What Is The Reason For The Automatic Falling Of The Excavating Arm Of The Tunnel Mucking Machine Crawler Mucking Loader?

What Is The Reason For The Automatic Falling Of The Excavating Arm Of The Tunnel Mucking Machine Crawler Mucking Loader?

The boom of the tunnel mucking machine falls automatically, which is a disadvantage often encountered in the use of the tunnel mucking machine. Mining crawler mucking loaders often work under the condition that the boom automatically falls, which not only reduces the working power, the hydraulic oil temperature rises too high, and the service life is shortened, but also increases the engine oil consumption. So what is the cause?
Under normal circumstances, when the piston rod of the boom cylinder of the slag scraper extends to the limit position, the boom cylinder no longer moves, the hydraulic oil is compressed, and the pressure of the hydraulic system continues to rise. When the pressure of the hydraulic system reaches the pressure setting value of the working equipment of the mining crawler mucking loader(that is, the calibration value of the main safety valve), the main safety valve is opened, and the high-pressure oil output from the gear pump will be released from the main safety valve to the hydraulic oil tank. .
According to the above principles, the reasons for the automatic falling of the boom of the mini mucking loader are analyzed in the following four points:

A: Hydraulic hose leakage Assuming that the sealing ring of the hydraulic pipe joint is damaged, the crimping is not solid, or the pipe body itself is damaged, the hydraulic oil in the high-pressure chamber of the boom cylinder will spray hydraulic oil from the damage and gap, which will cause the mini mucking loader The boom falls automatically.

B: The shortcoming of boom reversing valve spool The boom of the slag machine falls automatically.

C: Main safety valve defect When the main pressure of the hydraulic system exceeds the set value, the hydraulic oil in the main oil supply pipeline of the hydraulic system will be released through the main safety valve. If the main safety valve is stuck or damaged, the hydraulic system of the mini mucking loader will be abnormally depressurized here, and then the boom will fall automatically.

D: The defect of leakage in the boom cylinder During the rapid movement of the boom cylinder piston rod, the air in the boom cylinder of the mining mucking rock loader will be suddenly compressed due to sudden high temperature and high pressure. If the generated high temperature and high pressure exceed the bearing limit of the seal ring of the boom cylinder, the seal ring will fail. After the piston seal of the boom cylinder of the tunnel mucking machine fails, the hydraulic oil in the rodless cavity will leak to the rod cavity, and then the boom will fall automatically.

These are some of the factors for the automatic falling of the excavating arm of the mucking rock loader. If no problems are found in these aspects, professional maintenance personnel are required to check.