(1) The ore body and surrounding rock are hard:
(2) The deposit conditions are unstable, and the thickness, inclination and shape of the ore body vary greatly, which requires multiple mining methods;
(3) There are often geological structures such as faults, folds, veins penetrating into ore bodies, fault fracture zones, etc., which bring great difficulties to mining and prospecting work [1] . These characteristics make the metal mine and coal mine strata control in comparison with its own laws. Mine pressure is often referred to as ground pressure in metal mines.
During the mining process of metal ore, the mine pressure activity is closely related to the mining method. When using the room-column mining method, it generally shows that the top column and the column collapse, which leads to the collapse of the upper plate rock, resulting in large-scale mining pressure activities; the caving mining method is mainly manifested in the mining level roadway (squatting road, near road) damage.
For SUMITOMO Cylinder Seal Kit
Maintenance of Sumitomo hydraulic cylinder seals
Daily maintenance and upkeep can effectively solve the sealing problem of hydraulic cylinders, extend the service life of hydraulic cylinders, and improve the work efficiency of construction machinery.
1. Regularly check the wear of the hydraulic cylinder seals, and if severe wear is found, it should be replaced in a timely manner.
2. Clean the hydraulic cylinder seals to prevent impurities such as dust and sand from entering the interior of the seals.
3. Use appropriate hydraulic oil and avoid using expired or non compliant hydraulic oil to avoid damage to the hydraulic cylinder seals.
4. Avoid using hydraulic cylinders under excessive pressure or load to avoid damage to the seals.
5. Regularly check the liquid level and pressure of the hydraulic cylinder to ensure its normal operation and avoid damage to the sealing components due to hydraulic cylinder failures.
6. When the hydraulic cylinder is stopped for a long time, regular maintenance should be carried out, such as applying anti rust oil, to prevent aging or deformation of the sealing components.
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