Hydraulic press is often equipped with a cooler as a cooling device to prevent the temperature from being too high. What causes the leakage of the cooler in long-term use?
Hydraulic press is often equipped with a cooler as a cooling device to prevent the temperature from being too high. What causes the leakage of the cooler in long-term use?
1、 Cooling performance degradation
The main reason for this failure is blockage and deposit retention on the cooling pipe wall, forming hard block and pipe scale, which reduces the heat dissipation and heat transfer function. In addition, insufficient cooling water, cooler water and air accumulation in the cavity will also cause the cooling performance to decline.
2、 Breakage
Due to the temperature difference between the two fluids, the thermal expansion of the oil cooler material will produce thermal stress or the inflow pressure will be too high, which may lead to the damage of relevant parts. In addition, in cold areas or winter, when the oil cooler is shut down at night, the freezing expansion inside the pipe will burst the cooling water pipe. Therefore, it is necessary to select materials that are hard to be affected by thermal expansion, and adopt deformation compensation structure such as floating head; in cold season, water in cooler should be drained every night.
3、 Oil and water leakage
Oil pressure machine oil leakage, water leakage, there will be outflow of white oil, discharge of water with oily phenomenon. It is caused by water leakage, water leakage at the end of the cooling tube, water leakage at the end of the cooling tube, or oil leakage at the end of the cooler. At this time, according to the situation, take measures such as replacement of seal and repair welding to solve the problem.
4、 Supercooling
The temperature and flow rate of the relief valve in the cooling circuit of the CNC hydraulic press changes with the load flow of the system, so the calorific value will also change. Sometimes it will produce supercooling and waste war. Let the system have a suitable oil temperature, the temperature control system can automatically adjust the cooling water quantity. If it is lower than the normal oil temperature, stop the cooler or even turn on the heater.
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