For the dump trailer or truck, the importance of lifting mechanism is like the saddle in the sling transport, which can greatly improve the transport efficiency of the vehicle. Some people may wonder why a small hydraulic lifting mechanism can have such magic power. What's the secret? Today, we will take you to talk about the dump truck hydraulic lift.

Hydraulic cylinder installation

When installing, ensure that the direction of the top connecting head of the piston rod should be consistent with the direction of the cylinder head, earring, (or the middle hinge), and ensure the straightness of the whole piston rod in the process of advance and exit, to prevent the occurrence of rigid interference phenomenon, resulting in unnecessary damage.

After the installation of the hydraulic cylinder, grease should be added to the ring, middle hinge shaft and other striking parts before trial operation.

Hydraulic cylinder debugging

Hydraulic fluid requirements

1. Pay attention to the range of pressure and temperature.
2. Check whether the oil used by the system is consistent with the oil cylinder allowed to use.
3. Mineral oils in accordance with DIN51 524 are usually used.

Exhaust requirements for hydraulic cylinders

1. Under no-load pressure, let the cylinder work repeatedly for a period of time to drain the air in the cylinder and pipeline;
2. In the cylinder with exhaust screw plug, loosen the screw plug, detect the flow of oil no longer bubble, lock the screw plug.

Hydraulic cylinder holds pressure

First of all, we need to summarize the main reasons why the hydraulic cylinder can not hold pressure, and then we can take targeted measures. In fact, the main problem causing poor pressure retention is cylinder and control valve leakage. So, when solving this problem, the basic measures we can take is to reduce the occurrence of leakage as much as possible. However, in practice, leakage problems more or less exist, which will lead to the pressure slowly reduced.

Therefore, if the requirements are more strict, then we can take the method of filling oil to achieve the effect of maintaining pressure. For example, if it is the internal and external leakage of the hydraulic cylinder, then we should not only improve the sealing situation, but also improve the manufacturing accuracy and coordination accuracy of the components as much as possible, in order to weaken the degree of internal and external leakage.

If the leakage problem is caused by the control valve used, then we need to replace the more suitable control valve, and in the hydraulic cylinder system, should reduce the leakage point as much as possible. This requires in the design, should try to control the number of control valve and take over the number.

In view of the problem of leakage, if we want to ensure the ideal pressure holding effect, then we have to take oil filling measures. In other words, in hydraulic cylinder systems, we need to continuously replenish the pressure oil, generally, this method is suitable for a long time to hold pressure system.

The piston of a hydraulic cylinder

If the piston length is too short, it may affect the service life of the hydraulic cylinder. Normally, the length of the piston rod is 0. 7 ~ 1.0 times of the outer diameter of the piston. This can also increase the guiding effect of the piston rod and increase the supporting surface area. Because of this, the wear of hydraulic cylinder can be appropriately reduced and its service life can be improved.

The second problem that needs to be considered is that when designing the piston rod, it should achieve a certain accuracy of the shape and position tolerance. Hydraulic cylinder manufacturers explained that, you know, the quality of the hydraulic cylinder will be seriously affected by the piston rod. So in order to ensure its smooth operation, then we must ensure that when processing the piston rod, to achieve enough precision of the shape and position tolerance.

In order to meet this requirement, the roundness and cylindricity of the piston outer diameter, inner hole should be within half of the dimensional tolerance.