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2024
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Have you mastered these 30 questions and answers on coal mining management?
1. What are the guidelines and principles for coal mine safety production?
Coal mine safety production management should implement the principle of "safety first, prevention foremost, and comprehensive management," and the principle of balancing "management, equipment, and training."
2. What are the "three major regulations" in coal mines?
"Coal Mine Safety Regulations," "Operating Regulations," "Working Regulations."
3. What route should be taken for evacuation in case of fire or explosion?
In case of fire or explosion, regardless of whether there is a backflow, the evacuation route must be against the airflow.
4. What is the principle of action for personnel on site during an accident?
The principle of action for personnel on site during an accident is to report promptly, rescue actively, evacuate safely, and avoid disasters properly.
5. What does "three violations" refer to?
Violating command, violating operating procedures, violating labor discipline.
6. What are the "three lifelines" underground in coal mines?
Communication lines, air supply pipes, dust control water pipes.
7. Is it allowed to use a coal mining machine to tow, push, or lift other equipment or objects?
It is strictly prohibited to use a coal mining machine to tow, push, or lift other equipment or objects.
8. What is the principle of "three no production"?
No production without safety, no production without eliminating hidden dangers, no production without implementing measures.
9. According to the number of casualties and the degree of damage, how are accidents classified?
Accidents are classified into: particularly major accidents, major accidents, relatively large accidents, and general accidents based on the casualties and damage caused.
10. What are the signs of water inrush in a mine?
Red flags, sweating walls, water sounds, air becoming cold, increased dripping from the roof, roof pressure, floor bulging, seepage from cracks, muddy water, foul smell, etc.
11. What are the requirements for liquid supply when checking the hydraulic system of supports, disassembling or replacing various valves and high-pressure hoses?
When checking the hydraulic system of supports, the liquid supply shut-off valve must be closed or the pump stopped before disassembling or replacing various valves and high-pressure hoses, and the system must be unloaded before proceeding with disassembly and replacement.
12. What equipment must be protected when blasting is required at the working face?
When blasting is required at the working face, supports, jacks, pipelines, communication facilities, etc., must be well covered to prevent damage.
13. What are the signs of spontaneous combustion of coal?
Signs of spontaneous combustion of coal that can be detected by human senses include: mist in the tunnel or sweating walls; abnormal odors in the airflow, such as kerosene, rosin, or foul smells; water and air flowing from natural coal locations being at higher than normal temperatures; discomfort in people when the concentration of toxic and harmful gases in the air increases, such as headaches, dizziness, and mental fatigue.
14. What are the dynamic standards for comprehensive mining working faces?
Dynamic standards for comprehensive mining working faces include: "three straight," "two flat," "one clean," and "two smooth." That is, "three straight" refers to straight coal walls, straight transport machines, and straight supports; "two flat" refers to flat roof and floor; "one clean" refers to clean floating coal; "two smooth" refers to smooth upper and lower exits.
15. What should be done in case of a fire?
In case of a fire, if the fire is not large, personnel nearby can be organized to extinguish the fire and report to the dispatch room.
16. Where are the locations prone to roof falls in the coal mining working face?
Locations prone to roof falls in the coal mining working face include: the machine lane of the coal mining working face, the roof support line of the coal mining working face, and the two safety exits of the coal mining work.
17. What are the requirements for safety exits in the coal mining working face?
The coal mining working face must maintain two unobstructed safety exits, one leading to the intake airway and one leading to the return airway.
18. What are the requirements for the two ends of the coal mining working face?
All safety exits of the coal mining working face must be reinforced within a 20-meter range where they connect to the tunnel, with the height of the tunnel in comprehensive mining not less than 1.8 meters, and in other mining faces not less than 1.6 meters.
19. What are the signs before a roof fall occurs in the coal mining working face?
Signs before a roof fall occurs in the coal mining working face include: roof pressure, falling debris, coal wall spalling, noticeable stress on supports, tilting, and drilling at the bottom.
20. How are the regulations for simultaneous operations of mining and tunneling personnel in each mining area defined?
In each mining area, the number of mining and tunneling personnel working simultaneously per shift: for coal mines with an annual approved production capacity of 30-90 million tons (including 90 million tons), it must not exceed 85 people. Among them, the number of personnel in the comprehensive mining working face per shift must not exceed 26; in the comprehensive tunneling working face, it must not exceed 16; in the blasting tunneling working face, it must not exceed 12.
21. What conditions must be met for a gas explosion?
A gas explosion must simultaneously meet three conditions: gas concentration of 5-16% can trigger an explosion; ignition source temperature of 650-750°C; oxygen concentration in the air greater than 12%.
22. How to correctly use comprehensive mining supports?
Supports must be intact, pressure must meet regulations, no liquid leakage, no unloading; supports must be vertical to the roof and floor, not tilted, not squeezing, not biting, and the center of the supports must comply with operational regulations and requirements, with deviations not exceeding ±100mm, and supports must not be used at excessive heights.
23. What are the requirements for supports during normal operation?
Supports must be tightly connected to the roof, initial support force not less than 24Mpa, and when the roof is broken, must be supported in advance; when passing through faults, old tunnels, or broken roofs, pressure relocation methods should also be used.
24. What should be noted when the coal machine is cutting coal?
When breaking coal, it is important to frequently pay attention to the top and bottom plates, coal seam, changes in coal quality, and the load conditions of the scraper conveyor. Adjust the traction speed and cutting height at any time, cut the coal wall in a straight line, and do not leave top or bottom coal arbitrarily.
25. What are the requirements for the pump station of the comprehensive mining face?
The equipment and pipeline system of the working face pump station must be intact, and the pump station pressure: comprehensive mining face ≥ 30Mpa.
26. What are the reasons for the slow running of the coal conveyor belt?
The reasons include excessive or insufficient oil filling, overload, frequent starts, and mechanical vibrations during operation.
27. What is the function of the tensioning device of the belt conveyor?
(1) Ensure that the belt has sufficient tension to generate the required friction between the drum and the belt. (2) Limit the sag of the belt between the supporting rollers to ensure the normal operation of the conveyor.
28. What are the requirements for the moving frame when the coal cutter is working?
When the coal cutter is working, the frame must be moved in a timely manner. If the distance between the support and the coal cutter's suspended top exceeds the specified limit, the coal cutter must stop.
29. What are the general inspection items for the comprehensive mining face?
Special work permits, safety exits, working face support, coal cutting operations, moving frames and pushing, one ventilation and three prevention measures, monitoring and control, support in the return airway, power supply, drainage, hoisting transportation, safety facilities, signal communication, communication lines, dust suppression water pipes, and compressed air pipeline technical management, etc.
30. What items should the coal cutter driver check before starting?
1. Cutting teeth 2. Internal and external spraying 3. Signal system 4. Isolation switch, operation buttons 5. Scraper conveyor 6. No one within a 5m radius near the drum.
Coal mine safety production,conveyor
Latest developments
2024-11-18
Coal mining machine maintenance technical requirements
The casing must be free of cracks or deformation. Welding repairs are permitted, but measures must be taken to prevent deformation and eliminate stress.
2024-11-18
The coal mining techniques that are commonly used underground in coal mines.
The blasting mining process uses blasting methods to extract coal mines. In practical applications, the selection of blast holes is crucial. If the design is improper, the blasting effect will be affected. In mild cases, there may be blasting deviations, impacting the extraction volume; in severe cases, it can cause losses to life and property. A large amount of dust is generated after blasting, and the mining area needs to be managed post-blasting.
2024-11-18
What are the components and characteristics of coal mining machines?
The coal mining machine mainly consists of an electric motor, hydraulic transmission part, traction transmission part, cutting part, bottom support frame, height adjustment oil cylinder, cable dragging device, and so on.
2024-11-18
Gansu Energy and Chemical: 8 pairs of coal production mines have an approved annual production capacity of 16.24 million tons.
Gansu Energy Chemical released the investor relations activity record on June 18, stating that on June 17, 2024, the company received research from 59 institutions, including QFII, insurance companies, others, fund companies, securities companies, and sunshine private equity institutions.
2024-11-18
Have you mastered these 30 questions and answers on coal mining management?
30 questions and answers on coal mining management.