I. General situation of working face
3709 working face adopts strike longwall mining method and general mining technology, and the shearer breaks coal and loads coal, and the mining height is 2.3 meters. The length of the cut is 90 meters, and π-shaped steel beam single hydraulic prop is used for support.
3603 working face, the length of gateway is about 300 meters, and the cutting length is 95 meters.
Second, organization.
1, set up a safety management leading group.
Team leader: Du Jilin
Deputy leader: Shen Junnian
Members: Guan Xinjun,,, He, Guan Haijun, Su Jianzhong, Zhao Yungang, Chen.
2, the leading group work system
(1) After the working face enters the face withdrawal stage, the members of the leading group will give on-site guidance.
(2) members of the leading group should attend the briefing on time, contact the working face by telephone, learn more about the situation of a shift on the working face, and make arrangements for the shift.
(3) The safety team organizes a meeting every day to communicate the work of the day and put forward rectification plans for major hidden dangers. In case of special circumstances, the technical department and the operation department will coordinate to solve them.
Third, the division of responsibilities
The team leader is fully responsible for the organization and coordination of the work and the overall process arrangement.
Shen Junnian, deputy head, is fully responsible for the layout, arrangement and supervision of on-site work.
Members are responsible for on-site duty guidance to ensure on-site safety and accident-free.
Fourth, material preparation
Spare pit wood is not less than 5 square meters.
Not less than 2 sets of supporting tools.
Verb (abbreviation of verb) Steps and specific measures for removing face: (The specific measures for removing shearer are attached)
Nailing the 3709 track into the back lane-improving the support of the working face-dismantling the tail of the scraper conveyor-dismantling the shearer-dismantling all the scraper conveyors-dismantling the belt and coal chute conveyor (facilities such as air pressure and dust prevention in two lanes)-dismantling all the supporting materials of the working face-sealing. (Substation, drainage pump station, pipeline, pipeline of hydraulic pump station, cable switch, etc.). Can be taken out parallel to the taking-out surface. )
When the working face advances to the stop mining line, the support form is changed from staggered beam support to neat beam support, the roof control distance of the working face is minimized, and the safety exit is cleaned to make it smooth. First, push the coal winning machine to the designated position, and make all preparations before withdrawing the machine (in the section where the coal winning machine is located in the cutting hole, a machine nest with a length of10 ~15m, a height of 2.5m and a width of1.5m will be excavated by blasting along the coal wall), and all the remaining unused equipment in the working face will be recovered, and the quantity will be counted by the quality inspector and stored in the designated place. After hauling the shearer and conveyor, the support will be withdrawn from the tail of the working face to the nose. Every time a support is withdrawn from the working face, two wooden pillars are placed at the withdrawal support, and one is placed in every four supports in the withdrawal support space to maintain the withdrawal space and ensure ventilation. After all the equipment in the working face is withdrawn, the wooden crib will reinforce the two gateway, and the gateway sealing must be completed by the ventilation team within 45 days to prepare for the timely adjustment of the ventilation system.
Specific measures:
1, the cut of the working face was pushed to the stop mining line, and the roof of the goaf did not completely collapse, but some of the roof hung, so blasting forced caving must be taken.
2, insist on checking the roof along the retreat at least once an hour, to ensure the safety and smoothness of the retreat route, and handle the problems in time when found.
3, retreat stage, near the side of the gangue hill to add temporary kung shed column reinforcement, leg pedal in front of the leg. More pillars should be placed on the side of the coal side, at least one meter long.
4, in the process of working face retreat, strictly control the support quality of the exit of two lanes and the dynamic monitoring of the roof to ensure the connection between the steel beam and the roof. On the basis of the original support, advance support can increase double-row support or temporary reinforcement support to ensure the support quality.
5, roadway pedestrian side shall not be less than 70 cm, without sundry, to ensure smooth pedestrian exit.
6, working face artificial retreat, it is forbidden to gas overrun. In order to ensure that the airflow is not blocked, the materials piled up in the roadway of the working face shall not exceed 1/3 of the cross-sectional area when retreating.
7. In order to facilitate the withdrawal of the shearer, a gap with a length of 15m and a width of 1.5m is left at the tail of the conveyor in the working face, and the track is laid to provide working space for the disassembly and assembly of the shearer.
8. Dismantling sequence of shearer: firstly dismantle the cable traction device, spray dust removal and water cooling system of shearer, and then withdraw the right drum, right rocker arm, central control box, left rocker arm and left drum from right to left.
9. Withdrawal sequence of conveyor: firstly, remove cables, cable troughs (coal retaining plates), crawling guide rail and frame of shearer, then remove all scraper chains and head transmission devices of conveyor, then remove tail frame, rear transition groove and all intermediate grooves, and remove front transition groove, head frame and base.
10, the roadway equipment for transportation and return air in the working face can work in parallel with the shearer and conveyor in the working face at the same time. The withdrawal of roadway equipment in mining face is generally removed from outside to inside in turn.
1 1. The supporting equipment of the working face was recovered, and the original rigid support was changed into wooden support. Use wooden stakes 1 for every four steel beams removed. Both ends of the working face should also be piled up to ensure the smooth wind path when retreating.
Installation steps and specific measures of intransitive verbs: (substation, drainage pump station, pipeline, hydraulic pump station pipeline, cable switch, etc. Can be mounted parallel to the take-out surface)
3603 track air inlet tunnel nail-working face support-scraper conveyor installation-shearer installation-end support-advanced support-belt conveyor installation-trial operation for mining.
22Kg/m track is adopted in the return air lane and open-cut working face of track 3603, and the fittings are fully fastened, and the sleeper spacing is not more than1m.. The working face adopts DW-25/ 100 single hydraulic prop and DFB-2600π steel beam supporting shed, with vertical column arrangement, and the spacing between each pair of steel beams is 1 m.. At the lower end of the working face, the initial nest length of the track return air lane is 15-20m, the height is not less than 2.5m, and the depth is not less than1.5m.
Specific measures:
1, replace the original wooden supports of the open-off cut in the working face one by one. When replacing, operate from the end of the transportation gateway to the end of the rail return air lane in turn, to ensure that one support is replaced by another, and to meet the requirements of the working face support, to ensure that the top and side are firmly inserted, and the working face is safe and reliable.
2. When there are no special circumstances, such as supporting workers lifting columns, loading beams, digging column nests, etc., they should operate in an absolutely safe place.
3, before supporting, must be under the protection of stents in good condition, strictly implement the system of knock help ask top, remove hanging gangue dangerous rock and loose coal help, confirmed by the security officer, monitor of the class without danger rear can work.
4, it is forbidden to use the failure and damage of the pillar and top beam.
5, the top beam and the roof should contact neatly, if the roof is uneven or local roof caving, must use wood roof back.
6. When lifting the beam support for the first time, there shall be no less than 4 people in each group, with 2 people lifting the steel beam, 1 person supporting the column, 1 person observing, and lifting the column with a hydraulic gun.
7. The installation of scraper conveyor should meet the requirements of "three levelness, three straightness, one stability, two completeness, one leakage and two none".
8, coal winning machine installation, site conditions and tools must be ready, not ready not to install, parts should be complete, unqualified not to install, bruised junction, not maintenance not to install.
9. When installing pins and shafts, clean them and coat them with oil. When they are misaligned, it is forbidden to beat them with tools to prevent them from breaking parts.
10. When assembling splines, clean the splines first; Secondly, align them with the grooves; Third, tighten them smoothly.
1 1. Protect electrical components, operating handles and buttons from damage. Clean the joint surface, and if there is no problem, then place the roller.
12. When lifting, obey the unified command of the person in charge now. If the roof and shed beams are not firm, they cannot be hoisted. When lifting, it should be hoisted directly, and it is not allowed to pull the shed beam obliquely to avoid personal injury and equipment injury.
13. After installation, it is necessary to check before debugging. When debugging, the sundries at the drum must be removed, and debugging should be carried out after there is no problem, in strict accordance with the debugging requirements and standards.
Requirements for installation quality of shearer:
Parts are intact, bolts are complete and fastened, handles and buttons are flexible and in correct positions, connecting bolts between motor and traction and cutting parts are firm, drum screws (bolts) are complete, fastening tests are qualified, and the work is reliable and safe.
The underground installation of shearer is mostly carried out at the end of the working face, and the support should be erected at the installation site of the end of the working face and reinforced with the top beam to protect the working space and bear the weight of the crane body. On the conveyor near the installation site, enough time should be left for the shearer to be placed on the conveyor.
After the main body of shearer is installed, auxiliary devices such as traction device and cable are installed on the fuselage. In accordance with the provisions, connect the water source to the coal winning machine, and fill the ministries with lubricating oil. Conduct mechanical and electrical component action tests as required.
After the installation and commissioning of the shearer, trial production should be carried out to observe the load operation of the shearer so as to deal with the problems in time. Before the machine is put into operation, the oil in the machine should be drained, and various filter elements should be cleaned or replaced. Finally, new oil should be injected as required to ensure the reliable operation of the machine and prolong its service life.
Eight, matters needing attention
1. Count before and after class.
2. Check the gas regularly during moving (coordinate with the gas group according to the site conditions and urge the gas staff to implement it on site).
3. In the stage of roof closing, the height of off-cut shall be controlled in strict accordance with the operation procedures to prevent large-scale roof caving from crushing the pillar.
4. The quality inspector should intensify the inspection to ensure that the recovery rate of supporting materials reaches 100%.
5, in the process of retreat, team leader must strictly implement the system of on-site classes, it is forbidden to special operations personnel to enter.
6. In order to ensure that the hydraulic pressure provided by the emulsion pump station is not lower than 18MPa, the quality inspector shall check the column pressure at any time. In case of emergency, he has the right to evacuate all personnel first and then report to his superiors.
7, before moving, should according to the direction of the working face and the installation order of the machine in the well to arrange the loading order and orientation of the parts, so as to avoid unnecessary U-turn in the underground.
8. Before installation, the person in charge of the electromechanical team must ensure the quality of equipment maintenance and installation.
I believe that after the above introduction, everyone has a certain understanding of the safety technical supplementary measures for the withdrawal and installation of general coal mining faces. Welcome to Zhong Da for more information.
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