Application scope:
Injection molding machine
Overview:
Electro-hydraulic servo is the main trend of the current development of injection molding machine technology, because the traditional injection molding machine uses a fixed-speed motor to drive the quantitative pump, so the output flow of the pump is constant, but the flow requirements of each action in the injection cycle are Differently, the excess flow is returned to the tank through the flow valve and the pressure valve, which results in the waste of electrical energy. The maximum cost of the injection molding machine is electricity. Therefore, energy conservation and consumption reduction have become an important trend in the development of injection molding machines.
System composition:
Time AC asynchronous servo controller, AC asynchronous servo motor, hydraulic pump, pressure sensor
Time Technology electro-hydraulic servo system features:
ï¬ Double closed-loop decoupling control is used to monitor and adjust the output torque and speed of the motor in real time. The response time is short. â— The pressure and flow valves of the traditional hydraulic system are cancelled. Simplify the system. 0-200Hz wide-band speed regulation is available. Speed ​​self-locking function, can maintain large torque output for a long time at zero speed, and ensure that the pressure after clamping is maintained.
ï¬ It is not necessary for the upper computer to process the pressure feedback signal to control the pressure and flow of the system. The upper computer can also execute the control command after processing the pressure feedback signal. â— The motor and oil pump are integrated to facilitate the installation. â— The cost is 10% lower than the AC synchronous electrohydraulic servo control system. 20%
Performance comparison:
According to the above comparison, the full electric energy-saving rate is the highest, but the technical difficulty is great, and the price and maintenance cost are high. Electro-hydraulic servo system is the main trend of current injection molding machine technology development, and is also the fastest way to form large-scale production. The performance of asynchronous electro-hydraulic servo system is the same as synchronous servo performance, but the price is lower and maintenance is easier.
Connection diagram: