Pneumatic clamp with stable clamping force

Abstract

The utility model discloses an air clamp with stable clamping force, which comprises a base, an air cylinder is fixedly connected on the base, a slot position is arranged on the base, a wedge plate is in sliding contact in the slot position, the wedge plate abuts against the inner wall of one side of the slot position, an output shaft of the air cylinder is connected with the wedge plate, a first clamping plate is in sliding connection in the slot position, and a second clamping plate is arranged in the first clamping plate. The wedge plate and the first clamping plate extend to form wedge blocks, the wedge blocks of the wedge plate abut against the wedge blocks of the first clamping plate, the sliding path of the wedge plate is perpendicular to the sliding path of the first clamping plate, and a clamping area is formed between the first clamping plate and the inner wall of the other side of the groove position. According to the air clamp stable in clamping force, the air cylinder pushes the first clamping plate to clamp a pin through the wedge plate, and the working pressure of the air cylinder is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic clamps, and in particular to a pneumatic clamp with stable clamping force. Background Technology

[0002] In the precision machining of PCB boards, the drilling positioning accuracy directly affects the alignment of the hole position with the circuit layout and the yield of finished products. In the existing technology, multiple pneumatic clamps are installed on the worktable, and compressed air is used to drive the clamping of positioning pins. The positioning pins contact the edge of the PCB board to form a space that constrains the PCB board.

[0003] However, such pneumatic clamping solutions have significant drawbacks. Pneumatic clamps rely on continuous air pressure to maintain clamping force. During long-term continuous operation, the air pressure gradually decreases due to aging of seals or micro-leakage in the pipeline, which reduces the clamping force of the pneumatic clamp on the positioning pin. The constraint force of the positioning pin on the PCB board decreases, resulting in micro-displacement of the PCB board, which restricts the production quality of the PCB board in micro-hole and high-precision manufacturing. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic clamp with stable clamping force, wherein the cylinder pushes the first clamping plate through the wedge plate to clamp the pin, thereby reducing the working pressure of the cylinder.

[0005] The technical solution adopted by the pneumatic clamp with stable clamping force disclosed in this utility model is:

[0006] The device includes a base, on which a cylinder is fixedly connected. A slot is provided on the base, and a wedge plate slides in contact with the slot. The wedge plate abuts against the inner wall of one side of the slot. The output shaft of the cylinder is connected to the wedge plate. A first clamping plate slides in the slot. Both the wedge plate and the first clamping plate have wedge blocks extending from them. The wedge block of the wedge plate abuts against the wedge block of the first clamping plate. The sliding path of the wedge plate is perpendicular to the sliding path of the first clamping plate. A clamping area is formed between the first clamping plate and the inner wall of the other side of the slot.

[0007] As a preferred embodiment, multiple limiting posts extend into the groove, and a sliding groove is provided on the first clamping plate, with the limiting posts placed in the sliding groove for sliding contact.

[0008] As a preferred embodiment, a connecting block is fixedly connected to the output shaft of the cylinder, a protrusion extends from the connecting block, and a slot is provided at one end of the wedge plate, with the protrusion being fixedly engaged in the slot.

[0009] As a preferred embodiment, the base is provided with a receiving groove that communicates with the slot, one end of the wedge plate passes through the receiving groove from the connection between the slot and the receiving groove, and the cylinder is located in the receiving groove.

[0010] As a preferred embodiment, a second clamping plate is fixedly connected to the inner wall on the other side of the slot, and the clamping area is located between the first clamping plate and the second clamping plate.

[0011] As a preferred embodiment, a return spring is also included, with its two ends respectively contacting the first clamping plate and the second clamping plate.

[0012] As a preferred embodiment, the bottom of the slot is provided with a groove, which is close to the clamping area;

[0013] As a preferred embodiment, a dust cover is also included, which covers the first clamping plate, the wedge plate, and the receiving groove, and the dust cover is fixedly connected to the limiting post.

[0014] The beneficial effects of the pneumatic clamp with stable clamping force disclosed in this utility model are:

[0015] The positioning pin is placed in the clamping area. The output shaft of the cylinder applies a longitudinal thrust to the wedge plate, causing the wedge plate to slide a certain distance in the groove. The wedge plate slides between the first clamping plate and the inner wall of one side of the groove. The wedge block of the wedge plate slides on the wedge block of the first clamping plate, thereby pushing the first clamping plate to slide laterally in the groove to reduce the width of the clamping area and achieve the clamping of the positioning pin. Since the sliding path of the wedge plate is perpendicular to the sliding path of the first clamping plate, the force for clamping the positioning pin is the lateral constraint force applied to the wedge plate by the inner wall of one side of the groove. The friction between the wedge block of the wedge plate and the wedge block of the first clamping plate and the friction between the wedge plate and the inner wall of the groove creates a self-locking effect on the wedge plate. This allows the cylinder to apply only a small longitudinal thrust to the wedge plate to constrain the wedge block to the current position, enabling the pneumatic clamp to maintain a stable clamping force while reducing the working pressure of the cylinder. Furthermore, the positioning pin can be moved longitudinally back and forth in the clamping area before being clamped to adjust its position and readjust the zero position of the replaced positioning pin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a pneumatic clamp with stable clamping force according to the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of a dust cover plate for a pneumatic clamp with stable clamping force according to this utility model.

[0018] Figure 3 This is a schematic diagram of the installation of the first clamping plate, the second clamping plate, and the cylinder of a pneumatic clamp with stable clamping force according to this utility model.

[0019] Figure 4 This is a cross-sectional view of a pneumatic clamp with stable clamping force according to this utility model.

[0020] Figure 5This is a schematic diagram of the structure of a pneumatic clamp with stable clamping force, where the first and second clamping plates are released.

[0021] Figure 6 This is a schematic diagram of the structure of the first and second clamping plates of a pneumatic clamp with stable clamping force according to this utility model. Detailed Implementation

[0022] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0023] Please refer to Figures 1-3 .

[0024] This utility model discloses a pneumatic clamp with stable clamping force, including a base 1, a return spring 14 and a dust cover 15;

[0025] The top of the base 1 has a slot 11 and a receiving slot 12, which are connected to each other. The bottom of the base 1 has a mounting hole 121, which is connected to the receiving slot 12. A cylinder 13 is fixedly connected to the base 1. The cylinder 13 is located in the receiving slot 12. The air pipe of the external air injection mechanism can pass through the mounting hole 121 into the receiving slot 12 and communicate with the cylinder 13. The external air injection mechanism provides high-pressure air for the cylinder 13 to operate.

[0026] Furthermore, a connecting block 131 is fixedly connected to the output shaft of the cylinder 13, and a protrusion 132 extends from the connecting block 131. The connecting block 131 is close to the connection between the slot 11 and the receiving slot 12.

[0027] A wedge plate 2 is slidably contacted in the slot 11. One side of the wedge plate 2 abuts against the inner wall of one side of the slot 11. A slot 211 is provided at one end of the wedge plate 2. One end of the wedge plate 2 passes through the receiving slot 12 from the connection between the slot 11 and the receiving slot 12. The protrusion 132 is fixed in the slot 211. A screw is provided on the wedge plate 2. The screw passes through the wedge plate 2 and is fixedly connected to the connecting block 131.

[0028] The output shaft of cylinder 13 pulls or pushes wedge plate 2 to slide back and forth in slot 11 via connecting block 131; the output shaft of cylinder 13 is parallel to the sliding path of wedge plate 2 in slot 11.

[0029] Please refer to Figures 1-4 .

[0030] Multiple limiting posts 111 extend into the slot 11. In this embodiment, four limiting posts 111 are preferably arranged at intervals within the slot 11. A first clamping plate 3 is slidably connected within the slot 11. A sliding groove 311 is provided on the first clamping plate 3, and the sliding groove 311 penetrates through the first clamping plate 3. In this embodiment, four sliding grooves 311 are preferably provided, and the four sliding grooves 311 correspond to the four limiting posts 111. The limiting posts 111 pass through the sliding grooves 311, and the outer side of the limiting posts 111 is placed in sliding contact with the inner wall of the sliding grooves 311. The limiting posts 111 constrain the sliding path of the first clamping plate 3 through the sliding grooves 311.

[0031] Furthermore, the sliding path of the wedge plate 2 is perpendicular to the sliding path of the first clamping plate 3, so that when the first clamping plate 3 slides and resets in the groove 11, it pushes the wedge plate 2 to touch the inner wall of one side of the groove 11; wedge blocks 22 extend from the other side of the wedge plate 2 and the first clamping plate 3, the wedge blocks 22 of the wedge plate 2 and the wedge blocks 22 of the first clamping plate 3 are opposite to each other, and the wedge blocks 22 of the wedge plate 2 touch the wedge blocks 22 of the first clamping plate 3, so that the wedge surface of the wedge block 22 of the wedge plate 2 slides in contact with the wedge surface of the wedge block 22 of the first clamping plate 3.

[0032] Please refer to Figures 1-6 .

[0033] A second clamping plate 4 is fixedly connected to the inner wall on the other side of the slot 11. A clamping area 32 is formed between the other side of the first clamping plate 3 and the inner wall on the other side of the slot 11. The clamping area 32 is located between the other side of the first clamping plate 3 and one side of the second clamping plate 4.

[0034] Furthermore, a groove 112 is provided at the bottom of the groove 11, and the groove 112 is close to the clamping area 32.

[0035] In this embodiment, two return springs 14 are preferred. Two limiting holes are opened on the other side of the first clamping plate 3 and one side of the second clamping plate 4. The return springs 14 are placed in the limiting holes, and the two ends of the return springs 14 respectively abut against the first clamping plate 3 and the second clamping plate 4. The two springs are close to the two ends of the second clamping plate 4 respectively. The return springs 14 push the first clamping plate 3 to slide away from the second clamping plate 4 in the groove 11, so that the clamping area 32 becomes wider.

[0036] The first clamping plate 3 has a step, the lower part of which is parallel to the top of the wedge plate 2. The dust cover 15 covers the step of the first clamping plate 3, the top of the wedge plate 2, and the receiving groove 12. The dust cover 15 is fixedly connected to the limiting post 111. The dust cover 15 limits the first clamping plate 3 and the wedge plate 2 in the groove 11. The top of the first clamping plate 3, the top of the second clamping plate 4, the top of the dust cover 15, and the top of the base 1 are all located on the same horizontal plane, so that the top of the air clamp is a flat plane.

[0037] During work:

[0038] After placing the positioning pin 5 into the clamping area 32 and adjusting the position of the positioning pin 5 in the clamping area 32, the bottom surface of the positioning pin 5 touches the bottom surface of the groove 112, so that the positioning pin 5 is in a vertical state.

[0039] The output shaft of cylinder 13 applies a longitudinal thrust to wedge plate 2 through connecting block 131, pushing wedge plate 2 to slide a certain distance in slot 11, allowing wedge plate 2 to slide between one side of first clamping plate 3 and the inner wall of one side of slot 11. Wedge block 22 of wedge plate 2 slides on wedge block 22 of first clamping plate 3, pushing first clamping plate 3 to slide laterally in slot 11, compressing return spring 14, thereby reducing the width of clamping area 32, realizing clamping of positioning pin 5 by first clamping plate 3 and second clamping plate 4; In this embodiment, preferably, the clamped part of positioning pin 5 is larger than the part that protrudes from first clamping plate 3, which can greatly improve the friction of clamping positioning pin 5 by first clamping plate 3 and second clamping plate 4, and improve the longitudinal force of positioning pin 5;

[0040] The sliding paths of the wedge plate 2 and the first clamping plate 3 are orthogonally arranged, so that the force for clamping the positioning pin 5 is applied to the wedge plate 2 through the lateral constraint force of the inner wall on one side of the groove 11. By utilizing the friction between the wedge block 22 of the wedge plate 2 and the wedge block 22 of the first clamping plate 3, and the friction between the wedge plate 2 and the inner wall of the groove 11, the wedge plate 2 generates a self-locking effect. This allows the cylinder 13 to apply only a small longitudinal thrust to the wedge plate 2 to constrain the wedge block 22 in the current position, so that the pneumatic clamp can maintain a stable clamping force. This solves the problem that clamping the positioning pin requires a large reliance on the cylinder 13, and reduces the working pressure of the cylinder 13.

[0041] When the positioning pin 5 needs to be replaced, the output shaft of the cylinder 13 applies a longitudinal pulling force to the wedge plate 2 through the connecting block 131, which will pull the wedge plate 2 out a certain distance from the first clamping plate 3 and the slot 11. After the first clamping plate 3 loses the push of the wedge block 22 of the wedge plate 2, the return spring 14 pushes the first clamping plate 3 to slide and reset in a direction away from the second clamping plate 4, thereby expanding the width of the clamping area 32 and realizing the release of the positioning pin 5 from the first clamping plate 3 and the second clamping plate 4.

[0042] This invention provides a pneumatic clamp with stable clamping force. When a positioning pin is placed in the clamping area, the output shaft of the cylinder applies a longitudinal thrust to the wedge plate, causing the wedge plate to slide a certain distance within the groove. The wedge plate then slides between the first clamping plate and the inner wall of one side of the groove. The wedge block of the wedge plate slides on the wedge block of the first clamping plate, thereby pushing the first clamping plate to slide laterally within the groove, reducing the width of the clamping area and achieving the clamping of the positioning pin. Since the sliding path of the wedge plate is perpendicular to the sliding path of the first clamping plate, the force clamping the positioning pin is transmitted through the inner wall of one side of the groove. The wall applies a lateral constraint force to the wedge plate. Utilizing the friction between the wedge block of the wedge plate and the wedge block of the first clamping plate, as well as the friction between the wedge plate and the inner wall of the groove, the wedge plate generates a self-locking effect. This allows the cylinder to apply only a small longitudinal thrust to the wedge plate to constrain the wedge block to its current position, ensuring the pneumatic clamp maintains a stable clamping force while reducing the working pressure of the cylinder. Furthermore, the positioning pin can be moved longitudinally back and forth within the clamping area before being clamped to adjust its position and readjust the zero position of any replaced positioning pin.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A pneumatic clamp with stable clamping force, characterized in that, The device includes a base, on which a cylinder is fixedly connected. A slot is provided on the base, and a wedge plate slides in contact with the slot. The wedge plate abuts against the inner wall of one side of the slot. The output shaft of the cylinder is connected to the wedge plate. A first clamping plate slides in the slot. Both the wedge plate and the first clamping plate have wedge blocks extending from them. The wedge block of the wedge plate abuts against the wedge block of the first clamping plate. The sliding path of the wedge plate is perpendicular to the sliding path of the first clamping plate. A clamping area is formed between the first clamping plate and the inner wall of the other side of the slot.

2. The pneumatic clamp with stable clamping force as described in claim 1, characterized in that, Multiple limiting posts extend from the groove, and a sliding groove is provided on the first clamping plate, in which the limiting posts are placed and slidably contact each other.

3. The pneumatic clamp with stable clamping force as described in claim 2, characterized in that, A connecting block is fixedly connected to the output shaft of the cylinder. A protrusion extends from the connecting block. A slot is provided at one end of the wedge plate, and the protrusion is locked into the slot for fixation.

4. The pneumatic clamp with stable clamping force as described in claim 3, characterized in that, The base has a receiving groove that communicates with the slot. One end of the wedge plate passes through the receiving groove from the connection between the slot and the receiving groove, and the cylinder is located inside the receiving groove.

5. The pneumatic clamp with stable clamping force as described in claim 4, characterized in that, A second clamping plate is fixedly connected to the inner wall on the other side of the slot, and the clamping area is located between the first clamping plate and the second clamping plate.

6. The pneumatic clamp with stable clamping force as described in claim 5, characterized in that, It also includes a reset spring, the two ends of which respectively contact the first clamping plate and the second clamping plate.

7. The pneumatic clamp with stable clamping force as described in claim 6, characterized in that, The bottom of the slot is provided with a groove, which is close to the clamping area.

8. The pneumatic clamp with stable clamping force as described in claim 7, characterized in that, It also includes a dust cover plate, which covers the first clamping plate, the wedge plate and the receiving groove, and the dust cover plate is fixedly connected to the limiting post.

Images