CN104588757A - Knife disk mechanism and method for three-dimensional enhanced fin heat exchange tube plough machining - Google Patents

Abstract

The invention discloses a cutter head mechanism and method for plowing processing of three-dimensional reinforced finned heat exchange tubes. The cutter head mechanism includes a push plate, a cutter head assembly, and a cutter head casing arranged in sequence, and the outer wall of the push disk and the inner wall of the cutter head casing Connected; along the axial direction of the push plate, the outer wall of the push plate is provided with a plurality of inclined slideway grooves, and pin holes are opened on the position corresponding to each slideway groove on the outer casing of the cutter head, and each pin hole The guide pin is connected with the corresponding slideway groove, and when the push plate moves, the guide pin slides along the slideway groove; the inner wall of the push plate has a taper. The method is that when the external push rod pushes the push plate to move forward, the taper of the inner wall of the push plate enables the cutter head assembly to plow the copper tube axially; at the same time, when the push plate moves forward, the guide pin moves along the outer wall of the push plate. The inclined chute groove slides, driving the push plate to perform a helical motion, thereby driving the cutter head assembly to radially plow the copper pipe. The invention realizes one-time processing of the three-dimensionally strengthened finned heat exchange tubes, ensures the processing accuracy and improves the processing efficiency.

Description

Cutterhead Mechanism and Method for Plowing Processing of Three-dimensional Strengthened Finned Heat Exchange Tubes

technical field

The invention relates to the field of heat exchange tube processing equipment, in particular to a cutter head mechanism and method for plowing processing of three-dimensionally reinforced finned heat exchange tubes.

Background technique

Due to the characteristics of increasing the heat dissipation area of the heat exchange tube and better heat transfer effect, the reinforced fin heat exchange tube has been widely used in the field of heat exchangers in recent years. However, with the improvement of people's living standards, the requirements for energy saving are getting higher and higher. The energy-saving effect of the three-dimensional enhanced finned heat exchange tube is significantly higher than that of the two-dimensional enhanced finned heat exchange tube. Therefore, its application will become more and more extensive.

But at present, for the three-dimensional enhanced fin heat exchange tube, the processing method is to process the two-dimensional enhanced fin heat exchange tube first, and then process each fin on the enhanced fin heat exchange tube into a three-dimensional shape one by one. , the processing efficiency is very low, the processing difficulty is also very large, the production cost is high, and it is difficult to meet the market demand. The invention patent with the patent number ZL201010542572.4 discloses an enhanced finned heat exchange tube machining cutter head mechanism and its operation method. The cutter head mechanism has high processing efficiency and high processing accuracy, but it can only be applied to two-dimensional The processing of shape-enhanced finned heat exchange tubes is still not applicable to the processing of three-dimensional shape-enhanced finned heat exchange tubes.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a three-dimensional reinforced finned heat exchange tube plowing cutter head mechanism with simple structure and high processing efficiency.

Another object of the present invention is to provide a three-dimensional reinforced finned heat exchange tube plowing processing method realized by the above-mentioned cutterhead mechanism, which can form a three-dimensional reinforced finned heat exchange tube at one time, on the premise of ensuring the processing accuracy , effectively improve the processing efficiency.

The technical solution of the present invention is: a cutter head mechanism for plowing processing of three-dimensional reinforced fin heat exchange tubes, including a push plate, a cutter head assembly, and a cutter head jacket. The outer wall of the cutter head is arranged in sequence, and the outer wall of the push plate is connected with the inner wall of the outer cover of the cutter head; along the axial direction of the push plate, a plurality of inclined slideway grooves are arranged on the outer wall of the pusher plate, and the outer wall of the cutter head is connected with each slideway. There are pin holes at the positions corresponding to the grooves, and each pin hole is connected with the corresponding slideway grooves through guide pins. When the push plate moves, the guide pins slide along the slideway grooves; the inner wall of the push plate has a taper.

On the push plate, the inclination of each slideway groove relative to the axial direction of the push plate is 10-38°, that is, the angle between the center line of the slideway groove and the axis of the push plate is 10-38°. According to the general requirements for the angle of the three-dimensional reinforced fins on the heat exchange tube, the three-dimensional effect of the fins cannot meet the requirements because the inclination is too small, and the self-locking phenomenon will occur when the inclination is too large, so the inclination needs to be between 10 and 38 Take a value in the range of °.

As a preferred solution, the inclination of each slideway groove with respect to the axial direction of the push plate is 18°, and it is proved by experiments that this angle is the best value.

On the push plate, the axial length of each slideway groove is greater than the axial distance that the push plate moves.

The inner wall of the push plate has a taper of 10-30°, and the thickness of the inner wall of the push plate decreases gradually according to the conveying direction of the copper pipe.

There is also an end cover on the outside of the push plate, and the outer peripheral edge of the end cover is connected with one end surface of the cutter head outer cover; the middle part of the end cover has an inner convex cylinder, and the outer wall of the inner convex cylinder is formed between the inner wall of the cutter head outer cover. The cavity, push plate and cutter head assembly are located in the cavity.

The outer circumference of the inner convex cylinder is provided with a shaft sleeve, and the push plate is sleeved on the outer circumference of the shaft sleeve;

The middle part of the push plate is the cutter head groove, and the inner wall of the push plate is the side wall of the cutter head groove. There is a stepped hole on the push plate, and the first return spring and the first bolt are arranged in the step hole, and the first return spring is sleeved on the first bolt. On the top, the push plate is connected with the cutter head assembly through the first bolt.

The cutter head assembly includes a cutter head, a slider, a support sleeve and a planer, the support sleeve is sleeved on the outer periphery of the shaft sleeve, the cutter head is sleeved on the support sleeve, the cutter head is connected with the push plate through a first return spring and a first bolt, and the cutter head Connect with the support sleeve through the second bolt;

There are multiple slider grooves on the cutterhead, each slider groove corresponds to a slider, and each slider is installed with a planer; when the pusher moves, along the radial direction of the cutterhead, the sliders are aligned with the corresponding sliders. Sliding in the groove; there is a second spring at the junction of each slider and the support sleeve;

A third return spring is provided on the contacting surface of the cutter head jacket and the cutter head.

When the cutter head mechanism with the above structure is used, the principle is: the end cover is fixedly connected with the outer cover of the cutter head, and the support sleeve and the end cover adopt a transition fit; the push plate and the cutter head can slide axially on the support sleeve; The T-shaped groove (that is, the slider groove) of the cutter head slides in the radial direction; under the action of an external force, the push plate overcomes the resistance of the first return spring and moves in the axial direction, and pushes the slider to overcome the resistance of the second return spring in the radial direction. Sliding, the slider slides toward the center with the planer and cuts into the surface of the heat exchange tube. After that, the push plate contacts the cutter head to push the cutter head forward to plow up the fins. At the same time, the guide pin fixed on the outer cover of the cutter head is inserted into the push plate In the slideway groove of the push plate, there is an inclination between the direction of the slideway groove of the push plate and the movement direction of the push plate, which drives the push plate to rotate when it advances, forming a spiral motion, realizing three-dimensional motion, and completing the plow of three-dimensional fins. processing.

The present invention realizes a three-dimensional enhanced finned heat exchange tube plowing processing method through the above-mentioned cutter head mechanism. When the externally connected push rod pushes the push plate to move forward, the taper of the inner wall of the push plate makes the cutter head assembly carry out axial plowing on the copper tube. At the same time, when the push plate moves forward, the guide pin slides along the inclined slideway groove on the outer wall of the push plate, driving the push plate to perform a spiral movement, thereby driving the cutter head assembly to plow the copper pipe radially.

When the cutter head assembly performs axial plowing on the copper pipe, the specific process is as follows: when the push plate moves forward, the first return spring is compressed, and the taper of the push plate makes each slider on the cutter head move towards the center of the cutter head. Sliding, thereby driving the planer to cut into the outer wall of the copper tube, at this time the second return spring is also compressed; when the push plate continues to move forward, the planer also moves forward, and the depth of cutting into the outer wall of the copper tube is gradually increased; therefore, the processing is completed Finally, the thickness of the root of the fin is greater than the thickness of the tail of the fin.

When the cutter head assembly performs radial plowing on the copper pipe, the specific process is: when the push plate moves forward, the guide pin slides along the slideway groove. Since the slideway groove is set obliquely, the guide pin drives the outer cover of the cutterhead to plow. Simultaneously with the axial sliding, the push plate also performs a spiral motion, and the spiral motion of the push plate drives the entire cutter head assembly to perform a corresponding spiral motion, at this time the third return spring is compressed;

The cutter head assembly performs axial plowing and radial plowing on the copper tube at the same time, realizing the one-time processing of three-dimensional reinforced finned heat exchange tubes;

After the processing is completed, the entire cutter head mechanism is reset by the action of the first return spring, the second return spring and the third return spring; the conveying mode of the copper pipe is intermittent.

Compared with the prior art, the present invention has the following beneficial effects:

The cutter head mechanism and method of the three-dimensional enhanced fin heat exchange tube plowing processing are improved on the basis of the existing two-dimensional enhanced fin heat exchange tube plowing processing cutter head mechanism, and an inclined slideway is set on the push plate The slots and corresponding guide pins enable the cutter head assembly to perform helical movement while realizing axial movement, thereby realizing one-time processing of three-dimensional reinforced finned heat exchange tubes. Its structure is simple, but it can replace the traditional processing method of three-dimensional reinforced finned heat exchange tubes, effectively overcome the problems of high processing difficulty and low processing efficiency in traditional processing methods, and effectively improve the processing accuracy of three-dimensional reinforced finned heat exchange tubes on the basis of ensuring processing accuracy. The processing efficiency of the heat pipe and the reduction of production cost are conducive to meeting the market demand of the three-dimensionally reinforced finned heat exchange tube.

The cutter head mechanism of the three-dimensional enhanced finned heat exchange tube plowing process has a high degree of automation, which can realize the function of plowing multiple fins at the same time, and can also realize continuous operation; The root of the slice is thicker, not easy to fall off, and the product quality can be guaranteed.

Description of drawings

Fig. 1 is a structural schematic diagram of the cutter head mechanism.

Fig. 2 is a view along the line A-A of Fig. 1 .

Figure 3 is a schematic structural view of the push plate.

Fig. 4 is a partial view taken along direction B in Fig. 3 .

Fig. 5 is a C-C arrow view of Fig. 3 .

Fig. 6 is a schematic structural view of the cutter head.

Fig. 7 is a partial view along the line D-D of Fig. 6 .

Fig. 8 is a schematic structural view of the cutterhead casing.

Fig. 9 is a view from the E-E direction of Fig. 8 .

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

In this embodiment, a cutter head mechanism for plowing processing of three-dimensional reinforced finned heat exchange tubes, as shown in Figure 1 or Figure 2, includes a push plate 1, a cutter head assembly and a cutter head jacket 2, according to the conveying direction of the copper tube 3 (As shown by the arrow in Figure 2), the push plate, the cutter head assembly and the cutter head cover are arranged in sequence, and the outer wall of the push plate is connected with the inner wall of the cutter head cover; as shown in Figures 3 to 5, along the In the axial direction, the outer wall of the push plate is provided with a plurality of inclined slideway grooves 4, as shown in Fig. 8 and Fig. 9, pin holes 5 are provided on the position corresponding to each slideway groove on the cutter head outer cover, and each The pin holes are connected with corresponding slideway grooves by guide pins 6 (as shown in Figure 2), and when the push plate moved, the guide pins slid along the slideway grooves; the inner wall of the push plate has a taper.

In this embodiment, the inclination of each slideway groove on the push plate relative to the axial direction of the push plate is 18°, as shown in Figure 4, that is, the angle a between the centerline of the slideway groove and the axis of the push plate is 18° .

The axial length of each slideway groove is slightly greater than the axial distance of the push plate moving. As shown in Figure 4, the slideway groove is a long hole-shaped groove body, the radius R of the semicircle at both ends of the slideway groove is 5.7mm, and the horizontal distance between the centers of the semicircle at both ends of the slideway groove is 3.2mm, and the vertical distance is 3.2mm. 10mm.

The depth h of the slide groove is 12 mm (as shown in Figure 5).

As shown in FIG. 5 , the taper b on the inner wall of the push plate is 10°, and the wall thickness of the inner wall of the push plate gradually decreases according to the conveying direction of the copper pipe.

As shown in Figure 2, an end cover 7 is also provided on the outside of the push plate, and the outer peripheral edge of the end cover is connected with an end surface of the cutter head jacket; A cavity is formed between the inner walls, and the push plate and the cutter head assembly are located in the cavity.

The outer circumference of the inner convex cylinder is provided with a shaft sleeve 8, and the push plate is sleeved on the outer circumference of the shaft sleeve;

The middle part of the push plate 1 is the cutter head groove, the inner wall of the push plate is the side wall of the cutter head groove, the push plate is provided with a stepped hole, and the first return spring 9 and the first bolt 10 are arranged in the step hole, and the first return spring sleeve On the first bolt, the push plate is connected with the cutter head assembly through the first bolt.

The cutter head assembly includes a cutter head 11, a slider 12, a support sleeve 13 and a planer 14, the support sleeve is placed on the outer periphery of the shaft sleeve, the cutter head is placed on the support sleeve, the cutter head is connected with the push plate through the first return spring and the first bolt, The cutter head is connected with the supporting sleeve through the second bolt 15;

As shown in Figure 6 or Figure 7, the cutter head 11 is provided with a plurality of T-shaped slider grooves 16, and each slider groove is correspondingly equipped with a slider, and a planer is installed on each slider; when the push plate moves, Along the radial direction of the cutter head, the slider slides in the corresponding slider groove; as shown in Figure 2, a second spring 17 is provided at the junction of each slider and the support sleeve;

A third return spring 18 is provided on the contacting surface of the cutter head outer shell and the cutter head.

The gap between the push plate and the cutter head is 2mm. After the processing is completed, the first return spring is used for the return of the push plate, the second return spring is used for the reset of the slider and the planer, and the third spring is used for the reset of the cutter head assembly.

When the cutter head mechanism with the above structure is used, the principle is: the end cover is fixedly connected with the outer cover of the cutter head, and the support sleeve and the end cover adopt a transition fit; the push plate and the cutter head can slide axially on the support sleeve; The T-shaped groove (that is, the slider groove) of the cutter head slides in the radial direction; under the action of an external force, the push plate overcomes the resistance of the first return spring and moves in the axial direction, and pushes the slider to overcome the resistance of the second return spring in the radial direction. Sliding, the slider slides toward the center with the planer and cuts into the surface of the heat exchange tube. After that, the push plate contacts the cutter head to push the cutter head forward to plow up the fins. At the same time, the guide pin fixed on the outer cover of the cutter head is inserted into the push plate In the slideway groove of the push plate, there is an inclination between the direction of the slideway groove of the push plate and the movement direction of the push plate, which drives the push plate to rotate when it advances, forming a spiral motion, realizing three-dimensional motion, and completing the plow of three-dimensional fins. processing.

In this embodiment, a three-dimensional reinforced finned heat exchange tube plowing processing method can be realized through the above-mentioned cutter head mechanism. After the hole passes through the end cover, push the push plate), the taper of the inner wall of the push plate enables the cutter head assembly to plow the copper tube axially; at the same time, when the push plate moves forward, the guide pin slides along the inclined slide on the outer wall of the push plate The groove slides to drive the push plate to perform a spiral motion, thereby driving the cutter head assembly to plow the copper pipe radially. Its specific process includes the following steps:

(1) The push rod of an intermittent motion mechanism passes through the through hole on the end cover 7 (there are 2 through holes, which are respectively round holes with a diameter of 40 mm) to push the push plate 1, and there is a slideway groove on the push plate, The direction of the slideway groove and the moving direction of the push plate form an included angle of 18°, and the guide pin 6 fixed on the outer casing of the cutter head is inserted into the slideway groove to drive the push plate to rotate when it advances, generating a spiral motion, and the cutter head The end face through hole 19 on the overcoat is milled 1.83° (as shown in the angle c in Fig. 1 ) along the circumferential direction to form a long groove (as shown in Fig. 8 ) to meet the needs of the helical movement of the push plate; Its corresponding hexagon socket bolt has applied pretightening force, and this force is greater than the sum of the elastic force that the first return spring and the inner wall of the push plate push the slider 12 to overcome the second return spring; the distance between the push plate and the cutter head is 2mm, so The push plate moves 2mm axially along the shaft sleeve, so that the slider can be inserted radially into the pipe wall to a depth of about 0.2-0.3mm. At this time, the surface of the push plate is in contact with the surface of the cutter head, and it is pushed to overcome the elastic force of the third return spring. Moving axially along the shaft sleeve, the planer 14 helically plows a three-dimensional fin with a thickness of about 0.2mm, and the height of the fin is about 2.6mm; because the planer cuts in gradually, the thickness of the fin increases gradually, and the root is thicker ;

(2) Due to the intermittent movement of the push rod, the push rod moves backward at this time. Under the joint action of the first return spring, the second return spring and the third return spring, the cutter head retreats, and the slider also withdraws from the tube wall, and the push plate It also returns to the starting position and waits for the next cycle.

As mentioned above, the present invention can be better realized. The above-mentioned embodiment is only a preferred embodiment of the present invention, and is not used to limit the scope of the present invention; Covered by the scope of protection required by the claims of the present invention.

Claims (10)

1. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing, it is characterized in that, comprise push-plate, cutter head assembly and cutterhead overcoat, according to the throughput direction of copper pipe, push-plate, cutter head assembly and cutterhead overcoat set gradually, and the outer wall of push-plate connects with the inwall of cutterhead overcoat; Along the axis direction of push-plate, the outer wall of push-plate is provided with the slide groove of multiple inclination, puts on the position corresponding with each slide groove and have pin-and-hole outside cutterhead, and is connected with corresponding slide groove by guide finger at each pin-and-hole place, during push-plate motion, guide finger slides along slide groove; The inwall of push-plate is with tapering.

2. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 1, it is characterized in that, on described push-plate, each slide groove is 10 ~ 38 ° relative to the gradient of push-plate axis.

3. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 2, it is characterized in that, on described push-plate, each slide groove is 18 ° relative to the gradient of push-plate axis.

4. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 1, is characterized in that, the inwall of described push-plate is with the tapering of 10 ~ 30 °, and according to the throughput direction of copper pipe, the wall thickness of push-plate inwall reduces gradually.

5. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 1, is characterized in that, be also provided with end cap outside described push-plate, and the neighboring of end cap is along being connected with an end face of cutterhead overcoat; With convex cylinder in the middle part of end cap, form cavity between the outer wall of convex cylinder and the inwall of cutterhead overcoat, push-plate and cutter head assembly are positioned at cavity.

6. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 5, it is characterized in that, described convex cylinder periphery is provided with axle sleeve, and push-plate is placed on axle sleeve periphery;

Be cutterhead groove in the middle part of push-plate, the inwall of push-plate is the sidewall of cutterhead groove, and push-plate is provided with shoulder hole, arranges the first back-moving spring and the first bolt in shoulder hole, and the first back-moving spring is placed on the first bolt, and push-plate is connected with cutter head assembly by the first bolt.

7. the cutter-head mechanism of three-dimensional enhanced fin heat exchanger tube plow processing according to claim 6, it is characterized in that, described cutter head assembly comprises cutterhead, slide block, support set and planing tool, support set is placed on axle sleeve periphery, cutterhead is placed on support set, cutterhead is connected with push-plate with the first bolt by the first back-moving spring, and cutterhead is connected with support set by the second bolt;

Cutterhead is provided with multiple slide block slot, and each slide block slot correspondence installs a slide block, and each slide block installs a planing tool; During push-plate motion, along the radial direction of cutterhead, slide block slides in corresponding slide block slot; The joint of each slide block and support set is provided with second spring;

The abutted surface of cutterhead overcoat and cutterhead is provided with the 3rd back-moving spring.

8. the three-dimensional enhanced fin heat exchanger tube plow processing method that cutter-head mechanism realizes according to any one of claim 1 ~ 7, is characterized in that, when external push rod promotion push-plate travels forward, the tapering of push-plate inwall makes cutter head assembly carry out axial plow to copper pipe; Meanwhile, when push-plate travels forward, guide finger slides along the slide groove of push-plate outer wall surface thereof, orders about push-plate and carries out screw, thus drives cutter head assembly to carry out radial plow to copper pipe.

9. three-dimensional enhanced fin heat exchanger tube plow processing method according to claim 8, it is characterized in that, when described cutter head assembly carries out axial plow to copper pipe, detailed process is: when push-plate travels forward, first back-moving spring is compressed, the tapering of push-plate makes each slide block on cutterhead slide to cutter head center direction, thus drives planing tool incision copper pipe outer wall, and now the second back-moving spring is also compressed; When push-plate moves forward, planing tool also travels forward, and the degree of depth simultaneously cutting copper pipe outer wall also strengthens gradually; Therefore, after completing processing, the thickness of fin root is greater than the thickness of fin afterbody.

10. three-dimensional enhanced fin heat exchanger tube plow processing method according to claim 9, it is characterized in that, when described cutter head assembly carries out radial plow to copper pipe, detailed process is: when push-plate travels forward, and guide finger slides along slide groove, because slide groove is obliquely installed, so guide finger band movable knife disc overcoat carries out in axial sliding simultaneously, push-plate also carries out screw, and the screw of push-plate drives whole cutter head assembly to carry out corresponding screw, and now the 3rd back-moving spring is compressed;

Cutter head assembly carries out axial plow and radial plow to copper pipe simultaneously, realizes the time processing of three-dimensional enhanced fin heat exchanger tube;

After machining, by the effect of the first back-moving spring, the second back-moving spring and the 3rd back-moving spring, whole cutter-head mechanism resets; The mode of movement of copper pipe is batch (-type).