英文文献Hydraulic supports development and perspective1 domestic and foreign hydraulic support development outlineThe hydraulic support is take the high-pressured liquid as a power, by certain hydraulic element (cylinder, pipe accessory) one kind of support and the control roof mining coal working surface equipment which becomes with some steel work combination. Has the intensity to be high, the traveling speed is quick, supports and protections performance good, safe reliable and so on characteristics. Since the 20th century 50s, the hydraulic support has become the mining coal working surface core equipment gradually, in the world mainly produced the coal country to put in the massive manpower and resources and the financial resource carries on the research development to it. At present, tends to be mature take the hydraulic support as the main body supports and protections, in the world already the manufacturing several hundred kind of frames and the up to ten thousand kind of models hydraulic support, meets each kind of coal bed mining supports and protections need.On the century 60s, our country once had also developed 10 kind of hydraulic supports, for various reasons has not obtained the promoted application, the hydraulic support is in the development, the laboratory stage; the 70s from Britain, Germany, Poland, the former Soviet Union and so on mainly produce the coal country to introduce several 10 set of hydraulic supports successively. After the unceasing exploration, the use, the digestion and the summary, make each type the support, it is the beginning which the domestic product hydraulic support develops; the 80s hydraulic support research and development are in the innovation to enhance the stage, develops 30 kind of new frame one after another, makes the ZZ series, the XY series, the ZD series and so on different specification, and widely uses in the state-owned large and middle scale coal mines, obtains the good economic efficiency; 90s special hydraulic supports development obtains the rapidly expand, the mechanized shop net support, the water granulated substance backfill support, the reason support, the force support, puts goes against the coal support and so on to be published one after another; The present century along with the computer technology, the automated technologys popularization and the application, hydraulic supports control makes the breakthrough progress, gradually to the programmed control, the numerical control, the remote control and the automated control makes great strides forward.2 Domestic and foreign hydraulic support differenceThe domestically produced support in the technique of manufacture, the material quality performance, the processing craft, the control system and in the sealing property compares with the overseas advanced countries has the very big disparity.2.1 Processing manufacture aspectAccording to the related synthesis picks the engineers and technicians to reflect that the domestic product hydraulic supports processing technology, the service life, the operational performance, used the material quality so far not yet to achieve in 1979 to introduce 100 set of supports technical levels. If structural material: Germany uses the ST52 material its yield strength is 500 MPa, but our country uses 16 Mn material yield strength is only 350 MPa; Valve class: Overseas has used the copper alloy valve shell and the high strength stainless steel valve core, our country has been the 45# steel adds the superficial heat treatment; In processing craft: The overseas cylinder endophragm is duplicate plates, the domestic product for does not plate, causes the column premature to present the spot in the use process, scratches and so on seals to leak the fluid phenomenon, affects the supports and protections effect. The domestic product hydraulic support and the overseas productions hydraulic support compares the average to reduce 23 service lives.2.2 Control system aspectThe domestic product hydraulic support control systems research and development are at backwardness condition, restricted the support to move seriously supposes the speed the enhancement and the synthesis picks the economic efficiency the display. In the world several mainly produce the coal great nation to enhance the support control system achievement the synthesis to pick throughout the economic efficiency the important means that the 20th century 60s use manual controls the operating system straight; the 70s use the forerunner control system, along with it Britain first proposed that the development battery solution control system, the 80s tends to be mature; the 90s ladder company develops the entire working surface battery solution control system, follows Wister to cut down Liya - the Beiruite company to develop more advanced P - M3, P - the M4 battery solution control system. Present countries and so on US, Germany, Britain, Australia basically all are the pr