of the strip is 1-10 MOmega, and the thickness of the insulating coating coated by the method is measured to be 2-3 mu M.

TABLE 6

Test point	1	2	3	4	5
						Breakdown voltage	500	500	422	467	500

As can be seen from Table 6, the breakdown voltage after coating is high, and the thickness of the insulating coating is 2-3 μm, so that the coating mode is suitable for coating the nanocrystalline strip modified silica sol, the insulating property is ensured to be good, the thickness control of the insulating coating is also ideal, and the coating mode is suitable for continuous coating operation.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for continuously applying an insulating coating to an amorphous nanocrystalline ribbon, the apparatus comprising: the device comprises a cleaning device (2), a drying device (3), a coating device (4), a thickness control device (5), a heating device (6) and an insulation performance testing device (9);

the cleaning device (2) is used for cleaning the surface of the amorphous nanocrystalline strip;

the drying device (3) is used for drying the cleaned amorphous nanocrystalline strips;

the coating device (4) is used for coating an insulating material solution on the surface of the dried amorphous nanocrystalline strip;

the thickness control device (5) is used for carrying out homogenization treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip;

the heating device (6) is used for carrying out surface drying and curing treatment on the insulating material solution film on the surface of the amorphous nanocrystalline strip to form an insulating coating;

the insulation performance testing device (9) is used for testing the insulation performance of the insulation coating formed on the surface of the amorphous nanocrystalline strip.

2. The apparatus for continuously coating amorphous nanocrystalline strip with an insulating coating according to claim 1, characterized in that the apparatus further comprises an unwinding device (1), a pinch device (7), a tension control device (8), and a winding device (10);

the unwinding device (1) is used for conveying the amorphous nanocrystalline strip to the cleaning device (2);

the clamping and conveying device (7) is used for conveying the amorphous nanocrystalline strip coated with the insulating coating and output by the heating device (6) to the tension control device (8);

the tension control device (8) is used for controlling the tension of the amorphous nanocrystalline strip coated with the insulating coating, so that the tightness degree of a material tray of the winding device (10) is consistent;

the winding device (10) is used for winding the strip transmitted from the insulation performance testing device (9).

3. The apparatus for continuously coating amorphous nanocrystalline strips with an insulating coating according to claim 2, characterized in that the cleaning device (2) is arranged behind the unwinding device (1); the drying device (3) is arranged behind the cleaning device (2); the coating device (4) is arranged behind the drying device (3); the thickness control device (5) is arranged behind the coating device (4); the heating device (6) is arranged behind the thickness control device (5); the clamping and conveying device (7) is arranged behind the heating device (6); the tension control device (8) is arranged behind the clamping and conveying device (7); the insulation performance testing device (9) is arranged behind the tension control device (8); the winding device (10) is arranged behind the insulation performance testing device (9).

4. The apparatus for the continuous coating of amorphous nanocrystalline ribbon according to claim 1, characterized in that the cleaning device (2) comprises a first rotating roller (2.2), a second rotating roller (2.4), a third rotating roller (2.5), the first rotating roller (2.2) and the third rotating roller (2.5) being respectively arranged on both sides of the second rotating roller (2.4);

the first rotating roller (2.2) and the third rotating roller (2.5) have the same axle center height;

the height of the second rotating roller (2.4) is lower than the height of the first rotating roller (2.2) and the third rotating roller (2.5);

the top of the cleaning device is provided with a first spray head (2.3);

a first feed inlet (2.1) and a first discharge outlet (2.6) are respectively arranged on two opposite side walls of the cleaning device;

the diameter of the second rotating roller (2.4) is 30-50 mm;

the first rotating roller (2.2), the second rotating roller (2.4) and the third rotating roller (2.5) are all made of metal with corrosion resistance.

5. The apparatus for the continuous coating of amorphous nanocrystalline ribbon according to claim 1, characterized in that the drying device (3) is equipped with a heat-insulating interlayer;

the drying device (3) comprises a fourth rotating roller (3.3), a fifth rotating roller (3.5) and a sixth rotating roller (3.6); the fourth rotating roller (3.3), the fifth rotating roller (3.5) and the sixth rotating roller (3.6) are arranged in a triangular shape;

the fifth rotating roller (3.5) is positioned above the fourth rotating roller (3.3) and the sixth rotating roller (3.6), and the fifth rotating roller (3.5) can move up and down; the fourth rotating roller (3.3) and the sixth rotating roller (3.6) are the same in height;

the top and the bottom of the drying device are respectively provided with a hot air outlet (3.4) and a hot air inlet (3.1);

a second feeding hole (3.2) and a second discharging hole (3.7) are respectively arranged on two opposite side walls of the drying device; the second feeding hole (3.2) and the second discharging hole (3.7) are same in height.

6. The apparatus for the continuous application of insulating coatings to amorphous nanocrystalline strips according to any of claims 1 to 5, characterized in that the coating device (4) comprises a main set of rotating rollers, a coating belt (4.7), an auxiliary set of rotating rollers;

the coating belt (4.7) is wrapped on the main rotating roller group; the outer layer of the coating belt (4.7) is made of rubber, cotton cloth or sponge;

the main rotating roller group comprises a seventh rotating roller (4.4), an eighth rotating roller (4.5) and a ninth rotating roller (4.6); the diameters of the seventh rotating roller (4.4), the eighth rotating roller (4.5) and the ninth rotating roller (4.6) are 50-80 mm;

the auxiliary rotating roller group comprises a tenth rotating roller (4.8), an eleventh rotating roller (4.9) and a twelfth rotating roller (4.10);

the seventh rotating roller (4.4), the eighth rotating roller (4.5), the ninth rotating roller (4.6), the tenth rotating roller (4.8), the eleventh rotating roller (4.9) and the twelfth rotating roller (4.10) are arranged in parallel;

the diameters of the tenth rotating roller (4.8), the eleventh rotating roller (4.9) and the twelfth rotating roller (4.10) are 30-50 mm;

a third feeding port (4.1) and a third discharging port (4.12) are arranged on the side wall of the coating device;

a second spray head (4.2) is arranged on the coating device;

and an air knife (4.3) is arranged on the side wall of the coating device.

7. The apparatus according to claim 6, wherein the thickness control means comprises a thirteenth rotating roller, a fourteenth rotating roller;

and a solution recovery tank is arranged below the thickness control device.

8. The apparatus for the continuous application of insulating coatings to amorphous nanocrystalline strips according to claim 7, characterized in that the heating means (6) comprise a heating element (6.3);

the heating device is provided with a temperature control thermocouple and a bracket (6.2);

the heating device is provided with an air inlet and an air outlet;

and a fourth feeding hole (6.1) and a fourth discharging hole (6.4) are respectively formed in the two opposite side walls of the heating device.

9. The apparatus for the continuous coating of amorphous nanocrystalline ribbon according to claim 1, characterized in that the insulation performance test device (9) comprises a fifteenth rotating roller (9.1), a sixteenth rotating roller (9.3); the diameters of the fifteenth rotating roller (9.1) and the sixteenth rotating roller (9.3) are 10-30 mm;

the fifteenth rotating roller (9.1) and the sixteenth rotating roller (9.3) can rotate relatively.

10. The apparatus for continuously coating amorphous nanocrystalline strip with an insulating coating according to claim 2, characterized in that the unwinding device (1) comprises a first fixture (1.2), a first rotating shaft (1.1) and a first baffle (1.3); the first fixture (1.2) is fixed on the first rotating shaft (1.1); the first fixture (1.2) is used for fixing the lining of the strip material tray; the first baffle (1.3) is used for supporting two sides of a material disc of the strip material;

the pinch device (7) comprises a seventeenth rotating roller (7.1) and an eighteenth rotating roller (7.2), and the diameters of the seventeenth rotating roller (7.1) and the eighteenth rotating roller (7.2) are the same; the clamping force between the seventeenth rotating roller (7.1) and the eighteenth rotating roller (7.2) can be adjusted; the clamping force between the seventeenth rotating roller (7.1) and the eighteenth rotating roller (7.2) is 1-50N;

the tension control device comprises a tension sensor and a tension controller;

the winding device (10) comprises a second rotating shaft (10.1), a second fixture (10.2) and a second baffle (10.3); the second clamp (10.2) is used for clamping the lining of the strip disc; the second baffle (10.3) is used for supporting two sides of the material disc of the strip material.

11. A method for continuously coating an insulating coating on an amorphous nanocrystalline strip, characterized by comprising the following steps:

12. The method for continuously coating the insulating coating on the amorphous nanocrystalline strip according to claim 11, wherein in the cleaning step, the cleaning mode is at least one of spray cleaning, immersion cleaning and scrubbing by using an outer layer of the surface of the second rotating roller;

13. The method for continuously coating an insulating coating on an amorphous nanocrystalline strip according to claim 11 or claim 12, characterized in that the liquid film thickness control step is specifically: adjusting the gap between the rotating rollers of the thickness control device, wherein the strip attached with the liquid film passes through the thickness control device, and the redundant solution is extruded out of the surface of the strip to achieve uniform thickness;