Find out a summary of the current safety issues with conveyors

After operating various types of conveyors for a long time, serious safety loopholes have been discovered. At present, the Energy Administration has issued a notice on the special rectification of the safety of belt conveyors in coal mines. The following is a summary of the safety issues.

I. Coal mine mechanical and electrical management institutions and managers have poor ability to perform their duties

Although some coal mines have established mechanical and electrical management departments according to regulations, formulate The corresponding management system has been established, but it is not strictly implemented. In addition, the quality of management personnel is poor and frequently replaced, and it is common that the performance of duties is not in place. Guidelines for safe operation when using conveyors

1. First, the management of mechanical and electrical equipment is confusing. Some have not established and improved the mechanical and electrical equipment ledger and the entry and exit registration ledger, the original data collection of the belt conveyor is incomplete, and the product qualification certificate, safety sign certificate, product testing report and product manual are lost.

2. Second, the frame of some coal mine belt conveyors does not match the belt, resulting in large horse-drawn trolleys and serious coal scattering.

3. Third, the conveyor belt lacks a third-party inspection report. Only the factory certificate of the conveyor belt manufacturer can be provided, and the relevant information that has been tested and inspected by a third party cannot be provided.

4. Fourth, the training of belt drivers goes through the motions. The belt driver does not have a clear understanding of the protective installation position and protective function of the belt conveyor.

5. Fifth, after the completion of the intelligent construction of the auxiliary system, the quality of the relevant management personnel cannot keep up. There is a poor level of ability, lack of management experience, inadequate use, maintenance and management of the transportation subsystem, and the belt of the transportation system cannot realize one-key remote centralized control.

Second, the conveyor transfer point overlap and the coal-spreading prevention device do not meet the requirements

1. First, when the coal mine installs the belt conveyor, The lap joint is not carried out in strict accordance with the specified length, resulting in a large amount of coal scattered at the lap joint, a large amount of coal accumulation, and the friction between the belt and the coal is likely to cause a fire hazard.

2. The second is to prevent the installation of the coal-spreading device from not meeting the requirements. For the convenience of maintenance in some coal mines, the coal-spreading device is removed at will, or the inspection location is not installed. Prevent coal spreader.

Third, insufficient roadway section and lack of safety facilities for installing belt conveyors

1. First, there are defects in the design of roadway cross-section , There is no necessary safety clearance, resulting in insufficient walking space and safety distance for personnel, and inconvenient inspection and maintenance.

2. Second, some coal mines do not have belt crossing bridges, and there are no protective devices where they pass under the belt.

3. Third, there are gas drainage pipelines and drilling sites installed on the side of the belt conveyor against the wall. When measuring gas drainage data, personnel can only Standing on the conveyor belt, it brings safety hazards.

Fourth, the belt loading conveyor is overloaded, the various protection devices are uneven and the maintenance is not timely

1. One is the power supply In terms of load calculation and use, the setting value of the feeder switch of the belt conveyor is inconsistent with the insurance actually used. Some coal mines arbitrarily increase the insurance value, which makes the belt conveyor overload.

2. Second, the inspection and maintenance of the protection device is not in place. There are no inspection and maintenance personnel for the belt protection device in the coal mine, and the belt conveyor protection device is insensitive and unreliable after installation.

3. Third, the installation standards are not clear, and the CO sensors, temperature sensors, smoke sensors, and coal pile protection sensors that must be installed are not in accordance with the 'Coal Mine Safety Regulations' 》 and AQ1029-2019 standard installation.

4. Fourth, the use of over-temperature automatic sprinkler is poor. The water supply pipeline is often in an anhydrous state, or the branch pipes and valves are not set every 50m, the automatic sprinkler device cannot be used normally, and the dust-proof spray is insensitive.

5. Fifth, the daily maintenance is not in place. The failure of the protection function of the belt conveyor, the damage to the main engine of the comprehensive protection device, the lack of head and tail lighting or the incomplete setting of the emergency stop cable, and the partial lack of safety protection facilities.

6. Sixth, the guards or fences installed on the belt-driven drum have insufficient strength and unreliable fixation. Due to the inconvenience of cleaning floating coal, most The coal mine does not install the tail roller protective cover provided by the manufacturer.

V. The management of double-layer belt conveyors used in the main transportation is not standardized

There are technical requirements for the equipment that cannot be understood, and the basic management work is chaotic .

Six. There is a gap in the daily inspection and inspection of belt conveyors

1. First, mine belt conveyors have been listed as large coal mines. However, the inspection agency only conducts comprehensive inspection on the main belt, and the conveyor belts in other main transportation Shimen, transportation uphill, transportation lanes, etc. are not inspected.

2. Second, the function of the belt conveyor protection device was not checked and tested every month as required.

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