Coal mine safety power supply knowledge question and answer

1, "Coal Mine Safety Regulations" specify who may have to go down portable portable methane detection alarm or portable optical methane detector?

A: The mine chief, the mine technician, the blaster, the captain of the mining area, the captain of the ventilation zone, the engineering and technical personnel, the squad leader, and the mobile electric fitter must carry the portable methane detector. Gas inspectors must carry a portable optical methane detector. The safety monitor must carry a portable methane detection alarm or a portable optical methane detector.

2. What is coal (rock) and gas outburst?

Answer: Coal (rock) and gas outburst: Under the joint action of ground stress and gas, the broken coal, rock and gas are suddenly thrown out of the mining space by the abnormal dynamic phenomenon of the coal body.

3. What do the entry personnel do?

A: Personnel entering the well must wear a safety helmet, carry a self-rescuer and a miner's lamp with you. It is strictly forbidden to carry tobacco and ignition items. It is strictly forbidden to wear chemical fiber clothes. Drinking alcohol is strictly forbidden before entering the well.

4. What are the three major powers of the employee during the operation?

A: Employees have the right to stop illegal operations and refuse to violate the rules; when the workplace is in danger, they have the right to immediately stop their operations and withdraw to a safe place; when the danger is not handled, they cannot refuse to do so.

5. What kind of “four will not let go” to the accident handling?

A: The cause of the accident is not checked and not let go. The person responsible for the accident will not be dealt with, the corrective measures will not be implemented, and the lessons will not be absorbed.

6. What is local gas accumulation? Which locations are prone to gas accumulation in coal mining face?

A: In the top space of the roadway, the blind alley, the single-head roadway and other places where the wind flow cannot reach, there is a phenomenon that the gas concentration is above 2% and the volume is above 0.5M3. There are working angles on the working face, near the goaf, in the caving of the roof and near the shearer.

7. What are the main comprehensive dust prevention measures adopted by the mine?

Answer: (1) Establish a perfect dust-proof watering pipeline system; (2) carry out coal seam water injection; (3) spray watering (4) airflow purification; (5) release gun water; (6) flush lanes; (7) ) wet type eye; (8) gob area irrigation; (9) explosion-proof water shed; (10) brush white roadway; (11) personal protection.

8. What are the rights of coal mine safety inspectors and what obligations should they be fulfilled?

A: Power: 1) Right to field inspection. 2) The right to ask. 3) Access to data rights. 4) Disposal rights. 5) The right to sue.

Obligations: 1) Present a certificate when conducting a security inspection activity and confirm your identity to the person being inspected.

2) Comply with the relevant laws and regulations, enforce the law impartially, and do not follow the private situation.

3) Do not disclose the case and confidential information about the company to others.

4) Keep confidential for reporting and reporting personnel. The secrets should be strictly observed for the reports, the reporters, and the names of the respondents who reflect the unsuitable disclosure.

5) Do not use your powers for personal gain, be fair and honest, and have been public.

9. Under what circumstances is the blaster not allowed to take medicine or shoot?

Answer: (1) The empty top distance of the driving face is not in accordance with the work stacking regulations. There is no front probe bracket and empty top work.

(2) In the roadway within 10m from the working face, there is a collapsed or collapsed bracket that has not been repaired and is not reinforced.

(3) Before the charge and before the shot, the gas is not checked, and the gas concentration in the airflow within 10m near the shooting position reaches 1%.

(4) Within 20m of the location of the shooting, if there are mine cars, uncleared coal, sputum or other objects blocking the section of the roadway for more than 1/3.

(5) When abnormalities are found in the blasthole, the temperature is suddenly low, the blasthole water is discharged, there is significant gas escaping, and the coal rock is loose.

(6) When the depth of the blasthole and the minimum resistance line do not meet the requirements.

(7) If the linker does not return to a safe place, the guardian is not set up, and the length of the gunbar is not enough.

(8) When there is no safety measure through the old air, over the top of the fault, and through the tunneling.

10. What is the “three-person chain system”?

A: Before the shooting of the three-person chain, the gunman will hand the warning card to the team leader, the team leader will send a warning, and check the roof and bracket conditions, and hand the gun command card that he carries to the gas inspector, gas inspection. After checking the gas and coal dust, the guns were handed over to the gunners; the gunners fired the guns and then fired them. After the shooting, the three cards returned to the original owner.

11. What is the gas concentration of the coal mine safety regulations for the return flow of the excavation face?

Answer: When the gas concentration in the return airway of the mining area and the airflow in the return airway of the mining face exceeds 1.0% or the carbon dioxide concentration exceeds 1.5%, the work must be stopped, the personnel should be withdrawn, and measures should be taken for treatment.

12. What are the requirements for local ventilators in coal mines?

Answer: The "Safety Regulations for Coal Mines" stipulates that the roadway for excavation should be ventilated by full-pressure ventilation of the mine or local ventilator, and diffusion ventilation should not be used. The local ventilator and the electrical equipment for the heading face must have a wind power locking device. When the local fan stops running, immediately cut off all power in the local ventilation air supply duct. The local ventilator of the low gas mine heading face may be powered by a power supply line equipped with a selective leakage protection device or separately from the coal mining face.

13. What are the three elements of a gas explosion?

Answer: (1) The gas concentration is 5%~16%; (2) The ignition temperature is 650~750°C; (3) There is enough oxygen, and the oxygen content in the air is above 12%.

14, the underground power supply should be done three no, four, two, three, three insisted on what is the content?

A: Three no: no chicken paws, no sheep tail, no joints;

Four: There are overcurrent and leakage protection devices, screws and spring pads, seals and baffles, and grounding devices;

Both sides: the cable is hung neatly, and the equipment room is clean and tidy;

Sanquan: full protective equipment, all insulated appliances, all drawings and materials;

Three insistence: adhere to the use of leak detection relays, adhere to the use of coal drill, lighting and signal protection, adhere to the use of wind power and gas lock.

15. What is the electrical equipment explosion-proof? What is the electrical equipment explosion?

Answer: Explosion-proof: When the electric spark generated by the conductive parts in the outer casing of the electrical equipment causes the flammable gas in the outer casing to explode, it must not cause the explosion and combustion of the flammable gas mixture around the outer casing of the equipment. This property is called explosion-proof.

Explosion: Explosion-proof electrical equipment casing loses flameproofness and explosion resistance.

16. What is the “three specializations and two locks”?

Answer: Three specialties: special transformer, special line, special switch.

Two locks: wind power lock, gas lock.

17. Three items that must be worn by the general entry personnel? Three people are strictly prohibited in the well?

A: Personnel entering the well must wear a safety helmet, carry a self-rescuer and a miner's lamp with you. It is strictly forbidden to carry tobacco and ignition items. It is strictly forbidden to wear chemical fiber clothes. Drinking alcohol is strictly forbidden before entering the well.

18. What is the special return wind lane?

Answer: In the roadway of mining area, it is specially used for return air, and should not be used for roadway for transporting and installing electrical equipment. In the coal (rock) and gas (carbon dioxide) protruding areas, there is no pedestrian in the special return air lane.

19. What is series ventilation?

A: The return air from the downwind location will again enter the ventilation mode of other wind locations.

20. What is gas emission?

Answer: Gas spurt refers to the phenomenon that the coal seams and rock layers affected by mining are released, and the coal and vermiculite from the mining are evenly discharged into the underground space.

21. What is the “four in one” anti-burst measures?

Answer: When extracting outburst coal seams, it is necessary to take prominent measures for comprehensive prevention and control such as outburst prediction, prevention and control measures, effect inspection of outstanding prevention measures, and safety protection measures.

22. What are the dust prevention measures for the blasting work surface?

Answer: The working face of the blasting should be wet-type, using water cannon mud; the coal wall should be washed before and after blasting, spray dust should be sprayed when blasting, and water should be sprinkled when coal is discharged.

23. What is the “12-character” policy that gas control should adhere to?

A: First pumping and mining; monitoring and monitoring;

24. What are the regulations for the commissioning and correction of safety monitoring equipment in the “Safety Regulations for Coal Mines”?

A: Safety monitoring equipment must be commissioned and calibrated regularly, at least once a month. Methane detection equipment using a carrier catalytic element such as a methane sensor or a portable methane detection alarm device must be calibrated once every 7 days using a calibration gas sample and an air sample. The methane overrun function must be tested every 7 days.

25. What are the regulations for the inspection of safety monitoring equipment in the “Safety Regulations for Coal Mines”?

A: It is necessary to check whether the safety monitoring equipment and cables are normal every day. Use a portable methane detection alarm or portable optical methane detector to compare with the methane sensor, and report the results of the inspection and inspection to the monitoring attendant; when the reading error of the two is greater than the allowable error When using the larger readings as the basis, take safety measures and must adjust the two types of equipment within 8 hours.

26. Briefly describe the contents of the “one shot and three inspections” and the three people in the “three-person interlock”.

A: "One shot, three inspections" is the gas inspection before the pre-charge, before the shot and after the shot; the three people in the "three-person interlock" shot are the gunners, the team leader, and the gas inspector.

27. What are the comprehensive dust prevention measures for mines?

A: Regular roadway sprinkling, arranging explosion-proof water tanks, water drilling, coal body water injection, water cannon mud, watering before and after shooting, watering before and after armoring, wet spray and personal protection.

28. What are the signs before the top plate occurs?

A: The top plate is strong, the sand is lost, the easy piece is helped, the pillar is stressed, and the phenomenon of skewing and drilling is observed.

29. What is the content of the “Three No Injury” campaign?

A: "Three no harm" is: no harm to yourself, no harm to others, no harm to others.

30. What are the basic principles of underground disaster avoidance?

A: (1) Active rescue. Strive to eliminate accidents at an early stage or to control them to a minimum to minimize losses;

(2) Safe evacuation. When an accident cannot be avoided, the underground miner should evacuate safely at high tide;

(3) Take proper refuge. When it is impossible to evacuate, the person in distress should work hard to improve living conditions in the disaster area and wait for rescue.

31. What are the requirements for two safety exits for coal mining face?

Answer: In the range of 20 meters ahead of the two exits, it is necessary to strengthen the support. The fully mechanized mining (discharge) working surface, the height of the roadway shall not be less than 1.8m, and the other working faces shall not be less than 1.6m.

32. Why do you have to implement “one shot three inspection system” on the spot?

A: "One shot, three inspections" means that before the pre-charge of the mining face, before and after the shot, the blaster, the team leader, and the gas inspector must be on site, and the gas inspectors check the gas. When the gas concentration in the wind flow within 20M near the shooting site reaches 1%, the charging and blasting are not allowed. When the gas concentration reaches 1% after the shooting, it must be dealt with immediately. Otherwise, it is not allowed to continue the blasting or electric drilling. This system is just like the three "offices" on the scene, familiar with and master the situation on the ground, mutual restraint, and work together to achieve safe blasting. "One shot, three inspections" is the main measure to prevent gas leak detection before shooting, and to avoid shooting under the condition of gas overrun.

33. What are the regulations for operating downhole electrical equipment?

Answer: (1) Non-professionals or non-on-duty personnel are not allowed to operate electrical equipment without authorization;

(2) When operating the main circuit of high-voltage electrical equipment, the operator must wear insulated gloves and wear electrical insulation boots or stand on the insulation platform;

(3) The operating handle of the hand-held electrical equipment must be well insulated from the parts that must be in contact during operation.

34. What is the “ten inaccurate” content that must be done in underground power supply?

Answer: (1) No electrical maintenance, relocation of electrical equipment, cables and wires; (2) No pressure release and overcurrent protection device are allowed; (3) No leakage, relay, or coal drill integrated protection and local fan wind power, gas power locking device; (4) Not to operate fire, fire RBI, fire shooting; (5) allowed to use copper, aluminum, iron and the like in place of the fuse wire; (6) stop the wind, power outages The mining work surface is not allowed to be powered without gas inspection; (7) The faulty power supply line is not allowed to be forced to transmit electricity; (8) After the protection device of the electrical equipment fails, no power is allowed to be transmitted; (9) Explosive equipment, explosion-proof electrical appliances, not allowed to use; (10) is not allowed to dismantle the miner's lamp in the underground.

35. What regulations should be followed by pedestrians in the underground lane?

Answer: (1) Follow the instructions of the driver and crew, and must close the door or hang the protective chain before driving; (2) The human body and the tools and parts carried by it are strictly prohibited from being exposed outside the vehicle; (3) The train is running and has not stopped yet. When it is time to get on and off and stand in the car; (4) It is strictly forbidden to board on the locomotive or between any two cars; (5) It is strictly forbidden to ride; (6) When the vehicle is down, it must immediately send a parking signal to the driver. It is strictly forbidden to brake, jump and take a car.

36. What are the four major hazards of gas?

Answer: Gas is a colorless, odorless and odorless gas released during the mining process. It has four major hazards: one can burn and cause mine fire; the other is to explode, causing mine damage; the third is concentration High time will lead to lack of oxygen and suffocation, and even death; fourth, coal (rock) and gas outburst will occur, destroying and blocking the roadway, and even causing people to suffocate and die, gas explosion.

37. What are the signs of coal and gas outburst?

A: Coal and gas outbursts may occur when one or more of the following symptoms occur, so stop the operation immediately, evacuate from the job site, and report to the department when the following signs are observed.

(1) Silent signs: the pressure on the roof of the working face is increased, the coal wall is extruded, the slag is removed, the roof is sunk or the floor is bulged, the coal seam is disordered, the coal is dull and dull, and the gas in the working surface is suddenly ignored. Small, there are top drills, drills, etc. when drilling.

(2) There are signs of sound: the coal seam emits cracking sound, squeaking thunder, machine gun sound, sound from far to near, from small to large, there are short, continuous intervals of different lengths, vibration or impact on the coal wall, roof Pressing and the bracket will make a crack.

38. How to carry out effective disaster avoidance when a mine encounters a disaster?

Answer: (1) When encountering gas or coal seam explosion accidents, quickly turn back to the direction of air vibration, face down, and cover your mouth and nose with a wet towel to prevent inhalation of a large amount of toxic gases; Good self-rescuer, choose the top plate is strong, there is water or close to the water to avoid.

(2) When encountering a fire accident, first determine the disaster situation and your actual situation. If it is extinguished (fire), it will be destroyed. If it cannot be extinguished (fire), it will be quickly evacuated or evaded, self-rescue or waiting for rescue.

(3) When encountering a flood accident, try to avoid the water inrush head. When it is difficult to avoid it, it is necessary to grasp the solid objects around you and take a deep breath, and then carry out self-help or mutual rescue after the water head passes.

(4) When encountering coal and gas outburst accidents, it is necessary to quickly wear the isolated self-rescuer or enter the pressure self-rescue device or enter the refuge chamber.

39. How is the training and training for all employees required in the "50 Coal Mine Gas Control Experiences"?

A: All staff training and education implements “five ones” (one day, one topic, one week, one month, one month, one month, one month, one reward) and “three simultaneous” (worker cadres participate in training at the same time, At the same time, the examination, at the same time accept the rewards and punishments, to achieve full training before the class training, night school training key learning, off-the-job training systematics.

40. What is the basic idea of ​​gas comprehensive management?

A: The basic idea of ​​gas comprehensive management is to implement the working principle of “gas extraction and control, monitoring and monitoring, and wind production”, and establish the awareness that “gas accident can be prevented and avoided” and implement “can be saved”. The comprehensive gas management strategy of “guarantee, should be exhausted”, adhere to “high investment, high quality, strict management, strong technology, heavy responsibility”, change “extraction” to “extraction”, and improve the ventilation system as the premise Gas extraction and prevention are the key points, with monitoring and monitoring as the guarantee, regional governance and local governance are equally important, in order to set production, wind production, geological security, excavation first, technological breakthrough, equipment upgrade, management innovation, implementation of responsibility, Realize the sharing of media and gas, and build a safe, efficient and environmentally friendly mining area.

41. What is the “one pass and three defenses” of coal mines?

Answer: One refers to mine ventilation; three prevention refers to gas prevention, mine dust prevention and mine fire prevention.

42. What are the regulations for operating downhole electrical equipment?

Answer: (1) Non-professional or non-duty electrical personnel are not allowed to operate electrical equipment without authorization.

(2) When operating the main circuit of high-voltage electrical equipment, the operator must wear insulated gloves and wear electrical insulation boots or stand on the insulation platform.

(3) The operating handle of the hand-held electrical equipment must be well insulated from the parts that must be in contact during operation.

43. How is the distribution voltage of all levels of underground power and the rated voltage level of various electrical equipment specified?

Answer: The distribution voltage of all levels and the rated voltage level of various electrical equipment should meet the following requirements:

(1) High voltage, no more than 10,000V.

(2) Low voltage, no more than 1140V.

(3) The rated voltage of the power supply for lighting, signal, telephone and portable electrical equipment shall not exceed 127V.

(4) The rated voltage of the remote control line does not exceed 36V.

When using 3300V electrical equipment in the mining area, special safety measures must be established.

44. How is the number of gas concentration checks on the mining face specified?

Answer: (1) At least 2 times per shift in low gas mines;

(2) At least 3 times per shift in a high gas mine;

(3) The mining face with the danger of coal (rock) and gas outburst, the mining face with gas explosion hazard and the mining face with large gas and abnormal changes, must be checked by special personnel and methane is installed. Power failure meter.

45. What is the “three-fold” principle of safe production?

A: Management, equipment and training are equally important.

46. ​​What are the workers' safety responsibilities and safety production guarantees?

Answer: (1) Seriously study and strictly abide by various rules and regulations, labor discipline, do not violate the rules, and discourage the suppression of other people's illegal operations; (2) meticulous operation, do all kinds of records, hand over to create a safe production for succession Conditions; (3) Correctly analyze, judge and deal with various accidents, and eliminate the accident in the bud. In the event of an accident, it is necessary to deal with it correctly, report it to the superior in a timely and truthful manner, strictly protect the site, and make detailed records; (4) Do a good job in safety inspection before the operation, find abnormal conditions, timely handle and report; (5) Strengthen equipment Protection, keep the job site clean and tidy, and do a good job in civilized production; (6) must be dressed according to regulations; properly keep and properly use all kinds of protective equipment and fire-fighting equipment; (7) actively participate in various safety activities; (8) have the right to refuse Violation of work instructions.

47. What is the content of the safety production responsibility system?

A: The content of the safety production responsibility system, in a nutshell, is the production leadership at all levels of the enterprise, and should be responsible for the safety work in the safety production of the unit; all levels of engineering and technical personnel, functional departments and production workers are in their respective Responsibility for safety work within the scope of responsibility.

48. What are the three principles of local gas emissions?

Answer: Power outage, evacuation, and limited quantity, that is, the area where the gas is discharged during the discharge period must be blackout and evacuated, strictly control the concentration of discharged gas, prohibit the wind from blowing, and clarify the specific implementation measures.

49. What are the rules for the order of gas emissions?

Answer: (1) When discharging gas, it is necessary to go from the outside to the inside, and after the advanced wind returns to the wind, it is carried out in sequence. It is strictly forbidden to discharge two local fans at the same time in one mining area. (2) When the gas in the series ventilation area is excluded, the discharge should be started from the first bureau fan. The first local fan is only after the first station air supply duct gas discharge is over and the series airflow gas concentration drops below 0.5%. The party shall send electricity to discharge.

50, what is the knocking help top?

A: Knocking on the top of the question is a hand-held tool standing in a safe place for "one observation, two questions, three treatments." It is the easiest and most reliable way to check the top plate and the two sets.

51. There are several ways to prevent explosions in electrical equipment. What are they?

A: Three. (1) The flameproof enclosure is used. (2) Adopt a safety spark circuit. (3) Use the lead to cut off the faulty power supply.

52. What are the three major regulations for coal mines?

Answer: "Safety Regulations for Coal Mines" "Operational Regulations" "Operational Procedures".

53. Where are the safe exits of coal mining faces?

A: One passes to the return airway and the other passes to the wind tunnel.

54. What are the safety technical measures for preventing coal wall slabs from coal mining face?

Answer: (1) The coal wall of the working face should be straight and collected, and the pillars should be laid in time to reduce the pressure on the coal wall. (2) When the mining height is high and the coal quality is soft, in addition to playing the pillars, Should also carry out the backing; (3) reasonable shooting, if necessary, with the help of guns, (4) timely support; (5) the wall of the coal wall must not be left; (6) using coal wall curing technology.

55. What are the hazards of series ventilation?

Answer: (1) The air quality of the mining face that is connected in series cannot be guaranteed; (2) The wind resistance is large. Affect the air supply volume of the working face; (3) In the event of an accident, it is easy to expand the scope of the disaster; (4) The air volume is not easy to adjust.

56. When the hoist is found in operation, what should be done with the emergency brake of the safety brake?

Answer: (1) The work brake operation fails; (2) The emergency stop signal is received; (3) It is close to the normal parking position and cannot be decelerated normally; (4) Other faults that must be stopped urgently.

57. What are the operational disciplines that the hoist driver should follow?

Answer: (1) When the driver is operating, the hand is not allowed to leave the handle. It is strictly forbidden to chat with others. After driving, no more calls can be made. (2) Smoking is prohibited during the operation, and it is not allowed to leave the console and do other things that are not related to the operation. No foreign objects that are not related to operation shall be placed on the operation platform; (3) The driver shall not be allowed to sleep or behave after taking over; (4) The driver shall rotate the operation, and the continuous operation time of each person shall not exceed one hour, and substitution is prohibited during operation and operation. Because the body is uncomfortable and unable to adhere to the operation, it can stop midway and contact the wellhead signal worker, and be replaced by another driver; (5) The warning call to the guardian driver is forbidden.

58. What is the content of the hoist driver “three not open” and “five attention”?

Answer: The three do not open: the signal is not clear, the signal is not open, and the starting state is not normal.

5 Note: Pay attention to whether the voltage and current meter indications are normal, pay attention to whether the brake is reliable, pay attention to whether the depth indicator indicates accuracy, pay attention to whether the wire rope is arranged neatly (wound type), and pay attention to whether the lubrication system is normal.

59. What is the content of the “three knowledge”, “four meetings” and “five strictes” of the driver of the hoist?

Answer: Sanzhi: Know the structure of the equipment, know the performance of the equipment, and understand the working principle of the safety facilities.

Four sessions: will operate, will be repaired, will be maintained, will be troubleshooting

Five strict: strict implementation of the handover system, strict implementation of operational procedures, strict implementation of the key site management system, strict implementation of inspections, and strict implementation of post training.

60. How is the number and measurement time of mine air volume measurement specified?

A: At least every three days, a comprehensive air volume measurement is carried out, and the temperature of gas and carbon dioxide concentration is measured. The same main fan in the same mine must measure the air volume and temperature on the same day; the same mine with multiple main fans should try to On the same day, the air volume and temperature are measured, and the fan air volume is measured every ten days, and the air leakage is checked once a month.

61. How is the concentration of gas in the underground working place specified?

Answer: When the concentration of gas in the working face and other working places reaches 1%, the electric drill must be stopped. When the gas concentration in the airflow within 20m near the blasting site reaches 1%, blasting is strictly prohibited; the motor or its switch installation location is 20m. When the gas concentration in the internal airflow reaches 1.5%, the work must be stopped, the power supply is cut off, and the personnel are evacuated for disposal.

Forging Butterfly Valve And Flange

Forging Butterfly Valve,Forging Flange,Forged Accessories,Butterfly Control Valve

Zhejiang Huaguang Seiko Co.,Ltd. ,