外文资料In hydraulic system installment contamination controlPaper abstract：The hydraulic system pollution is a hydraulic pressure breakdown main reason, after in order to guarantee the installment the hydraulic system to be able the security, the reliable movement, in view of the hydraulic system installment proposed a series of concrete measures, achieve in the construction process contamination control1OutlineThe technology of hydraulic transmission gets swift and violent development after emerging in the 18th century. Today, the apparatus of hydraulic transmission is widely used in all trades and professions, reflect on the modernized large-scale production line particularly abundantly. The steel hot-rolled H section steel production line of horse, the volume 54 kL of the hydraulic fuel tank, 38 hydraulic motors, of different specifications hydraulic jar up to 717, only the hydraulic pipeline is as long as more than 20,000 meters.The technology of hydraulic transmission has its advantage that can't be compared, this is the main reason that it can develop rapidly , meanwhile, the apparatus of hydraulictransmission has its fragiles aspects, among them the ability to resist pollution is low is an outstanding weakness . According to the records of relevant materials, the hydraulic trouble has 70- 8 to cause by the pollution of fluid. It must keep the systematic cleanness to guarantee the normal , reliable operation of the hydraulic system.2 Danger and reason that the system pollutesPollutant sneak into behind the system can accelerate hydraulic wearing and tearing of part , grind , decrease , burn even destroy or cause the movements of the valve not to work or cause the noising. The pollutant will stop up the throttle hole of the hydraulic component or reduce expenditure in the chink , change the working performance of the hydraulic system, cause movements to lack proper care even not work at all, produce and act and cause the accident by mistake . The dust particle will accelerate the damage of the seal in the hydraulic jar, the superficial one is strained in the tube of jar, make it increase not to let out, thrust insufficient or movements are unstable, creep, the pace drop, produce unusual sound and vibration. Also may cause filter screen stop up, hydraulic pump suck oil to be difficult, go back oil to be smooth producing angry losing , vibration and noise, will puncture the filter screen becauseresistance is too big while stopping up seriously , totally lose the function of filtering, cause the hydraulic and systematic vicious circle.The reason why the system pollutes is numerous, according to producing mechanism in pollution, divided into 2 kinds:(1)Pollutant made , hidden in the installation in the system.(2)Pollution that is produced in the course of system work. Obviously, pollutant made , hidden in the installation of the system is mostly smear metal , burr , molding sand , coating , abradant , solid particle of welding dreg , rust one and dust etc., they relatively loud in danger in system, must strengthen management at this stage , control pollution, guarantee the hydraulic system after installing can run safly and reliably .3Pollution control in the hydraulic system is made and installed3.1 Pollution control that the hydraulic part is processedThe processing of the hydraulic part generally demands to adopt the law of " processes wetly ", all processing processes want , drip , add , lubricate liquid or cleaner , so as to ensure surface process quality.3.2 Washing of hydraulic component , partBefore the new hydraulic pressure one is assembled, theold hydraulic pressure one can be used through washing after being polluted, should accomplish the following several points in the cleaning process.1)Hydraulic pressure pieces of disassembly and assembly , wash , should go on among clean room to accord with the national standard, if there is operating room of conditions that can be filled and pressed, make the indoor pressure higher than outdoors, prevent the atmospheric dust from polluting. If restrain terms from, should operate one to isolate alone even , seldom allow hydraulic pressure assembly one and machining of one sometimes in the same room among the pincers workers, forbid decomposing and assembling the hydraulic pressure one in the open , in warehouse of sometimes the shed , incidental absolutely .The hydraulic pressure of disassembly and assembly is a hour, attenbant should wear fiber difficult work clothes , work cap that come off, in case fiber, dust, hair, scurf,etc. scattered to fall into hydraulic system cause artificial to pollute. Forbid operating one and smoking , taking food inside.2)The hydraulic pressure one should go on in washing the platform to wash special-purposly, if limited by the condition , guarantee cleanness degree of the temporary workingbench .3)The cleaner allows to use the kerosene , petrol and use the same hydraulic oil of trade mark of oil with hydraulic system work.4)The part after washing is forbidden to be polished with the cotton , flax , silk and chemical fibre manufactured goods, prevent the fiber coming off from polluting the system. Forbid with leather tiger to part blast air (leather tiger have dust particle ) too, can dry up the part with the clean and dry compressed air if necessary.5)Part wash , forbid , put in land , cement ground , floor , pincers worker platform and assemble workingbench directly, and should put into container with cover , pour into the hydraulic oil .6)Have already washed but the part that wouldn't be assembled should be put into and antirusted and saved in the oil, moist area and season especially should pay attention to antirusting.3.3 Pollution control in a piece of transportation of hydraulic pressureIn hydraulic component , package transportation , should pay attention to the dustproof , rain-proof , especially hydraulic pressure piece of marine transportation want , fight withrain-proof paper or plastic wrapping paper kind to pack to transport for long-distance, put right amount of desiccant , does not allow rainwater , sea water to be exposed to the hydraulic pressure one . Before casing and after unpacking , should check carefully whether the oil mouth is stopped up , stopped up firm with the stopper, to receive slight oil mouth of pollution take remedy in time , must decompose , wash to the hydraulic pressure one with serious pollution moreover.3.4 The fuel tank refuelsThe fuel tank must be checked its internal cleanness degree before fuel-injection, the one not up to standard will be cleared up ; Cleanness degree that the fluid should be examined it before being joined; Must not allow to pour into the oil the fuel tank directly through filtering at the time of fuel-injection.3.5 The system resumesAfter the system is pickled, developed, can link all components , pipelines on request the job return circuit . This course should pay special attention to being in charge of connecting and keeping a public place clean , finish joining , , try hard to avoid dismantling, should pay attention to , wrap up , well , guarantee , in charge of , connect with clean cloth if necessary , calibre pollute.4 SummaryHydraulic systematic pollution control runs through in the whole construction course, require operators every step should consider the measure of keeping a public place clean , reduce system pollute , guarantee the hydraulic system after constructing can run safly , reliably to the greatest extent.中文译文液压系统安装中的污染控制论文摘要：液压系统污染是液压故障的一个主要原因，为了确保安装后的液压系统能够安全、可靠运行，针对液压系统安装提出一系列具体措施，以达到施工过程中的的污染控制。