The system pressure of the four-column hydraulic press is designed to be higher than the actual pressure, which not only increases the service life of the equipment, but also protects the hydraulic components from damage. Many people do not understand that it is easy to cause the pressure overload of the four-column hydraulic press when operating the equipment. As a hydraulic press manufacturer, Tianyu will introduce the impact of downforce overload on the four-column hydraulic press today and how to solve it?
Usually, the normal pressure of a four-column hydraulic press is 25MPa. In the normal production process, the pressure of the hydraulic press shall not exceed 25MPa. The working temperature of the four-column hydraulic press is usually 30-80 °C, and the oil temperature in the hydraulic system of the four-column hydraulic press must be controlled at 30-60 °C. If the oil temperature exceeds this range, it will have many adverse effects on the hydraulic system.
When the working pressure of the 4-column hydraulic press is greater than 25MPa, we can control the working pressure of the four-column hydraulic press through the electric contact pressure gauge on the hydraulic system or the system pressure regulating valve. The pressure overload of the four-column hydraulic press will cause the equipment pressure to rise rapidly, which will cause the hydraulic pump and motor to work overloaded and affect their service life. The corresponding hydraulic cylinder will also be overloaded, affecting the service life of the hydraulic cylinder. If the quality of the hydraulic pipeline is not good, it will also cause the oil pipe to burst and leak oil, causing some failures and damage to the equipment. The pressure overload of the four-column hydraulic press not only affects the performance of the equipment, but also causes certain accidents.
Many large manufacturers will consider the corresponding problems at the beginning of the design and install the corresponding unloading valve. When the pressure suddenly rises, the high pressure hydraulic oil returns to the oil tank through the unloading valve or the shutdown protection device.
Therefore, when purchasing a four-column hydraulic press, not only depends on the price of the equipment, but also on the technical strength of the manufacturer. Especially the four-column hydraulic press purchased by a small company cannot guarantee not only the quality, but also the hydraulic system, not to mention the influence of pressure overload.
(1) First of all, we must understand the principle and corresponding structural performance of the four-column hydraulic press machine, and carry out the pressure test according to the instructions for use.
(2) During the pressure test, the system valve should be adjusted to the selected pressure test value.
(3) After turning on the power, start the motor and observe whether the rotation direction is correct.
(4) During the debugging process, special attention should be paid to the temperature change of the hydraulic oil. The suitable temperature of general hydraulic system is 40-50℃. When working at this temperature, the efficiency of the hydraulic components is high, and the oxidation resistance of the oil is in a state. When the working temperature exceeds 80 °C, the oil will deteriorate early (for every 10 °C increase, the oil deterioration rate will increase by 2 times), and it will also cause the viscosity to decrease, the lubrication performance to deteriorate, the oil film to be easily broken, and the hydraulic parts to burn easily. Therefore, the working temperature of hydraulic oil should not exceed 70 ~ 80 ℃, when it exceeds this temperature, it should be stopped for cooling or forced cooling measures should be taken.