1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： Machine Tool Hydraulic System 学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日Machine Tool Hydraulic SystemHydraulic transmission There are many outstanding advantages, it is widely used, such as general industrial use of plastics processing machinery, the pressure of
2、 machinery, machine tools, etc.; operating machinery engineering machinery, construction machinery, agricultural machinery, automobiles, etc.; iron and steel industry metallurgical machinery, lifting equipment, such as roller adjustment device; civil water projects with flood control and dam gate de
3、vices, bed lifts installations, bridges and other manipulation of institutions; speed turbine power plant installations, nuclear power plants, etc.; ship from the deck heavy machinery (winch), the bow doors, bulkhead valve, stern thruster, etc.; special antenna technology giant with control devices,
4、 measurement buoys, movements such as rotating stage; military industrial control devices used in artillery, ship devices, aircraft simulation, aircraft retractable landing gear and rudder control devices and other devices.A complete hydraulic system consists of five parts, namely, power components,
5、 the implementation of components, control components, auxiliary components and hydraulic oil. The role of dynamic components of the original motive fluid is into mechanical energy to the pressure that the hydraulic system of pumps, it is to power the entire hydraulic system. The structure of the fo
6、rm of hydraulic pump is generally pump, vane pump and piston pump. Implementation of components (such as hydraulic cylinders and hydraulic motors) which is the pressure of the liquid can be converted to mechanical energy to drive the load for a straight line reciprocating movement or rotational move
7、ment.Control components (that is, the various hydraulic valves) in the hydraulic system to control and regulate the pressure of liquid, flow rate and direction. According to the different control functions, hydraulic pressure control valve can be divided into valves, flow control valves and directio
8、nal control valve. Pressure control valves are divided into benefits flow valve (safety valve), pressure relief valve, sequence valve, pressure relays, etc.; flow control valves including throttle, adjusting the valves, flow diversion valve sets, etc.; directional control valve includes a one-way va
9、lve , one-way fluid control valve, shuttle valve, valve and so on. Under the control of different ways, it can be divided into the hydraulic valve control switch valve, control valve and set the value of the ratio control valve. Auxiliary components, including fuel tanks, oil filters, tubing and pip
10、e joints, seals, pressure gauge, oil level, such as oil dollars. Hydraulic oil in the hydraulic system is the work of the energy transfer medium, there are a variety of mineral oil, emulsion oil hydraulic molding Hop categories.The role of the hydraulic system is to help humanity work. Mainly by the
11、 implementation of components turn pressure into a rotating or reciprocating motion. Hydraulic principle ：it consists of two cylinders of different sizes and composition of fluid in the fluid full of water or oil. Water is called hydraulic press; the said oilfilled hydraulic machine. Each of the two
12、 liquid a sliding piston, if the increase in the small piston on the pressure of a certain value, according to Pascals law, small piston to the pressure of the pressure through the liquid passed to the large piston, piston top will go a long way to go. Based cross-sectional area of the small piston
13、is S1, plus a small piston in the downward pressure on the F1. Thus, a small piston on the liquid pressure to P = F1/SI, Can be the same size in all directions to the transmission of liquid. By the large piston is also equivalent to the inevitable pressure P. If the large piston is the cross-section
14、al area S2, the pressure P on the piston in the upward pressure generated F2 = PxS2 Cross-sectional area is a small multiple of the piston cross-sectional area. From the type known to add in a small piston of a smaller force, the piston will be in great force, for which the hydraulic machine used to
15、 suppress plywood, oil, extract heavy objects, such as forging steel.The present invention relates to a hydraulic system in a machine, particularly suitable for the drive of a member, such as a machine tool cutter, which may be subjected to a suddenly increasing load.When the load on a hydraulically driven machine tool member, such as a slide or rotating tool, increases, the load on the hydraulic motor which drives the member increases accordingly. With this increased load, the pressure of the hydraulic fluid supplied through a pressure line by a pump to the inlet side
