The main reason is that the piston ring wears badly, and the crankcase's lubricating oil (and possibly too much oil) runs out. At this time, the air compressor is also very inefficient. If the gas volume can be used, check if the oil is added too much; then add a good quality oil-water separator. Reciprocating piston air compressors play an extremely important role in the flexible packaging plastics industry. For example, when making a bag, it is used on a punching machine for air punching and punching; when printing plastic, it is also used on a cylinder to lift and lower the offset press roller. The reciprocating piston compressor has excellent performance, low noise, low fuel consumption and low specific power. However, it is easy to reduce the exhaust gas, high exhaust gas temperature, high oil temperature, knocking sound, piston stuck or biting in production. Stay and wait for the fault. The working principle of the reciprocating piston air compressor is generally that the reciprocating piston air compressor is rotated by the electric motor through the V-belt, and then the piston is driven to reciprocate through the connecting rod, so that the volume of the piston chamber composed of the gas valve, the piston and the cylinder changes. , to achieve the r of compressed air. The compressed air is compressed by the intercooler and finally enters the gas storage tank. The gas storage tank is mainly composed of a cylinder body, a pressure gauge and a safety valve, which can stabilize the pressure of the air pipeline and reduce the pressure fluctuation caused by the compressor working. If the internal compressed air exceeds the rated air pressure for some reason, the safety valve will automatically open to discharge the compressed air into the atmosphere to ensure safe operation. Our factory uses V-0.3/10 and W-0.6/10 air compressors produced by Fujian Compressor General Factory. The opening pressure of the safety valve is 1.05~1.08 times of the rated exhaust pressure. Of course, the opening pressure of the safety valve is different for air compressors of different specifications. Pre-production inspection Before starting the air compressor, it is necessary to check it to eliminate the hidden danger. The inspection before starting mainly includes the inspection of the power supply voltage and the inspection of the oil level. Power supply voltage: The fluctuation range of the power supply voltage is required to be about 5%. Oil level check: The oil level is generally 1/3 to 2/3 of the oil mark. When it is lower than 1/3 of the oil mark, the filtered oil of the same grade should be added in time. 13# compressor oil should be used in winter and 19# compressor oil in summer. SAE30 can be used at a temperature of 10 ° C or higher, and SAE 10 can be used at 10 ° C or less. Reduced exhaust volume 1. The reduction in oil-deficient exhaust is directly related to oil shortage. Once we were in production, the air compressor had a problem of reduced exhaust gas volume, which not only failed to raise and lower the press roller of the printing press, but also accompanied by a certain knocking sound. We first inspect the air muffler and clean it, then observe the oil level, find that the oil level is lower than 1/3 oil level, immediately add the same grade of oil, then start the power switch, try to open, still have Knocking. Later, the crankshaft, connecting rod, piston and cylinder of the moving mechanism components were dismantled and inspected. It was found that the crankshaft had cracks, and it was seen that it was broken quickly. It must have been short of oil for some time. Due to lack of oil, the moving parts are dryly rubbed, and the overload operation causes the parts to be damaged to varying degrees. We cleaned and grinded the moving parts of the damage, severely replaced them, reinstalled and tested the machine, the knocking sound disappeared, and the displacement was normal. It can be seen that the oil is absolutely indispensable, otherwise it will be endless. 2. The air noise filter and the tightness of the air valve are not good. The reduction of the exhaust volume is also related to the tightness of the air noise filter and the air valve. The air muffler filter must be cleaned up. Cleaning the dirt on the valve plate and the valve plate is beneficial to the air compressor to ensure the normal exhaust volume. The filter should be cleaned every 200 hours under normal conditions, and the valve should be cleaned every 500 to 800 hours. 3. The quality of the lubricating oil is not good. The poor quality of the lubricating oil will cause the piston ring to be sucked, thus reducing the amount of exhaust. Therefore, you should choose a high quality lubricant. After long-term work, the lubricant will contain impurities, dust, etc., so it is also filtered. Generally, the oil should be replaced every 500 to 800 hours, and the oil used in the previous time should be filtered. 4. Excessive exhaust gas temperature The high exhaust gas temperature will also cause the piston ring to be sucked, resulting in a drop in exhaust gas. As long as the temperature is lowered, the problem can be solved. There are two points to note here: (1) The ambient temperature should not be too high, generally not exceeding 40 °C. (2) If the gas valve leaks, the discharged high temperature gas will return to the cylinder. At this time, we should carefully check the gas valve, grind the valve plate or replace the valve plate to eliminate the air leakage phenomenon, so that it is possible to solve the problem of high temperature. Causes and countermeasures of the crash phenomenon Air compressors are also prone to crashes during operation. The cause of the air compressor crash is both from the electrical side and from the mechanical side. 1. Electrical reasons The electrical part of the air compressor is mainly composed of an electric motor and a pneumatic automatic switch. The pneumatic automatic switch is closed when the air compressor is operating normally. When the pressure of the gas storage tank reaches the rated exhaust pressure, the compressed air pushes the rubber, and the spring jumps through the jump bridge, so that the movable contact and the static contact in the bakelite seat are disengaged, the circuit is cut off, and the motor is stopped. Conversely, when the tank pressure is reduced to a certain value, the spring springs back, the circuit is turned on, and the motor is running. If the contactor C coil is not energized, the air pressure switch will not work, resulting in a crash. For example, when there is a phase loss, the power switch K cannot be closed, and the coil C is not energized, thereby causing a crash. 2. The mechanical reasons for the mechanical cause of the crash are: the connecting rod is broken, the piston is stuck in the cylinder and the piston assembly clearance is too large, too small. Most of the connecting rod breakage is related to overload operation, so overload operation should be avoided to avoid breakage of the connecting rod. At the same time, attention should be paid to the assembly clearance and lubrication status of the cylinder and piston.
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