advantages of hydraulic press machine with servo system

Servo system for press machine

Servo system for press machine has 3 advantages compared with normal press machine, the first one is energy saving, the second is faster moving speed, the third is lower noise.

The biggest advantage of the servo system is energy saving, which can be achieved by controlling the flow rate of the flow pump and the speed of the motor.

Compared with the traditional hydraulic press system, the dedicated hydraulic servo system overcomes the disadvantages of high energy consumption. When the flow required by the system changes, the speed of the motor changes with the change of the flow command, which makes the discharge flow of the pump. It means the system will provide flow as much as operator wanted, not more and not less.

When the motor press machine needs a certain speed, the motor is driven to run at full speed. When the machine is in the process of picking up pieces, holding pressure or rapidly descending, the motor can be stopped, and then, when other actions are performed, The motor follows the speed command to operate, this will save lots of energy.

Normal hydraulic press machine plunger pump system determines the power according to the maximum pressure and maximum flow of the system, and the constant power pump system determines the maximum power according to the working conditions. The speed of the motor is constant. In fact, the process flow and loading and unloading time of the hydraulic press during work are far greater than the processing time, even as high as 5:1, which means that most of the time press is in a standby state, the motor runs idly, and the reactive power consumption is huge. In addition, the press is maintaining pressure. In the first stage, the required oil supply is small, and almost all the hydraulic oil returns to the oil tank through the overflow valve, which generates a lot of heat and wastes energy.

The servo system consists of servo driver, permanent magnet synchronous motor, servo high pressure pump, encoder, pressure sensor and so on. Through the double closed-loop control of pressure and flow, the pressure and flow required for the production of the hydraulic press can be accurately controlled, and the servo system can provide as much as the system needs, so as to eliminate the loss of energy consumption caused by high-pressure throttling.

Compared with the hydraulic press of the original system, the hydraulic press using hydraulic servo drive technology has almost no energy consumption when the motor is in the standby state in the stage of waiting for material and the slider is fast down. Under the working conditions of sliding empty down, slow down, working, pressure holding, etc., the servo is in the stages of low pressure and high speed, high speed and high pressure, and high pressure and low speed respectively, and there is a large space for energy saving. Especially in the pressure-holding stage, due to the unique adjustment characteristics, the motor is maintained at almost zero speed, which greatly reduces energy consumption, and the energy consumption of the entire operating cycle can be greatly reduced. Compared with ordinary motors, the power saving rate is approximately 30%-60%.