What is Hydraulic? A complete hydraulic system consists of five parts， namely， power components， the implementation of components， control components， no parts and hydraulic The role of dynamic components of the original motive fluid into mechanical energy to the pressure that the hydraulic system of pumps， it is to power the entire hydraulic The structure of the form of hydraulic pump gears are generally pump， vane pump and piston 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 Control components (that is， the various hydraulic valves) in the hydraulic system to control and regulate the pressure of liquid， flow rate and According to the different control functions， hydraulic valves can be divided into the village of force control valve， flow control valves and directional control Pressure control valves are divided into benefits flow valve (safety valve)， pressure relief valve， sequence valve， pressure relays， ; flow control valves including throttle， adjusting the valves， flow diversion valve sets， ; directional control valve includes a one-way valve ， one-way fluid control valve， shuttle valve， valve and so Under the control of different ways， can be divided into the hydraulic valve control switch valve， control valve and set the value of the ratio control Auxiliary components， including fuel tanks， oil filters， tubing and pipe joints， seals， pressure gauge， oil level， such as oil 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 Hydraulic principle It consists of two cylinders of different sizes and composition of fluid in the fluid full of water or Water is called "hydraulic press"; the said oil-filled "hydraulic " Each of the two liquid a sliding piston， if the increase in the small piston on the pressure of a certain value， according to Pascal's 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 Based cross-sectional area of the small piston is S1， plus a small piston in the downward pressure on the F Thus， a small piston on the liquid pressure to P = F1/SI，Can be the same size in all directions to the transmission of "By the large piston is also equivalent to the inevitable pressure P If the large piston is the cross-sectional 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 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 suppress plywood， oil， extract heavy objects， such as forging History of the development of hydraulic And air pressure drive hydraulic fluid as the transmission is made according to the 17th century， Pascal's principle of hydrostatic pressure to drive the development of an emerging technology， the United Kingdom in 1795 Joseph (Joseph Braman ，1749-1814)， in London water as a medium to form hydraulic press used in industry， the birth of the world's first hydraulic Media work in 1905 will be replaced by oil-water and further World War I (1914-1918) after the extensive application of hydraulic transmission， especially after 1920， more rapid Hydraulic components in the late 19th century about the early 20th century， 20 years， only started to enter the formal phase of industrial 1925 Vickers (F Vikers) the invention of the pressure balanced vane pump， hydraulic components for the modern industrial or hydraulic transmission of the gradual establishment of the The early 20th century Constantine (G • Constantimsco) fluctuations of the energy carried out by passing theoretical and practical research; in 1910 on the hydraulic transmission (hydraulic coupling， hydraulic torque converter， ) contributions， so that these two areas of The Second World War (1941-1945) period， in the United States 30% of machine tool applications in the hydraulic It should be noted that the development of hydraulic transmission in Japan than Europe and the United States and other countries for nearly 20 years Before and after in 1955， the rapid development of Japan's hydraulic drive， set up in 1956， "Hydraulic I" Nearly 20 to 30 years， the development of Japan's fast hydraulic transmission， a world Hydraulic transmission There are many outstanding advantages， it is widely used， such as general Plastic processing industry， machinery， pressure machinery， machine tools， ; operating machinery engineering machinery， construction machinery， agricultural machinery， automobiles， ; iron and steel industry metallurgical machinery， lifting equipment， such as roller adjustment device; civil water projects with flood control the dam gates and devices， bed lifts installations， bridges and other manipulation of institutions; speed turbine power plant installations， nuclear power plants， ; ship deck crane (winch)， the bow doors， bulkhead valves， such as the stern thruster ; special antenna technology giant with control devices， measurement buoys， movements such as rotating stage; military-industrial control devices used in artillery， ship anti-rolling devices， aircraft simulation， aircraft retractable landing gear and rudder control devices and other
