Common causes of hydraulic tube burst
1.Use of inferior hydraulic pipes
After the original hydraulic pipe is damaged, many people choose a low-quality hydraulic pipe for the sake of cheapness. This kind of hydraulic pipe has far lower performance and reliability than the original one.
In addition, the metal joints at both ends of the hydraulic pipe are poor in the crimping process, and the tightness and reliability cannot be guaranteed. After a period of use, oil saving or even oil leakage will occur. Therefore, the replacement of the hydraulic pipe must choose a regular big brand product.
2.The pressure of the hydraulic system is too high
If the preset pressure of the hydraulic system is too high, it will increase the probability of tube burst. The method is to test the pressure value generated by the main pump in combination with various actions. If the pressure value is confirmed to be too large, the pressure of the multi-way valve can be appropriately lowered.
3.The temperature of the hydraulic oil is too high
If the temperature of your machine's hydraulic system is high, it will also affect the tightness of the hydraulic components and cause leaks. In addition, the high temperature will cause the hydraulic components to expand, causing the valve core and the valve body to become stuck, resulting in a local high temperature and causing a burst.
4. Mixing hydraulic oil of different labels
Excavators generally use 46 # hydraulic oil as the factory default. If 68 # hydraulic oil commonly used in parts shops is added during use, the hydraulic oil will be unstable and damage components. High-viscosity hydraulic oil has poor fluidity, which can cause high pressure locally in the hydraulic system, and easily cause pipeline leakage.
5, bad operating habits
If the operator performs rough operation during operation, the huge impact load will generate instantaneous impact pressure in the hydraulic system. The impact pressure will cause the premature failure of the high-pressure oil pipe joint and the hose to leak oil or burst the pipe, which will greatly shorten the hydraulic pressure. Tube life. In addition, rough operation will affect the durability of other components, causing frequent mechanical failures. Therefore, the operation of the excavator must be gentle, and high-intensity and high-risk operations are not required.
6, the hydraulic pipe is corroded
Although most of the current hydraulic pipes have a certain degree of corrosion resistance, after all, long-term exposure of rubber 名媛直播 to diesel oil will make the colloid fluffy and deteriorate. Have certain adverse effects, try not to let the hose contact the gasoline and diesel. Generally, rubber will swell and fluff in the long-term soaking of gasoline and diesel. Therefore, in normal use, it is necessary to avoid corrosive liquids such as diesel oil from contacting the hose, and the outer surface of the hydraulic pipe must be cleaned frequently.
7, abnormal vibration of the hydraulic pipe
I posted that the gear pump and the plunger pump have oil pulsations when they work. This pulsation will cause high frequency vibration of the hydraulic pipe. This high frequency vibration cannot be completely eliminated. Long-term abnormal vibration will cause fatigue and wear of the hydraulic pipe. Therefore, check the pipe clamps and protective sleeves of the hydraulic pipe frequently. Once the pipe clamp is loose, the hydraulic pipe will be worn or even worn.
How to remedy the hydraulic pipe burst?
When a hydraulic pipe burst occurs in the operation project, because the burst is a high pressure in the hydraulic pipe, in order to avoid excessive loss of hydraulic oil, the bucket should be dropped to the ground first, and then stopped and shut down to reduce the pressure in the hydraulic system. Slows oil loss.
If the conditions of the construction site are limited and the hydraulic pipes cannot be replaced immediately, certain repair measures can be taken. When the rubber hose of the hydraulic system with a pressure of 25-8.0MPa is broken, the sticking method can be adopted: the specific method is to wipe the area around the hose rupture clean; apply "anaerobic" glue, "epoxy resin" One of the "rubber", "801" or "502" glue is wrapped with adhesive tape or cloth strips 4-5 layers (each layer should be coated with glue) to play a temporary sealing role.
In some hydraulic systems of excavators and loaders, the rubber hoses of the same oil circuit have the same specifications but bear different oil pressures. Most of the ruptured hoses are hoses with high oil pressure. Simple sticking or bundling of broken hoses; interchange the large and small cavity oil tubes of the boom cylinder (that is, use unbroken tubing to withstand high pressure, and use damaged or simply glued or bundled tubing) Withstand low pressure).
The above method is only used as a temporary emergency remedial measure, and the performance of the hydraulic pipe will decrease to a certain extent. Therefore, once the hydraulic pipe bursts, the conditions should allow the new hydraulic pipe to be replaced and the hydraulic oil replenished as soon as possible.
