JP2010012572A - Non-magnetic pipe internal surface polishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-magnetic pipe internal surface polishing device suitably usable even when the internal surface of a non-magnetic pipe is severely fouled, preventing the efficiency of polishing operation from being lowered even when the polishing operation is performed continuously over a long period, and easily adjusting the intensity of a magnetic field according to the type of the non-magnetic pipe. <P>SOLUTION: In this polishing device 1, a fixing means 3 for fixing the non-magnetic pipe P and a rotating magnetic field generation means 4 for generating a magnetic field rotated from the outside of the non-magnetic pipe P in the outer peripheral direction are installed on the upper surface of a horizontally long rectangular support base 2. A sucking means 8 for sucking the inside of the non-magnetic pipe P for removing polishing waste produced by polishing is installed in the rear of the rotating magnetic field generation means 4. A cooling means 9 for cooling the rotating magnetic field generation means 4 is installed on the side of the rotating magnetic field generation means 4. Polishing means 10, 10, ..., comprising long cylindrical magnet substances are contained inside the fixed non-magnetic pipe P. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a polishing apparatus for polishing the inner surface of a nonmagnetic tube.

  A polishing method (polishing tool) made of a magnetic material is used as a polishing method for removing residue, dirt, etc. adhering to the inner surface of a non-magnetic tube (that is, a cylindrical tube made of a non-magnetic material such as stainless steel, aluminum or brass). In a non-magnetic tube, rotating the magnetic material accommodated by applying a magnetic field from the outside to the non-magnetic tube, and scraping off deposits on the inner surface of the non-magnetic tube by collision with the rotated magnetic material It has been known. As a polishing apparatus for polishing the inner surface of a nonmagnetic tube by applying a magnetic field from the outside as described above, a rotating magnetic field is generated by rotating a magnet in the outer peripheral direction of the nonmagnetic tube as in Patent Document 1. One having a rotating magnetic field generating means and a rotation driving means for rotating a nonmagnetic tube is known. According to such a polishing apparatus, the inner surface of the nonmagnetic tube can be easily polished without using a solvent or the like.

JP-A-5-337813

  However, the above conventional polishing apparatus accumulates polishing scraps according to the time required for the polishing operation, and the efficiency of the polishing operation is reduced. Therefore, when the dirt on the inner surface of the non-magnetic tube is severe, the polishing operation is interrupted. There was a problem that it was necessary to interrupt and remove the polishing debris inside the non-magnetic tube. In addition, since the rotating magnetic field generating means generates a rotating magnetic field with a magnet, a magnetic field having a high magnetic flux density cannot be generated inside the nonmagnetic tube, so that the nonmagnetic tube having a high degree of contamination is sufficiently polished. There was also a problem that it was not possible. In addition, since the strength of the magnetic field to be generated cannot be adjusted, when used in a non-magnetic tube with low rigidity, the high polishing means may damage the inner surface of the non-magnetic tube due to the high magnetic flux density. There was also.

  The object of the present invention is to solve the problems of the conventional polishing apparatus described above, and can be suitably used even when the inner surface of the non-magnetic tube is very dirty. Even when the polishing operation is continued for a long time, the polishing is continued. An object of the present invention is to provide a practical non-magnetic tube inner surface polishing apparatus in which work efficiency is not lowered and the strength of a magnetic field can be easily adjusted according to the type of non-magnetic tube.

  Among the present inventions, the invention described in claim 1 is provided with a rotating magnetic field generating means for generating a magnetic field rotating in the outer peripheral direction from the outside of the nonmagnetic tube, and a polishing means having magnetism. A polishing device for polishing the inner surface of the non-magnetic tube by rotating the polishing unit disposed in the circumferential direction along the inner surface in the non-magnetic tube by the rotating magnetic field generating unit. A suction means for sucking the inside of the non-magnetic tube for removal is provided.

  The invention described in claim 2 is the invention described in claim 1, wherein the rotating magnetic field generating means connects a three-phase power source to a coil that generates a magnetic field by electromagnetic induction, and a cooling means is provided in the coil. It is characterized by being.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the rotating magnetic field generating means generates a magnetic field having a magnetic flux density of 50 mT or more and 250 mT or less in the nonmagnetic tube. In addition, the polishing means is a cylindrical magnetic body having a length of 5 mm to 30 mm and a diameter of 0.5 mm to 3.0 mm.

  The nonmagnetic tube inner surface polishing apparatus according to claim 1 is provided with suction means for removing polishing debris, and therefore, the polishing debris does not hinder the rotation of the polishing means. Even if it is severe, the polishing operation can be easily continued for a long time without lowering the polishing efficiency.

  In the nonmagnetic tube inner surface polishing apparatus according to claim 2, since the rotating magnetic field generating means is a three-phase power source connected to a coil that generates a magnetic field by electromagnetic induction, the inner surface of the nonmagnetic tube is very dirty. Even in this case, it can be used suitably, and the strength of the magnetic field generated can be easily adjusted according to the type of the non-magnetic tube. Further, since the coil is provided with a cooling means, even when the coil is used for a long period of time, dielectric breakdown occurs in the rotating magnetic field generating means due to the heat generation of the coil, and the rotating magnetic field continues to be generated. The problem of being unable to do so does not occur.

  The non-magnetic tube inner surface polishing apparatus according to claim 3 polishes the inner surface of the non-magnetic tube very efficiently because the rotating magnetic field generating unit attracts the polishing unit with an appropriate strength inside the non-magnetic tube. be able to.

  Hereinafter, an embodiment of a nonmagnetic tube inner surface polishing apparatus (hereinafter simply referred to as a polishing apparatus) according to the present invention will be described in detail with reference to the drawings.

[Configuration of non-magnetic tube inner surface polishing equipment]
FIG. 1 shows an outline of a polishing apparatus according to the present invention. The polishing apparatus 1 has a horizontally long support base 2, and a nonmagnetic tube P is formed on the upper surface of the support base 2. In the longitudinal direction of the non-magnetic tube P, a fixing unit 3 for holding the tube at a predetermined height in parallel with the support base 2, a rotating magnetic field generating unit 4 for generating a magnetic field rotating in the outer peripheral direction from the outside of the non-magnetic tube P A moving means 5 and the like for moving the rotating magnetic field generating means 4 are provided. Further, at the rear of the rotating magnetic field generating means 4, there is provided a sucking means 8 for sucking the inside of the non-magnetic tube P in order to remove polishing debris generated by polishing. Cooling means 9 for cooling the rotating magnetic field generating means 4 is provided. On the other hand, the inside of the nonmagnetic tube P fixed to the support base 2 is scraped off the residue, dirt, etc. adhering to the inner surface of the nonmagnetic tube P by rotating in the circumferential direction along the inner surface of the nonmagnetic tube P. Polishing means 10, 10,... For taking are accommodated (see FIG. 5).

  2 and 3 are vertical cross-sectional views (vertical cross-sectional views cut along the longitudinal direction of the support) of the installed portion of the rotating magnetic field generating means 4. The rotating magnetic field generating means 4 includes the core 11, the coil 12, and the like. The magnetic field generator 13 is fixed by a support body 15 in which contact plates 14a and 14b are erected in parallel. FIG. 4 shows the core 11. The core 11 is formed in a flat rectangular column shape, and a circular insertion hole 16 for inserting the nonmagnetic tube P is formed in the center. Further, around the insertion hole 16, 36 slots 17, 17... Having a long fan shape are provided radially about the insertion hole 16. Then, two conductive wires having a predetermined diameter (diameter = about 0.45 mm) are bundled and wound so as to overlap phases between the slots 17, 17,. (See FIGS. 2 and 3). The magnetic field generator 13 is fixed in a state where the core 11 is sandwiched between the contact plates 14 a and 14 b of the support 15. The support 15 is slidably engaged with the guide rails 18 and 18 of the moving means 5. Further, as shown in FIG. 5, the magnetic field generator 13 is connected to a three-phase three-wire power source via a three-phase inverter, a switch, and a three-phase voltage regulator that constitute a variable voltage / variable frequency power source unit. It is in the state that was done. The three-phase inverter, switch, and three-phase voltage regulator function as the three-phase power supply 31.

  Further, as shown in FIG. 3, a front cover 19 formed in a flat cylindrical shape with a synthetic resin is installed on the front side of the magnetic field generator 13, and covers the front side of the coil 12 with a predetermined interval. It has become. An insertion hole 20 through which the nonmagnetic tube P is inserted is provided in the center of the front surface of the front cover 19, and a flat cylindrical guide pipe 21 is installed in the insertion hole 20. Further, on the side of the front cover 19, an air outlet 22 for feeding cooling air into the front cover 19 is formed. On the other hand, a rear cover 23 formed in the shape of a flat rectangular parallelepiped with synthetic resin is installed on the rear side of the magnetic field generator 13 so as to cover the rear side of the coil 12 with a predetermined interval. Yes. A circular air outlet 24 is formed in the center of the rear surface of the rear cover 23.

  As shown in FIG. 1, the suction unit 8 includes a long cylindrical suction duct 25 bent into a predetermined shape and a dust collector 26. The suction duct 25 has a distal end fixed to the rear side of the magnetic field generator 13 by a fixing member 7 fixed to the support base 2, and similarly to the base end of the nonmagnetic tube P fixed to the fixing member 7. Can be connected to. Further, the dust collector 26 incorporates a driving device (not shown) for performing suction through the suction duct 25 and a waste container (not shown) for storing the suctioned polishing waste. .

  Furthermore, the cooling means 9 is comprised by the cylindrical air duct 27 and the air blower 28 of the cross-sectional rectangle bent by the predetermined shape. In addition, although description is abbreviate | omitted in FIG. 1, the intermediate part of the ventilation duct 27 is formed with the material which has a softness | flexibility, and can be bent freely now. Further, a part of the tip of the air duct 27 is in communication with the air outlet 22 of the front cover 19, and part of the air duct 27 is in contact with the side surfaces of the contact plates 14 a and 14 b of the rotating magnetic field generating means 4. (See FIG. 3).

  Further, the fixing means is locked by the base 6 and the fixing member 7 having a predetermined height for disposing the nonmagnetic tube P in parallel with the support base, and the clamp portion 30 at the inner edge of the base 6. An electric actuator 32 for fixing the tip of the non-magnetic tube P is configured.

  On the other hand, the moving means 5 includes a pair of left and right guide rails 18 and 18 arranged so as to be parallel to the longitudinal direction of the support base 2 and a support 15 of the rotating magnetic field generating means 4 along the guide rails 18 and 18. And a driving device 29 (for example, a driving device using a ball screw mechanism). Then, the driving device 29 is in a state of being disposed in the lower cavity of the base 6 of the fixing means 3.

  In the polishing apparatus 1 configured as described above, the non-magnetic tube P (for example, a cylindrical tube formed of stainless steel) is inserted into the insertion hole 16 of the coil 12 of the rotating magnetic field generating means 4. The nonmagnetic tube P is held horizontally at a predetermined height by locking the distal end and the proximal end of the nonmagnetic tube P with the clamp portion 30 of the base 6 and the fixing member 7, respectively. It has become. Further, as shown in FIG. 6, the polishing means 10, 10... Are accommodated inside the nonmagnetic tube P held horizontally as described above (the portion corresponding to the inside of the core 11 and the coil 12). ing.

  The polishing means 10, 10,... Are cylindrical oil temper wires formed of silicon chrome steel for valve springs, have a diameter of about 1.2 mm and a length of about 20 mm. The polishing means 10, 10... Function as a magnetic material having magnetism in the magnetic field generated by the rotating magnetic field generating means 4.

  In the polishing apparatus 1, when the rotating magnetic field generation means 4 is turned on, a three-phase current of 60 Hz is applied to the coil 12, and a magnetic field due to an induced current is generated in the tube insertion hole P. The direction of the magnetic field changes so as to go around the vertical section around the axis of the tube insertion hole P every 1/60 seconds, and the position of the magnetic flux changes with the change of the direction of the magnetic field. When the magnetic flux is displaced in a predetermined cycle as described above, the magnetic polishing means 10, 10,... Is displaced inside the nonmagnetic tube P along with the displacement of the magnetic flux (that is, following the displacement of the magnetic flux). To rotate at high speed). Then, the polishing means 10, 10,... Rotating at such a high speed collide with the deposit in the nonmagnetic tube P and scrape off the deposit to polish the inner surface of the nonmagnetic tube P.

  The magnetic field generated by the rotating magnetic field generating means 4 is N-pole in the direction of displacement of the magnetic flux and S-pole in the opposite direction, so that each of the polishing means 10, 10. An attempt is made to maintain a state in which both ends are directed toward the N pole and the S pole. However, when the direction of the polishing means 10 is changed due to the collision with the deposit, the polishing means 10 that has changed its direction and the polishing means 10 with both ends of the shaft directed in the direction of the N pole and the S pole have a magnetic property. Therefore, the polishing means 10 and 10 rotate at high speed along the inner surface of the non-magnetic tube P while rotating randomly. It is possible to uniformly polish the inner surface of the nonmagnetic tube P by such rotational behavior of the polishing means 10, 10.

  Further, as described above, when the polishing means 10, 10... Performs polishing, the suction means 8 sucks the inside of the non-magnetic tube P to instantaneously collect the scraped polishing scraps. . Therefore, troubles such as the polishing means 10, 10,. Since the suction force of the suction means 8 is adjusted within a predetermined range, the situation that the polishing means 10, 10,... Are sucked does not occur.

  In addition, as described above, when the rotating magnetic field generating means 4 operates, the rotating magnetic field generating means 4 becomes hot, but the blower 28 of the cooling means 9 provided on the side of the rotating magnetic field generating means 4 Since the core 11 and the coil 12 of the rotating magnetic field generating means 4 are efficiently cooled, dielectric breakdown does not occur in unnecessary portions.

  Further, after the inner surface of the non-magnetic tube P located inside the core 11 is polished, the support 15 on which the rotating magnetic field generating means 4 is placed is moved along the guide rails 18 and 18 by the moving means 5. By changing the polishing work site. By such movement of the rotating magnetic field generating means 4, the nonmagnetic tube P can be polished over its entire length.

[Polishing experiment 1]
Using the polishing apparatus 1 configured as described above, the inner surface of a non-magnetic tube P (diameter = about 60.5 mm and thickness = about 2.8 mm) formed of stainless steel (SUS304) is polished. It was. In the polishing, the inner surface of the non-magnetic tube P was brushed with an acrylic paint and dried (wall thickness = about 1.0 mm), and the coating film was used as a substitute for the deposit. In addition, 200 of the above-described polishing means 10, 10,. Then, by applying a 200 V, 60 Hz three-phase power source to the rotating magnetic field generating means 4, the magnetic flux density on the inner surface (surface) of the nonmagnetic tube P is adjusted to about 85 mT, and the suction means 8 is operated. (Suction speed = 4.0 m / s), the polishing means 10, 10... Rotate inside the non-magnetic tube P, and the inner surface of the non-magnetic tube P is polished for about 3 minutes. The state of the inner surface of the nonmagnetic tube P was examined (in the above polishing, the moving means 5 was not operated). FIG. 7 is a photograph showing the inner surface of the non-magnetic tube P after polishing, and it can be seen that the inner surface of the non-magnetic tube P after polishing has a beautifully scraped coating film, giving off a metallic luster. .

[Polishing experiment 2]
Polishing the inner surface of the nonmagnetic tube P under the same conditions except that the same nonmagnetic tube P as the above-mentioned nonmagnetic tube P is used and no acrylic paint is applied, and the suction means 8 sucks and collects during the polishing. The weight of the scrap (ie, stainless steel powder) was measured. Furthermore, in order to confirm the change in the polishing efficiency by the suction means 8, the same polishing was performed without operating the suction means 8, and the weight of the polishing dust deposited on the inner surface of the nonmagnetic tube P was measured. Table 1 shows the measurement results of the weight of the polishing scraps. From Table 1, the weight of the polishing scrap when the suction means 8 is operated is larger than the weight of the polishing scrap when the suction means 8 is not operated, and the suction means 8 can be polished more efficiently. I understand.

[Effect of polishing equipment]
Since the polishing apparatus 1 is provided with the suction means 8 for sucking the inside of the nonmagnetic tube P in order to remove the polishing debris as described above, even if the dirt on the inner surface of the nonmagnetic tube P is severe, the debris is not removed. Since the rotation of the polishing means is not hindered, the polishing operation can be easily continued for a long time without lowering the polishing efficiency.

  In the polishing apparatus 1, the rotating magnetic field generating means 4 is the one in which the three-phase power source 31 is connected to the coil 12 that generates a magnetic field by electromagnetic induction. Therefore, the polishing apparatus 1 is suitable even when the inner surface of the nonmagnetic tube P is very dirty. In addition, it is possible to easily adjust the strength of the magnetic field generated according to the type of the non-magnetic tube P. Further, since the cooling means 9 is provided in the coil 12, even when the coil 12 is used for a long period of time, dielectric breakdown occurs in the rotating magnetic field generating means 4 due to heat generation of the coil 12, and the rotating magnetic field is generated. The situation that it is impossible to continue to generate does not occur.

  Further, the polishing apparatus 1 is adjusted so that the rotating magnetic field generating means 4 generates a magnetic field having a predetermined magnetic flux density in the nonmagnetic tube P, and the polishing means 10, 10 attracted by the rotating magnetic field generating means 4. .. is adjusted to a predetermined size and shape, so that the rotating magnetic field generating means 4 attracts the polishing means 10, 10,... With an appropriate strength inside the nonmagnetic pipe P. The inner surface can be polished very efficiently.

  The configuration of the polishing apparatus of the present invention is not limited to the aspect of the above embodiment, and the configuration of the shape, structure, etc. of the rotating magnetic field generating means, polishing means, moving means, suction means, cooling means, etc. Any change can be made without departing from the spirit of the present invention. For example, the cooling means is not limited to one that blows air as in the above embodiment, but can be changed to one that uses a cooling medium other than air. Further, the polishing means is not limited to the cylindrical shape as in the above embodiment, but can be changed to a pin shape with a sharpened tip. Further, even when a columnar magnetic body is used as the polishing means, the size, weight, etc. are not limited to those of the above embodiment, and are appropriately determined according to the magnetic flux density of the magnetic field generated in the nonmagnetic tube. It is possible to change.

It is explanatory drawing which shows the outline of a grinding | polishing apparatus. It is explanatory drawing which shows the vertical cross section (vertical cross section along the longitudinal direction of a support stand) of a rotating magnetic field generation means. It is explanatory drawing (perspective explanatory drawing) which shows the vertical cross section (vertical cross section along the longitudinal direction of a support stand) of a rotating magnetic field generation means. It is explanatory drawing which shows the front of a core. It is explanatory drawing which shows a three-phase power supply. It is explanatory drawing which shows the state by which the grinding | polishing means is arrange | positioned in the nonmagnetic tube inside the rotating magnetic field generating means. It is a photograph which shows the inner surface of the nonmagnetic tube after grind | polishing with a grinder.

Explanation of symbols

1. ・ Polishing device (Non-magnetic tube inner surface polishing device)
4 .. Rotating magnetic field generating means 8 .... Attracting means 9 .... Cooling means 10 .... Polishing means 12 .... Coil 31 ... Three-phase power supply

Claims (3)

A rotating magnetic field generating means for generating a magnetic field rotating in the outer circumferential direction from the outside of the nonmagnetic tube and a polishing means having magnetism are provided, and the polishing means disposed in the nonmagnetic tube is non-moved by the rotating magnetic field generating means. A polishing apparatus for polishing an inner surface of a non-magnetic tube by rotating in a circumferential direction along the inner surface in a magnetic tube,
An apparatus for polishing an inner surface of a nonmagnetic tube, wherein suction means for sucking the inside of the nonmagnetic tube is provided in order to remove polishing debris generated by polishing.   2. The nonmagnetic tube inner surface polishing according to claim 1, wherein the rotating magnetic field generating means is one in which a three-phase power source is connected to a coil that generates a magnetic field by electromagnetic induction, and a cooling means is provided in the coil. apparatus. The rotating magnetic field generating means generates a magnetic field having a magnetic flux density of 50 mT to 250 mT in the non-magnetic tube;
The non-magnetic tube inner surface according to claim 1 or 2, wherein the polishing means is a cylindrical magnetic body having a length of 5 mm to 30 mm and a diameter of 0.5 mm to 3.0 mm. Polishing equipment.

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