The cement self feeding mixer is composed of many parts, such as the chassis of the special vehicle, the upper tank, the hydraulic system, the subframe, the reversing valve, etc. The reversing valve also occasionally fails, such as the valve cannot reverse or the reversing action is slow, gas leakage, and the electromagnetic pilot valve has faults. The following brief section will introduce the solutions to these faults.
1. The change-over valve of the cement self feeding mixer can not change direction or the reversing action is slow, which is generally caused by poor lubrication, stuck or damaged springs, and stuck sliding parts by oil or impurities. At this time, we should first check whether the operation of the oil atomizer is normal and whether the viscosity of the lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the reversing valve, or replace the spring and reversing valve.
2. After being used for a long time, the reversing valve of the cement self feeding mixer is prone to wear of the valve core seal ring, damage of the valve stem and valve seat, resulting in gas leakage in the valve, slow action of the valve or abnormal reversing and other failures. At this time, it is necessary to replace the sealing ring, valve rod and valve seat, or replace the reversing valve.
3. If the inlet and outlet holes of the solenoid pilot valve are blocked by oil sludge or other impurities, the sealing is not tight, the movable iron core is stuck, and the circuit has faults, etc., the directional valve can not reverse normally. For the first three cases, the oil sludge and impurities on the pilot valve and movable iron core should be cleaned, and the circuit faults can generally be divided into circuit faults and solenoid coil faults.
Before checking the circuit fault, turn the manual knob of the reversing valve a few times to see whether the reversing valve reverses normally under the rated air pressure. If it can reverse normally, the circuit is faulty;
During the inspection, the instrument can be used to measure the voltage of the solenoid coil to see whether the rated voltage is reached. If the voltage is too low, further check the power supply in the control circuit and the associated travel switch circuit.
If the reversing valve can not reverse normally under the rated voltage, check whether the connector of the solenoid coil is loose or not in contact. Check method: unplug the plug and measure the resistance of the coil (generally between several hundred ohms and several thousand ohms). If the resistance is too large or too small, the solenoid coil is damaged and needs to be replaced.
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