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The common faults are mainly the following five types:
Common failures of the gas source fault gas source occur in air compressors, pressure relief valves, pipelines, compressed air processing components, and the like.
(1) The common failure of air compressors is the failure of the check valve, the wear of the piston ring is severe, and the air intake valve is damaged and the air filter is blocked.
After the air compressor is automatically shut down for more than ten seconds, the power is turned off and the large tape wheel is moved by hand. If the rotation can be performed more easily, the non-return valve is not damaged, otherwise it is damaged; it can also be based on the automatic pressure switch. The exhaust condition of the exhaust outlet is judged below. If the compressor is always exhausted after it stops automatically, it will not stop until the compressor is started again. This indicates that the non-return valve has been damaged and needs to be replaced. When the pressure of the air compressor rises slowly and is accompanied by a phenomenon of helium oil, the piston ring of the air compressor has been seriously worn and should be replaced in time. When the air intake valve is damaged or the air filter is clogged, the pressure of the air compressor will rise slowly (but there will be no oil splashing). Place the palm of your hand on the air inlet of the air filter. If there is hot air to the top, it means that the air inlet valve is damaged and needs to be replaced; if the suction force is small, it is usually caused by the dirty air filter and should be cleaned or replaced. Device.
(2) Relief valve failure. Pressure adjustment is not high, often the regulator spring rupture or diaphragm rupture, must be updated; pressure rises slowly, generally filter plug, should be removed for cleaning.
(3) Line failure. When the joint leaks and the hose breaks, the location of the leak can be judged by sound. If the condensate is accumulated in the pipe, it is easy to freeze and block the gas path.
(4) Failure of the compressed air handling assembly. The water-separator filter element is clogged and damaged, and the moving parts of the drain valve are not flexible. Always clean the filter element to remove oil and other impurities from the drain valve. The oil mister does not drip oil, water is deposited on the bottom of the oil cup, and the seal of the oil cup mouth is damaged. Check whether the air flow at the air inlet is lower than the fog flow, whether it is leaking, and whether the oil volume adjustment needle valve is blocked.
Cylinder failure
(1) Leakage inside and outside the cylinder is generally caused by eccentric installation of the piston rod, insufficient supply of lubricating oil, wear or damage of the seal ring and the seal ring, impurities in the cylinder, and scratches on the piston rod. The center position of the piston rod should be readjusted. The reliability of the lubricator must be checked frequently to remove impurities in the cylinder. If there are any scars on the piston rod, new parts should be replaced.
(2) Insufficient cylinder output force and unsteady operation are generally caused by stuck pistons or piston rods, poor lubrication, insufficient air supply, or condensed water and impurities in the cylinder. The center position of the piston rod should be adjusted; the reliability of the oil mister working should be checked; if the gas supply pipeline is blocked, the condensed water and impurities in the cylinder should be promptly removed.
(3) The cylinder cushioning effect is poor, generally due to wear of the buffer seal ring or damage of the adjustment screw, the seal ring and adjusting screw should be replaced.
(4) The piston rod and cylinder head are damaged, generally due to the eccentricity of the piston rod or the buffer mechanism does not work, the center position of the piston rod should be adjusted in time, and if necessary, replace the buffer seal or adjustment screw.
Directional valve
(1) Can't change direction or change slowly. Should first check whether the oil mister is working properly; whether the lubricating oil is correct or not. If necessary, replace the oil, clean the sliding part of the reversing valve or replace the spring and reversing valve.
(2) Spool seal wear, valve plug and valve seat damage, gas leakage inside the valve, slow movement or normal reversing, should replace the seal ring, valve plug and valve seat, if necessary, replace the new reversing valve.
(3) The inlet and exhaust holes of the first conductive magnetic valve are blocked by mud and other impurities, and the closed valve is not closed tightly, and the active valve core is jammed and the circuit is faulty, etc., which can cause the reversing valve to malfunction. The dirt and other impurities on the first conductive magnetic valve and the movable spool should be promptly cleaned. Before checking the circuit fault, the manual valve of the reversing valve should be turned several times to see if the reversing valve can be normally reversed under the rated pressure. If the normal reversing is possible, the circuit is faulty. During the inspection, the instrument can be used to measure the voltage of the solenoid to see if it has reached the rated voltage. If the voltage is too low, the power supply in the control circuit and the associated trip switch circuit should be further checked. If the reversing valve cannot be normally commutated at the rated voltage, check that the solenoid's connector (plug) is loose or the contact is untrue. The method is to pull out the plug and measure the resistance of the coil (usually between a few hundred and several thousand ohms). If the resistance is too large or too small, the solenoid is damaged and should be replaced.
Auxiliary components
(1) The adjusting amount of the adjusting needle of the oil mister is too small, the oil circuit is blocked, the pipeline leaks, etc. will make the liquid oil droplets unable to be atomized, and the plugging and leaking parts should be treated in time to adjust the amount of oil drip to reach 5 drops/min or so. In normal use, the oil level in the oil cup should be kept within the upper and lower limits. The water deposited at the bottom of the oil cup should be promptly removed.
(2) Oil and moisture in the automatic drainer may not be automatically removed. Check and cleaning should be removed.
(3) When the muffler installed on the directional valve is dirty or blocked, it also affects the sensitivity of the directional valve. Always clean the muffler.
Mechanical failure At the discharge port on the powder dosing hopper, the cylinder-driven valve spindle is often jammed; the rotary vane valve driven by the rack cylinder is stuck so that it is not closed or opened. Therefore, the agglomerate of powder on the inner wall of the valve of the flap plate should be frequently removed.
What are the common faults in the mixing station?
The gas path system is the execution device of the action of the concrete mixing station. Its role is to timely switch the aggregate storage bins, the mixer discharge doors, and the cement unloading doors according to the instructions issued by the industrial microcomputer, and break the arches in the cement bins. Additives for air-blown agitation ensure accurate measurement of various aggregates, cements and additives, and complete the loading of finished products. Only the correct use and maintenance of the system can guarantee the high efficiency and good economy of the whole machine production.