Piston for avoiding clamping stagnation

A piston and integrated technology, which is applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problems of pilot control valve piston sticking, etc., and achieve the effects of reducing maintenance costs, long service life, improving use efficiency and use quality

Inactive Publication Date: 2016-06-15

龙工(上海)精工液压有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a stuck-avoiding piston wit...

Abstract

The invention provides a piston that avoids sticking, which is characterized in that it includes a first part, a second part and a third part arranged in sequence from top to bottom, the first part and the second part are cylindrical, and the top of the third part The surface is circular, and its outer diameter is larger than that of the first part, and the outer diameter of the first part is larger than that of the second part, wherein the transition between the side surface of the second part and the top surface of the third part is rounded. The invention cancels the outer circular groove of the steel wire retaining ring, and adds a second cylindrical part and a third cylindrical part on the basis of the outer cylindrical surface of the traditional piston. The side of the second cylindrical part is connected with the third cylindrical part Round transitions are used between the top faces of the shaped parts. The invention has simple structure and long service life, can better solve the stuck situation of the piston, reduce the after-sale maintenance cost of the pilot control valve, and improve the use efficiency and quality of the hydraulic pilot control system of the whole machine.

Application Domain

Valve arrangementsPlungers +1

Technology Topic

PistonEngineering +2

Image

Examples

Experimental program(1)

Example Embodiment

[0016] Example

[0017] Such as figure 2 As shown, the piston for avoiding seizure of the present invention is composed of a hemispherical part 4, a first part 1, a rounded truncated cone-shaped part 5, a second part 2 and a third part 3 arranged in order from top to bottom. The second part 2 and the third part 3 are cylindrical, the upper side of the first part 1 is provided with a hemispherical part 4, and the first part 1 and the second part 2 transition through the rounded truncated cone-shaped part 5, The outer diameter of the top surface of the truncated cone-shaped part 5 is equal to the outer diameter of the first part 1, and the outer diameter of the bottom surface of the truncated cone-shaped part 5 is equal to the outer diameter of the second part 2. The hemispherical part 4, the first part 1 , The rounded cone-shaped part 5, the second part 2 and the third part 3 are integrally formed.

[0018] Such as image 3 As shown, the outer diameter of the first cylindrical part 1 can ensure that the piston can pass through flexibly, and the gap with the inner cylindrical surface of the piston seat is small. The top surface of the third part 3 is circular, and its outer diameter is greater than the outer diameter of the first part 1, and the outer diameter of the first part 1 is greater than the outer diameter of the second part 2, wherein the side surface 2-2 of the second part 2 is The top surface 2-4 of the three parts 3 adopts a rounded corner 2-3 transition.

[0019] When used, such as Figure 4 with Figure 5 As shown, the working piston of the pilot control valve is reset, and the outer ring plane 5-1 of the lower end of the piston seat contacts the top surface 2-4 of the third part 3 to generate a collision force. The collision force contact changes from the previous line contact to the surface contact. The force area becomes larger and the applied pressure decreases, so that the deformation of the piston seat by the collision force is very small, and the rounded corner 2-3 is increased. The above collision force is converted into an upward force and directly acts on the side of the second part 2. 2-2, but it will not cause the outer diameter of the side 2-2 of the second part 2 to increase. At the same time, under the long-term operation of the pilot control valve, the inner diameter of the edge generated by the deformation of the collision is always greater than the side of the second part 2. 2-2 outer diameter, so the failure of piston jam is completely avoided.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple structure
Extended service life

Piston for avoiding clamping stagnation

A piston and integrated technology, which is applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problems of pilot control valve piston sticking, etc., and achieve the effects of reducing maintenance costs, long service life, improving use efficiency and use quality

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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