Clamping jaw structure for inner circle machining of compressor piston
Patent Information
- Application Number
- CN202522630055.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-11
AI Technical Summary
[0004]然而，上述仅依靠径向夹持的方案，由于未设置有效的轴向压紧机构，使得工件在加工过程中存在稳定性隐患，这种轴向约束的缺失易导致活塞发生轴向窜动及绕轴线转动，难以完全抵消加工时产生的复杂受力，其后果是工件可能产生微位移或振动，不仅直接影响内圆加工的形状精度与表面质量，在持续加工中还可能引发刀具的非正常磨损，最终影响产品的尺寸一致性及加工过程的可靠性
[0010]与现有技术相比，本实用新型的有益效果是：通过设置可同步动作的径向夹爪与轴向夹爪，在夹持过程中既能从活塞外圆周壁面施加径向夹紧力，又能同时从活塞顶部施加轴向压紧力，形成双向约束。这种结构有效克服了传统单一径向夹持时工件易轴向窜动和绕轴转动的问题，使工件在加工过程中保持稳定，既保障了内圆加工的形状精度与表面质量，又避免了因工件微位移导致的刀具异常磨损，提升了加工可靠性与产品一致性。
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Figure CN224914204U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor piston processing technology, specifically a gripper structure for processing the inner circle of a compressor piston. Background Technology
[0002] As a core power source in many industrial and consumer sectors, the compressor's working principle relies on the periodic change of its internal volume to achieve gas compression. In this process, the piston, as a key actuator, is typically designed as a cylindrical structure that reciprocates within the cylinder. To ensure the compressor's smooth operation and energy efficiency, stringent requirements are placed on the geometric accuracy and surface quality of each part of the piston assembly. Among these, the dimensional accuracy and geometric tolerances of the piston's inner circle are crucial, thus requiring high-precision machining to meet assembly and functional requirements.
[0003] In the existing technology, the common approach for machining the inner circle of a compressor piston is to clamp and position the outer surface of the piston. Specifically, this method usually uses hydraulic or pneumatic drive components to drive a set of clamping plates with arc-shaped contours to move synchronously, thereby applying radial clamping force from the outer circumferential wall of the piston to fix the workpiece on the machine tool. Under this configuration, the main finishing processes such as boring, grinding or polishing of the inner circle of the piston are usually performed, and the corresponding machining equipment is usually set above the top of the workpiece.
[0004] However, the above-mentioned scheme that relies solely on radial clamping lacks an effective axial clamping mechanism, which poses a stability risk to the workpiece during processing. This lack of axial constraint can easily cause the piston to move axially and rotate around its axis, making it difficult to completely counteract the complex forces generated during processing. As a result, the workpiece may experience micro-displacement or vibration, which not only directly affects the shape accuracy and surface quality of the inner circle machining, but may also cause abnormal tool wear during continuous processing, ultimately affecting the dimensional consistency of the product and the reliability of the machining process. Utility Model Content
[0005] The purpose of this invention is to provide a gripper structure for machining the inner circle of a compressor piston, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a gripper structure for machining the inner circle of a compressor piston, comprising: radial grippers and axial grippers arranged in an array along the circumferential direction of the machining table; a liftable support plate installed at the center of the machining table; an anti-slip soft block fixedly provided on the side of the radial grippers facing the axis of the machining table; and an anti-slip soft pad fixedly provided on the lower surface of the axial grippers facing the axis of the machining table. A fixing block is provided on the side of the radial gripper and the axial gripper away from the axis of the machining table. The lower surface of the fixing block is fixedly connected to the machining table. The top of the axial gripper and the fixing block are rotatably connected by a limit pin. A limit rod is fixedly provided on the side of the radial gripper away from the anti-slip soft block. A limit hole is opened at the bottom of the fixing block to slide with the limit rod. A drive assembly is provided on the side of the fixed block away from the radial and axial jaws. The drive assembly is used to synchronously drive the radial jaws to move radially along the machining table and synchronously drive the axial jaws to rotate in a direction close to or away from the axis of the machining table. Preferably, the lower surface of the processing table is fixedly connected to the top of the support column, the bottom end of the support column is fixedly connected to the mounting plate, and a positioning ring is fixedly connected to the upper surface of the processing table.
[0007] Preferably, a cylinder is fixedly connected to the upper surface of the mounting plate, and the output end of the cylinder is fixedly connected to the support plate.
[0008] Preferably, a limiting ring is fixedly connected to the edge of the upper surface of the machining table, and the driving assembly includes a gear ring disposed on the edge of the upper surface of the machining table, a paddle block fixedly connected to the outer circumferential surface of the gear ring, a gear meshing with the upper side of the gear ring, an adjusting rod threadedly connected to the gear, a driving rod rotatably connected to the adjusting rod through a limiting bearing, a connecting rod fixedly connected to the top of the outer ring surface of the driving rod, a driving block fixedly connected to the connecting rod, and a sliding pin fixedly sleeved in the driving block.
[0009] Preferably, the upper surface of the gear ring is provided with an annular groove, the bottom of the limiting ring is inserted into the annular groove and is slidably connected with the annular groove, the gear is rotated and locked on the top of the support frame, the bottom of the support frame is fixedly connected to the outer peripheral surface of the processing table, the drive rod is fixedly connected to the limiting rod, and guide holes are provided on both sides of the axial gripper, and the guide holes are slidably connected to the sliding pin.
[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: by setting radial and axial grippers that can move synchronously, a radial clamping force can be applied from the outer circumferential wall of the piston during the clamping process, while an axial clamping force can be applied from the top of the piston simultaneously, forming a bidirectional constraint. This structure effectively overcomes the problem of workpiece axial movement and rotation around the axis that is common in traditional single radial clamping, keeping the workpiece stable during processing. This ensures the shape accuracy and surface quality of the inner circle machining, avoids abnormal tool wear caused by workpiece micro-displacement, and improves machining reliability and product consistency. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a top view of the internal structure of this utility model; Figure 4 This is a bottom view of the internal structure of this utility model.
[0012] In the diagram: 1. Machining table; 2. Radial gripper; 3. Axial gripper; 4. Anti-slip block; 5. Anti-slip pad; 6. Fixing block; 7. Limiting rod; 8. Limiting hole; 9. Support plate; 10. Support column; 11. Mounting plate; 12. Cylinder; 13. Positioning ring; 14. Limiting ring; 15. Gear ring; 16. Gear; 17. Adjusting rod; 18. Drive rod; 19. Connecting rod; 20. Drive block; 21. Sliding pin; 22. Annular groove; 23. Support frame; 24. Guide hole; 25. Altering block. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0014] Example 1: Please refer to Figures 1-4 This utility model provides a technical solution: a gripper structure for machining the inner circle of a compressor piston, comprising: radial grippers 2 and axial grippers 3 arranged in an array along the circumference of a machining table 1. The machining table 1 indirectly supports the radial grippers 2 and axial grippers 3. A liftable support plate 9 is installed at the center of the machining table 1. When the support plate 9 is lowered, it is lower than the machining table 1, so that the workpiece can be placed on the upper surface of the support plate 9. When the support plate 9 is raised, until its upper surface is flush with the upper surface of the machining table 1, the workpiece is initially fixed on the machining table 1. Anti-slip soft blocks 4 are fixedly provided on the side of the radial grippers 2 facing the axis of the machining table 1. The radial grippers 2 are arc-shaped to facilitate contact with the outer circle of the piston. The axial grippers 3 are fixedly provided on the lower surface facing the axis of the machining table 1. A non-slip soft pad 5 is provided. A fixing block 6 is provided on the side of the radial gripper 2 and the axial gripper 3 away from the axis of the processing table 1. The lower surface of the fixing block 6 is fixedly connected to the processing table 1. The top of the axial gripper 3 and the fixing block 6 are rotatably connected by a limiting pin. A limiting rod 7 is fixedly provided on the side of the radial gripper 2 away from the non-slip soft pad 4. A limiting hole 8 is opened at the bottom of the fixing block 6 to slide with the limiting rod 7. The limiting rod 7 is guided and limited by the limiting hole 8, so that the limiting rod 7 guides and limits the radial gripper 2. A driving assembly is provided on the side of the fixing block 6 away from the radial gripper 2 and the axial gripper 3. The driving assembly is used to synchronously drive the radial gripper 2 to move radially along the processing table 1 and synchronously drive the axial gripper 3 to rotate in the direction close to or away from the axis of the processing table 1.
[0015] In use, the support plate 9 is lowered to the bottom of the processing table 1, at which point the workpiece can be placed on the support plate 9. Then, the support plate 9 is raised until its upper surface is flush with the upper surface of the processing table 1, thus initially positioning the workpiece. Then, driven by the drive assembly, the radial gripper 2 moves radially toward the processing table 1 under the sliding engagement of the limiting rod 7 and the limiting hole 8, and moves toward the outer circle of the workpiece. At the same time, driven by the drive assembly, the axial gripper 3 rotates toward the axis of the processing table 1. When the radial gripper 2 drives the anti-slip soft block 4 to tightly abut against the outer circle of the piston workpiece, the axial gripper 3 drives the anti-slip soft pad 5 to press against the edge of the upper surface of the piston workpiece. This simultaneously clamps the outer circumferential wall of the piston workpiece and presses it axially, making the workpiece more stable during the fixed clamping process. This ultimately prevents the piston from axially moving or rotating around the axis, improving processing accuracy and quality.
[0016] Example 2: Based on Example 1, the lower surface of the processing table 1 is fixedly connected to the top of the support column 10, the bottom end of the support column 10 is fixedly connected to the mounting plate 11, and a positioning ring 13 is fixedly connected to the upper surface of the processing table 1. The mounting plate 11 is convenient to be fixedly connected to the body of the processing equipment. After the mounting plate 11 is fixedly installed, the processing table 1 is fixedly supported by the support column 10. A cylinder 12 is fixedly connected to the upper surface of the mounting plate 11. The cylinder 12 is electrically connected to the external control equipment. The output end of the cylinder 12 is fixedly connected to the support plate 9. The cylinder 12 drives the support plate 9 to rise and fall, thereby facilitating the control of the workpiece rising and falling, and thus facilitating the picking and placing of the workpiece.
[0017] Example 3: Based on Example 2, a limiting ring 14 is fixedly connected to the edge of the upper surface of the processing table 1. The driving assembly includes a gear ring 15 disposed on the edge of the upper surface of the processing table 1, a lever 25 fixedly connected to the outer circumferential surface of the gear ring 15, which can drive the gear ring 15 to rotate by moving the lever 25, a gear 16 meshing with the upper side of the gear ring 15, an adjusting rod 17 threadedly connected to the gear 16, a driving rod 18 rotatably connected to the adjusting rod 17 through a limiting bearing, the limiting bearing adopting an installation method of inner ring rotation and outer ring fixation, a connecting rod 19 fixedly connected to the top of the outer ring surface of the driving rod 18, a driving block 20 fixedly connected to the connecting rod 19, and a sliding pin 21 fixedly sleeved in the driving block 20. The upper surface of the gear ring 15 A ring groove 22 is provided, and the bottom of the limiting ring 14 is inserted into the ring groove 22 and slidably connected with the ring groove 22, thereby limiting the gear ring 15 on the upper surface of the processing table 1, so as to facilitate its rotation on the processing table 1. The gear 16 is rotatably locked onto the top of the support frame 23, and the bottom of the support frame 23 is fixedly connected to the outer peripheral surface of the processing table 1. The support frame 23 locks and supports the gear 16, thereby facilitating the meshing transmission between the gear 16 and the gear ring 15. The drive rod 18 is fixedly connected to the limiting rod 7. One end of the drive rod 18 is fixedly connected to the limiting rod 7, and the other end of the drive rod 18 is rotatably connected to the adjusting rod 17 through the limiting bearing. Guide holes 24 are provided on both sides of the axial gripper 3, and the guide holes 24 are slidably connected to the sliding pin 21.
[0018] The cylinder 12 extends and retracts, thereby raising and lowering the support plate 9. When the support plate 9 descends, it facilitates the loading and unloading of materials. When the support plate 9 rises, it facilitates the initial positioning of the materials on the upper surface of the processing table 1. After the piston workpiece is initially positioned by the positioning ring 13, By gripping the lever 25 and pushing it along the circumference of the gear ring 15, the lever 25 moves a distance less than one-quarter of the circumference of the gear ring 15. The lever 25 then drives the gear ring 15 to rotate under the limit of the limiting ring 14. Simultaneously, the gear ring 15 meshes with the gear 16, causing the gear 16 to rotate under the limit of the support frame 23. Since the gear 16 is threadedly connected to the adjusting rod 17, it drives the adjusting rod 17 to move closer to the fixed block 6 along its axis. With the fixed connection of the drive rod 18, connecting rod 19, and limiting rod 7, the radial gripper 2 drives the anti-slip soft block 4 to move towards the outer surface of the piston workpiece, while the connecting rod 19 drives the drive block 20 to move synchronously. The drive block 20 drives the sliding pin fixedly sleeved on it. 21 slides within the guide hole 24, thereby pushing the axial gripper 3 to move closer to the upper surface of the piston workpiece. Simultaneously, under the limit of the limiting pin, the axial gripper 3 rotates towards the upper surface of the piston workpiece. When the axial gripper 3 drives the anti-slip pad 5 to press against the upper surface of the workpiece, the radial gripper 2 drives the anti-slip block 4 to fit tightly against the outer circumferential surface of the piston workpiece. This achieves circumferential fixation of the workpiece while also pressing it against its axial direction, further improving the stability of the workpiece after clamping and fixing. This avoids the possibility of the workpiece undergoing micro-displacement or vibration, which not only directly affects the shape accuracy and surface quality of the inner circle machining but may also cause abnormal tool wear. When it is necessary to disassemble the workpiece, simply reverse the circumferential movement of the lever 25.
[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A gripper structure for machining the inner diameter of a compressor piston, comprising radial grippers (2) and axial grippers (3) arranged in an array along the circumferential direction of a machining table (1), characterized in that: The processing table (1) is equipped with a liftable support plate (9) at its center. The radial gripper (2) is fixedly provided with an anti-slip soft block (4) on one side facing the axis of the processing table (1). The axial gripper (3) is fixedly provided with an anti-slip soft pad (5) on the lower surface facing the axis of the processing table (1). A fixing block (6) is provided on the side of the radial gripper (2) and the axial gripper (3) away from the axis of the processing table (1). The lower surface of the fixing block (6) is fixedly connected to the processing table (1). The top of the axial gripper (3) and the fixing block (6) are rotatably connected by a limiting pin. A limiting rod (7) is fixedly provided on the side of the radial gripper (2) away from the anti-slip soft block (4). A limiting hole (8) is opened at the bottom of the fixing block (6) to slide with the limiting rod (7). A drive assembly is provided on the side of the fixed block (6) away from the radial jaw (2) and the axial jaw (3). The drive assembly is used to synchronously drive the radial jaw (2) to move radially along the machining table (1) and synchronously drive the axial jaw (3) to rotate in a direction close to or away from the axis of the machining table (1).
2. The gripper structure for machining the inner circle of a compressor piston according to claim 1, characterized in that: The lower surface of the processing table (1) is fixedly connected to the top of the support column (10), the bottom end of the support column (10) is fixedly connected to the mounting plate (11), and a positioning ring (13) is fixedly connected to the upper surface of the processing table (1).
3. The gripper structure for machining the inner circle of a compressor piston according to claim 2, characterized in that: A cylinder (12) is fixedly connected to the upper surface of the mounting plate (11), and the output end of the cylinder (12) is fixedly connected to the support plate (9).
4. The gripper structure for machining the inner circle of a compressor piston according to claim 1, characterized in that: The upper surface edge of the processing table (1) is fixedly connected to a limiting ring (14). The driving assembly includes a gear ring (15) set on the upper surface edge of the processing table (1), a paddle block (25) fixedly connected to the outer circumferential surface of the gear ring (15), a gear (16) meshing with the upper side of the gear ring (15), an adjusting rod (17) threadedly connected to the gear (16), a driving rod (18) rotatably connected to the adjusting rod (17) through a limiting bearing, a connecting rod (19) fixedly connected to the top of the outer ring surface of the driving rod (18), a driving block (20) fixedly connected to the connecting rod (19), and a sliding pin (21) fixedly sleeved in the driving block (20).
5. The gripper structure for machining the inner circle of a compressor piston according to claim 4, characterized in that: The upper surface of the gear ring (15) is provided with an annular groove (22). The bottom of the limiting ring (14) is inserted into the annular groove (22) and is slidably connected with the annular groove (22). The gear (16) is rotated and clamped on the top of the support frame (23). The bottom of the support frame (23) is fixedly connected to the outer circumference of the processing table (1). The drive rod (18) is fixedly connected to the limiting rod (7). The two side walls of the axial gripper (3) are provided with guide holes (24). The guide holes (24) are slidably connected to the sliding pin (21).