The reason why the hot press cannot drive the load during operation
May 16,2025
If the hot press machine shows symptoms such as inaccurate piston rod stop, insufficient thrust, decreased speed, and unstable operation during operation, it means that the hot press machine cannot drive the load. Let's take a look at the reasons behind this situation:
1. Internal leakage of hydraulic cylinder. Internal leakage of hydraulic cylinders includes leakage caused by excessive wear of the hydraulic cylinder body seal, piston rod and seal cover seal, and piston seal. The reason for the leakage of the seal between the piston rod and the sealing cover is due to wrinkling, squeezing, tearing, wear, aging, deterioration, deformation, etc. At this time, a new seal should be replaced. The main reasons for excessive wear of piston seals are improper adjustment of the speed control valve, resulting in excessive back pressure and improper installation of seals or hydraulic oil contamination. Secondly, there are foreign objects entering during assembly and poor quality of sealing materials. The consequence is slow and powerless movement, and in severe cases, it can also cause damage to the piston and cylinder, resulting in the phenomenon of "pulling the cylinder". The solution is to adjust the speed control valve and make necessary operations and improvements according to the installation instructions; Clean the filter or replace the filter element and hydraulic oil.
2. Hydraulic circuit leakage. Including leaks in valves and hydraulic pipelines. The maintenance method is to operate the directional valve to check and eliminate leaks in the hydraulic connection pipeline.
3. The hydraulic oil is bypassed back to the oil tank through the overflow valve. If the overflow valve gets stuck in the valve core due to dirt, causing the overflow valve to remain open, hydraulic oil will bypass the overflow valve and flow directly back to the oil tank, resulting in no oil entering the hydraulic cylinder. If the load is too large, although the regulating pressure of the relief valve has reached the rated value of ******, the hydraulic cylinder still cannot obtain the thrust required for continuous operation and does not move. If the adjustment pressure is low, it will not reach the required vertebral force due to insufficient pressure, resulting in insufficient thrust. At this time, the overflow valve should be checked and adjusted.
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