Self-centering mechanism

Abstract

The utility model provides a self-centering mechanism, which is simple in structure, prevents blocking during centering, ensures stable centering and improves centering effect, and is characterized by comprising a fixed seat, three guide holes are symmetrically arranged on the fixed seat, the end parts of the guide holes are connected with a central hole, guide rods are respectively arranged in the guide holes, and the guide rods are connected with the central hole. A movable push rod is arranged in the center hole and provided with a conical surface, and a guide rod conical surface matched with the conical surface is arranged at the end, corresponding to the movable push rod, of the guide rod.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and particularly relates to a self-centering mechanism. Background Art

[0002] Existing self-centering mechanisms usually adopt a wedge mechanism such as Figure 1 As shown, the wedge mechanism 1 converts the input force or torque into a pressure perpendicular to the inclined plane and a movement parallel to the inclined plane through the geometric shape of the inclined plane 2 and the action of an external force, achieving the effect of force transmission and conversion. This structure has high machining requirements, may wear and jam after long-term use, has a short service life, and is suitable for small-diameter positioning. Summary of the Invention

[0003] The utility model provides a self-centering mechanism, which has a simple structure, prevents jamming during centering, ensures stable centering, and improves the centering effect.

[0004] The technical solution of the utility model is as follows:

[0005] A self-centering mechanism, characterized in that: it includes a fixed seat, three guiding holes are symmetrically arranged on the fixed seat, the end of the guiding hole is connected to a central hole, guiding rods are respectively arranged in the guiding holes, a movable push rod is arranged in the central hole, the movable push rod is provided with a conical surface, and one end of the guiding rod corresponding to the movable push rod is provided with a guiding rod conical surface that cooperates with the conical surface.

[0006] It is further characterized in that the guiding rod is connected to a supporting head; a positioning bushing is arranged on the central hole, the movable push rod is arranged in the positioning bushing; a threaded push cylinder is arranged corresponding to the movable push rod; a positioning sleeve is arranged on the other side of the central hole corresponding to the positioning bushing, and the positioning sleeve cooperates with the movable push rod; guiding sleeves are respectively arranged on the fixed seat corresponding to the guiding holes, the guiding rods are arranged in the guiding sleeves and cooperate with the guiding sleeves; bushings are respectively arranged in the guiding holes; protrusions are respectively arranged on the guiding rods, a compression spring is sleeved on the guiding rod, one end of the compression spring abuts against the protrusion, and the other end of the compression spring is connected to the fixed seat to form an extrusion on the guiding rod; the guiding sleeve includes a guiding extension sleeve, the guiding extension sleeve is arranged in the guiding hole, and the compression spring abuts against the guiding extension sleeve; the positioning bushing and the positioning sleeve are respectively connected to the fixed seat by bolts.

[0007] By adopting the above technical solution, three guiding holes are symmetrically arranged on the fixed seat. The end of the guiding hole is connected to the central hole. Guiding rods are respectively arranged in the guiding holes, and a movable push rod is arranged in the central hole. The movable push rod is provided with a conical surface, and the guiding rod is provided with a guiding rod conical surface at one end corresponding to the movable push rod, which is matched with the conical surface. The end of the guiding rod supports the workpiece to be positioned. The movement of the movable push rod synchronously squeezes the guiding rod conical surface through the conical surface, realizing the synchronous support and positioning of the three guiding rods for the workpiece, preventing jamming during centering, ensuring stable centering, and improving the centering effect. Description of the Drawings

[0008] Figure 1 is a schematic diagram of an existing self-centering mechanism;

[0009] Figure 2 Schematic diagram of the self-centering mechanism of the present utility model;

[0010] Figure 3 is Figure 2 A - A sectional view of Detailed Embodiment

[0011] The following further describes the detailed embodiment of the present utility model with reference to the drawings.

[0012] See Figure 2 and Figure 3 , a self-centering mechanism, which includes a fixed seat 1. Three guiding holes 2 are symmetrically arranged on the fixed seat 1. The end of the guiding hole 2 is connected to the central hole 3. Guiding rods 4 are respectively arranged in the guiding holes 2, and a movable push rod 5 is arranged in the central hole 3. The movable push rod 5 is provided with a conical surface 6. The guiding rod 4 is provided with a guiding rod conical surface 7 at one end corresponding to the movable push rod 5, which is matched with the conical surface 6. The end of the guiding rod supports the workpiece to be positioned. The movement of the movable push rod synchronously squeezes the guiding rod conical surface through the conical surface, realizing the synchronous support and positioning of the three guiding rods for the workpiece, preventing jamming during centering, ensuring stable centering, and improving the centering effect.

[0013] A positioning bushing 8 is arranged on the central hole 3. The movable push rod 5 is arranged in the positioning bushing 8. A positioning sleeve 9 is arranged on the other side of the central hole 3 corresponding to the positioning bushing 8. The positioning sleeve 9 is matched with the movable push rod 5. The positioning bushing 8 and the positioning sleeve 9 are respectively connected to the fixed seat 1 through bolts 10. By arranging the positioning bushing and the positioning sleeve, the simple and accurate positioning of the movable push rod is ensured, and at the same time, the wear and damage of the movable push rod are prevented. When the positioning bushing and the positioning sleeve are damaged, the positioning bushing and the positioning sleeve can be replaced, reducing the replacement of the movable push rod on the premise of ensuring the work of the movable push rod, and effectively reducing the production cost.

[0014] A threaded push cylinder 11 is arranged corresponding to the movable push rod 5 to ensure and realize the work of the movable push rod.

[0015] The fixing seat 1 is provided with guide sleeves 12 corresponding to the guide holes 2, and the guide rods 4 are arranged in the guide sleeves 12 and cooperate with the guide sleeves 12 to ensure the stability of the movement of the guide rods and effectively ensure the balance of the movement of the three guide rods.

[0016] Bushings 13 are respectively arranged in the guide holes 2 to ensure simple and accurate positioning of the guide rod and prevent the guide rod from being worn and damaged. When the bushings are used, the bushings can be replaced in time. Under the premise of ensuring the operation of the guide rod, the replacement of the guide rod is reduced, thereby effectively reducing the production cost.

[0017] The guide rods 4 are respectively provided with protrusions 14, and compression springs 15 are sleeved on the guide rods 4. One end of the compression spring 15 abuts against the protrusion 14. The guide sleeve 12 includes a guide extension sleeve 16. The guide extension sleeve 16 is arranged in the guide hole 2. The other end of the compression spring abuts against the guide extension sleeve 16, so that the other end of the compression spring 15 is connected to the fixed seat 1, so that the compression spring squeezes the guide rod 4, ensures the automatic contraction of the guide rod, and ensures stable and accurate positioning.

[0018] The guide rod 4 is connected to the support head 17 to ensure the stability of the support and realize the replacement of the support head, thereby effectively reducing the production cost.

[0019] The working principle of the utility model is briefly described below in conjunction with the accompanying drawings:

[0020] The threaded push cylinder 11 extends to push the movable push rod 5, and the cone surface 6 between the movable push rod 5 and the guide rod 4 synchronously squeezes the guide rod cone surface 7, converting the input force into pressure perpendicular to the inclined surface and movement parallel to the inclined surface. The guide rod 4 extends to support the workpiece to complete the positioning. When the positioning is released, the threaded push cylinder 11 retracts, and the guide rod 4 moves inward by the spring force of the compression spring 15. Similarly, the transmission and conversion of force is realized through the cone surface 6 and the guide rod cone surface 7 to make the movable push rod 5 descend and prepare for the next action.

[0021] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the utility model.

Claims

1. A self-centering mechanism, characterized in that: The invention comprises a fixing seat (1), three guide holes (2) are symmetrically arranged on the fixing seat (1), the ends of the guide holes (2) are connected to the center hole (3), guide rods (4) are respectively arranged in the guide holes (2), a movable push rod (5) is arranged in the center hole (3), the movable push rod (5) is provided with a conical surface (6), and a guide rod conical surface (7) matching the conical surface (6) is arranged at one end of the guide rod (4) corresponding to the movable push rod (5).

2. A self-centering mechanism according to claim 1, characterized in that: The guide rod (4) is connected to the support head (17).

3. A self-centering mechanism according to claim 1, characterized in that: A positioning bushing (8) is provided on the central hole (3), and the movable push rod (5) is arranged in the positioning bushing (8).

4. A self-centering mechanism according to claim 3, characterized in that: A positioning sleeve (9) is provided on the center hole (3) corresponding to the other side of the positioning bushing (8), and the positioning sleeve (9) cooperates with the movable push rod (5).

5. A self-centering mechanism according to claim 1, characterized in that: A threaded push cylinder (11) is provided corresponding to the movable push rod (5).

6. A self-centering mechanism according to claim 1, characterized in that: The fixing seat (1) is provided with guide sleeves (12) corresponding to the guide holes (2), and the guide rod (4) is arranged in the guide sleeves (12) and cooperates with the guide sleeves (12).

7. A self-centering mechanism according to claim 1, characterized in that: Bushings (13) are respectively arranged in the guide holes (2).

8. A self-centering mechanism according to claim 6, characterized in that: The guide rods (4) are respectively provided with protrusions (14), and the guide rods (4) are sleeved with compression springs (15), one end of the compression spring (15) abuts against the protrusions (14), and the other end of the compression spring (15) is connected to the fixing seat (1), thereby squeezing the guide rods (4).

9. A self-centering mechanism according to claim 8, characterized in that: The guide sleeve (12) comprises a guide extension sleeve (16), the guide extension sleeve (16) is arranged in the guide hole (2), and the compression spring (15) abuts against the guide extension sleeve (16).

10. A self-centering mechanism according to claim 4, characterized in that: The positioning bushing (8) and the positioning sleeve (9) are respectively connected to the fixing seat via bolts (10).

Images