Exploration and Thinking on Roof Management of Small Coal Mines

According to relevant statistics, roof accidents accounted for about 75% of coal mine accidents in Fujian Province. In 2012, a large roof accident occurred in Wuping Coal Mine and Xiaohua Coal Mine in Fujian. The roof accident is a frequent and frequent production safety accident in small coal mines, ranking first among the “six major disasters”. Grasping the roof management of coal mines can effectively promote the sustained, stable and healthy development of coal mine production, especially for small coal mines with relatively complicated geological structures and low technical management level of employees. It is necessary to fully recognize the importance and necessity of roof management work, further enhance awareness, strengthen leadership, and take measures to promote the continuous and effective development of roof management.

1 Strengthen the technical management of the roof to improve the intrinsic safety of the roofway.

1 Strengthen the demonstration of safety production technology for mining face. Under the auspices of the chief miner, the production, safety and geotechnical technicians will be seriously demonstrated. According to the geological factors of the underground site, the degree of mining impact and the surrounding hydrogeological conditions, the feasible roof management methods and support technologies will be determined and the prevention and control will be formulated. Safety technical measures for roof accidents. If the floor tunneling method is adopted, the mining effect can be reduced, or the roadway can be arranged in the whole rock as much as possible, and it should be avoided in the soft and broken rock layer or the complex geological structure belt, and try to avoid the high caused by the mining effect. In the stress zone, the construction conditions are good when the roadway is driven, which is very beneficial to the roof management, and reduces the possibility of roof accidents at the source. For example, try to avoid mutual interference between roadways. Soft rock mines are prohibited from double-drilling. Parallel roadway rock pillars are 40m. In vertical roadway layout, vertical and vertical roadway overlap should be avoided, and vertical rock pillars should be 25m. Choose reasonable support technology to ensure that the support has sufficient support strength to counter the surrounding rock pressure. The deformation of the support should be compatible with the possible deformation of the surrounding rock during the use of the roadway. To promote metal bracket or bolt support.

2 Strengthen the approval of work procedures and study and implementation. And continue to strengthen technical management, focus on solving the weak links, is a key point to do a good job in coal mine roof management. Therefore, in the preparation of the operating procedures, each mining work surface should be based on geological data and similar work surface management experience data, including the top plate to press the law, the preparation of mining work procedures, so that the operating procedures can guide production and ensure safety.

3 Strengthen the standardization of mining engineering quality. Most of the coal mine roof accidents were caused by poor site management and poor quality of the mining face engineering. The quality of mining engineering is the basis of roof management. From the quality of the project, improving the quality of the project is an extremely important measure to prevent coal mine roof accidents. According to the geological conditions of the mine area and the characteristics of the roof, the development of targeted roof management support quality standards, the definition of bare lanes and support lanes, and the scientific management and institutionalization of roof management. Safety inspections are carried out by the safety inspectors on the quality of the support of each mining face, and dynamic management is implemented.

4 Strengthen the roof management of accident-prone locations. In order to prevent the occurrence of roof accidents, it is necessary to do a good job in roof management of accidents. Digging into the large chamber, excavation, fault, fracture zone, stress concentration zone, caving zone, triangle area near Shimen see coal, and through, the first time of the mining face, the first pressure of the old roof, the periodic pressure, the fault, the fracture For special operations such as belts, old air (alley) and finishing, safety measures must be formulated. After the approval of the general manager of the mine, the implementation can be carried out by the production mine manager. The safety supervision department is responsible for supervision, and the management personnel and the team leader are on hand to conduct the operation. , according to the key work surface for security monitoring. Strengthen the working face end and safety exit support, and maintain the advanced 20m support on the working face under the working face. When the pressure top plate is broken, increase the length of the advanced support, and the excavation work face should focus on the use of the front support. The mining work surface insists on knocking on the top system to prevent roof accidents caused by hidden cracks, and it is strictly forbidden to manually return to the column. This is a multi-zone and multi-segment roof accident, which is the key part of roof management and the top priority of roof management.

5 Focus on strengthening the safety management of roadway opening. The opening of the roadway must be formulated according to the actual situation, and the supplementary safety technical measures must be formulated. The approval procedures must be strictly implemented. When opening the underground roadway, it is required to first support the open frame to strengthen the support at the opening, and then erect the lifting shed. The 10m front and rear openings of the roadway must be supported by metal brackets. It is strictly forbidden to work in the open top. Protective materials, no spare materials or insufficient spare materials shall not be opened. According to the law of roof movement of this working face, combined with the actual situation of the site, the opening position of easy roof management is correctly selected to avoid the opening of the mouth or the opening of geological structures such as faults and fracture zones to prevent stress concentration or roof fracture and complicated geological conditions. It is difficult to support and maintain, artificially increasing the difficulty of roof management. Try to control the opening section to an appropriate level and reduce the area of ​​the top gate of the Sanchakou; secondly, adopt scientific techniques and effective measures to strengthen the on-site technical quality management, ensure that the open construction section meets the specified requirements, and the soft soft layer and the medium-thick coal seam. The middle opening should be hand-excavated as much as possible. If other openings need to be opened by blasting, it is necessary to adhere to the method of charging more than the eye, strictly control the opening section, minimize the damage of the surrounding rock and the surrounding coal body, and take measures to prevent the roof from falling. Cross-help, resulting in a large area of ​​the top of the three-port control, it is strictly prohibited to open the magnifying cannon, to take the excavation, chaotic mining and illegal behavior. In the case of only one retreat and safe exit for the open working point, measures such as partitions and baffles shall be taken along the way of retreat, and the height of the partition shall not be less than 2/3 of the thickness of the coal to ensure that the pedestrian and the coal are separated. Strictly prevent eye blocking and blockage; strengthen the regular inspection and maintenance work along the safe passage and safety exits, and find that the deformation of the section or the failure of the support should be repaired in strict accordance with the regulations, and the floating coal and debris on the pedestrian side should be Clean up in time to ensure that the retreat and safe exit are always smooth and reliable. The underground tunnel opening strictly implements the “three-person in place” system for technicians, team leaders and safety officers, goes deep into the scene, performs due diligence, guides ahead, strengthens inspection and supervision, promptly discovers and solves problems, and ensures that safety measures are in place.

2 Strengthen the roof management of the mining site and improve the execution management of the roof.

The working face must be equipped with safety tools for knocking on the top. The mining face must have at least one long and one short crowbar. Before starting work, the team leader must conduct a comprehensive inspection of the safety of the work surface to confirm that there is no danger. Personnel enter the work surface. Excavation work face before and after shooting should be knocked to help the top, timely squatting dangerous dangers such as dangerous stone activities, temporary support measures should be taken when the squat can not be squatted, the umbrella of the face should not exceed the provisions of the operating procedures. The mining face must be timely supported and not empty.

3 Strengthen the inspection and maintenance work of the roadway in use.

It is found that the roof is pressed to cause the failure of the bracket and the deformation of the roadway. It must be repaired in time, reinforce the support, prevent accidents, and ensure that the roadway section meets the needs of pedestrians, ventilation and transportation. Roadway maintenance must establish safety measures, and strengthen the safety monitoring of the on-site operation process, to prevent accidents such as falling down during the maintenance process, causing injuries and blockages in the roof. When the roadway maintenance is to be removed and the roadway support is replaced, it is necessary to strictly stipulate the provisions of Articles 43 and 92 of the Coal Mine Safety Regulations, and must ensure that the personnel can safely retreat when the roof is blocked. When repairing the brackets in the headway, it must be carried out from the outside to the inside. It is strictly forbidden for personnel to enter the maintenance site. When repairing, it is necessary to first strengthen the working place and its adjacent support, strengthen the knocking of the top, timely handle the danger, and implement the advance support. Preventive measures, restore permanent support as soon as possible, and maintain the continuity of construction operations to ensure safe construction operations. 4 Strengthen the construction of the team to promote the “Baiguo Week” team management method, and give full play to the vital role of the team leader in roof management.

The team is the terminal for coal mine production and construction. Relevant coal mine laws, regulations, standards and requirements must be implemented by the team. The construction of the team is the core of the construction of the coal mine staff. The team leader is the organizer and commander of the production line. They are both commanders and combatants. They are most familiar with the conditions of the roof, safety production, and changes in natural conditions. They can take the lead in obeying the rules, encounter various situations, make correct judgments, take corrective measures, and deal with decisively. It is possible to avoid the occurrence of a roof accident. It is necessary to strengthen the construction of the team, actively promote the “Baiguo Zhou” team management law, and carry out the “White Week” class competition, especially to strengthen the safety training and safety education for the team leader. Improve their safety and technical quality, so that they are in the roof management. Play an active role.

5 Give full play to the role of coal mine safety management personnel and timely check the hidden dangers of the roof.

Practice has proved that "hidden dangers" are not arranged, and accidents are inevitable. Coal mine safety management personnel must adhere to the front line, rely on the front command, strengthen the roof management work of the mining work surface, find problems in time, and eliminate hidden dangers. Coal mine safety management personnel must think about the position, do not be numb old and confused; measure responsibility should be implemented, do not float old and do not change; daily management should be strict, do not relax old good people; have to go through their mouths, do not bother to publicize and explain; to follow their own If you can't get enough of your legs, you can run on the scene and step forward; you have to go through your own brains, innovate methods, and improve your skills. We will do our best to cure it, prevent it from happening, and further strengthen the safety supervision of the roof under the roof to prevent roof accidents.

It can be seen that the improvement of technical measures is the basis of roof management. The management of production site is the guarantee for the management of roof. The safety awareness of employees is the key to roof management. These three links are interlocking and chained to be effective. The management of coal mine roofs is carried out to prevent the occurrence of roof accidents.

Shrink Packing Machine

Shrink packing machine applications

Widely used in packaging such as glass bottles, plastic foam, paper boxes, toys, electronics, electrical appliances, stationery, books, music, hardware tools, daily necessities, medicine, cosmetics, beverage, fruit, label items s. The heat wrapped products would be much better good looking and more attractive, and good for displaying. Besides it `s moisture proof, dust free, also it enable prevent pollution, and protect the goods from external shocks, especially for fragile goods. In addition, can reduce product are demolished, and the possibility of theft.

Shrink packing machine features

1. Using roller conveyor, roller outsourcing high temperature silicone tube, can freely rotate each, or you can use Teflon or stainless steel     mesh conveyor belt conveyor.

2. There is uniform temperature inside the furnace, applicable to shrink PE, PVC, POF shrink film and other various materials.

3. The furnace insulation liner to form a hot air circulation, for different packaging materials packaging needs, adjust the speed of the           conveyor belt in order to achieve optimal contraction effect.

4. Have hot air rational allocation, low power capability and ideal even shrink effect.

5. Stainless steel pipe flow conveying (high temperature casing (coat)), to prevent the film sticky, allows the machine more durable.

6. mported motor and available speed control system allows long time continuous packing.

7. Within 0-300 degree range, the temperature adjust freely.

Shrink Packing Machine

Shrink Packing Machine,Shrink Machine,Shrink Wrap Machine,Automatic Shrink Wrapping Machine

ShenZhen Hengxing Machinery Factory , http://www.szchxjx.com