A stable bidirectional hydraulic cylinder

Abstract

The utility model discloses a stable bidirectional hydraulic cylinder, comprising a piston rod, a cylinder body, and end covers arranged on both sides of the cylinder body, both ends of the piston rod extend out of the end covers, the piston rod is connected to a piston, the piston is movably mounted on the cylinder body, a first oil inlet and a first oil outlet are arranged on one side of the cylinder body, a second oil inlet and a second oil outlet are arranged on the other side of the cylinder body, the first oil inlet, the first oil outlet, the second oil inlet, and the second oil outlet are all connected to the cylinder body; wherein, an outer convex portion is arranged on one side of the end cover, and the outer convex portion is connected to an isolating member. The first oil inlet, the first oil outlet, the second oil inlet, and the second oil outlet control the movement of the piston by the inlet and outlet of oil, thereby controlling the movement of the piston rod and realizing bidirectional output power, and the outer convex portion of the end cover and the isolating member are used to prevent external impurities from entering the cylinder body, polluting the oil inside the cylinder body, or even jamming the piston rod.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a stable bidirectional hydraulic cylinder. Background Art

[0002] A bidirectional hydraulic cylinder is a mechanical device that can generate bidirectional force. Its main function is to convert hydraulic energy into mechanical energy and perform linear reciprocating motion (or swinging motion) as a hydraulic actuator. A bidirectional hydraulic cylinder generally includes a cylinder body, a piston, and a piston rod.

[0003] Both ends of the existing bidirectional hydraulic cylinder extend out of the cylinder body, and only a dust ring is used to prevent external impurities from entering the cylinder body. The stability is poor and the hydraulic cylinder is easily jammed by external impurities. Utility Model Content

[0004] The technical problem to be solved by the utility model is: the utility model provides a stable bidirectional hydraulic cylinder to solve the problem of poor stability.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a stable bidirectional hydraulic cylinder, comprising a piston rod, a cylinder body, and end covers respectively arranged on both sides of the cylinder body, both ends of the piston rod extend out of the end covers, the piston rod is connected with a piston, and the piston is movably installed on the cylinder body, one side of the cylinder body is provided with a first oil inlet and a first oil outlet, and the other side of the cylinder body is provided with a second oil inlet and a second oil outlet, and the first oil inlet, the first oil outlet, the second oil inlet, and the second oil outlet are all connected to the cylinder body;

[0006] Wherein, an outer protrusion is provided on one side of the end cover, and the outer protrusion is connected to an isolating piece.

[0007] The beneficial effects of the utility model are as follows: the first oil inlet, the first oil outlet, the second oil inlet and the second oil outlet control the movement of the piston by the inlet and outlet of oil, thereby controlling the movement of the piston rod and realizing two-way output power; the outer convex part of the end cover and the isolating part are used to prevent external impurities from entering the cylinder body, contaminating the oil inside the cylinder body or even jamming the piston rod.

[0008] Preferably, the isolating member comprises an isolating sleeve screwed to the outer protrusion, the isolating sleeve is provided with a plurality of first elastic sheets at intervals along the circumferential direction, one end of the first elastic sheet is connected to the isolating sleeve, and the other end of the first elastic sheet abuts against the piston rod.

[0009] Preferably, the isolation sleeve is provided with a stepped portion, the stepped portion includes a first step surface and a second step surface, the first spring sheet is arranged on the first step surface, a plurality of second spring sheets are arranged at circumferential intervals on the second step surface, one end of the second spring sheet is connected to the second step surface, the other end of the second spring sheet abuts the piston rod, and the second spring sheet is staggered with the first spring sheet.

[0010] Preferably, a plurality of O-rings are provided between the end cover and the cylinder body.

[0011] Preferably, both ends of the piston rod are provided with connecting parts.

[0012] Preferably, a guide belt, a sealing ring and a dust ring are sequentially arranged between the cylinder body and the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of a stable bidirectional hydraulic cylinder;

[0014] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0015] Figure 3 It is a cross-sectional view of a stable bidirectional hydraulic cylinder;

[0016] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0017] In the figure: 1. piston rod; 2. cylinder body; 3. second oil inlet; 4. second oil outlet; 5. connecting part; 6. isolation sleeve; 7. first spring piece; 8. first oil inlet; 9. first oil outlet; 10. piston; 11. second spring piece; 12. outer protrusion; 13. O-ring; 14. end cover; 15. dust ring; 16. sealing ring; 17. guide belt. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0020] Example

[0021] like Figure 1-4 As shown, a stable bidirectional hydraulic cylinder includes a piston rod 1, a cylinder body 2, and end covers 14 arranged on both sides of the cylinder body 2, both ends of the piston rod 1 extend out of the end covers 14, the piston rod 1 is connected to a piston 10, and the piston 10 is movably installed on the cylinder body 2, one side of the cylinder body 2 is provided with a first oil inlet 8 and a first oil outlet 9, and the other side of the cylinder body 2 is provided with a second oil inlet 3 and a second oil outlet 4, the first oil inlet 8, the first oil outlet 9, the second oil inlet 3, and the second oil outlet 4 are all connected to the cylinder body 2; wherein, one side of the end cover 14 is provided with an outer protrusion 12, and the outer protrusion 12 is connected with an isolation piece.

[0022] Specifically, the first oil inlet 8, the first oil outlet 9, the second oil inlet 3, and the second oil outlet 4 control the movement of the piston 10 by the inlet and outlet of oil, thereby controlling the movement of the piston rod 1 to achieve two-way output power. The outer protrusion 12 of the end cover 14 and the isolation piece are used to prevent external impurities from entering the cylinder body 2, contaminating the oil inside the cylinder body 2 or even jamming the piston rod 1.

[0023] The applicant needs to emphasize that the structure of the oil circuit of the hydraulic cylinder is regarded as a mature prior art, which at least includes a hydraulic station and corresponding connecting pipes and connecting valve bodies, and its specific structure will not be elaborated in detail here.

[0024] Furthermore, the isolation member includes an isolation sleeve 6 screwed to the outer protrusion 12, and the isolation sleeve 6 is provided with a plurality of first spring pieces 7 at intervals along the circumferential direction. One end of the first spring piece 7 is connected to the isolation sleeve 6, and the other end of the first spring piece 7 abuts against the piston rod 1. The first spring piece 7 prevents external impurities from entering the cylinder body 2 by abutting the end face of one end against the piston rod 1. Moreover, when the piston rod 1 is retracted, if impurities are stuck between the first spring piece 7 and the piston rod 1 and cannot be removed, the first spring piece 7 can bend and deform to prevent the impurities from blocking the piston rod 1. Correspondingly, when the piston rod 1 is extended, the first spring piece 7 can bend and deform so that the impurities stuck between the first spring piece 7 and the piston rod 1 can be smoothly removed.

[0025] Furthermore, the isolation sleeve 6 is provided with a stepped portion, which includes a first step surface and a second step surface. The first spring piece 7 is arranged on the first step surface, and a plurality of second spring pieces 11 are arranged at circumferential intervals on the second step surface. One end of the second spring piece 11 is connected to the second step surface, and the other end of the second spring piece 11 abuts the piston rod 1. The second spring piece 11 is staggered with the first spring piece 7. The second spring piece 11 is staggered with the first spring piece 7 in the circumferential direction. In order to prevent impurities from entering the cylinder body 2 through the gap between the first spring pieces, and because the first spring piece 7 needs to have a deformation space, a gap must be set. The second spring piece 11 is used to make up for the gap and to a certain extent acts as an insurance, thereby providing double protection for the cylinder body 2.

[0026] Furthermore, a plurality of O-rings 13 are provided between the end cover 14 and the cylinder body 2 , and the O-rings 13 are used for sealing.

[0027] Furthermore, both ends of the piston rod 1 are provided with connecting parts 5, and the connecting parts 5 are used to connect external loads.

[0028] Furthermore, a guide belt 17, a sealing ring 16, and a dust ring 15 are sequentially arranged between the cylinder body 2 and the end cover 14. The guide belt 17 is used to guide the piston rod 1, and the sealing ring 16 is used for sealing. The sealing ring 16 is preferably one or a combination of a YX-d ring and a BSJ step seal. The dust ring 15 is used for dust prevention, and the dust ring 15 is preferably a J-type dust ring. The dust ring 15 is located on the side away from the inside of the cylinder body 2, the guide belt 17 is located on the side close to the inside of the cylinder body 8, and the sealing ring 16 is located between the dust ring 15 and the guide belt 17.

[0029] The above-mentioned technical features can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A stable bidirectional hydraulic cylinder, characterized in that: It comprises a piston rod (1), a cylinder body (2), and end covers (14) arranged on both sides of the cylinder body (2), both ends of the piston rod (1) extend out of the end covers (14), the piston rod (1) is connected to a piston (10), the piston (10) is movably mounted on the cylinder body (2), one side of the cylinder body (2) is provided with a first oil inlet (8) and a first oil outlet (9), the other side of the cylinder body (2) is provided with a second oil inlet (3) and a second oil outlet (4), the first oil inlet (8), the first oil outlet (9), the second oil inlet (3), and the second oil outlet (4) are all connected to the cylinder body (2); Wherein, an outer protrusion (12) is provided on one side of the end cover (14), and the outer protrusion (12) is connected to an isolation piece.

2. A stable bidirectional hydraulic cylinder according to claim 1, characterized in that: The isolating member comprises an isolating sleeve (6) screwed to the outer protruding portion (12), the isolating sleeve (6) being provided with a plurality of first elastic sheets (7) spaced apart along the circumferential direction, one end of the first elastic sheet (7) being connected to the isolating sleeve (6), and the other end of the first elastic sheet (7) being in contact with the piston rod (1).

3. A stable bidirectional hydraulic cylinder according to claim 2, characterized in that: The isolation sleeve (6) is provided with a stepped portion, the stepped portion comprising a first stepped surface and a second stepped surface, the first spring sheet (7) being provided on the first stepped surface, a plurality of second spring sheets (11) being provided on the second stepped surface at intervals in the circumferential direction, one end of the second spring sheet (11) being connected to the second stepped surface, the other end of the second spring sheet (11) being in contact with the piston rod (1), and the second spring sheet (11) and the first spring sheet (7) being provided in an offset manner.

4. A stable bidirectional hydraulic cylinder according to claim 1, characterized in that: A plurality of O-rings (13) are arranged between the end cover (14) and the cylinder body (2).

5. A stable bidirectional hydraulic cylinder according to claim 1, characterized in that: Both ends of the piston rod (1) are provided with connecting parts (5).

6. A stable bidirectional hydraulic cylinder according to claim 1, characterized in that: A guide belt (17), a sealing ring (16), and a dustproof ring (15) are sequentially arranged between the cylinder body (2) and the end cover (14).

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