Why does the air pressure in the fuel tank of an electric forklift rise sharply?

by:Jxforklift     2021-12-25
The composition of Jiangsu electric forklifts is quite large. If a certain part has a problem, it may not be able to operate normally. Our electric forklift hydraulic oil tank is a common open structure in the industry, and the gas in the oil tank is communicated with the atmosphere through a respirator. When the oil return pipe returns oil, the excess air in the oil tank is discharged through the respirator. Preliminary analysis is that the cause of fuel injection is insufficient ventilation of the respirator, but the problem still exists after removing the respirator and working for a period of time. Take off the fuel filler cap and test it. After working for a period of time, the hydraulic oil will be sprayed directly from the fuel filler cap. The brake pump, steering gear, multi-way valve and mast cylinder return pipe ports are all arranged above the hydraulic oil level, and the pipe ports are facing the steel suction pipe. On-site observations revealed that when the working device drops under load, a large amount of oil is quickly returned to the oil, and after passing through the oil return pipe, it is sprayed to the oil suction pipe at high speed, forming a violent splash. After the hydraulic oil temperature rises, a large number of oil droplets and oil mist will be generated in the oil tank, which will cause the air pressure in the oil tank to rise sharply. These oils, oil droplets and oil mist are quickly discharged through the respirator. Due to the blocking effect of the filter screen, oil droplets and oil mist accumulate on the filter screen when passing through the respirator. Under the action of the pressure difference between the inside and outside of the fuel tank, the hydraulic oil is ejected from the respirator at high speed. Due to the above problems in the hydraulic oil tank, after research, the position of the oil return pipe on the hydraulic oil tank was re-arranged. The specific method is as follows: Arrange the oil return pipe of the brake pump, the return pipe of the steering gear and the return pipe of the multi-way valve with frequent oil return below the hydraulic oil level. Increase the distance between these oil return ports and the respirator. After re-arranging the above-mentioned oil return pipes of this type of forklift, the three oil return ports with frequent oil return are below the liquid level, avoiding the occurrence of oil droplets or oil mist caused by high-speed oil return hitting the oil suction pipe, and the oil injection phenomenon of the fuel tank respirator disappears. In addition, this improvement has a certain protective effect on hydraulic components and can also extend the service life of hydraulic oil. Seasonal maintenance of electric forklifts is also required, especially in autumn and winter. The appearance of forklifts is often very wet. If the car body has significant scratches, it should be painted in time to avoid moisture and rust on the scratched parts. Due to the corrosion of acid rain and summer rain, the paint surface of the car body will inevitably be oxidized under direct sunlight in summer. In the cold season, it is quite good to clean, maintain and repair the exterior of the forklift.
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