By capping head above the pressure in the workpiece, the role of one-way mix is ??applied to the grinding pressure hydraulic repair, the second is to limit movement of the workpiece, the workpiece is only allowed to rotate around the center of rotation of the indenter. Fixed abrasive is bonded to the abrasive surface of the grinding wheel and abrasive road while rotating mixing machine hydraulic repair Which is better, the workpiece is rotated in the role of follower grinding force of testimony. Cooling water through the hole in the middle of abrasive, the inflow from the bottom up to the grinding zone road mix hydraulic repair calls to the processing area for cooling, and fall away from the workpiece and abrasive to wear debris. With respect to the mechanical transmission, hydraulic transmission is a new technology that originated in 1654 Pascal hydrostatic transmission principle proposed. It is a liquid as the working medium, to form a transmission of energy transfer through energy conversion device. Hydraulic has the following advantages: ① the working fluid can be piped into any position; ② actuator arrangement is not restricted road mix azimuth hydraulic repair factory, with convenient and flexible tubing connections can be arranged transmission mechanism; ③ hydraulic transmission can rotary motion into linear motion of the prime mover; ④ can easily achieve variable speed; ⑤ load control, speed control and direction control easy to implement, but also easy to centralized control, remote control and automatic control; ⑥ smooth vibration-free hydraulic drive ; ⑦ good lubrication conditions can increase the reliability of hydraulic components work and life; ⑧ hydraulic components conducive to achieving standardization, serialization and generalization. Therefore, hydraulic transmission has been widely used in various sectors of the national economy.