The oil temperature of hydraulic grab is too high

When using the hydraulic grab, if you do not pay attention to the oil temperature, too high will lead to the deterioration of the hydraulic oil and shorten the service life. The principle of the electro-hydraulic grab is to drive the work through electric energy, so as to complete the loading and unloading work. But what if the oil temperature is too high when used?
Condition 1 that causes the oil temperature to rise: unreasonable design of electrohydraulic grab bucket. Grasp the material, once the material resistance is greater than the digging force of the grab, although the grab can not grasp the material, but in the material pile "smothered" but the grab motor is still rotating, and even the motor "blocked" in order to protect themselves, the hydraulic system is equipped with an overflow valve. At this time, the pump through the relief valve high pressure overflow, the oil temperature rises sharply. Energy is conserved, electrical energy becomes heat, heating oil.
Condition 2 that causes the oil temperature to rise: unreasonable design of the electro-hydraulic grab bucket. During loading and unloading operations, due to the operator's experience or line of sight, the hydraulic grab continues to press the handle after it is closed, so that the grab is closed again (common situation). At this time, the motor of the grab bucket is still rotating, the motor appears "blocked" hydraulic pump through the relief valve high pressure overflow, and the oil temperature rises sharply. Energy is conserved, electrical energy becomes heat, heating oil.
1. Hydraulic grab work can not be tested. It's not safe. Hydraulic grab oil temperature is too high harm such as hydraulic oil viscosity. Volume efficiency and hydraulic system work efficiency decline, leakage increases, pressure protection can not be maintained, light grasping force is small or can not grasp the goods, poor reliability, heavy grasping goods fall, unsafe.
2. Production is affected. High oil temperature of hydraulic grab affects loading and unloading efficiency.
3. The parts of the hydraulic system expand due to overheating, destroying the normal coordination gap of the relative moving parts and increasing the friction resistance. The hydraulic valve is easy to jam, while thinning the lubrication film. Increased mechanical wear leads to pump. Valve, motor and other precision mating surface due to premature wear failure or scrap.
4. Vaporization of oil. Evaporation of water, easy to produce acupoint corrosion of hydraulic components; The oxidation of oil forms colloidal deposits, which are easy to block the small holes in the oil filter and hydraulic valve, so that the hydraulic system can not work normally.
5. Accelerate the aging and deterioration of rubber seals, shorten the service life, and even lose its sealing performance, making the hydraulic system seriously leak.
6. The hydraulic grab oil temperature is too high, which will accelerate the deterioration of hydraulic oil and shorten the service life.
7. Although the grab is now accepted by many people, the failure rate is still relatively high. If the oil temperature is too high, it will affect the normal operation of the machine and shorten the service life, thereby increasing the maintenance cost and the cost of buying new products in the later period.