Heavy-load self-locking hydraulic device

Abstract

The invention belongs to hydraulic devices, and particularly relates to a heavy-load self-locking hydraulic device. The heavy-load self-locking hydraulic device comprises a barrel, a front cover and a rear cover are arranged at the front end and the rear end of the barrel respectively, a piston rod is arranged in the barrel, and a locking device is connected to the piston rod in a sleeved mode. The in-cylinder self-locking hydraulic oil cylinder provided by the invention has the obvious effect that the accurate locking of the hydraulic oil cylinder at any position in the whole stroke can be realized. According to the wedge-shaped braking mechanism researched and designed by the invention, braking can be realized by using relatively low oil pressure, and relatively high load can be borne.

Description

Technical Field

[0001] The invention belongs to a hydraulic device, and in particular relates to a heavy-load self-locking hydraulic device. Background Art

[0002] Hydraulic cylinder is a common hydraulic actuator, which is widely used in all walks of life. It is difficult to avoid leakage in the hydraulic system, which causes slight displacement changes in the piston rod, and ultimately makes it difficult for the hydraulic cylinder to keep the piston position unchanged for a long time under the load. With the advancement of science and technology, cylinders are increasingly used in high-precision occasions, and leakage in the cylinder causes the displacement of the cylinder to fail to reach the displacement required for precision operation. At present, a mechanical self-locking mechanism is usually added to the hydraulic cylinder to enhance the reliability of the hydraulic cylinder locking, but most of the existing mechanical self-locking mechanisms can only achieve locking when the piston rod is fully extended or retracted, and cannot achieve locking of the hydraulic cylinder at any position in the full stroke. In order to solve the above problems, it is necessary to develop a self-locking hydraulic cylinder structure to achieve rapid braking at any position and increase the reliability, stability and accuracy of braking. Summary of the invention

[0003] The present invention aims at the defects of the prior art and provides a large-load self-locking hydraulic device.

[0004] The present invention is implemented as follows: a large-load self-locking hydraulic device, which includes a cylinder, a front cover and a rear cover are respectively arranged at the front and rear ends of the cylinder, a piston rod is arranged in the cylinder, and a locking device is sleeved on the piston rod.

[0005] A large-load self-locking hydraulic device as described above, wherein the tightening device includes a rear guide sleeve, a locking piston, a locking block, a locking pressure gasket, an unlocking piston and a front guide sleeve which are sleeved on the piston rod and arranged in sequence from back to front.

[0006] In the heavy-load self-locking hydraulic device as described above, a fixing block is further arranged between the locking piston and the locking block.

[0007] A large-load self-locking hydraulic device as described above, wherein the piston rod is installed inside the cylinder body, its telescopic guide is controlled by the front guide sleeve and the rear guide sleeve, and the oil seal installed on the front guide sleeve and the rear guide sleeve seals the oil between the piston rod and the cylinder body.

[0008] As described above, a large-load self-locking hydraulic device, wherein the rear cover surface is provided with a rodless chamber oil inlet hole, and the cylinder surface is provided with a rod chamber oil inlet hole, which are respectively connected to the rodless chamber and the rod chamber, and the telescopic movement of the piston rod is controlled by the oil inlet pressure.

[0009] In the heavy-load self-locking hydraulic device as described above, a locking oil hole and an unlocking oil hole are also provided on the surface of the cylinder, which are respectively connected to the locking chamber and the unlocking chamber.

[0010] In the heavy-load self-locking hydraulic device as described above, the outer surface of the locking block is embedded in the track groove of the fixing block, and the movement guide of the locking block is controlled by the fixing block.

[0011] The significant effect of the present invention is that the self-locking hydraulic cylinder provided by the present invention can realize accurate locking of the hydraulic cylinder at any position in the full stroke. The wedge-shaped brake mechanism developed and designed by the present invention can realize braking with lower oil pressure and can withstand larger loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Axonometric drawing of heavy load self-locking hydraulic cylinder

[0013] Figure 2 Cross-sectional view of a heavy load self-locking hydraulic cylinder

[0014] In the figure: 1. front cover; 2. front guide sleeve; 3. unlocking piston; 4. piston rod; 5. locking pressure gasket; 6. locking block; 7. fixing block; 8. cylinder; 9. locking piston; 10. rear guide sleeve; 11. rear cover. DETAILED DESCRIPTION

[0015] A large-load self-locking hydraulic device is mainly composed of a piston rod 4, a cylinder 8, a locking block 6, a locking piston 9 and an unlocking piston 3. The piston rod 4 is installed inside the cylinder 8, and its telescopic guide is controlled by the front guide sleeve 2 and the rear guide sleeve 10, and the oil seal installed on the front guide sleeve 2 and the rear guide sleeve 10 seals the oil between the piston rod 4 and the cylinder 8.

[0016] The main function of the brake mechanism is to lock the piston rod 4 at any position in its stroke, so that it can withstand higher loads and prevent the displacement of the cylinder caused by internal leakage. The surface of the rear cover 11 is provided with an oil inlet hole for the rodless chamber, and the surface of the cylinder 8 is provided with an oil inlet hole for the rod chamber, which are respectively connected to the rodless chamber and the rod chamber, and the telescopic movement of the piston rod 4 is controlled by the oil inlet pressure. The surface of the cylinder 8 is also provided with a locking oil hole and an unlocking oil hole, which are respectively connected to the locking chamber and the unlocking chamber. The outer surface of the locking block 6 is embedded in the track groove of the fixed block 7, and the movement guide of the locking block 6 is controlled by the fixed block 7.

[0017] Working process and principle of hydraulic device: The inner surface of locking block 6 is embedded in the oblique key groove of piston rod 4. When piston rod 4 moves to the target position, pressure oil is introduced into the locking oil hole, and the pressure pushes locking piston 9 to move in the direction of piston rod 4 extending, and locking piston 9 pushes locking block 6 to move in the direction of piston rod 4 extending. Since the oblique key groove on piston rod 4 has a certain inclination angle, the radial space gradually decreases, and radial force is applied to piston rod 4 when locking block 6 gradually extends, and locking is achieved by self-locking by friction. When piston rod 4 ends braking and is ready to continue moving, pressure oil is introduced into the unlocking oil hole, and the pressure pushes unlocking piston 3 to move in the direction of piston rod 4 retracting, and unlocking piston 3 pushes locking block 6 to move in the direction of piston rod 4 retracting. The oblique key groove on piston rod 4 has a certain inclination angle, and the radial space gradually increases. When locking block 6 gradually retracts, the radial force on piston rod 4 disappears, and unlocking is achieved.

[0018] The fixing block 7 is fixed to the inner side of the cylinder 8 and is used to control the telescopic guide of the locking block 6 and cooperate with the oblique key groove on the surface of the piston rod 4 to realize the braking and unlocking of the piston rod 4.

[0019] During the equipment adjustment welding process, 8 sets of hydraulic devices were used to support and adjust the 8 pipe seats of the equipment. The 8 hydraulic devices were used to accurately adjust each pipe seat of the equipment to ensure the horizontality of the equipment sealing surface and the assembly gap between the equipment and the support. During the welding process of the equipment and the support, the stress conditions of each pipe seat of the equipment were monitored in real time, and precise fine-tuning and automatic locking were performed through hydraulic devices to adjust the stress of the weld part. Finally, while ensuring the quality of the weld, the horizontality of the equipment installation was effectively controlled, and the equipment installation adjustment welding work was successfully completed.

Claims

1. A large load self-locking hydraulic device, characterized in that: The invention comprises a cylinder (8), a front cover (1) and a rear cover (11) are respectively arranged at the front and rear ends of the cylinder (8), a piston rod (4) is arranged in the cylinder, and a locking device is sleeved on the piston rod (4).

2. A large-load self-locking hydraulic device as claimed in claim 1, characterized in that: The tightening device comprises a rear guide sleeve (10) sleeved on a piston rod (4), a locking piston (9), a locking block (6), a locking pressure washer (5), an unlocking piston (3) and a front guide sleeve (2) which are arranged in sequence from back to front.

3. A large-load self-locking hydraulic device as claimed in claim 2, characterized in that: A fixing block (7) is also arranged between the locking piston (9) and the locking block (6).

4. A large-load self-locking hydraulic device as claimed in claim 3, characterized in that: The piston rod (4) is installed inside the cylinder (8), and its telescopic guidance is controlled by the front guide sleeve (2) and the rear guide sleeve (10), and the oil seals installed on the front guide sleeve (2) and the rear guide sleeve (10) seal the oil between the piston rod (4) and the cylinder (8).

5. A large-load self-locking hydraulic device as claimed in claim 4, characterized in that: The surface of the rear cover (11) is provided with a rodless chamber oil inlet hole, and the surface of the cylinder (8) is provided with a rod chamber oil inlet hole, which are respectively connected to the rodless chamber and the rod chamber, and the telescopic movement of the piston rod (4) is controlled by the oil inlet pressure.

6. A heavy load self-locking hydraulic device as claimed in claim 5, characterized in that: The surface of the cylinder (8) is also provided with a locking oil hole and an unlocking oil hole, which are respectively connected with the locking cavity and the unlocking cavity.

7. A heavy-load self-locking hydraulic device as claimed in claim 6, characterized in that: The outer surface of the locking block (6) is embedded in the track groove of the fixing block (7), and the movement guide of the locking block (6) is controlled by the fixing block (7).

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