The emergence and application of concrete mixer can provide a lot of convenience for various engineering construction, which is due to the mixer, which improves the operation efficiency of the equipment to a certain extent. What about the testing method of the tightness of the clutch piston of the concrete mixer?
Detection of the tightness of the clutch piston of concrete mixer when the loader cannot walk or the oil temperature is too high, it is necessary to judge whether the clutch piston is not tightly sealed or the oil pressure is insufficient. However, it is sometimes difficult to determine the cause of the problem by conventional testing methods, especially when there is no power supply, it is more difficult for the testing team to check the sealing ring of the installed transmission assembly.
At this time, the pneumatic valve can be used for testing. First remove the transmission control valve of the automatic feeding mixer (the assembled transmission should be installed before the control valve is installed), and then supply 0.6-0.8mpa to each oil hole of the transmission in turn. If a hole is filled with air, there is a "bang" sound, and the inlet metering pump has no or little air leakage sound, indicating that the corresponding clutch piston and cylinder barrel are well sealed.
If you can't hear the sound of the piston pressing the collision plate and the sound of air leakage is very loud, it indicates that the seal between the clutch piston and the cylinder barrel is invalid, and the seal should be replaced.
In addition, the reason for the damage of the concrete mixer clutch is that when the power shift transmission clutch is engaged, the hydraulic oil pressure overcomes the tension spring force to compress the collision plate. With the increase of hydraulic oil pressure, the conflict plate contacts with the metal plate and is gradually pressurized, so that the clutch can smoothly transmit the flywheel power to the input shaft of the transmission.
Every shift, the collision plate will collide with the steel plate, and the heat generated will be dissipated by the coolant. When the friction plate and steel plate become thinner, more hydraulic oil is needed to make them fully engaged, and the engine must be further accelerated. In this way, the sliding torque of the friction plate on the steel plate will be prolonged, and more heat will be generated by friction, which will increase the temperature of the hydraulic oil.
When the temperature is sufficient to change the function of the seals in the transmission, the transmission will leak internally. The internal leakage causes the increase of heat from two aspects: the high-pressure oil leaks through the damaged seal, making the oil temperature rise continuously.
Because of oil leakage, the hydraulic pump must deliver more oil to ensure the pressure required to engage the clutch, so that the clutch can be fully engaged, which also requires the engine to accelerate continuously, so that the hydraulic pump can produce more flow. Such a vicious cycle will inevitably lead to overheating or burning of the clutch until it is completely ineffective.
If the operator wants to ensure the operation function of the concrete mixer, it is necessary to protect all parts of the mixer. Only in this way can the equipment operate better. For more information, please visit www.zkhntjbj.com Com.