Double-locking pneumatic shaft lock structure

Abstract

The utility model relates to the technical field of pneumatics, in particular to a double-locking pneumatic shaft lock structure which comprises a fixing seat, an end cover and a locked shaft. A clamping sleeve is arranged in the fixed seat, a guide sleeve is arranged in the end cover, and the outer wall of the locked shaft is sleeved with the guide sleeve and the clamping sleeve; the lock sleeve is sleeved on the outer wall of the guide sleeve through a steel ball, the locking piston is sleeved on the outer wall of the lock sleeve, and the locking piston is in a Z shape rotating by 90 degrees. And the side end of the locking piston is in contact connection with the end cover. Through precise matching of the guide sleeve, the clamping sleeve, the locking sleeve and the locking piston, stable locking of a locked shaft is achieved, the structure is compact, operation is stable, and the operation efficiency and safety of equipment are effectively improved; the inclined design of the outer wall of the jacket and the opposite inclination of the inner wall of the locking piston are matched with the action of the first spring and the second spring, so that a double-locking mechanism is formed, and the stability and the reliability of the shaft lock under complex working conditions are ensured.

Description

Technical Field

[0001] The utility model relates to the field of pneumatic technology, and more specifically to a double-locking pneumatic shaft lock structure. Background Art

[0002] In the fields of industrial automation, mechanical manufacturing, aerospace, etc., shaft lock structures are key components to ensure stable and safe operation of equipment; traditional shaft lock structures usually rely on mechanical locking methods, such as thread locking, pin locking, etc. Although these methods meet the locking requirements to a certain extent, they are insufficient in terms of operational convenience, locking force uniformity, and response speed. With the development of pneumatic technology, pneumatic shaft lock structures have gradually become a new trend in shaft lock technology due to their advantages such as simple operation, easy control of locking force, and fast response speed.

[0003] However, the existing pneumatic shaft lock structure still has room for improvement in locking effect and stability; especially in high vibration and high impact environments, the locking performance of the pneumatic shaft lock is easily affected, resulting in unstable operation of the equipment; therefore, the development of a double-locking pneumatic shaft lock structure with novel structure, excellent locking effect and high stability has important practical significance and application value. Utility Model Content

[0004] The purpose of the utility model is: in order to solve the above technical problems, the utility model provides a double-locking pneumatic shaft lock structure, which achieves an efficient and stable locking effect through a specific structure and design.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0006] The utility model proposes a double-locking pneumatic shaft lock structure, comprising a fixed seat, an end cover and a locked shaft; a clamping sleeve is arranged in the fixed seat, a guide sleeve is arranged in the end cover, and the guide sleeve and the clamping sleeve are sleeved on the outer wall of the locked shaft; the locking sleeve is sleeved on the outer wall of the guide sleeve through a steel ball, and the locking piston is sleeved on the outer wall of the locking sleeve, and its shape is a "Z" shape rotated 90 degrees; the side end of the locking piston is in contact with the end cover, the top end is in sliding connection with the inner wall of the fixed seat, and the side end of the upper half is connected to the end cover through a first spring;

[0007] The fixing seat is provided with an air inlet and an air outlet, the air inlet is located above the first spring, and the air outlet is located to the right of the locking piston and is blocked by a detachable unlocking screw; the outer wall of the jacket is inclined upward in a direction away from the end cover, and the inclination direction of the inner wall of the locking piston is opposite to that of the outer wall of the jacket, forming a complementary locking structure; the upward inclination angle of the outer wall of the jacket with respect to the horizontal direction of the locked shaft is 1.97;

[0008] In order to enhance the locking effect, the structure further includes a spring upper retaining ring and a spring lower retaining ring, both of which are sleeved outside the jacket and connected through a second spring; the side end of the spring upper retaining ring is in contact with the locking sleeve and the steel ball to ensure the stability of the locking structure;

[0009] In addition, the utility model also improves sealing and stability through the following optimization measures:

[0010] The inner wall of the end cover is provided with a coil-shaped dust scraper to reduce the impact of dust on the locking structure;

[0011] The inner wall of the end cover and the inner wall of the end of the fixing seat away from the end cover are both provided with a Y-shaped sealing ring to enhance the sealing performance;

[0012] A second O-ring is provided between the end cover and the fixing seat, and the end cover is provided with a groove for positioning the second O-ring;

[0013] A first O-ring is arranged between the bottom end of the locking piston close to the end cover and the end cover, and the locking piston is provided with a groove for positioning the first O-ring;

[0014] A C-ring is provided between the top of the locking piston and the fixing seat, and the locking piston is provided with a groove for positioning the C-ring;

[0015] A third O-ring is provided on the outer wall of the unlocking screw, and a groove for positioning the third O-ring is provided on the unlocking screw;

[0016] A fourth O-ring for sealing the decorative cover is disposed on a side wall of the fixing seat away from the end cover, and a groove for positioning the fourth O-ring is disposed on the fixing seat.

[0017] Furthermore, the end cover is detachably mounted on one end of the fixing base by means of a hexagonal screw.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model realizes stable locking of the locked shaft through the precise cooperation of the guide sleeve, the clamping sleeve, the locking sleeve and the locking piston. It has a compact structure and stable operation, and effectively improves the operating efficiency and safety of the equipment. Through the inclined design of the outer wall of the clamping sleeve and the opposite inclination of the inner wall of the locking piston, in coordination with the action of the first spring and the second spring, a double locking mechanism is formed, which ensures the stability and reliability of the shaft lock under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure numerals: 1. coil-shaped scraper ring; 2. Y-shaped sealing ring; 3. end cover; 4. hexagonal screw; 5. first O-ring; 6. guide sleeve; 7. second O-ring; 8. first spring; 9. locking sleeve; 10. steel ball; 11. locking piston; 12. fixing seat; 13. C-ring; 14. upper spring retaining ring; 15. jacket; 16. second spring; 17. third O-ring; 18. lower spring retaining ring; 19. steel wire retaining ring for shaft; 20. fourth O-ring; 21. unlocking screw; 22. air inlet; 23. air outlet. DETAILED DESCRIPTION

[0022] Example 1

[0023] Reference Figure 1 As shown, the utility model proposes a double-locking pneumatic shaft lock structure, including a fixed seat, an end cover and a locked shaft; a jacket is provided in the fixed seat, a guide sleeve is provided in the end cover, and the guide sleeve and the jacket are sleeved on the outer wall of the locked shaft; the locking sleeve is sleeved on the outer wall of the guide sleeve through a steel ball, and the locking piston is sleeved on the outer wall of the locking sleeve, and its shape is a "Z" shape rotated 90 degrees; the side end of the locking piston is in contact with the end cover, the top end is slidably connected to the inner wall of the fixed seat, and the side end of the upper half is connected to the end cover through a first spring;

[0024] The fixing seat is provided with an air inlet and an air outlet, the air inlet is located above the first spring, and the air outlet is located to the right of the locking piston and is blocked by a detachable unlocking screw; the outer wall of the jacket is inclined upward in a direction away from the end cover, and the inclination direction of the inner wall of the locking piston is opposite to that of the outer wall of the jacket, forming a complementary locking structure; the upward inclination angle of the outer wall of the jacket with respect to the horizontal direction of the locked shaft is 1.97;

[0025] In order to enhance the locking effect, the structure further includes a spring upper retaining ring and a spring lower retaining ring, both of which are sleeved outside the jacket and connected through a second spring; the side end of the spring upper retaining ring is in contact with the locking sleeve and the steel ball to ensure the stability of the locking structure;

[0026] In addition, the utility model also improves sealing and stability through the following optimization measures:

[0027] The inner wall of the end cover is provided with a coil-shaped dust scraper to reduce the impact of dust on the locking structure;

[0028] The inner wall of the end cover and the inner wall of the end of the fixing seat away from the end cover are both provided with a Y-shaped sealing ring to enhance the sealing performance;

[0029] A second O-ring is provided between the end cover and the fixing seat, and the end cover is provided with a groove for positioning the second O-ring;

[0030] A first O-ring is arranged between the bottom end of the locking piston close to the end cover and the end cover, and the locking piston is provided with a groove for positioning the first O-ring;

[0031] A C-ring is provided between the top of the locking piston and the fixing seat, and the locking piston is provided with a groove for positioning the C-ring;

[0032] A third O-ring is provided on the outer wall of the unlocking screw, and a groove for positioning the third O-ring is provided on the unlocking screw;

[0033] A fourth O-ring for sealing the decorative cover is disposed on a side wall of the fixing seat away from the end cover, and a groove for positioning the fourth O-ring is disposed on the fixing seat.

[0034] The end cover is detachably mounted on one end of the fixing seat by means of a hexagonal screw.

[0035] Working principle:

[0036] The practical double-locking pneumatic shaft lock structure mainly uses the pneumatic principle to realize the rapid locking and unlocking of the shaft lock; when gas is filled into the structure through the air inlet, the gas will push the locking piston to move along the direction of the locked shaft under the constraint of the locking sleeve and the guide sleeve; because the locking piston is designed to be a "Z" shape rotated 90 degrees, when the piston moves, its inner wall interacts with the outer wall of the jacket (the two are inclined in opposite directions), so that the locking piston generates a radial locking force around the locked shaft, thereby firmly locking the locked shaft;

[0037] When unlocking is required, the unlocking screw can be rotated and pulled out to open the air outlet, and the gas in the structure is discharged. The elastic force of the first spring pushes the locking piston back to the initial position, releasing the locking force on the locked shaft, thereby achieving unlocking;

[0038] In addition, the second spring, the spring upper retaining ring and the spring lower retaining ring in the structure are used in combination to provide additional support and stability for the locking piston, ensuring that the locking force can be evenly distributed in the locked state, thereby improving the reliability and stability of the locking.

[0039] in addition,

[0040] The upward inclination angle of the outer wall of the jacket relative to the horizontal direction of the locked shaft is specifically specified to be 1.97°; this precise angle design is not accidental, but the result of in-depth research and optimization, which is directly related to the holding force (i.e. locking force) that the shaft lock structure can generate in the locked state;

[0041] First of all, it is important to understand that the holding force is the radial clamping force generated by the shaft lock structure on the locked shaft in the locked state. In the pneumatic shaft lock structure, this force mainly comes from the interaction between the inner wall of the locking piston and the outer wall of the jacket due to the inclination angle when the gas pushes the locking piston. When the gas is filled, the locking piston moves along the direction of the locked shaft under the action of the gas pressure, and due to the inclination design of the outer wall of the jacket and the inner wall of the locking piston, a radial component force will be generated on the contact surface between the two. This component force is the main source of the holding force.

[0042] The 1.97° tilt angle is the optimal value obtained after careful calculation and test verification. It can ensure sufficient holding force while avoiding excessive friction caused by too large an angle during the movement of the locking piston, thereby affecting the locking effect or increasing the difficulty of operation. In addition, this angle can also ensure that during the unlocking process, the locking piston can smoothly return to the initial position to achieve quick unlocking.

[0043] Therefore, the inclination angle of 1.97° not only reflects the innovation and rationality of the structural design of the present invention, but also ensures that the shaft lock structure can provide a stable and reliable locking effect in practical applications, meeting the high requirements of industrial automation, mechanical manufacturing, aerospace and other fields for the shaft lock structure.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should be aware that the technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A double-locking pneumatic shaft lock structure, comprising a fixed seat (12), an end cover (3) mounted on one end of the fixed seat (12), and a locked shaft locked in the fixed seat (12), characterized in that: A guide sleeve (6) is provided inside the end cover (3); A clamping sleeve (15) is provided in the fixing seat (12), and the guide sleeve (6) and the clamping sleeve (15) are sleeved on the outer wall of the locked shaft; The locking sleeve (9) is sleeved on the outer wall of the guide sleeve (6) through the steel ball (10); The locking piston (11) is sleeved on the outer wall of the locking sleeve (9), the locking piston (11) is in a "Z" shape rotated 90 degrees, the side end of the locking piston (11) is in contact with the end cover (3), the top end of the locking piston (11) is in sliding connection with the inner wall of the fixing seat (12), and the side end of the upper half of the locking piston (11) is connected to the end cover (3) via a first spring (8); The fixing seat (12) is provided with an air inlet (22) and an air outlet (23), the air inlet (22) is located above the first spring (8), the air outlet (23) is located to the right of the locking piston (11), and the fixing seat (12) is provided with a detachable unlocking screw (21) for blocking the air outlet (23); The outer wall of the jacket (15) is inclined upward in a direction away from the end cover (3); The inner wall of the locking piston (11) is inclined in the opposite direction to the outer wall of the jacket (15); The spring upper retaining ring (14) and the spring lower retaining ring (18) can be movably mounted on the jacket (15); The spring upper retaining ring (14) and the spring lower retaining ring (18) are connected via a second spring (16); The side end of the spring upper retaining ring (14) is in contact with and connected to the lock sleeve (9) and the end surface of the steel ball (10) away from the end cover (3).

2. A double-locking pneumatic shaft lock structure according to claim 1, characterized in that: The upward inclination angle of the outer wall of the jacket (15) relative to the horizontal direction of the locked shaft is 1.97°, and the inclination angle of the inner wall of the locking piston (11) is opposite to the inclination angle of the outer wall of the jacket (15).

3. A double-locking pneumatic shaft lock structure according to claim 1, characterized in that: The inner wall of the end cover (3) is provided with a coil-shaped dust scraping ring (1), and the inner wall of the end cover (3) and the inner wall of the end of the fixing seat (12) away from the end cover (3) are both provided with a Y-shaped sealing ring (2).

4. A double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A shaft wire retaining ring (19) is provided at the lower end of the spring lower retaining ring (18).

5. The double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A second O-ring (7) is provided between the end cover (3) and the fixing seat (12), and the end cover (3) is provided with a groove for positioning the second O-ring (7).

6. A double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A first O-ring (5) is provided between the bottom end of the locking piston (11) close to the end cover (3) and the end cover (3), and the locking piston (11) is provided with a groove for positioning the first O-ring (5).

7. The double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A C-shaped ring (13) is provided between the top end of the locking piston (11) and the fixing seat (12), and the locking piston (11) is provided with a groove for positioning the C-shaped ring (13).

8. The double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A third O-ring (17) is provided on the outer wall of the unlocking screw (21), and a groove for positioning the third O-ring (17) is provided on the unlocking screw (21).

9. The double-locking pneumatic shaft lock structure according to claim 1, characterized in that: A fourth O-ring (20) for sealing the decorative cover is provided on a side wall of the fixing seat (12) away from the end cover (3), and a groove for positioning the fourth O-ring (20) is provided on the fixing seat (12).

10. A double-locking pneumatic shaft lock structure according to any one of claims 1 to 9, characterized in that: The end cover (3) is detachably mounted on one end of the fixing seat (12) by means of a hexagonal screw (4).

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