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      Suzhou Shengminglong Hydraulic Equipment Co.,Ltd

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      Tel: 0512-57640771

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      Email: kssml2006@163.com

      Website: www.lesico2017.com

      Address: no.11-5, Luyang Fuyang Road, Zhoushi Town, Kunshan City, Jiangsu Province


      The reason of affecting the speed of oil cylinder return

      2019-05-22

      The reason of affecting the speed of the return stroke of the oil cylinder of the servo numerical control hydraulic press:

      1. Details of valve core jamming or valve hole plugging. When the flow valve or direction valve core is jammed or valve hole is blocked, the hydraulic cylinder is prone to misoperation or action failure at this time. Check the contamination of the oil; check whether the dirt or colloidal deposit is stuck in the valve core or valve hole, and check the wear of the valve body.

      2. The initial action of the oil cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is relatively large and the fluidity is poor, which results in the slow action of the hydraulic cylinder. The improved method: change the hydraulic oil with good viscosity and temperature resistance in time. If the external temperature is too low, it can be improved by means of heater or corresponding insulation measures.

      3. When the temperature is low, the viscosity of the hydraulic fluid is relatively large and the fluidity is poor, which results in the slow action of the hydraulic cylinder. The improved method: change the hydraulic oil with good viscosity and temperature resistance in time. If the external temperature is too low, it can be improved by means of heater or corresponding insulation measures.

      4. The return spring of the reversing valve is not only under elastic force, but also skew, which causes the valve core of the reversing valve to fail to return to the original position after power failure, so the opening amount of the slide valve is too small, which restrains the oil flow through the reversing valve.

      5. The piston rod is stuck with the cylinder barrel or the hydraulic cylinder is blocked. At this time, no matter how to operate, the hydraulic cylinder does not move or moves very little. At this time, it is necessary to check whether the seal of piston and piston rod is too tight, whether dirt and colloidal deposits enter; whether the axis line of piston rod and cylinder barrel is aligned, and whether the wearing parts and seals fail.

      6. The control pressure of hydraulic system of hydraulic press is too low. The throttle resistance in the control pipeline may be too large, the flow valve may not be adjusted properly, the control pressure may not be appropriate, and the pressure source may be disturbed. At this time, check the control pressure source to ensure that the pressure is adjusted to the specified value of the system.

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