Plug-in electro-hydraulic control valve in the hydraulic system of support (a)

Plug-in discussed in the electro-hydraulic control valve stent application in the hydraulic system and prospects based on proposed design, analysis of the works. Cartridge Valves that through-flow capacity, fast response, the use of electro-hydraulic pilot control, particularly suited to the condition of the stent, in line with the trend of technological development, it is worth promoting.



Keywords: Plug-in Valve; electro-hydraulic control; Stent; hydraulic system



1, based on analysis of application



Moving low-speed has become a fully mechanized production constraints an important factor. To speed up the frame-shift speed, the stent system used hydraulic cartridge valve. Directional Valve Cartridge-type solenoid valve is used as a pilot valve, main valve (poppet valve) to the pilot control, control theory equivalent to electro-hydraulic control valve, but the cartridge valve flow passage of the capacity (up to more than 10000L/min) large , fast response, work to highlight the advantages of reliability is unparalleled tubular valve to make it more suitable to support the electro-hydraulic control systems without the need to develop the pilot to control the use of electromagnetic flow dedicated large main valve, which meet the application requirements, but also improve work performance, improve the general level of a fundamental solution to the tube valve defects inherent problems.



In addition, the design of stent cartridge valve hydraulic system also has the following advantages:



(1) Cartridge Valve is suitable for the advantages of working conditions stent. Hydraulic support of the working condition is characterized by: low-medium viscosity, high pressure, flow, and working environment, medium pollution. Plug-in Valve's strengths can be brought into full play.



(2) in line with the transmission fluid technology trends. In order to reduce cost and eliminate environmental pollution, fluid transmission technology is the direction toward the development of the use of pure water medium. Hydraulic support is closer to nature with the water of the high-water-based emulsion as a working medium, the technology is likely to be the beneficiaries of the fruits of development, is moving to work in water media. Due to the low viscosity of water, the requirements of the sealing valve, and to improve system efficiency. Cartridge Valves using cone sealed with good sealing performance, but also for work in water media, should be preferred as a water valve stent types.



(3) anti-pollution and strong, reliable work. Support work in the mining face, a high degree of media contamination, so that spool of serious wear and tear, shortening the life of the valve, which also led to a variety of stent failure, so that the work of lower reliability, increased maintenance time and reduce the work surface productivity. Cartridge Valves and valve spool of the suites with no stringent requirements, wear light, easy to plug, it does not produce the phenomenon of hydraulic card tight in the medium than the dirty stent when the hydraulic system can guarantee normal work reliably.



(4) to meet the special needs of working condition. Such as strong pressure for the cycle of hard and difficult to support the roof caving stent, in the roof to a sudden pressure, the column control valves under the cavity of the safety valve, to pass a lot of transient traffic, the general safety of the pass far from being able to meet the flow capacity through-flow requirements, and therefore designed a large flow of inflatable safety valve, to adjust to this condition. However, the structure of the valve complex and difficult to manufacture, assembly requirements, the working poor reliability, it is difficult to meet the application requirements. Moreover, the column should be installed under the general safety valve cavity to adapt to the needs of the normal working condition, which will undoubtedly increase the number of components and manufacturing costs. The use of plug-mounted relief valve, you can easily solve this problem, but also will simplify the system.



2, the working principle analysis



Based on the above analysis using the Plug-in design of electro-hydraulic control valve stent design of the hydraulic system and programs, and its working principle as shown in Figure 1. The system consists of two parts, electrical and hydraulic components, stored procedures support the action of micro-computer (the central and stent controller) issued a directive, the cartridge-type valve in the direction of the electromagnetic valve before the pilot action, the two-gate cone valve, connect or disconnect jack post or over the circuit so that actions in accordance with a certain order. Jack post or over working conditions and displacement by the pressure sensor feedback to the controller, the controller feedback signal in accordance with the decision of an action.



Due to the central controller and controller support the Internet, it is from the central controller or the controller of the aircraft can face any of a stent to control the action.



The role of the central controller to control and coordination of the controller for each stent. In addition, the program can automatically, modify system parameters, monitoring of working conditions for each stent, such as display speed shearer. It can support all actions of a separate control, sequence control, group control and automatic control. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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