Corresponding preventive measures and treatment methods for mine disasters

(1) Measures to prevent large-scale fall of the roof

1. All mining facets must be strictly in accordance with the operating procedures, and a sufficient number of brackets and pillars should be supported to ensure the mountain is strong. The working face must be backed up in time according to the regulations in the operating procedures. The area and the mining surface are scientifically monitored for dynamic monitoring of the roof support. Control the roof accident.

2. The first time in the mining work surface, the safety measures shall be formulated and reported to the chief engineer for approval. The safety officer should inspect the roof in the working face and immediately organize the personnel to withdraw from the work surface when the situation is critical.

3. When the mining face passes through faults, folds, empty lanes, and partial fracture zones, safety measures must be established or the form of support must be changed, reported to the chief engineer for approval, and workers should be organized to study and implement.

4. When recycling the pillars (racks), the relevant regulations of the operating procedures must be carefully implemented, first and then back. When the pressure is high, the temporary support or the body column should be laid, and the method of remote operation back to the column should be used for retracement.

5. The slope of the mining face reaches 5. For the above working faces, the brackets and pillars must be interlocked (connected with tie rods) and special measures are made.

6, the roadway renovation work must develop special measures, must adhere to the principle of renovation from the outside to the inside.

7. The retracement work of the roadway must formulate special measures and adhere to the principle of withdrawing from the inside and outside.

(2) Measures to prevent floods:

The main floods that may occur in our mine are: (1) fault water (2) summer flood irrigation into the well (3) ash water, etc.

To this end, the following preventive measures are determined:

1. The relevant departments should do a good job in the basic work of mine hydrogeology, observe the water outlet points in the well, and improve the hydrogeological map of the mine. At the same time, it is necessary to extensively collect data to further understand the hydrogeology of the mine.

2. If the excavation work surface and other locations encounter suspicious circumstances as described in Article 266 of the Regulations, they must adhere to the principle of “doubt must be explored, first explore and then excavate”, conduct water exploration and investigation, and identify the situation to confirm safety. Production can be arranged. In the event of a flooding warning, the person in charge of each job site must stop the operation to take measures, and report to the dispatching room and the mine leader, if the situation is critical, must immediately issue an alarm and evacuate all the threatened locations.

3. A certain number of straw bags should be prepared before the rainy season in each wellhead for flood control and water blocking.

(3) Fire prevention

1, strictly fulfill the request 224, "order", are not allowed to be stored underground coal oil, gasoline, transformer oil, or the use of used lubricating oils, cotton, cloth, paper or the like must be placed reclosable iron tub by Special personnel are sent to the ground for regular treatment, and it is forbidden to throw them indiscriminately. It is strictly forbidden to spill leftover oil and waste oil in the wells and the chambers.

2. For all oil storage points in the underground roadway, various mechanical installation points, coal bodies contaminated by oil, all units must be responsible for the regular removal according to relevant regulations, at least twice a month, oiling must use oil absorption It is strictly forbidden to dump all kinds of grease directly into the oil drum.

3, strict electrical equipment management, put an end to open fire operation, eliminate the explosion, all kinds of cables in the underground must not have open mouth, chicken claws, sheep tail, it is strictly prohibited to electrify maintenance and relocation of electrical equipment switches (cables and wires), all kinds of electrical switch settings and The load is consistent and the overload protection is complete.

4. The downhole belt conveyor must comply with the relevant provisions of Article 373 of the Regulations. Flame-retardant belts must be equipped with belt slip protection, smoke protection, temperature protection and coal-protection equipment, as well as dust-proof automatic sprinklers and deviation devices. Non-combustible materials must be supported within 20 meters of the front and rear ends of the belt conveyor belt conveyor.

5. Oxygen welding operations in the underground must be carried out in accordance with the provisions of Regulation 223. If it is necessary to carry out electric welding, gas welding and torch welding in the main diverticulum, main air inlet and wellhead rooms. Every time, safety measures must be formulated. After approval, a designated person must be inspected and supervised on site. After the operation, the site must be cleaned up, no fires must be left, and one hour of guardianship.

6. The underground blasting material library and electromechanical chamber should be equipped with 3 CL4 fire extinguishers; the maintenance chamber and material warehouse should be equipped with 3 CO2 fire extinguishers; the bottom hole yard should be equipped with more than 5 CO2 fire extinguishers; the belt conveyor roadway heads are equipped with 3 CO2 fire extinguisher; 2 CO2 fire extinguishers at the tail; 3 or more CO2 fire extinguishers should be placed at the designated site. All downhole workers must be familiar with the performance of the fire extinguisher and be familiar with the location of these equipment in their work area, and clearly define the responsibility to really play an active role in extinguishing the fire.

7. Set up a ground fire-fighting material library, equipped with sufficient fire-fighting equipment (sand, bucket, fire extinguisher, etc.) to check and test regularly to ensure that it is used in emergency. Fire-fighting materials should not be used because of handling accidents. The materials consumed for handling accidents must be replenished in time. Qi.

8. One mine organizes a fire inspection of the wells from the security inspection, ventilation, fire protection, production, technology and other departments on a quarterly basis, and finds problems in a timely manner.

(4) Measures to prevent spontaneous combustion of coal seams

1. When adopting the backward mining mode, the inflammable materials such as floating coal, pit wood and oil cotton yarn shall not be left in the goaf. After the end of the working face, the equipment shall be removed within 20 days and closed within 10 days.

2, to ensure the quality of ventilation facilities, reduce air leakage in the goaf, often check the ground cracks, find cracks in time to fill, to eliminate the supply of wind to the goaf.

3. Check the closed mining area once a week, check the temperature and gas changes of the abandoned roadway and the return airway and possible heating sites in the semi-monthly, and make a record. Report the problems and treatment results to the ventilation department in time. Leaders, important issues should be reported to the chief engineer in a timely manner, and early measures should be taken to prevent self-ignition.

(5) Preventive measures for gas accidents

1. Strengthen ventilation management, keep the ventilation system reasonable and smooth, ensure reasonable ventilation of the mining face, and supply air according to the air distribution plan. The maximum allowable concentration of harmful gas must comply with the provisions of Article 100 of the Regulations, strictly strengthen the management of CH4, and strictly enforce the “one shot three” "Check" system and "three-person interlocking system."

2. Temporary stoppages must not stop the wind. Otherwise, it must be handled in accordance with the requirements of Article 140 of the Regulations. The ventilation management of the roadway must be strengthened. Special measures must be taken to ensure that all responsible units are strictly implemented according to the measures and fulfill their respective duties.

3. Strengthen the management of blind alleys, the blind alleys in the underground should be closed in time, and the listing management should be carried out according to the requirements. It is strictly forbidden for personnel to enter, and regular personnel should check the harmful gases in the vicinity.

4. To strengthen the gas inspection, the gas inspector must abide by the underground handover system, implement a patrol inspection or a designated person to check the card, complete the report, record and record a correct report, and strictly implement the reporting system, and find the problem in a timely manner, and must The mine dispatching room reported that the ventilation department should immediately report to the mine dispatching room for major ventilation and other problems, and formulate measures to be reported to the chief engineer for approval.

5. The local fan must install a wind power lockout device and be listed on a dedicated person. The local fan used must comply with the requirements of Regulations 127-129.

6. The mining face should be independently ventilated. If it is difficult to arrange independent ventilation, the series airflow (one series connection) can be used to enter the series flow surface. The wind flow center surface is equipped with CH4 automatic detection alarm power-off device, and must comply with the "Procedure" 114 Provisions.

7. The ventilation department checks the anti-wind facilities at least once a quarter, and the whole mine conducts a reversal drill every year.

8. The gunners, team leaders, mine leaders, etc., team, team cadres, and technicians should wear portable biogas detectors when entering the wells, and electric lockers and other workers who enter the mining area to disperse the flow operations wear alarm miner's lamps.

9. All electrical equipment must meet the requirements of explosion-proof. The electrical equipment of the downhole should be inspected and accepted by a special person. All mechanical and electrical equipment must be managed by a special person, and problems should be solved in time.

10. Strengthen the management of open fire, strictly enforce the body-checking system, and strictly prohibit the wearing of chemical fiber work clothes into the well. It is strictly forbidden to bring all kinds of fire into the well. The underground oxygen welding operation shall be examined and approved according to the provisions of Article 223 of the Regulations, and corresponding measures shall be put forward and strictly implemented.

11. Strengthen the management of shotguns, strictly implement the "one shot three inspections" and the third section of Chapter 7 of the "Procedures" on the relevant regulations for underground shooting, and the water cannons and artillery must be used to seal the blastholes.

12. Strengthen the management of miner's lamp. The miner's lamp issued must meet the requirements. It is forbidden to dismantle, knock and hit the miner's lamp underground. Any miner's lamp that is damaged or detonated shall not be used in the well. It is strictly forbidden to use the miner's lamp to shoot.

13, underground power supply to do "three no" (no chicken claws, sheep tail, Ming joints) "four have" (with over current and leakage protection, screws and spring pads, seals and baffles, grounding devices), " Two"" (the cable is hung neatly, the equipment room is clean and tidy), "three full" (protective device, insulation tools, drawings and data) "one insist" (persistent use of relays).

B. Measures to prevent coal dust:

1, dust prevention measures

(1) The coal body water injection should be carried out before and during the mining of the mining face. The excavation face is implemented with wet eye-catching, using water-bubble mud, dripping water after blasting, etc., and dusting is also required during the shipping process. When the mining machinery is running, it must enter the spray watering.

(2) The main roadways, diverticulums, and belts in the underground should be cleaned regularly, and the main transportation lanes, return air lanes, up and down mountains, roadways, and coal mining planes should be installed in the dust-proof pipeline. The branch pipe and valve are installed at 50 meters to flush the roadway and dustproof, and the airflow purification water curtain is set in the return airway of the working face.

(3) The downhole coal eyes should not be emptied, the underground coal bunker, the coal slippery eyes, all kinds of transport machines and each transfer point must be equipped with a spray dust-removing device, and ensure normal use.

(4) Strictly control the wind speed to prevent coal dust from flying. In addition to the coal can not be emptied, the ram should be closed and the wind speed of the belt lane should be strictly controlled. It is in compliance with the provisions of Article 101 of the Regulations, and the wind speed of other roadways must also be enforced. Provisions.

(5) The mine car is guaranteed to be in good condition to prevent coal leakage. The coal mining dust should be cleaned frequently in each driving face transported by one ton bottom unloading truck, and the roadway sprinkler water dusting work should be carried out once a week.

(6) Before and after the shooting and excavation work surface, the guns must be sprayed in accordance with the regulations. The excavation work surface should also gradually implement the gun spray method to eliminate dust.

2. Prevent spontaneous combustion of coal dust:

(1) Underground electrical equipment and facilities must be explosion-proof, cables should be hung neatly, and there must be no breaks; live cables must not be used in coils (except electromechanical and electric drill cables). Chicken claws, sheep tails, etc. should not appear, and open flames should be eliminated to prevent external causes. Fire.

(2) Strictly comply with the requirements of Chapter 7 of the Regulations, strengthen the management of pyrotechnics, and strictly prohibit littering. The abandoned cartons, wrapping papers and plastic bags of fireworks storage points should be managed centrally, and the wells should be cleaned regularly. Strictly carry out the blasting operation according to the regulations of the operation regulations. Before the charging, the pulverized coal in the eyes should be exhausted. The filling of the medicines should be continuous and tight, and must be sealed with water cannon and artillery to prevent coal burning and residual explosion. The phenomenon of shooting a gun occurred. To ban the cannons and cannons.

(3) Explosion-proof measures:

In the mining area adjacent to the two wings of the mine, adjacent coal seams and adjacent working faces must be separated by water sheds. The water sheds are strictly arranged in accordance with the relevant provisions of the Code for Prevention and Control of Coal Mine Dust.

The domestic current situation of the die-casting mould

Die Casting Mould industry has developed rapidly in our country, the total output growth significantly, domestic die casting mold production after the United States, has become the second in the world, become the veritable die-casting superpower. It can have such achievement because of our country with unique broad market advantages and relatively cheap labor force. Depend on very obvious price in the international trade market, we produced the die casting mould which occupies a bigger superiority, according to the situation, in the future Chinese die casting industry development prospects are very broad.

The designing of die casting tooling
1, According to the materials, shape and precision product, analyze technology, decide of the process.
2, Confirm the location of product in the mold cavity. Analyze parting surface, overflow system and the gating system.
3, Design the various activities of the core are assembled and fixed method.
4, Design the core-pulling distance and force.
5, Design the ejection device.
6, Confirm the die casting machine, design the mould base and the cooling system.
7, Checking the mould size and die casting machine, drawing the process flowchart and component of die casting mold.
8, Design is complete.

Die-casting mould making flowchart

Aluminum injection mould material and materials and its properties

Material of aluminum die casting mould: H13, ASSAB DIEVAR, SKD6;

Mould base: #45 steel, standard mould base (LKM);

Hardness after treatment: RHC 48~52;

Standard Configuration: Cooling system;

Tolerance: 0.1mm;

Machining equipment: CNC gantry milling machine, middle-speed WEDM machine, slow-feeding EDM, die spotting machine;

Mould life: 50000 shots ~ 100000 shots;

Lead time of die casting mould: 40 days-60 days.

What is the Moldflow analysis, this conception derived fromtaiwan. it's a precess through the computer for injection molding simulation by data simulate software, and get data result. Then assess the feasibilty of the mold program through these results to perfect mold and production designation.The common software for plastic mold such as moldflow, moldex 3D and so on. And the common software for Aluminum Die Casting Parts such as PROCAST, FLOW 3D and so on.

The conventional materials of die casting core, insert, slider

Production of die casting mould and QC control

Die Casting Mould

Aluminum Die Casting Mould, Zinc Die Casting Mould, Die Casting Mould, Die Cast Mold

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