Pneumatic clamping structure for clamping positioning pin

Abstract

The utility model discloses a pneumatic clamping structure for clamping a locating pin, which comprises a cylinder seat, a chuck, a first air injection device and a reset mechanism, a cavity is arranged in the cylinder seat, a first air inlet communicated with the cavity is arranged on the cylinder seat, a piston is connected in the cavity in a sliding mode, one end of the piston penetrates out of the cylinder seat, and the other end of the piston is connected with a second air injection device. A through hole is formed in the piston in a penetrating mode, a first conical surface is arranged on the inner wall of the through hole, a center hole is formed in the chuck, the chuck is arranged in the through hole, a second conical surface is arranged on the outer side of the chuck, the first conical surface abuts against the second conical surface, and the chuck is fixedly connected with the air cylinder seat. An air outlet of the first air injection device is communicated with the first air inlet, and the reset mechanism pushes the piston to slide and reset. According to the pneumatic clamp structure for clamping the positioning pin, the clamping head in the pneumatic clamp exerts clamping force towards the center to restrain the positioning pin, and looseness is avoided.

Description

Technical Field

[0001] This utility model relates to the field of clamping structures, and in particular to a pneumatic clamping structure for clamping positioning pins. Background Technology

[0002] In the precision machining of PCB boards, the drilling positioning accuracy directly affects the alignment between the positioning holes and the circuits, as well as the yield of finished products. In the existing technology, drilling worktables generally adopt a multi-positioning pin combination clamping scheme: by pre-setting an array of mounting holes on the worktable substrate, adjustable positioning pins are inserted to enclose and form a positioning space that fits the shape of the PCB board, and the position is fixed by the contact between the pin and the edge of the PCB.

[0003] However, such mechanical positioning mechanisms have significant drawbacks. The positioning pins and mounting holes rely on interference fits for fixation. Under long-term high-frequency insertion and removal and vibration impact, gaps are generated between the pin body and the hole wall due to mechanical wear, causing the positioning pins to gradually loosen or even deviate. This results in poor PCB board clamping stability and lower positioning accuracy, which restricts the mass production quality and cost controllability of high-density PCB boards under the trend of micro-hole and high precision. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic clamp structure for holding a positioning pin, which applies a clamping force towards the center through the clamp inside the pneumatic clamp to constrain the positioning pin and prevent it from loosening.

[0005] The technical solution adopted by the pneumatic clamp structure for clamping positioning pins disclosed in this utility model is as follows:

[0006] The device includes a cylinder seat, a chuck, a first air injection device, and a reset mechanism. The cylinder seat has a chamber and a first air inlet communicating with the chamber. A piston is slidably connected to the chamber, with one end of the piston extending out of the cylinder seat. A through hole is passed through the piston, and a first conical surface is provided on the inner wall of the through hole. The chuck has a central hole and is placed inside the through hole. A second conical surface is provided on the outer side of the chuck, and the first conical surface abuts against the second conical surface. The chuck is fixedly connected to the cylinder seat. The air outlet of the first air injection device communicates with the first air inlet. The reset mechanism pushes the piston to slide and reset.

[0007] As a preferred embodiment, the chamber extends through the cylinder seat to form an opening, and a cover plate is provided on the opening. A fixing member passes through the cover plate, and the fixing member is fixedly connected to the clamp.

[0008] As a preferred embodiment, a first sealing ring is fitted on the outer side of the piston, and the first sealing ring touches the inner wall of the chamber.

[0009] As a preferred embodiment, the first sealing ring divides the chamber into two cavities, and the first air inlet is connected to one of the cavities.

[0010] As a preferred embodiment, the reset mechanism includes a reset spring, which is sleeved on the outside of the clamp and located in another cavity, with its two ends contacting the cover plate and the piston, respectively.

[0011] As a preferred embodiment, the reset mechanism includes a reset spring, which is sleeved on the outside of the piston and located in another cavity, with the two ends of the reset spring respectively contacting the inner wall of the other cavity and the piston.

[0012] As a preferred embodiment, the cylinder seat is provided with a second air inlet, which is connected to another cavity. The return spring includes a second air injection device, and the outlet of the second air injection device is connected to the second air inlet.

[0013] As a preferred embodiment, one end of the chuck is provided with multiple through slots, which are arranged around the central hole, and the second conical surface is close to one end of the chuck.

[0014] The beneficial effects of the pneumatic clamp structure for holding positioning pins disclosed in this utility model are:

[0015] The cylinder seat is fixed on the worktable. The first air injection device injects air into the chamber through the first air inlet. The air pushes the piston to slide a certain distance in the chamber, so that the first cone surface moves away from the second cone surface. At this time, the center hole of the chuck opens, and then the positioning pin is put into the center hole.

[0016] After the positioning pin is placed, the operation of the first air injection device is turned off. The piston loses the air push, and the reset mechanism pushes the piston to slide back to its original position, so that the first conical surface touches the second conical surface. This causes the center hole of the chuck to retract towards the center and clamp the positioning pin, thus achieving the functions of positioning the center point and clamping the positioning pin. This solves the problem of the positioning pin becoming loose due to mechanical wear between the pin body and the hole wall after long-term use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a pneumatic clamp structure for holding positioning pins according to the present invention.

[0018] Figure 2 This is a schematic diagram of the component installation of a second embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0019] Figure 3 This is a cross-sectional view of a second embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0020] Figure 4This is a schematic diagram of a third embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0021] Figure 5 This is a schematic diagram of the component installation of a third embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0022] Figure 6 This is a cross-sectional view of a third embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0023] Figure 7 This is a schematic diagram of the fourth embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0024] Figure 8 This is a schematic diagram of the component installation of a fourth embodiment of the pneumatic clamp structure for holding positioning pins according to this utility model.

[0025] Figure 9 This is a cross-sectional view of embodiment four of the pneumatic clamp structure for clamping positioning pins according to this utility model. Detailed Implementation

[0026] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0027] Example 1, please refer to Figures 1-3 and Figure 6 , Figure 9 .

[0028] The present invention discloses a pneumatic clamp structure for clamping positioning pins, comprising a cylinder seat 1, a clamp 4, a first air injection device and a reset mechanism 5;

[0029] A flange is fixedly connected to one end of the cylinder seat 1, and the cylinder seat 1 is fixedly connected to the workbench through the flange; a chamber 13 is opened inside the cylinder seat 1, the chamber 13 extends out of the cylinder seat 1, and an opening is formed at the other end of the cylinder seat 1, and a cover plate 2 is provided on the opening, and a groove is provided on the cover plate 2.

[0030] Furthermore, a first air inlet 11 is provided on the cylinder seat 1, and the first air inlet 11 is connected to the chamber 13.

[0031] A piston 3 is slidably connected inside the chamber 13. One end of the piston 3 extends out from one end of the cylinder seat 1. A limiting ring 31 extends out from the outside of the piston 3. An annular groove is provided on the limiting ring 31. A first sealing ring is fitted on the outside of the piston 3. The first sealing ring is fitted in the annular groove and touches the inner wall of the chamber 13.

[0032] Furthermore, the first sealing ring divides the chamber 13 into two cavities 131, and the first air inlet 11 is connected to one of the cavities 131.

[0033] Furthermore, a through hole is provided on the piston 3, and a first conical surface is provided on the inner wall of the through hole, with the first conical surface near one end of the piston 3.

[0034] One end of the chuck 4 has a central hole 41, and the outer side of the chuck 4 has a second conical surface, which is close to one end of the chuck 4. One end of the chuck 4 has a plurality of through slots 42, which are arranged at intervals around the central hole 41. The through slots 42 are located at one end of the central hole 41, and the plurality of through slots 42 divide one end of the chuck 4 into a plurality of jaws. The second conical surface is on the outer side of the jaws.

[0035] Furthermore, the chuck 4 is placed in the through hole, and the other end of the chuck 4 touches the cover plate 2. The chuck 4 is fixedly connected to the cover plate 2 of the cylinder seat 1. The worktable has the same number of holes as the cylinder seat 1, and one end of the chuck 4 is close to the hole.

[0036] Furthermore, a fixing member 21 is inserted through the cover plate 2. The fixing member 21 is placed in the groove and is fixedly connected to one end of the chuck 4. The central hole 41 penetrates the chuck 4. Threads are opened on the inner wall of the central hole 41 and the outer side of the fixing member 21. The thread of the central hole 41 is close to the other end of the central hole 41. The thread of the fixing member 21 is connected to the thread of the chuck 4, so that the cylinder seat 1 can constrain the chuck 4 in the chamber 13 through the fixing member 21.

[0037] Furthermore, a third air inlet 211 is provided on the fixing member 21. The third air inlet 211 penetrates the fixing member 21, so that the third air inlet 211 is connected to the central hole 41, and a third air injection device is connected to the third air inlet 211.

[0038] Furthermore, a second sealing ring is fitted on the outer side of the chuck 4. The second sealing ring is close to the other end of the chuck 4 and touches the inner wall of the through hole. The second sealing ring is used to seal the gap between the chuck 4 and the through hole to prevent air in the chamber 13 from leaking out from the gap between the chuck 4 and the through hole.

[0039] The outlet of the first air injection device is connected to the first air inlet 11. The first air injection device pushes the piston 3 to slide in the air chamber, so that the first cone surface moves away from the second cone surface.

[0040] The reset mechanism 5 pushes the piston 3 to slide and reset in the air chamber, so that the first cone surface touches the second cone surface.

[0041] During work:

[0042] The cylinder seat 1 is fixedly connected to the preset position on the workbench. Air is injected into one of the chambers 131 through the first air inlet 11 by the first air injection device. The air pushes the piston 3 to slide a certain distance in the chamber 13, thereby moving the first conical surface away from the second conical surface. The multiple grippers unfold after losing the push from the first conical surface. When placing the positioning pin, the worker brings the positioning pin close to the center hole 41. The third air injection device injects airflow into the center hole 41 through the third air inlet 211 to blow away the dust and debris attached to the center hole 41 and the positioning pin, ensuring the uniform and reliable clamping and verticality of the positioning pin. After cleaning, the positioning pin is then placed into the center hole 41, and the positioning pin passes through the hole.

[0043] After the positioning pin is placed, the operation of the first air injection device is turned off, so that the piston 3 loses the air driving force. Then, the piston 3 is pushed to slide back to its original position by the reset mechanism 5, so that the first conical surface touches the second conical surface, thereby allowing multiple jaws to retract synchronously to clamp the positioning pin. At this time, the center hole 41 of the chuck 4 retracts towards the center to clamp the positioning pin, thus realizing the functions of positioning the center point and clamping the positioning pin.

[0044] Example 2, please refer to Figures 1-3 .

[0045] Based on the original embodiment 1, the reset mechanism 5 includes a reset spring 51, which is sleeved on the outside of the chuck 4, and the chuck 4 is located in another cavity 131; the two ends of the reset spring 51 respectively abut against the cover plate 2 and the other end of the piston 3, and the reset spring 51 pushes the piston 3 to slide in the cavity 13, so that the first conical surface abuts against the second conical surface; the first air inlet 11 is close to one end of the cylinder seat 1;

[0046] Furthermore, the cross-section of the first conical surface is trumpet-shaped, and the wide end of the trumpet-shaped first conical surface is close to one end of the piston 3, so that the chuck 4 can limit the sliding distance of the piston 3 through the second conical surface, thus preventing the piston 3 from being pushed out of the chamber 13 by the reset spring 51.

[0047] A third sealing ring is fitted on the outer side of the piston 3. The third sealing ring is close to one end of the piston 3 and is located between the cylinder seat 1 and the piston 3. The third sealing ring is used to seal the gap between the cylinder seat 1 and the piston 3 to prevent air in the chamber 13 from leaking from the gap between the cylinder seat 1 and the piston 3.

[0048] During work:

[0049] Air is injected into one of the chambers 131 through the first air inlet 11 via the first air injection device. This causes the air to push the piston 3 to slide a certain distance within the chamber 13, thereby moving the first conical surface away from the second conical surface. At the same time, the return spring 51 is compressed. After losing the push from the first conical surface, the multiple grippers unfold. At this time, the central hole 41 of the chuck 4 opens, and the positioning pin is then inserted into the central hole 41. There is a gap between the cylinder seat 1 and the cover plate 2. When the piston 3 compresses the return spring 51, the air in the other chamber 131 can be discharged from the gap between the cylinder seat 1 and the cover plate 2, thus avoiding restricting the sliding of the piston 3.

[0050] After the positioning pin is placed, the operation of the first air injection device is turned off, so that the piston 3 loses the air thrust. Then, the return spring 51 pushes the piston 3 to slide back to its original position, so that the first conical surface touches the second conical surface. This allows multiple jaws to retract synchronously to clamp the positioning pin. At this time, the center hole 41 of the chuck 4 retracts towards the center to clamp the positioning pin, thus achieving the functions of positioning the center point and clamping the positioning pin. Meanwhile, the air from the outside enters another cavity 131 from the gap between the cylinder seat 1 and the cover plate 2, thus avoiding restricting the sliding of the piston 3.

[0051] Example 3, please refer to Figures 4-6 .

[0052] Based on the original embodiment 1, the reset mechanism 5 includes a reset spring 51, which is sleeved on the outside of the piston 3, and the clamp 4 is located in another cavity 131; the two ends of the reset spring 51 respectively abut against the inner wall of the other cavity 131 and the limiting ring 31 of the piston 3, and the reset spring 51 pushes the piston 3 to slide in the cavity 13, so that the first conical surface abuts against the second conical surface; the first air inlet 11 is close to the cover plate 2;

[0053] Furthermore, the cross-section of the first conical surface is trumpet-shaped, and the narrow end of the trumpet-shaped first conical surface is close to one end of the piston 3, so that the chuck 4 can limit the sliding distance of the piston 3 through the second conical surface, thereby preventing the piston 3 from blocking the first air inlet 11.

[0054] A fourth sealing ring is fitted on the outer side of the cover plate 2. The fourth sealing ring is located between the cylinder seat 1 and the cover plate 2. The fourth sealing ring is used to seal the gap between the cylinder seat 1 and the cover plate 2 to prevent air in the chamber 13 from leaking out from the gap between the cylinder seat 1 and the cover plate 2.

[0055] During work:

[0056] Air is injected into one of the chambers 131 through the first air inlet 11 via the first air injection device. This causes the air to push the piston 3 to slide a certain distance within the chamber 13, thereby moving the first conical surface away from the second conical surface. At the same time, the return spring 51 is compressed. After losing the push from the first conical surface, the multiple grippers unfold. At this time, the central hole 41 of the chuck 4 opens, and the positioning pin is then inserted into the central hole 41. There is a gap between the cylinder seat 1 and the piston 3. When the piston 3 compresses the return spring 51, the air in the other chamber 131 can be discharged from the gap between the cylinder seat 1 and the piston 3, thus avoiding restricting the sliding of the piston 3.

[0057] After the positioning pin is placed, the operation of the first air injection device is turned off, so that the piston 3 loses the air thrust. Then, the return spring 51 pushes the piston 3 to slide back to its original position, so that the first conical surface touches the second conical surface. This causes the multiple jaws to retract synchronously to clamp the positioning pin. At this time, the center hole 41 of the chuck 4 retracts towards the center to clamp the positioning pin, thus achieving the functions of positioning the center point and clamping the positioning pin. At the same time, the air from the outside enters another cavity 131 from the gap between the cylinder seat 1 and the piston 3, thus avoiding restricting the sliding of the piston 3.

[0058] Example 4, please refer to Figures 7-9 .

[0059] Based on the original embodiment 1, a second air inlet 12 is provided on the cylinder seat 1, and the second air inlet 12 is connected to another cavity 131; the return spring 51 includes a second air injection device, and the air outlet of the second air injection device is connected to the second air inlet 12; the first air inlet 11 is close to one end of the cylinder seat 1, and the second air inlet 12 is close to the cover plate 2.

[0060] Furthermore, the cross-section of the first conical surface is trumpet-shaped, and the wide end of the trumpet-shaped first conical surface is close to one end of the piston 3, so that the chuck 4 can limit the sliding distance of the piston 3 through the second conical surface, thus preventing the piston 3 from being pushed out of the chamber 13 by the reset spring 51.

[0061] A third sealing ring is fitted on the outer side of the piston 3. The third sealing ring is close to one end of the piston 3 and is located between the cylinder seat 1 and the piston 3. The third sealing ring is used to seal the gap between the cylinder seat 1 and the piston 3 to prevent air in the chamber 13 from leaking from the gap between the cylinder seat 1 and the piston 3.

[0062] Furthermore, a fourth sealing ring is fitted on the outer side of the cover plate 2. The fourth sealing ring is located between the cylinder seat 1 and the cover plate 2. The fourth sealing ring is used to seal the gap between the cylinder seat 1 and the cover plate 2 to prevent air in the chamber 13 from leaking from the gap between the cylinder seat 1 and the cover plate 2.

[0063] During work:

[0064] By shutting off the second air injection device, the first air injection device injects air into one of the chambers 131 through the first air inlet 11. This causes the air to push the piston 3 to slide a certain distance within the chamber 13, thereby moving the first conical surface away from the second conical surface. At the same time, the return spring 51 is compressed, and the multiple grippers unfold after losing the push from the first conical surface. At this time, the central hole 41 of the chuck 4 opens, and the positioning pin is then inserted into the central hole 41. Meanwhile, the air in the other chamber 131 can flow back to the second air injection device, thus preventing the piston 3 from being restricted from sliding.

[0065] After the positioning pin is placed, the operation of the first air injection device is turned off, so that the piston 3 loses the air thrust. The second air injection device injects air into another cavity 131 through the second air inlet 12, so that the air pushes the piston 3 to slide a certain distance in the cavity 13, so that the first conical surface touches the second conical surface, thereby causing multiple jaws to retract synchronously to clamp the positioning pin. At this time, the center hole 41 of the chuck 4 retracts towards the center to clamp the positioning pin, realizing the functions of positioning the center point and clamping the positioning pin. At the same time, the air in one of the cavities 131 can flow back to the first air injection device to avoid restricting the sliding of the piston 3.

[0066] This utility model provides a pneumatic clamp structure for clamping a positioning pin. The cylinder seat is fixed on the worktable. The first air injection device injects air into the chamber through the first air inlet. The air pushes the piston to slide a certain distance in the chamber, so that the first conical surface moves away from the second conical surface. At this time, the center hole of the clamp opens, and then the positioning pin is put into the center hole.

[0067] After the positioning pin is placed, the operation of the first air injection device is turned off. The piston loses the air push, and the reset mechanism pushes the piston to slide back to its original position, so that the first conical surface touches the second conical surface. This causes the center hole of the chuck to retract towards the center and clamp the positioning pin, thus achieving the functions of positioning the center point and clamping the positioning pin. This solves the problem of the positioning pin becoming loose due to mechanical wear between the pin body and the hole wall after long-term use.

[0068] 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 structure for holding a positioning pin, characterized in that, include A cylinder seat, wherein a chamber is provided inside the cylinder seat, and a first air inlet communicating with the chamber is provided on the cylinder seat. A piston is slidably connected in the chamber, one end of the piston protrudes from the cylinder seat, and a through hole is provided on the piston. A first conical surface is provided on the inner wall of the through hole. The chuck has a central hole and is placed inside the through hole. The outer side of the chuck has a second conical surface, and the first conical surface touches the second conical surface. The chuck is fixedly connected to the cylinder seat. A first air injection device, wherein the air outlet of the first air injection device is connected to a first air inlet; A reset mechanism that pushes the piston to slide and reset.

2. The pneumatic clamp structure for clamping a positioning pin as described in claim 1, characterized in that, The chamber extends through the cylinder seat to form an opening, and a cover plate is provided on the opening. A fixing member passes through the cover plate and is fixedly connected to the clamp.

3. The pneumatic clamp structure for clamping a positioning pin as described in claim 2, characterized in that, The piston is fitted with a first sealing ring on its outer side, and the first sealing ring touches the inner wall of the chamber.

4. The pneumatic clamp structure for clamping a positioning pin as described in claim 3, characterized in that, The first sealing ring divides the chamber into two cavities, and the first air inlet is connected to one of the cavities.

5. The pneumatic clamp structure for clamping a positioning pin as described in claim 4, characterized in that, The reset mechanism includes a reset spring, which is sleeved on the outside of the clamp and located in another cavity. The two ends of the reset spring respectively contact the cover plate and the piston.

6. The pneumatic clamp structure for clamping a positioning pin as described in claim 4, characterized in that, The reset mechanism includes a reset spring, which is sleeved on the outside of the piston and located in another cavity. The two ends of the reset spring respectively abut against the inner wall of the other cavity and the piston.

7. The pneumatic clamp structure for clamping a positioning pin as described in claim 4, characterized in that, The cylinder seat has a second air inlet, which is connected to another cavity. The return spring includes a second air injection device, and the outlet of the second air injection device is connected to the second air inlet.

8. A pneumatic clamp structure for clamping a positioning pin as described in any one of claims 5-7, characterized in that, One end of the chuck has multiple through slots arranged around the central hole, and the second conical surface is close to one end of the chuck.

9. A pneumatic clamp structure for holding a positioning pin as described in claim 8, characterized in that, The central hole penetrates the clamp, and the fixing member has a third air inlet. The third air inlet is connected to the central hole, and a third air injection device is connected to the third air inlet.

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