When it comes to mining single hydraulic prop, as the name implies, it is also a kind of equipment used in coal mines. Mining hydraulic acrow prop is a single hydraulic prop with constant resistance, which can cooperate with various roof beams or be used as main pillar. It can be used for supporting roof of blasting face and other temporary supports. Today, I want to tell you about the precautions for the suspension hydraulic prop maintenance of the mining single hydraulic prop. You must keep it in mind.
1. If the steel acrow props surface of the column, Jack and sealing ring has the following defects, it is allowed to use oilstone for finishing: the axial scratch depth is less than 0.2mm and the length is less than 50mm; the radial scratch depth is less than 0.3mm and the length is less than 1 / 3 of the circumference; the area of slight scratch is less than 50mm2; there are no more than two scratches on the same circumference and no more than two scratches;
2. The surface roughness Ra of piston rod is less than or equal to 0.8 μ m, and the surface roughness Ra of inner hole of cylinder block is less than or equal to 0.4 μ M.
3. The cylinder block shall be free of cracks, and the thread, ring groove or other connecting parts at the end of the cylinder block shall be complete. The pipe joint shall not be deformed.
4. The non matching surface of the cylinder block shall be free of burrs, the scratch depth shall not be greater than 1mm, and the area of wear and bruise shall not be greater than 2cm2.
5. After the steel acrow props piston rod and cylinder block are repaired, they shall meet the requirements of the above clauses of this specification, and the coating shall meet the technical requirements of the manufacturer. After the repair, there is no chemical reaction between the piston rod, cylinder block and the seal.
6. When repairing and inspecting the double expansion column in the bottom valve of the equipment used for mining hydraulic acrow prop, it is necessary to check whether the sealing of the bottom valve is normal, whether the filter screen needs to be replaced, whether the spring has problems, whether the valve core has friction, etc. after confirmation, the repair is carried out.
