Notice on Further Strengthening the Safety Management of Metallic Non-Metallic Underground Mines

Safety Supervision Department Guan Yi [2009] No. 11

Safety production supervision bureaus of provinces, autonomous regions, municipalities directly under the Central Government and Xinjiang Production and Construction Corps:

Recent past, metal and nonmetal underground mines have occurred due to system upgrade caused the accident, causing great loss of life and property. The main causes of accidents are: First, the upgrading of equipment and facilities does not meet the standard requirements, there are major safety hazards, such as the cage door can not be closed, some tank tops are not enough pressure; second, the protection device settings are not complete, if any The shaft lifting system does not have a roll protection device. Some single rope lifting cages used as lifting personnel do not have a fall arrester. Third, the operation management is not strict. If some people do not lock the cage door according to regulations. In order to deeply absorb the lessons of the accident and avoid the recurrence of similar accidents, the notice for further strengthening the safety management of the metal non-metallic underground mine lifting system is as follows:

First, carry out the investigation and treatment of special hidden dangers in the mine lifting system. All regions should urge underground mining enterprises to make efforts to formulate work plans, organize professionals, and concentrate on checking the basic situation of the unit to improve the system and investigate potential safety hazards. For the hidden dangers identified, it is necessary to clarify the responsibility and rectify in time. The lifting system must meet the design requirements, and must use equipment and facilities that meet the requirements of national standards and industry standards. Equipment and facilities that do not meet the standards must be rectified within a time limit. The over-roll protection device and the signal device must be installed in place; the single-rope lifting cage of the lifter must have a safe and reliable fall arrester; the inclined well of the upgraded mine should be equipped with a normally closed anti-sports device; the upper and middle yards of the inclined shaft are not If you want to stop the car or block the car, you should immediately stop production and rectify. The lower yard of the inclined shaft should be built to avoid the diverticulum and has obvious signs.

Second, effectively strengthen the system operation management. The promotion operation should be managed by a qualified person. It is strictly forbidden to lift people and materials at the same time in the same layer of cages; when lifting and blasting equipment , some people should be monitored with the tanks. It is necessary to strengthen the maintenance of the lifting system, establish a regular inspection and maintenance system, clarify responsibilities, and pay close attention to implementation. Every day, the full-time staff should check the lifting system once. Every month, the relevant personnel should be inspected by the enterprise, and the hidden dangers should be immediately stopped and rectified in time. The main lifting devices, lifting wire ropes and other equipment and facilities shall be inspected and inspected regularly by qualified testing and testing institutions in accordance with the relevant standards.

Third, further increase the safety supervision work. Safety supervision departments at all levels should intensify supervision and inspection of mining enterprises, supervise the improvement of system safety in a timely manner, and urge all mining enterprises to regard the improvement of system safety management as an important part of mine safety production work, and earnestly carry out safety. Production hazard investigation and management work to ensure safe and reliable operation of the upgrade system.

General Office of the State Administration of Work Safety.

Excavator Cylinder Piston Seals

Precautions for the installation of hydraulic cylinder piston seals in excavators
1. The sealing of the oil cylinder piston should use products of reliable quality to ensure good sealing performance.
2.Before installing the oil cylinder piston seal, the seal and sealing groove should be cleaned to ensure that the sealing surface is free of impurities.
3. When installing the seal, the correct installation sequence and direction should be carried out according to the drawing requirements to ensure the correct installation of the seal.
4.When installing the seal, special tools should be used to avoid using sharp tools and hard objects to damage the seal.
5. When installing the seal, attention should be paid to whether the seal groove is damaged or worn. If so, it should be replaced or repaired in a timely manner.
6. When installing the seal, an appropriate amount of lubricating oil should be applied to avoid friction damage to the seal during installation.
7.When installing the seal, it should be ensured that the compression of the sealing ring meets the requirements to avoid excessive or insufficient compression leading to seal failure.
8.After installing the seal, a sealing test should be conducted to ensure that the sealing performance meets the requirements.