CN216009548U

CN216009548U - Novel main seal for hydraulic breaking hammer

Info

Publication number: CN216009548U
Application number: CN202122287703.5U
Authority: CN
Inventors: 杜杰; 杨琦
Original assignee: Yantai Runfuxiang Oil Seal Co ltd
Current assignee: Yantai Runfuxiang Oil Seal Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-03-11
Anticipated expiration: 2031-09-22

Abstract

The utility model relates to a novel main seal for a hydraulic breaking hammer, which relates to the technical field of seal rings and comprises an annular closed base body, wherein a groove is formed in the end surface of the base body facing a high-pressure oil side, the end surface of the base body facing the high-pressure oil side is divided into a static seal lip arranged on an outer ring and a main seal tongue arranged on an inner ring by the groove, and a plurality of convex transition ribs are arranged on the inner side surface of the base body at intervals; and defining the axial direction of the base body as an X direction, the direction towards the high-pressure oil side as a positive direction, and an included angle between a connecting line of the starting point and the ending point of the transition rib and the positive direction of the X direction as an obtuse angle. The novel main seal for the hydraulic breaking hammer has the advantages of long service life, good wear resistance and small deformation.

Description

Novel main seal for hydraulic breaking hammer

Technical Field

The utility model relates to the technical field of sealing, in particular to a novel main seal for a hydraulic breaking hammer.

Background

The hydraulic breaking hammer is called as 'breaking hammer' or 'breaker' for short, is arranged on an excavator and a loader and is used for breaking stones, rocks and the like, and is main equipment for mining in the open-pit mining industry. A piston in a middle cylinder body of the breaking hammer and the valve group act mutually, so that the hydraulic breaking hammer realizes striking operation.

The primary seal is an important component of the seal in a hydraulic breaker. The interior of the middle cylinder body is of a hollow structure, the front end of the middle cylinder body is sequentially provided with a dustproof sealing groove, a main oil sealing groove and a buffering ring groove, and the dustproof sealing groove, the main oil sealing groove and the buffering ring groove are used for providing positions for sealing rings installed inside and are convenient for sealing oil in the middle cylinder body.

The primary seal is important for the protection of some hydraulic equipment. If dust or dirt enters the hydraulic equipment, it can cause severe wear not only to the seals and pistons, but can also affect the function of the operating valves and pumps, and can seriously damage such equipment. The main seal can remove dust or dirt on the piston without causing any damage to an oil film on the main seal, and lubrication of the sealing element is facilitated.

The main seal used on the hydraulic breaking hammer at the present stage has the following problems: (1) the dustproof performance is poor, the service life is short, and the reciprocating shaft cannot be protected; (2) the wear resistance is poor when the wear-resistant rubber is matched with a piston and is close to dry friction; (3) the performance of compression set is high.

In view of the above disadvantages, there is a need to develop a new primary seal for a hydraulic demolition hammer.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects in the prior art, the utility model provides a novel main seal for a hydraulic breaking hammer.

The technical scheme is as follows: in order to achieve the purpose, the novel main seal for the hydraulic breaking hammer comprises a base body in an annular closed shape, wherein a groove is formed in the end face, facing the high-pressure oil side, of the base body, the end face, facing the high-pressure oil side, of the base body is divided into a static seal lip arranged on an outer ring and a main seal tongue arranged on an inner ring by the groove, and a plurality of convex transition ribs are arranged on the inner side face of the base body at intervals; and defining the axial direction of the base body as an X direction, the direction towards the high-pressure oil side as a positive direction, and an included angle between a connecting line of the starting point and the ending point of the transition rib and the positive direction of the X direction as an obtuse angle.

Further, the radial direction of the base body is defined as the Y direction, the projection of any two adjacent transition ribs in the Y direction has a crossed part, and the crossed part of the two adjacent transition ribs forms a buffer area.

Further, the cross section of the transition rib is arc-shaped.

Further, the transition rib is spiral.

And furthermore, a circle of auxiliary sealing lips are arranged on the end surface of the base body, which is far away from the high-pressure oil side, and the main sealing tongue and the auxiliary sealing lips are abutted to the surface of the piston, so that the part, which is positioned between the main sealing tongue and the auxiliary sealing lips, of the base body is separated from the surface of the piston to form a cavity.

Further, the axial length of the static sealing lip is greater than the axial length of the main sealing tongue.

Further, the substrate is made of polyurethane.

Further, the polyurethane material of the matrix is subjected to in-situ reinforcement by polyol, isonitrile acid ester and a chain extender.

The novel main seal for the hydraulic breaking hammer at least has the following technical effects: (1) the service life is long, and the service life of the reciprocating shaft can be prolonged; (2) the wear-resisting piston is matched with a piston, so that the wear-resisting performance is good; (3) the performance of compression set is low; (4) the compressive strength, the high temperature resistance and the high strength of the raw materials are improved by carrying out in-situ reinforcement on the polyurethane by using the polyol, the isonitrile acid ester and the chain extender.

Drawings

FIG. 1 is a primary seal used in a prior art hydraulic demolition hammer;

FIG. 2 is a schematic structural view of the present invention after being installed in a middle cylinder;

FIG. 3 is a schematic structural view of the present invention;

fig. 4 is a schematic diagram of the structure of the present invention.

In the figure, 1, a substrate; 2. a groove; 3. a static seal lip; 4. a main sealing tongue; 5. a transition rib; 6. a buffer area; 7. a secondary sealing lip; 8. a cavity.

Detailed Description

The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-4, which are provided by way of example only to illustrate the present invention and not to limit the scope of the present invention.

For convenience and accurate generalization of the scope of the present invention, the axial direction of the base body 1 is defined as the X direction, and the radial direction of the base body 1 is defined as the Y direction, wherein the positive direction of X is toward the high pressure oil side, as shown in fig. 4.

A novel main seal for a hydraulic breaking hammer comprises a closed circular base body 1. The end face, facing the high-pressure oil side, of the base body 1 is provided with a groove 2, and the groove 2 divides the end face, facing the high-pressure oil side, of the base body 1 into a static seal lip 3 arranged on an outer ring and a main seal tongue 4 arranged on an inner ring. The base body 1, the static sealing lip 3 and the main sealing tongue 4 are integrally formed, wherein the axial length of the static sealing lip 3 is larger than that of the main sealing tongue 4. The static sealing lip 3 extends to abut in a sealing groove of the middle cylinder body, and the main sealing tongue 4 extends to enable the main sealing lip to be close to the surface of the piston. And a circle of auxiliary sealing lips 7 are arranged on the end surface of the base body 1 far away from the high-pressure oil side, and the main sealing tongue 4 and the auxiliary sealing lips 7 are abutted to the surface of the piston, so that a cavity 8 is formed by separating the part of the base body 1 between the main sealing tongue 4 and the auxiliary sealing lips 7 from the surface of the piston.

Specifically, a plurality of convex transition ribs 5 are arranged on the inner side surface of the base body 1 at intervals; and an included angle A between a connecting line of the starting point and the ending point of the transition rib 5 and the positive direction of the X, wherein A is an obtuse angle. The projection of any two adjacent transition ribs 5 in the Y direction has a crossing portion, which is the portion B in fig. 4, and the crossing portion of two adjacent transition ribs 5 forms a buffer area 6. In this embodiment, the whole body has a spiral shape with a circular cross section. When high-pressure oil passes through, utilize transition muscle 5 to carry out first step pressure relief, buffer 6 can store fluid in this region when piston reciprocating operation, not only realizes the lubrication action and still utilizes this regional fluid to act as soft seal to realize main sealed sealing performance. The transition rib 5 gradually increases the strength of the auxiliary sealing lip 7 and the main sealing tongue 4, ensures the strength and the service life of the lip and the tongue, reduces the compression permanent deformation performance, improves the comprehensive performance of the main seal, and prolongs the service life of the main seal.

The polyurethane material adopted by the matrix 1 is subjected to in-situ reinforcement of polyol, isonitrile acid ester and a chain extender, so that the compressive strength, the high temperature resistance and the high strength of raw materials are improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A hydraulic pressure quartering hammer is with novel main seal, its characterized in that: the sealing device comprises an annular closed base body (1), wherein a groove (2) is formed in the end face, facing the high-pressure oil side, of the base body (1), the groove (2) divides the end face, facing the high-pressure oil side, of the base body (1) into a static sealing lip (3) arranged on an outer ring and a main sealing tongue (4) arranged on an inner ring, and a plurality of convex transition ribs (5) are arranged on the inner side face of the base body (1) at intervals; the axial direction of the base body (1) is defined as the X direction, the direction towards the high-pressure oil side is the positive direction, and the included angle between the connecting line of the starting point and the finishing point of the transition rib (5) and the positive direction of the X direction is an obtuse angle.

2. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the radial direction of the base body (1) is defined as the Y direction, the projection of any two adjacent transition ribs (5) in the Y direction has a crossed part, and the crossed part of the two adjacent transition ribs (5) forms a buffer area (6).

3. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the cross section of the transition rib (5) is arc-shaped.

4. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the transition rib (5) is in a spiral shape.

5. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the end face, far away from the high-pressure oil side, of the base body (1) is provided with a circle of auxiliary sealing lip (7), the main sealing tongue (4) and the auxiliary sealing lip (7) are abutted to the surface of the piston, and therefore the part, placed between the main sealing tongue (4) and the auxiliary sealing lip (7), of the base body (1) is separated from the surface of the piston to form a cavity (8).

6. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the axial length of the static sealing lip (3) is greater than that of the main sealing tongue (4).

7. The new primary seal for a hydraulic demolition hammer as set forth in claim 1, wherein: the substrate (1) is made of polyurethane.