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Treatment scheme of abnormal running speed of hydraulic press

2023-10-19 08:31:10
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We know that the hydraulic press is through the hydraulic system to produce pressure, complete the limitation, zigzagging, folding, pressing a variety of production processes, the middle of the speed is very important, the speed is abnormal, the hydraulic machinery can not work. Suzhou Shengminglong oil pressure Equipment Co., LTD. Analysis of the treatment scheme of abnormal running speed of oil press.


First, the factors affecting the speed decline of the hydraulic press:


1. Hydraulic cylinder piston and other related accessories wear or leakage phenomenon


2. The pressure reducing valve in the speed regulating valve is stuck in the open position, and the flow rate through the saving valve decreases when the load increases


Ii. The main reasons for the creep of the fulfillment agency:


1. Air is mixed into the hydraulic system;


2. Because of the poor smoothness, the guide rail is not parallel to the axis of the hydraulic cylinder, the piston rod seal pressure is too tight, the piston rod zigzilla deformation and other reasons, resulting in the hydraulic cylinder operating stroke friction changes greatly and resulting in crawling;


3. In the oil-saving speed regulation system, the hydraulic cylinder has no back pressure or lack of back pressure, and the hydraulic cylinder speed changes when the external load changes;


4. The flow pulsation of the hydraulic pump is large, and the pressure pulsation of the system is formed by the oscillation of the relief valve, which is caused by the shaking of the input pressure oil of the hydraulic cylinder.


5. The valve port of the saving valve is blocked, the system leakage is unstable, and the pressure reducing valve in the speed control valve is not sensitive, resulting in unstable flow and creeping.


Third, the hydraulic press performance mechanism mechanical failure caused by the lack of hydraulic oil supply, the formation of speed instability:


1. The saving port of the saving valve is blocked, resulting in no small flow or small flow instability;


2. The spring of the regulating valve is too soft, so that the pressure difference before and after the saving valve is too low, resulting in the small flow through the regulating valve is unstable;


3. The pressure reducing valve in the speed control valve is stuck, and the pressure difference before and after the saving valve changes with the external load, which is often seen because the load is small when the small feed, resulting in the increase of the small feed.


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