2017 Coal Mine Safety Knowledge Competition Question Bank and Answers (2)

51. What are the three principles that must be followed when discharging gas?

Answer: Evacuate people, cut off power, and limit gas emissions.

52. What? Three specialties and two locks?

Answer: Three specialties and two locks refer to: special transformers, special switches, special cables; two locks refer to gas and electricity locks, wind power atresia.

53. What must be set up at the boundary between adjacent mines?

Answer: Waterproof coal pillars must be set up.

54. How many methods are there for mine hydrogeological exploration?

Answer: (1) Geophysical prospecting; (2) Drilling; (3) Geochemical prospecting; (4) Hydrogeology Experiments etc.

55. What are the emergency principles for water inrush accidents?

Answer: Report the disaster, actively rescue, evacuate safely, avoid disasters properly, and reduce losses.

56. What is the function of water cannon mud?

Answer: First, it can play a sealing role; second, when the explosive explodes, the water in the water cannon mud will form a mist distribution. In the air, it can reduce dust, cool down and absorb toxic and harmful gases.

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

Answer: ⑴ Active rescue. ⑵ Evacuate safely. ⑶ Take shelter properly and wait for rescue.

58. When a gas or coal dust explosion occurs underground, what should the underground personnel do after the shock wave passes?

Answer: After bringing the self-rescuer, identify the direction and follow the disaster evacuation route Enter fresh wind as soon as possible and evacuate the disaster area against the wind; if the roadway is damaged and cannot be passed or it is unclear whether the evacuation route is safe, you should choose a temporary refuge cave and wait patiently for rescue.

59. Generally speaking, what are the upper and lower concentration limits for coal dust explosions? What is the concentration with the strongest explosive power?

Answer: The lower limit concentration for coal dust explosions is generally It is 30?50g/m3, and the upper limit concentration is 1000?2000g/m3. Among them, the concentration with the strongest explosive power is 300?400g/m3.

60. The "Procedures" stipulate that what should be done after the mining of the mining face is completed?

Answer: It must be permanently closed within 45 days.

61 , What are the regulations on the concentration of oxygen and carbon dioxide in the air inlet flow of the mining working face?

Answer: The regulations stipulate that the oxygen concentration in the air inlet flow of the mining working face shall not be less than 20%, and the carbon dioxide concentration shall not exceed 0.5 %.

62. Among the toxic and harmful gases in mines, what are the components, hazards and sources of carbon monoxide?

Answer: Carbon monoxide (CO) is a colorless, tasteless, and odorless gas. ; It is flammable, and when the content is between 13 and 75%, it can cause an explosion in case of fire; carbon monoxide is extremely poisonous, and when the content reaches 0.4%, people can be poisoned and die in a short time. The sources are: underground fires; gas and coal dust explosions; blasting work.

63. What is "three-person interlocking"?

Answer: "three-person interlocking" firing means that before firing, the firing crew will hand over the warning sign to the team leader. The team leader will send someone to be on guard, issue the order for firing, check the condition of the roof and brackets, and hand over the firing order plate he carries to the gas inspector. After the gas inspector passes the inspection of gas and coal dust, he will hand over the firing order plate he carries. Give it to the cannon shooter, who will give the cannon whistle and fire off the cannon. After the cannon is fired, each of the three cards will return to its original owner.

64. What is the "one shot and three inspections" system?

Answer: One shot and three inspections means: the blasting locations in the mining working face are before loading, before blasting, and after blasting. And check the gas concentration within 20 meters of the blasting site. When the gas concentration reaches 1%, the blasting work must be stopped.

65. How is the distance between the air duct of the excavation working face and the head-on direction defined?

Answer: Coal and semi-coal in high gas mines, low gas mines, high gas areas and abnormal areas The distance between the air duct at the head of the rock excavation shall not be greater than 5 meters from the head, and the rock tunnel shall not be greater than 8 meters; the distance between the air duct at the head of the coal and semi-coal mines in low gas mines shall not be greater than 8 meters, and the distance from the rock tunnel shall not be greater than 10 meters.

66. What are the main sources of fire that cause gas explosions?

Answer: Mainly include open flames, electric sparks, electrical appliance failure, arcs or components on hot metal surfaces, gunfire flames, Natural ignition and friction sparks.

67. Why should underground personnel wear self-rescuers?

Answer: When an unexpected disaster occurs underground, every employee in the disaster area or affected area is threatened by the disaster. . The self-rescuer is a small, portable device that prevents poisoning from poisonous and harmful gases and protects people's breathing. Therefore, underground personnel must wear self-rescuers.

68. When going down the mine, which personnel carry portable gas alarms?

Answer: Mine director, technical director, ventilation zone captain, engineering and technical personnel, squad leader, blaster, mobile Electrical fitters, supervisors.

69. What are the preparations before the gas man goes down the well?

Answer: The gas man should carry a gas detector, gas rod, rubber tube, thermometer, record book and pen. If there is a naturally igniting coal seam, also carry a carbon monoxide detector. When receiving the gas identification device, you should check whether the medicine, circuit, air tightness, and spectral stripes meet the requirements.

70. How many types of mine water damage are there?

Answer: (1) Roof water damage; (2) Floor water damage; (3) Hole water damage; (4) Faults and subsidence Column water damage; (5) Water damage from poorly sealed boreholes.

71. What are the three lines of Laokong water accumulation area?

Answer: water accumulation line, water exploration line and warning line.

72. What are the signs before water breaks out at the working surface or other places?

Answer: The signs before water breaks out at the working surface or other places are: redness, sweating, cold air, and Fog, water squeaking, increased water spraying on the roof, pressure on the roof, bulging or cracks in the bottom plate, water seepage, muddy water, odor, etc.

73. What measures should be taken when signs of water inrush are detected?

Answer: Operations must be stopped immediately, reported to the dispatching room, an alarm must be issued, and all personnel in locations threatened by water must be evacuated.

74. What is a fault? How many types are there?

Answer: The crust changes, the strata break, and relative displacements occur vertically, horizontally or obliquely along the fracture surface. The phenomenon is called fault. There are three types of faults: normal faults, reverse faults and translational faults.

75. Before supporting, under what protection must we use long-handled tools to knock on the top of the roof and remove the hanging gangue and loose coal?

Answer: In Under the protection of existing intact supports

76. The distance between parallel operations on the coal mining face must comply with the regulations. The distance between the pillars and the return pillars must not be less than a few meters; the distance between the pillars and the push conveyor must not be How many meters larger is it?

Answer: Less than 15 meters; larger than 15 meters.

77. When selecting a single hydraulic prop above 1.0m, the maximum height of the support should be several meters less than the maximum designed height of the prop, and the minimum height should be several meters greater than the minimum designed height of the prop. When other props are selected, it is strictly prohibited to exceed the height. Use on high or extra low.

Answer: 0.1 meters; 0.2 meters.

78. What are the three lifelines underground in coal mines?

Answer: Underground telephone lines, air pressure pipelines, and dust-proof sprinkler pipelines.

79. What is the purpose of formulating the "Coal Mine Safety Regulations"?

Answer: To ensure safe production in coal mines and the personal safety of workers, and to prevent coal mine accidents.

80. Within 20m of the connection between all safety exits of the coal mining working face and the roadway, the height of the roadway must not be lower than how many meters for the comprehensive mechanized coal mining face, and how many meters must it not be lower than for other coal mining working faces? Answer: It must not be lower than 1.8 meters; Not less than 1.6 meters.

81. Why are there certain regulations on the eaves of coal mining working faces?

Answer: Because the bonding force between the coal seam and the roof rock is small, if the coal mining working face If there is an eaves on the coal wall, it will gradually separate from the roof and collapse under the action of gravity, which may easily cause personal accidents. Therefore, the coal wall of the coal mining face is required to be straight and perpendicular to the roof and floor.

82. What is the main reason for roof collapse at the upper and lower ends of the coal mining working face?

Answer: ① It is located at the junction of the working face and the upper and lower troughs, with a large roof control area. Stress concentration;

②As the working surface advances, the brackets within the roof control range are frequently replaced, causing the roof to become loose.

83. What are the main accident-prone areas in coal mining faces?

Answer: There are upper and lower safety exits, upper and lower ends, coal wall areas, and return pillar roofing areas.

84. What are the five-character principles that should be followed for underground self-rescue? Answer: destroy, protect, withdraw, hide, and report. 85. When digging or extending an inclined shaft or going down a mountain, you must be in the inclined shaft or going down the mountain. Where to install the anti-road car device, and where to install the strong road car protection device on the excavation working face?

Answer: Upper mouth; upper part.

86. What devices must be installed on the rake installation machine?

Answer: A closed metal rope retaining fence and a guardrail to prevent the rake bucket from exiting the slot.

87. What should the anchor spraying workers do? Four to the bottom?

Answer: (1) Clean the gangue on the working surface before spraying to the bottom; (2) Dig the foundations of the two gangs to the bottom ;(3) Find the pumice and live rock in the tunnel to the bottom; (4) Clean the rebound material after shotcrete to the bottom.

88. What are the requirements for anchor eyes?

Answer: (1) The spacing, row spacing, hole depth and number of anchor eyes must meet the design requirements; (2) The anchor hole should preferably be perpendicular to the rock layer (or perpendicular to the roadway outline), with an angle of no less than 75 degrees; (3) the depth should be consistent with the length and structure of the anchor; (4) the hole should be blown away from rock powder and accumulated water.

89. What regulations should be met for the basic quality items of anchor installation?

Answer: Qualified: The installation is firm and the supporting plate is basically close to the wall and not loose. Excellent: The installation is firm, the supporting plate is close to the wall, and the non-contact parts must be wedged tightly.

90. What is the purpose of the center line and waist line of the tunnel excavation?

Answer: The center line of the tunnel is the direction line to control the tunnel excavation. The waistline is the slope line of the roadway.

91. What is the safety protection of the computer room (cave room)?

Answer: Protective covers, protective fences and hanging hazard warning signs; protective equipment; flammable and explosive items are prohibited.

92. In daily operation, what are the requirements for regular inspections and inspections of flameproof electrical equipment?

Answer: The fastening bolts must be complete and tightened; the cable connections It is firm, reliable and will not be pulled out; the grounding device is reliably connected; the casing has no trace of damage; the temperature rise of each part of the motor is normal.

93. What are the regulations for cable laying?

Answer: Use hooks for hanging; hang neatly, do not cross, do not fall to the ground, and should have appropriate slack; hanging spacing: horizontal or inclined It shall not exceed 3m in the tunnel and 6m in the vertical shaft.

94. According to different protection functions, what are the overcurrent protection devices that should be installed on electrical equipment and its power supply lines?

Answer: short circuit, overload, phase failure, overcurrent Comprehensive flow protection device.

95. What are the types of electric shock? What are the general prevention methods?

Answer: Electric shock and electric injury. Prevent personal contact with or approach live conductors, reduce the voltage used, and strictly abide by various safe electrical work procedures.

96. What is a grounding device? What is grounding protection? What is zero protection?

Answer: The grounding body and grounding wire of electrical equipment are collectively called a grounding device; The metal shell of the equipment is connected to the grounding device, which is called grounding protection; the metal shell of the electrical equipment is connected to the neutral line of the transformer, which is called zero protection.

97. What protection devices must be installed on the shaft lifting device?

Answer: (1) Over-rolling and over-speed protection devices; (2) Overload and under-voltage protection devices; (3) Depth indicator failure protection device; (4) Gate gap protection device; (5) Loose rope protection device; (6) Full warehouse protection device; (7) Deceleration function protection device.

98. When using a roller-driven belt conveyor for transportation, what protection devices must be installed?

Answer: anti-skid protection of the driving roller, coal stacking protection and anti-deviation device, temperature protection, smoke protection and automatic sprinklers.

99. What are the differences between mines that adopt comprehensive mechanized coal mining and other mines.

Answer: The safe clearance distance for vehicles and pedestrians in the roadway.

100. What three types of tests should be done for people and vehicles in inclined lanes?

Answer: A manual gate drop test is conducted once per shift, a static loose rope gate drop test is conducted once a month, and every year Conduct a heavy-load full-speed decoupling test.