Pneumatic positioning clamp

Abstract

The utility model relates to the field of machining, in particular to a pneumatic positioning clamp which comprises a base, a supporting plate and a clamping device installed on the base, a positioning blind rivet matched with the clamping device is arranged at the lower end of the supporting plate, the clamping device is provided with a positioning hole matched with the positioning blind rivet, and the positioning hole is communicated with the positioning blind rivet. The base is provided with a first air inlet hole connected with the positioning hole. Through the positioning blind rivet and the positioning hole which are tightly matched, the positioning precision of clamping is ensured. And during disassembly, external high-pressure gas passes through the first air inlet hole and the positioning hole, and the positioning blind rivet which is tightly matched with the first air inlet hole is pushed out of the positioning hole. Therefore, the dismounting difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the field of mechanical processing, in particular to a pneumatic positioning clamp. Background Art

[0002] A fixture is a device used to fix the object to be processed in the mechanical manufacturing process so that it occupies the correct position for construction or inspection. It is also called a fixture. In a broad sense, any device used to quickly, conveniently and safely install the workpiece in any process of the process can be called a fixture. A fixture usually consists of a positioning element (to determine the correct position of the workpiece in the fixture), a clamping device, a tool guide element (to determine the relative position of the tool and the workpiece or to guide the direction of the tool), a dividing device (to enable the workpiece to complete the processing of several stations in one installation, and there are two types of rotary dividing devices and linear moving dividing devices), connecting elements, and a clamp body (fixture base).

[0003] In the production process of existing clamps, due to the need to frequently install and disassemble parts, dust, iron filings, etc. inevitably enter the positioning holes, causing wear on the clamps and shortening the service life of the clamps. At the same time, in order to ensure high positioning accuracy of the clamps, the positioning rivets and the positioning holes need to be matched with high precision, which increases the difficulty of disassembly and reduces production efficiency. Therefore, the utility model provides a dustproof and easy-to-disassemble positioning clamp. Summary of the invention

[0004] The utility model provides a pneumatic positioning clamp to solve the problems mentioned in the above background technology.

[0005] The purpose of the utility model is achieved by the following methods:

[0006] A pneumatic positioning clamp comprises a base, a support plate and a clamping device installed on the base, the lower end of the support plate is provided with a positioning pin cooperating with the clamping device, the clamping device is provided with a positioning hole cooperating with the positioning pin, and the base is provided with a first air inlet hole connected to the positioning hole.

[0007] Furthermore, the clamping devices are provided with two or more.

[0008] Further, the base is provided with a mounting groove, the clamping device includes a pneumatic piston and a plurality of steel balls for fixing the positioning rivets, the pneumatic piston is movably arranged in the mounting groove, a positioning tray for cooperating with the pneumatic piston is installed at the upper end of the mounting groove, the positioning tray and the middle of the pneumatic piston are formed with the positioning hole, the lower end of the positioning tray is provided with a mounting hole for accommodating a plurality of steel balls, and the inner side of the pneumatic piston is provided with a accommodating groove aligned with the mounting hole;

[0009] When the pneumatic piston moves to the upper end of the mounting groove, one side of the steel ball protrudes from the positioning hole;

[0010] When the pneumatic piston moves to the lower end of the mounting groove, the steel ball moves into the containing groove.

[0011] Furthermore, the positioning rivet is provided with a clamping groove for cooperating with the steel ball.

[0012] Furthermore, a guide ring is installed on the outer side of the pneumatic piston.

[0013] Furthermore, the pneumatic piston is provided with a first cavity and a second cavity at the upper and lower ends respectively, the first cavity is connected to the first air inlet hole, the other end of the first cavity is connected to the positioning hole, and one end of the second cavity is connected to the second air inlet hole.

[0014] Furthermore, there is a gap between the lower end of the positioning tray and the base, and the first cavity is connected to the first air inlet through the gap.

[0015] Furthermore, an air guide groove is provided at the lower end of the positioning tray, and the first cavity is connected to the first air inlet hole through the air guide groove.

[0016] Furthermore, an air inlet groove is provided on the base, and the first cavity is connected to the first air inlet hole through the air inlet groove.

[0017] Furthermore, handles are respectively provided on both sides of the support plate.

[0018] The utility model ensures the positioning accuracy of clamping through the tightly matched positioning pins and positioning holes. When disassembling, the external high-pressure gas passes through the first air inlet hole and the positioning hole to push the tightly matched positioning pins out of the positioning hole, thereby reducing the difficulty of disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a pneumatic positioning clamp in Example 1;

[0020] Figure 2 It is an exploded schematic diagram of a pneumatic positioning clamp in the first embodiment;

[0021] Figure 3 It is a first cross-sectional view of a pneumatic positioning clamp in the first embodiment;

[0022] Figure 4 A second cross-sectional view of a pneumatic positioning clamp in Embodiment 1;

[0023] Figure 5 It is a first partial cross-sectional view of a pneumatic positioning clamp in the first embodiment;

[0024] Figure 6 A second partial cross-sectional view of a pneumatic positioning clamp in the first embodiment;

[0025] Figure 7 This is a schematic diagram of gas flow during disassembly in Example 1;

[0026] Figure 8 It is a partial enlarged view of the base in Example 1;

[0027] Fig. 9 A partial cross-sectional view of a pneumatic positioning clamp in Embodiment 2;

[0028] Fig.10 It is a structural schematic diagram of the positioning tray in the second embodiment;

[0029] Fig.11 It is a partial enlarged view of the base in the second embodiment;

[0030] The reference numerals in the figure are: 1-base, 2-support plate, 3-positioning rivet, 4-positioning hole, 5-first air inlet hole, 6-mounting groove, 7-pneumatic piston, 8-steel ball, 9-positioning tray, 10-mounting hole, 11-accommodating groove, 12-guide ring, 13-first cavity, 14-second cavity, 15-second air inlet hole, 16-gap, 17-handle, 18-clamping groove, 19-air guide groove, 20-air inlet groove. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1:

[0033] In this embodiment, refer to Figure 1-Figure 8 A gas protection positioning clamp is specifically implemented, including a base 1, a support plate 2 and a clamping device installed on the base 1, the lower end of the support plate 2 is provided with a positioning pin 3 that cooperates with the clamping device, the clamping device is provided with a positioning hole 4 that cooperates with the positioning pin 3, and the base 1 is provided with a first air inlet hole 5 connected to the positioning hole 4.

[0034] Furthermore, a part of the distance between the positioning rivet 3 and the positioning hole 4 is closely matched, and the positioning accuracy of the positioning rivet 3 and the positioning hole 4 is 0.003mm-0.005mm. The external air reaches the positioning hole 4 through the first air inlet 5, and air pressure is generated at the lower end of the positioning rivet 3. When the air pressure reaches a certain value, the pressure presses the positioning rivet 3 upward out of the positioning hole 4, so that the positioning rivet 3 can be easily taken out. After the positioning rivet 3 and the support plate 2 are taken out, the first air inlet 5 continues to work, so that the positioning hole 4 generates a micro air film to prevent dust and iron filings from entering the positioning hole 4.

[0035] Furthermore, two or more clamping devices are provided, so that the support plate 2 is more stable and the positioning accuracy is improved, thereby ensuring the accuracy during assembly and the stability during processing.

[0036] Further, a mounting groove 6 is provided on the base 1, and the clamping device includes a pneumatic piston 7 and a plurality of steel balls 8 for fixing the positioning rivets 3. The pneumatic piston 7 can be lifted and lowered in the mounting groove 6. A positioning tray 9 for cooperating with the pneumatic piston 7 is installed at the upper end of the mounting groove 6. A positioning hole 4 is formed in the middle of the positioning tray 9 and the pneumatic piston 7. A mounting hole 10 for accommodating a plurality of steel balls 8 is provided at the lower end of the positioning tray 9. A receiving groove 11 aligned with the mounting hole 10 is provided on the inner side of the pneumatic piston 7.

[0037] When the pneumatic piston 7 moves to the upper end of the mounting groove 6, one side of the steel ball 8 protrudes from the positioning hole 4, playing the role of clamping the positioning rivet 3;

[0038] When the pneumatic piston 7 moves to the lower end of the installation groove 6 , the steel ball 8 moves into the receiving groove 11 , thereby loosening the positioning rivet 3 .

[0039] Furthermore, the positioning rivet 3 is provided with a clamping groove 18 for cooperating with the steel ball 8. The clamping groove 18 is designed in a triangular shape, so that when the pneumatic piston 7 moves upward, the clamping groove 18 can fit the steel ball 8 to firmly fix the positioning rivet 3. When the pneumatic piston 7 moves downward, the steel ball 8 can be pushed back into the receiving groove 11 through the inclined surface to release the positioning rivet 3.

[0040] Furthermore, a guide ring 12 is installed on the outer side of the pneumatic piston 7, so that the pneumatic piston 7 can slide more smoothly and stably in the mounting groove 6. The guide ring 12 is made of wear-resistant and corrosion-resistant materials to ensure its reliability and stability in long-term use.

[0041] Furthermore, the upper and lower ends of the pneumatic piston 7 are respectively provided with a first cavity 13 and a second cavity 14, the first cavity 13 is connected to the first air inlet 5, the other end of the first cavity 13 is connected to the positioning hole 4, and one end of the second cavity 14 is connected to the second air inlet 15. By injecting gas into the first cavity 13 and the second cavity 14 respectively, the pneumatic piston 7 can move up and down along the mounting groove 6, and cooperate with the steel ball 8 to achieve the effect of clamping or loosening the positioning rivet 3.

[0042] Furthermore, there is a gap 16 between the lower end of the positioning tray 9 and the base 1, and the first cavity 13 is connected to the first air inlet 5 through the gap 16. The gas can smoothly enter the first cavity 13 through the gap 16, so that the pneumatic piston 7 can quickly respond to the change of the gas, thereby improving the working efficiency.

[0043] Furthermore, handles 17 are respectively provided on both sides of the support plate 2, and the handles 17 facilitate the user to carry and move the support plate 22, so as to improve the convenience of installation and disassembly.

[0044] The beneficial effects of the utility model are as follows: by connecting the positioning hole 4 with the first air inlet hole 5, during the disassembly process, gas is injected into the first air inlet hole 5 to generate air pressure at the lower end of the positioning rivet 3. When the air pressure reaches a certain value, the pressure can press the positioning rivet 3 upward out of the positioning hole 4, making the disassembly of the positioning rivet 3 more convenient and quick. At the same time, continuing to inject gas after disassembling the positioning rivet 3 can form a micro-air film to protect the positioning hole 4 from falling into dust or iron filings, which will affect the positioning accuracy and the processing quality. This improves the convenience and practicality of positioning clamping.

[0045] Embodiment 2:

[0046] like Figure 9-11 As shown, the difference between this embodiment and the first embodiment is that the lower end of the positioning tray 9 is provided with an air guide groove 19 connected to the first air inlet hole 5, the base 1 is provided with an air inlet groove 20 connected to the air guide groove 19, and the air inlet groove 20 is connected to the first cavity 13. The design of the air guide groove 19 and the air inlet groove 20 makes the gas entering the first cavity 13 more evenly distributed, ensuring the uniform force of the pneumatic piston 7 and further improving the stability.

[0047] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A pneumatic positioning clamp, comprising a base (1), a support plate (2) and a clamping device mounted on the base (1), wherein a positioning rivet (3) cooperating with the clamping device is provided at the lower end of the support plate (2), characterized in that: The clamping device is provided with a positioning hole (4) that cooperates with the positioning rivet (3), and the base (1) is provided with a first air inlet hole (5) connected to the positioning hole (4).

2. The pneumatic positioning clamp according to claim 1, characterized in that: The clamping devices are provided with two or more.

3. A pneumatic positioning clamp according to claim 1 or 2, characterized in that: The base (1) is provided with a mounting groove (6), the clamping device comprises a pneumatic piston (7) and a plurality of steel balls (8) for fixing the positioning rivet (3), the pneumatic piston (7) is arranged in the mounting groove (6) in a liftable manner, a positioning tray (9) for cooperating with the pneumatic piston (7) is installed at the upper end of the mounting groove (6), the positioning hole (4) is formed in the middle of the positioning tray (9) and the pneumatic piston (7), a mounting hole (10) for accommodating the plurality of steel balls (8) is arranged at the lower end of the positioning tray (9), and an accommodating groove (11) aligned with the mounting hole (10) is arranged on the inner side of the pneumatic piston (7); when the pneumatic piston (7) moves to the upper end of the mounting groove (6), one side of the steel ball (8) protrudes from the positioning hole (4); when the pneumatic piston (7) moves to the lower end of the mounting groove (6), the steel ball (8) moves into the accommodating groove (11).

4. The pneumatic positioning clamp according to claim 3, characterized in that: The positioning rivet (3) is provided with a clamping groove (18) for cooperating with the steel ball (8).

5. The pneumatic positioning clamp according to claim 3, characterized in that: A guide ring (12) is installed on the outer side of the pneumatic piston (7).

6. The pneumatic positioning clamp according to claim 3, characterized in that: The pneumatic piston (7) is provided with a first cavity (13) and a second cavity (14) at the upper and lower ends respectively; the first cavity (13) is connected to the first air inlet hole (5); the other end of the first cavity (13) is connected to the positioning hole (4); and one end of the second cavity (14) is connected to the second air inlet hole (15).

7. The pneumatic positioning clamp according to claim 6, characterized in that: There is a gap (16) between the lower end of the positioning tray (9) and the base (1), and the first cavity (13) is connected to the first air inlet (5) via the gap (16).

8. The pneumatic positioning clamp according to claim 6, characterized in that: An air guide groove (19) is provided at the lower end of the positioning tray (9), and the first cavity (13) is connected to the first air inlet (5) via the air guide groove (19).

9. The pneumatic positioning clamp according to claim 6, characterized in that: An air inlet groove (20) is provided on the base (1), and the first cavity (13) is connected to the first air inlet hole (5) via the air inlet groove (20).

10. A pneumatic positioning clamp according to any one of claims 4 to 9, characterized in that: Handles (17) are respectively provided on both sides of the support plate (2).

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