Hydraulic universal testing machines typically seal joints using the side surface of the polyethylene blow-molded barrel. A water pump is used to fill the barrel with water at 20±2°C, helping to expel air. Once the desired pressure is reached, it's maintained for 30 minutes before inspection. However, during operation, you might encounter issues like constant vibration in the fuel tank. Why does this happen? The engineers at Shanghai Jianjian are here to explain.
1. One common cause is the installation of the hydraulic oil pump—such as gear pumps, plunger pumps, vane pumps, or internal and external gear pumps—on the fuel tank itself. In large hydraulic systems, it’s more effective to place the pump and motor unit on the outer base of the tank and connect it via hoses. Many designers prefer mounting the motor and pump on top of the tank, which works for small pump stations but can lead to vibration in larger setups, causing instability in the fuel tank.
2. Poor structural design of the hydraulic station can also be a culprit. If the steel plate thickness of the fuel tank is too thin, it may not withstand the pressure and vibrations from the system. To prevent this, the tank should be built with thicker steel plates, reinforced with ribs on the sides and bottom, and the return pipe's shape or position should be adjusted accordingly.
3. Another issue is the lack of vibration-damping measures. Adding shock-absorbing materials under the fuel tank and beneath the hydraulic pump (whether it's a gear, plunger, or vane pump) can significantly reduce vibration and improve stability.
To address these issues, consider increasing the diameter of the return pipe or replacing the overflow valve with a larger one to slow down the flow rate and minimize turbulence inside the tank. Adjusting the direction of the oil outlet on the return pipe can also help avoid direct impact on the tank walls, reducing vibration. While it's difficult to completely prevent oil flow from hitting the side walls, especially when the overflow valve is open, proper design can distribute the impact evenly. This helps absorb some of the kinetic energy from the oil flow, preventing excessive agitation and noise within the hydraulic universal testing machine.
China Xuchang Wig Co., Ltd , https://www.hairxuchang.com