CN210068627U

CN210068627U - Buffer device for hydraulic oil cylinder and hydraulic oil cylinder

Info

Publication number: CN210068627U
Application number: CN201920707678.1U
Authority: CN
Inventors: 贾婷婷; 马永杰; 杨成标
Original assignee: Shandong Xingao Hydraulic Machinery Co Ltd
Current assignee: Shandong Xingao Hydraulic Machinery Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-02-14
Anticipated expiration: 2029-05-16

Abstract

The utility model belongs to a buffer and hydraulic cylinder that hydraulic cylinder used, including hollow bolt, be equipped with the blind hole that runs through the hollow bolt head among the hollow bolt, hollow bolt's afterbody is equipped with the spiral shell head. And a first throttling hole, a second throttling hole, a third throttling hole and a fourth throttling hole which penetrate through the blind holes are formed in the outer side surface of the hollow bolt. The first throttle hole and the second throttle hole are arranged on one side far away from the screw head, the first throttle hole and the second throttle hole are symmetrically arranged relative to the axis of the blind hole, and the first throttle hole is perpendicular to the axis of the hollow bolt. The third orifice is arranged between the first orifice and the screw head, and the fourth orifice is arranged between the second orifice and the screw head. The distance between the third throttling hole and the screw head is larger than that between the fourth throttling hole and the screw head. The utility model can realize the buffer of the piston rod when retracting, and has good buffer effect; the piston rod can be completely recovered in a short time.

Description

Buffer device for hydraulic oil cylinder and hydraulic oil cylinder

Technical Field

The utility model belongs to the technical field of hydraulic cylinder, concretely relates to buffer and hydraulic cylinder that hydraulic cylinder used.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion).

The inventor has appreciated that, in order to achieve buffering when a piston rod in a hydraulic oil cylinder retracts, a hollow bolt is generally arranged at one end of a cylinder body, which is far away from a piston rod extending head, an oil inlet hole is arranged on the hollow bolt, and a buffering hole is arranged at one end of the piston rod, which is close to the hollow bolt. And the buffer effect is realized through the overflow gap between the hollow bolt and the buffer ring.

However, the inventor believes that the conventional buffer effect achieved by the relief gap between the hollow bolt and the buffer ring is poor, and the piston rod cannot be completely recovered in a short time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, and provides a buffer device for a hydraulic cylinder, which can realize the buffer of a piston rod when the piston rod retracts and has good buffer effect; the piston rod can be completely recovered in a short time.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the buffering device for the hydraulic cylinder comprises a hollow bolt, wherein a blind hole penetrating through the head of the hollow bolt is formed in the hollow bolt, and a screw head is arranged at the tail of the hollow bolt.

And a first throttling hole, a second throttling hole, a third throttling hole and a fourth throttling hole which penetrate through the blind holes are formed in the outer side surface of the hollow bolt.

The first throttle hole and the second throttle hole are arranged on one side far away from the screw head, the first throttle hole and the second throttle hole are symmetrically arranged relative to the axis of the blind hole, and the first throttle hole is perpendicular to the axis of the hollow bolt.

The third orifice is arranged between the first orifice and the screw head, and the fourth orifice is arranged between the second orifice and the screw head.

The distance between the third throttling hole and the screw head is larger than that between the fourth throttling hole and the screw head.

An oil inlet is formed in the end portion, close to the screw head, of the hollow bolt.

Further, the orthographic projection of the first throttle hole and the third throttle hole in a plane perpendicular to the axis of the blind hole coincides.

Further, the orthographic projection of the second throttle hole and the orthographic projection of the fourth throttle hole in one plane perpendicular to the axis of the blind hole coincide.

A hydraulic cylinder utilizes the buffer device for the hydraulic cylinder, and comprises a cylinder body and a piston rod, wherein the tail part of the piston rod extends into the cylinder body and is fixedly connected with a piston, a first end cover is arranged on the end surface, far away from the head part of the piston rod, in the cylinder body, the screw head of a hollow bolt is fixedly arranged outside the first end cover, and the head part of the hollow bolt extends into the inner cavity of the cylinder body; one end of the piston rod, which is close to the piston, is provided with a buffer hole, and the head of the hollow bolt can penetrate through the piston and extend into the buffer hole.

Furthermore, a second cavity is formed between the piston and the first end cover, a boss is arranged on the outer side surface of the first end cover, a mounting hole is formed in the boss, the hollow bolt penetrates through the mounting hole and is fixed with the mounting hole through threads, an oil hole is formed in one side of the boss, and the oil hole is communicated with the oil inlet.

Furthermore, a second end cover is arranged on one side, far away from the first end cover, of the cylinder body, and a first cavity is formed among the second end cover, the piston rod and the piston.

Furthermore, a through hole is formed in the piston, a buffer ring is arranged in the through hole, and the head of the hollow bolt can penetrate through the buffer ring and extend into the buffer hole.

The utility model has the advantages that:

1) the hollow bolt provided with the first throttling hole, the second throttling hole, the third throttling hole and the fourth throttling hole is used as a buffer device, so that not only is a good buffering effect of the oil cylinder ensured, but also the piston rod can be recycled thoroughly without being clamped.

2) When the piston rod is recovered to a certain position, the hollow bolt is just contacted with the buffer ring, the oil pressure is instantly increased to 2-3 times of the working pressure, good buffer effect cannot be guaranteed only through an overflow gap between the hollow bolt and the buffer ring, meanwhile, the piston rod can be completely recovered, the instantly and rapidly increased oil pressure can be reduced through the first throttling hole and the second throttling hole, and the hydraulic oil of the second cavity can be ensured to smoothly flow out, so that the piston rod is not clamped.

3) Along with the indentation of piston rod, when the piston rod indentation was fast to the bottom, only can not guarantee completely through the overflow gap that the piston rod retrieves thoroughly, increase third orifice and fourth orifice, it is thorough to enable the piston rod to retrieve in the specified time. In addition, the piston rod can be pushed out quickly due to the existence of the fourth throttling hole, and quick starting is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a sectional view of the overall structure in embodiment 1 of the present invention;

fig. 2 is a cross-sectional view of the overall structure in embodiment 2 of the present invention;

in the figure: 1. a second orifice; 1A, blind holes; 2. a first orifice; 3. a third orifice; 4. a fourth orifice; 5. a first cavity; 6. a hollow bolt; 7. a buffer ring; 8. a retainer ring; 9. a second cavity; 10. a combination washer; 11. an oil hole; 12. and an oil inlet.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In a typical embodiment of the present invention, as shown in fig. 1-2, a buffering device for a hydraulic cylinder comprises a hollow bolt 6, wherein a blind hole penetrating through the head of the hollow bolt 6 is formed in the hollow bolt 6, and a screw head is formed at the tail of the hollow bolt 6;

the outer side surface of the hollow bolt 6 is provided with a first throttle hole 2, a second throttle hole 1, a third throttle hole 3 and a fourth throttle hole 4 which penetrate through the blind hole 1A;

the first throttle hole 2 and the second throttle hole 1 are arranged on one side far away from the screw head, the first throttle hole 2 and the second throttle hole 1 are symmetrically arranged about the axis of the blind hole, and the first throttle hole 2 is vertical to the axis of the hollow bolt 6;

the third orifice 3 is arranged between the first orifice 2 and the screw head, and the fourth orifice 4 is arranged between the second orifice 1 and the screw head;

the distance between the third throttling hole 3 and the screw head is larger than that between the fourth throttling hole 4 and the screw head;

an oil inlet 12 is formed in the end part, close to the screw head, of the hollow bolt 6.

Preferably, the orthographic projection of the first throttle bore 2 and the third throttle bore 3 in a plane perpendicular to the axis of the blind bore coincides.

Preferably, the orthographic projection of the second throttle hole 1 and the orthographic projection of the fourth throttle hole 4 in a plane perpendicular to the axis of the blind hole coincide.

Preferably, the first orifice 2, the second orifice 1, the third orifice 3 and the fourth orifice 4 have a hole diameter of 1 to 3 mm.

A kind of hydraulic cylinder, has utilized the said buffer unit that the hydraulic cylinder uses, including cylinder body and piston rod, the foot section of the said piston rod stretches into the cylinder body and fixedly connects with piston, the end surface far away from the head of piston rod in the said cylinder body has first end caps, the spiral shell head of the said hollow bolt 6 is fixedly set up outside first end cap, the head of the said hollow bolt 6 stretches into the cylinder body cavity; one end of the piston rod close to the piston is provided with a buffer hole, and the head of the hollow bolt 6 can penetrate through the piston and extend into the buffer hole.

Specifically, one side of the buffer ring 7 close to the first end cover is provided with a retainer ring 8. The retainer ring 8 is arranged in a through hole of the piston, and the retainer ring 8 is used for fixing the buffer ring 7.

Preferably, a second cavity 9 is formed between the piston and the first end cover, a boss is arranged on the outer side surface of the first end cover, a mounting hole is formed in the boss, the hollow bolt 6 penetrates through the mounting hole and is fixed with the mounting hole through threads, an oil hole 11 is formed in one side of the boss, and the oil hole 11 is communicated with the oil inlet.

Specifically, a combined gasket 10 is arranged between the boss and the first end cover and between the screw head and the boss, so as to realize sealing.

Preferably, a second end cover is arranged on one side, far away from the first end cover, of the cylinder body, and a first cavity 5 is formed among the second end cover, the piston rod and the piston.

Specifically, the alternate oil supply of the first cavity 5 and the second cavity 9 realizes the reciprocating motion of the hydraulic oil cylinder, specifically, how to realize the oil supply of the first cavity and the second cavity, and how to set the external oil path belongs to the prior art, and the description is omitted here, but it should not be considered as unclear.

Preferably, a through hole is formed in the piston, a buffer ring 7 is arranged in the through hole, and the head of the hollow bolt 6 can penetrate through the buffer ring 7 and extend into the buffer hole.

The working principle is as follows: when the piston rod recovers to a certain position, the hollow bolt 6 is just contacted with the buffer ring 7, the oil pressure is instantly increased to 2-3 times of the working pressure, the good buffer effect cannot be ensured only by the overflow gap between the hollow bolt 6 and the buffer ring 7, and simultaneously the piston rod can be completely recovered, the instantly increased oil pressure can be reduced by the first throttling hole 2 and the second throttling hole 1, the hydraulic oil of the second cavity 9 can be ensured to smoothly flow out, and the piston rod cannot be clamped.

Along with the indentation of piston rod, third orifice 3 and fourth orifice 4 begin to play a role, when the piston rod indentation was fast to the bottom, through experimental study know only can not guarantee completely through the overflow gap piston rod retrieve thoroughly (there is 20 mm's length approximately), increase fourth orifice 4, make the piston rod retrieve thoroughly in the specified time. In addition, the piston rod can be pushed out quickly due to the existence of the fourth throttling hole 4, and quick starting is achieved.

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims

1. The buffer device for the hydraulic oil cylinder is characterized by comprising a hollow bolt, wherein a blind hole penetrating through the head of the hollow bolt is formed in the hollow bolt, and a screw head is arranged at the tail of the hollow bolt;

a first throttling hole, a second throttling hole, a third throttling hole and a fourth throttling hole which penetrate through the blind holes are formed in the outer side surface of the hollow bolt;

the first throttle hole and the second throttle hole are arranged on one side far away from the screw head, the first throttle hole and the second throttle hole are symmetrically arranged relative to the axis of the blind hole, and the first throttle hole is vertical to the axis of the hollow bolt;

the third throttling hole is arranged between the first throttling hole and the screw head, and the fourth throttling hole is arranged between the second throttling hole and the screw head;

the distance between the third throttling hole and the screw head is larger than that between the fourth throttling hole and the screw head;

2. A shock absorber for a hydraulic ram according to claim 1 wherein the first orifice coincides with the orthographic projection of the third orifice in a plane perpendicular to the axis of the blind bore.

3. A shock absorber for a hydraulic ram according to claim 2 wherein the orthographic projection of said second orifice and said fourth orifice in a plane perpendicular to the axis of said blind bore coincide.

4. The shock absorber for a hydraulic cylinder according to claim 1, wherein the first orifice, the second orifice, the third orifice and the fourth orifice have a hole size of 1 to 3 mm.

5. A hydraulic oil cylinder utilizes the buffer device for the hydraulic oil cylinder as claimed in any one of claims 1 to 4, and is characterized by comprising a cylinder body and a piston rod, wherein the tail part of the piston rod extends into the cylinder body and is fixedly connected with the piston, a first end cover is arranged on the end surface of the cylinder body far away from the head part of the piston rod, the screw head of a hollow bolt is fixedly arranged outside the first end cover, and the head part of the hollow bolt extends into the inner cavity of the cylinder body; one end of the piston rod, which is close to the piston, is provided with a buffer hole, and the head of the hollow bolt can penetrate through the piston and extend into the buffer hole.

6. The hydraulic cylinder as recited in claim 5, wherein a second cavity is formed between the piston and the first end cap, a boss is provided on an outer side surface of the first end cap, a mounting hole is provided in the boss, the hollow bolt passes through the mounting hole and is fixed to the mounting hole by a screw, and an oil hole is provided on one side of the boss and is communicated with the oil inlet.

7. A hydraulic cylinder according to claim 5, characterised in that a second end cap is provided on the side of the cylinder body remote from the first end cap, the second end cap, the piston rod and the piston defining a first chamber therebetween.

8. A hydraulic cylinder according to claim 5, characterised in that the piston is provided with a through bore in which is located a damping ring, the head of the hollow bolt being able to pass through the damping ring and extend into the damping bore.