A grinding device and method for removing burrs from the outer port of a blind hole in a circuit board

Abstract

The present invention discloses a grinding device and method for removing burrs from the outer port of a blind hole in a circuit board. The present invention relates to the technical field of grinding off burrs at the outer port of a blind hole in a circuit board. The device comprises a guide column, a mounting seat and a lifting cylinder fixedly arranged on a bottom plate from left to right, and a positioning groove is provided on the top surface of the mounting seat; two grinding mechanisms are arranged on the lifting plate, and the grinding mechanism on the left side comprises a center rod welded on the bottom surface of the lifting plate, a sleeve welded on the outer cylindrical surface of the center rod, and a driven gear rotatably mounted on the outside of the sleeve, and a plugging head is fixed on the bottom of the center rod; the driven gear of the grinding mechanism on the left side is meshed with the driven gear of the grinding mechanism on the right side, and a driving assembly is also connected to the driven gear of the grinding mechanism on the right side. The beneficial effects of the present invention are: greatly improving the grinding quality and greatly improving the grinding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of grinding away burrs at the outer port of a blind hole in a circuit board, in particular to a grinding device and a method for removing burrs at the outer port of a blind hole in a circuit board. Background Art

[0002] The circuit board is used to be installed in a control chassis to control the normal operation of all instruments or meters in the chassis. The structure of the circuit board 1 produced by a workshop is as follows Figure 1~Figure 3 As shown, two vertically arranged blind holes 2 are provided on the top surface of the circuit board 1. The two blind holes 2 are arranged opposite to each other on the left and right sides. The two blind holes 2 are used to accommodate electronic components. A large number of burrs 3 turned outward are distributed on the circumference of the outer ends of the two blind holes 2. The existence of these burrs 3 undoubtedly affects the installation of electronic components.

[0003] Therefore, before using these circuit boards 1 , all burrs 3 at the outer ends of the two blind holes 2 on the circuit board 1 need to be polished off, so that the electronic components can be better installed in the blind holes 2 .

[0004] In the workshop, the worker polished off the burrs 3 at the outer ports of the two blind holes 2 in the circuit board 1 by:

[0005] S1. A worker fixes the circuit board 1 to be polished on a workbench by a fixture;

[0006] S2, the worker operates the grinding equipment to gradually grind away the burrs 3 by the grinding disc on the grinding equipment, and after grinding, a usable circuit board 1 can be obtained;

[0007] S3. The worker repeats the operations of steps S1 to S2 to continuously grind the burrs at the outer ends of the blind holes 2 of the multiple circuit boards 1.

[0008] However, although the existing grinding equipment can grind away the burrs 3 at the outer ports of the blind holes 2 of the circuit board 1 by means of a grinding disc, the following technical defects still exist in the technology:

[0009] I. When the grinding disc of the grinding equipment is grinding the burr 3, part of the burr ground off by the grinding disc will splash into the blind hole 2. The splashing direction of the burr 3 is as follows: Figure 3 As shown by the middle arrow, the inner wall of the blind hole 2 is scratched, while the process requires that the inner wall of the blind hole 2 should not have any scratches; therefore, when the burr 3 is directly polished by the polishing equipment, the production quality of the circuit board 1 is greatly reduced, and there is a technical defect of low polishing quality. In addition, after polishing, the burr 3 entering the blind hole 2 must be manually cleaned, which undoubtedly increases the polishing process and reduces the burr polishing efficiency.

[0010] II. Only the burr 3 at the outer end of one blind hole 2 can be polished by one polishing device, so it takes a long time to polish all the burrs 3 at the outer ends of two blind holes 2 on a circuit board 1, thereby further reducing the polishing efficiency of the burrs.

[0011] Therefore, there is an urgent need for a grinding device and method that can greatly improve the grinding quality and the grinding efficiency. Summary of the invention

[0012] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a grinding device and method for removing burrs from the outer ports of blind holes in circuit boards, which greatly improves the grinding quality and the grinding efficiency.

[0013] The object of the present invention is achieved by the following technical solutions: A grinding device for removing burrs from the outer port of a blind hole of a circuit board, comprising a guide column, a mounting seat and a lifting cylinder fixedly arranged on a bottom plate from left to right, a positioning groove is provided on the top surface of the mounting seat, the positioning groove matches the outer contour of the circuit board, a lifting plate is fixedly arranged on the piston rod of the lifting cylinder, and the left end of the lifting plate is slidably sleeved on the guide column;

[0014] The lifting plate is provided with two grinding mechanisms, and the grinding mechanism on the left side includes a center rod welded on the bottom surface of the lifting plate, a sleeve welded on the outer cylindrical surface of the center rod, and a driven gear rotatably mounted on the outside of the sleeve. A sealing head is fixedly provided at the bottom of the center rod, and the diameter of the sealing head is equal to the diameter of the blind hole in the circuit board. A feed cylinder is fixedly provided on the bottom surface of the driven gear, and the piston rod of the feed cylinder extends downward, and an L-plate is fixedly provided on the extended end, and a driving shaft and a driven shaft are rotatably mounted in the L-plate and at the upper and lower ends thereof, respectively, the right end portion of the driving shaft is connected to the output shaft of the grinding motor, the left end portion of the driving shaft is connected to a driving pulley, and the left end portion of the driven shaft is connected to a driven pulley, a transmission belt is installed between the driven pulley and the driving pulley, and a vertically arranged grinding disc is installed on the right end portion of the driven shaft;

[0015] The driven gear of the grinding mechanism on the left is meshed with the driven gear of the grinding mechanism on the right, and a driving assembly is also connected to the driven gear of the grinding mechanism on the right.

[0016] A left bracket and a right bracket are fixed on the top surface of the base plate, respectively located on the left and right sides of the mounting seat, the guide column is fixed on the top surface of the left bracket, the lifting cylinder is fixed on the bottom surface of the right bracket, and the piston rod of the lifting cylinder penetrates the bottom surface of the right bracket upward, and a rod is fixed on the extending end, and the rod is fixed on the right end portion of the lifting plate.

[0017] The center rod is coaxially arranged with the plugging head.

[0018] A ball bearing is fixedly sleeved on the outer side of the sleeve, and the driven gear is sleeved on the outer ring of the ball bearing.

[0019] An arch frame is fixedly arranged on the right end surface of the L plate, and the grinding motor is fixedly arranged on the right end surface of the arch frame.

[0020] The driving assembly includes a driving motor fixed on the top surface of the lifting plate, the output shaft of the driving motor passes through the lifting plate downward, and a driving gear is fixed on the extending end, and the driving gear is meshed with the driven gear of the grinding mechanism on the right side.

[0021] The grinding device also includes a controller, which is electrically connected to the lifting cylinder, the feeding cylinder, the driving motor and the grinding motor via a signal line.

[0022] A grinding method for removing burrs from the outer port of a blind hole of a circuit board comprises the following steps:

[0023] S1. Positioning and installation of circuit boards: A worker takes out a circuit board from the material basket and inserts the circuit board into the positioning groove of the mounting seat. Since the positioning groove matches the outer contour of the circuit board, the positioning of the circuit board is achieved. At this time, the two blind holes in the circuit board are respectively located directly below the plugging heads of the two grinding mechanisms, and at the same time, the left edges of the two blind holes are respectively located directly below the grinding discs of the two grinding mechanisms;

[0024] S2. Control the piston rod of the lifting cylinder to retract downward, the piston rod drives the rod to move downward, the rod drives the lifting plate to move downward, the lifting plate moves downward along the guide column, and at the same time, the lifting plate drives the driving assembly and the two grinding mechanisms thereon to move downward synchronously, the center rod and the plugging head of the grinding mechanism move downward synchronously, and when the piston rod of the lifting cylinder is fully retracted, the plugging heads of the two grinding mechanisms are respectively embedded in the two blind holes of the circuit board, and the top surface of the plugging head is just flush with the top surface of the circuit board;

[0025] S3. The worker controls the grinding motors of the two grinding mechanisms to start, the grinding motor drives the driving shaft to rotate, the driving shaft drives the driving pulley to rotate, the driving pulley drives the driven pulley to rotate via the transmission belt, the driven pulley drives the driven shaft to rotate, and the driven shaft drives the grinding disc to rotate around its own axis;

[0026] S4, the piston rods of the feed cylinders of the two grinding mechanisms are controlled to extend downward, the piston rods drive the L plate to move downward, the L plate drives the rotating grinding disc to move downward synchronously, and the grinding disc moves toward the left edge of the blind hole. When the piston rods of the feed cylinders are fully extended, the grinding disc just grinds off the burrs on the left edge of the blind hole;

[0027] S5, control the driving motor of the driving assembly to start, the driving motor drives the driving gear to rotate, the driving gear drives the driven gear of the grinding mechanism on the right to rotate, the driven gear drives the driven gear of the grinding mechanism on the left to rotate, the two driven gears drive the feed cylinder, the L plate and the grinding disc to rotate synchronously, the grinding disc moves circumferentially around the axis of the center rod on the horizontal plane, and during the circumferential movement, the grinding disc gradually grinds the burrs at the outer port of the blind hole; when the grinding disc rotates °, the controller controls the driving motor to turn off, at this time, the two grinding discs respectively grind away all the burrs at the outer ports of the two blind holes;

[0028] S6. Removal of the polished circuit board: The worker first controls the polishing motor to turn off, and the grinding disc stops rotating around its own axis; then controls the piston rod of the feed cylinder to retract upward, and the piston rod drives the L plate and the grinding disc to move upward synchronously to reset the grinding disc; then controls the piston rod of the lifting cylinder to extend upward, and the piston rod drives the rod member to move upward, and the rod member drives the lifting plate to move upward, and the lifting plate drives the driving assembly and the two polishing mechanisms to move upward synchronously, and the center rod and the plugging head of the polishing mechanism move upward synchronously. When the plugging head is out of the blind hole, the worker removes the polished circuit board from the positioning groove of the mounting seat;

[0029] S7. The worker repeats the operations of steps S1 to S6 to continuously grind the burrs at the outer ports of the blind holes of multiple circuit boards.

[0030] The present invention has the following advantages: greatly improving the grinding quality and greatly improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of a circuit board;

[0032] Figure 2 for Figure 2 A top view of

[0033] Figure 3 for Figure 1 A partial enlarged view of part A;

[0034] Figure 4 It is a structural schematic diagram of the present invention;

[0035] Figure 5 for Figure 4 The main cross-sectional diagram of

[0036] Figure 6 This is the axonometric view of the mounting base;

[0037] Figure 7 for Figure 6 The main cross-sectional diagram of

[0038] Figure 8It is a structural schematic diagram of the grinding mechanism;

[0039] Fig. 9 for Figure 8 Schematic diagram of the connection between the center rod and the plugging head;

[0040] Fig.10 for Fig. 9 The main cross-sectional diagram of

[0041] Fig.11 for Figure 8 Schematic diagram of direction B;

[0042] Fig.12 is a schematic diagram of the structure of the drive component;

[0043] Fig.13 A schematic diagram for realizing the positioning of the circuit board;

[0044] Fig.14 A schematic diagram of a plugging head being embedded in a blind hole of a circuit board;

[0045] Fig.15 It is a schematic diagram of the rotation of the grinding disc;

[0046] Fig.16 The figure is a schematic diagram of a grinding wheel grinding away the burr on the left edge of a blind hole;

[0047] Fig.17 Schematic diagram for removing the polished circuit board;

[0048] In the figure:

[0049] 1-circuit board, 2-blind hole, 3-burr;

[0050] 4-base plate, 5-guide column, 6-mounting seat, 7-lifting cylinder, 8-positioning slot, 9-lifting plate, 10-grinding mechanism, 11-center rod, 12-sleeve, 13-driven gear, 14-blocking head, 15-feeding cylinder, 16-L plate, 17-driving shaft, 18-driven shaft, 19-grinding motor, 20-transmission belt, 21-grinding disc;

[0051] 22-driving assembly, 23-left bracket, 24-right bracket, 25-rod, 26-ball bearing, 27-driving motor, 28-driving gear. DETAILED DESCRIPTION

[0052] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0053] like Figure 4 to Figure 12As shown, a grinding device for removing burrs from the outer port of a blind hole in a circuit board comprises a guide column 5, a mounting seat 6 and a lifting cylinder 7 which are fixedly mounted on a base plate 4 from left to right in sequence. A positioning groove 8 is provided on the top surface of the mounting seat 6, and the positioning groove 8 matches the outer contour of the circuit board 1. A lifting plate 9 is fixedly mounted on the piston rod of the lifting cylinder 7, and the left end of the lifting plate 9 is slidably sleeved on the guide column 5.

[0054] The lifting plate 9 is provided with two grinding mechanisms 10. The grinding mechanism 10 on the left side includes a center rod 11 welded on the bottom surface of the lifting plate 9, a sleeve 12 welded on the outer cylindrical surface of the center rod 11, and a driven gear 13 rotatably mounted on the outside of the sleeve 12. A plugging head 14 is fixedly provided at the bottom of the center rod 11. The center rod 11 and the plugging head 14 are coaxially arranged. The diameter of the plugging head 14 is equal to the diameter of the blind hole 2 in the circuit board 1. A feed cylinder 15 is fixedly provided on the bottom surface of the driven gear 13. The piston rod of the feed cylinder 15 extends downward, and an L-plate 16 is fixed on the extended end. A driving shaft 17 and a driven shaft 18 are rotatably mounted in the L-plate 16 and at its upper and lower ends respectively. The right end of the driving shaft 17 is connected to the output shaft of the grinding motor 19, the left end of the driving shaft 17 is connected to a driving pulley, the left end of the driven shaft 18 is connected to a driven pulley, a transmission belt 20 is installed between the driven pulley and the driving pulley, and a vertically arranged grinding disc 21 is installed on the right end of the driven shaft 18.

[0055] The driven gear 13 of the grinding mechanism 10 on the left is meshed with the driven gear 13 of the grinding mechanism 10 on the right, and the driven gear 13 of the grinding mechanism 10 on the right is also connected to a driving assembly 22, the driving assembly 22 includes a driving motor 27 fixedly mounted on the top surface of the lifting plate 9, the output shaft of the driving motor 27 passes through the lifting plate 9 downward, and a driving gear 28 is fixedly mounted on the extending end, and the driving gear 28 is meshed with the driven gear 13 of the grinding mechanism 10 on the right.

[0056] A left bracket 23 and a right bracket 24 are fixedly provided on the top surface of the base plate 4, which are respectively located on the left and right sides of the mounting seat 6. The guide column 5 is fixedly provided on the top surface of the left bracket 23. The lifting cylinder 7 is fixedly provided on the bottom surface of the right bracket 24. The piston rod of the lifting cylinder 7 penetrates upward through the bottom surface of the right bracket 24, and a rod 25 is fixedly provided on the extending end. The rod 25 is fixedly provided on the right end portion of the lifting plate 9.

[0057] The outer sleeve of the sleeve 12 is fixed with a ball bearing 26, and the driven gear 13 is fixed on the outer ring of the ball bearing 26. An arch frame is fixed on the right end surface of the L plate 16, and the grinding motor 19 is fixed on the right end surface of the arch frame. The grinding device also includes a controller, which is electrically connected to the lifting cylinder 7, the feed cylinder 15, the drive motor 27 and the grinding motor 19 via a signal line. The worker can control the extension or retraction of the piston rod of the lifting cylinder 7 and the feed cylinder 15 through the controller, and can also control the start or shut down of the drive motor 27 and the grinding motor 19, which is convenient for the worker's operation and has the characteristics of high degree of automation.

[0058] A grinding method for removing burrs from the outer port of a blind hole of a circuit board comprises the following steps:

[0059] S1. Positioning and installation of circuit board 1: A worker takes out a circuit board 1 from a material basket. Figure 1~Figure 3 The circuit board 1 shown in the figure is embedded in the positioning groove 8 of the mounting seat 6. Since the positioning groove 8 matches the outer contour of the circuit board 1, the positioning of the circuit board 1 is achieved. Fig.13 As shown, at this time, the two blind holes 2 in the circuit board 1 are respectively located directly below the plugging heads 14 of the two grinding mechanisms 10, and at the same time, the left edges of the two blind holes 2 are respectively located directly below the grinding discs 21 of the two grinding mechanisms 10;

[0060] S2. The piston rod of the control lifting cylinder 7 is retracted downward, the piston rod drives the rod 25 to move downward, the rod 25 drives the lifting plate 9 to move downward, the lifting plate 9 moves downward along the guide column 5, and at the same time, the lifting plate 9 drives the driving assembly 22 and the two grinding mechanisms 10 thereon to move downward synchronously, the center rod 11 and the plugging head 14 of the grinding mechanism 10 move downward synchronously, and when the piston rod of the lifting cylinder 7 is fully retracted, the plugging heads 14 of the two grinding mechanisms 10 are respectively embedded in the two blind holes 2 of the circuit board 1, as shown in FIG. Fig.14 As shown, the top surface of the plugging head 14 is just flush with the top surface of the circuit board 1;

[0061] S3, the worker controls the grinding motors 19 of the two grinding mechanisms 10 to start, the grinding motors 19 drive the driving shaft 17 to rotate, the driving shaft 17 drives the driving pulley to rotate, the driving pulley drives the driven pulley to rotate via the transmission belt 20, the driven pulley drives the driven shaft 18 to rotate, the driven shaft 18 drives the grinding disc 21 to rotate around its own axis, and the rotation direction of the grinding disc 21 is as follows Fig.15 As indicated by the arrow;

[0062] S4, control the piston rods of the feed cylinders 15 of the two grinding mechanisms 10 to extend downward, the piston rods drive the L plate 16 to move downward, the L plate 16 drives the rotating grinding disc 21 to move downward synchronously, the grinding disc 21 moves toward the left edge of the blind hole 2, when the piston rod of the feed cylinder 15 is fully extended, the grinding disc 21 just grinds off the burrs on the left edge of the blind hole 2, as shown in FIG. Fig.16 As shown;

[0063] S5, the driving motor 27 of the control driving assembly 22 is started, the driving motor 27 drives the driving gear 28 to rotate, the driving gear 28 drives the driven gear 13 of the grinding mechanism 10 on the right to rotate, the driven gear 13 drives the driven gear 13 of the grinding mechanism 10 on the left to rotate, the two driven gears 13 drive the feed cylinder 15, the L plate 16 and the grinding disc 21 to rotate synchronously, the grinding disc 21 performs circumferential motion on the horizontal plane around the axis of the center rod 11, and during the circumferential motion, the grinding disc 21 gradually grinds the burrs at the outer end of the blind hole 2; when the grinding disc 21 rotates 180°, the controller controls the driving motor 27 to turn off, at which time, the two grinding discs 21 respectively grind away all the burrs at the outer ends of the two blind holes 2;

[0064] Among them, it can be known from steps S2 to S5 that the present grinding device only needs to control the piston rod of the lifting cylinder 7 to retract downward first, so that the plugging head 14 of the grinding mechanism 10 is embedded in the blind hole 2 to plug the blind hole 2; then control the piston rod of the feed cylinder 15 to extend downward, so that the grinding disc 21 in a rotating state grinds off the burrs on the left edge of the blind hole 2; finally, control the drive motor 27 of the drive assembly 22 to start, so that the grinding disc 21 grinds off all the burrs at the outer port of the blind hole 2, thereby grinding off all the burrs at the outer ports of the two blind holes 2. It can be seen that the present grinding device can grind off all the burrs at the outer ports of the two blind holes 2 of a circuit board 1 within the same time period, which greatly shortens the grinding time compared to the grinding method that requires one grinding after another by the grinding equipment in the workshop, thereby greatly improving the grinding efficiency of the burrs.

[0065] In addition, during the grinding process, since the plugging head 14 is always embedded in the blind hole 2, and the top surface of the plugging head 14 is just flush with the top surface of the circuit board 1, that is, the plugging head 14 blocks the burrs that are ground off from entering the blind hole 2. It can be seen that the grinding device has achieved the purpose of protecting the blind hole 2 very well, and effectively prevents the burrs that are ground off from scratching the inner wall of the blind hole 2, thereby greatly improving the grinding quality. In addition, since there are no burrs in the blind hole 2, there is no need for workers to subsequently clean the burrs in the blind hole 2, which saves the cleaning process, thereby further improving the grinding efficiency of the burrs.

[0066] S6. Removal of the polished circuit board 1: The worker first controls the polishing motor 19 to turn off, and the grinding disc 21 stops rotating around its own axis; then controls the piston rod of the feed cylinder 15 to retract upward, and the piston rod drives the L plate 16 and the grinding disc 21 to move upward synchronously to reset the grinding disc 21; then controls the piston rod of the lifting cylinder 7 to extend upward, and the piston rod drives the rod 25 to move upward, and the rod 25 drives the lifting plate 9 to move upward, and the lifting plate 9 drives the driving assembly 22 and the two polishing mechanisms 10 to move upward synchronously, and the center rod 11 and the plugging head 14 of the polishing mechanism 10 move upward synchronously. When the plugging head 14 is out of the blind hole 2, the worker removes the polished circuit board 1 from the positioning groove 8 of the mounting seat 6. The removal direction of the circuit board 1 is as follows: Fig.17 As indicated by the arrow;

[0067] S7 . The worker repeats the operations of steps S1 to S6 to continuously grind away the burrs at the outer ends of the blind holes 2 of the plurality of circuit boards 1 .

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grinding device for removing burrs from the outer port of a blind hole of a circuit board, characterized in that: It comprises a guide column (5), a mounting seat (6) and a lifting cylinder (7) which are fixedly mounted on a bottom plate (4) from left to right in sequence. A positioning groove (8) is provided on the top surface of the mounting seat (6). The positioning groove (8) matches the outer contour of the circuit board (1). A lifting plate (9) is fixedly mounted on the piston rod of the lifting cylinder (7). The left end of the lifting plate (9) is slidably sleeved on the guide column (5). The lifting plate (9) is provided with two grinding mechanisms (10), the grinding mechanism (10) located on the left side comprises a center rod (11) welded to the bottom surface of the lifting plate (9), a sleeve (12) welded to the outer cylindrical surface of the center rod (11), and a driven gear (13) rotatably mounted on the outside of the sleeve (12), a plugging head (14) is fixedly provided at the bottom of the center rod (11), and the diameter of the plugging head (14) is equal to the diameter of the blind hole (2) in the circuit board (1), and a feed oil cylinder (15) is fixedly provided on the bottom surface of the driven gear (13), and the feed oil cylinder (15) is fixedly provided on the bottom surface of the driven gear (13). The piston rod of the cylinder (15) extends downward, and an L-plate (16) is fixedly provided on the extended end. A driving shaft (17) and a driven shaft (18) are rotatably mounted in the L-plate (16) and at the upper and lower ends thereof, respectively. The right end of the driving shaft (17) is connected to the output shaft of the grinding motor (19), the left end of the driving shaft (17) is connected to a driving pulley, the left end of the driven shaft (18) is connected to a driven pulley, a transmission belt (20) is installed between the driven pulley and the driving pulley, and a vertically arranged grinding disc (21) is installed on the right end of the driven shaft (18); The driven gear (13) of the left grinding mechanism (10) is meshed with the driven gear (13) of the right grinding mechanism (10), and the driven gear (13) of the right grinding mechanism (10) is also connected to a driving assembly (22); The driving assembly (22) comprises a driving motor (27) fixedly mounted on the top surface of the lifting plate (9). The output shaft of the driving motor (27) passes through the lifting plate (9) downward, and a driving gear (28) is fixedly mounted on the extended end. The driving gear (28) meshes with a driven gear (13) of the grinding mechanism (10) on the right side.

2. A grinding device for removing burrs from the outer port of a blind hole of a circuit board according to claim 1, characterized in that: A left bracket (23) and a right bracket (24) are fixedly provided on the top surface of the bottom plate (4), which are respectively located on the left and right sides of the mounting seat (6); the guide column (5) is fixedly provided on the top surface of the left bracket (23); the lifting cylinder (7) is fixedly provided on the bottom surface of the right bracket (24); the piston rod of the lifting cylinder (7) penetrates upward through the bottom surface of the right bracket (24); and a rod (25) is fixedly provided on the extended end; the rod (25) is fixedly provided on the right end portion of the lifting plate (9).

3. A grinding device for removing burrs from the outer port of a blind hole of a circuit board according to claim 2, characterized in that: The central rod (11) and the plugging head (14) are coaxially arranged.

4. A grinding device for removing burrs from the outer port of a blind hole of a circuit board according to claim 3, characterized in that: A ball bearing (26) is fixedly sleeved on the outside of the sleeve (12), and the driven gear (13) is sleeved on the outer ring of the ball bearing (26).

5. A grinding device for removing burrs from the outer port of a blind hole of a circuit board according to claim 4, characterized in that: An arch frame is fixedly arranged on the right end surface of the L plate (16), and the grinding motor (19) is fixedly arranged on the right end surface of the arch frame.

6. A grinding device for removing burrs from the outer port of a blind hole of a circuit board according to claim 5, characterized in that: The grinding device also includes a controller, which is electrically connected to the lifting cylinder (7), the feeding cylinder (15), the driving motor (27) and the grinding motor (19) via signal lines.

7. A grinding method for removing burrs from the outer port of a blind hole in a circuit board, using the grinding device for removing burrs from the outer port of a blind hole in a circuit board as claimed in claim 6, characterized in that: It includes the following steps: S1. Positioning and installing the circuit board (1): A worker takes out a circuit board (1) from a material basket and inserts the circuit board (1) into the positioning groove (8) of the mounting seat (6). Since the positioning groove (8) matches the outer contour of the circuit board (1), the positioning of the circuit board (1) is achieved. At this time, the two blind holes (2) in the circuit board (1) are respectively located directly below the plugging heads (14) of the two grinding mechanisms (10). At the same time, the left edges of the two blind holes (2) are respectively located directly below the grinding discs (21) of the two grinding mechanisms (10); S2, the piston rod of the control lifting cylinder (7) is retracted downward, the piston rod drives the rod (25) to move downward, the rod (25) drives the lifting plate (9) to move downward, the lifting plate (9) moves downward along the guide column (5), and at the same time, the lifting plate (9) drives the driving assembly (22) and the two grinding mechanisms (10) thereon to move downward synchronously, the center rod (11) and the plugging head (14) of the grinding mechanism (10) move downward synchronously, and when the piston rod of the lifting cylinder (7) is completely retracted, the plugging heads (14) of the two grinding mechanisms (10) are respectively embedded in the two blind holes (2) of the circuit board (1), and the top surface of the plugging head (14) is just flush with the top surface of the circuit board (1); S3, the worker controls the grinding motors (19) of the two grinding mechanisms (10) to start, the grinding motors (19) drive the driving shaft (17) to rotate, the driving shaft (17) drives the driving pulley to rotate, the driving pulley drives the driven pulley to rotate via the transmission belt (20), the driven pulley drives the driven shaft (18) to rotate, and the driven shaft (18) drives the grinding disc (21) to rotate around its own axis; S4, controlling the piston rods of the feed cylinders (15) of the two grinding mechanisms (10) to extend downward, the piston rods drive the L-plate (16) to move downward, the L-plate (16) drives the grinding disc (21) in a rotating state to move downward synchronously, the grinding disc (21) moves toward the left edge of the blind hole (2), and when the piston rods of the feed cylinders (15) are fully extended, the grinding disc (21) just grinds away the burrs on the left edge of the blind hole (2); S5, the driving motor (27) of the control driving assembly (22) is started, the driving motor (27) drives the driving gear (28) to rotate, the driving gear (28) drives the driven gear (13) of the right grinding mechanism (10) to rotate, the driven gear (13) drives the driven gear (13) of the left grinding mechanism (10) to rotate, the two driven gears (13) drive the feed cylinder (15), the L plate (16) and the grinding disc (21) to rotate synchronously, the grinding disc (21) performs circumferential motion on the horizontal plane around the axis of the center rod (11), and during the circumferential motion, the grinding disc (21) gradually grinds the burrs at the outer end of the blind hole (2); when the grinding disc (21) rotates 180°, the controller controls the driving motor (27) to turn off, at which time, the two grinding discs (21) respectively grind away all the burrs at the outer ends of the two blind holes (2); S6. Removal of the polished circuit board (1): The worker first controls the polishing motor (19) to turn off, and the grinding disc (21) stops rotating around its own axis; then controls the piston rod of the feed cylinder (15) to retract upward, and the piston rod drives the L plate (16) and the grinding disc (21) to move upward synchronously, so that the grinding disc (21) is reset; then controls the piston rod of the lifting cylinder (7) to extend upward, and the piston rod drives the rod member (25) to move upward, and the rod member (25) drives the lifting plate (9) to move upward, and the lifting plate (9) drives the driving assembly (22) and the two polishing mechanisms (10) to move upward synchronously, and the center rod (11) and the plugging head (14) of the polishing mechanism (10) move upward synchronously. When the plugging head (14) is removed from the blind hole (2), the worker removes the polished circuit board (1) from the positioning groove (8) of the mounting seat (6); S7. The worker repeats the operations of steps S1 to S6 in this way, thereby continuously grinding away the burrs at the outer ends of the blind holes (2) of the plurality of circuit boards (1).

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