What is the hydraulic cylinder for hydraulic press
The main cause of the piston seal overwear is that the speed control valve is misregulated, causing excessive backpressure and sealing parts or hydraulic oil pollution. The second is the quality of the material in the assembly and the sealing material. The result is that the action is slow and weak, and the damage of the piston and cylinder can be caused when serious, and the "pull cylinder" phenomenon occurs. The processing method is to adjust the speed control valve, and the control installation instructions should be done with the necessary operation and improvement. (2) leakage of hydraulic circuit. Includes valves and hydraulic pipe leaks. The repair method is through the control of the reversing valve and the leakage of the hydraulic connection line. (3) the hydraulic oil is passed by the overflow valve to the fuel tank. If the overflow valve enters the core of the dirty object, causes the overflow valve to be open, the hydraulic oil will flow directly to the tank by the overflow valve, causing the hydraulic cylinder to be free of oil. If the load is too large, the regulating pressure of the overflow valve has reached the maximum rating, but the hydraulic cylinder still can not get the push of the continuous action. If the adjustment pressure is low, the pressure is not enough to carry the necessary working force, the performance is not enough. The overflow valve should be checked and adjusted at this time.
A hydraulic cylinder is a hydraulic actuator that transforms hydraulic energy into mechanical energy, and is a linear reciprocating movement (or oscillating motion). It is simple and reliable. Use it to realize reciprocating motion, the speed reducer can be avoided, and there is no transmission clearance, the smooth movement, thus is widely used in all kinds of mechanical hydraulic system. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference between the two sides; The hydraulic cylinder is composed of cylinder and cylinder, piston and piston rod, sealing device, buffer and exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are necessary.
The hydraulic cylinder initial action is slow. In low temperature, the hydraulic fluid is large and the fluid is poor, causing the hydraulic cylinder to move slowly. Improved method is to replace glue good hydraulic oil temperature performance, can use in the low temperature heater heating or by machine itself to improve the oil temperature of startup, system normal working oil temperature should be kept at about 40 ℃. You can't drive the load at work The main reasons are: the stop-position of piston rod, insufficient thrust, falling speed, and unstable work. (1) internal leakage of hydraulic cylinder. The internal leakage of hydraulic cylinder includes hydraulic cylinder seal, piston rod and sealing gland seal and piston seal and the leakage of excess and so on. The reason of the piston rod and packing gland seal leakage, sealers crease, squeezing, tearing, wear, aging, metamorphism and deformation, etc., a new seal should be replaced at this time.
Piston rod and cylinder jam or hydraulic cylinder block. At this point, however, the hydraulic cylinder does not move or move very little. Then should check if the piston and piston rod seal is too tight, whether sediment into the dirt and glue: whether the axis of the piston rod and cylinder of the wearing parts and seal failure, whether the load is too big. (3) the hydraulic system controls the pressure too low. The resistance of throttle in the control line may be too large, the flow valve is misregulated, the control pressure is not suitable, the pressure source is disturbed. The control pressure source should be checked at this time to ensure that the pressure is adjusted to the system. (4) air in the hydraulic system. The main reason is that there is a leak in the system. At this time, the liquid level of the hydraulic tank should be checked, the sealing parts and the pipe joint of the hydraulic pump suction side, and the oil suction strainer is too dirty. If this is the case, the hydraulic oil should be replenished, the sealing and the connection of the pipe should be processed, and the coarse filter will be cleaned or replaced.
Hydraulic cylinder is the actuator that converts hydraulic energy into mechanical energy in hydraulic system. The fault can be generalized from the hydraulic cylinder, the power load and the piston slip or creeping. Due to the failure of hydraulic cylinder, the phenomenon of equipment stop is very common, therefore, the fault diagnosis and maintenance of the hydraulic cylinder should be taken seriously. Fault diagnosis and treatment False movement or malfunction There are several reasons for and how to handle it: (1) the core of the valve is jammed or 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 pollution of the oil should be checked. Check whether the dirt or colloid sediment is stuck or blocked valve holes; Check the body's wear and tear, clean, replace the system filter, clean the tank and replace the hydraulic medium.
