A circuit board drilling device with a crack prevention function

Abstract

The present invention discloses a circuit board drilling device with a crack prevention function, which relates to the technical field of circuit board drilling, and includes a workbench and a top plate. One side of the top of the workbench is fixed to the top plate by spot welding, and one side of the top plate is fixed to the first cover plate by spot welding; in the present invention, the third motor rotates to drive two movable rods to squeeze the clamping columns on the first slide plate and the second slide plate, improving the stability when the entire fourth motor drives the clamping columns to rotate. At the same time, the first runner and the second runner installed on the first slide plate and the second slide plate not only reduce the friction between the rotating clamping columns and the first slide plate and the second slide plate, but also drive the fans on one side of the first runner and the second runner to rotate through the rotating clamping columns, so that the waste chips generated when the entire punching drill bit drills the circuit board are timely blown away by the fans, preventing the waste chips from affecting the drilling of the entire circuit board and causing cracks at the drilling area of the entire circuit board.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board drilling, and specifically to a circuit board drilling device with a crack prevention function. Background Technique

[0002] Holes are an important part of multi-layer PCB boards. The drilling cost usually accounts for 30% - 40% of the PCB board manufacturing cost. Therefore, via design has also become one of the important parts of PCB design. Simply put, each hole on the PCB board can be called a via. From the function perspective, vias can be divided into two categories: one is used for electrical connection between layers; the other is used for device fixation or positioning. From the process manufacturing perspective, these vias are generally divided into three categories, namely blind vias, buried vias, and through vias;

[0003] Blind vias are located on the top and bottom surfaces of the PCB board and have a certain depth for connecting the surface layer circuit and the underlying inner layer circuit. The depth of the hole usually does not exceed a certain ratio (hole diameter); Buried vias refer to connection holes located inside the PCB board, which do not extend to the surface of the circuit board. Buried vias are located inside the circuit board and are completed using through-hole forming technology before lamination. Several inner layers may also overlap during the hole formation process; The third type of hole is a through via, which passes through the entire circuit board and can be used for internal interconnection or component installation and positioning holes;

[0004] Since through vias are easier to implement in terms of technology and have lower costs, most printed circuit boards use them. Usually, through vias with larger hole diameters are opened at the edges of the circuit board. Since the through vias are located at the edges of the circuit board, when the drilling device drills the circuit board, it is very easy for cracks to appear at the drilling position of the entire circuit board due to weak circuit board fixing strength, drill bit shaking, and untimely waste cleaning. Seriously, it may cause the circuit board to break. At the same time, the hole sizes on the entire circuit board are inconsistent, requiring the drill bit of the entire drilling device to be replaced conveniently;

[0005] Therefore, we propose a circuit board drilling device with a crack prevention function. Summary of the Invention

[0006] The purpose of the present invention is to provide a circuit board drilling device with a crack prevention function to solve the problem that the drilling device easily causes the circuit board to break due to weak circuit board fixing strength, drill bit shaking, and untimely waste cleaning as mentioned in the above background technique:

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A circuit board drilling device with a crack prevention function, comprising a workbench and a top plate. One side of the top of the workbench is fixed to the top plate by spot welding. One side of the top plate is fixed to a first cover plate by spot welding, and a fourth motor is installed on the top of the first cover plate. One side of the fourth motor penetrates through the first cover plate and is slidably connected to the first cover plate. The top of the top plate is fixed to a second electric push rod by bolts, and one end of the second electric push rod penetrates through the top plate and is fixed to a connecting column by spot welding. One end of the connecting column is fixed to the top of the fourth motor by bolts;

[0009] One end of the knob is rotatably connected to the top of the first cover plate through a bearing, and one end of the knob penetrates through the first cover plate and is fixed to a turntable by spot welding. Clamping columns are evenly installed on the top of the turntable, and one end of the clamping column penetrates through the turntable and is slidably connected to the turntable. A punching drill bit is installed at one end of the clamping column;

[0010] A second cover plate is installed at the bottom of the first cover plate, and a stabilizing mechanism is installed on the top of the second cover plate. The stabilizing mechanism includes a first sliding plate, a second sliding plate, a limiting groove, a fixing column, a first runner, a second runner and a fan. The top of the second cover plate is slidably connected to the first sliding plate, and the top of the first sliding plate is slidably connected to the second sliding plate. Limiting grooves are correspondingly formed on both sides of the first sliding plate and the second sliding plate, and fixing columns are slidably connected in the limiting grooves. Second runners are symmetrically rotatably connected to one side of the first sliding plate through bearings, and one side of each second runner penetrates through the first sliding plate and the second cover plate and is fixed to a fan by spot welding. One side of the first runner penetrates through the second sliding plate and the second cover plate and is fixed to a fan by spot welding.

[0011] Furthermore, a second through groove is formed on one side of the top plate, and a third motor is fixed to one side of the second through groove by bolts. Movable rods are symmetrically slidably connected in the second through groove, and one side of each movable rod is sleeved with a threaded rod connected to the output end of the third motor.

[0012] Furthermore, first through grooves are symmetrically formed in the top of the workbench, and a limiting plate is fixedly welded to the top of the workbench on one side of the first through groove. A positioning mechanism is installed on the top of the workbench. The positioning mechanism includes a frame, a first motor, a second motor and a first electric push rod. The first electric push rod is fixedly bolted to the bottom of the workbench, and the output end of the first electric push rod penetrates through the workbench and is fixedly bolted with the frame. A first motor is fixedly bolted to one side of the frame, and a first slider is slidably connected in the frame. The first slider is sleeved on the threaded rod on the output end of the first motor. A second slider is slidably connected to the top of the first slider, and a second motor is fixedly bolted to one side of the first slider. The second slider is sleeved on the threaded rod on the output end of the second motor. A dust falling groove is formed in the second slider. The bottom of the frame is symmetrically provided with blanking plates, and one side of the blanking plate penetrates through the first through groove and extends to the bottom of the workbench. A fixing mechanism is installed on the top of the second slider.

[0013] Furthermore, the fixing mechanism includes a fixing disk, a first clamping block and a second clamping block. A cross groove is formed in the top of the fixing disk, and the first clamping blocks are symmetrically and slidably connected in the cross groove. The second clamping blocks are symmetrically and slidably connected to the top of the first clamping blocks. One side of the first clamping block is movably connected with a first rotating column through a bearing, and one end of the first rotating column penetrates through the first clamping block and is movably connected with the inner wall of one side of the first clamping block through a bearing. The second clamping block is sleeved on the first rotating column. A second rotating column is movably connected with one side of the fixing disk at one end of the cross groove through a bearing, and one end of the second rotating column penetrates through one side of the fixing disk and is movably connected with the inside of the cross groove. The first clamping block is sleeved on the second rotating column. The inner spiral threads of the two first clamping blocks are opposite.

[0014] Furthermore, the dust falling groove is communicated with the cross groove. One side of the frame abuts against the limiting plate. Side plates are symmetrically and fixedly adhered to both sides of the top of the workbench. A dust blocking plate is installed at the bottom of the workbench.

[0015] Furthermore, the inner spiral threads of the two movable rods are opposite. One side of one movable rod is connected with one side of the first sliding plate, and one side of the other movable rod is connected with one side of the second sliding plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, the clamping columns on the entire turntable are driven to rotate by the fourth motor, so that the rotating clamping columns drive the punching drill bit to drill holes in the circuit board. Since a small-diameter punching drill bit is used to drill holes in the circuit board, compared with the traditional twist drill bit, the anti-cracking effect is better when drilling holes in the circuit board. At the same time, by rotating the knob, the punching drill bit can be replaced on the fourth motor, making the hole drilling of the entire circuit board more flexible;

[0018] 2. In the present invention, the rotation of the third motor drives two movable rods to clamp the clamping columns on the first slide plate and the second slide plate, improving the stability when the entire fourth motor drives the clamping columns to rotate. At the same time, the first runner and the second runner installed on the first slide plate and the second slide plate not only reduce the friction between the rotating clamping columns and the first slide plate and the second slide plate, but also drive the fans on one side of the first runner and the second runner to rotate through the rotating clamping columns, so that the waste chips generated when the entire punching drill bit drills the circuit board are promptly blown away by the fans, preventing the waste chips from affecting the drilling of the entire circuit board and causing cracks at the drilling position of the entire circuit board;

[0019] 3. In the present invention, by rotating the fixed disk and the second rotating column and the first rotating column on the first clamping block, the entire first clamping block and the second clamping block clamp and fix circuit boards of different sizes, preventing the circuit board from shaking during drilling and causing vibration problems during drilling by the drill bit, which is extremely likely to cause crack problems on the circuit board during drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the circuit board drilling device with a crack prevention function of the present invention;

[0021] Figure 2 It is a schematic cross-sectional view of the connection structure between the workbench and the positioning mechanism of the present invention;

[0022] Figure 3 It is an enlarged schematic view of the structure at A of the present invention;

[0023] Figure 4 It is a schematic cross-sectional view of the connection structure between the positioning mechanism and the fixing mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of the connection structure of the components of the first cover plate and the second cover plate of the present invention;

[0025] Figure 6 It is a schematic diagram of the connection of some structures in the stability mechanism of the present invention;

[0026] Figure 7 It is an enlarged schematic view of the structure at B of the present invention.

[0027] In the figure: 1, workbench; 2, dust baffle; 3, top plate; 4, side plate; 5, limit plate; 6, positioning mechanism; 601, frame; 602, first motor; 603, first slider; 604, second motor; 605, second slider; 606, ash chute; 607, first electric push rod; 608, blanking plate; 7, first through groove; 8, fixing mechanism; 801, fixing disk; 802, cross groove; 803, first clamping block; 804, second clamping block; 805, first rotating column; 806, second rotating column; 9, second through groove; 10, third motor; 11, movable rod; 12, second electric push rod; 13, first cover plate; 14, fourth motor; 15, knob; 16, turntable; 17, clamping column; 18, punching drill bit; 19, stabilizing mechanism; 191, first sliding plate; 192, second sliding plate; 193, limiting groove; 194, fixing column; 195, first runner; 196, second runner; 197, fan; 20, second cover plate; 21, connecting column. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-7 , the present invention provides a technical solution:

[0030] Embodiment 1:

[0031] As Figure 1 shown, the entire circuit board drilling device is mainly divided into three modules. The first is for fixing, moving and lifting the circuit board, the second is for replacing the drill bit of the drilling device, and the third is for stabilizing the device when the entire drill bit rotates. During specific operation, the staff first installs the entire circuit board on the fixing mechanism 8;

[0032] As Figures 3-4As shown in the figure, four groups of first clamping blocks 803 are installed on the fixing plate 801 of the entire fixing mechanism 8. At the same time, the four groups of clamping blocks are respectively installed in the cross grooves 802 on the fixing plate 801. One side of the entire first clamping block 803 is provided with a first rotating column 805. The entire first rotating column 805 is responsible for the movement of the two second clamping blocks 804 on the first clamping block 803. Since the internal spiral threads of the two second clamping blocks 804 are opposite, when the staff rotates the first rotating column 805, the two second clamping blocks 804 move towards each other or away from each other on the first clamping block 803, so as to realize the clamping and detachment of the second clamping blocks 804 from the circuit board. The size of the entire second clamping block 804 is limited. When a larger circuit board needs to be fixed, at this time, the entire first clamping blocks 803 play a role in fixing the circuit board;

[0033] Similarly, the entire first clamping block 803 is located in the cross groove 802. One side of the entire fixing plate 801 is rotatably connected with a second rotating column 806. One end of the second rotating column 806 extends into the cross groove 802. The staff rotates the second rotating column 806 to realize the movement towards each other or away from each other between the two first clamping blocks 803 in the cross groove 802. Since the entire first clamping block 803 and the second clamping block 804 clamp the circuit board by using metal parts, the circuit board fixed by the clamping blocks must have a certain strength. When fixing a flexible circuit board, for example, a rigid backing plate needs to be added to prevent uneven adjustment between the clamping blocks from causing the entire flexible circuit board to warp and affecting subsequent drilling;

[0034] In order to improve the drilling efficiency of the entire drilling device, the staff can fix the drill bit required for drilling to the turntable 16 at the bottom of the first cover plate 13 in advance. The entire first cover plate 13 is fixed to one side of the top plate 3, as Figure 5As shown in the figure, a plurality of clamping columns 17 are slidably connected to the entire turntable 16 evenly. One end of the entire clamping column 17 is responsible for fixing the punching drills 18 of different sizes. The staff can rotate one side of the clamping column 17 to fix and release the drill bit. When the entire punching drill 18 is fixed, when a punching drill 18 of a certain size is needed, at this time, the knob 15 on the top of the entire first cover plate 13 can be rotated. The entire knob 15 drives the turntable 16 to rotate, so that one end of the clamping column 17 is located at the bottom of the output end of the fourth motor 14. In order to facilitate the fourth motor 14 to drive the punching drill 18 on the clamping column 17 to rotate, a special hole is opened at one end of the entire clamping column 17. At the same time, the output end of the entire fourth motor 14 is also modified. The output end is a square joint. At the same time, a hole with a round upper part and a square lower part is opened at one end of the entire clamping column 17. The radius of the entire circular hole is greater than the side length of the square joint at the output end of the fourth motor 14. The square hole at the bottom of the circular hole is just docked with the output end of the fourth motor 14. In the later stage, the knob 15 on the top of the turntable 16 can be modified and upgraded, so that the staff does not need to manually rotate the turntable 16 to replace the entire punching drill 18. Finally, in order for the fourth motor 14 to be docked with one end of the clamping column 17, the top of the entire fourth motor 14 is connected to the second electric push rod 12 on the top plate 3 through the connecting column 21, so that the entire fourth motor 14 can move up and down on both sides of the first cover plate 13 to complete the docking work of the clamping column 17. The replacement of the drill bit during the drilling of the entire circuit board is more convenient and fast, further improving the efficiency of the entire circuit board drilling;

[0035] Embodiment 2:

[0036] In order to improve the stability of the entire drill bit during rotation, at this time, the third motor 10 located on one side of the second through groove 9 starts to work. The threaded rods connected to one end of the third motor 10 are symmetrically installed with movable rods 11 in the entire second through groove 9. At the same time, the internal spiral threads of the two movable rods 11 are opposite, and they can also move towards each other or away from each other, as Figures 6-7 shown, one side of a movable rod 11 is connected to the first sliding plate 191 on the stabilizing mechanism 19, and one side of the other movable rod 11 is connected to the second sliding plate 192 on the stabilizing mechanism 19. The first sliding plate 191 and the second sliding plate 192 are provided with limiting grooves 193. At the same time, fixing columns 194 for preventing misalignment between the sliding plates are installed in the limiting grooves 193. The opposite surfaces of the first sliding plate 191 and the second sliding plate 192 are provided with V-shaped grooves. At the same time, a first runner 195 and a second runner 196 are symmetrically and movably connected to the edges of the two sliding plates located in the V-shaped grooves, as Figure 5 shown, the punching drill 18 on the entire clamping column 17 passes through between the four runners. At the same time, the four runners fix the edge of the clamping column 17 under the push of the movable rod 11, making the entire clamping column 17 more stable during rotation, and the punching drill 18 opposite is also more stable when drilling the circuit board;

[0037] Since the four rotating wheels are located on the outer wall of the clamping column 17, when the entire clamping column 17 rotates, the four rotating wheels will also start to rotate due to the action of friction. Since the other ends of the four rotating wheels penetrate through the second cover plate 20 and are fixed with a fan 197, the entire fan 197 rotates with the rotation of the punching drill bit 18. Also, because the entire fan 197 is located around the drill bit, when the drill bit starts to drill the circuit board, the waste chips generated are immediately blown away by the fan 197, preventing the waste chips from contacting the drill bit and causing the drill bit to slip, which may lead to damage or breakage of the entire circuit board;

[0038] Example 3:

[0039] After the entire punching drill bit 18 finishes drilling, the two movable rods 11 move away from each other to pull the first slide plate 191 and the second slide plate 192 apart. To improve the chip removal efficiency of the entire device, first, two acrylic side plates 4 are symmetrically installed on the top of the entire workbench 1. At the same time, a dust baffle 2 for storing waste chips is installed at the bottom of the workbench 1, as Figure 2 shown. First through grooves 7 are symmetrically opened on the entire workbench 1. A blanking plate 608 is installed at the bottom of the inner frame 601 of the positioning mechanism 6. The entire blanking plate 608 penetrates through the first through groove 7. When the waste chips generated from drilling the circuit board fall into the frame 601, the waste chips successfully fall onto the dust baffle 2 along the first through groove 7;

[0040] To increase the probability of the entire waste chips falling into the frame 601, as Figure 4 shown, the cross groove 802 opened on the entire fixed disk 801 is connected to the dust - falling groove 606 opened on the second slider 605. The waste chips falling into the cross groove 802 enter the top of the frame 601 along the dust - falling groove 606 and finally reach the dust baffle 2 through the frame 601, which is convenient for the later staff to clean the entire workbench 1.

[0041] Example 4:

[0042] Since the position where the entire fourth motor 14 drives the punching drill bit 18 to rotate remains unchanged, when drilling different positions of the circuit board on the fixing mechanism 8, the entire positioning device needs to be involved. As Figure 1 shown, the frame 601 in the entire positioning mechanism 6 is located on the top of the workbench 1. At the same time, a first motor 602 is fixed to one side of the entire frame 601 by bolts. The entire first motor 602 drives the threaded rod in the frame 601 to rotate, so that the first slider 603 on the threaded rod can move left and right in the frame 601;

[0043] A second slider 605 is slidably connected to the entire first slider 603, and the entire circuit board fixing mechanism 8 is installed on the top of the second slider 605. A second motor 604 is installed on one side of the entire second slider 605. By rotating the second motor 604, the threaded rod rotates, causing the entire second slider 605 to move back and forth on the first slider 603. Finally, in order to send the circuit board fixed on the fixing plate 801 to the bottom of the punching drill 18, at this time, the first electric push rod 607 located at the bottom of the workbench 1 starts to work, pushing the entire frame 601 upward along the limiting plate 5 until the circuit board can contact the punching drill 18. Driven by the second motor 604 and the third motor 10, the entire circuit board can move back and forth, left and right at the bottom of the punching drill 18, so that different positions on the entire circuit board can be drilled.

[0044] Working principle:

[0045] First, fix the entire circuit board to the fixing mechanism 8. For a larger circuit board, the user rotates the second screw post 806, thereby realizing the relative movement or the opposite movement between the two first clamping blocks 803 in the cross groove 802. When it comes to a small-sized circuit board, when the user rotates the first screw post 805, the two second clamping blocks 804 move relative to each other or away from each other on the first clamping block 803, thereby realizing the clamping or releasing operation of the second clamping block 804 on the circuit board.

[0046] After the entire circuit board is fixed, start to adjust the drill for drilling. The operator can fix the drill required for drilling to the turntable 16 at the bottom of the first cover plate 13 in advance. At the same time, the second electric push rod 12 pushes one end of the fourth motor 14 into contact with the top of the clamping column 17. At the same time, the entire first electric push rod 607 pushes the entire frame 601 upward, so that the entire fourth motor 14 can drive the entire punching drill 18 to drill the circuit board.

[0047] When the drilling position on the circuit board needs to be adjusted, the entire first motor 602 and the second motor 604 on the first slider 603 start to work. When horizontally adjusting the position of the circuit board, the entire first motor 602 rotates, causing the first slider 603 sleeved on the threaded rod to move left and right within the frame 601. When vertically adjusting the position of the circuit board, the second motor 604 on the first slider 603 rotates and causes the second slider 605 sleeved on the threaded rod to slide back and forth on the top of the first slider 603, so that the entire top of the circuit board can be drilled.

[0048] To improve the stability of the rotation of the entire impact drill bit 18, under the rotation of the third motor 10, the first slide plate 191 and the second slide plate 192 drive the first runner 195 and the second runner 196 to approach the clamping column 17 and clamp the clamping column 17. When the entire clamping column 17 rotates, the first runner 195 and the second runner 196 surrounding the clamping column 17 also start to rotate and drive the fan on one side of the punching drill bit 18 to rotate, cleaning the waste chips drilled by the punching drill bit 18, that is, improving the stability of the rotation of the punching drill bit 18 and cleaning the waste chips produced by the punching drill bit 18.

[0049] The above content is only an example and description of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can well understand and utilize the present invention. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. A circuit board drilling device with a crack prevention function, comprising a workbench (1) and a top plate (3). One side of the top of the workbench (1) is fixed to the top plate (3) by spot welding. It is characterized in that: One side of the top plate (3) is fixed to the first cover plate (13) by spot welding. A fourth motor (14) is installed on the top of the first cover plate (13). One side of the fourth motor (14) penetrates through the first cover plate (13) and is slidably connected to the first cover plate (13). A second electric push rod (12) is fixed to the top of the top plate (3) by bolts. One end of the second electric push rod (12) penetrates through the top plate (3) and is fixed to a connecting column (21) by spot welding. One end of the connecting column (21) is fixed to the top of the fourth motor (14) by bolts. The top of the first cover plate (13) is rotatably connected to a knob (15) through a bearing. One end of the knob (15) penetrates through the first cover plate (13) and is fixed to a turntable (16) by spot welding. Clamping columns (17) are evenly installed on the top of the turntable (16). One end of the clamping column (17) penetrates through the turntable (16) and is slidably connected to the turntable (16). A punching drill bit (18) is installed at one end of the clamping column (17). A second cover plate (20) is installed at the bottom of the first cover plate (13). A stabilizing mechanism (19) is installed on the top of the second cover plate (20). The stabilizing mechanism (19) includes a first sliding plate (191), a second sliding plate (192), a limiting groove (193), a fixing column (194), a first runner (195), a second runner (196) and a fan (197). The first sliding plate (191) is slidably connected to the top of the second cover plate (20). The second sliding plate (192) is slidably connected to the top of the first sliding plate (191). Limiting grooves (193) are correspondingly formed on both sides of the first sliding plate (191) and the second sliding plate (192). A fixing column (194) is slidably connected in the limiting groove (193). The first runner (195) is symmetrically and rotatably connected to one side of the first sliding plate (191) through a bearing. One side of the first runner (195) penetrates through the first sliding plate (191) and the second cover plate (20) and is fixed to the fan (197) by spot welding. One side of the second runner (196) penetrates through the second sliding plate (192) and the second cover plate (20) and is fixed to the fan (197) by spot welding. The rotation of the clamping column (17) drives the rotation of the first runner (195) and the second runner (196).

2. The circuit board drilling device with a crack prevention function according to claim 1, It is characterized in that: One side of the top plate (3) is provided with a second through groove (9), and a third motor (10) is fixed by bolts on one side of the second through groove (9). The second through groove (9) is symmetrically and slidably connected with movable rods (11), and the movable rods (11) are sleeved on the threaded rods connected to the output ends of the third motor (10). The two movable rods (11) are respectively connected to the first sliding plate (191) and the second sliding plate (192).

3. A circuit board drilling device with a crack prevention function according to claim 1, characterized in that: The top of the workbench (1) is symmetrically provided with first through grooves (7), and a limiting plate (5) is fixed by spot welding on the top of the workbench (1) on one side of the first through grooves (7). A positioning mechanism (6) is installed on the top of the workbench (1). The positioning mechanism (6) includes a frame (601), a first motor (602), a second motor (604) and a first electric push rod (607). The first electric push rod (607) is fixed by bolts at the bottom of the workbench (1), and the output end of the first electric push rod (607) penetrates through the workbench (1) and is fixed by bolts with the frame (601). A first motor (602) is fixed by bolts on one side of the frame (601), and a first slider (603) is slidably connected in the frame (601). The first slider (603) is sleeved on the threaded rod on the output end of the first motor (602). The top of the first slider (603) is slidably connected with a second slider (605), and a second motor (604) is fixed by bolts on one side of the first slider (603). The second slider (605) is sleeved on the threaded rod on the output end of the second motor (604). A dust falling groove (606) is formed in the second slider (605). The bottom of the frame (601) is symmetrically provided with blanking plates (608), and one side of the blanking plates (608) penetrates through the first through grooves (7) and extends to the bottom of the workbench (1). A fixing mechanism (8) is installed on the top of the second slider (605).

4. A circuit board drilling device with a crack prevention function according to claim 3, characterized in that: The fixing mechanism (8) includes a fixing plate (801), a first clamping block (803) and a second clamping block (804). A cross groove (802) is formed at the top of the fixing plate (801), and the first clamping block (803) is symmetrically and slidably connected within the cross groove (802). The second clamping block (804) is symmetrically and slidably connected to the top of the first clamping block (803). One side of the first clamping block (803) is movably connected to a first rotating column (805) through a bearing, and one end of the first rotating column (805) penetrates through the first clamping block (803) and is movably connected to the inner wall of one side of the first clamping block (803) through a bearing. The second clamping block (804) is sleeved on the first rotating column (805). One side of the fixing plate (801) and at one end of the cross groove (802) is movably connected to a second rotating column (806) through a bearing, and one end of the second rotating column (806) penetrates through one side of the fixing plate (801) and is movably connected to the inside of the cross groove (802). The first clamping block (803) is sleeved on the second rotating column (806). The inner spiral threads of the two first clamping blocks (803) are opposite.

5. The circuit board drilling device with crack prevention function according to claim 4, characterized in that: The dust falling groove (606) is communicated with the cross groove (802). One side of the frame (601) abuts against the limiting plate (5). The two sides of the top of the workbench (1) are symmetrically and fixedly provided with side plates (4) by adhesion. A dust blocking plate (2) is installed at the bottom of the workbench (1).

6. The circuit board drilling device with crack prevention function according to claim 2, characterized in that: The inner spiral threads of the two movable rods (11) are opposite. One side of one movable rod (11) is connected to one side of the first sliding plate (191), and one side of one movable rod (11) is connected to one side of the second sliding plate (192).

Images