Energy-saving control system of injection molding machine and operating mode of energy-saving control system

Abstract

The invention discloses an energy-saving control system of an injection molding machine and an operating mode of the energy-saving control system. The energy-saving control system of the injection molding machine comprises a monitoring unit, a sensor group, a data acquisition module, a data processing module and an output control module, wherein the monitoring unit is used for monitoring the operating mode of a motor group, an overflow valve group and a proportional overflow valve; the sensor group is used for acquiring the oil return flow of the overflow valves in the overflow valve group and the proportional overflow valve; the data acquisition module is used for acquiring the data of sensors in the sensor group; the data processing module is used for the data processing and instruction output of the data acquisition module, the monitoring unit and the output control module; and the output control module is used for controlling the rotating speed of motors in the motor group according to the monitored oil return flow of the overflow valves in the overflow valve group and the proportional overflow valve to achieve the energy-saving purpose. According to the energy-saving control system of the injection molding machine, the rotating speed of the motor is controlled according to the overflow valve group and the proportional overflow valve, and the oil return flow of the overflow valve group and the proportional overflow valve is reduced under the premise of ensuring normal operation of the injection molding machine, thereby achieving the energy-saving purpose.

Description

technical field [0001] The invention relates to an energy-saving control system of an injection molding machine and its working mode. Background technique [0002] At present, the issue of energy saving is the focus of all walks of life. In the industry where injection molding machines are used, there are two main ways to achieve energy saving: (1) Connect pressure and flow sensors in series on the main oil circuit, and record the injection molding machine at the first time. The change data of pressure and flow in each time period in the first cycle, based on the recorded data in the next cycle, adjust the speed and power of the main oil pump motor in each time period by adjusting the frequency output of the frequency converter, so as to achieve the purpose of energy-saving control; (2) By detecting the pressure of the hydraulic main circuit of the injection molding machine and the control voltage or current value of the flow proportional valve, it is used as a basis to cont...

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Problems solved by technology

[0003] The main disadvantages of the first embodiment are: (1) It cannot fully meet the requirements of the production process: the injection molding product will be affected by changes in the production process such as mold temperature, hydraulic oil temperature, barrel and screw temperature during production, that is, The production process of the same product on the same machine is not static. If the output of the oil pump motor is completely formatted, there will be insufficient or excessive pressure and flow during key steps such as mold clamping, injection, and melting, resulting in extended production cycles. Or completely unable to meet the production process requirements, product scrapping and other consequences; (2) There are human uncontrollable factors: the system is independent of the main control system of the injection molding machine, and the operator needs to manually turn on or off the energy-saving control when changing the mold or changing the process system, if the operator forgets to turn on or off the system, there may be a phenomenon that the production process does not match the existing control method or cannot save energy

[0005] 1) This system can only be applied to injection molding machines with proportional control of pressure and flow in the hydraulic system, and other ordinary injection molding machines without proportional control cannot be applied, so the application area is greatly reduced;

[0006] 2) It cannot fully match the actual load change of the actuator hydraulic system of the injection molding machine, and there are huge human experience factors:

The energy-saving system uses the main circuit pressure and the electric signal of the flow proportional valve as the only control basis, so in the case of multi-motor control, each motor cannot be controlled differently, but can only be increased or decreased uniformly; There are large defects in the control of multiple oil pumps, and it is impossible to achieve real energy saving

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