Secondary back drilling device for PCB (printed circuit board) via holes

Abstract

The utility model relates to a secondary back drilling device for a PCB (printed circuit board) via hole, which comprises a mounting frame body, first electric push rods are embedded on two sides of the mounting frame body, a clamping seat for fixing a PCB is fixed on a piston rod of each first electric push rod, first electric slide rail slide seats are symmetrically fixed on the mounting frame body along the front-back direction, and a second electric slide rail slide seat is fixed on the mounting frame body along the front-back direction. A movable frame is fixed to a first sliding seat of the first electric sliding rail sliding seat, a bottom frame is fixed to the side, away from each other, of the first sliding seat of the first electric sliding rail sliding seat, and chippings and disintegrating slag on the surface and the bottom of a PCB can be rapidly adsorbed and collected by arranging an auxiliary assembly and utilizing a two-position synchronous adsorption mode; according to the PCB cleaning device, through holes are formed in the through holes, the chips and the disintegrating slag in the through holes are rapidly flushed out, adsorbed and collected in the follow-up process in a one-flushing and one-sucking mode, the overall cleaning effect on the PCB is improved, the situation that the chips and the disintegrating slag are prone to being left on the surface of the PCB and in the through holes can be effectively avoided, and follow-up normal use of the PCB is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of back drilling devices, in particular to a secondary back drilling device for PCB board via holes. Background Art

[0002] Back drilling devices are mainly used in the process of PCB board manufacturing to remove the conductive via stubs of copper cylinders in PCB vias by controllable depth drilling, so as to solve the signal integrity problem in high-speed design. Such devices re-drill with a slightly larger drill bit to remove most of the via stubs, thereby controlling the back drilling depth, approaching but not touching the last layer used by the hole, and ensuring that the ideal remaining stub is less than 10 mils.

[0003] During the drilling process of the secondary back drilling device for PCB board via holes, debris and slag will be generated. However, the traditional secondary back drilling device for PCB board via holes has a poor cleaning effect on debris and slag, and can only clean the debris and slag falling on one side of the PCB board. However, for the debris and slag on the other side of the PCB board and in the via holes, they cannot be quickly cleaned, which will directly affect the subsequent use of the PCB board. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages in the prior art that the cleaning effect on debris and slag is poor, and only the debris and slag falling on one side of the PCB board can be cleaned, but the debris and slag on the other side of the PCB board and in the via holes cannot be quickly cleaned, and a secondary back drilling device for PCB board via holes is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A secondary back drilling device for PCB board via holes, including a mounting frame body. Both sides of the mounting frame body are embedded with first electric push rods. The piston rod of the first electric push rod is fixed with a clamp seat for fixing the PCB board. The mounting frame body is symmetrically fixed with first electric slide rail seats along the front-back direction. A moving frame is fixed on the first slide seat of the first electric slide rail seat. A bottom frame is fixed on the side of the first slide seats of the first electric slide rail seat away from each other. A second electric slide rail seat is fixed on the moving frame. An extension frame slidably arranged on the moving frame is fixed on the second slide seat of the second electric slide rail seat. A second electric push rod is embedded in the extension frame. The piston rod of the second electric push rod is fixed with a motor. A drill rod is fixed on the output shaft of the motor. An auxiliary component is arranged on the moving frame, the bottom frame and the motor.

[0007] Preferably, the auxiliary component includes an aggregate bin fixed to the front of the moving frame. A air pump is fixed to the front of the aggregate bin, and the air inlet end of the air pump is connected to the aggregate bin. A filter screen cooperating with the air inlet end of the air pump is fixed to the left side of the top of the aggregate bin. An installation ring is fixed to the motor, and a protective cover for shielding the drill pipe is slidably arranged on the installation ring. Fixed frames are fixed to the front, back and right sides of the protective cover. A first spring is fixed to the side where the fixed frame and the extension frame are close to each other. The bottoms of the front and back of the protective cover communicate with a first three-way pipe. A second three-way pipe is connected to the aggregate bin, and the end of the first three-way pipe away from the protective cover is connected to the second three-way pipe. The top of the first three-way pipe is fixed to the bottom of the extension frame. A third electric slide rail slider is fixed to the bottom of the inner cavity of the bottom frame. A convex plate is arranged on one side of the third electric slide rail slider. A fixed pipe is inserted into the convex plate. A dust suction hood is connected to the fixed pipe. Disks are fixed to the top and bottom of the fixed pipe. A second spring is wound around the fixed pipe, and both ends of the second spring are fixed to the sides where the convex plate and the upper disk are close to each other. The end of the second three-way pipe away from the first three-way pipe and the aggregate bin penetrates the bottom disk and is connected to the fixed pipe. The two ends of the second three-way pipe away from the aggregate bin are fixed to the moving frame and the bottom frame. The air outlet end of the air pump is connected to a third three-way pipe, and one end of the third three-way pipe is connected to the second three-way pipe. First solenoid valves are arranged at both ends of the third three-way pipe away from the air pump. A second solenoid valve is arranged at the end of the second three-way pipe close to the aggregate bin. A third solenoid valve is arranged at the end of the second three-way pipe close to the third three-way pipe, and the third solenoid valve is located on the side where the first solenoid valve and the second solenoid valve are close to each other. The end of the first three-way pipe away from the protective cover and the two ends of the second three-way pipe away from the aggregate bin are both of telescopic pipe structures.

[0008] Preferably, two groups of limiting rods are sequentially inserted into the convex plate in the left-right direction. The fixed pipe is located on the side where the limiting rods are close to each other. Both ends of each group of limiting rods are fixed to the sides where the disks are close to each other.

[0009] Preferably, a vertical rod cooperating with the first spring is inserted into each fixed frame. Both ends of the vertical rod are fixed to the sides where the extension frame and the installation ring are close to each other.

[0010] Preferably, the dust suction hood is directly below the protective cover, and the centers of the dust suction hood and the protective cover are located on the same vertical axis.

[0011] Preferably, there is a height difference between the bottom of the protective cover and the bottom of the drill pipe.

[0012] Preferably, a fixed slideway is opened at the top of the right side of the moving frame, and a fixed slide bar capable of sliding in the fixed slideway is fixed to the extension frame.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The secondary back drilling device for the through hole of the PCB board can make the protective cover and the dust cover close to the top and bottom of the through hole on the PCB board by setting the auxiliary component and setting the elastic rebound of the first spring and the second spring, so as to prevent the debris from spreading outward when the drill rod is working, and use the air pump to provide the air source, so as to quickly draw the inside of the collection box into a vacuum state, so that the inside of the collection box can quickly form a negative pressure state, so that the debris and slag can be quickly transported to the collection box for collection by using the traction force, and the design of the filter screen can prevent the debris and slag from entering the air pump and damaging it, and the design of the second electric push rod can control the drill rod to separate from the through hole after drilling, and keep a certain distance from the PCB board, and at this time, the protective cover will still be attached to the PCB board under the action of the first spring, and through the first solenoid valve and the second solenoid valve The design of the second and third solenoid valves can control the opening and closing ends of the second and third three-way pipes, so that the gas discharged by the air pump can be transported to the fixed pipe and the dust hood through the second three-way pipe, thereby forming a certain impact force, which can quickly flush the debris and slag in the through hole out of the through hole, and under the suction of the first three-way pipe above, the flushed debris and slag can be quickly drawn into the collection box for collection. At this time, the debris and slag on the surface and bottom of the PCB board can be quickly adsorbed and collected by using the two-place synchronous adsorption method, and subsequently the debris and slag in the through hole can be quickly flushed out and adsorbed and collected by using the one-flushing-one-suction method, thereby improving the overall cleaning effect of the PCB board, and effectively preventing the debris and slag from being easily retained on the surface of the PCB board and in the through hole, so as to avoid affecting the subsequent normal use of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a secondary back drilling device for a PCB board through hole proposed by the utility model;

[0016] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0017] Figure 3 A partial three-dimensional diagram of the structure of the auxiliary component proposed by the utility model;

[0018] Figure 4 The utility model is a partial upward cross-sectional view of the structure of a secondary back drilling device for a PCB board through hole proposed by the utility model.

[0019] In the figure: 1, mounting frame; 2, first electric push rod; 3, clamping seat; 4, first electric slide rail slider; 5, moving frame; 6, second electric slide rail slider; 7, extension frame; 8, second electric push rod; 9, motor; 10, drill pipe; 11, chassis; 12, mounting ring; 13, protective cover; 14, vertical rod; 15, fixing frame; 16, first spring; 17, first three-way pipe; 18, second three-way pipe; 19, aggregate box; 20, air pump; 21, filter screen; 22, third three-way pipe; 23, first solenoid valve; 24, second solenoid valve; 25, third solenoid valve; 26, fixed pipe; 27, dust suction hood; 28, limiting rod; 29, disc; 30, second spring; 31, third electric slide rail slider; 32, convex plate. Specific embodiments

[0020] 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.

[0021] Embodiment

[0022] Referring to Figure 1 and Figure 4 A secondary back drilling device for PCB board via holes includes a mounting frame 1. A controller is provided on the front of the bottom on the right side of the mounting frame 1. First electric push rods 2 are embedded on both sides of the mounting frame 1. The piston rod of the first electric push rod 2 is fixed with a clamping seat 3 for fixing the PCB board. First electric slide rail sliders 4 are symmetrically fixed on the mounting frame 1 in the front-rear direction. A moving frame 5 is fixed on the first slide of the first electric slide rail slider 4. A chassis 11 is fixed on the side of the first slide of the first electric slide rail slider 4 away from each other. A second electric slide rail slider 6 is fixed on the moving frame 5. An extension frame 7 slidably arranged on the moving frame 5 is fixed on the second slide of the second electric slide rail slider 6. A fixed slideway is opened at the top on the right side of the moving frame 5. A fixed slide bar capable of sliding in the fixed slideway is fixed on the extension frame 7. The design of the fixed slideway and the fixed slide bar improves the stability of the extension frame 7 during movement and prevents one end of the extension frame 7 from dropping due to excessive weight. A second electric push rod 8 is embedded on the extension frame 7. The piston rod of the second electric push rod 8 is fixed with a motor 9. The output shaft of the motor 9 is fixed with a drill pipe 10. The design of the first electric slide rail slider 4, the second electric slide rail slider 6, the second electric push rod 8 and the motor 9 can freely change the position of the rotatable drill pipe 10 according to the drilling requirements;

[0023] Referring to Figure 1 and Figure 2, an auxiliary component is provided on the moving frame 5, the bottom frame 11 and the motor 9. The auxiliary component includes an aggregate box 19 fixed to the front of the moving frame 5. An air pump 20 is fixed to the front of the aggregate box 19, and the air inlet end of the air pump 20 is communicated with the aggregate box 19. A filter screen 21 that cooperates with the air inlet end of the air pump 20 is fixed to the left side of the top of the aggregate box 19. An installation ring 12 is fixed to the motor 9, and a protective cover 13 that shields the drill rod 10 is slidably arranged on the installation ring 12. There is a height difference between the bottom of the protective cover 13 and the bottom of the drill rod 10. The design of the height difference enables the protective cover 13 to contact the PCB board in advance, so as to improve the shielding effect and prevent debris from spreading to the outside. Fixed frames 15 are fixed to the front, back and right sides of the protective cover 13. A first spring 16 is fixed to the side where the fixed frame 15 and the extension frame 7 are close to each other. A vertical rod 14 that cooperates with the first spring 16 is inserted into each group of fixed frames 15. Both ends of the vertical rod 14 are fixed to the sides where the extension frame 7 and the installation ring 12 are close to each other. The design of the vertical rod 14 can slide and limit the protective cover 13 and the first spring 16, prevent the protective cover 13 from tilting excessively during movement, and prevent the first spring 16 from arching to one side when compressed. The bottoms of the front and back of the protective cover 13 are communicated with a first three-way pipe 17. A second three-way pipe 18 is communicated with the aggregate box 19, and the end of the first three-way pipe 17 away from the protective cover 13 is communicated with the second three-way pipe 18. The top of the first three-way pipe 17 is fixed to the bottom of the extension frame 7, and the debris and slag on the top and bottom of the PCB board can be adsorbed and cleaned by using negative pressure;

[0024] Refer to Figure 1 , Figure 3 and Figure 4, a third electric slide rail slider 31 is fixed to the bottom of the inner cavity of the chassis 11. A convex plate 32 is provided on one side of the third electric slide rail slider 31. A fixed pipe 26 is inserted into the convex plate 32. A dust suction hood 27 is communicated with the fixed pipe 26. The dust suction hood 27 is located directly below the protective cover 13. The centers of the dust suction hood 27 and the protective cover 13 are located on the same vertical axis. The limitation of the positions of the dust suction hood 27 and the protective cover 13 improves the cleaning effect on the debris and slag in the guide through holes. Disks 29 are fixed to both the top and bottom of the fixed pipe 26. A second spring 30 is wound around the fixed pipe 26, and both ends of the second spring 30 are fixed to the sides of the convex plate 32 and the upper disk 29 that are close to each other. One end of the second three-way pipe 18 away from the first three-way pipe 17 and the aggregate box 19 penetrates the bottom disk 29 and is communicated with the fixed pipe 26. Two groups of limit rods 28 are inserted into the convex plate 32 in the left-right direction in sequence. The fixed pipe 26 is located on the side where the limit rods 28 are close to each other. Both ends of each group of limit rods 28 are fixed to the sides of the disks 29 that are close to each other. By providing the limit rods 28, the sliding limit of the fixed pipe 26 can be realized, the stability of the fixed pipe 26 during movement is improved, and the rotation of the fixed pipe 26 during movement is avoided. The two ends of the second three-way pipe 18 away from the aggregate box 19 are fixed to the moving frame 5 and the chassis 11. The air outlet end of the air pump 20 is communicated with a third three-way pipe 22, and one end of the third three-way pipe 22 is communicated with the second three-way pipe 18. First solenoid valves 23 are provided at both ends of the third three-way pipe 22 away from the air pump 20. A second solenoid valve 24 is provided at the end of the second three-way pipe 18 close to the aggregate box 19. A third solenoid valve 25 is provided at the end of the second three-way pipe 18 close to the third three-way pipe 22, and the third solenoid valve 25 is located on the side where the first solenoid valve 23 and the second solenoid valve 24 are close to each other. One end of the first three-way pipe 17 away from the protective cover 13 and the two ends of the second three-way pipe 18 away from the aggregate box 19 are both of telescopic pipe structures. By providing the auxiliary assembly and using the method of synchronous adsorption at two places, the debris and slag on the surface and bottom of the PCB board can be quickly adsorbed and collected, and in the subsequent process, by using the method of one flushing and one suction, the debris and slag in the guide through holes can be quickly flushed out and adsorbed and collected, improving the overall cleaning effect on the PCB board, effectively avoiding the easy retention of debris and slag on the surface and in the guide through holes of the PCB board, and avoiding affecting the subsequent normal use of the PCB board.

[0025] In the present invention, the user places the required PCB board on the side where the clamp seat 3 is close to each other. At this time, the bottom of the PCB board is attached to the dust cover 27 and pressed down a certain distance. At this time, the elastic rebound of the second spring 30 can make the dust cover 27 close to the bottom of the PCB board. Then the user uses the controller to turn on the first electric push rod 2, so as to control the clamp seat 3 to move inward to fix the two ends of the PCB board. Then the user turns on the first electric slide rail 4, the second electric slide rail 6 and the third electric slide rail 31 through the controller, so as to adjust the conduction according to the conduction. The drill rod 10, the protective cover 13 and the dust cover 27 are synchronously moved to the corresponding positions of the hole, and then the user turns on the second electric push rod 8 and the motor 9 through the controller, so as to drive the motor 9 and the protective cover 13 to move downward, and the motor 9 will drive the drill rod 10 to rotate, and under the elastic support of the first spring 16, the protective cover 13 will contact the PCB board in advance and cover the conductive hole. As the motor 9 continues to move downward, the drill rod 10 can start the secondary back drilling operation. At this time, the protective cover 13 and the dust cover 27 can block the debris at the top and bottom, and at this time The user turns on the air pump 20, the second solenoid valve 24, the third solenoid valve 25 and the first solenoid valve 23 at the transverse position of the third three-way pipe 22 through the controller. At this time, the air pump 20 can quickly extract the air in the collection box 19 and keep the interior of the collection box in a negative pressure state. At this time, the traction force can be used to quickly transport the debris and slag to the collection box 19 through the first three-way pipe 17 and the second three-way pipe 18 for collection. At the same time, the filter screen 21 can block the debris and slag. After the drilling is completed, the user controls the drill rod 10 to disengage from the guide hole through the second electric push rod 8 and keep it aligned with the PCB board. A certain distance is maintained, and at this time, the protective cover 13 will still be attached to the PCB board under the action of the first spring 16. At this time, the user closes the opened valve and opens the first solenoid valve 23 at the longitudinal position of the third three-way pipe 22. At this time, the air pump 20 can transport the exhausted gas to the fixed pipe 26 and the dust cover 27 through the lower half of the second three-way pipe 18, and form a certain impact force, so that the debris and slag in the conducting hole can be quickly flushed out of the conducting hole, and under the suction force of the first three-way pipe 17 above, the flushed debris and slag can be quickly drawn into the collecting box 19 for collection.

[0026] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A secondary back drilling device for a PCB board via hole, comprising a mounting frame (1), characterized in that: A first electric push rod (2) is embedded on both sides of the mounting frame (1); a piston rod of the first electric push rod (2) is fixed with a clamping seat (3) for fixing the PCB board; a first electric slide rail seat (4) is symmetrically fixed on the mounting frame (1) along the front-back direction; a moving frame (5) is fixed on the first slide seat of the first electric slide rail seat (4); a base frame (11) is fixed on the side of the first slide seat of the first electric slide rail seat (4) away from each other; a second electric slide rail seat (6) is fixed on the moving frame (5); an extension frame (7) slidably arranged on the moving frame (5) is fixed on the second slide seat of the second electric slide rail seat (6); a second electric push rod (8) is embedded on the extension frame (7); a motor (9) is fixed on the piston rod of the second electric push rod (8); a drill rod (10) is fixed on the output shaft of the motor (9); and auxiliary components are arranged on the moving frame (5), the base frame (11) and the motor (9).

2. A secondary back drilling device for a PCB via hole according to claim 1, characterized in that: The auxiliary component comprises a material collecting box (19) fixed on the front of the mobile frame (5), an air pump (20) is fixed on the front of the material collecting box (19) and the air inlet end of the air pump (20) is connected to the material collecting box (19), a filter screen (21) used in conjunction with the air inlet end of the air pump (20) is fixed on the left side of the top of the material collecting box (19), a mounting ring (12) is fixed on the motor (9), a protective cover (13) for shielding the drill rod (10) is slidably provided on the mounting ring (12), a fixing frame (15) is fixed on the front, back and right side of the protective cover (13), and the fixing frame (15) and the extension frame (7) are fixed on one side close to each other. A first spring (16) is fixed, the bottom of the front and back sides of the protective cover (13) are connected to a first three-way pipe (17), the collecting box (19) is connected to a second three-way pipe (18), and one end of the first three-way pipe (17) away from the protective cover (13) is connected to the second three-way pipe (18), the top of the first three-way pipe (17) is fixed to the bottom of the extension frame (7), the bottom of the inner cavity of the base frame (11) is fixed to a third electric slide rail seat (31), a convex plate (32) is provided on one side of the third electric slide rail seat (31), a fixed pipe (26) is inserted on the convex plate (32), and a dust cover ( 27), a disc (29) is fixed to the top and bottom of the fixed tube (26), a second spring (30) is wound on the fixed tube (26), and the two ends of the second spring (30) are fixed to the side where the convex plate (32) and the upper disc (29) are close to each other, the end of the second three-way tube (18) away from the first three-way tube (17) and the material collection box (19) passes through the bottom disc (29) and is connected to the fixed tube (26), the two ends of the second three-way tube (18) away from the material collection box (19) are fixed to the movable frame (5) and the bottom frame (11), the air outlet end of the air pump (20) is connected to the third three-way tube (22), and the third three-way tube (22) ) is connected to the second three-way pipe (18), both ends of the third three-way pipe (22) away from the air pump (20) are provided with a first solenoid valve (23), one end of the second three-way pipe (18) close to the material collection box (19) is provided with a second solenoid valve (24), one end of the second three-way pipe (18) close to the third three-way pipe (22) is provided with a third solenoid valve (25), and the third solenoid valve (25) is located on a side where the first solenoid valve (23) and the second solenoid valve (24) are close to each other, and one end of the first three-way pipe (17) away from the protective cover (13) and both ends of the second three-way pipe (18) away from the material collection box (19) are in a telescopic tube structure.

3. A secondary back drilling device for a PCB via hole according to claim 2, characterized in that: Two groups of limiting rods (28) are sequentially inserted on the convex plate (32) along the left and right directions, the fixing tube (26) is located on the side where the limiting rods (28) are close to each other, and the two ends of each group of limiting rods (28) are fixed on the side where the disc (29) is close to each other.

4. A secondary back drilling device for a PCB via hole according to claim 2, characterized in that: Each set of the fixing frames (15) is provided with a vertical rod (14) used in conjunction with a first spring (16), and both ends of the vertical rod (14) are fixed to a side where the extension frame (7) and the mounting ring (12) are close to each other.

5. A secondary back drilling device for a PCB via hole according to claim 2, characterized in that: The dust hood (27) is located directly below the protective hood (13), and the centers of the dust hood (27) and the protective hood (13) are located on the same vertical axis.

6. A secondary back drilling device for a PCB via hole according to claim 2, characterized in that: There is a height difference between the bottom of the protective cover (13) and the bottom of the drill rod (10).

7. A secondary back drilling device for a PCB via hole according to claim 1, characterized in that: A fixed slideway is provided at the top of the right side of the movable frame (5), and a fixed slide bar capable of sliding in the fixed slideway is fixed on the extension frame (7).

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