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The real-time curve of the parameters of the monitoring record is called out. In addition to the sharp drop in the oil pressure at the time of jumping, the parameters such as the secondary oil regulating oil are synchronously reduced, and the order cannot be distinguished.
Under normal circumstances, the external jumping signal 505 skipping signal enters the 003 system, causing the shutdown solenoid valve to lose power and stop, and issuing an emergency shutdown alarm. From this failure phenomenon, it can be judged that the jump is caused by the interlock signal that does not enter 003, and the jumping signal entering the 505 is first excluded. After systematic investigation, it was confirmed that the mechanical feedback head position of the critical security device and the mechanical deviation of the critical security device positioning system caused the unit to repeatedly miss the alarm.
Insufficient feedback head and flyweight clearance and shoulder clearance are likely to cause mechanical jumps. Generally, the shoulder clearance is 0.81.2mm. The flyweight clearance is 0.8lmm. After the large and medium repairs, it is easier to reassemble the front box and emergency breaker. Because the positioning position of the positioning pin and the screw itself is not accurate enough, and the asymmetric thermal expansion factor after the operation of the unit, the mechanical feedback head of the critical security device can be closer to the flying hammer, and it is in a non-connected state. When the unit is critical or dynamic high speed and high load, the unit jumps due to shaft vibration. The unit had been repaired at the end of 2008. Although the gap data was strictly measured after the repair, it was not possible to rule out the relative position of each mechanical part due to the lack of fastening and other reasons. Disintegration measured mechanical feedback head and shoulder clearance is less than 0.3! Obviously not meeting the requirements. Reassemble the critical security device and rearrange the locating pin holes. After the treatment, the vehicle is verified, and the jumper is now editing the Levin air compressor to reduce the power consumption and noise. Fang Fusheng, Xuanhua, Ganzhou Cobalt and Tungsten Co., Ltd., the transformation of the 341000 air compressor in Ganzhou, Jiangxi, and the dismantling of the Bozhou Cobalt and Tungsten Co., Ltd. The supporting motor is a wound-type motor with a power of 130kW. The motor starts with a frequency-sensitive varistor to reduce the voltage, and the gas supply system and the regulating pipeline are arranged. 1. When the air compressor works, the noise is large and the power consumption is also high. After analysis, the reason for the high noise is that when the air pressure reaches the working pressure, the pressure regulator acts, causing the relief valve to close and emit a loud noise. When the air pressure is lower than the working pressure, the relief valve opens and makes a loud noise. The reason for the high power consumption is that the current is large when the motor starts. When the air pressure reaches the working pressure, the motor idles and the rotation speed does not change, and there is still a large no-load current.
In order to reduce the noise, the control air pipe is removed, and the pressure regulator does not work, so that the unloading valve is not controlled and does not work, thereby eliminating the influence of noise. On the interface of the working pressure device, the frequency conversion parameters are then modified to control the working pressure. In order to reduce power consumption, the original electric control cabinet was removed, the rotor circuit of the wound-type motor was short-circuited, and a 133 kW inverter was installed to control the motor. When the air pressure reaches the working pressure, the pressure sensor issues a command to make the frequency converter automatically reduce the motor frequency, the motor runs at a low speed, and is constant at the working pressure, achieving the purpose of constant voltage supply and air consumption to reduce power consumption.
After the air compressor is improved, after several years of use, it can save more than 50 electricity per year, and the failure rate of the equipment is significantly reduced, saving a lot of maintenance costs.
Editor Ye Yunjing improved 3108 air compressor Liu Yajun Wang Lijun Tianjin Jihua Chemical Co., Ltd. Tianjin Jixian 301900 two old-fashioned 308 air compressors produced in Nanjing, two-stage compression. In the summer operation period, the outlet temperature is too high. If the temperature exceeds 60, tap water must be used to relieve the danger of excessive temperature on the molecular sieve desiccant. Spray water 432 is needed every year.
The two air compressors are each equipped with a separate water cooler and oil separator. In general, there is always a cooler and oil separator in standby mode. By connecting two water coolers and an oil separator in series, recombining the piping can reduce the temperature of the gas sent out by the system.
For improvement, just add some old pipe elbows with a diameter of 108 and switch valves.
After the improvement was put into operation, the gas temperature was reduced from 65 to 351.
Equipment Management and Maintenance 2009, 10 Workshop Experience
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