Preventive Measures Of Hydraulic System Leakage(2)

1. Reduce shock and vibration

The impact of the hydraulic system is mainly generated in the process of pressure change, speed change and reversing. At this time, the liquid flowing in the pipeline instantly forms a high pressure peak due to the rapid reversal and the sudden closing of the valve port, which makes the connecting parts , The joint and the flange are loose or the sealing ring is squeezed into the gap and damaged, etc., resulting in leakage. To reduce leakage due to shock and vibration, the following measures can be taken:

①Fix all the tubes with shock-absorbing brackets to absorb the energy of shock and vibration.

②Adopt reversing valve with damping, slow opening and closing valve, and set buffer device (such as one-way throttle valve) at the end of hydraulic cylinder.

③ Use a low shock valve or accumulator to reduce shock.

④ Properly arrange pressure sensor to protect all components of the system.

⑤ Minimize the number of pipe joints used, and the pipe joints should be connected by welding as much as possible.

⑥ Use threaded direct ends, tee joints and elbows instead of taper pipe threaded joints.

⑦ Try to use oil return block instead of each configuration.

⑧ For the maximum pressure used, specify the torque of bolts and plugs used during installation to prevent damage to the joint surface and seals.

2. Reduce the wear of dynamic seals

Most of the dynamic seals in the hydraulic system are precisely designed. If the dynamic seals are qualified, installed correctly, and used reasonably, they can ensure no leakage for a long time. From a design perspective, the following measures can be taken to extend the life of the dynamic seal:

①Remove radial load on piston rod and drive shaft seal.

②Protect the piston rod with a dust ring, a protective cover and a rubber sleeve to prevent dust and other impurities from entering.

③ Design and select appropriate filter device and oil tank that is easy to clean to prevent dust from accumulating in the oil.

④ Keep the speed of the piston rod and shaft as low as possible.

3. Reasonable design of the mounting plate

When the loader hydraulic valve group or base plate is fixed on the installation surface with bolts, in order to obtain a satisfactory initial seal and prevent the seal from being squeezed out of the groove and worn, the installation surface should be straight, the sealing surface requires finishing, and the surface The roughness should be less than Ra0.8μm, and the flatness error should be less than 0.01/100mm; the surface should not have radial scratches, and the pre-tightening force of the connecting screw should be large enough to prevent the surface from separating.