A drilling machine for processing circuit boards with a deburring and chamfering structure.

Abstract

This invention discloses a drilling machine for circuit board processing with a deburring and chamfering structure, relating to the field of circuit board processing. It includes a base, a mounting base, a telescopic device, and a drilling mechanism. The mounting base is fixed above the base, and the telescopic device is located below the mounting base. The drilling mechanism is connected below the telescopic device and includes a connecting seat, a drill bit, a connecting rod, and a transmission seat. The connecting seat is installed below the telescopic device, and the transmission seat is located below the connecting seat. The connecting rod is connected below the transmission seat, and the lower end of the connecting rod is fixed to the drill bit. This drilling machine for circuit board processing with a deburring and chamfering structure provides support for the circuit board through the support base, preventing deformation during drilling. The horizontal position of the support base and the drill bit remains constant, ensuring that the drill bit and the support base are always relative. The circuit board can be moved and its drilling position adjusted via the mounting frame, ensuring stable drilling operations.

Description

Technical Field

[0001] This invention relates to the field of circuit board processing technology, specifically to a drilling machine for processing circuit boards with a deburring and chamfering structure. Background Technology

[0002] When processing circuit boards, holes need to be made on the circuit boards to facilitate their later installation and fixation. Holes are drilled on the circuit boards using a drilling machine. During the drilling process, the circuit boards need to be positioned, and then the drilling machine controls the movement of the drill bit to complete the drilling.

[0003] Application number CN202311642170.5, disclosed on April 5, 2024, discloses an intelligent circuit board drilling device, including a base, a drill module fixedly mounted on the base, a positioning component slidably connected to the base, a fixing component slidably connected to the positioning component, and a laser module connected to the base via a support, with the central axis of the laser module coinciding with the central axis of the drill bit on the drill module. The fixing component is located between the laser module and the base. This invention, by incorporating a laser module, assists the operator in detecting whether the drill rod is installed vertically when changing or installing it, thus preventing issues caused by non-vertical installation. During the drilling process, the drill rod experiences resistance, resulting in an excessively large hole diameter or drill rod breakage. This method also allows for timely inspection during the initial drilling process to check if the drill bit at the laser module has deviated due to previous operation. A PCB circuit board processing drilling device, disclosed in application number CN202311550572.2 on January 2, 2024, includes a frame, a movable platform, a drilling mechanism, and a support mechanism. The movable platform is mounted on the frame and is used to move the circuit board horizontally. The drilling mechanism, also mounted on the frame, includes a drill bit that can be raised and lowered vertically, used to drill holes in the circuit board on the movable platform. The support mechanism is mounted on the frame and located directly below the drill bit. It supports the drilling position on the circuit board. The support mechanism has clearance holes to avoid the drill bit. This PCB circuit board processing drilling device can support different types of circuit boards without adjustment, preventing interference between the bearing surface and the drill bit, and is easy to operate. A circuit board processing drilling device disclosed in application number CN202322121775.1 on March 12, 2024, includes a device body. The device body includes a placement platform, which has a slide groove and a support frame. Support legs are located below the placement platform. The slide groove contains... The device includes a sliding rod with a slider mounted on its outer sleeve. An operating plate is mounted on the slider. A pointer is located on the left side of the operating plate, and an extension buckle is located at the front end of the operating plate. A bidirectional lead screw is located inside the extension buckle. A motor is located at the left end of the bidirectional lead screw, and a first clamping plate is mounted on the bidirectional lead screw. A damping column is located on the inner wall of the first clamping plate, and a spring is mounted on the damping column. This design provides buffer protection for the circuit board during the limiting process, preventing damage to the circuit board due to compression during the limiting process. It also controls the drilling depth of the drill body, increasing the stability and safety of the device and preventing drill bit breakage caused by vibration during drilling.

[0004] Currently, drilling machines typically adjust the drilling position by moving the drill bit horizontally. After adjusting the drill bit position, the circuit board is suspended below to allow space for the drill bit to move. While this method allows for flexible adjustment of the drilling position, the circuit board is prone to deformation and damage during drilling due to the suspended position and the pressure from the drill bit. Furthermore, burrs on the surface of the drilled hole sometimes require further polishing, reducing the drilling quality of the device. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling machine for processing circuit boards with a deburring and chamfering structure, in order to solve the problems mentioned in the background art. In current drilling machines, the drilling position is generally adjusted by moving the horizontal position of the drill bit. After adjusting the position of the drill bit, the circuit board is suspended below to provide space for the drill bit to move. Although the drill bit can be flexibly adjusted in this way, the circuit board is easily deformed and damaged by the pressure of the drill bit during drilling because the circuit board is suspended below. In addition, the burrs on the surface of the hole sometimes need to be further polished after drilling.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drilling machine for processing circuit boards with a deburring and chamfering structure, comprising a base, a mounting base, a telescopic device, and a drilling mechanism. The mounting base is fixed above the base, and a telescopic device is disposed below the mounting base. A drilling mechanism is connected below the telescopic device. The drilling mechanism includes a connecting seat, a drill bit, a connecting rod, and a transmission seat. The connecting seat is installed below the telescopic device, and a transmission seat is disposed below the connecting seat. A connecting rod is connected below the transmission seat, and a drill bit is fixed to the lower end of the connecting rod. The rotation of the drill bit is controlled by the transmission seat. A deburring mechanism is disposed above the drill bit, and a support seat is disposed below the drill bit. The support seat is fixed above the base and is electrically connected. The road slab provides support. An installation frame is provided on the outer side of the support base, and a positioning seat is provided on the inner side of the installation frame. The positioning seat and the installation frame form a horizontal sliding structure. A second spring is fixed on the outer side of the positioning seat, and four sets of positioning seats are provided on the inner side of the installation frame. The bottom of the positioning seat has an "L" shaped structure design. The upper surface of the bottom of the positioning seat is flush with the upper surface of the support base. First installation blocks are provided on the left and right sides of the installation frame, and second installation blocks are nested on the outer side of the first installation blocks. The first and second installation blocks form a telescopic structure. A fixing seat is provided at the outer end of the second installation block, and the fixing seat is fixed above the base. The second installation block and the fixing seat form a front-to-back sliding structure.

[0007] To further optimize this technical solution, the diameter of the connecting rod is smaller than the diameter of the drill bit, and a connector is fixed at the upper end of the connecting rod. The connector and the transmission seat form a concave-convex fit structure, and a through-hole is provided inside the connector. A locking element is threaded inside the transmission seat, and the locking element passes through the through-hole to lock the connection between the connector and the transmission seat.

[0008] To further optimize this technical solution, the deburring mechanism includes a chamfering and grinding block and a slider;

[0009] The chamfering grinding block is fitted onto the outside of the connecting rod, and the top of the chamfering grinding block has an inclined structure design;

[0010] The slider is fixed to the inside of the chamfering and grinding block, and the slider and the connecting rod form an up-and-down sliding structure.

[0011] To further optimize this technical solution, a protective cover is provided on the outside of the drill bit, and a sliding rod is fixed above the protective cover. The upper end of the sliding rod passes through the connecting seat and the connecting seat to form an up-and-down sliding structure. A first spring is provided on the outside of the sliding rod, and the lower end of the protective cover is located below the drill bit.

[0012] To further optimize this technical solution, the middle part of the support base is designed as a through structure, and a debris collection mechanism is provided below the support base.

[0013] To further optimize this technical solution, the debris collection mechanism includes a connecting cover, a dust collection mechanism, and a dust collection bag;

[0014] The connecting cover is fixed to the bottom of the support base;

[0015] The dust extraction mechanism, installed inside the connecting cover, sucks up debris from the support base;

[0016] The dust collection bag is detachably installed below the connecting cover, and the dust collection bag has a breathable structure design.

[0017] To further optimize this technical solution, the first mounting block and the second mounting block are symmetrically arranged about the center line of the mounting frame, and the outer end of the second mounting block has an inverted "L" shaped structure design.

[0018] To further optimize this technical solution, limit mechanisms are provided inside both the first mounting block and the second mounting block to limit the movement of the first mounting block within the second mounting block and the movement of the second mounting block within the fixed base.

[0019] To further optimize this technical solution, the limiting mechanism includes a first limiting block, a fourth spring, a movable plate, a second limiting block, and a control mechanism;

[0020] The first limiting block is disposed at the outer end of the first mounting block, and the first limiting block and the first mounting block form an up-and-down sliding structure;

[0021] The fourth spring, fixed below the first limiting block, provides an upward thrust to the first limiting block;

[0022] The movable plate is set inside the second mounting block and between the second mounting block to form an up-and-down sliding structure, and the movable plate is located above the first limiting block;

[0023] The second limiting block is fixed to the left end of the movable plate, and the upper end of the second limiting block passes through the upper surface of the second mounting block and is connected to the fixed base to limit the movement of the second mounting block.

[0024] The control mechanism is connected to the first limit block to control the movement of the first limit block and release its limiting effect.

[0025] To further optimize this technical solution, the control mechanism includes a connector, a third spring, and a control rope;

[0026] The connector is fixed to the end of the first mounting block, and the connector is located inside the mounting frame and between the mounting frame to form an up-and-down sliding structure;

[0027] The third spring, fixed below the connector, provides upward thrust to the connector;

[0028] The control rope is fixed below the first limit block, and the inner end of the control rope passes through the connector and is connected to the mounting frame.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) The support base provides support for the circuit board to prevent deformation of the circuit board during drilling. The horizontal position of the support base and the drill bit remains unchanged, so that the drill bit and the support base are always relative. The circuit board can be moved by the mounting frame to adjust the drilling position of the circuit board, thus ensuring the stability of subsequent drilling.

[0031] (2) The chamfering grinding block can remove burrs and chamfer the circuit board after drilling. The chamfering grinding block can rotate with the drill bit. After the drill bit is disassembled, the chamfering grinding block can be removed from the connecting rod, so that the chamfering grinding block can be disassembled and replaced to improve the drilling quality.

[0032] (3) The protective cover can protect the drilling position and also provide a pressure limit effect for the circuit board. With the dust collection mechanism inside the connecting cover, the dust generated during the drilling process can be collected to avoid the drilling from polluting the surrounding working environment.

[0033] (4) The positioning seat can provide support for the circuit board, and the positioning seat can be moved and controlled by the mounting frame to adjust the drilling position of the circuit board. The mounting frame can be adjusted in position by the sliding connection between the first mounting block and the second mounting block and the fixed seat.

[0034] (5) The mounting frame can be positioned by setting the first limit block and the second limit block, and the first limit block and the second limit block can be moved by lifting the mounting frame to release the limiting effect. The circuit board can also be lifted from the support base for easy movement and adjustment. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0036] Figure 2 This is a side view of the structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the three-dimensional structure of the protective cover of the present invention;

[0038] Figure 4 This is a schematic diagram of the main structure of the drill bit of the present invention;

[0039] Figure 5 This is a side sectional view of the transmission seat structure of the present invention;

[0040] Figure 6 This is a top view of the mounting frame structure of the present invention;

[0041] Figure 7 This is a schematic diagram of the main cross-sectional structure of the support base of the present invention;

[0042] Figure 8 This is a schematic diagram of the main cross-sectional structure of the second mounting block of the present invention;

[0043] Figure 9 This is a schematic diagram of the main cross-sectional structure of the first mounting block of the present invention;

[0044] Figure 10 This is a side sectional view of the first mounting block of the present invention.

[0045] In the diagram: 1. Base; 2. Mounting seat; 3. Expansion joint; 4. Connecting seat; 5. Drill bit; 6. Connecting rod; 7. Connecting joint; 8. Transmission seat; 9. Through port; 10. Locking element; 11. Chamfering grinding block; 12. Slider; 13. Protective cover; 14. Slide rod; 15. First spring; 16. Support seat; 17. Connecting cover; 18. Dust collection mechanism; 19. Dust collection bag; 20. Mounting frame; 21. Positioning seat; 22. Second spring; 23. First mounting block; 24. Second mounting block; 25. Fixed seat; 26. Connector; 27. Third spring; 28. First limiting block; 29. ​​Fourth spring; 30. Control rope; 31. Movable plate; 32. Second limiting block. Detailed Implementation

[0046] Please see Figures 1-10 The present invention provides the following technical solution: a drilling machine for processing circuit boards with a deburring and chamfering structure, including a base 1, a mounting base 2, a telescopic device 3 and a drilling mechanism. The mounting base 2 is fixed above the base 1, and the telescopic device 3 is provided below the mounting base 2, and the drilling mechanism is connected below the telescopic device 3.

[0047] Example 1:

[0048] The invention provides a technical solution, disclosing a drilling mechanism including a connecting seat 4, a drill bit 5, a connecting rod 6, and a transmission seat 8. The connecting seat 4 is installed below the telescopic device 3, and the transmission seat 8 is provided below the connecting seat 4. The connecting rod 6 is connected to the lower part of the transmission seat 8, and the drill bit 5 is fixed to the lower end of the connecting rod 6. The rotation of the drill bit 5 is controlled by the transmission seat 8. A deburring mechanism is provided above the drill bit 5, and a support seat 16 is provided below the drill bit 5. The support seat 16 is fixed above the base 1 to provide support for the circuit board. A mounting frame 20 is provided on the outer side of the support seat 16, and a positioning seat 21 is provided on the inner side of the mounting frame 20. The positioning seat 21 and the mounting frame 20 form a connection. The mounting frame 20 has a horizontal sliding structure. A second spring 22 is fixed on the outside of the positioning seat 21. Four sets of positioning seats 21 are arranged inside the mounting frame 20. The bottom of the positioning seat 21 is designed with an "L" shape. The upper surface of the bottom of the positioning seat 21 is flush with the upper surface of the support seat 16. A first mounting block 23 is arranged on the left and right sides of the mounting frame 20. A second mounting block 24 is nested on the outside of the first mounting block 23. The first mounting block 23 and the second mounting block 24 form a telescopic structure. A fixed seat 25 is arranged at the outer end of the second mounting block 24. The fixed seat 25 is fixed above the base 1. The second mounting block 24 and the fixed seat 25 form a front and rear sliding structure.

[0049] In use, the circuit board to be drilled can be placed inside the positioning seat 21. The top of the positioning seat 21 can be set to be inclined to facilitate the placement of the circuit board. The positioning seat 21, together with the second spring 22, can clamp and position the circuit board. At the same time, the support seat 16 provides support for the drilling position of the circuit board. Then, the drill bit 5 is controlled to move downward by the telescopic device 3, and the transmission seat 8 drives the drill bit 5 to rotate, so as to drill the circuit board. When adjusting the drilling position, the positioning seat 21 and the circuit board can be moved by the movement control of the mounting frame 20 to adjust the drilling position of the circuit board.

[0050] Example 2:

[0051] Based on Embodiment 1, the diameter of the connecting rod 6 is smaller than the diameter of the drill bit 5, and a mating joint 7 is fixed to the upper end of the connecting rod 6. The mating joint 7 and the transmission seat 8 form a concave-convex fit structure, and a through-hole 9 is provided inside the mating joint 7. A locking member 10 is threaded inside the transmission seat 8, and the locking member 10 passes through the through-hole 9 to lock the connection between the mating joint 7 and the transmission seat 8. The burr removal mechanism includes a chamfering grinding block 11 and a slider 12. The chamfering grinding block 11 is sleeved on the outside of the connecting rod 6, and the upper part of the chamfering grinding block 11 has an inclined structure design. The slider 12 is fixed on the inside of the chamfering grinding block 11, and the slider 12 and the connecting rod 6 form an up-and-down sliding structure. An anti-burr is provided on the outside of the drill bit 5. The protective cover 13 has a fixed sliding rod 14 on its upper part. The upper end of the sliding rod 14 passes through the connecting seat 4 to form an up-and-down sliding structure. A first spring 15 is provided on the outside of the sliding rod 14. The lower end of the protective cover 13 is located below the drill bit 5. The middle part of the support seat 16 has a through structure design. A debris collection mechanism is provided below the support seat 16. The debris collection mechanism includes a connecting cover 17, a dust suction mechanism 18, and a dust collection bag 19. The connecting cover 17 is fixed below the support seat 16. The dust suction mechanism 18 is installed inside the connecting cover 17 to suck up the debris inside the support seat 16. The dust collection bag 19 is detachably installed below the connecting cover 17 and has a breathable structure design.

[0052] During drilling, after the drill bit 5 drills through the circuit board, it continues to move the chamfering grinding block 11 downwards, allowing the chamfering grinding block 11 to deburr and chamfer the hole, improving the hole quality. The chamfering grinding block 11 rotates synchronously with the drill bit 5 via the slider 12, eliminating the need for an additional power source. When the chamfering grinding block 11 needs to be disassembled later, the locking member 10 can be rotated first to pull it out of the through-hole 9. Then, the connector 7 can be removed from the transmission seat 8, and the chamfering grinding block 11 can be removed from... The connecting rod 6 can be slid out. When drilling, the protective cover 13 contacts the circuit board before the drill bit 5 contacts the circuit board to block the drilling debris. At the same time, the protective cover 13 provides downward pressure to the circuit board and provides a positioning effect for the circuit board. The debris generated during drilling can fall into the dust collection bag 19 through the connecting cover 17. At the same time, the dust collection mechanism 18 can be activated to generate suction in the support base 16, which can suck the debris around the hole into the dust collection bag 19, improving the treatment effect of the debris.

[0053] Example 3:

[0054] Based on Embodiment 1, a first mounting block 23 and a second mounting block 24 are symmetrically arranged about the center line of the mounting frame 20. The outer end of the second mounting block 24 has an inverted "L" shape. Limiting mechanisms are provided inside both the first mounting block 23 and the second mounting block 24 to limit the movement of the first mounting block 23 within the second mounting block 24 and the movement of the second mounting block 24 within the fixed base 25. The limiting mechanism includes a first limiting block 28, a fourth spring 29, a movable plate 31, a second limiting block 32, and a control mechanism. The first limiting block 28 is located at the outer end of the first mounting block 23, and the first limiting block 28 and the first mounting block 23 form an up-and-down sliding structure. The fourth spring 29 is fixed below the first limiting block 28 to provide an upward thrust to the first limiting block 28. The movable plate 31 is located inside the second mounting block 24. The two sides form a sliding structure, and the movable plate 31 is located above the first limiting block 28. The second limiting block 32 is fixed to the left end of the movable plate 31, and the upper end of the second limiting block 32 passes through the upper surface of the second mounting block 24 and is connected to the fixed seat 25 to limit the movement of the second mounting block 24. The control mechanism is connected to the first limiting block 28 to control the movement of the first limiting block 28 and release its limiting effect. The control mechanism includes a connector 26, a third spring 27 and a control rope 30. The connector 26 is fixed to the end of the first mounting block 23, and the connector 26 is located inside the mounting frame 20 and forms a sliding structure between the connector 26 and the mounting frame 20. The third spring 27 is fixed below the connector 26 to provide an upward thrust to the connector 26. The control rope 30 is fixed below the first limiting block 28, and the inner end of the control rope 30 passes through the connector 26 and is connected to the mounting frame 20.

[0055] In the default state, the first limiting block 28 and the second limiting block 32 are in the extended state, and the position of the mounting frame 20 remains stable. When it is necessary to adjust the position of the mounting frame 20 and the circuit board, the mounting frame 20 can be pulled upward first, causing the connector 26 to compress the third spring 27 and move. At the same time, the mounting frame 20 will drive the circuit board upward through the positioning seat 21, causing it to disengage from the support seat 16. Simultaneously, the control rope 30 is pulled, causing the first limiting block 28 to move downward, releasing the pressure of the first limiting block 28 on the movable plate 31. At the same time, the movable plate 31 will move downward, driving the second limiting block 32 to move, releasing the pressure of the second limiting block 32. 2. The connection between the mounting frame 20 and the fixed base 25 is established. At this time, the second mounting block 24 can move within the fixed base 25, and the first mounting block 23 can also move within the second mounting block 24. The positions of the mounting frame 20 and the circuit board can be adjusted. After the adjustment is completed, the mounting frame 20 is lowered, causing it to move downwards. The circuit board falls onto the support base 16. At the same time, the pulling effect of the control rope 30 is released, and the first limiting block 28 moves upwards under the action of the fourth spring 29, pushing the movable plate 31 upwards and causing the second limiting block 32 to extend out, limiting the positions of the first mounting block 23 and the second mounting block 24 to maintain the stability of the circuit board during subsequent processing.

[0056] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A drilling machine for processing circuit boards with a deburring and chamfering structure, comprising a base (1), a mounting base (2), a telescopic device (3) and a drilling mechanism, wherein the mounting base (2) is fixed above the base (1), and the telescopic device (3) is provided below the mounting base (2), and the drilling mechanism is connected below the telescopic device (3); Its features are: The drilling mechanism includes a connecting seat (4), a drill bit (5), a connecting rod (6), and a transmission seat (8). The connecting seat (4) is installed below the telescopic device (3), and the transmission seat (8) is provided below the connecting seat (4). The connecting rod (6) is connected to the lower part of the transmission seat (8), and the drill bit (5) is fixed at the lower end of the connecting rod (6). The rotation of the drill bit (5) is controlled by the transmission seat (8). A deburring mechanism is provided above the drill bit (5), and a support seat (16) is provided below the drill bit (5). A support base (16) is fixed above the base (1) to provide support for the circuit board. A mounting frame (20) is provided on the outer side of the support base (16), and a positioning seat (21) is provided on the inner side of the mounting frame (20). The positioning seat (21) and the mounting frame (20) form a horizontal sliding structure. A second spring (22) is fixed on the outer side of the positioning seat (21), and four sets of positioning seats (21) are provided on the inner side of the mounting frame (20). The bottom of the positioning seat (21) is designed with an "L" shape. The bottom upper surface of the mounting frame (20) is flush with the upper surface of the support base (16). The left and right sides of the mounting frame (20) are provided with first mounting blocks (23), and the outer side of the first mounting blocks (23) is nested with second mounting blocks (24). The first mounting blocks (23) and the second mounting blocks (24) form a telescopic structure. The outer end of the second mounting block (24) is provided with a fixing seat (25), and the fixing seat (25) is fixed above the base (1). The second mounting block (24) and the fixing seat (25) form a front-to-back structure. The sliding structure has a connecting rod (6) with a diameter smaller than that of the drill bit (5), and a connector (7) is fixed at the upper end of the connecting rod (6). The connector (7) and the transmission seat (8) form a convex-concave fit structure. The connector (7) has an opening (9) inside. The transmission seat (8) has a locking member (10) threaded inside. The locking member (10) passes through the opening (9) to lock the connection between the connector (7) and the transmission seat (8). The deburring mechanism includes a chamfering grinding block (11) and a slider (12). The chamfering grinding block (11) is fitted on the outside of the connecting rod (6), and the chamfering grinding block (11) has an inclined structure design on the top. The slider (12) is fixed on the inside of the chamfering and grinding block (11), and the slider (12) and the connecting rod (6) form an up-and-down sliding structure.

2. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 1, characterized in that: The drill bit (5) is provided with a protective cover (13) on the outside, and a slide rod (14) is fixed above the protective cover (13). The upper end of the slide rod (14) passes through the connecting seat (4) and the connecting seat (4) to form an up-and-down sliding structure. A first spring (15) is provided on the outside of the slide rod (14). The lower end of the protective cover (13) is located below the drill bit (5).

3. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 2, characterized in that: The support base (16) has a through-type structure in the middle, and a debris collection mechanism is provided below the support base (16).

4. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 3, characterized in that: The debris collection mechanism includes a connecting cover (17), a dust collection mechanism (18), and a dust collection bag (19). The connecting cover (17) is fixed below the support base (16); A dust extraction mechanism (18) is installed inside the connecting cover (17) to extract debris from the support base (16); The dust collection bag (19) is detachably installed below the connecting cover (17), and the dust collection bag (19) is designed with a breathable structure.

5. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 4, characterized in that: The first mounting block (23) and the second mounting block (24) are symmetrically arranged about the center line of the mounting frame (20), and the outer end of the second mounting block (24) is designed with an inverted "L" shape.

6. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 5, characterized in that: Limiting mechanisms are provided inside the first mounting block (23) and the second mounting block (24) to limit the movement of the first mounting block (23) within the second mounting block (24) and the movement of the second mounting block (24) within the fixed seat (25).

7. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 6, characterized in that: The limiting mechanism includes a first limiting block (28), a fourth spring (29), a movable plate (31), a second limiting block (32), and a control mechanism; The first limiting block (28) is disposed at the outer end of the first mounting block (23), and the first limiting block (28) and the first mounting block (23) form an up-and-down sliding structure; The fourth spring (29) is fixed below the first limiting block (28) to provide an upward thrust to the first limiting block (28); The movable plate (31) is set inside the second mounting block (24) and between the second mounting block (24) to form an up-and-down sliding structure, and the movable plate (31) is located above the first limiting block (28); The second limiting block (32) is fixed to the left end of the movable plate (31), and the upper end of the second limiting block (32) passes through the upper surface of the second mounting block (24) and is connected to the fixed seat (25) to limit the movement of the second mounting block (24); The control mechanism is connected to the first limit block (28) to control the movement of the first limit block (28) and release its limiting effect.

8. A drilling machine for processing circuit boards with a deburring and chamfering structure according to claim 7, characterized in that: The control mechanism includes a connector (26), a third spring (27), and a control rope (30); The connector (26) is fixed to the end of the first mounting block (23), and the connector (26) is located inside the mounting frame (20) and between the mounting frame (20) to form an up-and-down sliding structure; The third spring (27) is fixed below the connector (26) to provide an upward thrust to the connector (26); The control rope (30) is fixed below the first limit block (28), and the inner end of the control rope (30) passes through the connector (26) and is connected to the mounting frame (20).

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