XAHS365 and VHP750E air compressor troubleshooting

Father's old 365 and 750 day air compressor failure treatment Wang Min 1. The 365 screw air compressor overheated, the human 365 diesel engine driven single-stage twin-screw high-pressure large displacement air compressor, produced by the Swedish 38.0 company. It is often stopped by the air compressor in the operation. The machine sets the maximum exhaust temperature 120, which will automatically stop when it exceeds this temperature. The usual reasons are as follows: the environment is poor in ventilation and heat dissipation. If the obstacle is too close to the wall; there are other heat sources near the air compressor; the front door and the side door of the air compressor are open during operation, and the fan cannot form a strong air flow.

The radiator is clogged. When there is a lot of dust around the air compressor, the dust or sludge will stick to the outside of the radiator during transportation, and the internal copper tube will be easily blocked due to the accumulation of grease, which will affect the heat dissipation effect.

The oil filter is too dirty. The machine has an oil filter. When it is too dirty, the resistance oil cannot enter the compressor at the normal flow rate, and the compressor will heat up rapidly due to insufficient cooling oil. When the inlet and outlet oil pressure difference exceeds 0.183, the filter element should be replaced.

4 The cooling oil level is too low or the oil grade is wrong. This machine uses the manufacturer's special compressor oil, which may cause excessive temperature when using other grades of oil.

6 The oil cut valve failed. There is a fuel cut-off valve between the oil filter and the compressor. When the oil cut-off cannot be turned on, the temperature rises rapidly after the compressor starts, because it has no oil lubrication and cooling.

The oil separator filter is too dirty. If the filter element is too dirty, it will affect the circulation due to excessive oil resistance. When the pressure difference between the two ends reaches 0.3, the filter element should be cleaned or replaced.

The thermostat bypass valve is in the open position. The thermostat bypass valve is in the open position when the machine is cold, and gradually closes after the temperature rises. When it fails, it may be in the open position, and the cooling oil will no longer flow directly back to the air compressor through the radiator.

Exhaust pressure is too high. When the exhaust pressure exceeds the rated 12 MPa, the compressor and the diesel engine are overloaded and the temperature is automatically stopped. In this case, check and adjust the pressure valve and then check the diesel throttle control system.

750 electric single-stage twin-screw air compressor, produced by the United States 1叩6 heart company, often fails to stop automatically in the following operation. There are two reasons for this. It is the power supply grid factor. The machine comes with an undervoltage relay and a faulty phase relay protection device. When the grid voltage is lower than the rated voltage 420 by about 83, or the phase sequence of the power supply is incorrect and the phase power supply is out of phase, Automatic trip stop. The exhaust gas temperature is too high, and the cause of the malfunction is similar to that of the XAHS365 air compressor.

When the machine is suddenly shut down, the air inlet of the air compressor is injected outward. When the air compressor suddenly stops and does not open the exhaust valve exhaust gas in time, the air inlet is sprayed with cooling oil. At this time, check whether the oil shut-off solenoid valve is faulty. If it is normal, check the main exhaust pipe. Whether the check valve can be closed or closed in time is complete.

The exhaust pressure is too low. Check if there is any air leakage in each solenoid valve and pipe joint; check whether the disc valve is fully open in the workshop; check whether the upper limit of the pressure switch is normal.

Improve the exhaust valve oil and gas discharge path. The long-term exhaust of the exhaust valve will make the compressor main motor and the radiator stick to the grease, causing the cooling effect to drop and the temperature rises and stop. To this end, the exhaust valve can be covered with a 2 inch long diameter 2 inch hose, and the exhaust gas can be discharged from the bottom hole of the bottom plate to the outside of the air compressor. W.0436 measures to improve the machining accuracy of wire-cutting machine Li Liang several 0艮77400 anti-7725 wire-cutting machine tools can only be used for rough machining for a long time. After analysis and on-site inspection, confirm the axial movement of the wire storage tube of the guide wheel. The contact of molybdenum wire is unstable, and the saponification liquid is dirty, which is the reason for the low processing precision of the machine tool. Refer to the technical parameters of the CNC wire-cutting machine, the standard hexagonal prism is processed, and the longitudinal section size difference should be. The knife (1) is called the cross-sectional dimension difference. Considering the natural wear factor of the machine tool, it is considered appropriate to increase the machining accuracy of the machine to 0.015. After finding the cause, take the following improvement measures.

Replace the upper and lower guide wheels and the insulating sleeve between the guide wheel and the wire frame to ensure accurate positioning of the molybdenum wire during high-speed movement. Re-install the adjustment guide wheel bearing so that it has no play and is flexible. There should be no swaying during the operation of the upper and lower guide wheels, and there should be no whistling.

The coupling shaft is changed from the original two claws to the claws, and the motor shaft and the storage drum rubber are changed to polyurethane to enhance vibration damping and wear resistance. Re-install the wire storage tube, repeated debugging, the outer ring vibration of the roller 0.03 backlash 0.05 completely eliminate the axial turbulence.

The power transmission mode of the original conductive column is changed to the power transmission mode of the side end of the wire storage tube. Eliminate the phenomenon of ignition of the conductive column, so that the conductive wheel is not easy to wear, and the molybdenum wire is not easy to be wire-wound. Improve molybdenum wire motion accuracy and contact reliability. A flange connecting sleeve carbon brush holder is arranged on the side end cover plate of the wire storage tube, and the negative electrode of the high-frequency power source is directly connected to the carbon brush in the carbon brush holder, and then the carbon brush and the side end surface of the wire storage tube are spring-transferred. Press tightly to fully contact.

(4) Expand the saponification solution injection hole and expand the nozzle diameter from 2 mm to the rinsing strength of the large saponification solution. A bubble is added to the saponification tank, and the plastic and copper mesh are used to make a powder. Clean the nozzle and molybdenum wire frame every week and clean the filter magnet block every week.

After the implementation of the measures, the inspection of the 32 pieces of workpieces processed by the wire cutting machine tool, the tolerances are all in the order of 0.0080.015mm, fully meet the target of improvement, the investment is only 4 7 712099, No. 5, Biyi East Road, Xianyang City, Shaanxi Province, equipment management and maintenance 20,4