CN108533567B

CN108533567B - Hydraulic cylinder buffer structure

Info

Publication number: CN108533567B
Application number: CN201810668700.6A
Authority: CN
Inventors: 王世永
Original assignee: Xuzhou Yongjia Hydraulic Equipment Co Ltd
Current assignee: Xuzhou Yongjia Hydraulic Equipment Co Ltd
Priority date: 2018-06-26
Filing date: 2018-06-26
Publication date: 2020-04-07
Anticipated expiration: 2038-06-26
Also published as: CN108533567A

Abstract

The invention discloses a hydraulic cylinder buffer structure, and belongs to the technical field of hydraulic cylinders. Comprises a cylinder body and a piston rod; a buffer cavity is arranged inside the cylinder body; the piston rod is provided with a piston, and the inner end of the piston rod is provided with a buffer end matched with the buffer cavity; the buffer cavity is a cylindrical blind hole; the buffering end is cylindrical, and a mounting hole is formed in the center of the buffering end; a diversion trench is formed in the position, close to the inner side, of the mounting hole and communicated with the inner side and the outer side of the mounting hole; a buffer plug is slidably mounted in the mounting hole, and is provided with a flow guide hole which is axially communicated; and a spring is arranged between the buffer plug and the bottom of the mounting hole. When the buffer end and the buffer cavity are matched for buffering, the flow is regulated through the oil pressure of the spring and the buffer cavity, and a stable change process of the flow is ensured; the whole structure is simple, the processing and the manufacturing are convenient, and the cost is low.

Description

Hydraulic cylinder buffer structure

Technical Field

The invention relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder buffer structure.

Background

When the hydraulic cylinder works at a high speed, if the piston directly collides with the end cover of the hydraulic cylinder, the end cover can be damaged under the action of inertia force and hydraulic pressure, and large impact load can be generated to generate adverse effect on a hydraulic system. The hydraulic damping device may decelerate to zero when the piston reaches the end of its stroke. The classical buffering device is designed to seal part of oil in an oil discharge cavity within a certain distance before a piston reaches a terminal end, and the oil is discharged through a small throttling hole, so that proper buffering pressure is generated, and the aim of speed reduction is fulfilled.

In order to ensure a smooth buffering process of the hydraulic cylinder, the buffering end and the buffering cavity are made into a matched conical shape, so that a smooth change process of the flow is ensured. The structure is complex to process and high in cost.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a hydraulic cylinder cushion structure.

The invention is realized by the following technical scheme: a kind of hydraulic cylinder buffer structure, including cylinder block and piston rod; a buffer cavity is arranged inside the cylinder body; the piston rod is provided with a piston, and the inner end of the piston rod is provided with a buffer end matched with the buffer cavity; the buffer cavity is a cylindrical blind hole; the buffering end is cylindrical, and a mounting hole is formed in the center of the buffering end; a diversion trench is formed in the position, close to the inner side, of the mounting hole and communicated with the inner side and the outer side of the mounting hole; a buffer plug is slidably mounted in the mounting hole, and is provided with a flow guide hole which is axially communicated; and a spring is arranged between the buffer plug and the bottom of the mounting hole.

It further comprises the following steps: the buffer plug comprises a cylindrical side wall and a bottom plate fixed at one end of the side wall, and the bottom plate is positioned at one end, far away from the buffer end, of the side wall; an outer sleeve is fixed inside the buffer plug bottom plate; an inner sleeve opposite to the outer sleeve is fixed at the bottom of the buffering end mounting hole; the two ends of the spring are respectively positioned in the outer sleeve and the inner sleeve.

The diversion hole is positioned on the bottom plate of the buffer plug and far away from the edge of the outer sleeve.

The outer wall of the buffer plug is provided with a limit bolt through threaded connection; the outer end of the limiting bolt is positioned in the diversion trench.

Compared with the prior art, the invention has the beneficial effects that: when the buffer end and the buffer cavity are matched for buffering, the flow is regulated through the oil pressure of the spring and the buffer cavity, and a stable change process of the flow is ensured; the whole structure is simple, the processing and the manufacturing are convenient, and the cost is low.

Drawings

FIG. 1 is a schematic diagram of the present invention.

In the figure: 1. a cylinder body; 2. a piston rod; 3. a buffer chamber; 4. a buffer end; 4-1, mounting holes; 4-2, a diversion trench; 4-3, an inner sleeve; 5. a buffer plug; 5-1, flow guide holes; 5-2, an outer sleeve; 6. a spring; 7. and a limiting bolt.

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.

As shown in fig. 1, a hydraulic cylinder cushion structure includes a cylinder body 1 and a piston rod 2; a buffer cavity 3 is arranged inside the cylinder body 1; the piston rod 2 is provided with a piston, and the inner end of the piston rod 2 is provided with a buffer end 4 matched with the buffer cavity.

The improvement of the embodiment is that:

the buffer chamber 3 is a cylindrical blind hole. The buffering end 4 is cylindrical, and a mounting hole 4-1 is formed in the center of the buffering end 4; the position of the mounting hole 4-1 close to the inner side is provided with a diversion trench 4-2, and the diversion trench 4-2 is communicated with the inner side and the outer side of the mounting hole 4-1. A buffer plug 5 is slidably mounted in the mounting hole 4-1, the buffer plug 5 comprises a cylindrical side wall and a bottom plate fixed at one end of the side wall, and the bottom plate is positioned at one end, far away from the buffer end 4, of the side wall; an outer sleeve 5-2 is fixed inside the bottom plate of the buffer plug 5; an inner sleeve 4-3 opposite to the outer sleeve 5-2 is fixed at the bottom of the mounting hole 4-1 of the buffering end 4; the two ends of the spring 6 are respectively positioned in the outer sleeve 5-2 and the inner sleeve 4-3. The buffer plug 5 is provided with a flow guide hole 5-1 which is axially communicated, and the flow guide hole 5-1 is positioned on the bottom plate of the buffer plug 5 and is far away from the edge position of the outer sleeve 5-2. The outer wall of the buffer plug 5 is provided with a limit bolt 7 through threaded connection; the outer end of the limiting bolt 7 is positioned in the diversion trench 4-2.

The working process is as follows:

when the buffering end enters the buffering cavity, the whole buffering structure starts to work;

the oil pressure in the buffer cavity is higher and higher to push the buffer plug to move left;

the buffer plug moves left to cover part of the diversion trench, so that the oil passing amount is reduced, and the buffer effect is improved;

conversely, when the oil pressure in the cushion chamber decreases (indicating a decrease in speed), the cushion effect decreases;

the buffer effect is guaranteed to be in direct proportion to the oil pressure.

When the buffer end and the buffer cavity are matched for buffering, the flow is regulated through the oil pressure of the spring and the buffer cavity, and a stable change process of the flow is ensured; the whole structure is simple, the processing and the manufacturing are convenient, and the cost is low.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A hydraulic cylinder buffer structure comprises a cylinder body (1) and a piston rod (2); a buffer cavity (3) is arranged in the cylinder body (1); a piston is arranged on the piston rod (2), and a buffer end (4) matched with the buffer cavity is arranged at the inner end of the piston rod (2);

the method is characterized in that:

the buffer cavity (3) is a cylindrical blind hole;

the buffering end (4) is cylindrical, and a mounting hole (4-1) is formed in the center of the buffering end (4); a diversion trench (4-2) is formed in the position, close to the inner side, of the mounting hole (4-1), and the diversion trench (4-2) is communicated with the inner side and the outer side of the mounting hole (4-1);

a buffer plug (5) is slidably mounted in the mounting hole (4-1), and the buffer plug (5) is provided with a flow guide hole (5-1) which is axially communicated; and a spring (6) is arranged between the buffer plug (5) and the bottom of the mounting hole (4-1).

2. The hydraulic cylinder cushion structure according to claim 1, characterized in that: the buffer plug (5) comprises a cylindrical side wall and a bottom plate fixed at one end of the side wall, and the bottom plate is positioned at one end, far away from the buffer end (4), of the side wall; an outer sleeve (5-2) is fixed inside the bottom plate of the buffer plug (5); an inner sleeve (4-3) opposite to the outer sleeve (5-2) is fixed at the bottom of the mounting hole (4-1) of the buffer end (4); two ends of the spring (6) are respectively positioned in the outer sleeve (5-2) and the inner sleeve (4-3).

3. The hydraulic cylinder cushion structure according to claim 2, wherein: the flow guide hole (5-1) is positioned on the bottom plate of the buffer plug (5) and is far away from the edge of the outer sleeve (5-2).

4. The hydraulic cylinder cushion structure according to claim 1, characterized in that: the outer wall of the buffer plug (5) is provided with a limit bolt (7) through threaded connection; the outer end of the limiting bolt (7) is positioned in the diversion trench (4-2).