Device and method for removing burrs in holes of PTFE material printed board

Abstract

A device and method for removing burrs in holes of a PTFE material printed board comprises a lifting mechanism, a rotating mechanism is installed on the lifting mechanism, the lifting mechanism is arranged at the output end of a two-dimensional linear XY translation table so that the lifting mechanism can move in a plane, the lifting mechanism is used for driving the rotating mechanism to move in the Z direction, a first removing piece is arranged on the rotating mechanism, and a second removing piece is arranged on the first removing piece. A first removing part is arranged at the lower end of the automatic control system, a second removing part is arranged at the lower end of the first removing part, the first removing part is used for removing burrs on the inner wall of a hole with the diameter larger than 2 mm, and the second removing part is used for removing burrs on the inner wall of a hole with the diameter smaller than 2 mm. Therefore, the efficiency and the automation degree when burrs in holes are removed are improved. According to the method, two schemes are adopted for burr treatment, a reasonable removal mode is selected according to the aperture size, and it is ensured that burrs can be completely and thoroughly removed.

Description

Technical Field

[0001] The invention relates to printed circuit board processing, and in particular to a device and method for removing burrs in holes of a PTFE printed circuit board. Background Art

[0002] PTFE, short for polytetrafluoroethylene, is widely used as a dielectric material for printed circuit boards due to its excellent dielectric properties. However, due to its relatively soft texture, burrs often form during drilling, where the drill bit fails to cut through the fibers. Due to the inherent properties of PTFE, there are few effective methods to completely eliminate burrs. Existing methods, such as direct scraping, suffer from poor cleaning effectiveness and incomplete cleaning. Summary of the Invention

[0003] The present invention provides a device and method for removing burrs from holes in a PTFE printed circuit board, which addresses the deficiencies of the prior art and the problem of inconvenience in removing burrs from holes in a PTFE printed circuit board, and has strong practicality.

[0004] In order to achieve the purpose of the present invention, the following technologies are proposed: A device for removing burrs from holes in PTFE printed circuit boards comprises a lifting mechanism, which is equipped with a rotating mechanism. The lifting mechanism is arranged on the output end of a two-dimensional linear XY translation stage so that the lifting mechanism moves within a plane. The lifting mechanism is used to drive the rotating mechanism to move in the Z direction. A first removing member is provided on the rotating mechanism, and a second removing member is provided at the lower end of the first removing member. The first removing member is used to remove burrs from the inner wall of holes with a diameter greater than 2 mm, and the second removing member is used to remove burrs from the inner wall of holes with a diameter less than 2 mm.

[0005] Furthermore, the two-dimensional linear XY translation stage, the lifting mechanism and the rotation mechanism are connected to an automatic control system, which stores the design drawings of the printed circuit board to be processed. The automatic control system is used to control the X, Y and Z positions of the first removal member and the second removal member, and is connected to the gas control valve to control the start and stop of the gas spray.

[0006] Furthermore, the lifting mechanism includes a back plate fixed on the output end of the two-dimensional linear XY translation stage, a pair of guide rails are installed on the back plate, a slider is slidingly provided on the guide rail, a lifting plate is installed on the slider through bolts, a nut is installed on the inner end of the lifting plate through bolts, a screw rod is connected to the nut through a thread, bearing seats are rotatably provided at both ends of the screw rod, the bearing seats are installed on the back plate through screws, one end of the screw rod is connected to the motor through a coupling, and the motor is fixed to the back plate through bolts and a mounting seat.

[0007] Furthermore, the rotating mechanism includes a rotating motor installed on the lifting plate by bolts, the output shaft of the rotating motor is connected to the rotating shaft, the lower end of the rotating shaft is formed with a rotating cover, the bottom of the rotating cover is provided with a first circular groove, the circumference of the rotating cover is provided with multiple connecting holes, the inner periphery of the rotating cover is formed with multiple vertical clips, and the inner ends of the connecting holes extend into the first circular groove.

[0008] Furthermore, the first removal member includes an insertion rod inserted in the first circular groove, the insertion rod is connected to a radial screw by a thread, the outer end of the radial screw is passed through the connecting hole, the lower end of the insertion rod is formed with a buckle cover, the interior of the buckle cover is connected to a tube body by a thread, a circle of upper through holes and a circle of lower through holes are provided on the circumference of the tube body, the upper through hole is located above the lower through hole, an upper ring is fixed to the upper end of the tube body, a lower ring is provided below the upper ring, the lower ring is fixed to the inner circumference of the tube body, a movable disk is movably provided between the upper ring and the lower ring, the movable disk is located in the tube body, a convex ring is formed on the upper end of the movable disk, the inner circumference of the convex ring is a conical structure, the upper end diameter of the conical structure of the convex ring is larger than the diameter of its lower end, the outer circumference of the lower end of the upper ring is formed with a conical wall, and the upper end of the conical wall of the upper ring is The outer diameter is larger than the diameter of its lower end, and a plurality of first channels are formed on the movable disk, one end of the first channel passes through the upper wall of the movable disk, and the other end of the first channel passes through the outer circumference of the movable disk, and the first channel and the upper through hole and the lower through hole are respectively in a one-to-one correspondence, and an inner convex ring is formed on the inner wall of the tube body, and the upper end of the inner convex ring is a conical structure, and the upper end diameter of the conical structure of the inner convex ring is larger than the diameter of its lower end, and a connecting ring is connected to the inside of the lower end of the tube body by a thread, and a lower ring member is formed at the lower end of the connecting ring, and the interior of the lower ring member has an annular cavity, and a plurality of inner connecting holes are opened on the inner circumference of the lower ring member, and the inner connecting holes are connected to the annular cavity, and a plurality of outer connecting holes are opened on the outer circumference of the lower ring member, and the outer connecting holes are connected to the annular cavity, and a rubber ring is sealed and fixed on the outer wall of the lower ring member; The upper end of the tube body is connected to a first air pipe, the upper end of the first air pipe is connected to a lower universal valve, the upper end of the tube body is also connected to a second air pipe, the upper end of the second air pipe is connected to an upper universal valve, the upper universal valve is fixed to the lifting plate, the lower universal valve is fixed to the lower end of the upper universal valve, the rotating shaft is passed through the upper universal valve and the lower universal valve, the inner end of the second air pipe passes through the movable disk and extends downward, the movable disk moves on the second air pipe, and the inner end of the first air pipe extends into the interior of the tube body; A movable cover is movably provided at the lower end of the inner part of the tube body, and a second circular groove is formed at the upper end of the movable cover. A cut-off convex edge is formed at the upper end of the outer periphery of the movable cover, and the lower end surface of the cut-off convex edge is a conical structure. The upper end diameter of the conical structure of the cut-off convex edge is larger than the lower end diameter. A plurality of outer rows of holes are opened at the lower end of the peripheral side of the movable cover, and a connecting lower rod is formed at the lower end of the movable cover. When air is filled into the tube body through the first air pipe, the outer discharge hole and the inner connecting hole are connected, so that the air enters the rubber ring through the outer discharge hole, the inner connecting hole, the annular cavity, and the outer connecting hole. The conical structure of the cut-off convex edge abuts against the conical structure of the inner convex ring, the upper end surface of the movable disk abuts against the lower wall of the upper ring, and the inner periphery of the convex ring abuts against the conical wall of the upper ring. The first channel is connected to the corresponding upper through hole. When no air flows into the first air pipe, the lower end of the movable disc contacts the upper end surface of the lower ring, and the first channel is connected to the corresponding lower through hole; The lower end of the lower rod is connected to a tapered column through a thread, the outer circumference of the tapered column is a conical surface, and the diameter of the lower end of the conical surface of the tapered column is smaller than the diameter of its upper end, the lower end of the tapered column is provided with a push column, the lower end of the push column is provided with an upper spring, the lower end of the lower ring is sealed and fixed with a lower end ring, the inner circumference of the lower end ring is formed with a septum ring, the inner circumference of the septum ring is connected to an embedded shell through a thread, the lower end of the upper spring abuts against the inner lower end of the embedded shell, and the upper spring is located in the embedded shell, the tapered column moves axially above the septum ring, and the septum ring is provided with multiple pairs of guide holes, and the guide holes are penetrated by The movable rod, the lower end of each pair of movable rods is connected to a lower movable plate by a thread, the lower movable plate is located below the middle septum ring, a lower convex plate is formed on the lower movable plate, an inner top spring is fixed on the lower convex plate, and the outer end of the inner top spring abuts against the inner circumference of the lower end ring, the upper end of each pair of movable rods is connected to an outward push block by a thread, the inner circumference of the outward push block is formed with a conical arc wall, the conical surface of the conical column acts on the inner circumference of the conical arc wall, and a card groove is formed at the outer end of the outward push block, and convex strips are formed on both sides of the inner side of the card groove, a scraper is passed through the card groove, the scraper is passed through the peripheral side of the lower end ring, and the convex strips are clamped on both sides of the scraper.

[0009] Furthermore, a lower cover plate is fixed to the lower end of the lower end ring, and a lower extension tube is formed on the lower wall of the lower cover plate. A plurality of umbrella-shaped rings are formed on the outer circumference of the lower extension tube. The diameter of the lower end of the umbrella-shaped ring is larger than the diameter of its upper end, and the outer diameter of the umbrella-shaped ring increases successively from bottom to top. An inner cavity is formed inside the lower extension tube, and the lower end of the inner cavity is connected to an air outlet eye. Conical holes are formed at both ends of the air outlet eye. The diameter of the lower end of the conical hole at the upper end is smaller than the diameter of the upper end, and the diameter of the lower end of the conical hole at the lower end is larger than the diameter of the upper end. The upper end of the lower extension tube is connected to an air guide pipe, one end of the air guide pipe is connected to the inner cavity, and the other end of the air guide pipe is connected to the lower through hole.

[0010] The advantages of the above technical solution are: The present invention firstly controls the removal process through an automatic control system to improve the efficiency and automation level of burr removal in holes.

[0011] Secondly, the present invention adopts two sets of schemes to carry out burr treatment, so as to select a reasonable removal method according to the aperture size to ensure that the burrs can be completely and thoroughly removed.

[0012] The present invention removes burrs by first using dry ice to harden and embrittle the material, then scraping the burrs away. The dry ice sublimates, creating micro-explosions within the hole, removing burrs with weaker connections. However, some burrs, due to their thicker roots, remain on the inner wall of the hole, requiring further scraping. Furthermore, the present invention removes burrs hole by hole, improving removal efficiency while reducing dry ice usage. It also prevents large-scale contact between dry ice and the printed circuit board, which could increase the brittleness of the entire board and potentially cause board breakage during disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0014] Figure 1 The figure shows a three-dimensional structure diagram of a burr removal device for a PTFE printed circuit board hole.

[0015] Figure 2 Shown is a three-dimensional structural diagram of the lifting mechanism.

[0016] Figure 3 Shows a three-dimensional structural diagram of the rotating mechanism.

[0017] Figure 4 The three-dimensional structure diagram and the cross-sectional structure diagram of the first removal member and the second removal member are shown.

[0018] Figure 5 A three-dimensional structural diagram and a cross-sectional structural diagram of the lower portion of the first removal member and the second removal member are shown.

[0019] Figure 6 A three-dimensional structural diagram of the lower portion of the first removing member is shown.

[0020] Figure 7 A three-dimensional diagram of the structure of a positioning jig for removing burrs from holes in PTFE printed circuit boards is shown. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, a PTFE printed circuit board hole burr removal device includes a lifting mechanism 1, on which a rotating mechanism 2 is installed. The lifting mechanism 1 is arranged on the output end of a two-dimensional linear XY translation stage so that the lifting mechanism 1 moves in a plane. The lifting mechanism 1 is used to drive the rotating mechanism 2 to move in the Z direction. A first removal member 3 is provided on the rotating mechanism 2, and a second removal member 4 is provided at the lower end of the first removal member 3. The first removal member 3 is used to remove burrs on the inner wall of a hole with a diameter greater than 2 mm, and the second removal member 4 is used to remove burrs on the inner wall of a hole with a diameter less than 2 mm.

[0022] The two-dimensional linear XY translation stage, the lifting mechanism 1, and the rotating mechanism 2 are connected to an automatic control system. The automatic control system stores the design drawings of the printed circuit board to be processed. The automatic control system is used to control the X, Y, and Z positions of the first removal member 3 and the second removal member 4, and is connected to the gas control valve to control the start and stop of the gas ejection.

[0023] The two-dimensional linear XY translation stage is mainly composed of two mutually perpendicular lead screws, each of which is connected to a motor, and the motor is connected to an absolute encoder.

[0024] like Figure 2 As shown, the lifting mechanism 1 includes a back plate 10 fixed on the output end of the two-dimensional linear XY translation stage, a pair of guide rails 11 are installed on the back plate 10, a slider 12 is slidably provided on the guide rail 11, a lifting plate 13 is installed on the slider 12 by bolts, a nut 14 is installed on the inner end of the lifting plate 13 by bolts, a screw rod 15 is connected to the nut 14 by a thread, and bearing seats 17 are rotatably provided at both ends of the screw rod 15, the bearing seat 17 is installed on the back plate 10 by screws, one end of the screw rod 15 is connected to the motor 16 through a coupling, and the motor 16 is fixed to the back plate 10 by bolts and a mounting seat. When the lifting mechanism 1 controls the movement of the lifting plate 13, the motor 16 drives the screw rod 15 to rotate, so that the nut 14 and the lifting plate 13 are lifted and moved along the length direction of the guide rail 11.

[0025] like Figure 3 As shown, the rotating mechanism 2 includes a rotating motor 20 mounted on the lifting plate 13 by bolts, the output shaft of the rotating motor 20 is connected to the rotating shaft 21, the lower end of the rotating shaft 21 is formed with a rotating cover 22, the bottom of the rotating cover 22 is provided with a first circular groove 24, the circumference of the rotating cover 22 is provided with a plurality of connecting holes 23, the inner circumference of the rotating cover 22 is formed with a plurality of vertical clips 25, the inner side ends of the connecting holes 23 extend into the first circular groove 24, and when the rotating shaft 21 rotates, it is driven to rotate by the rotating motor 20.

[0026] like Figures 4 to 6As shown, the first removal member 3 includes an insertion rod 300 inserted into the first circular groove 24, and a radial screw 302 is connected to the insertion rod 300 through a thread, and the outer end of the radial screw 302 is passed through the connecting hole 23. A buckle cover 301 is formed at the lower end of the insertion rod 300, and a plurality of embedded vertical grooves 315 are opened on the outer periphery of the buckle cover 301, and the vertical clip 25 is passed through the embedded vertical groove 315, so as to ensure the connection stability between the rotating shaft 21 and the buckle cover 301. The interior of the buckle cover 301 is connected to the tube body 307 by threads. A circle of upper through holes 316 and a circle of lower through holes 318 are formed on the circumference of the tube body 307. The upper through holes 316 are located above the lower through holes 318. An upper ring 308 is fixed to the upper end of the tube body 307, and a lower ring 310 is provided below the upper ring 308. The lower ring 310 is fixed to the inner circumference of the tube body 307. A movable disk 309 is movably provided between the upper ring 308 and the lower ring 310. The movable disk 309 is located in the tube body 307. A convex ring is formed on the upper end of the movable disk 309. The inner circumference of the convex ring is a conical structure. The upper end diameter of the conical structure of the convex ring is larger than the diameter of its lower end. A conical wall is formed on the outer circumference of the lower end of the upper ring 308. The outer diameter of the upper end of the conical wall of the upper ring 308 is larger than the diameter of its lower end. The conical structure design of the conical wall and the convex ring is to improve the sealing effect between the movable disk 309 and the upper ring 308. The movable disk 309 is formed with a plurality of first channels 317. One end of the first channel 317 passes through the upper wall of the movable disk 309, and the other end of the first channel 317 passes through the outer periphery of the movable disk 309. The first channels 317 are in a one-to-one correspondence with the upper through hole 316 and the lower through hole 318. The inner wall of the tube body 307 is formed with an inner convex ring 311. The upper end of the inner convex ring 311 is a conical structure. The upper end diameter of the conical structure of the inner convex ring 311 is larger than the diameter of its lower end. The lower end of the tube body 307 is connected to the connecting ring 33 by a thread. 9. A lower ring 321 is formed at the lower end of the connecting ring 339. The interior of the lower ring 321 has an annular cavity 323. A plurality of inner connecting holes 322 are provided on the inner periphery of the lower ring 321. The inner connecting holes 322 are communicated with the annular cavity 323. A plurality of outer connecting holes 324 are provided on the outer periphery of the lower ring 321. The outer connecting holes 324 are communicated with the annular cavity 323. A rubber ring 325 is sealed and fixed on the outer wall of the lower ring 321. The setting of the rubber ring 325 facilitates the cleaning of burrs in a close-fitting manner, and has the advantages of comprehensiveness and thoroughness during cleaning.

[0027] The upper end of the tube body 307 is connected to the first air pipe 305, and the upper end of the first air pipe 305 is connected to the lower universal valve 304. The upper end of the tube body 307 is also connected to the second air pipe 306, and the upper end of the second air pipe 306 is connected to the upper universal valve 303. The upper universal valve 303 is fixed on the lifting plate 13, and the lower universal valve 304 is fixed to the lower end of the upper universal valve 303. The rotating shaft 21 is passed through the upper universal valve 303 and the lower universal valve 304. The inner end of the second air pipe 306 passes through the movable disk 309 and extends downward. The movable disk 309 moves on the second air pipe 306, and the inner end of the first air pipe 305 extends into the interior of the tube body 307.

[0028] A movable cover 312 is movably provided at the lower end of the inner part of the tube body 307, and a second circular groove is formed at the upper end of the movable cover 312. A cut-off ridge 319 is formed at the upper end of the outer periphery of the movable cover 312, and the lower end surface of the cut-off ridge 319 is a conical structure. The upper end diameter of the conical structure of the cut-off ridge 319 is larger than the lower end diameter. A plurality of outer rows of holes 320 are provided at the lower end of the peripheral side of the movable cover 312, and a connecting lower rod 313 is formed at the lower end of the movable cover 312.

[0029] When air is injected into tube body 307 through first air pipe 305, external exhaust hole 320 communicates with internal connecting hole 322, allowing air to enter rubber ring 325 through external exhaust hole 320, internal connecting hole 322, annular cavity 323, and external connecting hole 324. The tapered structure of cutoff ridge 319 abuts against the tapered structure of inner convex ring 311, enhancing the sealing effect. The upper end surface of movable disk 309 abuts against the lower wall of upper ring 308, and the inner periphery of the convex ring abuts against the tapered wall of upper ring 308, enhancing the sealing effect. First channel 317 communicates with its corresponding upper through hole 316.

[0030] When no air flows into the first air pipe 305 , the lower end of the movable disk 309 contacts the upper end surface of the lower ring 310 , and the first channel 317 is communicated with the corresponding lower through hole 318 .

[0031] The lower end of the lower rod 313 is connected to a tapered column 314 through a thread. The outer circumference of the tapered column 314 is a conical surface, and the diameter of the lower end of the conical surface of the tapered column 314 is smaller than the diameter of its upper end. The lower end of the tapered column 314 is provided with a push column 326, and the lower end of the push column 326 is provided with an upper spring 328. The lower end of the lower ring 321 is sealed and fixed with a lower end ring 331. The inner circumference of the lower end ring 331 is formed with a middle septum ring 327. The inner circumference of the middle septum ring 327 is connected to an embedded shell 329 through a thread. The lower end of the upper spring 328 abuts against the inner lower end of the embedded shell 329, and the upper spring 328 is located in the embedded shell 329. The tapered column 314 moves axially above the middle septum ring 327. The middle septum ring 327 is provided with a plurality of pairs of guide holes 333. The guide holes 333 are provided with movable The cam 338 is a handle that is fixed on the cam 339 to the top of the cam 339, and the handle 339 is a handle that is fixed on the cam 339 to the top of the cam 339. When air is injected into the movable cover 312, the conical column 314 will move downward and the upper spring 328 will be compressed. During the downward movement of the conical column 314, the conical surface of the conical column 314 acts on the inner circumference of the conical arc wall 337, thereby causing the push block 336 and the scraper 340 to move outward. At the same time, the scraper 340 extends from the lower end ring 331, and the distance between its outer end and the center of the lower end ring 331 is equal to the diameter of the corresponding hole. When the push block 336 moves, the inner spring 330 is also compressed. When the movable cover 312 loses the effect of air, the upper spring 328 restores the conical column 314 to its initial position, and the scraper 340 will retreat under the action of the inner spring 330.

[0032] like Figure 5As shown, a lower cover plate 400 is fixed to the lower end of the lower end ring 331, a lower extension tube 401 is formed on the lower wall of the lower cover plate 400, and a plurality of umbrella-shaped rings 402 are formed on the outer periphery of the lower extension tube 401. The diameter of the lower end of the umbrella-shaped ring 402 is larger than the diameter of the upper end thereof, and the outer diameter of the umbrella-shaped ring 402 increases successively from bottom to top. The setting of the umbrella-shaped ring 402 is convenient for scraping burrs from different holes, and facilitates the discharge of burrs, etc. during the scraping process. An inner cavity 404 is formed inside the lower extension tube 401, and the lower end of the inner cavity 404 is connected to an air outlet eye 405. Conical holes are formed at both ends of the air outlet eye 405. The diameter of the lower end of the conical hole at the upper end is smaller than the diameter of the upper end, and the diameter of the lower end of the conical hole at the lower end is larger than the diameter of the upper end. The upper end of the lower extension tube 401 is connected to an air guide tube 403, one end of the air guide tube 403 is connected to the inner cavity 404, and the other end of the air guide tube 403 is connected to the lower through hole 318.

[0033] Example 2 like Figure 7 As shown, a positioning fixture for removing burrs in holes of a PTFE-made printed circuit board comprises a workbench 5, a ring frame 51 being formed on the lower wall of the workbench 5, four pairs of waist-shaped holes 50 being arranged in a circular array around the geometric center of the workbench, connecting screws 52 being passed through the waist-shaped holes 50, the upper end of each pair of connecting screws 52 being connected to a positioning block 53 by a thread, an inner convex clamping plate 54 being formed on the inner side of the upper end of the positioning block 53, the lower end of each pair of connecting screws 52 being connected to a lower movable plate 57 by a thread, the lower movable plate 57 being located on the lower side of the workbench 5, a support frame 50 being provided at the upper end of the workbench 5, and an embedded ring groove 51 being provided at the upper end of the support frame 50.

[0034] Example 3 A method for removing burrs from holes in a PTFE printed circuit board comprises the following steps: Step 01, placing the printed circuit board made of PTFE material to be processed on the support frame 50 of the workbench 5, and embedding the printed circuit board 6 in the embedded annular groove 51 of the support frame 50 during placement; Step 02: Rotate the connecting screw 52 according to the thickness of the printed circuit board 6 to adjust the height of the inner convex clamping plate 54; Step 03, move the inner convex card plate 54 on the positioning block 53 inward so that the inner convex card plate 54 is located above the printed circuit board 6, and rotate the connecting screw 52 so that the lower wall of the inner convex card plate 54 acts on the upper wall of the printed circuit board 6; Step 04: importing the design drawing of the printed circuit board to be processed into a computer with an automatic control system, wherein the design drawing has the geometric coordinate information, the diameter and the depth of the holes on the printed circuit board; Step 05: Start the automatic control system and control the two-dimensional linear XY translation stage to drive the lifting mechanism 1 to move so that the first removal member 3 is located directly above the positioning hole of the printed circuit board 6; Step 06, the automatic control system controls the first removal member 3 to move to each hole of the printed circuit board 6 along a predetermined trajectory according to the geometric coordinate information of the holes on the printed circuit board 6; Step 07, the automatic control system controls the lifting mechanism 1 to move downward according to the hole diameter and hole depth; If the diameter of the hole is greater than 2 mm, the lifting mechanism 1 drives the second removal member 4 to pass through the corresponding hole, and the scraper 340 and the rubber ring 325 are located below the corresponding hole; The automatic control system controls the air intake pump to allow air to enter the movable disk 309, the tube body 307 and the movable cover 312 through the lower universal valve 304 and the second air pipe 306, so that the movable disk 309 moves upward and the movable cover 312 moves downward. When the movable disk 309 moves upward, the upper end surface of the movable disk 309 abuts against the lower wall of the upper ring 308, and the inner periphery of the convex ring abuts against the conical wall of the upper ring 308. The first channel 317 is connected with its corresponding upper through hole 316. After the movable cover 312 moves into place, the outer discharge hole 320 and the inner connecting hole 322 are connected, so that air enters the rubber ring 325 through the outer discharge hole 320, the inner connecting hole 322, the annular cavity 323 and the outer connecting hole 324, so that the outer diameter of the rubber ring 325 is larger than the inner diameter of the corresponding hole. As the conical column 314 moves downward, the push block 336 moves outward and the scraper 340 moves out. The automatic control system controls dry ice at a temperature less than -78.5°C to enter the upper end of the tube body 307 through the lower universal valve 304 and the first air pipe 305, so that the dry ice is ejected outwardly through the first channel 317 and the corresponding upper through hole 316 onto the inner wall of the printed circuit board 6. The dry ice is kept in contact with the inner wall of the hole for more than 2 seconds, increasing the hardness and brittleness of the burrs on the inner wall of the hole. During this time, the dry ice absorbs heat and sublimates. During the sublimation process, the dry ice particles expand and collide with each other during the expansion process, thereby generating a micro-explosive force to remove the fine burrs in the hole. After this, the filling of the hole with dry ice particles is stopped. The automatic control system controls the lifting mechanism 1 to drive the rubber ring 325 to move upward, so that the outer periphery of the rubber ring 325 acts on the roots of the burrs or parts of the burrs that have not been removed, so that the burrs are removed from the hole; When the automatic control system controls the lifting mechanism 1 to drive the rubber ring 325 upward, the rotating motor 20 drives the rotating shaft 21 and the scraper 340 to rotate, so that the scraper 340 acts on the burrs that have not been removed, thereby removing them from the hole; If the diameter of the hole is less than 2 mm, the lifting mechanism 1 drives the lower extension tube 401 of the second removal member 4 to pass through the corresponding hole; The automatic control system controls the flow of dry ice at a temperature less than -78.5°C through the lower universal valve 304 and the first air pipe 305 into the upper end of the tube body 307. At this point, the lower end of the movable disk 309 contacts the upper end surface of the lower ring 310. Dry ice particles are then ejected through the first channel 317 and the corresponding lower through hole 318, the air guide tube 403, the inner cavity 404, and the air outlet 405, filling the corresponding holes. The dry ice brittles the burrs and removes the burrs with the micro-explosion generated by the sublimation of the dry ice. The dry ice feed is stopped after 2 seconds. The automatic control system controls the lifting mechanism 1 to drive the lower extension tube 401 to move up and down reciprocatingly. During the movement, the outer edge of the umbrella ring 402 acts on the inner wall of the hole to scrape off burrs. Step 08, complete the removal of all burrs on the inner wall of the hole through the automatic control system, cancel the positioning of the printed circuit board 6 after removal, and take out the printed circuit board 6.

[0035] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It is apparent that various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the present invention. Thus, the present invention is intended to encompass such modifications and variations as long as they fall within the scope of the claims and their equivalents.

Claims

1. A PTFE printed circuit board hole burr removal device, characterized in that: The invention comprises a lifting mechanism (1), a rotating mechanism (2) is installed on the lifting mechanism (1), the lifting mechanism (1) is arranged on the output end of the two-dimensional linear XY translation stage so that the lifting mechanism (1) moves in a plane, the lifting mechanism (1) is used to drive the rotating mechanism (2) to move in the Z direction, a first removing member (3) is provided on the rotating mechanism (2), a second removing member (4) is provided at the lower end of the first removing member (3), the first removing member (3) is used to remove burrs on the inner wall of a hole with a diameter greater than 2 mm, and the second removing member (4) is used to remove burrs on the inner wall of a hole with a diameter less than 2 mm.

2. The PTFE printed circuit board hole burr removal device according to claim 1, characterized in that: The two-dimensional linear XY translation stage, the lifting mechanism (1) and the rotating mechanism (2) are connected to an automatic control system. The design drawings of the printed circuit board to be processed are stored in the automatic control system. The automatic control system is used to control the X, Y and Z positions of the first removal member (3) and the second removal member (4), and is connected to the gas control valve to control the start and stop of the gas ejection.

3. The PTFE printed circuit board hole burr removal device according to claim 1, characterized in that: The lifting mechanism (1) includes a back plate (10) fixed on the output end of the two-dimensional linear XY translation stage, a pair of guide rails (11) are installed on the back plate (10), a slider (12) is slidably provided on the guide rail (11), a lifting plate (13) is installed on the slider (12) by bolts, a nut (14) is installed on the inner side end of the lifting plate (13) by bolts, a screw rod (15) is connected to the nut (14) by thread, and bearing seats (17) are rotatably provided at both ends of the screw rod (15), and the bearing seat (17) is installed on the back plate (10) by screws. One end of the screw rod (15) is connected to a motor (16) by a coupling, and the motor (16) is fixed to the back plate (10) by bolts and a mounting seat.

4. The PTFE printed circuit board hole burr removal device according to claim 3, characterized in that: The rotating mechanism (2) includes a rotating motor (20) mounted on the lifting plate (13) by bolts. The output shaft of the rotating motor (20) is connected to a rotating shaft (21). A rotating cover (22) is formed at the lower end of the rotating shaft (21).

5. The PTFE printed circuit board hole burr removal device according to claim 1, characterized in that: The first removal member (3) includes a buckle cover (301) inserted into the rotating cover (22), the buckle cover (301) is connected to the tube body (307), a circle of upper through holes (316) and a circle of lower through holes (318) are provided on the circumference of the tube body (307), an upper ring (308) is fixed to the upper end of the tube body (307), a lower ring (310) is provided below the upper ring (308), the lower ring (310) is fixed to the inner circumference of the tube body (307), a movable disk (309) is movably provided between the upper ring (308) and the lower ring (310), and a plurality of first channels (317) are formed on the movable disk (309), and the first channels (317) are connected to the first channels (317). The upper through hole (316) and the lower through hole (318) are in a one-to-one correspondence. The lower end of the tube body (307) is connected to a connecting ring (339). The lower end of the connecting ring (339) is formed with a lower ring member (321). The interior of the lower ring member (321) has an annular cavity (323). The inner periphery of the lower ring member (321) is provided with a plurality of inner connecting holes (322). The inner connecting holes (322) are communicated with the annular cavity (323). The outer periphery of the lower ring member (321) is provided with a plurality of outer connecting holes (324). The outer connecting holes (324) are communicated with the annular cavity (323). A rubber ring (325) is sealed and fixed on the outer wall of the lower ring member (321). The upper end of the tube body (307) is connected to the first air pipe (305), the upper end of the first air pipe (305) is connected to the lower universal valve (304), the upper end of the tube body (307) is also connected to the second air pipe (306), the upper end of the second air pipe (306) is connected to the upper universal valve (303); A movable cover (312) is movably provided at the inner lower end of the tube body (307), and a plurality of outer holes (320) are provided at the circumferential lower end of the movable cover (312); When air is filled into the tube body (307) through the first air pipe (305), the outer discharge hole (320) and the inner connecting hole (322) are connected, so that the air enters the rubber ring (325) through the outer discharge hole (320), the inner connecting hole (322), the annular cavity (323), and the outer connecting hole (324). The conical structure of the cut-off convex edge (319) abuts against the conical structure of the inner convex ring (311), the upper end surface of the movable disk (309) abuts against the lower wall of the upper ring (308), and the inner periphery of the convex ring abuts against the conical wall of the upper ring (308). The first channel (317) is connected to the corresponding upper through hole (316). When no air flows into the first air pipe (305), the lower end of the movable disc (309) contacts the upper end surface of the lower ring (310), and the first channel (317) is connected to the corresponding lower through hole (318); The lower end of the movable cover (312) is connected to a conical column (314), the outer periphery of the conical column (314) is a conical surface, and the diameter of the lower end of the conical surface of the conical column (314) is smaller than the diameter of the upper end thereof. The lower end of the conical column (314) is provided with a push column (326), and a plurality of pairs of guide holes (333) are provided on the middle septum ring (327). A moving rod (334) is provided in the guide hole (333), and each pair of moving rods (334) is connected to a lower The movable plate (335) and the lower movable plate (335) are located below the middle septum ring (327). Each pair of movable rods (334) is connected to an outward push block (336). The inner periphery of the outward push block (336) is formed with a conical arc wall (337). The conical surface of the conical column (314) acts on the inner periphery of the conical arc wall (337). A scraper (340) is provided in the outward push block (336). The scraper (340) is passed through the peripheral side of the lower end ring (331).

6. The PTFE printed circuit board hole burr removal device according to claim 5, characterized in that: The lower end of the lower end ring (331) is fixed with a lower cover plate (400), the lower wall of the lower cover plate (400) is formed with a lower extension tube (401), and the outer periphery of the lower extension tube (401) is formed with a plurality of umbrella-shaped rings (402), the diameter of the lower end of the umbrella-shaped ring (402) is greater than the diameter of the upper end thereof, and the outer diameter of the umbrella-shaped ring (402) increases from bottom to top, and the interior of the lower extension tube (401) is formed with an inner cavity (404), the lower end of the inner cavity (404) is formed with a plurality of umbrella-shaped rings (402), and the outer diameter of the umbrella-shaped ring (402) increases from bottom to top. The end is connected to an air outlet eye (405), and both ends of the air outlet eye (405) are respectively formed with a tapered hole, the diameter of the lower end of the tapered hole at the upper end is smaller than the diameter of the upper end, and the diameter of the lower end of the tapered hole at the lower end is larger than the diameter of the upper end, and the upper end of the lower extension tube (401) is connected to an air guide tube (403), one end of the air guide tube (403) is connected to the inner cavity (404), and the other end of the air guide tube (403) is connected to the lower through hole (318).

7. A method for removing burrs from holes in PTFE printed circuit boards, characterized in that: The device for removing burrs from holes in a PTFE printed circuit board as claimed in any one of claims 1 to 6 comprises the following steps: Step 01, placing the printed circuit board made of PTFE material to be processed on a positioning jig for removing burrs in the hole of the PTFE printed circuit board, and positioning the printed circuit board (6) by the positioning jig for removing burrs in the hole of the PTFE printed circuit board; Step 02: Importing a design drawing of a printed circuit board to be processed into a computer with an automatic control system, wherein the design drawing has geometric coordinate information, hole diameter, and hole depth of the printed circuit board; Step 03, start the automatic control system and control the two-dimensional linear XY translation stage to drive the lifting mechanism (1) to move so that the first removal member (3) is located directly above the positioning hole of the printed circuit board (6); Step 04, the automatic control system controls the first removal member (3) to move to each hole of the printed circuit board (6) along a predetermined trajectory according to the geometric coordinate information of the holes on the printed circuit board (6); Step 05, the automatic control system controls the lifting mechanism (1) to move downward according to the hole diameter and hole depth; If the diameter of the hole is greater than 2 mm, the lifting mechanism (1) drives the second removal member (4) to pass through the corresponding hole, and the scraper (340) and the rubber ring (325) are located below the corresponding hole; The automatic control system controls the air intake pump to move the scraper (340) out, and the first channel (317) is connected to the corresponding upper through hole (316); The automatic control system controls the dry ice to be sprayed outwards through the upper through hole (316) onto the inner wall of the hole, and allows the dry ice to contact the inner wall of the hole for more than 2 seconds; The automatic control system controls the lifting mechanism (1) to drive the rubber ring (325) to move upward, so that the rubber ring (325) removes burrs from the hole; The automatic control system controls the lifting mechanism (1) to drive the rubber ring (325) to move upward, and the rotating motor (20) drives the rotating shaft (21) and the scraper (340) to rotate, so that the scraper (340) removes the burrs in the hole again; If the diameter of the hole is less than 2 mm, the lifting mechanism (1) drives the lower extension tube (401) of the second removal member (4) to pass through the corresponding hole; The automatic control system controls the dry ice to be ejected through the air outlet (405) and fill the corresponding hole, and stops the introduction of the dry ice after the dry ice continues to be introduced for 2 seconds; The automatic control system controls the lifting mechanism (1) to drive the lower extension tube (401) to perform reciprocating lifting and lowering movements. During the movement, the outer edge of the umbrella ring (402) acts on the inner wall of the hole to remove burrs. Step 06, complete the removal of all burrs on the inner wall of the hole through the automatic control system, cancel the positioning of the printed circuit board (6) after the removal, and take out the printed circuit board (6).

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