Clamp for workpiece to be ground

Abstract

The utility model relates to the technical field of clamp tools, in particular to a clamp for a workpiece to be ground. Comprising a first stator, a second stator and a mover, the first stator and the second stator are arranged on the outer sides of the two ends of the mover respectively, the mover is rotationally connected with the first stator and the second stator, a special-shaped cavity is formed in the mover and penetrates through the two ends of the mover to be used for containing workpieces, and a transverse positioning structure is arranged in the special-shaped cavity; the mover further comprises a longitudinal centering structure, the longitudinal centering structure comprises a centering block, the top of the centering block is connected with a piston mechanism through a connecting rod, and the piston mechanism telescopically moves to drive the centering block to move centripetally or centrifugally. According to the clamp, the positioning and clamping problems of the special-shaped workpiece are well solved, transverse positioning is completed, longitudinal positioning is completed in cooperation with a centering structure, and the clamp can be matched with a rotating mechanism to enable the workpiece to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of fixture tools, and particularly relates to a fixture for a workpiece to be ground. Background Art

[0002] When grinding an injector body workpiece, it is necessary to first position the injector body and then rotate it for grinding. However, the injector body has a special shape, and the positioning of the injector body includes lateral positioning and longitudinal centering. How to achieve accurate lateral positioning and longitudinal centering according to the external shape structure of the injector body is a technical problem to be solved. Content of the Utility Model

[0003] The problem to be solved is to provide a fixture that can achieve accurate lateral positioning and longitudinal positioning according to the external shape structure of the injector body.

[0004] To achieve the above object, the utility model provides the following technical solution: A fixture for a workpiece to be ground, including a stator one, a stator two and a rotor. The stator one and the stator two are respectively arranged on the outer sides of both ends of the rotor, and the rotor is rotatably connected to both the stator one and the stator two. An irregular cavity is arranged inside the rotor, and the irregular cavity penetrates through both ends of the rotor for placing the workpiece. A lateral positioning structure is arranged inside the irregular cavity; the rotor further includes a longitudinal centering structure, and the longitudinal centering structure includes a centering block. The top of the centering block is connected to a piston mechanism through a connecting rod, and the telescopic movement of the piston mechanism drives the centering block to move towards or away from the center.

[0005] Preferably, the piston mechanism is a hydraulic piston, including an upper oil cavity and a lower oil cavity. An annular oil passage one and an annular oil passage two are arranged at the contact position between the stator one and the rotor. The annular oil passage one is communicated with the upper oil cavity through an upper oil cavity pipeline, and the annular oil passage two is communicated with the lower oil cavity through a lower oil cavity pipeline. The upper oil cavity pipeline and the lower oil cavity pipeline are formed by drilling holes at corresponding positions on the rotor.

[0006] Preferably, there are two centering blocks, and the two centering blocks are symmetrically arranged with respect to the rotation center of the rotor. The two centering blocks move towards each other or away from each other under the drive of the piston mechanism, and the paths of the two centering blocks are the same.

[0007] Preferably, the annular oil passage one and the annular oil passage two are respectively provided with their own oil filling ports.

[0008] Preferably, the left end face and / or the right end face of the workpiece extends out of the end face of the irregular cavity.

[0009] Preferably, there is one centering block and it is semi-circular. The top of the midpoint of the arc of the centering block is connected to the piston mechanism through a connecting rod.

[0010] Compared with the prior art, the utility model provides a fixture for a workpiece to be ground, which has the following beneficial effects: The utility model designs a special-shaped cavity adapted to the outer shape of the workpiece according to the outer shape of the workpiece. It only needs to push or pull to put the workpiece in and take it out, and the installation is convenient; The lateral positioning structure is designed according to the outer shape of the workpiece, and the positioning method is simple and rapid; Coupled with the longitudinal centering structure, the characteristics of the piston mechanism shrinking are applied to the clamping and releasing of the workpiece. The piston mechanism adjusts the movement mode of the centering block through the connecting rod to achieve longitudinal centering. The fixture of the utility model preferably solves the problem of positioning and clamping of special-shaped workpieces. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the external structure of the utility model.

[0012] Figure 2 It is a schematic sectional view of the utility model.

[0013] Description of the reference numerals: 1. Workpiece; 11. Left end face; 12. Right end face; 2. Stator I; 21. Annular oil passage I; 22. Annular oil passage II; 3. Stator II; 4. Rotor; 41. Special-shaped cavity; 411. Lateral positioning structure; 42. Longitudinal centering structure; 421. Centering block; 422. Connecting rod; 423. Piston mechanism; 4231. Upper oil cavity; 4232. Lower oil cavity. Detailed Embodiment

[0014] Next, the technical solutions in the embodiments of the utility model will be described with reference to the drawings in the embodiments of the utility model:

[0015] As shown in the figure, the utility model is used to clamp and fix a workpiece 1 to be ground, and the workpiece 1 is the injector body. The utility model fixture includes a stator 1 2, a stator 2 3 and a mover 4. The stator 1 2 is clamped on the outside of one end of the mover 4, and the stator 2 3 is clamped on the outside of the other end of the mover 4; the stator 1 2 and the stator 2 3 are coaxial, and the mover 4 is rotatably connected with the stator 1 2 and the stator 2 3. The rotating axis of the mover 4 is the axis of the stator 1 2. A special-shaped cavity 41 is provided in the mover 4, and the special-shaped cavity 41 runs through both ends of the mover 4. The left end face of the workpiece 1 enters the special-shaped cavity 41 from the right end of the special-shaped cavity 41, and the workpiece 1 is pushed to the left. The workpiece 1 can be clamped into the special-shaped cavity 41. A transverse positioning structure 411 is provided in the special-shaped cavity 41, and the transverse positioning structure 411 is abutted against the protruding part of the workpiece 1 to realize the transverse positioning of the workpiece 1. The mover 4 also includes a longitudinal centering structure 42, which cooperates with the outer side of the middle part of the workpiece 1 to achieve coaxial fixation of the workpiece 1 and the stator 2. The longitudinal centering structure 42 includes a centering block 421. The top of the centering block 421 is connected to the piston mechanism 423 through a connecting rod 422. The telescopic movement of the piston mechanism 423 drives the centering block 421 to move centripetally or centrifugally. The piston mechanism 423 can be a hydraulic piston, including an upper oil chamber 4231 and a lower oil chamber 4232. An annular oil passage 1 21 and an annular oil passage 22 are provided at the contact position between the stator 2 and the mover 4. The annular oil passage 1 21 is connected to the upper oil chamber 4231 through an upper oil chamber pipeline, and the annular oil passage 22 is connected to the lower oil chamber 4232 through a lower oil chamber pipeline. The upper oil chamber pipeline and the lower oil chamber pipeline are formed by drilling holes at corresponding positions of the mover 4. There are two centering blocks 421, and the two centering blocks 421 are symmetrically arranged relative to the rotation center of the mover 4. The two centering blocks 421 move toward each other or in opposite directions under the drive of the piston mechanism 423, and the distances of the two centering blocks 421 are the same. The annular oil passage 1 21 and the annular oil passage 2 22 are respectively provided with respective oil filling ports. When supplying oil to the annular oil passage 121, the upper oil chamber 4231 pushes the connecting rod 422 downward as the hydraulic oil increases. During the downward movement of the connecting rod 422, the centering block 421 is forced to close to the axis and clamp the workpiece 1. The two centering blocks 421 move toward each other to complete the positioning of the axis of the workpiece 1. Since the symmetry axis of the two centering blocks 421 is the axis of the stator 12, the two centering blocks 421 have the same centripetal distance driven by the piston mechanism 423, thereby achieving the coincidence of the rotation axis of the workpiece 1 and the axis of the stator 12, and achieving longitudinal centering. When supplying oil to the annular oil passage 22, the hydraulic oil in the lower oil chamber 4232 gradually increases, pushing the connecting rod 422 upward, thereby driving the two centering blocks 421 to move in opposite directions, and releasing the workpiece 1. The mover 4 cooperates with the rotating mechanism to realize the rotation of the workpiece 1. The left end face 11 and the right end face 12 of the workpiece 1 are configured to extend out of the end face of the special-shaped cavity 41 as needed. The left end face 11 extends out of the left end face of the special-shaped cavity 41, and the right end face 12 extends out of the right end face of the special-shaped cavity 41.

[0016] The centering block 421 can also be a single piece and semi-circular, placed upside down in a bowl shape above the workpiece 1. The outer side of the top of the midpoint of the arc of the centering block 421 is connected to the piston mechanism 423 through a connecting rod 422. The radius of the centering block 421 is the same as the part of the radius of the workpiece 1 that cooperates with the centering block 421. The centering block 421 and the stator one 2 are coaxial. The telescopic movement of the piston mechanism 423 drives the centering block 421 to move up and down, realizing the close fit or separation between the centering block 421 and the workpiece 1.

[0017] During use, first connect the stator one 2 and the stator two 3 to both ends of the rotor 4. Since the workpiece 1 is of special shape and the outer diameter of the right end is larger than that of the left end, place the left end face 11 of the workpiece 1 into the right end of the special-shaped cavity 41 and push the workpiece 1 into the special-shaped cavity 41. When the workpiece 1 cannot be pushed anymore, it means that the lateral positioning structure 411 abuts against the protruding part of the workpiece 1 to complete lateral positioning; at this time, hold the right end face 12 to supply oil to the upper oil cavity 4231, forcing the two centering blocks 421 to synchronously converge towards the axis. After the convergence is in place, the piston mechanism 423 stops extending downward to complete longitudinal centering. At this time, the end face of the workpiece 1 can be ground; finally, after the grinding is completed, the workpiece 1 needs to be taken out of the special-shaped cavity 41. Supply oil to the lower oil cavity 4232, forcing the two centering blocks 421 to move away from the axis synchronously to release the workpiece 1. At this time, the longitudinal centering is released. Just draw out the workpiece 1 from the right end of the special-shaped cavity 41, and then put in the next workpiece 1 and repeat the above operations.

[0018] The above embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A fixture for a workpiece to be ground, characterized in that: It includes stator one (2), stator two (3) and rotor (4). Stator one (2) and stator two (3) are respectively arranged on the outer sides of both ends of the rotor (4), and the rotor (4) is rotatably connected to both stator one (2) and stator two (3). An irregular cavity (41) is provided inside the rotor (4). The irregular cavity (41) penetrates through both ends of the rotor (4) for placing the workpiece (1), and a transverse positioning structure (411) is provided inside the irregular cavity (41). The rotor (4) further includes a longitudinal centering structure (42). The longitudinal centering structure (42) includes a centering block (421). The top of the centering block (421) is connected to a piston mechanism (423) through a connecting rod (422). The telescopic movement of the piston mechanism (423) drives the centering block (421) to move centripetally or centrifugally.

2. The fixture for the workpiece to be ground according to claim 1, wherein: The piston mechanism (423) is a hydraulic piston, including an upper oil cavity (4231) and a lower oil cavity (4232). An annular oil passage one (21) and an annular oil passage two (22) are provided at the contact position between stator one (2) and the rotor (4). The annular oil passage one (21) is communicated with the upper oil cavity (4231) through an upper oil cavity pipeline, and the annular oil passage two (22) is communicated with the lower oil cavity (4232) through a lower oil cavity pipeline. The upper oil cavity pipeline and the lower oil cavity pipeline are formed by drilling holes at the corresponding positions of the rotor (4).

3. The fixture for the workpiece to be ground according to claim 2, characterized in that: There are two centering blocks (421). The two centering blocks (421) are symmetrically arranged with respect to the rotation center of the rotor (4). The two centering blocks (421) move towards each other or in the opposite direction under the drive of the piston mechanism (423), and the paths of the two centering blocks (421) are the same.

4. The workpiece fixture to be ground according to claim 3, characterized in that: The annular oil passage one (21) and the annular oil passage two (22) are respectively provided with their own oil filling ports.

5. The fixture for the workpiece to be ground according to claim 4, characterized in that: The left end face (11) of the workpiece (1) and / or the right end face (12) of the workpiece (1) extend out of the end face of the irregular cavity (41).

6. The fixture for the workpiece to be ground according to claim 1, wherein: The centering block (421) is one piece and is semi-circular. The top of the midpoint of the arc of the centering block (421) is connected to the piston mechanism (423) through a connecting rod (422).

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