Nowadays, in our daily production and life, we often use some hydraulic equipment, such as hydraulic lifting platforms commonly used in high-altitude operations. Sometimes, when using it, we will find that the hydraulic cylinder makes a creaking sound. What is going on? Many users are confused. In fact, this is the air entering the cylinder, so do you know how the air enters the cylinder?
1. The oil level in the oil tank is too low or the oil suction pipe is not buried in the oil, so that the oil suction does not often enter the air;
2. The oil filter at the oil suction pipe of the pump is blocked by dirt, or the capacity of the oil filter is not enough, the mesh is too dense, and the oil absorption is not smooth, forming a partial vacuum and sucking in air;
3. The oil suction pipe in the oil tank is too close to the oil return pipe, and the oil splashing and stirring the oil produces air bubbles, and the air bubbles are sucked into the pump before they can be defoamed;
4. The oil return pipe is above the oil level. When the machine stops, the air flows back from the oil return pipe (when there is negative pressure in the cylinder);
5. The oil pipe joints of the system, the connection between the valve and the valve mounting plate are not tightly sealed, or due to vibration loosening and other reasons, air enters through the gap;
Due to seal damage, aging and deterioration, or poor seal quality, non-concentric sealing groove processing, etc., in the position with negative pressure (such as the piston rod at both ends of the cylinder, the pump shaft oil seal, the valve adjustment handle and the valve process plug, etc.) , due to the failure of the seal, the air will enter the gap.
