Pneumatic clamp

Abstract

The utility model relates to a pneumatic clamp, which comprises a clamp seat component, a clamping part and a clamping part, the clamp seat component comprises a clamp connecting base and a lubricating seat which are coaxially arranged, and a movable cavity is enclosed between the clamp connecting base and the lubricating seat which are adjacent to each other; the driving part is movably arranged on the inner side of the movable cavity; the driving part comprises a driving push rod which is coaxially arranged with the lubricating seat; the driving push rod is sleeved with a lubricating assembly connected with the lubricating base. One end of the deformation jig part is fixedly arranged on the clamp connecting base, and the other end of the deformation jig part can extend out of the lubricating base in a radial deformation mode; the deformation jig part comprises a hollow deformation shaft; and one end surface of the deformation shaft is connected with an adjusting seat. The clamp is suitable for machining various parts needing high-precision positioning and stable clamping, the machining precision and the production efficiency can be effectively improved, and the product quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology in the machining field, and in particular to a pneumatic clamp. Background Technology

[0002] In machining processes, the performance of fixtures directly affects the machining accuracy and production efficiency of workpieces. Traditional fixtures often have some shortcomings, such as uneven clamping force, inaccurate positioning, and accelerated wear due to a lack of effective lubrication mechanisms. For workpieces with special shapes or high precision requirements, traditional fixtures are difficult to meet their clamping needs. For example, when machining workpieces with thin-walled structures or high-precision internal holes, ordinary fixtures may cause workpiece deformation due to excessive clamping force, or affect machining accuracy due to their inability to accurately adapt to the workpiece shape. In addition, during long-term use, traditional fixtures suffer from significant frictional wear between components due to the lack of good lubrication and maintenance mechanisms, which not only reduces the service life of the fixture but may also affect the stability and reliability of clamping.

[0003] In view of this, the development of a new type of pneumatic clamp can effectively solve the above problems and has important practical significance. Summary of the Invention

[0004] The purpose of this utility model is to provide a pneumatic clamp that utilizes pneumatic drive to achieve precise clamping and has good lubrication and radial deformation functions. It is suitable for processing various parts that require high-precision positioning and stable clamping, such as shaft parts and pipe fittings. It can effectively improve processing accuracy and production efficiency, and ensure the stability of product quality, thereby solving the above-mentioned technical problems.

[0005] To achieve the above technical solution, the technical solution of this utility model is as follows: A pneumatic clamp mainly consists of a clamp base component, a drive component, and a deformation fixture component. The clamp base component, as the basic structure of the entire clamp, includes a clamp connecting base and a lubrication seat arranged coaxially, forming a movable chamber between them to provide space for the movement of the drive component. The drive component is movably disposed inside the movable chamber. Its core component, a drive push rod, is coaxially arranged with the lubrication seat, and a lubrication assembly connected to the lubrication seat is sleeved on the drive push rod. This assembly can effectively lubricate the relevant components during the drive process. One end of the deformation fixture component is fixed to the clamp connecting base, and the other end can deform radially and extend out of the lubrication seat. It mainly consists of a hollow deformation shaft and an adjusting seat disposed at one end of the deformation shaft. The drive component enables precise clamping of the workpiece.

[0006] Furthermore, the fixture connecting base and the lubrication seat are coaxially arranged, with the bottom of the lubrication seat inserted into the fixture connecting base and sealed by a sealing ring. This sealed connection not only ensures the sealing of the moving chamber, preventing dust and impurities from entering and affecting the normal operation of the drive components, but also ensures the effective storage and circulation of grease within the lubrication seat. One end of the fixture connecting base has a recessed negative pressure groove. Rubber rings corresponding to the periphery of the negative pressure groove generate a certain negative pressure adsorption effect during fixture operation, helping to further stabilize the workpiece position. The centrally located through-hole is convex in shape and has a locking thread, used for connection and fixation with other equipment or components. The lubrication seat has a moving chamber with an inner mirror surface. The mirror treatment reduces friction during the movement of the drive components, improving the smoothness of movement. The through-hole in the moving chamber and the grease injection groove connected to it provide a grease injection channel and storage space for the lubrication assembly. The second sealing ring grooves on both sides of the grease injection groove are used to install sealing rings, enhancing the sealing performance of the grease injection groove.

[0007] Furthermore, the drive push rod is a key component of the drive assembly. A third sealing ring on its periphery ensures a tight seal during movement within the moving chamber, preventing gas leakage from affecting the drive performance. The deformation fixture insertion hole on the drive push rod is used to install deformation fixture components. The concave frustum-shaped design at one end of the insertion hole mates with the corresponding structure of the deformation fixture component, achieving precise positioning and connection. The coaxially positioned positioning shoulder matches the locking hole of the clamping base, ensuring the accuracy of the drive push rod's position during movement. The copper seat slip ring of the lubrication assembly is in contact with the lubrication seat. The outer fixing seat is used to fix the position of the copper seat slip ring, and the pads on both sides provide cushioning and support. A removable pressure plate on the top of the fixing seat facilitates maintenance and repair of the lubrication assembly. The flow channel on the copper seat slip ring, communicating with the grease injection groove, allows the grease to form an effective lubricating film between the copper seat slip ring and the drive push rod, reducing frictional loss.

[0008] Furthermore, the deformation shaft has a hollow structure, with a concave deformation hole at one end along the axis ending in an arc surface. The width of the deformation hole is much smaller than the radius of the arc surface. This design allows the deformation shaft to generate precise radial deformation when subjected to external forces. The outer deformation extrusion section is also arc-shaped, allowing for better contact with the workpiece surface during clamping and providing uniform clamping force. An adjustment seat is located at one end of the deformation shaft, which can be used for fine-tuning according to the specific shape and size of the workpiece, further improving clamping accuracy and adaptability.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1) The lubrication seat is inserted into the fixture connecting base and connected by a sealing ring. The advantages of this design are: First, the excellent sealing performance effectively prevents external dust, impurities, and other foreign objects from entering the moving chamber. In a machining environment, if dust and impurities enter the moving chamber, they may adhere to the surface of the drive components, increasing frictional resistance between components, affecting the smooth movement of the drive components, and thus reducing the overall performance of the fixture. The sealing ring prevents this from happening, ensuring that the drive components operate in a clean environment and improving the reliability and stability of the fixture. Second, the sealed moving chamber provides a relatively stable space for the movement of the drive components, helping to accurately control the movement trajectory and force of the drive components, thereby achieving precise clamping of the workpiece.

[0011] 2) The lubrication seat has an inner mirror-finished movable chamber. Inside the cylindrical hole of the movable chamber is a grease injection groove communicating with the outside, and corresponding second sealing ring grooves on both sides of the grease injection groove. Its advantages are as follows: The mirror-finished movable chamber reduces friction on the drive components during movement, allowing the drive push rod to move more smoothly. The grease injection groove facilitates grease injection; during fixture operation, grease can be periodically replenished to ensure continuous lubrication. The second sealing ring groove is used to install sealing rings, further enhancing the sealing performance of the grease injection groove and preventing grease leakage. This not only ensures that the grease can effectively form a lubricating film between the drive components and the lubrication seat, reducing wear and extending component lifespan, but also avoids environmental pollution and fixture performance degradation that may result from grease leakage.

[0012] 3) One end of the fixture connecting base has a recessed negative pressure groove, and a rubber ring is provided around the corresponding negative pressure groove. The advantage is that when the fixture is working, the negative pressure groove and the rubber ring can generate a certain negative pressure adsorption effect. When clamping a workpiece, this negative pressure adsorption can help fix the workpiece's position, making the workpiece more stable during clamping and reducing clamping errors caused by workpiece shaking or displacement. Especially for workpieces with relatively smooth surfaces or irregular shapes, negative pressure adsorption can provide additional fixing force, improving clamping reliability. In addition, the through-hole in the center of the fixture connecting base, shaped like a convex character, has a locking thread, facilitating connection and fixation with other equipment or components, enhancing the overall installation flexibility and stability of the fixture, and enabling it to better adapt to different processing equipment and working scenarios.

[0013] 4) A third sealing ring is provided around the drive push rod. The advantage of this design is that it effectively prevents gas leakage when the drive push rod moves within the movable chamber. Gas leakage would cause unstable air pressure within the movable chamber, affecting the magnitude of the drive push rod's thrust and its movement speed, thus reducing the control accuracy of the workpiece clamping force. Good sealing performance ensures stable air pressure acting on the drive push rod, allowing it to move precisely as expected, guaranteeing the stability and reliability of the clamping process. One end of the deformation fixture insertion hole on the drive push rod is a concave frustum shape, and it is coaxially equipped with a positioning shoulder that matches the locking hole of the fixture connection base. The advantage of this structure is that the concave frustum design, combined with the corresponding structure of the deformation fixture component, allows for precise installation and positioning of the deformation fixture component, ensuring that the deformation fixture component accurately acts on the workpiece during clamping. The fit between the positioning shoulder and the locking hole ensures the axial positional accuracy of the drive push rod, preventing it from shifting or wobbling during movement, further improving clamping accuracy.

[0014] 5) The lubrication assembly includes a copper slip ring that contacts the lubrication seat. The outer side of the copper slip ring has an annular fixing seat, and pads on both sides. A pressure plate can be detachably installed on the top of the fixing seat. The copper slip ring also has a flow channel communicating with the grease injection groove. Its advantages are as follows: The copper slip ring's contact with the lubrication seat allows for good sliding contact between the drive push rod and the lubrication seat, reducing friction. The fixing seat and pads provide stable support and fixation for the copper slip ring, ensuring it will not shift or deform during operation. The detachable pressure plate facilitates maintenance and repair of the lubrication assembly. For example, when replacing the copper slip ring or cleaning the flow channel, the pressure plate can be quickly disassembled, reducing maintenance costs and time. The flow channel on the copper slip ring communicates with the grease injection groove, allowing the injected grease to be evenly distributed between the drive push rod and the copper slip ring, forming an effective lubricating film. This continuously reduces the coefficient of friction between components, reduces wear, and improves the service life of the drive components. It also helps maintain the smooth movement of the drive push rod, ensuring precise execution of clamping actions.

[0015] 6) One end of the deformation shaft has a concave deformation hole along its axis, with the end of the hole being an arc surface. The width of the deformation hole is much smaller than the radius of the arc surface. The advantage of this structure is that when the driving component applies axial force, the deformation shaft can generate precise radial outward deformation due to the special structural design of the concave deformation hole. The arc surface end design makes the deformation smoother and more uniform, avoiding localized excessive deformation or damage caused by stress concentration. The smaller deformation hole width compared to the larger arc surface radius effectively controls the range and degree of deformation, allowing the deformation shaft to produce predictable and controllable radial deformation under different axial forces, thereby achieving precise clamping of workpieces of different sizes. For example, for workpieces with smaller diameters, a smaller axial force can be used to generate moderate radial deformation of the deformation shaft for clamping; for workpieces with larger diameters, the axial force can be increased to obtain a larger deformation to meet the clamping requirements.

[0016] 7) A radially outward deformation extrusion section is provided on the outer side of the deformation shaft. This section is arc-shaped, which has the advantage of better conforming to the workpiece's surface shape during clamping. Whether the workpiece surface is circular, elliptical, or has a certain curvature, the deformation extrusion section can maintain close contact, providing uniform clamping force. This uniform force distribution helps prevent deformation or damage to the workpiece due to excessive localized force during clamping, ensuring the clamping quality. Simultaneously, the good fit also improves clamping stability, reduces the possibility of workpiece displacement during processing, and ensures machining accuracy. Furthermore, an adjustment seat is located at one end of the deformation shaft, allowing for fine-tuning according to the specific shape and size of the workpiece. For example, when the workpiece shape has a certain deviation or a fine adjustment to the clamping position is required, the overall posture or local position of the deformation fixture components can be changed through the adjustment seat, further improving the fixture's adaptability to different workpieces and clamping accuracy. Attached Figure Description

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0018] Figure 1 This is an exploded view of a pneumatic clamp.

[0019] Figure 2 This is a front view of the pneumatic clamp. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please see the appendix Figures 1 to 2 The image shows a pneumatic clamp, comprising: a clamp base component 1, a drive component 2, and a deformation fixture component 3. The clamp base component 1 includes a clamp connecting base 11 and a lubrication seat 12 coaxially arranged, with adjacent clamp connecting bases 11 and lubrication seats 12 forming a movable chamber 5. The drive component 2 is movably disposed inside the movable chamber 5. The drive component 2 includes a drive push rod 21 coaxially arranged with the lubrication seat 12. A lubrication assembly 22 connected to the lubrication seat 12 is sleeved on the drive push rod 21. One end of the deformation fixture component 3 is fixed to the clamp connecting base 11, and the other end extends radially out of the lubrication seat 12. The deformation fixture component 3 includes a hollow deformation shaft 31. One end of the deformation shaft 31 is face-connected to an adjustment seat 32. In this embodiment, the sealed connection between the clamp connecting base and the lubrication seat, along with the movable chamber design, provides a stable operating space for the drive component, ensuring precise movement of the drive push rod and achieving accurate clamping. The sealing and positioning structure of the drive push rod ensures stable movement and precise positioning. The lubrication assembly effectively reduces friction, extends component life, and guarantees smooth clamping operations. The special structure of the deformation shaft in the deformation fixture component allows for precise deformation to adapt to different workpiece sizes. The arc-shaped design of the deformation extrusion section conforms to the workpiece, providing uniform clamping force, preventing workpiece deformation, and the adjustable seat allows for fine-tuning, improving adaptability and clamping accuracy.

[0023] Based on the above embodiments, the bottom of the lubrication seat 12 is inserted into the clamp connecting base 11, and adjacent seats are sealed together by sealing rings 13.

[0024] Based on the above embodiments, the lubrication seat 12 is provided with an inner movable chamber 123 with a mirror-like surface; the movable chamber is provided with a through columnar hole; the inner side of the columnar hole is provided with a grease injection groove 122 communicating with the outside; and a second sealing ring groove 121 is provided on both sides of the grease injection groove.

[0025] The clamp connecting base 11 has a recessed negative pressure groove 113 at one end, and a rubber ring 112 is provided on the periphery of the negative pressure groove; the clamp connecting base 11 has a through-hole convex locking hole 111 at the center, and the locking hole 111 has a locking thread.

[0026] Based on the above embodiments, a third sealing ring 211 is provided on the periphery of the drive push rod 21; a through deformation fixture insertion hole 212 is provided on the drive push rod 21; one end of the deformation fixture insertion hole 212 is set in a concave frustum shape; a positioning shoulder 213 adapted to the locking hole 111 is provided coaxially on the deformation fixture insertion hole 212.

[0027] The lubrication assembly 22 includes a copper seat slip ring 221 that is in contact with the lubrication seat 12; an annular fixing seat 222 is provided on the outer side of the copper seat slip ring 221; pads 223 are provided on both sides of the copper seat slip ring 221; and a pressure plate 224 is detachably installed on the top of the fixing seat 222.

[0028] Based on the above embodiments, the copper seat slip ring 221 is provided with a flow channel communicating with the grease injection groove 122.

[0029] Based on the above embodiments, one end of the deformation shaft 31 is provided with a concave deformation hole 311 along the axis; the end of the deformation hole 311 is provided with an arc surface; the outer side of the deformation shaft 31 is provided with a deformation extrusion part 312 that is radially outward; the deformation extrusion part 312 is provided with an arc surface.

[0030] Based on the above embodiments, the width of the deformation hole 311 is much smaller than the radius of the arc surface.

[0031] The working principle of this utility model is as follows: When using this pneumatic clamp, firstly, an appropriate amount of grease is injected into the lubrication seat through the grease injection groove. The grease forms a lubricating film between the drive push rod and the lubrication seat through the flow channel on the copper seat slip ring. Then, the drive component is installed in the movable chamber, so that the positioning shoulder of the drive push rod is engaged with the locking hole of the clamp connecting base for positioning and ensuring sealing. Next, the deformation shaft of the deformation jig component is inserted into the deformation jig insertion hole of the drive push rod, connecting it to the drive component. When an external air source supplies air to the movable chamber, the drive push rod moves axially under air pressure. Due to the engagement of the concave frustum-shaped structure at one end of the deformation jig insertion hole with the deformation shaft, the movement of the drive push rod will cause the deformation shaft to be subjected to axial force, thereby causing the deformation shaft to deform radially outward. The deformation extrusion part contacts the workpiece and clamps the workpiece. By adjusting the air source pressure, the moving distance of the drive push rod and the deformation amount of the deformation shaft can be precisely controlled, thereby achieving precise clamping of workpieces of different sizes. During the clamping process, the lubrication components continuously lubricate the drive push rod to ensure its smooth and stable movement.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make equivalent embodiments by making some changes or modifications to the above-disclosed technical content without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pneumatic clamp, characterized in that, include: The clamp seat component (1) includes a clamp connecting base (11) and a lubrication seat (12) coaxially arranged, and an active chamber (5) is formed between adjacent clamp connecting bases (11) and lubrication seats (12); A driving component (2) is movably disposed inside the movable chamber (5); the driving component (2) includes a driving push rod (21) coaxially disposed with the lubrication seat (12); a lubrication assembly (22) connected to the lubrication seat (12) is sleeved on the driving push rod (21); and The deformation fixture component (3) has one end fixed to the clamp connecting base (11) and the other end can extend out to the lubrication seat (12) in a radial direction; the deformation fixture component (3) includes a hollow deformation shaft (31); one end of the deformation shaft (31) is connected to an adjustment seat (32).

2. The pneumatic clamp as described in claim 1, characterized in that: The bottom of the lubrication seat (12) is inserted into the clamp connecting base (11), and adjacent seats are sealed together by sealing rings (13).

3. The pneumatic clamp as described in claim 2, characterized in that: The lubrication seat (12) is provided with an inner movable chamber (123) with a mirror-like surface; the movable chamber is provided with a through columnar hole; the inner side of the columnar hole is provided with a grease injection groove (122) communicating with the outside; and a second sealing ring groove (121) is provided on both sides of the grease injection groove. The clamp connecting base (11) has a recessed negative pressure groove (113) at one end, and a rubber ring (112) is provided on the periphery of the negative pressure groove; the clamp connecting base (11) has a through locking hole (111) in the center, and the locking hole (111) has a locking thread.

4. The pneumatic clamp as described in claim 1, characterized in that: The drive push rod (21) is provided with a third sealing ring (211) on its periphery; the drive push rod (21) is provided with a through deformation fixture insertion hole (212); one end of the deformation fixture insertion hole (212) is provided in the shape of a concave frustum; the deformation fixture insertion hole (212) is provided with a positioning shoulder (213) coaxially with the locking hole (111) to match it; The lubrication assembly (22) includes a copper seat slip ring (221) that is in contact with the lubrication seat (12); an annular fixing seat (222) is provided on the outside of the copper seat slip ring (221); pads (223) are provided on both sides of the copper seat slip ring (221); and a pressure plate (224) can be detachably installed on the top of the fixing seat (222).

5. The pneumatic clamp as described in claim 4, characterized in that: The copper seat slip ring (221) is provided with a flow channel that communicates with the grease injection groove (122).

6. The pneumatic clamp as described in claim 1, characterized in that: The deformation shaft (31) has a concave deformation hole (311) at one end along the axis; the end of the deformation hole (311) is set with an arc surface; the deformation shaft (31) has a deformation extrusion part (312) on the outside along the radial direction; the deformation extrusion part (312) is set with an arc surface.

7. The pneumatic clamp as described in claim 6, characterized in that: The width of the deformation hole (311) is much smaller than the radius of the arc surface.

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