The energy-saving transformation of the injection molding machine is to make energy-saving technical changes to the high-energy parts of the injection molding machine. Early injection molding machines were fully hydraulic and the injection molding process was in a changing load state. According to statistics, the energy loss due to high-pressure throttling is as high as 36% to 68%, so the energy consumption cost is high. In the process of energy-saving transformation of injection molding machines, there are many precautions.
The search of pressure and flow signals, the special PLC of injection molding machine produced in Ningbo is generally marked with pressure and flow signal. At this time, the voltage and current signals of pressure and flow should be checked with a multimeter. The voltage signal is 0~10V, and the current signal is 0. ~1A, look at the voltage signal, is it appropriate, if it is not suitable, choose a signal with a larger current, because the signal of the current is proportional to the pressure, so the higher the pressure, the higher the utilization rate of the injection molding machine. Now that several injection molding machines have been modified to use one channel, a current signal is selected. According to the actual measurement, one voltage is between 0 and 10V, and the other current is between 0 and 1A. Therefore, two channels can be selected. In addition, some injection molding machines do not have these labels. This depends on the presence or absence of an ammeter. If there is an ammeter, look at the magnitude of the current signal and then take one of the large signals as the control signal for the injection pump.
The input and output of the power supply are searched. Generally, the oil pump of the injection molding machine is controlled by a relay, that is, the power supply is powered on, the relay is given a control signal, and then the self-locking is closed. The relay is always sucking and the pump is always running. In other words, as long as the input terminals R, S, T of the inverter are connected to the terminals of the original oil pump motor, that is, the output of the relay, in order to facilitate PLC control, a part of the power can be saved, if connected to the power supply, When the power is turned on, the inverter is powered on and connected to the relay. As long as the relay has no control signal, the inverter will be out of power. The output of the inverter can be directly connected to the pump motor.
What happens: When the power frequency is normal, the direction of the motor is normal. When the frequency is changed, the direction of the motor is opposite to the actual direction. The two phases in the phase sequence of the output line of the inverter can be reversed. When the power frequency is used, the direction of the motor is opposite to the actual direction. When the frequency is changed, the motor direction is normal, and the two phases in the phase sequence of the input line of the inverter can be reversed. When the voltage and current signals are not driven by the inverter, the signal line may be reversed, resulting in the inability to drive the inverter, and the reverse connection is sufficient.
When loading the machine, first make the line well, the incoming line R, S, T, the outgoing line U, V, W can not adjust the phase sequence, the incoming line is connected to the contactor of the oil pump motor, that is, the place where the original oil pump is connected, the frequency conversion The line is connected to the oil pump motor; the signal line is found: first look at the instruction manual of the injection molding machine, find the pressure proportional valve and the flow proportional valve from above, and then look at the size of the signal. The first letter of the pressure is P, the flow is the first in English. The letters are Q, and there are other cases.
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