The valve plate of the valve is one of the main wearing parts of the piston air compressor. It is very important to analyze the cause of the damage of the valve plate and take corresponding preventive measures to ensure the continuous operation of the air compressor and reduce the maintenance cost.
The cause of a piece of damage is the load bearing piston air compressor. In normal operation, the valve plate is mainly subjected to two kinds of loads.
One is a static load caused by gas pressure, and under the action of static load, the valve piece will be bent and deformed.
Since the pressure in the cylinder changes from a lower suction pressure to a higher exhaust pressure, and due to the pulsation change of the air flow itself, the load on the valve plate has the characteristic of pulsation circulation, under the action of the pulsating cyclic static load. The valve piece is prone to bending fatigue damage.
The circumferential crack generated by the valve piece at the average diameter of the force is exactly caused by this.
The second load that the valve plate is subjected to is the impact load.
When the air compressor is working, the valve flaps back and forth between the valve seat and the lift limiter to form an impact.
When the valve plate collides with the valve seat, when the two are in contact with the lift limiter at the air flow passage, the two are not in contact with the spring seat hole, so that the contact portion of the valve plate is subjected to the impact load. Bending deformation occurred in the untouched part.
Due to the small mass of the valve plate, the impact energy is not large, but the number of impacts is high. For example, a type of air compressor with a rotating speed can continuously reach the protection line.
Under the action of this small energy high-frequency impact load, the valve piece is prone to fracture failure, especially in the place where the stress is concentrated at the edge of the valve piece.
The valve spring damage valve also collides with the valve spring while striking the lift limiter.
Every time the compressor crankshaft rotates, the load on the spring changes from the pre-compression force when the valve is fully closed to the maximum compression force when the valve is fully open. Under this pulsating cyclic load, the spring also becomes the valve. One of the main consumables in the assembly.
For example, the air valve of a type air compressor adopts a ring-shaped corrugated spring (referred to as a wave spring in actual use), and the Xu Wei damages the original and the preventive measures piston air compressor valve and Yiyi Mu Yi Yiyi basin x The prisoner x and the righteous people wiped the public, the army reduced the basin one by one, and sent a Yiyi basin to the basin. A CNC grinding machine with Siemens system was often not ready for the sliding power module, that is, the servo system. The operation principle of providing the alarm ready signal to the turret is not caused by the servo alarm. By checking the ladder diagram and the electrical drawing, the motor drives the rotation and the transmission disk records the tool number.
Observe the fault phenomenon, as long as the alarm is due to the board number terminal of the servo system (the electric knife tower rotates, the numerical control system will alarm).
According to the electrical original machine over temperature signal) the output signal drives the contact of the relay to check this map, and the servo power supply terminal is ready to operate and the signal is transmitted to generate a 3F alarm.
Check the servo system and find the number D.) When the input is faulty, the lamp on the third axis of the board and the turret on the board rotate to become 60 alarms, and the servo system (sum total error) The light is on, the third axis is the warning light of the first axis of the machine board, and the axis motion axis is a rotating axis.
The cause of this failure should first be that no alarm is generated, indicating that there is a problem with the servo system of the turret, followed by a problem with the servo amplifier, and another possibility is that the servo inspection mechanism is normal, replacement and servo amplifier board. There is also no alarm signal that the control unit has failed and an error has occurred.
Due to the failure of the servo replacement, it is definitely a problem with the servo motor. It is easier to replace the module of the new servo system. We first replaced the shaft amplifier board and the motor to eliminate the fault.
Control panel, but the problem is not ruled out, and the alarm on the N1 board checks the fault of the servo system according to our maintenance experience. First, the lamp becomes the motor of the third axis. The over-temperature lamp should analyze the alarm information of the CNC system and the servo system. The alarm is lighted, which further proves to be the servo display. Observe the fault phenomenon carefully. According to the working principle of the servo system and the problem of the machine motor, remove the motor protection cover and find that the motor is really overheated, the electrical schematic of the bed, and the suspicious fault. Check and eliminate one by one. In the case where there is a short circuit between the windings of the motor and the replacement of a new motor failure condition, the interchange method is adopted, and the cause of the failure is finally confirmed, thereby eliminating.
Except for machine faults.
For example, a CNC lathe using Siemens sl system, a turret is not in place, and produced a replacement for Yin Chengling to author Tonglian Jilin North Jiekai Transmission Co., Ltd. Jilin This is an alarm generated by the meaning of the city Ningsong Road No. Editing Ye Yunpu] I am anxious to repair, in the middle of the country, there is often the problem that the guide surface of the wave spring and the lift limiter are too loose or too tight.
Excessive loose fitting causes severe radial runout and circumferential rotation of the wave spring. Over-tightening causes the wave spring to be stuck or even broken, causing the valve plate to damage the pull cylinder.
Damage to the spring is one of the main causes of damage to the valve.
The heat exchanger cooling effect is reduced. Under normal working conditions of the air compressor, the temperature of the exhaust gas depends on the heat exchange effect.
When using tap water to cool, after long-term operation, the tubes of the heat exchanger will slowly scale, the pore size becomes smaller and smaller, and the cooling effect becomes worse and worse, especially in summer, the secondary exhaust gas temperature can exceed the valve valve. The working condition of the leaf spring deteriorates, causing damage to the valve spring.
For other reasons, the repairman's maintenance technique is poor or the responsibility is not strong. It is not completely assembled according to the technical requirements of the valve assembly, causing the valve to leak.
After a period of use, the operating temperature of the gas valve rises due to gas leakage, and the valve plate is burned out.
(2) The cooling water enters the cylinder due to the tight seal of the water jacket of the cylinder or the gasket on the plane, or the failure of the intercooler to seal the cooling water pipe.
When the air compressor is working, the water in the cylinder will have a strong impact and damage the valve plate.
Second, measures to prevent damage to the wide film The valve of the oil-free lubricating air compressor, if it is a traditional annular valve, its wear is quickly cut.
It is best to use a mesh valve with a deadly male structure, or to change the guiding metal block (or column) on the ring valve lift limiter to a product filled with polytetrafluoroethylene, and the wide bottom sealing table is also filled with a polysilicon atmosphere. Sealing ring made of ethylene.
At the same time, the gas cabinet bombs are made of stainless steel spring wire.
The spring steel wire shall be subjected to corresponding heat treatment and flaw detection before leaving the factory to avoid the existence of minor defects in the steel wire to ensure the stability of performance and enhance its ability to withstand the pulsating cyclic load.
In order to reduce the impact of the valve plate and the lift limiter, the rubber can be embedded on the lift limiter or the spring force can be appropriately increased.
Regularly inspect and clean the air valve, repair the damaged surface of the valve seat and the lift limiter without reducing the strength, and replace the wearing parts in time (the valve spring if the spring of the air valve is broken, then All other springs of the valve should be replaced at the same time, so that the spring force acts evenly on the valve plate.
Improve the technical quality of maintenance workers, strictly comply with the assembly technical requirements when assembling the valve components, and prevent the occurrence of valve burnout caused by poor assembly of the valve.
Prevent the serious fouling of the heat exchanger and pre-treat the cooling water to minimize the hardness and the content of the hardness.
At the same time, pay attention to regular or continuous sewage discharge at the intercooler aftercooler and gas-liquid separator, so as to slow down the heat exchanger fouling and ensure its heat exchange effect.
When the cooling water is pretreated for various reasons, the heat exchanger system should be inspected frequently, and it is found that the heat transfer effect of the heat exchanger is poor (two specific performances are that the secondary exhaust gas temperature is too high), that is, cleaning should be performed.
Regularly check the sealing condition of the cylinder water jacket or cylinder plane and the integrity of the intercooler, and find that the problem is dealt with in time to avoid the strong impact of the cooling water entering the human red and damage the valve.
Author Tonglian Gezhouba Vocational Education Center Machinery Teaching and Research Section Hubei Yichang City, singularity, Li Xiangdong, 甫 甫 熬 熬 熬 倡 倡 倡 倡 倡 瞬 瞬 瞬 å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ å‘ , , The pneumatic nameplate marking machine is controlled by the industrial computer and powered by compressed air. It is widely used in the high-tech products of the mechanical manufacturing industry for character numbers and graphic printing on various nameplates.
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