Punching device for circuit board processing

Abstract

The invention relates to the technical field of circuit board punching, and provides a circuit board processing punching device which comprises an outer shell, the outer surface of the outer shell is provided with a horizontal moving structure, the conveying end of the horizontal moving structure is connected with a movable block, and the outer surface of the outer shell is connected with a telescopic air cylinder; the inner wall of the outer shell is connected with a dust collecting structure corresponding to the lower end of the adjusting structure; the surface of the outer shell is fixedly connected with a limiting frame for limiting the position of the circuit board; the adjusting structure comprises an inner cavity formed in the outer shell, an electric cylinder is fixedly connected to the position, corresponding to the inner cavity, in the outer shell, the output end of the electric cylinder is fixedly connected with a sliding plate, one end of the sliding plate is fixedly connected with a supporting plate, a concave groove is formed in the middle of the supporting plate, and connecting plates are fixedly connected to the positions, close to the upper end, of the two sides of the supporting plate. By means of the technical scheme, the problem that when hole positions are different in the punching process of an existing circuit board machining punching device, punching needs to be conducted after the position of a circuit board is adjusted, and efficiency is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board drilling, and specifically, to a drilling device for circuit board processing. Background Art

[0002] With the development of electronic devices towards miniaturization, high density, and multi-functionality, the integration degree of printed circuit boards has been significantly improved, posing higher requirements for micro-hole processing technology. Drilling, as one of the key processes in PCB manufacturing, directly affects the reliability of circuit interconnection, the quality of signal transmission, and the installation accuracy of components; After retrieval, a circuit board drilling device with the authorization announcement number CN115476404B. In this invention, by setting a drilling mechanism, the position of the drill head can be adjusted by adjusting the angle and the extension length of the drill head, so that the drill head can match the four corners of circuit boards of different sizes. Then, with the cooperation of the lifting mechanism, drilling operations can be performed on the four corners of circuit boards of different sizes, which is beneficial to improving the applicable range of the device; However, when the positions of the hole sites are different during the drilling process of the above-mentioned existing circuit board processing drilling device, it is necessary to adjust the position of the circuit board before drilling, which will prolong the processing time. For this reason, we propose a drilling device for circuit board processing. Summary of the Invention

[0003] The present invention proposes a drilling device for circuit board processing, which solves the problem that in the background art, when the positions of the hole sites are different during the drilling process of the existing circuit board processing drilling device, it is necessary to adjust the position of the circuit board before drilling, resulting in low efficiency.

[0004] The technical solution of the present invention is as follows: A drilling device for circuit board processing includes an outer housing. A horizontal movement structure is arranged on the outer surface of the outer housing. The conveying end of the horizontal movement structure is connected to a movable block. A telescopic cylinder is connected to the outer surface of the outer housing. A dust collection structure is connected to the inner wall of the outer housing corresponding to the lower end of the adjustment structure. A limiting frame for restricting the position of the circuit board is fixedly connected to the surface of the outer housing; The adjustment structure includes an inner cavity opened inside the outer housing. An electric cylinder is fixedly connected to the inside of the outer housing corresponding to the inner cavity. The output end of the electric cylinder is fixedly connected to a sliding plate. One end of the sliding plate is fixedly connected to a support plate. A recessed groove is opened in the middle of the support plate. Connecting plates are fixedly connected to both sides of the support plate near the upper end.

[0005] As a further technical solution of the present invention, the output end of the telescopic cylinder is connected to a drill head, which is used to drill the surface of the circuit board. A controller for controlling the operation of electrical components in the control device is arranged on the outer surface of the outer housing.

[0006] As a further technical solution of the present invention, a telescopic cylinder is fixedly connected to the outer surface of the movable block, and a punching head and an extrusion structure are respectively fixedly connected to the output end of the telescopic cylinder.

[0007] As a further technical solution of the present invention, the dust collection structure includes a through hole opened at the lower position inside the support plate. A discharge pipe is fixedly connected to the through hole corresponding to the center line at the lower end of the support plate. A guide pipe is fixedly connected between the through hole corresponding to the non-center line at the lower end of the support plate and the discharge pipe. A partition is fixedly connected to the inner side of the outer shell corresponding to the lower end of the discharge pipe. Strip-shaped holes are opened on the outer surface of the partition. A limiting plate is fixedly connected to the side surface of the discharge pipe near the lower end. A dust collection box is connected to the lower end of the partition inside the outer shell in a drawable manner. Air duct cavities are opened at both ends of the support plate clamped inside the outer shell. The cavity formed between the support plates is the lower wind cavity. A filter screen is fixedly connected between the air duct cavity, the concave groove and the lower wind cavity. A central frame is fixedly connected to the middle of the filter screen. A blowing box is fixedly connected to the inside of the outer shell corresponding to the air duct cavity.

[0008] As a further technical solution of the present invention, the extrusion structure includes a hollow column fixedly connected to the output end of the telescopic cylinder. A sliding column is slidably connected inside the hollow column. A top spring is connected between the top end of the sliding column and the telescopic cylinder. A positioning pad is fixedly connected to the lower end of the sliding column.

[0009] As a further technical solution of the present invention, the position of the support plate on the surface of the outer shell is adjusted by the pushing and retracting of the electric cylinder. The number of the concave grooves is several groups and they are parallel to each other. The connecting plate is embedded inside the outer shell, and the connecting plate is slidably connected to the outer shell.

[0010] As a further technical solution of the present invention, the support plate is a plate-like structure with protrusions and depressions, and the height of the protrusions is flush with the surface of the outer shell. The number of the support plates corresponding to the sliding plate in a group is two and they are symmetrically distributed. The punching of different areas of the circuit board is adjusted by the back-and-forth movement of the support plate.

[0011] As a further technical solution of the present invention, the guide pipe is obliquely arranged. The upper ends of the guide pipe and the guide pipe are respectively communicated with their corresponding through holes. The lower end of the guide pipe is communicated with the inside of the discharge pipe. The lower end opening of the discharge pipe penetrates through the limiting plate. The limiting plate is of an "I"-shaped structure. The opening of the strip-shaped hole is larger than the opening of the discharge pipe. The length direction of the opening of the strip-shaped hole is the direction in which the discharge pipe moves following the support plate.

[0012] As a further technical solution of the present invention, the lower air chamber is isolated from the ash collection box below the partition by the limiting plate. The number of the blowing boxes is two groups, and the blowing direction of one group of blowing boxes is from bottom to top, while the other group of blowing boxes is opposite. The waste dust falling in the through hole is collected through the discharge pipe and the guide pipe, and the blowing of the blowing box promotes the collection of the waste dust.

[0013] As a further technical solution of the present invention, the sliding column slides up and down along the hollow column. The upper and lower elastic ends of the positioning cushion block are respectively fixedly connected to the telescopic cylinder and the sliding column. The sliding column together with the positioning cushion block is pushed by the pushing spring to realize precise drilling of the circuit board. The number of the extrusion structures is several groups and they are distributed in an annular array.

[0014] The working principle and beneficial effects of the present invention are as follows: In the present invention, through the action of the adjustment structure, the lower end of the fixed circuit board can be divided into a group of strip-shaped cavity parts. By adjusting the position of the support plate, the position of the concave groove can correspond to different positions on the circuit board respectively, so as to carry out efficient drilling work, with a large application range and strong adaptability, and at the same time, the deformation of the circuit board can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0016] Figure 1 is a schematic structural diagram of the drilling device for circuit board processing of the present invention; Figure 2 For the present invention Figure 1 is a partial structural schematic diagram cut open from another perspective; Figure 3 For the present invention Figure 2 is an enlarged partial structural diagram; Figure 4 is a partial structural schematic diagram of the guide pipe of the present invention; Figure 5 For the present invention Figure 4 is a partial structural schematic diagram cut open; Figure 6 is a partial structural schematic diagram of the ash collection box pulled out and cut open of the present invention; Figure 7 is a partial structural schematic diagram of the ash collection structure cut open from another perspective of the present invention; Figure 8 For the present invention Figure 7 is a front view of the air flow diagram; Figure 9 For the present invention Figure 7 is a partial structural schematic diagram cut open from another perspective; Figure 10This is a schematic diagram of a partial structure cut open at the extrusion structure of the present invention.

[0017] In the figure: 1, outer housing; 2, horizontal movement structure; 3, movable block; 4, telescopic cylinder; 5, adjustment structure; 51, inner cavity; 52, electric cylinder; 53, sliding plate; 54, support plate; 55, recessed groove; 56, connecting plate; 6, punching head; 7, dust collection structure; 71, through hole; 72, discharge pipe; 73, guide pipe; 74, partition plate; 75, strip hole; 76, limiting plate; 77, dust collection box; 78, air duct cavity; 79, central frame; 710, filter screen; 711, air blowing box; 712, lower air cavity; 8, extrusion structure; 81, hollow column; 82, jacking spring; 83, sliding column; 84, positioning cushion block; 9, controller; 10, limiting frame. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 making creative efforts fall within the scope of protection of the present invention. Embodiment

[0019] As Figures 1 to 3 shown, this embodiment proposes a punching device for circuit board processing, including an outer housing 1. A horizontal movement structure 2 is arranged on the outer surface of the outer housing 1. The conveying end of the horizontal movement structure 2 is connected to a movable block 3. A telescopic cylinder 4 is connected to the outer surface of the outer housing 1. A dust collection structure 7 is connected to the inner wall of the outer housing 1 corresponding to the lower end of the adjustment structure 5. A limiting frame 10 for restricting the position of the circuit board is fixedly connected to the surface of the outer housing 1; the output end of the telescopic cylinder 4 is connected to a punching head 6, and the punching head 6 is used for punching the surface of the circuit board. A controller 9 for controlling the operation of electrical components in the control device is arranged on the outer surface of the outer housing 1; a telescopic cylinder 4 is fixedly connected to the outer surface of the movable block 3, and the output end of the telescopic cylinder 4 is fixedly connected to a punching head 6 and an extrusion structure 8 respectively.

[0020] The adjustment structure 5 includes an inner cavity 51 opened inside the outer housing 1. An electric cylinder 52 is fixedly connected to the inside of the outer housing 1 corresponding to the inner cavity 51. The output end of the electric cylinder 52 is fixedly connected to a sliding plate 53. One end of the sliding plate 53 is fixedly connected to a support plate 54. A recessed groove 55 is opened in the middle of the support plate 54. Connecting plates 56 are fixedly connected to both sides of the support plate 54 near the upper end.

[0021] The position of the support plate 54 on the surface of the outer housing 1 is adjusted by the pushing and retracting of the electric cylinder 52. The number of the recessed grooves 55 is several groups and they are parallel to each other. The connecting plate 56 is embedded in the inner side of the outer housing 1, and the connecting plate 56 is slidably connected to the outer housing 1; the support plate 54 is a plate-like structure with protrusions and recesses, and the height of the protrusions is flush with the surface of the outer housing 1. The number of the support plates 54 corresponding to the sliding plate 53 is two groups and they are symmetrically distributed. The punching of different areas of the circuit board is adjusted by the back-and-forth movement of the support plate 54.

[0022] In this embodiment, the lower end of the fixed circuit board can be divided into a group of strip-shaped cavity parts. By adjusting the position of the support plate 54, the positions of the recessed grooves 55 can correspond to different positions on the circuit board respectively, so that efficient drilling work can be carried out, with a large application range and strong adaptability. At the same time, the deformation of the circuit board can be prevented. Embodiment

[0023] As Figures 4 to 9 shown, on the basis of Embodiment 1, a dust collection structure 7 is further proposed, which includes a through hole 71 opened at the lower position inside the support plate 54. A discharge pipe 72 is fixedly connected to the through hole 71 corresponding to the center line at the lower end of the support plate 54. A guide pipe 73 is fixedly connected between the through hole 71 corresponding to the non-center line at the lower end of the support plate 54 and the discharge pipe 72. A partition plate 74 is fixedly connected to the inner side of the outer housing 1 corresponding to the lower end of the discharge pipe 72. A strip-shaped hole 75 is opened on the outer surface of the partition plate 74. A limiting plate 76 is fixedly connected to the side surface of the discharge pipe 72 near the lower end. A dust collection box 77 is slidably connected to the inner part of the outer housing 1 corresponding to the lower end of the partition plate 74. An air duct cavity 78 is opened at the two ends of the outer housing 1 for clamping the support plate 54. The cavity formed between the support plates 54 is a lower air cavity 712. A filter screen 710 is fixedly connected between the air duct cavity 78, the recessed groove 55 and the lower air cavity 712. A central frame 79 is fixedly connected to the middle of the filter screen 710. A blowing box 711 is fixedly connected to the inner part of the outer housing 1 corresponding to the air duct cavity 78.

[0024] The guide pipe 73 is obliquely arranged. The upper ends of the guide pipe 73 and the guide pipe 73 are both communicated with the corresponding through hole 71. The lower end of the guide pipe 73 is communicated with the inside of the discharge pipe 72. The lower end opening of the discharge pipe 72 penetrates through the limiting plate 76. The limiting plate 76 is an "I"-shaped structure. The opening of the strip-shaped hole 75 is larger than the opening of the discharge pipe 72. The opening length direction of the strip-shaped hole 75 is the direction in which the discharge pipe 72 moves following the support plate 54; the lower air cavity 712 is isolated from the dust collection box 77 below the partition plate 74 through the limiting plate 76. The number of the blowing boxes 711 is two groups. The blowing direction of one group of blowing boxes 711 is from bottom to top, and the other group of blowing boxes 711 is opposite. The waste dust falling in the through hole 71 is collected through the discharge pipe 72 and the guide pipe 73, and the blowing of the blowing box 711 promotes the collection of the waste dust.

[0025] In this embodiment, during the process in which the adjustable structure 5 functions, the support plate 54 moves back and forth. Through the design of the concave groove 55 structure, after the drilling is completed, the dust generated by the drilling can be collected through the concave groove 55, and finally the waste dust is collected inside the dust collection box 77 through the material guiding pipe 73 and the discharge pipe 72. The user only needs to clean the dust collection box 77 regularly. Embodiment

[0026] As Figure 10 shown, on the basis of Embodiment 1, an extrusion structure 8 is further proposed. The extrusion structure 8 includes a hollow column 81 fixedly connected to the output end of the telescopic cylinder 4. A sliding column 83 is slidably connected inside the hollow column 81. A pushing spring 82 is connected between the top end of the sliding column 83 and the telescopic cylinder 4. The lower end of the sliding column 83 is fixedly connected with a positioning pad 84.

[0027] The sliding column 83 slides up and down along the hollow column 81. The upper and lower elastic ends of the positioning pad 84 are respectively fixedly connected to the telescopic cylinder 4 and the sliding column 83. The sliding column 83 together with the positioning pad 84 is pushed by the pushing spring 82 to realize precise drilling of the circuit board. The number of the extrusion structures 8 is several groups and they are distributed in a circular array.

[0028] In this embodiment, during use, by pressing the circuit board from the upper end by the extrusion structure 8 and cooperating with the support of the circuit board by the support plate 54, the drilling processing accuracy of the circuit board can be effectively improved during the processing of various flexible or non-flexible circuit boards.

[0029] In summary, the working principle of the present invention is specifically as follows: During use, when a circuit board needs to be processed, the user can place the circuit board inside the limit frame 10 on the upper surface of the outer housing 1, and then start the device for processing. First, through the operation of the horizontal movement structure 2, the movable block 3 is moved on the upper end of the outer housing 1 to the position where drilling is required, and then the output end of the telescopic cylinder 4 extends, and the corresponding position of the circuit board is drilled through the drilling head 6; During the above-mentioned drilling process, when the position where the drilling head 6 drills corresponds to the position of the support plate 54, the electric cylinder 52 on one side can extend, and at the same time, the electric cylinder 52 corresponding to the sliding plate 53 on the other side contracts, so that the two groups of sliding plates 53 move towards one side. The two groups of sliding plates 53 drive the support plate 54 to move accordingly. After the position of the concave groove 55 corresponds to the position where the circuit board needs to be drilled, the electric cylinder 52 stops operating. Then, the drilling head 6 drills the position of the circuit board. Thus, by adjusting the position of the support plate 54, the drilling requirements with a larger applicable range can be achieved, and it can adapt to the drilling needs of different positions of different circuit boards. At the same time, through the setting of the convex position at the upper end of the support plate 54, the circuit board can be effectively supported, greatly reducing the error generated during the drilling process; During the process in which the above-mentioned adjusting structure 5 functions, when the drilling head 6 moves downward for drilling, the positioning cushion block 84 will first come into contact with the circuit board. As the drilling head 6 continues to move downward, it will squeeze and compress the pushing spring 82. Through the reaction force of the pushing spring 82, the sliding column 83 together with the positioning cushion block 84 can be pushed downward to press the circuit board, and with the cooperation of the support plate 54, high-precision processing of the circuit board can be achieved; During the use of the adjusting structure 5, by making the concave groove 55 correspond to the drilling position, the waste dust after drilling can be collected inside the concave groove 55. At the same time, the dust is respectively introduced into the inside of the guide pipe 73 and the discharge pipe 72 through the through hole 71. The dust body is introduced into the inside of the discharge pipe 72 through the guide pipe 73, and finally poured into the inside of the dust collection box 77 through the discharge pipe 72 for collection. At the same time, during the movement of the support plate 54, the discharge pipe 72, the guide pipe 73 and the limiting plate 76 can move along. And the movement will cause a certain amount of shaking, which can effectively promote the dust body collected in the concave groove 55 to fall from the inside of the through hole 71 into the discharge pipe 72 and the guide pipe 73, forming a promoting effect; Meanwhile, the blower box 711 on one side can blow air upward from the inside of the first group of air duct cavities 78. Then, the air enters the inside of the concave groove 55 through the filter net 710. Then, it enters the inside of the other group of air duct cavities 78 from the concave groove 55 on the other side. Then, the other blower box 711 blows the air downward. Then, the air is blown into the inside of the lower air cavity 712 from the air duct cavity 78 on the other side through the filter net 710. Then, the air is blown into the inside of the first group of air duct cavities 78 again from the lower air cavity 712 through the filter net 710, thus forming a blowing cycle, which can promote the fine dust inside the concave groove 55 to fall into the inside of the through hole 71. The filter net 710 is used to filter the fine dust to prevent the dust from entering the air duct cavity 78 inside the outer shell 1. When it is necessary to process the waste dust of the mobile phone, the user only needs to hold the handle of the dust collection box 77 and pull it outwards to pour it out to complete the cleaning. At the same time, the movable support plate 54 will drive the concave groove 55 to move accordingly, and the filter net 710 can always allow the air to pass through while filtering the fine dust.

[0030] It should be noted that the operating principle of the horizontal movement structure 2 is the existing screw sliding principle, mainly driving the slider on it to slide through the rotation of the screw, and restricting its sliding direction through the positioned smooth rod body, which is not elaborated in detail in this application.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, 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 punching device for circuit board processing, comprising a housing (1), wherein a horizontal movement structure (2) is arranged on the outer surface of the housing (1), and a movable block (3) is connected to the conveying end of the horizontal movement structure (2), characterized in that, The outer surface of the outer shell (1) is connected to a telescopic cylinder (4), the inner wall of the outer shell (1) is connected to an ash collecting structure (7) at the lower end of the corresponding adjustment structure (5), and the surface of the outer shell (1) is fixedly connected to a limit frame (10) for limiting the position of the circuit board; The regulating structure (5) comprises an inner cavity (51) provided inside the outer shell (1); an electric cylinder (52) is fixedly connected to a position inside the outer shell (1) corresponding to the inner cavity (51); an output end of the electric cylinder (52) is fixedly connected to a sliding plate (53); one end of the sliding plate (53) is fixedly connected to a support plate (54); a recessed groove (55) is provided in the middle of the support plate (54); and connecting plates (56) are fixedly connected to both sides of the support plate (54) near the upper end.

2. The punching device for circuit board processing according to claim 1, characterized in that, The output end of the telescopic cylinder (4) is connected to a punching head (6), and the punching head (6) is used to punch holes on the surface of the circuit board. The outer surface of the outer shell (1) is provided with a controller (9) for controlling the operation of the electrical components in the device.

3. The drilling device for circuit board processing according to claim 1, characterized in that, The outer surface of the movable block (3) is fixedly connected to a telescopic cylinder (4), and the output ends of the telescopic cylinder (4) are respectively fixedly connected to a punching head (6) and an extrusion structure (8).

4. The punching device for circuit board processing according to claim 3, characterized in that, The ash collecting structure (7) includes a through hole (71) provided at a low position on the inner side of the support plate (54), a discharge pipe (72) is fixedly connected to the through hole (71) at the lower end of the support plate (54) corresponding to the center line, a guide pipe (73) is fixedly connected between the through hole (71) at the lower end of the support plate (54) corresponding to the non-center line and the discharge pipe (72), a partition (74) is fixedly connected to the inner side of the outer shell (1) corresponding to the lower end of the discharge pipe (72), a strip-shaped hole (75) is provided on the outer surface of the partition (74), and a limiting plate (75) is fixedly connected to the side surface of the discharge pipe (72) near the lower end. 76), the lower end of the corresponding partition (74) inside the outer shell (1) is removably connected to a dust collecting box (77), the two ends of the internal clamping support plate (54) of the outer shell (1) are provided with air duct cavities (78), the cavity formed between the support plates (54) and the support plates (54) is a lower air cavity (712), a filter screen (710) is fixedly connected between the air duct cavity (78) and the recessed groove (55) and the lower air cavity (712), the middle part of the filter screen (710) is fixedly connected to a center frame (79), and the interior of the corresponding air duct cavity (78) of the outer shell (1) is fixedly connected to a blower box (711).

5. The punching device for circuit board processing according to claim 3, characterized in that: The extrusion structure (8) comprises a hollow column (81) fixedly connected to the output end of the telescopic cylinder (4); a sliding column (83) is slidably connected to the inner side of the hollow column (81); a push spring (82) is connected between the top end of the sliding column (83) and the telescopic cylinder (4); and a positioning pad (84) is fixedly connected to the lower end of the sliding column (83).

6. The punching device for printed circuit board processing according to claim 1, wherein, The position of the support plate (54) on the surface of the outer housing (1) is adjusted by the pushing and contraction of the electric cylinder (52). The number of the recessed grooves (55) is several groups and they are parallel to each other. The connecting plate (56) is embedded in the inner side of the outer housing (1), and the connecting plate (56) is slidably connected to the outer housing (1).

7. The punching device for circuit board processing according to claim 6, characterized in that, The support plate (54) is a plate-like structure with protrusions and recesses, and the height of the protrusions is flush with the surface of the outer housing (1). The number of the support plates (54) corresponding to one sliding plate (53) is two groups and they are symmetrically distributed. The punching of different areas of the circuit board is adjusted by the back-and-forth movement of the support plate (54).

8. The punching device for circuit board processing according to claim 4, characterized in that, The material guide pipe (73) is obliquely arranged. The upper ends of the material guide pipe (73) and the material guide pipe (73) are respectively communicated with the corresponding through holes (71). The lower end of the material guide pipe (73) is communicated with the inside of the discharge pipe (72). The lower end opening of the discharge pipe (72) penetrates through the limit plate (76). The limit plate (76) is in an "I"-shaped structure. The opening of the strip-shaped hole (75) is larger than the opening of the discharge pipe (72). The opening length direction of the strip-shaped hole (75) is the direction in which the discharge pipe (72) moves along with the support plate (54).

9. The punching device for circuit board processing according to claim 8, wherein, The lower air chamber (712) is isolated from the ash collection box (77) below the partition plate (74) by the limit plate (76). The number of the air blowing boxes (711) is two groups. The blowing direction of one group of air blowing boxes (711) is from bottom to top, and the other group of air blowing boxes (711) is opposite. The waste dust falling in the through hole (71) is collected through the discharge pipe (72) and the material guide pipe (73). The blowing of the air blowing box (711) promotes the collection of the waste dust.

10. The punching device for circuit board processing according to claim 5, characterized in that, The sliding column (83) slides up and down along the hollow column (81). The upper and lower elastic ends of the positioning cushion block (84) are respectively fixedly connected to the telescopic cylinder (4) and the sliding column (83). The sliding column (83) together with the positioning cushion block (84) is pushed by the pushing spring (82) to realize precise drilling of the circuit board. The number of the extrusion structures (8) is several groups and they are distributed in a circular array.

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