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What are the common faults of concrete mixing plant

Author: admin Release time: August 14, 2017 Number of visits:

Cylinder failure
(1) The internal and external leakage of cylinder is generally caused by eccentric installation of piston rod, insufficient supply of lubricating oil, wear or damage of sealing ring and sealing ring, impurities in cylinder and damage of piston rod. Therefore, in case of internal and external leakage of the cylinder, the center of the piston rod should be readjusted to ensure the coaxiality between the piston rod and the cylinder barrel; the reliability of the oil atomizer must be checked frequently to ensure the good lubrication of the actuator; when the sealing ring and sealing ring are worn or damaged, they must be replaced in time; if there are impurities in the cylinder, they should be removed in time; when there are scars on the piston rod, they should be replaced.
(2) The insufficient output force and unstable operation of the cylinder are generally caused by the piston or piston rod being stuck, poor lubrication, insufficient air supply, or condensed water and impurities in the cylinder. Therefore, the center of the piston rod should be adjusted; whether the oil mist eliminator works reliably and whether the air supply pipeline is blocked should be checked. When there is condensate and impurities in the cylinder, it should be removed in time.
(3) The poor cushioning effect of cylinder is generally caused by wear of buffer seal ring or damage of adjusting screw. At this time, replace the sealing ring and adjusting screw.
(4) The damage of piston rod and cylinder head of cylinder is usually caused by eccentric installation of piston rod or ineffective buffer mechanism. Therefore, the central position of the piston rod should be adjusted; the buffer seal ring or adjusting screw should be replaced. Folding reversing valve failure: valve can not reverse or reverse slow action, gas leakage, solenoid pilot valve failure.
(1) The reversing valve can not reverse or the reversing action is slow, which is generally caused by poor lubrication, spring stuck or damaged, oil or impurities stuck in the sliding part and other reasons. In this regard, first check whether the oil mist device works normally and whether the viscosity of lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the reversing valve, or replace the spring and the directional valve.
(2) After a long time of use, the valve core seal ring is easy to wear, the valve stem and valve seat are damaged, resulting in gas leakage in the valve, slow valve action or abnormal reversing. At this time, the valve seat and valve seat should be replaced.
(3) If the intake and exhaust holes of the solenoid pilot valve are blocked by oil sludge and other impurities, the sealing is not tight, the movable iron core is stuck, and the circuit is faulty, the directional valve can not be normally reversed. Before the iron core and three kinds of impurities should be cleaned. The circuit fault is generally divided into control circuit fault and electromagnetic coil fault. Before checking the circuit failure, the manual knob of the directional valve should be turned several times to see whether the reversing valve can normally reverse under the rated air pressure. If it can, the circuit is faulty. During the inspection, the voltage of the electromagnetic coil can be measured with an instrument to see whether the rated voltage is reached. If the voltage is too low, the power supply in the control circuit and the associated travel switch circuit should be further checked. If the directional valve can't reverse normally under the rated voltage, check whether the connector (plug) of the solenoid coil is loose or contact is not solid. The method is to pull out the plug and measure the resistance of the coil (generally it should be between several hundred ohm and several thousand Ohm). If the resistance value is too large or too small, it indicates that the electromagnetic coil has been damaged and should be replaced. The failure of folding components and pneumatic transmission components mainly include: oil mist device failure, automatic blowdown device failure, muffler fault, etc.
(1) The faults of the atomizer are: too small adjustment of the regulating needle, blockage of the oil circuit, air leakage of the pipeline, etc., which will make the liquid oil droplets unable to atomize. Therefore, it is necessary to deal with the blockage and air leakage in time and adjust the amount of oil dripping to about 5 drops / min. In normal use, the oil level in the oil cup should be kept within the upper and lower limits. The water deposited on the bottom of the oil cup should be removed in time. Air source failure
(1) Air compressor failure: check valve damage, piston ring wear serious, intake valve plate damage and air filter blockage. If you want to judge whether the check valve is damaged, just turn off the power supply after the air compressor stops automatically for more than ten seconds, and turn the large belt pulley by hand. If it can be turned around easily, it means that the check valve is not damaged; otherwise, the check valve has been damaged; In addition, it can also be judged from the exhaust port under the automatic pressure switch. Generally, after the air compressor stops automatically, it should stop exhausting after more than ten seconds. If the exhaust is kept until the air compressor starts again, it indicates that the check valve has been damaged and needs to be replaced. When the pressure of the air compressor rises slowly and accompanied by oil leakage, it shows that the piston ring of the air compressor has been seriously worn and should be replaced in time. When the intake valve piece is damaged or the air filter is blocked, the pressure of the air compressor will rise slowly (but there is no oil leakage). During the inspection, the palm of your hand can be placed on the air inlet of the air filter. If there is hot air pushing outward, it means that the air inlet valve has been damaged and must be replaced; if the suction is small, it is generally caused by the dirty air filter, the filter should be cleaned or replaced.
(2) The faults of the pressure reducing valve are: the pressure can not be adjusted high, or the pressure rises slowly. If the pressure is not adjusted high, it is often caused by the rupture of the pressure regulating spring or the rupture of the diaphragm, so it must be replaced; the pressure rises slowly, which is generally caused by the blockage of the filter screen, so it should be removed and cleaned.
(3) Pipeline failures include: leakage at the pipe joint, hose rupture, condensation water accumulation, etc. In case of pipe joint leakage and hose rupture, the leakage position can be judged by sound, and it should be repaired or replaced in time; if there is condensate accumulated in the pipeline, it should be drained in time. The characteristic is that the condensate water is easy to freeze and block the gas path in winter in North China.
(4) The faults of compressed air treatment unit (TRIAD) are: oil water separator failure, pressure regulating valve and oil mist device failure. The faults of oil-water separator are divided into plugging and breakage of filter element and inflexibility of moving parts of drain valve. The filter element should be cleaned frequently to remove the oil and impurities in the blowdown.
The fault of pressure regulating valve is the same as "(2) failure of pressure reducing valve" above. The fault phenomena of the oil atomizer are: no oil dripping, water deposited at the bottom of the oil cup, and the sealing ring of the oil cup mouth is damaged. When the oil mist eliminator does not drip oil, check whether the air flow rate at the air inlet is lower than the fogging flow rate, whether there is air leakage, whether the oil volume regulating needle valve is blocked, etc.; if the water is deposited at the bottom of the oil cup, it should be removed in time; when the sealing ring is damaged, it should be replaced in time.