It is the use of variable pump speed rotation of the rotor to transfer momentum to the gas molecules, and thus obtain the orientation speed, so as to be compressed, is driven towards the exhaust port of the preceding stage is drawn away after a vacuum pump. This pump concrete can be divided into: 1) the traction molecular pump gas molecules with high-speed movement of the rotor relative to the collision and get momentum variable pump, are driven to the outlet of the pump. 2) turbo molecular pump by high-speed rotation of the rotor blades and the stationary blade with each other to achieve a given pumping. Such pumps are typically operate at the molecular flow state. 3) It is a series of composite molecular pump and towed by two turbo molecular pump of a complex molecular pumps combine rotary joint center pump housing and a mandrel composed by variable service call., Housing is mounted in the upper the mandrel body is installed on the lower body. Opened and an equal number of annular grooves tubing mandrel, from housing to the hydraulic oil through the oil sump motor running from a vertical hole flowing mandrel, so even with the upper part of the body shell continuously variable rotary pumps Care ., grooves on the mandrel and the oil port can also be kept open on the housing. Hydraulic oil can freely in and out. Failure to timely replace the filter hydraulic oil filter can lead to the opening of the bypass valve, hydraulic oil due to unfiltered impurities in the oil directly into the center of the sliding surface of the rotary joints, seals damage on it, the machine due to the pressure side of the oil leak caused when walking speed is not the same on both sides of the travel motors, resulting in a machine running deviation. Remedy is: rotary joint replacement center seal; hydraulic oil and filter replacement. Variable variable pump pump maintenance ._ _ Jinan crystal by crystal Chong Chong hydraulic Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!