Causes of Temperature Rise in Hydraulic Stretching Machine

1. Insufficient Oil Tank Volume and Inadequate Cooling:

• The oil tank has a small volume, resulting in insufficient heat dissipation area. Either no oil temperature cooling device is installed, or the existing cooling device has a capacity that is too small.

2. Overheating Due to High-Pressure Flow through Relief Valve:

• When a fixed displacement pump supplies the oil system at the selected rapid advance speed, a significant portion of the flow operates under high pressure, leading to heating caused by overflow through the relief valve.

3. Faults in Unloading Circuit or Absence of Unloading Circuit:

• If the unloading circuit in the system malfunctions or is absent, the pump cannot unload the load properly during downtime. The entire flow of the pump then overflows at high pressure, resulting in overflow loss and excessive equipment temperature rise.

4. Excessive Pressure Loss Due to Small, Long, and Bent System Pipelines:

• The system pipelines are too narrow, too long, and have too many bends, causing significant local and along-the-way pressure losses.

5. Insufficient Component Precision and Poor Equipment Quality:

• Components lack precision, and the equipment quality is poor, resulting in significant mechanical friction losses during relative motion.

6. Inadequate Clearances in Fitted Components:

• The clearances in fitted components are either too small or, due to wear, have become excessively large, causing significant internal and external leakage, resulting in a loss of volume. Reduced volumetric efficiency of the pump can lead to rapid temperature rise.

7. Overly High Hydraulic System Working Pressure:

• Hydraulic system working pressure is adjusted much higher than necessary. This may be due to overly tight sealing or damaged seals, leading to increased leakage, necessitating higher pressure for operation.