The return spring of the reversing valve of the hydraulic press machine is not only insufficient elastic, but also has a skewed phenomenon, which causes the valve core of the reversing valve to fail to return to the original position after power-off, so the opening amount of the spool valve is too small, which plays a throttling effect on the oil through the reversing valve. The initial action of the cylinder is slow, and in the case of low temperature, the viscosity of the hydraulic fluid is relatively large, and the mobility is poor, resulting in the slow action of the hydraulic cylinder. If the outside temperature is really too low, it is possible to increase the oil temperature at start-up with the help of a heater or corresponding insulation measures.
Oil contamination should be checked, check for dirt or colloidal deposits to get stuck in the spool or orifice, and check for wear on the body. The throttling resistance in the control line may be too large, the flow valve may be improperly adjusted, the control pressure may be appropriately diverged, and the pressure source may be disturbed.
                                                                   
The hydraulic system of the hydraulic press machine controls the pressure too low.
The piston rod of the hydraulic press machine is stuck with the cylinder barrel or the hydraulic cylinder is blocked. The method of capping is to replace the hydraulic oil with good viscosity and temperature resistance in time.
If the outside temperature is really too low, it is possible to increase the oil temperature at start-up with the help of a heater or corresponding insulation measures. When the flow valve or directional valve core is stuck or the valve hole is blocked, the hydraulic cylinder is easy to malfunction or malfunction at this time. At this time, it should be checked whether the piston and piston rod seal are too tight, and whether dirt and colloidal precipitate have entered; Whether the axis line between the piston rod and the cylinder barrel is aligned, and whether the wearing parts and seals are failing. At this time, no matter how it is operated, the hydraulic cylinder does not move or moves slightly.
When the temperature of the hydraulic press is low, the viscosity of the hydraulic oil is relatively large, and the activity is poor, resulting in the slow action of the hydraulic cylinder. At this time, the control pressure source should be checked to ensure that the pressure is adjusted to the defined value of the system.
The main products of Delishi Hydraulic Machinery are fine servo hydraulic press machines, four column hydraulic presses, hot forging press,cold forging press, c frame hydraulic press, etc., The hydraulic press machines have been widely used in mobile phones, tablet computers, notebook computers and other smart wearable categories, as well as auto parts, household appliances and kitchenware, jewelry and handicrafts and other industries and products.
Because of the focus, so professional, our founder since the eighties of the last century began to specialize in hydraulic presses, our company inherited more than 30 years of state-owned enterprises in the manufacture of hydraulic press technology, engineering and technical personnel and skilled operators. At the same time, it will continue to improve, improve and perfect in combination with the development needs of the industry.

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• Hydraulic Press Machine