Four major actions: coal mine safety education, investigation, rectification, and law enforcement

Four major projects: ventilation and gas, water hazard prevention and control, transportation improvement, and roof management

Five major disasters: water, fire, gas, coal dust, and roof

Six major systems: personnel positioning system, emergency evacuation system, monitoring and control system, compressed air self rescue system, water supply rescue system, communication and liaison system

One slope and three gears: a general term for upper barriers, upper barriers, and lower barriers set up in the inclined roadway to prevent mining cars from running away.

Cracking down on illegal production, operation, and construction activities in coal mines: cracking down on various illegal production, operation, and construction activities in coal mines, rectifying various violations and irregularities in coal mines, timely discovering and rectifying various safety hazards in coal mines, further implementing coal mine safety production responsibilities, regulating coal mine safety production order, building a long-term mechanism for coal mine safety production, effectively preventing and resolutely curbing the occurrence of major accidents in coal mines, and promoting the sustained stability of coal mine safety production situation.

The "Five Determinations" Principle for Hidden Danger Rectification: Responsibility, Personnel, Deadline, Measures, and Funds

Three violations: illegal command, illegal operation, and violation of labor discipline

Three major protections for mine power supply: overcurrent protection, leakage protection, and grounding protection

Three major regulations for coal mines: "Coal Mine Safety Regulations", "Operating Regulations", and "Operating Regulations"

Three specialized, two locked: dedicated transformer, dedicated switch, dedicated circuit; Wind power locking, gas power locking

Three precautions during the rainy season: flood prevention, drainage prevention, and lightning protection.

One ventilation and three prevention measures: ventilation, gas prevention, coal dust prevention, and fire prevention.

Four certificates and one license: Mining License, Safety Production License, Mine Manager Safety Qualification Certificate, Mine Manager Qualification Certificate, Business License.

Exceeding the boundary of the coal seam: Mining outside the coal seam or area specified in the mining license of the coal mine, specifically in the following situations:

（1） Recognized by the land and resources department as exceeding the boundary of the upper layer;

（2） Mining beyond the coal seam layer specified in the mining license;

（3） Mining beyond the coordinate control range specified in the mining license;

（4） Unauthorized mining of security coal pillars.

Security Coal Pillar: To ensure safe production in mines and prevent surface water from leaking into tunnels such as rivers and lakes; Coal pillars reserved for the safety of both sides of the roadway without special measures.

The twelve character policy of safety production: "Safety first, prevention as the mainstay, comprehensive management"

Three simultaneities: The safety facilities of new construction, renovation, and expansion projects of production and operation units must be designed, constructed, and put into production and use simultaneously with the main project.

The "Sixteen Character" Work Principle for Mine Water Prevention and Control: "Predict and forecast, investigate if there are doubts, explore before excavating, treat before mining"

Five comprehensive measures for preventing and controlling mine water hazards: prevention, blocking, dredging, drainage, and interception.

The "Twelve Character" Policy for Gas Control: First Extract, then Extract, Determine Production by Wind, Monitor and Monitor

The "Sixteen Character" Work System for Gas Prevention and Control: Reliable Ventilation, Standard Extraction, Effective Monitoring, and Effective Management

Three super: enterprise overcapacity, super intensity, and over staffing production

Three major protections for mine power supply: overcurrent protection, leakage protection, and grounding protection

The three elements of coal seam occurrence: strike, dip, and dip angle

'One shot, three inspections': Gas concentration should be checked before loading, before firing, and after firing

Three person chain firing processing ": The firing officer hands over the warning sign to the team leader, who sends someone to guard, issues the firing order, and checks the condition of the roof support. The firing order sign he carries is handed over to the gas inspector. After the gas inspector checks the gas and coal dust to be qualified, he hands over the firing sign he carries to the firing officer, who emits a firing whistle to start firing.

The five mine level "chiefs" equipped in coal mines: mine manager and safety deputy mine manager, production deputy mine manager, mechanical and electrical deputy mine manager, and technical deputy mine manager (chief engineer)

One stop and four non-stop: After the coal mine stops production, there will be no power outage, no wind interruption, no gas inspection, and no drainage.

Special occupations: Gas inspector (tile inspector), electrical fitter, safety administrator, underground blasting worker, main winch driver, coal mining machine driver.

Underground power supply has three no's, four has, two is complete, three is complete, and three insists

Three Nos: No chicken claws, no sheep tail, no visible joints;

Four have: overcurrent and leakage protection devices, screws and spring washers, sealing rings and baffles, and grounding devices;

Two in one: Cable hanging neatly, equipment chamber clean and tidy;

Three in one: complete protective devices, complete insulation equipment, and complete drawings and data.

Three Adherences: Persist in using leak detection relays, persist in using coal-fired drills, lighting and signal comprehensive protection, and persist in using wind power and gas electric interlocking.

coal seam

Thin coal layer: coal seams with a thickness of less than 1.3m during underground mining; Coal seams with a thickness of less than 3.5m during open-pit mining.

Medium thick coal seam: a coal seam with a thickness of 1.3-3.5m during underground mining; Coal seams with a thickness of 3.5-10m during open-pit mining.

Thick coal seam: coal seams with a thickness of over 3.5m during underground mining; Coal seams with a thickness of over 10m during open-pit mining.

Near horizontal coal seam: coal seams with an inclination angle of less than 8 ° during underground mining; Coal seams with an inclination angle of less than 5 ° during open-pit mining.

Gentle inclined coal seam: a coal seam with an inclination angle of 8-25 ° during underground mining; Coal seams with a dip angle of 5-10 ° during open-pit mining.

Medium inclined coal seam: also known as "inclined coal seam". Coal seams with an inclination angle of 25-45 ° during underground mining; Coal seams with a dip angle of 10-45 ° during open-pit mining.

Steep coal seam: a coal seam with a dip angle of 45 ° or more during underground or open-pit mining.

Development roadway: a basic roadway excavated for the development of a mining field. Such as underground parking lot, transportation roadway, main return airway, main stone gate, etc.

Preparation roadway: The main roadway excavated to prepare for the mining area. Such as up and down the mining area, mining area parking lot, etc.

Mining roadway: also known as "coal mining roadway". Forming a coal mining face and the tunnels that serve it. Such as cutting eyes, working face transportation lanes, working face return air lanes, etc.

Shimen: A horizontal rock roadway that is orthogonal (perpendicular) or oblique to the direction of the coal seam.

Transportation roadway: a horizontal roadway that serves the transportation of the entire mining level or stage.

General return airway: a return airway that serves the entire mine or one wing of the mine.

Liaison Lane: formerly known as "Crossover". Connect two short alleys.

Coal mining method: The coordination between coal mining technology and the layout of mining tunnels in terms of time and space.

Coal mining technology: also known as "mining process". The methods and equipment used in each process of coal mining face, as well as their mutual coordination in time and space.

Downward step coal mining method: a coal mining method in which a lower advanced step shaped working face is arranged in a steeply inclined coal seam and pushed along the strike.

Positive step coal mining method: also known as "inclined step coal mining method". The coal mining method in steeply inclined coal seams is to arrange the upper advanced step shaped working face along the pseudo inclined direction and advance along the strike.

Floor: Adjacent rock layers located beneath the coal seam.

Pseudo roof: an extremely unstable rock layer located above the coal seam that falls with mining, with a thickness generally below 0.5.

Direct roof: A rock layer located above a coal seam or pseudo roof that has a certain degree of stability and can collapse on its own after being moved or returned.

Top collapse: also known as "roof collapse". Accidents of roof rock falling in mining workspaces or other underground work locations.

Fragmentation: The phenomenon of coal or rock collapse under the pressure of mining.

Single hydraulic strut: a single retractable strut that utilizes hydraulic pressure to generate working resistance and achieve lifting and unloading.

Methane sensor: a device that converts the concentration of methane in the air into an output signal with a certain corresponding relationship.

Wind speed sensor: a device that converts the variable of air flow velocity into an output signal with a certain corresponding relationship.

Equipment start stop sensor: a device that detects the start stop status of the equipment and converts it into a predetermined output signal. Main ventilation fan: a ventilation fan installed on the ground that supplies air to the entire mine, one wing, or one partition.

Local ventilation fan: a ventilation fan that supplies air to a specific location underground.

Windshield: also known as "regulating air door". A window installed on a damper or other ventilation facility that can adjust the airflow.

Wind wall: also known as "closed". A partition wall set up in the tunnel to cut off the airflow.

Wind barrier: a facility that guides airflow in mine tunnels or working faces.

Wind bridge: a facility located at the intersection of inlet and outlet air that prevents mixing of inlet and outlet air.

Wind door: A door set up in a tunnel that separates airflow through personnel and vehicles.

A duct that guides airflow in a certain direction

Pneumoconiosis: an occupational disease mainly characterized by pulmonary fibrosis caused by long-term inhalation of large amounts of fine dust.

Silicosis: formerly known as "silicosis". Pneumoconiosis caused by long-term inhalation of large amounts of rock dust containing crystalline free carbon dioxide.

Coal lung disease: pneumoconiosis caused by long-term inhalation of coal dust.

Coal silicon lung disease: formerly known as "coal silicon lung disease". Pneumoconiosis caused by long-term inhalation of coal dust and rock dust containing free carbon dioxide.

1、 Coal mining related majors [Coal seam regulations]

1】 Thin coal layer: Coal seams with a thickness of less than 1.3m during underground mining; Coal seams with a thickness of less than 3.5m during open-pit mining.

2】 Medium thick coal seams: coal seams with a thickness of 1.3m-1.5m during underground mining; coal seams with a thickness of 3.5m-10m or more during open-pit mining.

3】 Thick coal seam: coal seam with a thickness of over 3.5m during underground mining; coal seam with a thickness of over 10m during open-pit mining.

4】 Near horizontal coal seams: coal seams with a dip angle of less than 8 degrees during underground mining; coal seams with a dip angle of less than 5 degrees during open-pit mining.

5】 Moderately inclined coal seams: coal seams with an inclination angle of 8-25 degrees during underground mining; coal seams with an inclination angle of 5-10 degrees during open-pit mining.

6】 Tilted coal seam: Coal seams with a dip angle of 25-45 degrees during underground mining, and coal seams with a dip angle of 10-45 degrees during open-pit mining.

7】 Steeply inclined coal seam: coal seams with an inclination angle of 45 degrees or more during underground mining.

8】 Close range coal seam: The distance between coal seams is relatively small, and they have a significant impact on each other during mining

9】 Protective layer: a coal or ore seam that is first opened to eliminate or weaken the risk of protruding impact or ground pressure from adjacent coal seams.

10】 Shimen coal mining: The entire process of Shimen passing through the coal seam from the bottom (top) slate column into the top (bottom) slate.

11】 Safe head value: The maximum head pressure that the aquitard can withstand in the aquifer

[Well Lane and Support]

1】 Jingxiang: All cavities excavated in coal seams or rock formations for mining operations.

2】 Horizontal: The horizontal plane along which the transportation roadway or main return airway is arranged at a certain elevation along the direction of the coal seam.

3】 Stage: A portion of the well field divided along a certain elevation.

4】 Segment: A mining block segment divided along an inclined direction within a stage.

5】 Main transportation roadway: a general term for transportation main roadway, transportation stone gate, and main winch roadway.

6】 Transportation roadway: (stage roadway, horizontal roadway, or main roadway) is a horizontal roadway that serves the entire mining level or stage transportation. The stone gate transportation roadway excavated in the rock layer is called the centralized transportation roadway, which serves several coal seams.

7】 Shimen: A horizontal rock roadway perpendicular or oblique to the direction of the coal seam.

8】 Main winch roadway: (central up and down mountain or centralized up and down mountain) not directly connected to the ground, serving a horizontal or several mining areas and equipped with a winch inclined roadway.

9】 Up the mountain: a sloping roadway excavated along the coal rock layer upwards from the transportation roadway, serving a mining area. Divided by purpose and equipment: conveyor uphill, track uphill, ventilation uphill, and pedestrian uphill.

10】 Downhill: A sloping roadway excavated along the coal rock layer below the transportation roadway to serve a mining area. Divided by purpose and equipment: conveyor downhill, track downhill, ventilation downhill, and pedestrian downhill.

11】 Step eave: The staggered distance of steps in the working face of a step

12】 Laokong: a general term for goaf, old kilns, and abandoned shafts and alleys.

13】 Goaf: a space that is no longer maintained after mining

14】 Anchor spray support: a combination of anchor rods and sprayed concrete or grout support

15】 Anchor rod (cable) anchoring strength: (10KN is about 1 ton)

(1) A proportion of not less than 10% and a time interval of not more than 3 days for permanent support top anchor

The anchoring force shall not be less than 150KN (20MPa), the anchoring force of the roadway side anchor shall not be less than 120KN, the anchoring force of the threaded steel anchor shall reach 100KN (15MP) to be excellent, and the qualified anchoring force shall reach 90KN (10MPa). If the unqualified anchor fails, it shall be repaired within a range of 20cm, and the leakage length shall be ensured to be 3-5cm. The maximum sinking amount of the anchor support for both sides shall be 27.85mm, and the minimum sinking amount shall be 13.27mm; The maximum subsidence of the top plate is 19.12mm, and the minimum subsidence is 4.36mm;

(2) The design of pre tensioning anchor force of 150KN (20MPa) is excellent, and the maximum anchoring force of 260KN (36MPa) ensures a leakage length of 15-20cm. During the installation of anchor cables, the inner end of 20cm to 30cm should be artificially broken.

16】 Spray support: a general term for using sprayed cement mortar and sprayed concrete as support for shafts and tunnels

17】 Frozen wall intersection: The phenomenon where the frozen cylinders of adjacent frozen holes gradually expand and connect to each other, forming a closed frozen wall

18】 Stop grouting rock cap: during pre grouting of the working face in the well. A rock column temporarily located above or in front of the aquifer that can withstand the maximum grouting pressure (pressure) and prevent leakage and running of grout towards the excavation face.

19】 Concrete grout stop pad: a concrete structure constructed above the aquifer during pre grouting of the wellbore working face, capable of withstanding the maximum grouting pressure (pressure) and preventing grout leakage and leakage in the roadway excavation working face.

20】 Rock burst: A dynamic phenomenon in which the surrounding rock mass of a well or working face experiences sudden and severe damage due to the instantaneous release of elastic deformation energy. Often accompanied by phenomena such as coal rock ejection, loud noise, and air waves.

2、 One way and three prevention related majors (effective air volume in mines not less than 85%)

1】 Main airway: a general term for the main intake airway, main return airway, main intake airway, and main return airway.

2】 Partition ventilation (parallel ventilation independent ventilation): The ventilation method in which the return air from each underground air consumption location directly enters the return air roadway or the main return air roadway of the mining area.

3】 Series ventilation: a ventilation method in which the return air from each underground air consumption location enters other air consumption locations again.

4】 Diffusion ventilation: a method of ventilating a local area by utilizing the natural diffusion motion of molecules in the air.

5】 Independent ventilation: The airflow that separates from the main intake duct, passes through the blasting material warehouse or charging chamber, and then enters the main return duct.

6】 Full pressure: The total pressure difference between the outlet and inlet sides of the main ventilation fan in the ventilation system.

7】 Fire wind pressure: The additional wind pressure generated by the flow of high-temperature smoke through tunnels with height differences when a fire occurs underground.

8】 Local ventilation: a method of ventilating local points using the air pressure generated by local ventilation fans or main ventilation fans.

9】 Circulating air: The return air of a local ventilation fan, partially or completely entering the inlet air of the same ventilation fan again.

10】 Upward ventilation: a ventilation method in which the airflow flows from bottom to top along the coal mining face.

11】 Downward ventilation: a ventilation method in which the airflow flows from top to bottom along the coal mining face.

12】 Gas: Methane is a harmful gas mainly composed of coalbed methane in mines. (Evacuate personnel when gas concentration reaches 1.5% within a range of 20 meters)

13】 Gas mine: a general term for low gas mines and high gas mines.

14】 Gas outburst: The phenomenon of uniformly releasing gas into the underground air from coal seams, rock layers affected by mining, as well as from fallen coal and gangue.

15】 Specific regulations on the concentration of carbon dioxide in underground gas:

(1) The concentration of gas and carbon dioxide in the airflow entering the connected working face shall not exceed 0.5%.

(2) When the gas concentration in the return airway of the mining area and the return airway of the mining face exceeds 1.0% and the carbon dioxide concentration exceeds 1.5%, personnel must be immediately evacuated, operations must be stopped, and measures must be taken to deal with them in a timely manner.

(3) When the gas concentration and carbon dioxide concentration in the airflow of the mining face reach 1.5%, personnel must be immediately evacuated, operations must be stopped, and measures must be taken to deal with them in a timely manner.

16】 Gas (carbon dioxide) outburst: The phenomenon of a large amount of abnormal gas (carbon dioxide) gushing out from coal or rock fractures, holes, or boreholes. When the amount of gas emitted within a range of 20 meters is greater than or equal to 1.0 cubic meter per minute and the duration is more than 8 hours, the mining area is designated as a dangerous area for gas (carbon dioxide) emission

17】 Rock powder: a specially produced inert powder used to prevent explosions and their spread.

18】 Coal (rock) and gas outburst: an abnormal dynamic phenomenon in which broken coal, rock, and gas are suddenly thrown out of the coal or rock mass into the mining space under the combined action of geostress and gas. The term "outburst" referred to in Chapter 4 of Part 2 of this regulation refers to coal and gas outbursts, sudden coal outbursts, and rock and gas outbursts.

19】 Grade hole: an abstract concept that imagines a panel in a certain space or an infinite space, with no dry holes on the panel. The volume or speed of airflow passing through the holes is calculated using a formula

20】 Gas accumulation: Gas accumulation refers to the accumulation of gas with a volume of 0.5 cubic meters and a gas concentration of 2% or more.

21] Twelve sub policies for gas control: first pumping, then mining, wind based production, monitoring and surveillance

22] Mine Backwind Classification: Whole Mine Backwind and Local Backwind

23] Requirements for gas and carbon dioxide in mining face: The oxygen concentration in the inlet airflow of the mining face shall not be less than 20%, and the carbon dioxide concentration shall not exceed 0.5%. When the gas concentration in the return airway of the mining area or the return airway of the mining face exceeds 1.0% or the carbon dioxide concentration exceeds 1.5%, work must be stopped and personnel must be evacuated from the mining area.

24] Dust prevention wind speed: From the perspective of dust prevention, the most suitable wind speed is 1.2-1.6m/s

25] Water fire extinguishing precautions: When using water for fire extinguishing, the gas concentration must not exceed 2%

26] Gas explosion conditions: gas concentration 5-16%, temperature 650-750 ℃, oxygen concentration above 12%

27] Coal dust explosion conditions: coal dust concentration of 45-2000 grams/m ⊃;, Temperature 610-1050 ℃, oxygen concentration above 18%.

28] High (low) gas mine: The relative gas emission of the mine is greater than (less than or equal to) 10 cubic meters per ton, or the absolute emission is greater than (less than or equal to) 40 cubic meters per ton.

29] Coal dust accumulation standard: Coal dust accumulation with a thickness exceeding 2mm and a length exceeding 5m.

30] Water accumulation standard: sewage with a depth exceeding 10 centimeters and a length exceeding 5 meters.

31] Fire pipeline installation standards: Ground fire water tanks should maintain a water volume of no less than 200m3, and underground fire pipeline systems should have branch pipes and valves installed every 100m. Belt conveyor tunnels should have branch pipes and valves installed every 50m, and other pipelines should have a three-way valve installed every 100m. The design complies with Article 218 of the Coal Mine Safety Regulations.

32] Installation standards for explosion-proof water bags: Explosion proof implementation refers to (explosion-proof water curtain, explosion-proof water shed, rock powder shed, and automatic explosion-proof shed).

The vertical distance between the edge of the water bag and the roadway wall, pillars, and roof (beam) shall not be less than 100mm, and the distance between the water bag and the roof (beam) shall not be greater than 1.0m. The spacing between water shed rows is 1.2-3.0m, and the vertical distance between the bottom of the water bag and the top plate shall not exceed 1 meter.

(1) The water volume in the main water shed's water bags should be guaranteed to be 60L, and the total number of water bags should not be less than 104 (considering insufficient water volume). Four water bags should be hung in each row, and the total water consumption should not be less than 400L/m;, The length of the shed area is 41.6-50 meters

(2) The auxiliary water shed water bag should ensure 60L, and the total water consumption of the water shed should not be less than 200 L/m;. The length of the shed area shall not be less than 20 meters.

33] Installation standards for local ventilation fans:

1. Install it at a distance of no less than 10 meters from the fresh air outlet and at a height of more than 0.3m above the ground.

34] Dust removal at working face: all coal transfer points underground must be equipped with complete spray dust reduction devices. The air inlet and return lanes of the coal mining face, the air inlet inclined shaft of the main air inlet lane and the driving face must be installed with purified water curtains, and the upper and lower outlets of the coal mining face must not exceed 30m. The distance from the excavation face to the front shall not exceed 50m

3、 Transportation system and cage system

1】 Main winch roadway: (central up and down mountain or centralized up and down mountain) not directly connected to the ground, serving a horizontal or several mining areas and equipped with a winch inclined roadway.

2】 Locomotive: a general term for overhead electric locomotives, steam locomotives, battery locomotives, and diesel locomotives.

3】 Electric locomotive: a general term for overhead electric locomotives and battery powered locomotives.

4】 Monorail crane: a transportation equipment consisting of a driving or towing vehicle (wire rope traction), a braking vehicle, a load-bearing vehicle, etc. that operates on a suspended monorail.

5】 Rail car: a vehicle equipped with rail wheels that travels on the track.

6】 Gear locomotive: a mining locomotive that increases its climbing ability by using the racks on the track bed and the gears on the locomotive.

7】 Rubber wheel locomotive: a mining locomotive with steel wheel treads coated with special materials to increase adhesion coefficient and improve climbing ability.

8】 Lifting device: a general term for winches, friction wheels, pulleys, guide wheels, wire ropes, irrigation channels, lifting containers, and safety devices.

9】 Main lifting device: a lifting device containing a winch for lifting materials with a drum diameter of 2 meters or more.

10】 Fall arrester: a protective device that prevents the lifting container from falling when the steel wire rope or connecting device breaks.

11】 Car blocking device: a general term for car blocking devices and barriers

12】 Car barrier: a safety device installed on the way up and down the mountain to prevent accidents caused by mining cars.

13】 Car stopper: a device used to stop and position mining cars on the side of the loading track or in the cage or car dumping machine.

14】 Sports car protection device: a device or facility installed in an inclined shaft roadway that can prevent vehicles from breaking ropes or disengaging during operation.

15】 Maximum internal and external deviation angle: The angle formed by the straight line of the steel wire rope from the vertical plane of the crown wheel center to the drum and the straight line of the steel wire rope from the innermost and outermost positions on the drum to the center of the crown wheel.

16】 Common brake: an operation (working) brake used for normal operation and control of winches.

17】 Safety brake: When an abnormal phenomenon occurs in the lifting system and an emergency stop is required, an emergency braking device can be implemented according to a predetermined procedure, also known as an emergency brake or safety brake

18】 Tank channel: a guiding device for lifting containers to move up and down in the vertical shaft. Tank channels can be divided into rigid tank channels (wooden tank channels, steel rail tank channels, composite steel tank channels) and flexible tank channels (steel wire rope tank channels)

19】 Tank seat (gate leg, tank holder): A device for holding tanks when loading and unloading vehicles at the bottom of a well or wellhead.

20】 Shaking platform: a movable platform used to connect the tracks at the wellhead and horsehead during the loading and unloading of tank cages

21] Mining explosion-proof special type electric locomotive: The electric locomotive, controller, lighting fixtures, cable plugs, etc. are explosion-proof type, and the battery adopts special explosion-proof measures for the battery electric locomotive.

22] Overhead passenger device: A passenger device that uses an endless rope system or overhead track system to transport personnel in inclined shafts and tunnels, including various types of passenger devices such as pedestrian aids, pedals (waiting), and monorail cranes.

23] Belt protection: (type and installation position)

1. Longitudinal tearing protection is limited to the belt overlap and installed 15 meters before the coal outlet.

4、 Electrical equipment

1】 Mining explosion-proof electrical equipment (Class 1): refers to explosion-proof electrical equipment produced according to the GB3836.1-2000 standard specifically for use underground in coal mines. (Industrial symbol is Class 2)

(1) Explosion proof electrical equipment (d): Explosion proof electrical equipment with an explosion-proof shell that can withstand the explosive pressure generated by the detonation of its internal explosive gas mixture and prevent explosive products from penetrating the explosion-proof gap and igniting the explosive mixture around the shell.

(2) Increased safety electrical equipment (e): Electrical equipment with a structure that does not generate arcs, sparks, or high temperatures that may ignite explosive mixtures under normal operation, measures are taken to improve safety to avoid these phenomena under normal and recognized overload conditions.

(3) Intrinsically safe electrical equipment (i): Electrical equipment with all circuits being inherently safe. It refers to the situation where under specified test conditions, the electrical sparks and thermal effects generated during normal operation or specified fault conditions cannot ignite the specified explosive mixture.

(4) Positive pressure electrical equipment (p): Electrical equipment with a positive pressure housing. Explosion proof electrical equipment that is filled with protective gas inside the casing and maintains a pressure (pressure) higher than that of the surrounding explosive environment to prevent the entry of external explosive mixtures.

(5) Oil filled electrical equipment (o): Explosion proof electrical equipment in which all or part of the components are immersed in oil and cannot ignite explosive mixtures on the oil surface or outside the casing.

2】 Leakage detection device: a device that can automatically cut off the power supply when the leakage current in the power grid reaches a dangerous value.

3】 Undervoltage release protection device: a relay protection device that can automatically cut off the power supply when the supply voltage drops to the specified limit value.

4】 Flame retardant cable: a cable that burns slowly when ignited by fire and extinguishes on its own after leaving the source of ignition.

(1) Cable type:

1. Armored cables, rubber sheathed cables (ordinary rubber sheathed cables, flame-retardant rubber sheathed cables, shielded rubber sheathed cables), plastic cables.

(2) Cable hanging standard:

(1) Cable should be hung in cable trenches in horizontal tunnels or tunnels with an inclination angle of less than 30 degrees; (2) Cables should be laid using cable clamps or other clamping devices in vertical shafts or tunnels with an inclination angle of 30 degrees or more. The clamping devices should be able to withstand the weight of the cables and should not damage them. (3) The suspended cables in horizontal tunnels or inclined shafts should have a certain degree of looseness, be able to freely fall off under force, and maintain a certain height, so as not to fall onto the tracks and transport planes when dropped. (4) Cables must be hung above air ducts and water pipes at a distance of 0.3 meters, power cables below communication and signal lines at a distance of 0.1 meters, high-voltage cables at a distance of 0.1 meters, and low-voltage cables at a distance of 50mm. When there are gas discharge pipelines in the roadway, cables and gas discharge pipelines must be hung separately on both sides of the roadway.

5】 Grounding device: a general term for various grounding electrodes, grounding wires, and grounding leads.

6】 General grounding grid: a grounding system that connects all grounding devices that should be connected using conductors.

7】 Local grounding electrode: a grounding electrode buried separately in a centralized or individual location containing electrical equipment (including junction boxes connecting power armored cables).

8】 Grounding resistance: The ratio of the grounding voltage to the current flowing into the earth through the grounding electrode.

9】 Use of portable electrical measuring instruments: Ordinary portable electrical measuring instruments must be used when the gas concentration is below 1%.

10】 Coal mine voltage levels: (Level 1, Level 2, Level 3):

(1) High voltage: 35000V, 10000V, (6000V, 3300V comprehensive mining feeding voltage)

(2) Low voltage: 1140V (comprehensive mining power supply distance 1500m), 660V, (underground low-voltage power voltage distance 1000m) 380V (ground low-voltage power voltage distance 500m), 127V (lighting signal voltage distance 300m), 36V (underground control circuit voltage distance about 30m)

11】 Overcurrent: The working current flowing through electrical equipment or cables exceeds the rated value.

12】 Short circuit: Refers to a situation where the current does not flow through the load, but two or three wires are directly short circuited to the circuit

13】 Overload: The working current flowing through electrical equipment or cables exceeds the rated current value, and the duration of the overcurrent also exceeds the allowable time.

14】 Temperature regulations for electrical equipment cables: The temperature of the motor shall not exceed 80 ℃ for general motors and 135 ℃ for H grade motors, based on the insulation level (B grade, 125 ℃. H grade, 180 ℃). The cable temperature should not exceed 50-55 ℃. The temperature of the gearbox casing shall not exceed 60 ℃, the temperature of the bearings (sliding bearings shall not exceed 65 ℃, rolling bearings shall not exceed 75 ℃), the temperature of the hydraulic oil shall not exceed 40-60 ℃, and the temperature of the emulsion shall not exceed 50 ℃ -55 ℃ at 40 ℃.

15】 Grounding requirements for electrical equipment: Grounding electrodes are divided into main grounding, auxiliary grounding, and grounding grid

(1) Main grounding electrode: Steel plate with an area of not less than 0.75 square meters and a thickness of 6mm, and busbar with a cross-section of not less than 100mm; Galvanized steel plate, with connecting wires of no less than 50mm; Bare copper wire.

(2) Auxiliary grounding electrode:

1. Steel plate with an area of 0.6 square meters and a thickness of 3mm is placed in the ditch.

2. The steel pipe has a length of 1.5m, a diameter of 35mm, and 20 small eyes with a diameter of 5mm are vertically buried underground.

3. Steel pipes with a length of 0.75m and a diameter of 22mm are vertically buried underground at a distance of 5m.

16】 After a power outage, the same level of voltage tester was not used for electrical discharge testing, or the gas concentration within 10 meters (below 1.0%) was not checked.

17】 Cable laying:

1) Cable should be hung in cable trenches in horizontal tunnels or tunnels with an inclination angle of less than 30 degrees;

2) Cables should be laid using cable clamps or other clamping devices in vertical shafts or tunnels with an inclination angle of 30 degrees or more. The clamping devices should be able to withstand the weight of the cables and should not damage them.

3) The suspended cables in horizontal tunnels or inclined shafts should have a certain degree of looseness, be able to freely fall off under force, and maintain a certain height, so as not to fall onto the tracks and transport planes when dropped.

4) The spacing between cable suspension points shall not exceed 3 meters in horizontal or inclined shafts, and 6 meters in vertical shafts.

5) Cable suspension position: Cables should not be hung on air ducts or water pipes, and should not be exposed to water. It is strictly prohibited to hang any objects on cables. When cables, compressed air ducts, and water pipes are laid on the same side of the tunnel, they must be laid above the pipes at a distance of at least 0.3 meters. In tunnels with gas discharge pipelines, cables (such as communication and signal cables) must be hung separately from the gas discharge pipelines on both sides of the tunnel. Communication and signal cables in the wellbore should be separated from power cables on both sides of the roadway. If conditions are limited, they should be laid 0.3 meters (30cm) away from the power cables, and 0.1 meters above the power cables in the wellbore. The distance between high and low voltage cables on the same side of the tunnel should not be less than 0.1 meters, and the distance between high and low voltage cables should not be less than 50mm (5cm).

5、 Coal mining

1】 Comprehensive mining: The basic processes of coal breaking, loading, transporting, supporting, and roof management in the coal mining face are mechanized.

2】 Unidirectional coal cutting: a coal cutting method in which the coal mining machine travels back and forth along the entire length of the working face once, with only one cut.

3】 Underground mining methods: longwall caving mining method, top coal caving mining method, steeply inclined mining method, backfill mining method, hydraulic mining method, continuous mining machine, and room and pillar mining method. Reliable anti-skid devices must be installed when the working face inclination angle is above 15 degrees.

4】 The coal mining technology of longwall working face includes: comprehensive mining, general mining, and blasting coal mining method

5】 Unit spray: the shearer must be equipped with an internal and external spray device, the external spray pressure is not less than 1.5 MPa, and the internal spray pressure is not less than 2 MPa. If the internal spray cannot be used normally, the external spray pressure is not less than 4 MPa

6】 Inter rack spray: the pressure of inter rack spray and coal tap shall not be less than 1.5 MPa.

7】 When someone is working within 3 meters of replacing the cutting teeth and drum, it is necessary to protect the roof, cut off the power, turn on the coal mining machine isolation switch and clutch, and lock the working face conveyor.

8】 During blasting, supports and individual hydraulic supports within a 10 meter radius of the working face must be reinforced

9】 Blasting warning range: not less than 100 meters for straight lanes and not less than 70 meters for curved lanes.

10】 Pump station pressure: The pressure of the emulsion pump station reaches 31.5 MPa.

The pressure of spray pump reaches 8 MPa.

11】 Transport aircraft: The curved section of the transport aircraft shall not be less than 20 meters, and the lagging drum shall be 12 meters to prevent damage to the scraper dumbbell pin, coal machine sliding shoes, drum, rocker arm and other objects.

12】 Bracket gap: The gap between brackets should be less than 200mm, and the bracket side guard should be fully utilized.

13】 Initial support force of the support: The initial support force of the hydraulic support on the working face must reach 252 bar or above to prevent the support from being crushed due to roof collapse.

14】 Individual initial support force: The initial support force for a single column with a diameter of 80mm is 60KN, and for a column with a diameter of 100mm it is 90 KN.

15】 Safety exits: It is necessary to ensure that the distance between the safety exits of the two chutes is not less than 0.7 meters, the height is not less than 1.8 meters, and the two exits are free of debris, silt, and accumulated water.

6、 Excavation

1】 Unit spray: the water pressure used for internal spray is not less than 3 MPa, and the water pressure used for external spray is not less than 1.5 MPa. If the internal spray cannot be used normally, and the water pressure used for internal spray is less than 3 MPa, or there is no internal spray device, the external spray and dust removal device must be used.

2】 Unit shutdown: When the tunneling machine stops working and undergoing maintenance, as well as during shift handover, the cutting head must land, and the power switch and magnetic starter isolation switch of the tunneling machine must be disconnected.

3】 The methane sensor alarm concentration of the unit is ≥ 1.0%, the power-off concentration is ≥ 1.5%, the restoration concentration is<1.0%, and the power-off range is the power supply of the tunneling machine.

4】 Standard for setting gas monitoring sensors on excavation face:

1) A methane sensor must be installed 5 meters in front of the local ventilation fan on the excavation face using series ventilation. The alarm concentration should be ≥ 0.5%, the power-off concentration should be ≥ 0.5%, the restoration concentration should be<0.5%, and the power-off range should cover all non essential safety electrical equipment in the excavation roadway.

2) For single lane excavation faces, one methane sensor should be installed within a range of 5 meters from the excavation head and 10-15 meters from the intersection of the excavation working face and the full wind pressure. The gas alarm concentration should be ≥ 0.8%, the power-off concentration should be ≥ 0.8%, the restoration concentration should be<0.8%, and the power-off range should cover all non essential safety electrical equipment in the excavation roadway.

3) The use of double lane excavation connects two excavation working faces within 5 meters of the pit head, and each is equipped with a methane sensor. The alarm concentration is ≥ 0.8%, the power-off concentration is ≥ 0.8%, and the power-off range is for all non essential safety electrical equipment in the excavation roadway when the restoration concentration is less than 0.8%; Install a methane sensor at a distance of 10-15 meters from the connecting roadway in the partitioned return air roadway of the two excavation tunnels. The methane alarm concentration is ≥ 0.8%, the power-off concentration is ≥ 0.8%, the restoration concentration is<0.8%, and the power-off range is all non essential safety electrical equipment inside the two excavation tunnels and the return air roadway;

5】 The air flow in the working face of coal or semi coal rock roadway excavation shall not be less than 0.25m/s, and the maximum shall not exceed 4m/s.

6】 Before starting the local ventilation fan, it is necessary to ensure that the gas concentration in the ventilation area does not exceed 1.0% and the carbon dioxide concentration does not exceed 1.5% before manually starting the local ventilation fan.

7】 Before restoring ventilation, the gas concentration in the airflow within 10 meters of the pressure type local ventilation fan and its switch must not exceed 0.5% before manually turning on the local ventilation fan.

8】 During blasting, the supports and individual hydraulic supports within 10 meters of the excavation face must be reinforced.

9】 The oxygen concentration in the intake airflow of the mining face shall not be less than 20%, and the carbon dioxide concentration shall not exceed 0.5%.

10】 Support: The allowable error for the spacing between anchor rods is ± 100mm, the allowable deviation range for angles is 75 °≤α ≤ 105 °, and the exposed length should not exceed 50mm but not be less than 30mm. The anchor rod tension shall not be less than 5 tons, and the torque shall not be less than 100N M。 The tension of the anchor cable shall not be less than

7、 Blasting

1】 Permanent explosive material warehouse: an explosive material warehouse with a service life of more than 2 years

2】 Nitroglycerin explosive: a mixed explosive composed of nitroglycerin absorbed by combustible and/or oxidizing agents.

3】 Instantaneous detonator: an electric detonator that explodes instantly when powered on.

4】 Delay electric detonators: Explode after a certain period of time after being powered on: Divided into minute second electric detonators and millisecond electric detonators according to different delay intervals.

5】 Minimum resistance line: the shortest distance from the center of gravity of the charge to the free surface.

6】 Positive detonation: The detonation method involves detonating the explosive coil in the direction of the muzzle, with the energy gathering hole facing towards the eye of the cannon, and the bottom of the detonator facing towards the eye of the cannon.

7】 Reverse detonation: The detonation method involves detonating the explosive coil in the direction of the cannon's eye, with the energy gathering hole facing the muzzle, and the bottom of the detonator facing the muzzle.

8】 Bare blasting: a method of blasting by directly applying explosives on the surface of a rock mass or covering it with soil.

9】 Explosion (incomplete explosion): The phenomenon where the detonation wave cannot continue to propagate along the explosive and terminate.

10】 Free surface: the interface between the blasted coal and rock mass and the air. The more free surfaces there are, the better the blasting effect and save materials.

11】 Minimum resistance line: the shortest distance from the center of gravity of the charge to the free surface. When there are two free surfaces in the blasting face, the minimum resistance line in the coal body shall not be less than 0.5m. The minimum resistance line in the rock mass is not less than 0.3m

12】 Blasting: When the gas concentration within a 20 meter radius of the blasting site reaches 1%, drilling, charging, and blasting are strictly prohibited.

13】 Blasting: Blasting is strictly prohibited within 20 meters of the blasting site when there are objects or materials blocking 1/3 of the tunnel.

14】 When the explosion is rejected after power on, the blasting worker must first remove the handle or key, and remove the blasting busbar from the power supply, twist it into a short circuit, and wait for 15 minutes before checking along the line to find the cause of the explosion rejection.