Multilevel control valve

A control valve and control cavity technology, which is applied in mining equipment, earth-moving drilling, pillars/supports, etc., can solve the problems of difficult control of balance and difficult processing, and achieve multi-cylinder pressure follow-up and easy processing. , the effect of easy disassembly and maintenance

Inactive Publication Date: 2009-11-11
SICHUAN AEROSPACE FENGHUO SERVO CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In foreign countries, the German DBT company has carried out research on multi-stage control valves, but the products of DBT company are difficult to process, and the balance is not easy to control, and must be used in conjunction with a special column hydraulic control check valve

Method used

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Examples

Experimental program
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Embodiment Construction

[0025] The multi-stage control valve of the present invention includes a first-stage reversing valve assembly and a second-stage safety valve assembly. The reversing valve assembly includes a reversing valve inlet chamber connected to the hydraulic support balance cylinder, a reversing valve control chamber connected to the hydraulic support column cylinder, and a reversing valve return chamber connected to the safety valve assembly. The reversing valve spool and valve sleeve in the reversing valve assembly are installed in the reversing joint of the reversing valve assembly. The valve assembly adjusts the reversing joint that cooperates with the reversing push rod of the reversing valve assembly under the action of the predetermined load of the spring. The safety valve assembly includes the inlet chamber of the safety valve assembly connected to the outlet chamber of the reversing valve assembly, the liquid return chamber of the safety valve assembly directly emptied, and als...

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Abstract

A multi-stage control valve, including a reversing valve assembly, a safety valve assembly and a valve body, the reversing valve assembly has a reversing valve inlet liquid chamber connected to a hydraulic support balance cylinder, and a reversing valve connected to a hydraulic support column cylinder The control chamber and the reversing valve liquid return chamber connected to the safety valve assembly, the reversing valve spool and valve sleeve located in the reversing valve assembly, are installed in the reversing joint of the reversing valve assembly through the spring seat and the reversing top The rod is the reversing valve assembly adjusting spring that applies a predetermined load to the reversing valve core, and the reversing joint that cooperates with the reversing ejector rod under the action of the predetermined load of the reversing valve assembly adjusting spring. The safety valve assembly includes the safety valve inlet chamber connected with the reversing valve outlet chamber, the safety valve return chamber that is directly emptied, and also includes the safety valve spool, safety valve spring, and the safety valve spring under the action of the predetermined load of the safety valve spring. Safety valve guide piston fitted with safety valve spool. The invention realizes improving the service life of the balance oil cylinder of the hydraulic support, improves the stability of the attitude adjustment of the hydraulic support, and ensures the safe operation of the hydraulic support.

Description

technical field [0001] The invention relates to a multi-stage control valve, in particular to a multi-stage control valve used for hydraulic supports in coal mine fully mechanized mining support equipment. Background technique [0002] Hydraulic support is one of the main equipment to realize the production automation of fully mechanized mining face. The use of hydraulic support can realize the automatic control of production equipment in fully mechanized mining face, improve the production efficiency of the working face, improve the production conditions of the working face, and achieve the purpose of safe production. [0003] At present, in the usual hydraulic support, when the lifting column is about to reach the top, the balance cylinder stops the liquid supply, and the column cylinder pushes the support top plate to the rock formation. During this process, the liquid pressure in the balance cylinder rises, and the balance safety valve remains open for a long time. stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D15/51E21D23/16
Inventor 刘雪垠孙超肖兰芳
Owner SICHUAN AEROSPACE FENGHUO SERVO CONTROL TECH CO LTD
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