The reason for unstable pressure in vacuum hot press machine - Quanzhou three station automatic sliding table hot press machine

The use process of a vacuum hot press machine cannot be separated from pressure. Once the pressure drops, it will affect normal use. A single-layer hot press is an electrical and mechanical connection device that heats two pre coated parts with solder flux to a temperature sufficient to melt and flow the solder. After solidification, it forms an electrical and mechanical connection between the parts and the solder. Due to the special design of the welding head surface, the resistance of the welding surface of the hot press machine brand is very small, and the current will pass through the section with the lowest resistance. By constantly changing the voltage, adjusting the current level, and quickly heating it up through the welding head. The Qingdao hot press machine adopts advanced electronic new product control, which can automatically complete the processing steps of entering, lifting, heating, vacuum, film pressure, demolding, and lowering through adjustment. Mainly powered by oil pressure and compressed air, sufficient air pressure and volume are required. The frame is composed of steel plates processed as a whole, with a reasonable overall structure. The two workbenches can be recycled or used separately. So why does the hydraulic cylinder experience a severe decrease in pressure during the holding period--- Quanzhou Three Station Automatic Sliding Table Hot Press

1. In the control valves of hydraulic systems, directional valves account for a considerable proportion in terms of quantity. The basic working principle of a directional valve can be relatively simple. It is the enterprise that uses the change in the relatively important position between the valve core and valve body to complete the connection or disconnection of the oil circuit, so that we can perform the relevant components through startup. The primary problem and its impact on the direction development control information circuit are: insufficient analysis of electromagnetic attraction, which cannot fully promote the movement of the valve core. The DC electromagnet has high residual magnetism, which prevents the valve core from resetting. Tilt the axis of the center tension spring, causing the valve core to jam inside the valve. The valve core is roughened and stuck inside the valve body. The oil pollution environment is severe, blocking the sliding gap and causing the valve core to get stuck. Due to poor machining accuracy of the valve core and valve body, different radial clamping forces are generated, causing the valve core to jam.

2. The hydraulic cylinder of the vacuum hot press does not maintain pressure due to internal and external leakage. The internal leakage between the two chambers of the hydraulic cylinder depends on the reliability of the piston sealing device and the gap sealing. Improving the manufacturing and matching accuracy of cylinder bore, piston, and piston rod is beneficial for reducing the defects of poor pressure retention caused by internal and external leaks--- Quanzhou Three Station Automatic Sliding Table Hot Press

3. The leakage of each control valve, especially the leakage of the directional valve close to the hydraulic cylinder of the vacuum hot press, is an important factor in maintaining pressure. The leakage of hydraulic valves depends on the structure and manufacturing accuracy of the valve. Therefore, its pressure retention effect is significantly better than that of the valve core type with a positive cover. The machining and installation accuracy of other necessary progress valves, even the conical seal of the valve, should pay attention to the accuracy and reliability of the conical seal of its cylindrical part.

4. During the time required to maintain pressure, the pressure cannot be maintained and gradually decreases. The primary reason for not being able to maintain pressure is due to leaks in the hydraulic cylinder and control valve. The primary measure and method to solve the problem of not maintaining pressure is to minimize leakage as much as possible. Because leakage is more or less inevitable, the pressure will inevitably gradually decrease. When a long pressure holding time and stable pressure are required, the oil replenishment method should be chosen. The reasons and solutions for the failure of vacuum hot press to maintain pressure are as follows.

Methods such as using a small pump to replenish oil or using an accumulator to replenish oil. In addition, some management methods in the pump source circuit can also be used to maintain pressure. When fast forward, two pumps supply oil to the system together. When maintaining pressure, the large flow pump on the left side is unloaded by the internal control system of the electromagnetic relief valve, and only the small flow high-pressure pump on the right side is independently developed to provide learning pressure oil to compensate for system leakage and complete pressure maintenance. The high-pressure oil of the accumulator is connected to the hydraulic cylinder to compensate for leakage in the standard system. The function of the one-way throttle valve before the outlet of the accumulator is to effectively prevent the sudden pressure relief of the accumulator and the formation of an impact when the reversing threshold is switched. Choosing the method of continuously replenishing oil by enterprises and continuously filling the gaps in the economic system during the pressure maintaining process, although we may feel depressed, is an effective way to maintain pressure for a long time. This method ensures that the pressure of the hydraulic cylinder of the vacuum hot press machine remains stable and unchanged. When the psychological pressure generated by the vacuum hot press machine is becoming increasingly severe and the main problem is decreasing, it is necessary to take timely measures to stop research work and conduct problem analysis, investigation, and maintenance to find out the true cause of oneself, and then students can get the correct method to solve it--- Quanzhou Three Station Automatic Sliding Table Hot Press