CN215950021U

CN215950021U - Anti-loosening hydraulic cylinder

Info

Publication number: CN215950021U
Application number: CN202122660458.8U
Authority: CN
Inventors: 张邦柱; 赵胜
Original assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Current assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-03-04
Anticipated expiration: 2031-11-02

Abstract

The utility model belongs to the technical field of hydraulic pressure, and discloses a locking hydraulic cylinder which is mainly used for solving the problem that a piston and a piston rod in the existing hydraulic cylinder are easy to loosen. The connecting part of the piston and the piston rod is provided with the steel ball which is limited in the arc groove of the piston rod by the screw on the piston, so that the relative axial movement of the piston and the piston rod can be limited, the mode is simple and convenient to install, the anti-loosening performance is good, the oil leakage phenomenon caused by loose connection between the piston and the piston rod of the hydraulic cylinder in a high-pressure working environment can be improved, the thrust loss of the hydraulic cylinder is reduced, and the normal operation of the hydraulic cylinder is ensured; meanwhile, the abrasion between the piston and the piston rod can be reduced, and the service life of the hydraulic cylinder is prolonged.

Description

Anti-loosening hydraulic cylinder

Technical Field

The utility model belongs to the technical field of hydraulic pressure, and particularly relates to a locking hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and does linear reciprocating motion or swinging motion, has simple structure and reliable work, can omit a speed reducer when the hydraulic cylinder is used for realizing reciprocating motion, has no transmission clearance, and moves stably, thereby being widely applied to hydraulic systems of various machines.

The hydraulic cylinders have various structural forms, which can be roughly divided into piston type, plunger type, telescopic type, rack and pinion type and the like, and piston type and telescopic type hydraulic cylinders have piston type structures inside, so that long stroke can be realized, the structure is compact, and the hydraulic cylinders are often used for engineering machinery and agricultural machinery.

Among current piston or telescopic pneumatic cylinder, for reducing the manufacturing degree of difficulty of piston, can part the piston with the piston rod and make usually, rethread threaded connection, and because the pneumatic cylinder is under highly compressed operational environment for a long time, the piston rod can appear becoming flexible with the junction of piston, lead to connection between them unstable and the phenomenon of the hydraulic oil of hydraulic cylinder rodless intracavity and the hydraulic oil seepage each other that has the pole intracavity appears, the thrust that causes the hydraulic stem is not enough, the condition such as speed decline, more can aggravate the wearing and tearing between the spare part, reduce the holistic life of pneumatic cylinder.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the anti-loosening hydraulic cylinder, the piston on the anti-loosening hydraulic cylinder is tightly connected with the piston rod, the looseness is not easy to occur, and the oil leakage phenomenon is greatly improved.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a check hydraulic cylinder comprises a piston and a piston rod correspondingly connected with the piston, wherein a steel ball is arranged on the connecting surface of the piston and the piston rod, an arc groove matched with the steel ball is formed in the piston rod, a threaded hole used for installing the steel ball is formed in the piston, and a screw is arranged in the threaded hole to limit the steel ball in the arc groove.

Furthermore, a supporting ring is arranged above the screw.

Furthermore, the piston comprises a first-stage piston and a second-stage piston, and the first-stage piston is provided with a support seat for limiting the stroke of the second-stage piston.

Furthermore, the abutting seat is annular and is connected with the primary piston through threads.

Furthermore, a threaded connection part of the abutting seat and the primary piston is provided with threaded anti-loosening glue.

Furthermore, the device also comprises a guide sleeve, the piston rod is sleeved in the guide sleeve, and a sealing group is arranged between the guide sleeve and the piston rod.

Further, the sealing group is a combined seal with a guide ring and a retainer ring.

Furthermore, the first-stage piston is correspondingly connected with the first-stage piston rod, the second-stage piston is correspondingly connected with the second-stage piston rod, a first-stage rod cavity is formed between the outer wall of the first-stage piston rod and the inner wall of the cylinder body, and a second-stage rod cavity is formed between the outer wall of the second-stage piston rod and the inner wall of the first-stage piston rod.

Furthermore, the first-stage rod cavity is communicated with the second-stage rod cavity through an oil duct arranged on the first-stage piston rod.

Furthermore, outlets at two ends of the oil duct are respectively a primary oil port and a secondary oil port, and the primary oil port is arranged close to the primary piston and communicated with the primary rod cavity; the second-stage oil port is far away from the first-stage piston and communicated with the second-stage rod cavity.

Compared with the prior art, the utility model has the following beneficial effects:

1. the connecting part of the piston and the piston rod is provided with the steel ball which is limited in the arc groove of the piston rod by the screw on the piston, so that the relative axial movement of the piston and the piston rod can be limited, the mode is simple and convenient to install, the anti-loosening performance is good, the oil leakage phenomenon caused by loose connection between the piston and the piston rod of the hydraulic cylinder in a high-pressure working environment can be improved, the thrust loss of the hydraulic cylinder is reduced, and the normal operation of the hydraulic cylinder is ensured; meanwhile, the abrasion between the piston and the piston rod can be reduced, and the service life of the hydraulic cylinder is prolonged.

2. A supporting ring is arranged above the screw for limiting the steel balls, the supporting ring can prevent the screw from loosening, and the steel balls are ensured to be always positioned in the circular arc grooves, so that the piston and the piston rod are always kept connected tightly; meanwhile, the abrasion between the piston and the piston rod can be reduced, and the maintenance and replacement period of the piston is prolonged.

3. The abutting seat is arranged at the end of the primary piston, and can prevent the secondary piston from directly impacting the primary piston when the hydraulic cylinder retracts, so that the abrasion of the primary piston and the secondary piston is increased, and the maintenance and the replacement are frequent; the support seat is connected with the first-stage piston through threads, the structure is simple, the assembly and disassembly are convenient, and meanwhile, thread anti-loosening glue is arranged at the threaded connection position of the support seat and the first-stage piston, so that the support seat can not generate obvious axial movement in long-term collision with the second-stage piston, and the working stability of the hydraulic cylinder can be improved.

4. The sealing group is arranged between the guide sleeve and the piston rod, so that the sealing property in the hydraulic cylinder can be improved, hydraulic oil is prevented from leaking, the friction resistance of the piston rod in the stretching process can be reduced, the working load of the hydraulic cylinder is reduced, and the service life of the hydraulic cylinder is prolonged; the sealing group adopts combined sealing with a guide ring 9 and a retainer ring 10, has good sealing performance and can also play a role of guide support.

5. The one-level has pole chamber and second grade to have the pole chamber to communicate through the oil duct that sets up on one-level piston rod, and the one-level hydraulic fluid port that communicates the one-level to have the pole chamber is close to the position setting of one-level piston, and the earphone that communicates the second grade to have the pole chamber has the position setting of mouthful keeping away from one-level piston, can guarantee to have the pole chamber to cross oily going on smoothly, and the flexible order of accurate control piston rod avoids appearing the condition that the inside fluid of pneumatic cylinder blockked up.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention.

Wherein, 1-a piston; 1.1-primary piston; 1.2-secondary piston; 2-a piston rod; 2.1-first-level piston rod; 2.2-a secondary piston rod; 3-steel balls; 4-arc groove; 5-a screw; 6-a support ring; 7-abutting against the seat; 8, a guide sleeve; 9-a guide ring; 10-a retainer ring; 11-first stage rod cavity; 12-a secondary rod cavity; 13-an oil duct; 14-a first-stage oil port; 15-secondary oil port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Example 1

The anti-loosening hydraulic cylinder shown in the figure 1 comprises a piston 1 and a piston rod 2 correspondingly connected with the piston 1, and is characterized in that a steel ball 3 is arranged on the connecting surface of the piston 1 and the piston rod 2, an arc groove 4 matched with the steel ball 3 is arranged on the piston rod 2, a threaded hole for mounting the steel ball 3 is formed in the piston, and a screw 5 is arranged in the threaded hole to limit the steel ball 3 in the arc groove 4.

The connecting part of the piston 1 and the piston rod 2 is provided with the steel ball 3, the steel ball 3 is limited in the arc groove 4 of the piston rod 2 by the screw 5 on the piston 1, and further the relative axial movement of the piston 1 and the piston rod 2 can be limited, the mode has simple and convenient installation and good anti-loosening performance, can improve the oil leakage phenomenon caused by the loose connection between the piston 1 and the piston rod 2 in a high-pressure working environment, reduce the thrust loss of the hydraulic cylinder and ensure the normal operation of the hydraulic cylinder; meanwhile, the abrasion between the piston 1 and the piston rod 2 can be reduced, and the service life of the hydraulic cylinder is prolonged.

A supporting ring 6 is arranged above the screw 5, the supporting ring 6 can prevent the screw 5 from loosening, and the steel ball 3 is ensured to be always positioned in the arc groove 4, so that the piston 1 and the piston rod 2 are always kept connected tightly; meanwhile, the abrasion between the piston 1 and the piston rod 2 can be reduced, and the maintenance and replacement period is prolonged.

Specifically, the piston 1 comprises a primary piston 1.1 and a secondary piston 1.2, the primary piston 1.1 is provided with a supporting seat 7 for limiting the stroke of the secondary piston 1.2, and the supporting seat 7 can prevent the secondary piston 1.2 from directly impacting the primary piston 1.1 when the hydraulic cylinder retracts, so that the abrasion between the primary piston and the secondary piston is increased, and the maintenance and the replacement are frequent.

The abutting seat 7 is annular, and the abutting seat 7 is connected with the primary piston 1.1 through threads, so that the structure is simple and the assembly and disassembly are convenient; the threaded connection part of the abutting seat 7 and the primary piston 1.1 is provided with thread anti-loose glue, so that the abutting seat 7 can not generate obvious axial movement in long-term collision with the secondary piston, and the working stability of the hydraulic cylinder can be improved.

The hydraulic cylinder is characterized by further comprising a guide sleeve 8, the piston rod 2 is sleeved in the guide sleeve 8, and a sealing group is arranged between the guide sleeve 8 and the piston rod 2, so that the sealing performance in the hydraulic cylinder can be improved, hydraulic oil is prevented from leaking, meanwhile, the friction resistance of the piston rod 2 in the expansion process can be reduced, the work load of the hydraulic cylinder is reduced, and the service life of the hydraulic cylinder is prolonged; the sealing group adopts combined sealing with a guide ring 9 and a retainer ring 10, has good sealing performance and can also play a role of guide support.

The primary piston 1.1 and the primary piston rod 2.1 are integrally formed, the secondary piston 1.2 and the secondary piston rod 2.2 are connected through threads, a primary rod cavity 11 is formed between the outer wall of the primary piston rod 2.1 and the inner wall of the cylinder body, and a secondary rod cavity 12 is formed between the outer wall of the secondary piston rod 2.2 and the inner wall of the primary piston rod 2.1; the primary rod cavity 11 is communicated with the secondary rod cavity 12 through an oil passage 13 arranged on the primary piston rod 2.1.

Outlets at two ends of the oil duct 13 are respectively a primary oil port 14 and a secondary oil port 15, and the primary oil port 14 is arranged close to the primary piston 1.1 and communicated with the primary rod cavity 11; the secondary oil port 15 is far away from the primary piston 1.1, the secondary is communicated with the rod cavity 12, smooth oil passing through the rod cavity can be guaranteed due to the structural design, the telescopic sequence of the piston rod 2 is accurately controlled, and the situation that oil liquid inside the hydraulic cylinder is blocked is avoided.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a locking pneumatic cylinder, includes piston (1), corresponds piston rod (2) of being connected with piston (1), its characterized in that, be equipped with a steel ball (3) on the face of being connected of piston (1) and piston rod (2), be equipped with on piston rod (2) with circular arc groove (4) of steel ball (3) looks adaptation, be equipped with on the piston and be used for the installation the screw hole of steel ball (3), threaded hole is equipped with screw (5) and restricts steel ball (3) in circular arc groove (4).

2. Anti-loose hydraulic cylinder according to claim 1, characterized in that a support ring (6) is provided above the screw (5).

3. Anti-loosening hydraulic cylinder according to claim 1, characterized in that the piston (1) comprises a primary piston (1.1) and a secondary piston (1.2), and the primary piston (1.1) is provided with a support seat (7) for limiting the stroke of the secondary piston (1.2).

4. The anti-loosening hydraulic cylinder according to claim 3, wherein the abutting seat (7) is annular, and the abutting seat (7) is in threaded connection with the primary piston (1.1).

5. The anti-loosening hydraulic cylinder according to claim 4, wherein a threaded connection part of the abutting seat (7) and the primary piston (1.1) is provided with a threaded anti-loosening glue.

6. The anti-loosening hydraulic cylinder according to claim 1, characterized by further comprising a guide sleeve (8), wherein the piston rod (2) is sleeved in the guide sleeve (8), and a sealing group is arranged between the guide sleeve (8) and the piston rod (2).

7. Anti-loose hydraulic cylinder according to claim 6, characterized in that the sealing group is a combined seal with a guide ring (9) and a retainer ring (10).

8. The anti-loosening hydraulic cylinder according to claim 3, wherein the primary piston (1.1) is correspondingly connected with the primary piston rod (2.1), the secondary piston (1.2) is correspondingly connected with the secondary piston rod (2.2), a primary rod cavity (11) is formed between the outer wall of the primary piston rod (2.1) and the inner wall of the cylinder body, and a secondary rod cavity (12) is formed between the outer wall of the secondary piston rod (2.2) and the inner wall of the primary piston rod (2.1).

9. Anti-loosening hydraulic cylinder according to claim 8, characterized in that the primary rod chamber (11) and the secondary rod chamber (12) are communicated through an oil channel (13) provided on the primary piston rod (2.1).

10. The anti-loosening hydraulic cylinder according to claim 9, wherein outlets at two ends of the oil duct (13) are a primary oil port (14) and a secondary oil port (15), and the primary oil port (14) is arranged close to the primary piston (1.1) and communicated with the primary rod cavity (11); the second-stage oil port (15) is far away from the first-stage piston (1.1) and communicated with the second-stage rod cavity (12).