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.

After a certain period of use of the hydraulic pump of the hydraulic press, the parts of the hydraulic pump will wear and damage, resulting in a decrease in the movement accuracy and working performance of the pump, and various abnormal phenomena such as the inability to push up the oil pressure, the oil supply decreases, the intensification of noise, and the increase in vibration. These imaginations are often a symptom of wear or damage to hydraulic pump parts. Once the parts of the hydraulic pump wear out and exceed the allowable deviation, they must be repaired and restored in time to make the hydraulic pump regain the accuracy and working performance. In some cases, skilled operators can easily improve the working performance of hydraulic pumps through excellent repair and assembly. Causes of hydraulic pump damage There are various reasons for the damage to hydraulic pump, but in its essence, there are mainly two types 1. The wear of wear hydraulic pump parts is the same as that of any equipment, and is the inevitable result of mechanical operation. Under normal use conditions, due to friction and chemical reaction

Active maintenance emphasizes the root causes of routine inspection and correction that would otherwise cause equipment failure. In the case of hydraulic systems, there are three easily detected symptoms that are conditioned to give the hydraulic press manufacturer staff the root cause of early warning. These symptoms are abnormal noise, high fluid temperatures and slow operation. Abnormal noise Anomaly noise in hydraulic systems is often caused by inflation or cavitation. During aeration, the air pollutes the hydraulic oil. Air compresses and decompresses when hydraulic fluid makes a stunning knock or impact sound as it passes through the circulation system. Other symptoms include foamy fluid and unstable actuator movement. Aeration accelerates degradation of fluids and causes damage to the system components through lost lubrication, overheating and combustion of seals. Enter the hydraulic system through the inlet of the pump. For this reason, it is important to ensure that the pump's intake line is in good condition and all clamps and accessories are tight. Flexible air intake tube

Performance characteristics★Computer-optimized structural design, the four-column structure is simple, economical and practical; the frame structure is good rigidity, high accuracy and strong resistance to bias loading. ★The hydraulic control adopts a plug-in basic system, which has reliable operation, long service life, small hydraulic impact, and reduces continuous pipelines and leakage points. ★The electrical system controlled by imported PLc is compact in structure, sensitive, reliable and flexible; the relay control system is reliable in operation, intuitive in action, and convenient in maintenance. ★By selecting the operation panel, not only can the two formal processes be realized in fixed-range and fixed-pressure, but also can realize three process working cycles: padded, padless and ejection. Applicable fields are suitable for various stamping processes such as stretching, bending, forming, punching and blanking, and flanging. They are especially suitable for the following fields: ★Auto parts: body covering parts, brake pads, fuel tanks, chassis, axle shells, bumpers; ★Home use

For four-column hydraulic presses, the viscosity of hydraulic oil has many great impacts on the working state of a machine. So, what impact does the viscosity of hydraulic oil have on the work of the hydraulic system? Viscosity is one of the most important performance indicators of hydraulic oil. Whether it is reasonable or not has a significant impact on the movement stability, working reliability and sensitivity of the hydraulic machine factory system, system efficiency, power consumption, cavitation phenomenon, temperature rise and wear. For example, when the viscosity of hydraulic oil is high, the flow resistance of the hydraulic oil will increase and the flow rate will slow down; and due to friction loss, the consumption of r power will increase; the pressure drop will be added to the valves and pipelines, thereby reducing the efficiency of the system, and the intensification of friction will increase the oil temperature and cause leakage. If the hydraulic viscosity is low, leakage loss will inevitably aggravate, and the oil film between the moving parts will rupture, and the wear of the guide parts will be accelerated. Four-column hydraulic press is in use

1. Mix moisture into the oil 1. The way for water in oil to enter (1) The oil tank cap condenses into water droplets and falls into oil due to the alternation of cold and heat. (2) The seal of the cooler or heat exchanger is damaged or the cooling pipe is broken, causing the water to leak into the oil. (3) The humid air entering the system through the unsealed sealing part of the hydraulic cylinder piston rod condenses into water droplets. (4) Water that is brought by people when using oil and water absorbed by oil exposure to a humid environment. 2. Hazards of mixing moisture into the oil (1) After mixing a certain amount of water into the oil, the hydraulic oil will emulsify and become a white turbid state. If the hydraulic oil itself has poor anti-emulsification ability, after being stationary for a period of time, the moisture cannot be separated from the oil, making the oil always in a white and turbid state. This white emulsified oil enters the hydraulic system, which not only causes rust inside the hydraulic components, but also reduces its lubricating performance.