Analysis of the cause of the failure analysis found that the control method of the gas path has the following problems: the speed of the piston is not adjusted when the clutch is combined. Although the quick exhaust valve can ensure the rapid separation of the friction plates when the clutch is disengaged, the speed of the piston cannot be controlled when the clutch is engaged. When the solenoid valve is turned on, the piston moves at a rapid speed to push the friction plates together.
Thus, even if the gas pressure output from the air compressor reaches a predetermined value, since the volume of the cylinder instantaneously increases, the pressure in the cylinder does not reach the pressure required to transmit the torque for a short time, and the relative friction between the friction plates is generated until the input. The gas reaches a certain amount, the pressure in the cylinder rises to the requirement, and the slippage is required during this period. The longer the inflation time, the longer the relative slippage between the friction plates, and the more heat generated by mutual wear, thus the clutch The greater the damage. In addition, the high-speed bonding also brings a certain impact to the friction plate, which easily causes the friction plate to break and break.
It is difficult to ensure that the clutch is combined under normal pressure. The electromagnetic reversing valve is only controlled by hand. When each air compressor is turned on, it is necessary to ensure that the clutch is combined according to the set pressure. There must be a strict operation procedure, that is, the air compressor is started first, and the air compressor is operated for a period of time. After the pressure reaches the set value, the solenoid valve is turned on to make the clutch engage. If the operator does not operate according to the program, after the air compressor is turned on, the electromagnetic reversing valve is turned on when the gas pressure does not reach the set value. When the clutch is combined at a low pressure, the slip phenomenon occurs and the clutch is damaged.
Ignore the rational use of air compressors. The air compressor motor is always on regardless of the clutch phase or the coupling phase. In the separation phase, the clutch does not require compressed air. Even in the combined phase, only a large amount of compressed gas is required at the initial stage of the combination, and only a small amount of gas is required to make up for the leakage. Ignoring the rational use of air compressors will result in wasted energy. In addition, the gas produced by the air compressor is periodic, and the mechanical parts need to be frequently opened and closed, resulting in a decrease in equipment life.
Conclusion Pneumatic clutch is a component of vacuum extruder that must be paid attention to and monitored. Its performance and state restrict the efficiency of the entire equipment. There are many types and models of pneumatic clutches, which must be scientifically and reasonably selected according to the production requirements and actual conditions of the equipment. Installation and operation are non-negligible links for the use of pneumatic clutches. Only careful installation and strict operation can ensure the safe and effective operation of the pneumatic clutch. Pipeline control is a key aspect of pneumatic clutches, which requires comprehensive consideration and scientific design to meet the requirements of all aspects of the machine. For the newly added brick and tile equipment, it needs to be digested and absorbed, combined with the production practice to carry out technological innovation, and complement each other to make it have better performance. Pneumatic clutches also have certain deficiencies, such as noise and high cost. For the former, the muffler can be used to make up; for the latter, if the ordinary clutch of other equipment can also be replaced with a pneumatic clutch, and the air supply is concentrated, the cost can be greatly reduced.
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