Sealing assembly anti-shearing type hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a sealing assembly anti-shearing type hydraulic oil cylinder which comprises an oil cylinder, a cylinder cover, a cylinder bottom and a sealing assembly. A cylinder cover is fixedly arranged above the oil cylinder, a cylinder bottom is fixedly arranged below the oil cylinder, and the sealing assembly is arranged in the oil cylinder. A fixing rod is arranged between the cylinder cover and the cylinder bottom, the two ends of the fixing rod are in threaded connection with the first nuts, and an oil inlet and an oil outlet are formed in the outer side walls of the upper side and the lower side of the oil cylinder in a communicating mode correspondingly. By arranging multiple layers of sealing devices and multiple sealing layers for cooperative use, pressure leakage in the movement process of the hydraulic oil cylinder is avoided, meanwhile, the phenomenon of slow oil seepage of the oil cylinder caused by long-time use is avoided, the service life of the hydraulic oil cylinder is prolonged, the shear resistance of the hydraulic oil cylinder is enhanced through the fixing rods arranged at the upper end and the lower end of the hydraulic oil cylinder, and the service life of the hydraulic oil cylinder is prolonged. And the reinforcing and protecting effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a sealed assembly anti-shear type hydraulic oil cylinder. Background Art

[0002] The Chinese patent document currently announced as CN220470363U discloses a sealed and assembled anti-shear hydraulic cylinder, which proposes that a piston rod is slidably installed inside the outer shell, a circular ring is installed at the connection part of the outer shell and the piston rod, a cylinder for placing lubricating oil is installed on the outer edge surface of the circular ring, a through hole connecting the cylinder and the outer edge surface of the piston rod is opened on the circular ring, and an L-shaped plate for opening and closing the through hole is elastically installed inside the circular ring. Through the circular ring, through hole, first spring, piston rod, cylinder, L-shaped plate and through hole, when the outer edge surface of the piston rod begins to roughen, the friction between the piston rod and the L-shaped plate becomes greater, and then drives the L-shaped plate to move, so that the circular hole and the through hole coincide, and the lubricating oil is introduced into the outer edge surface of the piston rod through the through hole. The addition of lubricating oil is completed by rotating and pulling the piston rod, which can avoid oxidation on the surface of the piston rod and facilitate the addition of lubricating oil.

[0003] In the above scheme and the existing technology, when the hydraulic cylinder is working, the piston rod moves up and down under the drive of oil pressure, and the outer wall of the piston rod will stick to the oil and carry it out of the hydraulic cylinder. Long-term oil leakage will make the air tightness inside the hydraulic cylinder poor, affecting the service life of the hydraulic cylinder and failing to meet actual use requirements. Utility Model Content

[0004] The purpose of the utility model is to provide a sealed assembly anti-shear type hydraulic cylinder to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealed assembly anti-shear hydraulic oil cylinder, comprising an oil cylinder, a cylinder cover, a cylinder bottom and a sealing assembly;

[0006] A cylinder cover is fixedly provided above the oil cylinder, a cylinder bottom is fixedly provided below the oil cylinder, and a sealing assembly is provided in the oil cylinder;

[0007] A fixing rod is provided between the cylinder cover and the cylinder bottom, and both ends of the fixing rod are threadedly connected to the first nut, and an oil inlet and an oil outlet are respectively provided on the upper and lower outer side walls of the oil cylinder.

[0008] Preferably, the sealing assembly includes a piston rod and a piston; one end of the piston rod is movably inserted into the oil cylinder, and a piston is provided on the outer side wall of one end of the piston rod in the oil cylinder, and the bottom end of the piston rod is threadedly connected to the second nut.

[0009] Preferably, the inner wall of the oil cylinder is fitted with a first sealing layer, the bottom end of the piston is provided with a second sealing layer, and the inner bottom end of the oil cylinder is provided with a third sealing layer, and the third sealing layer is provided with a connecting groove adapted to the two nuts.

[0010] Preferably, a sealing groove is fixedly provided on the inner wall of the oil cylinder, and a fourth sealing layer is adaptively connected in the sealing groove, and a sealing ring is provided at the bottom end of the fourth sealing layer, and the sealing ring is adaptively connected to the piston rod, and the bottom of the sealing ring is provided with a chamfer.

[0011] Preferably, a limiting ring is provided below the fourth sealing layer in the oil cylinder, and connecting holes are fixedly provided on the limiting ring at equal intervals, and a movable hole adapted to the piston rod is provided at the center of the limiting ring, and a sealing gasket is provided in the movable hole.

[0012] Preferably, a sealing seat adapted to the piston rod is provided on the cylinder cover on the upper end surface of the oil cylinder.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model proposes a sealed and shear-proof hydraulic cylinder, which prevents pressure leakage during the movement of the hydraulic cylinder by arranging a multi-layer sealing device and using multiple sealing layers in combination. At the same time, it also prevents the occurrence of slow oil leakage in the cylinder due to long-term use, thereby extending the service life of the hydraulic cylinder. The fixing rods arranged at the upper and lower ends of the hydraulic cylinder enhance the shear resistance of the hydraulic cylinder, thereby playing a role of reinforcement and protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the hydraulic cylinder of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the fourth sealing layer of the utility model;

[0018] Figure 4 This is a schematic diagram of the limit ring structure of the utility model.

[0019] In the figure: oil cylinder 1, cylinder head 2, cylinder bottom 3, fixing rod 4, first nut 5, oil inlet 6, oil outlet 7, piston rod 8, piston 9, first sealing layer 10, second sealing layer 11, third sealing layer 12, second nut 13, sealing seat 14, sealing groove 15, fourth sealing layer 16, sealing ring 17, limit ring 18, connecting hole 19, sealing gasket 20. DETAILED DESCRIPTION

[0020] In order to clearly and completely describe the purpose and technical solution of the present invention and make its advantages more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figures 1 to 4 , this utility model provides three technical solutions:

[0022] Example 1: A sealed assembly anti-shear hydraulic cylinder, comprising a cylinder 1, a cylinder cover 2, a cylinder bottom 3 and a sealing assembly;

[0023] A cylinder head 2 is fixedly installed above the oil cylinder 1, and a cylinder bottom 3 is fixedly installed below the oil cylinder 1. A sealing assembly is arranged in the oil cylinder 1. The oil cylinder 1 is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion);

[0024] A fixing rod 4 is provided between the cylinder cover 2 and the cylinder bottom 3, and both ends of the fixing rod 4 are threadedly connected to the first nut 5. The fixing rods 4 arranged at the upper and lower ends of the hydraulic cylinder enhance the shear resistance of the hydraulic cylinder and play a role in reinforcement and protection. The upper and lower outer walls of the cylinder 1 are respectively provided with an oil inlet 6 and an oil outlet 7.

[0025] Example 2: Based on Example 1, one end of the piston rod 8 is movably inserted into the oil cylinder 1, and a piston 9 is provided on the outer side wall of one end of the piston rod 8 in the oil cylinder 1, and the bottom end of the piston rod 8 is threadedly connected to the second nut 13. The threaded connection between the second nut 13 and the piston rod 8 facilitates the assembly and replacement of the piston rod 8.

[0026] A first sealing layer 10 is fitted on the inner wall of the oil cylinder 1, a second sealing layer 11 is provided at the bottom end of the piston 9, and a third sealing layer 12 is provided at the inner bottom end of the oil cylinder 1, and a connecting groove adapted to the second nut 13 is provided on the third sealing layer 12. The first sealing layer 10, the second sealing layer 11 and the third sealing layer 12 can enhance the sealing between the components and avoid oil leakage.

[0027] Example 3: On the basis of Example 2, a sealing groove 15 is fixedly provided on the inner wall of the oil cylinder 1, and a fourth sealing layer 16 is adaptively connected to the sealing groove 15, and a sealing ring 17 is provided at the bottom end of the fourth sealing layer 16, and the sealing ring 17 is adaptively connected to the piston rod 8, and the bottom of the sealing ring 17 is provided with a chamfer. The chamfer at the bottom of the sealing ring 17 can help to scrape off the oil on the outer wall of the piston rod 8, thereby avoiding the phenomenon of slow oil leakage in the oil cylinder caused by long-term use.

[0028] A limit ring 18 is provided below the fourth sealing layer 16 in the oil cylinder 1, and connection holes 19 are fixedly provided on the limit ring 18 at equal intervals. A movable hole adapted to the piston rod 8 is provided at the center of the limit ring 18, and a sealing gasket 20 is provided in the movable hole.

[0029] A sealing seat 14 adapted to the piston rod 8 is provided on the cylinder cover 2 at the upper end surface of the oil cylinder 1 .

[0030] During use, the fixing rod 4 arranged between the cylinder cover 2 and the cylinder bottom 3 at the upper and lower ends of the cylinder 1 is threadedly connected to the first nut 5 to facilitate assembly and replacement of the fixing rod 4. The piston 9 is driven to move on the inner wall of the cylinder 1 through the oil inlet 6 and the oil outlet 7. The second sealing layer 11 at the bottom end of the piston 9 and the first sealing layer 10 on the inner wall of the cylinder 1 and the sealing layer 12 at the inner bottom end of the cylinder 1 can buffer the collision between the piston 9 and the upper and lower inner walls of the cylinder 1. The fourth sealing layer 16, sealing ring 17 and limit ring 18 can enhance the sealing between the components to avoid oil leakage.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed assembly anti-shear hydraulic cylinder, characterized by: It comprises an oil cylinder (1), a cylinder cover (2), a cylinder bottom (3) and a sealing assembly; A cylinder cover (2) is fixedly provided above the oil cylinder (1), and a cylinder bottom (3) is fixedly provided below the oil cylinder (1), and a sealing assembly is provided in the oil cylinder (1); A fixing rod (4) is provided between the cylinder cover (2) and the cylinder bottom (3), and both ends of the fixing rod (4) are threadedly connected to the first nut (5), and an oil inlet (6) and an oil outlet (7) are respectively provided on the upper and lower outer side walls of the oil cylinder (1); The sealing assembly comprises a piston rod (8) and a piston (9); one end of the piston rod (8) is movably inserted into the oil cylinder (1), and a piston (9) is provided on the outer side wall of one end of the piston rod (8) and the bottom end of the piston rod (8) is threadedly connected to the second nut (13); The inner wall of the oil cylinder (1) is provided with a first sealing layer (10), the bottom end of the piston (9) is provided with a second sealing layer (11), the inner bottom end of the oil cylinder (1) is provided with a third sealing layer (12), and the third sealing layer (12) is provided with a connecting groove adapted to the second nut (13); A sealing groove (15) is fixedly provided on the inner side wall of the oil cylinder (1), and a fourth sealing layer (16) is adaptively connected and provided in the sealing groove (15), and a sealing ring (17) is provided at the bottom end of the fourth sealing layer (16), and the sealing ring (17) is adaptively connected to the piston rod (8), and the bottom of the sealing ring (17) is provided with a chamfer.

2. A sealed assembly anti-shear hydraulic cylinder according to claim 1, characterized in that: A limiting ring (18) is provided below the fourth sealing layer (16) in the oil cylinder (1), and connecting holes (19) are fixedly provided on the limiting ring (18) at equal intervals. A movable hole adapted to the piston rod (8) is provided at the center of the limiting ring (18), and a sealing gasket (20) is provided in the movable hole.

3. The sealed assembly anti-shear hydraulic cylinder according to claim 1, characterized in that: A sealing seat (14) adapted to the piston rod (8) is provided on the cylinder cover (2) on the upper end surface of the oil cylinder (1).

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