THE DESIGN THAT THE MACHINA LIQUID PRESSES SYSTEM KP3500 type whole liquidses pressing to turn a dish type to drill machine is an our country the generation whole liquidses press big caliber engineering to drill machine especially, drill a hole the diameter can reach to a 3.5 ms, depth 120 ms.That machine adopts four motors to constitute Heng power back track to drive to turn dish first in the domestic, and adopt a liquid to press an urn to replace a Yang machine, rise weight big(can reach to a 1.2 MNs), speed quick, ascend and descend steady, can also be as occasion arise carry on adding to press to drill into.Should drill machine 1991 throw in the copper Ling usage in Yangtze River Bridge at the end of every year, authenticate through a construction department in 1992, henceforth again use in the tiger door of Guangdong the big bridge, the big bridge, Nanking Yangtze River of the Xiamen sea Cang in Fukien two bridges, Hubei Jing sand Yangtze River Bridge, Qian2 Tang2 Jiang in Zhejiang three the bridge etc. the national important engineering, because its efficiency is high, work steady but be subjected to construction the unit consistent good opinion, and have the honor of acquiring a construction department science and technology a progress accessit and national new product prize.Therefore, the design applies a dependable liquid to press system and drill the usage function of machine to the pass importance to assurance.1 liquids press the basic principle of system designMake use of an advanced technique at home and abroad and successful experience, the concrete usage which combines our country state of the nation and drills machine request.Try hard for in brief with apply, possibly the land utilization presses a component to carry out to drill various action that the machine have with the minimal liquid.So, can lower to break down occurrence all rate, raise energy utilization and drill the credibility of machine, lower a worker to labor strength.2 main oil road system 2.1 adjust soon way and liquid press a pump of choice The liquid presses adjust of system soon the way has already had no class to adjust soon with have class to adjust soon two major types.Have no class to adjust to soon have to adjust soon the scope be big, can adapt a dissimilarity to drill into the request of craft, but, change to measure control back track and liquid to press a pump to drive organization more complicated.KP3500 type whole liquidses press to drill machine to adopt 4 the set A7 V160 LV1 R Heng the power change to measure pump and 2 sets 2 QJM62-6.3 B low speed to greatly twist a Ju liquid to press motor to constitute Heng power to adjust soon system, have class to become soon with have no the class become to soon knot to put together and openned widely to adjust soon scope, and while adjust soon dont need to be reduce expenses and overflow to flow, the energy make use of more reasonable, efficiency Gao but have fever little. Because drill the machine construction geologic strata circumstance complications, load to much change, request to drill function with load of the variety automatically regulates to turns soon and turn Ju, but the Heng power change to measure system and can adapt a request of load the work condition, namely with load of increment, the system can automatically lower to turn soon and the aggrandizement turns Ju.Also can with maximum limit make use of the power of source motive, attain to the bestly drill into the effect.The A7 V160 LV1 R Heng power change the work characteristics of measure the pump is lie in it of row quantity can with load pressure of the variety automatically regulates with promise importation power close Heng settle value.If dont account an efficiency, the motor outputs power N then basically equals the power of pump importation, as well is Heng value, from the power formula of the motor N=the Mn/974 can know, N Heng in fixed time, M and n present a pair of curves relation, in the Heng power become under the control of measure the pump, along with load of variety, the motor outputs turn Ju M and turn soon an of n to press a pair of curves relation to automatically regulate, can satisfy a work condition request, it adjusts soon characteristic curve such as figure 1 show.Diagram 1 Heng powers change to measure a pump-the metered motor back track adjust soon characteristic curve 2.2 liquids press the choice of valve For satisfying high pressure, the need of big discharge, reduce a liquid to press build of system price, lift a high performance price ratio, we chose to use to put to pack valve.Put to pack valve to have to flow ability big, act speed quickly, combine function strong, seal completely sex like, structure tightly packed, anti- pollution the ability be strong and be easy to integration etc. advantage.Combine an adoption integration a piece, showed Zhao to let up size and weight.2.3 motors choose Engineering machine most requests to becom