What are the reasons that affect the return speed of the hydraulic cylinder

What are the reasons that affect the return speed of the hydraulic cylinder?
The return spring of the reversing valve of the hydraulic press not only has insufficient elastic force, but also has a skew phenomenon, which causes the spool of the reversing valve to fail to return to its original position after the power is turned off, so the opening of the spool valve is too small, which is very difficult for the oil passing through the reversing valve. Liquid plays a throttling effect.
The initial action of the oil cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is relatively large and the activity is poor, which leads to the slow action of the hydraulic cylinder. If the outside temperature is really too low, it is possible to increase the oil temperature at startup with the help of a heater or corresponding insulation measures.
Check the contamination of the oil; check whether dirt or colloidal deposits are stuck on the valve core or valve hole, and check the wear of the valve body. The throttling resistance in the control pipeline may be too large, the flow valve may be improperly adjusted, the control pressure may not be appropriate, and the pressure source may be disturbed.
Hydraulic press manufacturers
The control pressure of the hydraulic system of the hydraulic press is too low.
The piston rod of the hydraulic press is stuck with the cylinder barrel or the hydraulic cylinder is blocked. The way to cover it is to replace the hydraulic oil with better viscosity and temperature resistance in time. If the outside temperature is really too low, it is possible to increase the oil temperature at startup with the help of a heater or corresponding insulation measures. When the valve core is stuck or the valve hole is blocked, when the flow valve or the directional valve core is stuck or the valve hole is blocked, the hydraulic cylinder is prone to malfunction or malfunction at this time. The way to cover it is to replace the hydraulic oil with better viscosity and temperature resistance in time. At this time, it should be checked whether the piston and piston rod seals are too tight, whether dirt and colloidal deposits have entered; whether the axis line of the piston rod and the cylinder barrel is aligned, and whether the wearing parts and seals are invalid. At this time, no matter how the operation is performed, the hydraulic cylinder does not move or moves slightly.
When the temperature of the hydraulic press is low, the viscosity of the hydraulic oil is relatively large and the activity is poor, which leads to the slow movement of the hydraulic cylinder. At this time, the control pressure source should be checked to ensure that the pressure is adjusted to the delineated value of the system.
2. Status indication signals that hydraulic equipment relies on during diagnosis
When diagnosing faults in hydraulic equipment, we need to rely on some status indication signals to determine what faults have occurred. Under normal circumstances, a certain hydraulic fault will produce some kind of status indication signal. It is also possible that this kind of status indication signal is caused by several kinds of faults. Therefore, it is very important to choose which state indicating signal to diagnose the fault. Under normal circumstances, we will choose some easy-to-measure quantities as status signals, such as oil temperature, pressure and flow parameters.
① temperature. We can measure the temperature of the oil or the temperature of other equipment, and then compare it with the theoretical value under normal conditions to determine the system state of the equipment. When the hydraulic equipment system leaks and fails, the temperature of the oil will rise, which will affect the normal operation of other equipment. However, the hydraulic system itself will have many characteristics, these characteristics will make the temperature have a hysteresis effect. At the same time, when the hydraulic system is running, it will be disturbed by many external environments, so the obtained temperature cannot be accurately reflected. The real situation of the hydraulic system, so we often only use it as a reference when measuring the temperature. ② The flow and pressure of the hydraulic system. According to the relevant laws of physics, the pressure value can reflect some working conditions of the hydraulic system, and the dynamic pressure is a carrier of various state information, and its signal is easy to measure. it is good. At present, dynamic pressure is used as a special number for the condition monitoring of hydraulic system, and many researches in this area are carried out. The medium of the hydraulic system is oil, so the flow signal is also a rich carrier of state information. Therefore, analyzing the flow signal and extracting useful characteristic parameters can also realize the state monitoring and fault diagnosis of the hydraulic system.