A PCB board accurate leg cutting device

Abstract

This invention discloses a precision lead trimming device for PCB boards, relating to the field of lead cutting technology. It includes a base and a vertically arranged hydraulic cylinder. The bottom of the base is fixedly mounted on the top of the extended end of the hydraulic cylinder. Three judgment blocks are movably arranged on the base, and when the three judgment blocks are in contact, they form a hollow cylindrical structure. The outer side of each judgment block is connected to the inner wall of the base via a return spring. A position determining device is provided inside each judgment block, and a cutting device is provided on the position determining device. The cutting device can cut off leads that extend into the interior of the judgment block. The precision lead trimming device for PCB boards provided by this invention can automatically adapt to the lead cutting position according to the size of the solder joints on the PCB board, thereby ensuring thorough lead removal and guaranteeing product quality.

Description

Technical Field

[0001] This invention relates to the field of pin cutting technology, and in particular to a precise pin cutting device for PCB boards. Background Technology

[0002] Circuit boards are widely used in various industries. After components are assembled and soldered on the circuit board, excess pins are cut off. However, traditional pin cutting often uses a one-cut method, which can lead to damage to solder joints or incomplete pin removal, resulting in poor contact or other problems. Summary of the Invention

[0003] The purpose of this invention is to provide a precise pin cutting device for PCB boards to solve the problems existing in the prior art. It can automatically adapt to the pin cutting position according to the size of the solder joints on the PCB board, thereby ensuring thorough pin removal and guaranteeing product quality.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a PCB board precision lead trimming device, including a base and a vertically arranged hydraulic cylinder. The bottom of the base is fixedly mounted on the top of the extended end of the hydraulic cylinder. Three judgment blocks are movably arranged on the base. When the three judgment blocks are in contact and connected, they can form a hollow cylindrical structure. The outer side of the judgment blocks is connected to the inner sidewall of the base through a return spring. A position determining device is provided inside the judgment block, and a cutting device is provided on the position determining device. The cutting device can cut off the leads that penetrate into the interior of the judgment block.

[0006] Optionally, the judgment block includes an integrally formed vertical part and a horizontal part. The cross-section of the vertical part is an arc-shaped structure, and the horizontal part located at the top of the vertical part is a fan-shaped structure. The top of the horizontal part away from the vertical part has an inclined surface of the fan-shaped structure. So when the three judgment blocks are close together, the concave space formed by their inclined surfaces can facilitate the positioning of the solder points on the circuit board. The position of the pin cutting can be determined according to the size of the conical solder point, thereby ensuring that there will be no false contact caused by over-cutting, or other problems such as packaging, transportation and component loosening caused by under-cutting.

[0007] Optionally, the bottom of the hydraulic cylinder is fixedly mounted on the position adjustment plate, and the bottom of the position adjustment plate is slidably mounted on two symmetrically arranged adjustment slide rails.

[0008] Optionally, the base is provided with six horizontally arranged judgment block movable rails, the six judgment block movable rails are arranged in pairs, and the symmetry lines of the three pairs of judgment block movable rails correspond to the projections of the center lines of the three horizontal parts respectively; each pair of judgment block movable rails is slidably provided with a movable seat, and the judgment block is fixedly set on the movable seat.

[0009] Optionally, the position determining device includes six fixed racks horizontally fixed on the base. The six fixed racks are arranged in pairs, and each pair of judgment blocks has a pair of fixed racks on its inner side. A gear is meshed above each pair of fixed racks. The gear is rotatably mounted on a gear shaft. Both ends of the gear shaft are fixedly connected to the inner wall of the judgment block. A vertically arranged movable rack meshes in the middle of the gear. The lower end of the movable rack extends out of the base through a corresponding channel on the bottom wall of the base. A height block is fixedly connected to the upper side of the movable rack. The end of the height block away from the movable rack is slidably connected to a longitudinal guide rod. The upper end of the longitudinal guide rod is fixedly connected to the bottom wall of the horizontal part of the judgment block. There is a gap between the lower end of the longitudinal guide rod and the inner bottom wall of the base. The cutting device is disposed on the height block.

[0010] Optionally, the cutting device includes a drive rod and a worm gear outer ring disposed between the three height blocks. The center projection of the worm gear outer ring coincides with the center of the base. The drive rod is horizontally arranged and has a driving function. A drive rod is rotatably connected between each two adjacent height blocks. The two ends of the drive rod can slide within the height block, so that when the height block moves horizontally away from or towards the judgment block, the two ends of the drive rod can slide horizontally within the height block to avoid interference. A worm is fixedly disposed on the drive rod, and the inner side of the worm is meshed with the outer side of the worm gear outer ring. An auxiliary ring is also rotatably connected to the outer side of the worm gear outer ring, and the outer side of the auxiliary ring is fixedly connected to the height block. A fixed inner ring is disposed at the lower part of the inner side of the worm gear outer ring, and a support block is fixedly connected to the lower bottom wall of the fixed inner ring. One end of the support block away from the fixed inner ring is movably connected to the height block via a connecting rod. One end of the connecting rod is fixedly connected to the support block, and the other end is movably disposed within the height block, allowing relative sliding within the height block. This enables the height block to move away from or closer to the support block. When the height block moves horizontally away from or closer to the judgment block, one end of the connecting rod remains fixed to the fixed inner ring, while the other end slides horizontally relative to the height block within the height block, ensuring that the fixed inner ring remains stationary without interfering with the horizontal movement of the height block. Four shear blades are provided at the upper end of the fixed inner ring. One side of each shear blade is rotatably connected to the upper end of the fixed inner ring via a round pin, and the other side of each shear blade is rotatably connected to a horizontally arranged arc-shaped rod via a round pin. The end of the arc-shaped rod away from the shear blade is rotatably connected to the inner side of the worm gear outer ring.

[0011] The present invention achieves the following technical effects compared to the prior art:

[0012] The PCB lead trimming device provided by this invention can automatically adapt the lead cutting position according to the size of the solder joint, thereby ensuring product quality. It can also increase the number of devices using a dot matrix method to correspond to a specific PCB model, achieving fast and accurate lead trimming. When the PCB model changes, only the device position needs to be adjusted to change the device under the same dot matrix to the corresponding position of other PCB models, thus achieving switching between lead trimming devices for different PCB models and exhibiting excellent versatility. Specifically, the position determination device can control the actual position of the cutting device according to the actual size of the solder joint, ensuring that each lead is as close as possible to the root of the solder joint. This departs from the traditional one-cut method of lead trimming devices, greatly improving the matching degree between the lead length of each component on the PCB and the solder joint. It avoids the possibility of damage to components during later packaging, transportation, and other processes due to incomplete lead trimming, or problems such as incomplete contact caused by excessive lead trimming. The cutting device uses synchronous inward movement of the cutting blade to keep the lead trimmed at the same vertical direction as the solder joint, thus avoiding solder joint damage caused by deviation from the solder joint during trimming, which could lead to incomplete contact of components. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the PCB board precision lead trimming device of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall structure of the PCB board precision lead trimming device of the present invention from another angle;

[0016] Figure 3 This is a schematic diagram of the internal structure of the PCB board precision lead trimming device of the present invention;

[0017] Figure 4 For the present invention Figure 3 A magnified view of a portion at point C;

[0018] Figure 5 This is a front view of the PCB board precision lead trimming device of the present invention;

[0019] Figure 6 This is a side view of the PCB board precision lead trimming device of the present invention;

[0020] Figure 7 This is a top view of the PCB board precision lead trimming device of the present invention;

[0021] Figure 8 For the present invention Figure 5 AA section view;

[0022] Figure 9 For the present invention Figure 5 This is a sectional view of BB;

[0023] Among them, 10 is the base, 11 is the judgment block, 12 is the reset spring, 13 is the position adjustment plate, 14 is the adjustment slide rail, 15 is the movable rack, 16 is the hydraulic cylinder, 17 is the movable seat, 18 is the movable rail of the judgment block, 19 is the fixed rack, 20 is the gear, 21 is the gear shaft, 22 is the guide rod, 23 is the height block, 24 is the drive rod, 25 is the worm gear, 26 is the auxiliary ring, 27 is the outer ring of the worm gear, 28 is the scissor blade, 29 is the fixed inner ring, 30 is the support block, and 31 is the arc-shaped rod. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a precise pin cutting device for PCB boards to solve the problems existing in the prior art. It can automatically adapt to the pin cutting position according to the size of the solder joint, thereby ensuring that the pins are completely removed and guaranteeing product quality.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Appendix Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, the present invention provides a PCB board precision lead trimming device, including a base 10. The lower outer surface of the base 10 is fixedly connected to the extended end of a hydraulic cylinder 16. The hydraulic cylinder 16 is fixedly connected to a position adjustment plate 13. The position adjustment plate 13 is slidably connected to an adjustment slide rail 14. Pairs of judgment block movable rails 18 are distributed in a ring on the inner bottom wall of the base 10. Movable seats 17 are slidably connected to the judgment block movable rails 18. Judgment blocks 11 are fixedly connected to the movable seats 17. A position determining device is provided inside the judgment block 11 to control the height of the height block 23 according to the size of the solder point. A drive rod 24 with a drive is rotatably connected to the height block 23, and a support block 30 is fixedly connected to it. A worm 25 is fixedly connected to the drive rod 24. The worm 25 meshes with the outer ring 27 of the worm wheel. An auxiliary ring 26 is also rotatably connected to the outer side of the outer ring 27 of the worm wheel. The auxiliary ring 26 is fixedly connected to the height block 23. A cutting device is provided on the inner side of the height block 23. The drive rod 24 is used as a power source to make the scissor blade 28 retract inward to cut off the pin that extends into the middle.

[0028] The position determination device includes a base 10, with the extended end of a hydraulic cylinder 16 fixedly connected to the lower outer surface of the base 10. The hydraulic cylinder 16 is fixedly connected to a position adjusting plate 13, which is slidably connected to an adjusting slide rail 14. Pairs of judgment block movable rails 18 are annularly distributed on the inner bottom wall of the base 10. Movable seats 17 are slidably connected to the judgment block movable rails 18, and judgment blocks 11 are fixedly connected to the movable seats 17. A return spring 12 is fixedly connected to the outer side of each judgment block 11. The other end of the positioning spring 12 is connected to the side wall of the base 10. A fixed rack 19 is fixedly connected to the bottom wall of the base 10 inside the movable rail 18 of the judgment block. The upper side of the fixed rack 19 meshes with the outer side of the gear 20. The gear 20 is rotatably connected to the gear shaft 21. Both ends of the gear shaft 21 are fixedly connected to the inner wall of the judgment block 11. A movable rack 15 meshes with the middle of the gear 20. The lower end of the movable rack 15 extends out of the base 10 through a corresponding channel on the bottom wall of the base 10. The upper side of the movable rack 15 is fixedly connected to the outer side of the base 10. A height block 23 is fixedly connected to a longitudinal guide rod 22. The upper end of the longitudinal guide rod 22 is fixedly connected to the top wall of the judgment block 11, and the lower end does not contact the base 10. When it is necessary to cut off the pins on the solder joint, the hydraulic cylinder 16 is activated to extend. The extension of the hydraulic cylinder 16 will push the base 10 upward as a whole, so that the judgment block 11 contacts the solder joint of the circuit board. Depending on the size of the solder joint, the judgment block 11 will move outward by different distances under the guidance of the judgment block movable rail 18, overcoming the elastic force of the reset spring 12. The movement of the judgment block 11 will drive the gear 20 to move. Since the gear 20 meshes with the fixed rack 19, the gear 20 will rotate during the movement. The rotation of the gear 20 will drive the movable rack 15 meshing with it to move downward. The downward movement of the movable rack 15 will cause the height block 23 to move along its set direction under the guidance of the longitudinal guide rod 22, thereby driving the cutting device to move different distances according to the size of the solder joint on the PCB board.

[0029] The cutting device includes a height block 23, on which a drive rod 24 is rotatably connected. The height block 23 can slide horizontally towards or away from the ends of the drive rod 24. A support block 30 is slidably connected to the height block 23 via a connecting rod. A worm gear 25 is fixedly connected to the drive rod 24, meshing with an outer ring 27 of a worm wheel. An auxiliary ring 26 is rotatably connected to the outer side of the outer ring 27 of the worm wheel, and is fixedly connected to the height block 23. The other end of the support block 30 is fixedly connected to the lower bottom wall of a fixed inner ring 29, so that the support block 30 and the fixed inner ring 29 can always remain stationary. When the height block 23 moves horizontally towards or away from the support block 30, the connecting rod slides relative to its connecting end, allowing the height block 23 to move away from or towards the support block 30 without interfering with each other. The upper end of ring 29 is rotatably connected to one side of the shear blade 28 via a round pin. The other side of the shear blade 28 is rotatably connected to the arc-shaped rod 31 via a round pin. The other end of the arc-shaped rod 31 is rotatably connected to the inner side of the worm gear outer ring 27. After the position determining device S1 completes the positioning, the drive rod 24 can be started to rotate. The rotation of the drive rod 24 will drive the worm gear 25 to rotate the worm gear outer ring 27. Since the fixed inner ring 29 is fixedly connected to the support block 30, the rotation of the shear blade 28 will move around the round pin on the fixed inner ring 29 as the axis. The rotation of the worm gear outer ring 27 will drive the shear blade 28 to rotate around the round pin at the other end via the arc-shaped rod 31. As the rotation angle increases, the centers of the four shear blades 28 with irregular fan-shaped structures will completely close together, thereby cutting off the protruding pins.

[0030] This invention can cut off other pins by controlling the position of the position adjustment plate 13 on the adjustment slide rail 14, or by increasing the number of devices in a dot matrix manner to correspond to a certain type of circuit board, thereby achieving fast and accurate pin cutting. When the circuit board model changes, it is only necessary to adjust the position of the device to change the device under the same dot matrix to the corresponding position of other circuit boards, thereby realizing the switching of pin cutting devices for different types of circuit boards, and has very good universality.

[0031] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A PCB board precision lead trimming device, characterized in that: The device includes a base and a vertically arranged hydraulic cylinder. The bottom of the base is fixedly mounted on the top of the extended end of the hydraulic cylinder. Three judgment blocks are movably mounted on the base. When the three judgment blocks are in contact and connected, they can form a hollow cylindrical structure. The outer side of each judgment block is connected to the inner wall of the base via a return spring. A position determining device is provided inside each judgment block, and the position determining device is equipped with a cutting device that can cut off the pins that penetrate into the interior of the judgment block. Each judgment block includes an integrally formed vertical part and a horizontal part. The cross-section of the vertical part is an arc-shaped structure, located at the top of the vertical part. The horizontal section has a fan-shaped structure, and the top of the horizontal section away from the vertical section has an inclined surface of the fan-shaped structure. Six horizontally arranged judgment block movable rails are arranged around the base, with each of the six judgment block movable rails paired in pairs. The symmetry lines of the three pairs of judgment block movable rails correspond one-to-one with the projections of the center lines of the three horizontal sections. Each pair of judgment block movable rails has a movable seat slidably mounted on it, and the judgment block is fixedly mounted on the movable seat. The position determining device includes six fixed racks horizontally fixed around the base, with each of the six fixed racks paired in pairs. Each side is provided with a pair of fixed racks, and a gear is meshed above each pair of fixed racks. The gears are rotatably mounted on a gear shaft, and both ends of the gear shaft are fixedly connected to the inner wall of the judgment block. A vertically arranged movable rack meshes with the middle of the gear. The lower end of the movable rack extends out of the base through a corresponding channel on the bottom wall of the base. A height block is fixedly connected to the upper side of the movable rack. The end of the height block away from the movable rack is slidably connected to a longitudinal guide rod. The upper end of the longitudinal guide rod is fixedly connected to the bottom wall of the horizontal part of the judgment block, and the lower end of the longitudinal guide rod is connected to the base. A gap exists between the inner bottom walls, and the cutting device is disposed on the height block; the cutting device includes a drive rod and a worm gear outer ring disposed between the three height blocks, the center projection of the worm gear outer ring coincides with the center of the base, the drive rod is horizontally disposed and has a driving function, and a drive rod is rotatably connected between each two adjacent height blocks, the two ends of the drive rod can slide within the height block, a worm is fixedly disposed on the drive rod, the inner side of the worm is meshed with the outer side of the worm gear outer ring, and an auxiliary ring is also rotatably connected to the outer side of the worm gear outer ring, the outer side of the auxiliary ring is fixedly connected to the height block;A fixed inner ring is provided on the lower inner side of the outer ring of the worm gear. A support block is fixedly connected to the lower bottom wall of the fixed inner ring. The end of the support block away from the fixed inner ring is movably connected to the height block, which can move away from or towards the support block. Four shear blades are provided on the upper end of the fixed inner ring. One side of each shear blade is rotatably connected to the upper end of the fixed inner ring via a round pin. The other side of each shear blade is rotatably connected to a horizontally arranged arc-shaped rod via a round pin. The end of the arc-shaped rod away from the shear blade is rotatably connected to the inner side of the outer ring of the worm gear.

2. The PCB board precision lead trimming device according to claim 1, characterized in that: The bottom of the hydraulic cylinder is fixedly mounted on the position adjustment plate, and the bottom of the position adjustment plate is slidably mounted on two symmetrically arranged adjustment slide rails.

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