When the motor stops rotating, the hydraulic reversing valve of the hydraulic press in the system is pushed into an inversely proportional position. The inversely proportional function of the hydraulic reversing valve of the hydraulic press in the figure is type O, that is, the closed brake pipe. At this time, the motor also has a tendency to rotate due to the inertia torque, so the Inner curve hydraulic motor The oil return port of the motor leads to a momentary high pressure (that is, it leads to destructive working pressure). The working pressure of this high pressure oil exceeds the linear working pressure of the speed control valve. According to the overflow effect of the speed control valve, the high pressure oil in the oil return port of the oil motor is discharged to the oil inlet of the motor according to the speed control valve.

Because the brake pipe is closed, Portland hydraulic motor When the motor is rotating, the oil inlet of the motor cannot be filled immediately, which will lead to suction. The working pressure oil from the oil return hole overflows to the motor oil inlet hole, which can ease the difficulty of motor suction and make up the oil for the oil inlet hole.

Since the oil motor can rotate in both directions, two speed regulating valves are set in the buffer control circuit. You can watch videos online according to your channel. The control circuit of DC transformer is mostly based on the basic concept of DC transformer of speed regulating valve, so the speed regulating valve is not simple and clear, but has a wide application range.

Buffer control circuit of hydraulic cylinder

The basic concept of the buffer of the hydraulic cylinder is the same as that of the oil motor. When the hydraulic reversing valve of the system hydraulic press changes speed, the inertia torque of the hydraulic cylinder will cause a momentary high pressure in the hydraulic cylinder due to its movement. This high pressure will be released according to the buffer valve to maintain the reliability of the hydraulic cylinder's movement.

As shown in the figure, when the hydraulic cylinder lands, the automobile relay 4 is powered on, and the rod cavity is fed with high pressure oil. However, due to the movement of the hydraulic cylinder and the inertia torque, the rod cavity is promoted to have high pressure in a moment, so this high pressure can be discharged according to the buffer valve 5.

     Oil motor The working pressure setting of 5 is smaller than that of core speed control valve 2, which sets the working pressure as the larger working pressure of the system, while buffer valve 5 sets the working pressure of the hydraulic cylinder, and the distance between the two working pressure values is not too large.