Hydraulic system and hydraulic support

Abstract

The invention discloses a hydraulic system and a hydraulic support. The hydraulic system comprises an oil tank, a pump station, a hydraulic stand column, a main valve body and an energy accumulator. The pump station is provided with an oil inlet and an oil outlet, the oil inlet communicates with the oil tank; the hydraulic stand column comprises a rod cavity and a rodless cavity which communicate with each other; the main valve body correspondingly communicates with the oil outlet and the oil tank, and the main valve body comprises a first working oil port and a second working oil port; and the first working oil port communicates with the rod cavity, the second working oil port communicates with the rodless cavity, and the energy accumulator correspondingly communicates with the oil outlet and the main valve body. According to the hydraulic system, the power of the required pump station is reduced, the volume of the required pump station is further reduced, and the pump station is convenient to mount; and the lifting speed and the descending speed of the hydraulic support can be effectively improved, so that the time required by the whole support moving process of the hydraulic support can be greatly shortened, and the support moving efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of mining equipment, in particular to a hydraulic system and a hydraulic support. Background technique [0002] The hydraulic support mainly supports the roof of the mechanized mining face, and is matched with the shearer and the scraper machine to complete the automatic mining of coal. The existing working face is equipped with a large emulsion pump station in the trough , adopt the centralized liquid supply method, and use it as the power source to make the hydraulic support complete all actions such as lowering, pulling, lifting and pushing. [0003] In the related technology, the speed of the shearer is getting faster and faster, and the moving speed of the centralized liquid supply hydraulic support has been unable to keep up with the traction speed of the shearer. This is because the distance between the pump station and the support is long and the There will be a pressure loss when the emulsion is tr...

AI Technical Summary

Problems solved by technology

In addition, due to the large area ratio between the rod chamber and the rodless chamber of the column, the pressure on the rodless chamber during the lowering process is small, and the back pressure of the pipeline is too large, so the lowering process is difficult to quickly and massively Liquid back, causing the traditional hydraulic support to take too long to lower

If the distributed liquid supply method is used, that is, each hydraulic support is equipped with a pump station, although this can reduce the pressure drop caused by the excessive length of the hydraulic pipe, but the space of the fully mechanized mining face is narrow, if the initial support of the support is to be satisfied Force and fast movement requirements, the power of the required pump station is relatively large, and it is difficult to install on the bracket

In addition, when the hydraulic support is pushed, due to the hysteresis of the emulsion, the use of a hydraulic cylinder will result in an inaccurate push distance and difficult straightening of the working surface

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