CN213684781U

CN213684781U - Internal support type crane hydraulic oil cylinder

Info

Publication number: CN213684781U
Application number: CN202022754336.0U
Authority: CN
Inventors: 石雨冬; 张虹源; 陈向兵
Original assignee: Xuzhou XCMG Hydraulics Co Ltd
Current assignee: Xuzhou XCMG Hydraulics Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-07-13
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses an interior support formula hoist hydraulic cylinder belongs to pneumatic cylinder technical field. Comprises a cylinder barrel, wherein a guide sleeve is fixed at the front end of the cylinder barrel; the piston rod is arranged in the guide sleeve in a matching way, the inner end of the piston rod is provided with the piston, and the circumferential surface of the piston is in sliding fit with the inner wall of the cylinder barrel; the piston rod is provided with a spacer bush in a sliding fit manner, the spacer bush is positioned in the rod cavity, and an oil through hole communicated with two end faces of the spacer bush is formed in the spacer bush. The length of the spacer bush and the sealing configuration of the supporting ring of the utility model are adjusted according to the design requirements; the spacer bush is provided with the oil through hole, normal work of the small cavity is not affected, the spacer bush can move freely in the small cavity, supporting and guiding effects are achieved, the main supporting effect is achieved when the hydraulic oil cylinder is subjected to radial load, bending deformation of the oil cylinder is reduced, and the unbalance loading resistance of the hydraulic oil cylinder is improved.

Description

Internal support type crane hydraulic oil cylinder

Technical Field

The utility model relates to a pneumatic cylinder technical field specifically is an interior support formula hoist hydraulic cylinder.

Background

The hydraulic oil cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion), and is widely applied to engineering machinery. For the oil cylinder of the crane, when part of products work, not only the axial load needs to be borne, but also a larger radial load needs to be borne, so the flexible deformation of the oil cylinder is larger, the flexible deformation of the oil cylinder is controlled by a pull rod structure in the prior art, but the structure cannot be used when the stroke is larger.

For example, the pull rod oil cylinder (CN 201920512502.0) disclosed in chinese patent comprises a cylinder barrel, a front cover disposed at the front end of the cylinder barrel, a rear cover disposed at the rear of the cylinder barrel, and a piston rod disposed in the cylinder barrel, wherein a piston is sleeved at the lower end of the piston rod, a buffer sleeve sleeved on the piston rod is disposed above the piston, a buffer pad connected to the front cover is disposed at the upper end of the piston rod, the buffer pad is disposed between the front cover and the cylinder barrel, and a copper sleeve is disposed in the front cover.

The problems of the technology are as follows:

the pull rod hydraulic cylinder is a hydraulic cylinder mainly generating pulling force, can generate pushing force at the same time, connects the front cover and the flange plate together to reduce the bending deformation of the cylinder and reduce the vibration generated in the operation process of the pull rod cylinder, but is usually slender, easy to be unstable when bearing pressure and easy to deflect to cause end leakage when being installed.

Disclosure of Invention

In order to solve the technical problem, the utility model provides an interior support formula hoist hydraulic cylinder.

The utility model discloses a following technical scheme realizes: an internal support type crane hydraulic oil cylinder comprises a cylinder barrel, wherein a guide sleeve is fixed at the front end of the cylinder barrel; the piston rod is arranged in the guide sleeve in a matching way, the inner end of the piston rod is provided with the piston, and the circumferential surface of the piston is in sliding fit with the inner wall of the cylinder barrel; the piston rod is provided with a spacer bush in a sliding fit manner, the spacer bush is positioned in the rod cavity, and an oil through hole communicated with two end faces of the spacer bush is formed in the spacer bush.

It further comprises the following steps: grooves are formed in the circumferential surface and the inner wall of the spacer bush, and support rings are installed in the grooves.

Grooves are symmetrically arranged on the circumferential surface and the inner wall of the spacer bush; the central lines of the supporting rings inside and outside the spacer bush are superposed.

The bottom of the cylinder barrel is provided with a large cavity oil port A communicated with the rodless cavity, and the front end of the cylinder barrel is provided with a small cavity oil port B communicated with the rod cavity.

Compared with the prior art, the beneficial effects of the utility model are that: the length of the spacer bush and the sealing configuration of the support ring are adjusted according to design requirements; the spacer bush is provided with the oil through hole, normal work of the small cavity is not affected, the spacer bush can move freely in the small cavity, supporting and guiding effects are achieved, the main supporting effect is achieved when the hydraulic oil cylinder is subjected to radial load, bending deformation of the oil cylinder is reduced, and the unbalance loading resistance of the hydraulic oil cylinder is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the spacer of FIG. 1;

in the figure: 1. a guide sleeve; 2. a cylinder barrel; 3. a spacer sleeve; 4. a piston rod; 5. a piston; 6. and (3) supporting the ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, a guide sleeve 1 is fixed at the front end of a cylinder barrel 2 of the internal support type crane hydraulic cylinder; a piston rod 4 is arranged in the guide sleeve 1 in a matching way, a piston 5 is arranged at the inner end of the piston rod 4, and the circumferential surface of the piston 5 is in sliding fit with the inner wall of the cylinder barrel 2; the bottom of the cylinder barrel 2 is provided with a large cavity oil port A communicated with the rodless cavity, and the front end of the cylinder barrel 2 is provided with a small cavity oil port B communicated with the rodless cavity.

Referring to fig. 2, the spacer 3 is located in the rod cavity, grooves are formed in the circumferential surface and the inner wall of the spacer 3, and support rings 6 are installed in the grooves. The spacer 3 is connected with the piston rod 4 and the inner wall of the cylinder barrel 2 in a sliding way through an inner supporting ring and an outer supporting ring 6. Grooves are symmetrically arranged on the circumferential surface and the inner wall of the spacer bush 3; the central lines of the inner and outer support rings 6 of the spacer 3 are superposed. An oil through hole 3-1 communicated with two end faces of the spacer 3 is arranged in the spacer 3.

The working principle is as follows:

when the piston rod 4 stretches out, the large cavity oil port A is fed with oil, the small cavity oil port B is fed with oil, and the spacer bush 3 is dissociated in the small cavity through the action of oil pressure and self weight and plays a role in supporting and guiding. During the full stroke, the spacer bush 3 stops moving and is in rigid contact with the guide bush 1 and the piston 5;

when the piston rod 4 retracts, the oil port A of the large cavity returns oil, the oil port B of the small cavity returns oil, and the spacer bush 3 gradually separates from the guide bush and the piston and is dissociated in the small cavity;

when the hydraulic cylinder is subjected to radial load, the spacer 3 plays a role in supporting and guiding, the deformation of the cylinder barrel 2 and the piston rod 4 is reduced, and the unbalance loading resistance of the hydraulic cylinder is improved.

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. An internal support type crane hydraulic oil cylinder comprises a cylinder barrel (2), wherein a guide sleeve (1) is fixed at the front end of the cylinder barrel (2); the piston rod (4) is arranged in the guide sleeve (1) in a matching way, the inner end of the piston rod (4) is provided with the piston (5), and the circumferential surface of the piston (5) is in sliding fit with the inner wall of the cylinder barrel (2); the method is characterized in that: the piston rod (4) is provided with a spacer bush (3) in a sliding fit mode, the spacer bush (3) is located in the rod cavity, and an oil through hole (3-1) communicated with two end faces of the spacer bush (3) is formed in the spacer bush (3).

2. An internal support crane hydraulic ram as claimed in claim 1, wherein: grooves are formed in the circumferential surface and the inner wall of the spacer bush (3), and support rings (6) are installed in the grooves.

3. An internal support crane hydraulic ram as claimed in claim 1, wherein: grooves are symmetrically arranged on the circumferential surface and the inner wall of the spacer bush (3); the central lines of the inner and outer support rings (6) of the spacer bush (3) are superposed.

4. An internal support crane hydraulic ram as claimed in claim 1, wherein: the bottom of the cylinder barrel (2) is provided with a large cavity oil port A communicated with the rodless cavity, and the front end of the cylinder barrel (2) is provided with a small cavity oil port B communicated with the rod cavity.