Rotary mining method for fully mechanized coal mining face

Abstract

The invention discloses a rotary mining method for a fully mechanized coal mining face, which comprises the following steps: in a rotary stoping process, a coal mining machine cleanly sweep float coal on the side of a coal wall after coal is cut at a machine head, a working face vehicle propping mode adopts one-way vehicle propping operation from the machine head to a machine tail, a working face chain plate machine is controlled to move towards the machine head, and after the machine head props against the vehicle every time, the machine head is driven to rotate; selecting proper positions at a transition groove of a machine head and a coal shoveling plate of a conveyor to hit a single body, and controlling the conveyor to move towards the machine head during car propping. In the rotary stoping process, the coal mining machine cleans float coal on the side of the coal wall after coal is cut on the machine head, so that car abutting is facilitated, the working face car abutting mode adopts one-way car abutting operation from the machine head to the machine tail, the working face chain plate machine can be controlled to move towards the machine head, the machine head goods outlet space is guaranteed, and meanwhile, the coal mining efficiency is improved. And the wall brushing workload at the tail of the working face is also reduced by controlling the moving amount of the scraper conveyor.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal mining, and more specifically to a rotary mining method for a fully mechanized mining working face. Background Art

[0002] The 1315(1) working face of Zhangji Mine is located in the East 2 11-2 mining area. Affected by the Fs203 (H=10-40m) fault, the working face transport chute is arranged at a turn at 800m with a turning angle of 39°. The designed mining length of the transport chute is 1360m and the designed mining length of the track chute is 1520m. In order to efficiently mine the coal resources outside the working face and in the turning area to maximize the resource recovery rate and benefits and reduce the inverted installation of the working face, it is necessary to solve the problems of the transport chute coal discharge system transformation, the displacement of the working face scraper conveyor and the adjustment of the support frame. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to prevent the working surface scraper conveyor from shifting.

[0004] The present invention solves the above technical problems by the following technical means: when the working face transport chute is mined to 660m from the withdrawal point, the inner belt conveyor is removed and the transfer machine is pulled beyond the turning point, a scraper conveyor is laid to overlap with the tail of the transfer machine, and the chute of the chute chain plate machine is removed with the working face mining, and the overlapping position of the tail of the chute scraper conveyor and the head of the working face chain plate machine is adjusted;

[0005] When the working face continues to advance to the withdrawal point of 780m, the transfer machine is pulled outward by 10m, and the chute scraper conveyor adds multiple sections of chute to overlap with the transfer machine for delivery. The chute chain conveyor chute is removed with the working face mining, and the overlap position of the chute scraper conveyor tail and the working face chain conveyor head is adjusted;

[0006] When the working face is mined to 785m from the withdrawal point of the transport chute, rotary mining begins according to the position relationship between the inner and outer sections of the working face. The rotary mining angle of the working face is 39°, and the rotary mining ratio is set to 1:7. During the rotary mining, the support frame type and the conveyor angle are adjusted;

[0007] During the rotary mining process, the coal mining machine sweeps away the floating coal on the side of the coal wall after cutting the coal at the machine head. The working face car-impacting method adopts a one-way car-impacting operation from the machine head to the machine tail, and controls the working face chain plate machine to move toward the machine head. After each machine head impinges on the car, a single unit is set at a suitable position at the machine head transition trough and the conveyor coal shovel plate to control the conveyor to move toward the machine head when impinging on the car.

[0008] As an optimal technical solution, before the start of the rotary mining, the direction of the working face support is adjusted so that the head of the support is kept facing the tail of the machine and the tail of the support is facing the head of the machine, with the front right column of the support leading the left column by half a column; the direction of the support is dynamically adjusted during the mining process, and the hydraulic support is gradually adjusted as the mining direction of the working face changes.

[0009] As an optimal technical solution, when the working face is mined to 800m away from the retreat point, the scraper conveyor in the transport chute is removed, the transfer machine is pulled back and connected with the scraper conveyor of the working face, and rotational mining is continued in proportion through the virtual rotation center until the rotational mining is completed.

[0010] As a preferred technical solution, during the rotary mining process, a single body is used to assist in adjusting the support, and to adjust the support gap and frame shape.

[0011] As a preferred technical solution, the tail section of the machine is pre-brush-supported during the rotary mining process.

[0012] As a preferred technical solution, during the rotary mining process, each circulating coal machine on the working face runs an empty cut each time, aligns the conveyor and adjusts the support.

[0013] As an optimal technical solution, the rotary mining ratio is dynamically adjusted according to the support frame type during the rotary mining of the working face, including using a small ratio of 1:7 for rotary mining at the beginning, and a large ratio of 1:8 or 1:9 after the support frame type and the scraper conveyor model are stably controlled.

[0014] As a preferred technical solution, when the working surface support has a tendency to bite or tilt, the rotation ratio is reduced, such as 2:7, 3:5, or 1:4.

[0015] The beneficial effects of the present invention are:

[0016] (1) In the present invention, during the rotary mining process, the coal mining machine sweeps away the floating coal on the side of the coal wall after the machine head cuts the coal, which is convenient for the car-pushing operation. The working face car-pushing method adopts a one-way car-pushing operation from the machine head to the machine tail, and the working face chain plate machine can be controlled to move toward the machine head. During the rotary mining process, after each machine head pushes the car, a single unit is selected at a suitable position at the machine head transition groove and the conveyor coal shoveling plate to be set, and the conveyor can be controlled to move toward the machine head when the car is pushed, thereby ensuring the shipping space of the machine head. At the same time, by controlling the movement amount of the scraper conveyor, the brushing workload at the tail of the working face is also reduced.

[0017] (2) In the present invention, during the rotary mining process, the tail section of the machine is brushed and supported in advance to ensure the safety of the roof at the tail of the working face and the normal coal cutting process; during the rotary mining of the working face, the rotary mining ratio is dynamically adjusted according to the support frame type, and a small ratio of rotary mining is carried out at the beginning of the rotary mining. After the support frame type and the scraper conveyor type are stably controlled, a large ratio of 1:8 or 1:9 is adopted for rotary mining; when the working face support has a tendency to bite or tilt, the rotary mining ratio is reduced; this ensures that the working face support frame type is stable and the frame direction is correct, and the scraper conveyor can deliver goods smoothly.

[0018] (3) In the present invention, in order to maintain the support direction and frame shape during the rotary mining process, a single auxiliary support is used to dynamically adjust the support gap and frame shape to avoid frame squeezing.

[0019] (4) In the present invention, rotary mining is adopted, and the rotation angle of the working face is 39°, with a ratio of 1 to 7, which reduces the total number of tunnel excavation workers and the number of times the comprehensive mining working face is moved, ensures normal production succession, alleviates the tense situation of mine succession, reduces the amount of tunnel excavation required for working face inversion, and saves tunnel support costs, labor costs and installation and dismantling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the 1315 (1) working face before the first transformation provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of the 1315 (1) working surface after the first transformation provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of the 1315 (1) working surface before the second transformation provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of the 1315 (1) working surface after the second transformation provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of the 1315 (1) working face during rotary mining provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of the 1315 (1) working face after the third transformation provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram showing the comparison of the displacement of the scraper conveyor of the 1315 (1) working face provided in an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the rotary mining angle of the 1315 (1) working face provided in an embodiment of the present invention;

[0028] Figure numbers: 1. Belt conveyor; 2. Working surface chain conveyor; 3. Hydraulic support; 4. Transfer machine; 5. Yunshun; 6. Chute chain conveyor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 , fully mechanized face rotary mining method, including

[0031] S1. Rotary mining parameter design:

[0032] The rotation angle of the working face is 39°. The more the rotary mining cycles, the more serious the shifting phenomenon of the working face conveyor and hydraulic support. Taking into account the length and geological conditions of the working face, the rotary mining ratio of 1:7 is selected, with 1 cut in the machine tunnel and 7 cuts in the air tunnel, that is, 1 cut in the head of the machine and 7 cuts in the tail of the machine.

[0033] For each rotation cycle, the machine head advances 0.8m and the machine tail advances 5.6m; for each cycle, the chain conveyor on the working face rotates at an angle of 1.132°. When the 18th cycle is completed, the conveyor reaches the turning point of Yunshun 5. At this time, the angle between the conveyor and the vertical line of the inner section roadway is 20.376°, and the conveyor is expected to move 2.67m cumulatively toward the machine head.

[0034] The outer section of the working face continued to be mined in rotation. As the mining continued, the angle between the conveyor and the vertical line of the outer section of the roadway gradually decreased. When the mining reached the 34th cycle, the conveyor was basically consistent with the vertical line of the outer section of the roadway. The conveyor moved 2.24m to the tail direction, the conveyor was retreated 813m, and the head of the conveyor was expected to exceed the center line of the roadway by 370mm; the tail of the conveyor was expected to be 3620mm away from the center line of the roadway, the track was retreated 971.4m, and the mining was completed.

[0035] Due to the rotary mining operation, the conveyor as a whole moves toward the nose of the machine, resulting in the coal machine at the tail of the machine not being able to cut through (the maximum remaining coal pile is 4.01m wide), so it is necessary to brush the side in advance; the brushing length is 841 to 955m;

[0036] S2. Modification of coal discharge system before and during rotary mining:

[0037] S21, the first transformation of coal discharging system:

[0038] See also Figure 1 , Figure 2 , when the working face transport chute is mined to 140m from the turning point, i.e. 660m from the withdrawal point, the inner belt conveyor 1 is removed and the transfer machine 4 is pulled beyond the turning point, and then a SGZ-1000 / 1400 scraper conveyor is laid to overlap with the tail of the transfer machine 4. The head of the SGZ-1000 / 1400 scraper conveyor is driven by a single motor, and the tail is transformed into a simple tail. As the working face continues to be mined, the chute of the chute chain conveyor 6 is dynamically removed every day, and the overlapping position of the tail of the chute scraper conveyor and the head of the working face chain conveyor is adjusted to ensure smooth coal discharge;

[0039] S22, the second transformation of coal discharging system:

[0040] See also Figure 3 , Figure 4 As the working face continued to advance to the retreat point of 780m, the second transformation of the Yunshun 5 coal discharge system was carried out. The transfer machine 4 was pulled outward by 10m, and 4 chutes were added to the chute scraper conveyor to overlap with the transfer machine 4 for delivery. The chute of the chute chain conveyor 6 was dynamically dismantled daily, and the overlap position of the tail of the chute scraper conveyor and the head of the chain conveyor of the working face was adjusted to ensure smooth coal discharge;

[0041] When the working face is mined to 15m from the turning point of the transport chute, i.e., the withdrawal point of 785m, rotary mining is started according to the position relationship between the inner and outer sections of the 1315 (1) working face. During rotary mining, the support frame type and the angle of the conveyor are dynamically adjusted.

[0042] S23, the third transformation of coal discharging system:

[0043] See also Figure 6 When the working face is mined to 800m from the turning point, i.e. the withdrawal point, the scraper conveyor 6 in the transport chute is removed, and then the transfer machine 4 is pulled back and overlapped with the SGZ-1000 / 1710 scraper conveyor 6 on the working face, and the rotary mining is continued in proportion through the virtual rotation center (not shown) until the rotary mining is completed;

[0044] S3, the rotary mining conveyor and support frame control includes the following steps:

[0045] S31. Before the start of rotary mining, adjust the direction of the support frame on the working face so that the head of the support frame is kept facing the tail of the machine and the tail of the support frame faces the head of the machine, with the right column in front of the support frame half a column ahead of the left column; dynamically adjust the frame direction during the mining process, and gradually adjust the hydraulic support as the mining direction of the working face changes;

[0046] S32. During the rotary mining process, the coal mining machine sweeps away the floating coal on the side of the coal wall after cutting the coal at the machine head, which is convenient for the car-pushing operation. The car-pushing method of the working face adopts a one-way car-pushing operation from the machine head to the machine tail, and controls the chain plate machine of the working face to move toward the machine head;

[0047] S33, during the rotary mining process, after each time the machine head reaches the vehicle, a single unit is set at a suitable position at the machine head transition trough and the conveyor coal shovel board to control the conveyor to move toward the machine head when the vehicle reaches the vehicle;

[0048] S34. During the rotary mining process, in order to maintain the support direction and frame shape, use a single auxiliary support adjustment to dynamically adjust the support gap and frame shape to avoid frame squeezing;

[0049] S4. During the rotary mining process, the tail section of the machine should be brushed and supported in advance to ensure the safety of the roof at the tail of the working face and the normal coal cutting process;

[0050] S5. During the rotary mining process, each circulating coal machine on the working face should align the conveyor and adjust the support every time it runs an empty cut.

[0051] During the rotary mining of the working face, the rotary mining ratio was dynamically adjusted according to the support frame type. At the beginning of the rotary mining, a small ratio was carried out. After the support frame type and the scraper conveyor 6 model were stably controlled, a large ratio of 1:8 or 1:9 was adopted. When the working face support showed a tendency to bite or tilt, the rotary mining ratio was reduced. For example, the ratio was 2:7 on November 11, 3:5 on November 18, and 1:4 on December 4. The dynamic adjustment of the working face rotary mining ratio ensured the stability of the working face support frame, the correct direction of the frame, and smooth delivery of the scraper conveyor 6.

[0052] See also Figure 7 By comparing the predicted shifting amount of scraper conveyor 6 with the actual shifting amount during mining, it can be seen that a series of measures have been taken to effectively control the shifting of scraper conveyor 6 on the working face, ensuring the shipping space at the head of the machine; at the same time, by controlling the shifting amount of scraper conveyor 6, the workload of brushing the sidewalls at the tail of the working face is also reduced; the working face actually starts brushing the sidewalls from 840m to 940m, with a maximum brushing depth of 3m; the risk of long-distance and large-section support at the tail of the machine is avoided.

[0053] The 1315(1) working face successfully rotated 39°, creating the largest rotation recovery angle for fully mechanized working faces in the Huainan mining area, recovering about 200,000 tons of coal resources from the 11-2 working face, freeing up 300,000 tons of coal resources from the 13-1 working face, reducing the cost of tunneling and support by RMB 6 million, saving RMB 22 million in installation and demolition costs, and creating a cumulative economic benefit of RMB 408 million. The safety and quality standardization level of the working face was stable, with significant safety effects, ensuring the stability of mine production succession, and providing valuable experience and technical reserves for the mining of working faces with similar conditions.

[0054] If rotary mining is not adopted, it will be necessary to skip mining and dig a new cut hole. Therefore, the total number of tunnel excavation workers and the number of times the comprehensive mining face is moved are reduced, ensuring normal production succession, alleviating the tense situation of mine succession, and reducing the amount of tunnel excavation required for face inversion. The 1315(1) working face excavated one less cut hole tunnel of 240m, saving 3 million yuan in tunnel support and labor costs; the overlying 13-1 coal continued to use the rotary mining technology, which also saved one less cut hole of 240m, saving 3 million yuan in tunnel support and labor costs; at the same time, it saved nearly three months of human resources for an excavation team and saved installation and demolition costs. The smooth rotary mining of the 1315(1) working face reduced the installation and demolition caused by the relocation of the working face by one time, saving 9 million yuan; the overlying 13-1 coal continued to use the rotary mining technology, which also reduced the installation and demolition by one time, saving 13 million yuan.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary mining method for a fully mechanized mining face, characterized in that: When the working face transport chute is mined to 660m from the withdrawal point, the inner belt conveyor 1 is removed and the transfer machine is pulled beyond the turning point. The scraper conveyor is laid to overlap with the tail of the transfer machine and the chute of the chute chain conveyor 6 is removed as the working face is mined. The overlap position of the tail of the chute scraper conveyor and the head of the working face chain conveyor is adjusted. When the working face continues to advance to the withdrawal point of 780m, the transfer machine is pulled outward by 10m, and the chute scraper conveyor adds multiple sections of chutes to overlap with the transfer machine for delivery. The chute of the chute chain conveyor 6 is removed as the working face is mined, and the overlap position of the tail of the chute scraper conveyor and the head of the working face chain conveyor is adjusted; When the working face is mined to 785m from the withdrawal point of the transport chute, rotary mining begins according to the position relationship between the inner and outer sections of the working face. The rotary mining angle of the working face is 39°, and the rotary mining ratio is set to 1:

7. During the rotary mining, the support frame type and the conveyor angle are adjusted; During the rotary mining process, the coal mining machine sweeps away the floating coal on the side of the coal wall after cutting the coal at the machine head. The working face car-impacting method adopts a one-way car-impacting operation from the machine head to the machine tail, and controls the working face chain plate machine to move toward the machine head. After each machine head impinges on the car, a single unit is set at a suitable position at the machine head transition trough and the conveyor coal shovel plate to control the conveyor to move toward the machine head when impinging on the car.

2. The rotary mining method of fully mechanized mining face according to claim 1, characterized in that: Before starting rotary mining, adjust the direction of the working face support so that the head of the support is kept facing the tail of the machine, and the tail of the support is facing the head of the machine, with the right column in front of the support leading the left column by half a column; during the mining process, dynamically adjust the direction of the frame, and gradually adjust the hydraulic support as the mining direction of the working face changes.

3. The rotary mining method of fully mechanized mining face according to claim 1, characterized in that: When the working face is mined to 800m from the retreat point, remove the scraper conveyor 6 in the transport chute, pull the transfer machine back and connect it with the scraper conveyor 6 of the working face, and continue to carry out rotational mining in proportion through the virtual rotation center until the rotational mining is completed.

4. The rotary mining method of fully mechanized mining face according to claim 1, characterized in that: During the rotary mining process, a single body is used to assist in adjusting the support, and the support gap and the frame shape are adjusted.

5. The rotary mining method for fully mechanized mining face according to claim 1, characterized in that: During the rotary mining process, the tail section of the machine is pre-supported by brushing.

6. The rotary mining method of fully mechanized mining face according to claim 1, characterized in that: During the rotary mining process, each circulating coal machine on the working face runs an empty cut each time, aligns the conveyor and adjusts the support.

7. The rotary mining method for fully mechanized mining face according to claim 1, characterized in that: During the rotary mining of the working face, the rotary mining ratio was dynamically adjusted according to the support frame type, including a small rotary mining ratio of 1:7 at the beginning of rotary mining, and a large rotary mining ratio of 1:8 or 1:9 after the support frame type and the scraper conveyor 6 type are stably controlled.

8. The fully mechanized mining face rotary mining method according to claim 7, characterized in that: When the working face support tends to bite or tilt, reduce the rotation ratio, such as 2:7, 3:5, or 1:4.

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