There are two main reasons for the medium-sized concrete mixer excessive water supply error: one is the reason of the water supply system itself, such as the action error of the contactor, the air leakage of the water suction pipe, the water leakage and ineffective movement of the bottom suction valve, and the change of the resistance of the drain pipe, etc.; the other is the external Reasons, such as fluctuations in power supply voltage and changes in the frequency of self-generated power will cause changes in the speed of the pump motor, making the water supply unstable. In addition, the height change of the water level of the reservoir will change the height of the warm water of the water pump, which will also cause the water supply to be unstable.
In order to solve the excessive water supply error, on the one hand, corresponding measures should be taken for the above reasons, such as: choose a qualified suction bottom valve, and try to make it vertically downward when installing; the mixer should be as close as possible to the transformer, and the line section should be reasonable; the water level of the reservoir Change as small as possible etc.
On the other hand, it is changed to the metered water supply of the water tank, that is, the electrode-inserted quantitative water supply device is used (see Figure 2 for the control principle), and its action process is: BI--B2 is the water supply level. When the water level in the water tank is lower than BI-B2, The intermediate relay DL has no power, the contactor DJ of the water pump motor is energized, the water pump supplies water, the water level reaches B1-B2, DL operates, DJ is powered off, the water pump stops water supply, and B1 and B2 are self-locked through JD: press the water discharge switch to start water discharge The contact point F] of the solenoid valve releases water.
After the water is released, press the stop switch to drive the DJ to move, and the water pump supplies water again. At this time, the green light is on, and the red light is on when the water is full, and the water supply is stopped. It has been proved by practice that this device It works great.
