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what causes piston fractures?

what causes piston fractures?

2021-06-22

Friends who often use hydraulic breakers sometimes encounter piston fractures, but don’t know what causes piston fractures? quality? Fatigue blow? weather reason? Human operation? These points will affect the breakage of the piston, so to ensure the long-term service life of the hydraulic breaker, in addition to the maintenance methods mentioned, it is also necessary to remember the operating essentials. For example, it is best to use butter once within two hours. It is necessary to keep the chiseland piston hitting surface lubricated, and the piston is not easy to deform. If the piston deforms, the cylinder liner and oil seal will be worn. After the cylinder liner is worn, leakage will occur. The oil will also be weak, and the cylinder liner will be worn too much, which will directly cause the hydraulic breaker to be scrapped, the drill sleeve will also be worn, and the replacement cycle will be shortened.

The good piston should meet the following requirements:

1. The piston should be strong and powerful during work, and the impact can reach the design index of the hydraulic hammer. This requires the gap between the cylinder and the piston to be just right. If the gap is too large, high-pressure oil leakage will increase during work and the hydraulic hammer will be weak. , If the gap is too small, after the oil temperature rises during operation, it will cause jamming or strain the piston and cylinder. Depending on the material and the diameter of the piston, the size of the piston and the cylinder are also different, generally above 0.005mm.

2. The piston has a long service life during operation, which requires the piston to have sufficient strength and hardness. In the case of severe impact, the contact surface of the piston and the chiselshould not be deformed, cracked or broken, and the surface should have Very high abrasion resistance.

3. Selection of materials.

This is a key issue in piston design and determines the length of the piston's life. Regarding the choice of materials, foreign manufacturers of hydraulic hammers all claim to use high-quality high-grade alloy steel.

Pistons that are integrally quenched with high-carbon alloy tool steel are not deformed during work and the plane in contact with the chiselis not prone to cracks, while pistons that are carburized and quenched with low-carbon alloy steel are easy to produce on the plane that contacts the chiselduring operation Deformation (flat surface depression) and cracks. If the cracks expand, fractures will occur and the piston will be scrapped.

    note:

When working on the hitting surface, if the object cannot be broken within one minute, consider changing the angle to hit, not for a long time. It is best to hit for about 20 seconds and stop for a few seconds. Long time hitting is prone to high temperature, often high temperature oil seal It will accelerate the aging and cause oil leakage, and the repair time will be missed.

Ordinary hydraulic breakers cannot be operated underwater. Because there is no waterproof design, water and sand are particularly easy to penetrate into the cylinder liner and enter the hydraulic oil downstream, causing the oil to be contaminated, and the hydraulic oil becomes white, turbid and emulsified. Sand and mud entering the cylinder liner will easily cause the cylinder to pull and damage the hydraulic parts. Don't!

When you find that the sound of the hydraulic breaker is dull or different from usual, you can't force it to work! Generally, the piston fracture will produce a muffled sound. When pressing down, the chiselis heavier. It is because the piston has a crack and a sharp edge, which is forcibly rubbed against the oil seal, which makes it feel heavy. The cutting edge will be as sharp as a knife, which will wear out the cylinder liner.

When repairing, remove the shell, just unscrew the four splint screws on the top, disassemble the four long rod screw caps, the hydraulic breaker can be separated, the top one is the nitrogen chamber, and the hydraulic oil pushes the piston toward When it reaches a certain pressure in the nitrogen chamber, it pushes the piston to generate energy and hits the chiseldownwards, and it moves again and again. The port has a sealing ring, pay attention to check. Remember: When removing long bolts, the nitrogen must be released first to prevent injury.

Generally, the piston is taken out from the nitrogen chamber and can be taken out by tapping it with a hammer. After taking it out, apart from the piston fracture, it is found that the front end has high temperature marks, the front end is deformed and uneven, and it has been deformed. This is a symptom of high temperature caused by long-term hitting.


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