CN216618090U

CN216618090U - Hydraulic oil cylinder

Info

Publication number: CN216618090U
Application number: CN202122555114.0U
Authority: CN
Inventors: 张晓磊; 佟宁; 岳宏伟
Original assignee: Liaoning Qingshan Heavy Industry Machinery Co ltd
Current assignee: Liaoning Qingshan Heavy Industry Machinery Co ltd
Priority date: 2021-10-23
Filing date: 2021-10-23
Publication date: 2022-05-27
Anticipated expiration: 2031-10-23

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder, which comprises a cylinder body and a cylinder bottom, wherein a piston rod is arranged in the cylinder body, a piston is fixed at one end of the piston rod, which is positioned in the cylinder body, and an extension cavity is formed between the piston and the cylinder bottom; a contraction cavity is formed between the piston rod and the cylinder body, the piston rod is far away from one side of the cylinder bottom, an oil supply pipe communicated with the extension cavity and the contraction cavity is installed on the side wall of the cylinder body, and the oil supply pipe is connected with an oil supply pump; an annular groove is arranged on the circumferential surface of one side of the piston rod close to the cylinder bottom; the piston is provided with at least one eccentric threaded hole corresponding to the annular groove; after the piston and the piston rod are assembled, the set screw penetrates through the eccentric threaded hole and is screwed into the annular groove. The piston and the piston rod are connected together through the annular groove, the eccentric threaded hole and the set screw, the piston is locked, the effective length of the piston rod is effectively reduced, the internal structure of the rod body is compact, the requirement for small installation space is met, and the service environment with length requirement on the stroke of the oil cylinder is met.

Description

Hydraulic oil cylinder

Technical Field

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a hydraulic oil cylinder which has the characteristic of compact structure.

Background

The connection between the piston rod and the piston has various types, but all the modes need a locking device to prevent the piston rod and the piston from loosening and separating when the hydraulic oil cylinder reciprocates; common connection modes include a clamping ring type, a shaft sleeve type and a locking nut type, the clamping ring type, the shaft sleeve type and the locking nut type all meet the requirement of locking a piston, and the locking devices of the above types occupy relatively large space due to the limitation of a mechanical structure, and a certain length is reserved in the axial direction of a piston rod to install a clamping ring and a shaft sleeve; there are limitations to the cylinders required for some special applications, such as hydraulic cylinders which require short overall length but large stroke requirements. Therefore, the content structure of the oil cylinder needs to be improved, so that the moving stroke of the piston rod is properly prolonged under the condition that the total length is not changed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a hydraulic oil cylinder.

In order to achieve the purpose, the utility model adopts the following technical scheme: a hydraulic cylinder comprises a cylinder body and a cylinder bottom, wherein a piston rod is arranged in the cylinder body, a piston is fixed at one end of the piston rod, which is positioned in the cylinder body, and an extension cavity is formed between the piston and the cylinder bottom; a contraction cavity is formed between the piston rod and the cylinder body, the piston rod is far away from one side of the cylinder bottom, an oil supply pipe communicated with the extension cavity and the contraction cavity is installed on the side wall of the cylinder body, and the oil supply pipe is connected with an oil supply pump;

an annular groove is formed in the circumferential surface of the piston rod, which is close to one side of the cylinder bottom; the piston is provided with at least one eccentric threaded hole corresponding to the annular groove; after the piston and the piston rod are assembled, the set screw penetrates through the eccentric threaded hole and is screwed into the annular groove.

Further, the eccentric threaded hole is offset rightward by 0.5mm from the center of the annular groove.

Furthermore, a rod head is fixed at one end of the piston rod, which is positioned outside the cylinder body, and a bearing is installed in the center of the rod head.

Furthermore, a connector is fixed on the outer side of the cylinder bottom, and a bearing is installed in the center of the connector.

Furthermore, the number of the eccentric threaded holes is 2-4, and the eccentric threaded holes are uniformly distributed on the peripheral wall of the piston.

Furthermore, a T-shaped guide ring is arranged on the outer peripheral surface of the piston.

Further, the section of the annular groove is rectangular or V-shaped.

Compared with the prior art, the utility model has the beneficial effects that: the piston and the piston rod are connected together through the annular groove, the eccentric threaded hole and the set screw, the piston is locked, the effective length of the piston rod is effectively reduced, the internal structure of the rod body is compact, the requirement for small installation space is met, and the service environment with length requirement on the stroke of the oil cylinder is met.

Drawings

FIG. 1 is a schematic structural view of a hydraulic cylinder according to the present invention;

FIG. 2 is a partial schematic view of a hydraulic ram of the present invention;

FIG. 3 is a schematic diagram of a hydraulic cylinder of the prior art;

wherein: the hydraulic cylinder comprises a cylinder body 1, a piston rod 2, a piston 3, a T-shaped guide ring 4, an eccentric threaded hole 5, a set screw 6, an annular groove 7, a cylinder bottom 8, an extension cavity 9, a rod head 10, a connector 11, an oil supply pipe 12 and an oil supply pump 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides an embodiment: a hydraulic oil cylinder comprises a cylinder body 1 and a cylinder bottom 8, wherein a piston rod 2 is arranged in the cylinder body 1, a piston 3 is fixed at one end of the piston rod 2, which is positioned in the cylinder body 1, and the piston rod 2 is connected with the piston through threads; an extension cavity 9 is formed between the piston 3 and the cylinder bottom 8; a contraction cavity is formed between the piston rod 2 and the cylinder body 1, the side wall of the cylinder body 1 at two axial ends is provided with an oil inlet hole, the oil inlet hole is hermetically connected with an oil supply pipe 12 outside the cylinder body 1, the oil supply pipe 12 is connected with an oil supply pump 13, and oil is supplied to the extension cavity 9 and the contraction cavity through the oil supply pump 13, so that the movement of the piston is controlled;

as shown in fig. 2, the conventional piston and the piston rod are fixed by a connecting nut, or by a shaft sleeve, a snap ring, or the like, which has the disadvantages that a certain space is occupied, the piston rod needs to be axially reserved with a certain length, and the piston rod is not suitable for a use environment with a small space but with a certain requirement on the stroke;

in the embodiment of the application, the circumferential surface of the piston rod 2 close to the cylinder bottom 8 is provided with an annular groove 7; at least one eccentric threaded hole 5 corresponding to the annular groove 7 is formed in the circumferential surface of the piston 3; after the piston 3 is assembled with the piston rod 2, the set screw 6 passes through the eccentric threaded hole 5 and is screwed into the annular groove 7 and props against the bottom surface of the annular groove 7; the eccentric threaded hole 5 deviates rightwards relative to the center of the annular groove, the specific deviation displacement is determined according to the overall size of the oil cylinder, in the embodiment, the eccentric threaded hole 5 deviates rightwards 0.5mm relative to the center of the annular groove, after the set screw 6 is screwed in, the threaded connection between the piston rod 2 and the piston 3 is tighter, after long-time use, the set screw 6 can still axially limit the piston 3 to prevent the loosening of the piston 3, and during impact load, the set screw 6 can also prevent the loosening between the piston 3 and the piston rod 2;

the annular groove 7 may be rectangular or "V" shaped in cross-section, the specific shape being dependent on the selected set screw 6.

Furthermore, a rod head 10 is fixed at one end of the piston rod 2 positioned outside the cylinder body 1, a connector 11 is fixed outside the cylinder bottom 8, and a bearing is installed at the center of the rod head 10 and the connector 11.

Further, as a preferred embodiment, the number of the eccentric screw holes 5 is 2 to 4, and the eccentric screw holes are uniformly distributed on the peripheral wall of the piston 3.

Further, install T type guide ring 4 on the outer peripheral face of piston 3, T type guide ring 4 has great area of contact with the body of rod inner wall, has better protection and sealing effect, can suitably reduce the axial length of piston 3, the relative effective stroke that has increased the piston rod. The hydraulic cylinder is particularly suitable for hydraulic cylinders with short overall length requirement and large stroke requirement.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a hydraulic cylinder, includes cylinder body and cylinder bottom, is equipped with the piston rod in the cylinder body, and the one end that the piston rod is located the cylinder body is fixed with piston, its characterized in that: an extension cavity is formed between the piston and the cylinder bottom; a contraction cavity is formed between the piston rod and the cylinder body, the piston rod is far away from one side of the cylinder bottom, an oil supply pipe communicated with the extension cavity and the contraction cavity is installed on the side wall of the cylinder body, and the oil supply pipe is connected with an oil supply pump;

2. A hydraulic ram according to claim 1 wherein: the eccentric threaded hole is shifted by 0.5mm to the right relative to the center of the annular groove.

3. A hydraulic ram according to claim 1 wherein: and a rod head is fixed at one end of the piston rod, which is positioned outside the cylinder body, and a bearing is arranged in the center of the rod head.

4. A hydraulic ram according to claim 1 wherein: the outer side of the cylinder bottom is fixed with a connector, and a bearing is arranged in the center of the connector.

5. A hydraulic ram according to claim 1 wherein: the number of the eccentric threaded holes is 2-4, and the eccentric threaded holes are uniformly distributed on the peripheral wall of the piston.

6. A hydraulic ram according to claim 1 wherein: and a T-shaped guide ring is arranged on the peripheral surface of the piston.

7. A hydraulic ram according to claim 1 wherein: the section of the annular groove is rectangular or V-shaped.