Adjustable hydraulic pilot opening mechanism

A technology of hydraulic pilot and opening mechanism, applied in the field of hydraulic components, can solve the problems of easy damage, large impact of pilot valve, short life and so on

Active Publication Date: 2014-05-07
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the disadvantages that the pilot valve of the existing hydraulic pilot opening mechanism is easily damaged due to a large impact and has a short life, and the pilot valve core is in a floating state when the pilot valve is opened, and it is easy to generate vibration and howling. Good stability, low noise, long service life and adjustable opening pressure pilot opening mechanism

Method used

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  • Adjustable hydraulic pilot opening mechanism

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 figure 2 As shown, the valve body is composed of a valve sleeve 12 and a screw plug 11 screwed on the left end of the valve sleeve 12. A valve cavity is provided in the valve body, and a pilot valve is slid in the valve cavity, wherein the left side of the pilot valve is the first One cavity 21, the right side is the second cavity 22, the pilot valve includes a pilot valve core 4 and a pilot valve seat 5, the pilot valve core 4 is provided with an inter-chamber oil connecting the first cavity 21 and the second cavity 22 Road 44, pilot valve orifice 46 is arranged on the inter-cavity oil road. The diameter of the left section of the pilot valve seat 5 is greater than the diameter of the right section, and the valve cavity also has corresponding large and small diameter sections. The effective axial force bearing area of ​​the hydraulic oil in the second cavity 22 acting on the pilot valve is greater than the axial effective force bearing area of ​​the...

Embodiment 2

[0034] Such as image 3 As shown, compared with Embodiment 1, the difference of the pilot opening mechanism in this embodiment lies in the adjustment device. In this embodiment, the end face of the limit adjustment end of the adjustment rod 8 is provided with an end face oil groove 83, and the pilot valve core 4 When in contact with the adjusting rod 8 , the inter-chamber oil passage communicates with the second chamber through the oil groove 83 on the end surface. The other end of the adjustment rod 8 is provided with a screw thread, which forms a threaded connection with the valve sleeve 12. An inner hexagonal counterbore 84 is provided on the end face of the threaded end to rotate the adjustment rod 8 for the use of tools, and the screw end of the adjustment rod 8 is provided with And tighten the nut 9 to prevent the abnormal rotation of the adjusting rod.

Embodiment 3

[0036] Such as Figure 4 As shown, compared with Embodiment 1, the difference of the pilot opening mechanism in this embodiment lies in the valve body and the pilot valve seat. In this embodiment, the valve body is formed by screwing the valve seat 15 and the valve sleeve 12, The left section of the pilot valve seat 5 cooperates with the side wall of the inner cavity of the valve seat, and the pilot valve oil inlet 13 and the pilot valve oil outlet 14 provided on the valve seat 15 communicate with the first cavity 21 and the radial through hole 51 respectively. , the right end surface of the pilot valve seat is provided with a concave cavity, and the side wall of the cavity is slidingly fitted with the side of the adjusting rod 8 to form a second cavity 22 between the pilot valve and the adjusting rod 8, wherein the adjusting rod 8 and the pilot valve The diameter of seat 5 fitting place is less than the diameter of pilot valve seat 5 left section and valve seat 15 lumen sidew...

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PUM

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Abstract

The invention discloses an adjustable hydraulic pilot opening mechanism. The adjustable hydraulic pilot opening mechanism aims to overcome the defect that the conventional pilot opening mechanism can be impacted to be damaged easily and has large noise. The invention provides the pilot opening mechanism. In the mechanism, a differential type pilot valve is adopted; one side of the pilot valve is provided with a first cavity which is communicated with a pilot valve oil inlet, and the other side of the pilot valve is provided with a second cavity which is communicated with the first cavity through an oil way between cavities; a pilot valve plug is arranged in a pilot valve seat in a slidable way; the conical part of the pilot valve plug is positioned in the first cavity and is connected with a buffer spring; the side of the second cavity is provided with a pressure regulation spring and a spiral adjustment mechanism; a pilot valve gap between the pilot valve seat and the pilot valve plug, a radial through hole and a pilot valve oil outlet form a leakage oil way for opening the pilot valve; and the opening pressure can be adjusted through the spiral adjustment mechanism conveniently. Through the differential type pilot valve, the inversed pilot valve plug, the buffer spring, the axial movable pilot seat and the pilot valve plug, the impact force during closing of the pilot valve can be reduced, the pilot valve plug can always be in a stable state, and the opening mechanism has the characteristics of small impact, long service life, stability and low noise, and is easy to adjust.

Description

technical field [0001] The invention relates to a hydraulic component of a hydraulic system, in particular to a pilot opening mechanism in the hydraulic system. technical background [0002] In the existing hydraulic control valves such as relief valves and pressure reducing valves, a hydraulic pilot opening mechanism is commonly used to control the hydraulic pressure in the main spool return spring cavity of the control valve, and the hydraulic pressure in the main spool return spring cavity is reduced. Open the main spool. However, in the existing hydraulic pilot opening device, the pilot valve seat is fixed, and the pilot valve core is positioned in the valve hole of the pilot valve seat through the columnar positioning needle on the top and is intermittently matched with the valve hole. This structure is The pressure regulating spring is used to balance the force of the hydraulic oil on the pilot valve core, so the rigidity of the pressure regulating spring is required ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02
Inventor 吴荫登李群华林建荣高英达
Owner GUANGXI LIUGONG MASCH CO LTD
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