A hydraulic support intelligent liquid supply pump station and its control method

Abstract

The invention relates to an intelligent liquid supply pump station for a hydraulic support and a control method thereof. When the hydraulic support requires a large amount of liquid, a large-flow variable-frequency pump and a small-flow servo pump are simultaneously activated to avoid low frequency of the variable-frequency motor-pump set. For unstable liquid supply during work, open the unloading valve to unload the large flow pump, only the emulsion discharged from the small flow servo pump enters the hydraulic support until the working frequency of the large flow pump gradually increases to a stable frequency, close the unloading valve At the same time, the speed of the small flow servo pump is reduced to realize the stable liquid supply of the large flow pump; when the liquid demand of the hydraulic support is small, only the small flow servo pump is turned on. This application utilizes the displacement sensor in the push cylinder to provide real-time feedback and hydraulic monitoring of the running process of the support, to control the liquid supply volume of each pump in the system in advance, to stabilize the pressure of the emulsion pump station, to avoid severe impact, and to eliminate the long power of the hydraulic support. Hysteresis effect on pressure response during distance transfer.

Description

technical field [0001] The invention relates to a hydraulic support intelligent liquid supply pump station and a control method, belonging to the field of mine equipment. Background technique [0002] At present, my country's coal comprehensive mechanized production is developing from automation to intelligence. Shearer, hydraulic support and scraper conveyor are the three main equipments in fully mechanized coal mining face. When the support group of the working face works with the shearer and scraper conveyor in precise and stable cooperation, the hydraulic support and its liquid supply system can Whether it works stably and reliably is the key to efficient and safe production in coal mining face. Faced with such a large-scale system and complex and variable load conditions, the current liquid supply system of the fully mechanized mining face in coal mines still has a multi-pump system that is difficult to quickly respond to the timely liquid demand of the support of the ...

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Problems solved by technology

At present, the emulsion pump station of the hydraulic support mainly has the following problems: (1) The existing liquid supply system uses frequency conversion to adjust the output flow of the emulsion pump. The response speed of the high-power frequency conversion system is not fast enough, and the flow control resolution is not high, so it cannot be accurately matched. The real-time liquid demand on the surface leads to severe pressure shock of the system and serious damage to system components; (2) When the side guard cylinder, balance cylinder and other small flow actuators of the hydraulic support are working, it is still necessary to turn on the frequency conversion motor to drive the large flow pump to work, resulting in A large amount of emulsion overflows through the overflow valve, wasting energy; (3) long pipelines are used to supply liquid between the pump station and the hydraulic support of the working face, coupled with the variable load characteristics of the working face, it is difficult for the liquid supply system to obtain the load accurately and in time Changes and real-time demand information, there is a prominent problem that the flow pressure output control of the liquid supply system lags behind the actual working power demand of the hydraulic support, which seriously affects the cooperative work of the working face equipment

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