Solenoid circuit fault and fault types

If the solenoid pilot valve inlet, sludge and other vent is clogged, closed lax plunger is stuck, circuit failure, can lead to valve can not be normal commutation. The former three cases should be cleaned on the core activities of the pilot valve and the sludge and impurities. Cement silo failures are generally divided into the solenoid control circuit faults and fault types. After checking circuit fault, should first manual valve knob a few turns to see the rated pressure valve is working correctly for commutation, if normal commutation, then the circuit is faulty. Inspection, the available instrument measuring the voltage of the solenoid, to see whether the rated voltage, if the voltage is too low, should further examine the power control circuit and the concrete block making machine circuit. If the valve is not properly rated voltage commutation, you should check the solenoid connector (plug) is loose or exposure is not true. Method is to unplug it, measure coil resistance (should generally be in the hundreds of ohms to several thousand ohms), if the resistance is too large or too small, indicating that the electromagnetic coil is damaged and should be replaced.

mixing valve failure

Valve failure are: valve can not commutation or commutation slow, gas leaks, solenoid pilot valve is faulty and so on.
(1) valve commutation or commutation can not slow, usually due to poor lubrication, the spring is stuck or damaged, oil or impurities stuck sliding parts and other causes. In this regard, you should first check the lubricator is working properly; lubricant viscosity is appropriate. If necessary, replace the oil, clean the sliding valve parts, or replace the springs and valve.
(2) after prolonged usage valve steel cement silo  prone to wear and tear, stem and seat damage phenomena, leading to gas leakage inside the valve, the valve motion is slow or does not change to the other failures. At this point, you should replace the seals, stem and seat, or valve replaced.
(3) If the solenoid pilot valve inlet, sludge and other vent is clogged, closed lax plunger is stuck, circuit failure, can lead to valve can not be normal commutation. Wheel Loader three cases should be cleaned on the core activities of the pilot valve and the sludge and impurities. The circuit failures are generally divided into the solenoid control circuit faults and fault types. After checking circuit fault, should first manual valve knob a few turns to see the rated pressure valve is working correctly for commutation, if normal commutation, then the circuit is faulty. Inspection, the available instrument measuring the voltage of the solenoid, to see whether the rated voltage, if the voltage is too low, should further examine the power control circuit and the associated limit switch circuit.

Mixing cylinder failure

Due to improper assembly and long-term use of cylinders, pneumatic actuators (cylinders) prone to internal and external leakage, insufficient output force and movement is not smooth, cushioning effect is bad, piston rod and cylinder head damage and other symptoms.
(1) Bolted Type Cement Silo , external leakage, usually due to the eccentric rod installation, lubricating oil supply shortage, seals and sealing ring worn or damaged cylinder and piston rod with impurities resulting from such injuries. So, when the cylinder occurs inside and outside leakage, re-adjust the center of the piston rod, piston and cylinder to ensure concentricity; should always check the lubricator is working and reliable, to ensure the implementation of components oiled; when the seal ring and seal ring ring worn or damaged, shall be replaced; if impurities exist in the cylinder, should be promptly removed; piston rod has scars should be replaced.
(2) lack of cylinder output force and concrete mixing machine not smooth, generally pistons or piston rod is stuck due to poor lubrication, air supply is insufficient, or a condensate tank and impurities and other causes. In this regard, should be adjusted to the center of the piston rod; checking whether the work lubricator reliable; supply line is clogged. When the cylinder memory condensed water and impurities, should be promptly removed.

mixing station failure

Valve failure are: pressure regulator is not high, or the slow pressure rise.
Pressure regulator is not high, often due to pressure regulator spring break or diaphragm failure and must be renewed; pressure rises slowly, usually caused because the filter is clogged, should be removed and washed.
Piping failures are: leaking pipe joints, hose rupture, condensate aggregation.
Leaking pipe joints and hose rupture up to judge the sound leak from the site, should be promptly repaired or replaced; if there is accumulating condensate pipeline, it shall promptly drained, is characterized by condensed water in the northern winter, easy to knot Ice and clogging gas.
Compressed air processing components (triplets) faults are: oil and water separator failure, regulator and lubricator failure.
Wheel Loader oil-water separator is divided into, filter clogging, breakage, drain valve moving parts moving parts is not flexible and so on. Concrete Mixing Truck clean the filter, remove sewage and impurities inside the oil.
Regulator fault with the "valve failure" identical.
Lubricator fault phenomenon: no drop of oil deposited on the bottom of the oil cup water, oil cup seal failures. When the mist does not drip, check the inlet gas flow rate is below the fog flow, leaks, clogged fuel adjustment needle, etc.; if the oil cup bottom sediment moisture, should be immediately removed; when seal is damaged, should be replaced.

mixing station compressor failures are

Check valve is damaged, badly worn piston rings, the intake valve is damaged and air filter blockage.
Concrete block machine the non-return valve damage, just ten seconds after the compressor automatically shut down, turn off the power, the hand plate moving large belt wheel, if can more easily turn a week, then the check valve is not damaged ; the contrary, non-return valve is damaged; Further, the pressure switch from automatic exhaust vent below the case to be judged, in general, after the air compressor should be shut down automatically after about ten seconds to stop the exhaust, If you have been in the exhaust until the compressor starts again when to stop, then the check valve is damaged, must be replaced.
When the pressure of the air compressor concrete block machine slowly and accompanied by string phenomenon that has been severely worn piston ring compressor, should be replaced.
When the intake valve is damaged or clogged air filter, but also make the air compressor pressure rises slowly (but no strings oil phenomenon). Checking, can be put to the palm of the air inlet filter, if the heated air out the top, then place the intake valve is damaged, must be replaced; if suction is small, usually caused by dirty air filters, Filters should be cleaned or replaced.

mixing plant control requirements

Each of the cylinders, control valves and motors by concrete mixing processes required to run the various cylinders, control valves and motor control must be accurate, stable and reliable.
Concrete Mixing Truck with automatic or manual mode, and the relationships between independent and mutually constrained.
The system has good anti-jamming capability and concrete mixing machine self-protection.
Through communication with the computer, you can display system status, fault alarm.

mixing station works

Concrete mixing station is divided into four parts: sand feed, powder (cement, fly ash, expanders, etc.) to feed, water and feed additives, transmission mixing and storage. Their workflow shown in Figure 1 , mixer control system power, into the human - machine dialogue operation interface, system initialization process, including the recipe number, grade of concrete, slump, the amount of the production side, etc. Asphalt Mixing Plant the weighing of each hopper, metering hopper for detected, the output signal feeding empty or filled material, prompting the operator to determine whether to start mixing control procedures. started sand, stone belt motor fed into the weighing hopper; open fly ash, cement tank valve, start the screw conveyor ash electromechanical cement to the weighing hopper; open positions and concrete mixing machine water control valve inflow of water and additive metering hopper. metering meet the set requirements on metering Doudou door, ingredients into the blender started mixing, to the set time to open the door mixer, concrete mixer truck into the material has been received within.