The return spring of the reversing valve of the hydraulic press not only has insufficient elasticity, but also has a skew phenomenon, causing the spool of the reversing valve to fail to return to its original position after a power outage. Therefore, the opening of the slide valve is too small, which throttles the oil passing through the reversing valve. The initial movement of the hydraulic cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is relatively high and the mobility is poor, resulting in the slow movement of the hydraulic cylinder. If the outside temperature is really too low, you can use a heater or corresponding insulation measures to increase the oil temperature at startup. The contamination of the oil should be checked; check whether dirt or colloid deposits are blocking the valve core or valve hole, and check the wear of the valve body. The throttling resistance in the control pipeline may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is interfered with. The control pressure of the hydraulic system of the hydraulic press is too low. The piston rod of the hydraulic press is stuck with the cylinder or the hydraulic cylinder is blocked. The way to cover it is to promptly replace the hydraulic oil with better viscosity and temperature resistance. If the outside temperature

Hazards of excessive temperature of servo hydraulic press 1. The temperature of the servo hydraulic press itself is too high, which reduces the viscosity of the oil and the leakage increase, and the efficiency of the system and the capacity base of the pump will be reduced. The oil film of moving parts such as slide valves will become thinner and produces greater friction resistance, resulting in increased wear and affects the inability to operate the machine. 2. The temperature of the equipment is too high, causing it to deform itself. Different moving parts in the hydraulic components have different degrees of thermal expansion, which will cause jamming due to the small gap between them at the same time, thus reducing the working efficiency of the servo hydraulic press. 3. Excessive temperature causes the service life of hydraulic oil to be greatly reduced, blocking the gap between the small holes, causing the pressure valve to not work normally. 4. Excessive temperature rise causes the rubber seal to deform, accelerate the aging degree, and cause leakage. 5. The excessive temperature reduces the air separation pressure of the oil, resulting in a decrease in the working performance of the hydraulic system. Therefore, we must follow the different load requirements of the servo hydraulic press and enter it

When a failure of the hydraulic press cannot rise, it usually manifests as if the pressure-regulating handwheel is fully tight, the pressure can only rise to a certain value and cannot continue to rise, especially when the oil temperature is high, which is particularly obvious. So what are the reasons for the pressure not rise? 1. Check whether the cartridge valve and the reversing valve are stuck 2. Check the circuit failure, which may be the main reason for the inability to rise under normal circumstances. It is recommended to use a screwdriver to stab the small reversing valve to see if it is stuck, and then check whether the indicator light of the rising small valve is on. 3. The main relief valve in the four-column press system is worn seriously, causing overflow and debris, which is why it is stuck. 4. The flush valve on the upper part of the oil cylinder is not opened, so it cannot rise under normal circumstances. 5. Check whether the oil cylinder is broken. 6. Whether the four-column press system is adjusted and balanced and stuck the beam, of course, there are not many such problems. 7. Total pump flow

You can use the following methods to determine whether the oil filter of the oil press is blocked: 1. Observe the appearance of the oil filter: Check the oil filter housing. If there is obvious accumulation of sludge and dirt, or there is obvious oil stain attachment in the inlet and outlet pipelines of the oil filter, it may imply that the oil filter is blocked. In addition, some oil filters have clogged indicators that indicate that the oil filter is clogged when the indicator shows a red or a warning sign pops up. 2. Feel the oil temperature change: blockage of the oil filter will cause the oil to flow poorly, causing the system to heat up and the oil temperature to rise. Therefore, if it is found that the oil temperature rises faster than usual during normal operation of the oil press, or the oil temperature is significantly higher, consider whether the oil filter is blocked. However, the increase in oil temperature may also be caused by other reasons, such as cooling system failure, and comprehensive judgment is required. 3. Check system pressure: Blockage of the oil filter will increase oil flow resistance, resulting in system pressure drop or instability. If the hydraulic press is working

The low pressure of the hydraulic press system may be caused by a variety of reasons. The following are some common factors: The wear of the pump of a failed hydraulic pump: After the hydraulic pump is used for a long time, internal components such as plungers, cylinders, distribution plates, etc. will be worn, resulting in a decrease in the volume efficiency of the pump and a decrease in the output flow, which will make the system pressure unable to be raised. Pump drive problems: Failure of the drive motor of the hydraulic pump, slipping of the transmission belt or damage to the coupling will cause the pump to fail to operate normally or the speed is insufficient, which will affect the pump's output flow and pressure. The set pressure of the relief valve is too low: the set pressure of the relief valve determines the maximum working pressure of the system. If the set value is too low, the system pressure cannot be raised to the required value. The relief valve spool is stuck in the open position due to impurities, oil stains or other reasons, which will cause hydraulic oil to flow directly back to the oil tank through the relief valve, resulting in the system pressure not being established. Hydraulic oil problem insufficient oil: hydraulic pressure in the oil tank

The damage to the hydraulic valve parts during daily production and use of hydraulic presses is usually caused by the following reasons: 1. Deformation of physical structures due to long-term fatigue and overload. When the stress during work and external load stress during use exceed the yield strength of the part material, physical deformation of the external structure occurs, especially the bending deformation of the valve core of the overflow valve and the spring deformation, the reciprocating operation is inflexible, resulting in unstable system pressure or slow state transition process. 2. The valve core and valve body are seriously worn, and the gap is too large. The valve core and valve body (shelves), etc. are constantly friction during movement and use, causing changes in the size, shape and surface quality of the parts to change, and the quality is reduced and the effect is ineffective. The solenoid reversing valve core is worn and deformed, causing the valve to leak internally, resulting in reduced efficiency or unstable pressure, causing the system to not work normally. 3. The oil is not clean and causes the hairpin to wear, which will cause the hydraulic valve parts to not work normally, and may even cause hydraulic pressure.