Method for parallel operation of coal mining and filling

Abstract

The present invention provides a system for parallel operation of coal mining and filling, comprising: coal production equipment, the coal production equipment being suitable for being arranged behind the coal seam to be mined, with coal transportation lanes and material transportation lanes being arranged on both sides of the coal seam to be mined, both of which extend from front to back to the area where the coal production equipment is located; retractable support and separation equipment, the retractable support and separation equipment being suitable for being arranged behind the coal production equipment and being spaced apart from the coal production equipment; and filling equipment, the filling equipment being suitable for being arranged behind the retractable support and separation equipment, the filling equipment being used to fill the goaf behind the retractable support and separation equipment, and a filler transportation lane for transporting filler being arranged on at least one side of the goaf. The system for parallel operation of coal mining and filling provided by the present invention enables parallel operation of coal mining and filling, greatly improving coal mining efficiency while achieving green mining.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to a method for parallel operation of coal mining and filling. Background Art

[0002] After coal mining, goafs are formed. Currently, the widely used longwall full-collapse mining process is a method in which the roof of the goaf collapses spontaneously after the coal is mined, filling the goaf. Longwall full-collapse mining faces safety and environmental challenges: First, as the coal seam is mined at the working face, the overlying rock strata collapse, inevitably causing varying degrees of ground subsidence. This damages the surface aquifer and threatens the safety of surface structures (such as roads and buildings). Second, coal mining or development excavation generates large amounts of solid waste, such as gangue and coal slime. These mining solid wastes are directly discharged onto the surface, forming open-pit gangue heaps, which seriously impact the surface ecological environment. To address these technical issues, the current methods used are gangue filling or paste filling.

[0003] For the gangue filling method: after one or several cuts of coal are mined in front of the working face, the coal mining operation is stopped, the support is pulled one step away to free up the filling space at the rear of the working face, and then the porous bottom-discharging scraper conveyor hanging on the rear beam of the support, the transfer conveyor at the end of the working face, the belt conveyor in the tunnel and other equipment are started in sequence to transport the gangue from the tunnel to the working face, and the gangue is leaked into the filling space at the rear of the working face through the porous bottom-discharging scraper conveyor. After the filling operation is completed, the working face starts coal mining again, and then repeats the cycle.

[0004] For the paste filling method: After one or more cuts of coal are mined in front of the working face, mining is stopped and the support is moved back a step to clear the filling space behind the working face. The filling bags are then tied to the hydraulic support and the paste or other filling material is injected into each bag sequentially through a pipeline. After the filling operation is completed, the paste must solidify and reach a certain strength before coal mining can resume at the working face. This cycle repeats.

[0005] Both of the above-mentioned filling methods cannot realize the parallel operation of coal mining and filling. Filling is not possible during coal mining, and coal mining is not possible during filling. The working face efficiency is low, and the coal production is only 1 / 3 to 1 / 4 of the longwall full caving mining process, which seriously affects the mining efficiency and is difficult to promote. Summary of the Invention

[0006] The present invention provides a method for parallel operation of coal mining and filling, which is used to solve the defect in the prior art that it is difficult to achieve both environmental protection and efficiency, and realizes parallel operation of coal mining and filling.

[0007] The present invention provides a method for parallel operation of coal mining and filling. The system for parallel operation of coal mining and filling comprises:

[0008] Coal production equipment, wherein the coal production equipment is suitable for being arranged behind the coal seam to be mined, and a coal transportation lane and a material transportation lane are arranged on both sides of the coal seam to be mined, and the coal transportation lane and the material transportation lane both extend from front to back to the area where the coal production equipment is located;

[0009] a retractable support and separation device, the retractable support and separation device being adapted to be arranged behind the coal production equipment and spaced apart from the coal production equipment;

[0010] The filling equipment is suitable for being arranged behind the retractable supporting and separating equipment, and is used for filling the goaf behind the retractable supporting and separating equipment with fillers, and a filler transport lane for transporting the fillers is arranged on at least one side of the goaf.

[0011] According to a method for parallel operation of coal mining and filling provided by the present invention, the filling transportation tunnel comprises a paste transportation tunnel and a gangue transportation tunnel respectively located on both sides of the goaf;

[0012] The filling equipment includes a paste filling equipment and a gangue filling equipment. The paste filling equipment is connected to a paste transport pipeline arranged in the paste transport lane, and the gangue filling equipment is connected to a gangue conveyor arranged in the gangue transport lane.

[0013] According to a method for parallel coal mining and filling provided by the present invention, the paste filling equipment and the gangue filling equipment are used to generate paste strip columns and gangue strip columns that are staggered in the front-to-back direction.

[0014] According to a method for parallel coal mining and filling operations provided by the present invention, the goaf is provided with a filling bag supported by the retractable support and separation device, and the paste filling device is used to fill the filling bag with paste.

[0015] According to a method for parallel coal mining and filling operations provided by the present invention, the gangue filling equipment is used to fill gangue between two adjacent paste strip columns.

[0016] According to a method for parallel coal mining and filling operations provided by the present invention, the paste transport tunnel and the gangue transport tunnel are retained after the goaf is filled.

[0017] According to a method for parallel coal mining and filling operations provided by the present invention, the retractable support and separation equipment includes: a front support structure, a rear support structure, a hydraulic push structure and a baffle. The front support structure and the rear support structure are arranged at intervals in the front-to-back direction and are connected by the hydraulic push structure. The baffle is installed behind the rear support structure.

[0018] According to a method for parallel coal mining and filling operations provided by the present invention, the retractable support and separation equipment includes: a hydraulic push structure, a baffle and a plurality of gas stack supports distributed along the front and rear directions, two adjacent gas stack supports are connected by the hydraulic push structure, and the baffle is installed behind the last gas stack support.

[0019] According to a method for parallel operation of coal mining and filling provided by the present invention, the airflow direction of the ventilation system of the system for parallel operation of coal mining and filling is from front to back.

[0020] According to a method for parallel coal mining and filling operations provided by the present invention, the coal transport lane and the material transport lane form an air inlet channel of the ventilation system, and the filler transport lane forms an air exhaust channel of the ventilation system.

[0021] The method of parallel operation of coal mining and filling provided by the present invention can prevent the roof from collapsing when the working face advances by arranging a retractable support separation device between the coal production equipment and the filling equipment. In addition, combined with the tunnels in the front and rear directions, the coal mining operation area and the filling operation area that do not interfere with each other are separated, so that coal mining and filling can be carried out in parallel, which greatly improves the coal mining efficiency while meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a system for parallel coal mining and filling operations provided by the present invention;

[0024] Figure 2 This is one of the cross-sectional views of the system for parallel coal mining and backfilling provided by the present invention during operation;

[0025] Figure 3 This is the second cross-sectional view of the coal mining and filling parallel operation system provided by the present invention during operation.

[0026] Reference numerals:

[0027] Coal production equipment 100, coal seam to be mined 101, material transport tunnel 102, coal transport tunnel 103, coal mining machine 104, hydraulic support 105, scraper conveyor 106, roof 109;

[0028] Retractable support and separation equipment 200, front support structure 201, rear support structure 202, hydraulic push structure 203, baffle 204;

[0029] Filling equipment 300, paste transport tunnel 301, paste transport pipeline 302, filling bag 303, paste strip column 304, gangue transport tunnel 305, belt conveyor 306, transfer machine 307, gangue thrower 308, gangue strip column 309. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] The following combination Figure 1-Figure 3 The method of the present invention for the simultaneous operation of coal mining and filling is described.

[0032] like Figure 1 As shown, the method for parallel operation of coal mining and filling provided by an embodiment of the present invention adopts a system for parallel operation of coal mining and filling. The system for parallel operation of coal mining and filling includes: coal production equipment 100, retractable support and separation equipment 200 and filling equipment 300.

[0033] The coal production equipment 100 is suitable for being arranged behind the coal seam 101 to be mined. The coal production equipment 100 is used for mining. In actual operation, Figure 2 and Figure 3 As shown, the coal production equipment 100 is suitable for being arranged behind the coal seam 101 to be mined.

[0034] like Figure 1-Figure 3 As shown, the coal production equipment 100 includes: a coal mining machine 104, a hydraulic support 105, a scraper conveyor 106 and a roof 109.

[0035] The roof 109 is located at the top of the tunnel, the hydraulic support 105 is used to support the roof 109, and the coal mining machine 104 is used to reciprocate coal mining along the scraper conveyor 106.

[0036] A coal transport tunnel 103 and a material transport tunnel 102 are arranged on both sides of the coal seam 101 to be mined. The coal transport tunnel 103 and the material transport tunnel 102 extend from front to back to the area where the coal production equipment 100 is located. The relevant materials in the coal mining process of the coal production equipment 100 are transported from the ground to the working area through the material transport tunnel 102.

[0037] During production, the coal production equipment 100 advances along the operating direction, and the coal produced by the coal production equipment 100 is transported to the ground through the coal transportation tunnel 103. After the coal is mined, a goaf is formed behind the coal production equipment 100. If the rear of the coal production equipment 100 is not filled, the roof 109 behind the hydraulic support 105 will usually collapse naturally, and the ground surface will produce a certain deformation.

[0038] like Figure 1-Figure 3 As shown, the retractable supporting and separating device 200 is suitable for being arranged behind the coal production equipment 100 , and the retractable supporting and separating device 200 is spaced apart from the coal production equipment 100 , and the retractable supporting and separating device 200 is arranged between the coal production equipment 100 and the filling equipment 300 .

[0039] The retractable support and separation device 200 maintains a certain distance from the hydraulic support 105. After the hydraulic support 105 of the coal production equipment 100 moves forward, the retractable support and separation device 200 can still safely support the roof 109 within a certain range in front and behind, thereby realizing the separation of the coal production equipment 100 and the filling equipment 300.

[0040] The filling device 300 is suitable for being arranged behind the telescopic supporting and separating device 200. The filling device 300 is used to fill the goaf behind the telescopic supporting and separating device 200 with fillers, and a filler transport tunnel for transporting fillers is arranged on at least one side of the goaf.

[0041] The filling equipment 300 is used to timely support and seal the exposed roof 109 behind the coal mining working face to prevent the roof 109 from collapsing due to a large exposed area when the working face advances faster. On the other hand, it can be used as a roof protection structure and retaining wall for filling operations.

[0042] It can be understood that the retractable support and separation equipment 200 divides the tunnel into a front coal mining operation area and a rear goaf area, and the coal transportation in the front coal mining operation area does not pass through the rear goaf area, and the filling material transportation in the rear goaf area does not need to pass through the front coal mining operation area during filling.

[0043] That is, during coal mining operations, the coal production equipment 100 is not affected by the filling operations, ensuring the normal advancement speed. The retractable support and separation equipment 200 can support the large-scale exposed roof 109, and the filling operation can be carried out uninterruptedly under the separation and support of the retractable support and separation equipment 200, thus realizing true parallel operations of coal mining and filling.

[0044] According to the method of parallel operation of coal mining and filling according to an embodiment of the present invention, by arranging a retractable support and separation device 200 between the coal production equipment 100 and the filling equipment 300, the roof 109 can be prevented from collapsing when the working face advances, and combined with the tunnels in the front and rear directions, the coal mining operation area and the filling operation area that do not interfere with each other are separated, so that coal mining and filling can be carried out in parallel, reducing the impact of filling on the coal mining operation, speeding up the coal mining speed as much as possible, achieving green mining, and producing more coal, thereby improving economic benefits.

[0045] In some embodiments, the retractable support and separation device 200 can be a flexible support device that can meet the requirements for supporting the exposed roof behind the working face after rapid coal mining. The retractable support and separation device 200 has a retractable support range. When the mining speed of the coal mining face exceeds the maximum filling speed, the support range can be adjusted to ensure safe support between the coal mining face and the filling operation area. The following describes two structural forms of flexible support devices.

[0046] like Figure 2 and Figure 3 As shown, in some embodiments, the retractable support and separation device 200 may include: a front support structure 201, a rear support structure 202, a hydraulic push structure 203 and a baffle 204. The front support structure 201 and the rear support structure 202 are arranged at intervals in the front and rear directions and are connected by the hydraulic push structure 203. The baffle 204 is installed behind the rear support structure 202.

[0047] The front support structure 201 and the rear support structure 202 are connected by a hydraulic sliding structure 203. The front support structure 201 and the rear support structure 202 usually adopt a box-type top beam structure supported by hydraulic columns, and a drawer-type telescopic beam is provided on the top that can be freely extended to close the top plate 109 in a certain range in front and behind the front support structure 201 and the rear support structure 202.

[0048] The front support structure 201 and the rear support structure 202 can serve as fulcrums for each other to move forward. A baffle 204 is installed behind the rear support structure 202 to serve as a temporary retaining wall for filling materials. On the one hand, the retractable support and separation equipment 200 is used to support the exposed top plate 109 after the front hydraulic support 105 moves forward quickly. On the other hand, it can also help form a working space and temporary retaining wall for filling operations.

[0049] In other embodiments, the retractable support and separation device 200 may include: a hydraulic push structure, a baffle and a plurality of air stack supports distributed along the front-to-back direction, wherein two adjacent air stack supports are connected by the hydraulic push structure, and the baffle is installed behind the last air stack support.

[0050] In other words, the retractable support and separation equipment 200 may include several rows of gas stack supports connected in series, each row of stack supports is arranged along the entire length of the working surface, and the adjacent rows of stack supports are connected by a hydraulic push structure, and serve as fulcrums for each other to achieve step-by-step forward movement. A baffle is also provided on the rear side of the last row of stack supports, which can be used as a template or retaining wall for strip filling. Since the main material of the gas stack supports is rubber, each gas stack support is composed of several layers of stacked pancake-shaped air bags. After the interior is filled with high-pressure gas, it has a high support strength. Due to its light weight and strong flexibility, it can meet the requirements of adjustable retractable support for the top plate 109 within a range of 10-20m in the forward direction.

[0051] like Figure 2 As shown, in some embodiments, the filler transport tunnel includes a paste transport tunnel 301 and a gangue transport tunnel 305 , and the paste transport tunnel 301 and the gangue transport tunnel 305 are respectively located on both sides of the goaf.

[0052] like Figure 1 As shown, the filling equipment 300 includes a paste filling equipment and a gangue filling equipment. The paste filling equipment is connected to a paste transport pipeline 302 arranged in a paste transport lane 301, and the gangue filling equipment is connected to a gangue conveyor arranged in the gangue transport lane.

[0053] In other words, the filling operation area of ​​the system of parallel coal mining and filling in this embodiment can carry out paste filling and gangue filling at the same time. The two types of filling rely on their own equipment and independent filling transportation tunnels respectively, and do not interfere with each other in time and space. Not only does the mutual interference between the systems completely disappear, but the filling efficiency is also doubled.

[0054] The use of two sets of filling equipment for paste and gangue is equivalent to simultaneous operation of filling points without interfering with each other, which not only reduces the filling time by more than 50%, but also fully utilizes the respective advantages of paste and gangue filling, and realizes the interweaving of gangue strips and paste strips, thereby maximizing technology, economy and benefits.

[0055] like Figure 2 and Figure 3 As shown, in some embodiments, the paste filling device and the gangue filling device are used to generate paste strip columns 304 and gangue strip columns 309 that are staggered in the front-to-back direction.

[0056] By using paste strip columns 304 and gangue strip columns 309 for alternate support in the goaf, the advantages of high paste filling strength, good top connection and fast filling speed are utilized, and the characteristics of low cost and simple operation of gangue filling are combined.

[0057] In some embodiments, the paste transport tunnel 301 and the gangue transport tunnel 305 are retained after the goaf is filled.

[0058] It can be understood that the paste transport tunnel 301 and the gangue transport tunnel 305 have achieved tunnel retention along the air. These two originally abandoned tunnels have been supported and strengthened through the filling process and can be used for subsequent working face mining. They can be reused when the adjacent working face of the tunnel is mined, realizing dual use of one tunnel and reducing the excavation investment of the two tunnels.

[0059] like Figure 2 and Figure 3 As shown, in some embodiments, a filling bag 303 supported by the retractable support and separation device 200 is provided in the goaf, and the paste filling device is used to fill the filling bag 303 with paste.

[0060] During actual operation, the mixed paste (slurry) of cement, gangue, fly ash, etc. that has been crushed and mixed on the ground is transported to the area through the paste transport pipeline 302, and then pumped into the filling bag 303 with self-supporting function. After the paste is solidified and strengthened, it serves as a paste strip column 304 to support the top plate 109.

[0061] Along the left and right directions, multiple filling bags 303 can be arranged side by side, and multiple filling bags 303 are arranged in a "single" shape. The mixed paste of cement, gangue, fly ash, etc. processed on the ground enters the filling operation area through the paste transportation pipeline 302, and then is injected into the filling bags 303 arranged in a "single" shape. After the paste solidifies quickly and has a certain strength, a paste strip column 304 is formed to support the top plate 109. Then, the retractable support and separation device 200 can move forward one or several steps and enter the filling work of the next strip.

[0062] Paste filling has good roof connection effect and high strength, but it is costly and takes a long time to solidify. By using spaced strips for paste filling, the filling speed can be guaranteed while supporting the top plate 109 and reducing costs.

[0063] like Figure 2 and Figure 3 As shown, in some embodiments, the gangue filling device is used to fill gangue between two adjacent paste strip columns 304 .

[0064] Gangue filling is carried out in the space between two adjacent paste filling strip columns. The gangue on the ground is transported to the gangue transport tunnel 305 by the belt conveyor 306, and then transferred to the gangue thrower 308 by the transfer machine 307 and thrown into the filling space to form the gangue filling strip column supporting the top plate 109.

[0065] During actual operation, a belt conveyor 306 is laid in the gangue transport tunnel 305 to transport solid waste materials such as gangue from the ground or underground into the gangue transport tunnel 305, and then the paste filling operation is delayed by one or several steps to fill the gangue strips in the space between the two paste strip columns 304. Specifically, the gangue transported by the belt conveyor 306 is transferred to the gangue thrower 308 through the retractable transfer machine 307, and the gangue thrower 308 performs backward gangue filling in the space between the two paste strip columns 304. After the operation is completed, the gangue strip columns 309 are formed to support the top plate 109.

[0066] The cost of gangue filling is low and the process is simple, but there is a certain amount of shrinkage after filling. Gangue filling between two paste filling strip columns can not only process the gangue and protect the ecology, but also support the roof 109. More importantly, by adopting the parallel operation method of coal mining and filling, the tunnels where the paste transportation tunnel 301 and the gangue transportation tunnel 305 are located are filled and supported from the abandoned state and converted to reuse, realizing the retention of tunnels along the air in the two tunnels. These two tunnels can also be reused when the coal bodies on both sides are mined, and there is no need to re-dig the tunnels, which greatly reduces the mining cost.

[0067] In some embodiments, the airflow direction of the ventilation system of the system for concurrent coal mining and backfilling is from front to back.

[0068] In other words, the fresh air flow direction of the system for parallel mining and filling operations in this embodiment is different from the traditional coal mining ventilation method. The material transportation tunnel 102 and the coal transportation tunnel 103 on both sides of the coal seam 101 to be mined are both fresh air flow inlet channels.

[0069] The coal transport lane 103 and the material transport lane 102 form an air inlet passage of the ventilation system, and the filler transport lane forms an air exhaust passage of the ventilation system.

[0070] In this way, the ventilation method of the system with parallel mining and filling operations is "H" type, that is, fresh air flows in from the coal transport tunnel 103 and the material transport tunnel 102, meets the air needs of the coal production equipment 100, and then enters the area where the retractable support and separation equipment 200 and the filling equipment 300 of the working face are located. The finally formed polluted air is discharged through the paste transport tunnel 301 and the gangue transport tunnel 305 respectively, realizing full coverage of all working areas of the working face by fresh air.

[0071] A specific embodiment of the present invention is described below.

[0072] The coal mining and filling parallel operation system has a coal production and transportation system in front of the coal mining face. The thickness of the coal seam 101 to be mined is , long for , the daily advancement distance is The bulk density of coal is , then the daily coal production for: .

[0073] A retractable support and separation device 200 is provided behind the coal mining operation face for isolating the filling operation, thereby realizing the separation of coal mining support and filling support. The retractable support and separation device 200 may be a flexible support system to realize forward and backward extension.

[0074] The telescopic support and separation device 200 is supported by a hydraulic support 105 or an air stack support, and is composed of two or more rows of supports, which can be mutually used as fulcrums to achieve step-forward movement. If the inherent width of the telescopic support and separation device 200 is , requiring that its telescopic range should not be less than That is, after the hydraulic support 105 moves forward, the telescopic support and separation device 200 can still realize the front and rear The top plate 109 of the range is safely supported.

[0075] The filling process includes two steps: gangue strip + paste strip interval filling. On the one hand, it can take advantage of the good top connection effect of paste filling and the fact that gangue filling does not require consolidation. On the other hand, it can avoid the weaknesses of gangue filling without top connection and paste filling with a long consolidation time. In addition, the two working areas are filled at the same time, which improves the working efficiency. If the working face advances the distance of , the top plate 109 in this range needs to be filled, that is, the width of the paste filling strip column is , the width of the gangue filling strip column is ,satisfy .

[0076] The front is the coal mining work area, which can realize regular coal mining operation without filling interference. The two sides of the goaf are filling operation areas, one of which is for filling of paste strip column 304. The daily filling volume of paste is satisfy On the other side, the gangue strip column 309 is filled. The daily filling volume of gangue is satisfy , the operations in the two filling operation areas do not interfere with each other.

[0077] When filling the paste strip column 304, it is first necessary to inject paste material into the filling bag 303 with self-supporting function. After solidification and strengthening, it serves as the paste strip column 304 to support the top plate 109. The gangue filling is carried out between the two paste filling columns, and the space is filled with gangue by using a manually operated or remotely controlled retractable gangue thrower 308.

[0078] The ventilation system of this system for parallel mining and filling operations is different from related technologies. The working face ventilation method is designed as an "H" type, that is, fresh air flows in from the material transport tunnel 102 and the coal transport tunnel 103 on both sides of the working face. After meeting the air demand for mining and filling operations, the polluted air is discharged from both sides of the goaf, realizing full coverage of the three working areas by fresh air.

[0079] Coal mining operations are not affected by filling operations, and filling operations are not interfered with by coal mining operations. They can be carried out 24 hours a day, realizing parallel operations of coal mining and filling in the true sense.

[0080] The system for parallel coal mining and backfilling of the present invention has the following advantages over related technologies:

[0081] (1) By adjusting or optimizing the coal mining and filling operations in terms of transportation routes, support systems, filling processes, operating intervals, and ventilation systems, the real parallel operation of coal mining and filling is achieved, which is conducive to the promotion of filling coal mining technology and its high production and high efficiency;

[0082] (2) By separating coal transportation and filling material transportation from the transportation route, the interference and impact between them are reduced;

[0083] (3) A new set of retractable support separation equipment 200 was added behind the original support of the working face, which is specially used for filling operations, realizing the separation of the coal mining support system and the filling support system;

[0084] (4) The use of an intermittent filling process of gangue strips and paste strips successfully avoids the weaknesses of poor gangue filling joint effect and long consolidation time of paste filling. It also fully utilizes the advantages of paste filling, such as good joint effect, high support strength, simple gangue filling process and no need for consolidation, thus reducing costs and improving efficiency.

[0085] (5) The two filling operation areas are filled at the same time without being subordinate to or interfering with each other, which improves the efficiency of the filling operation;

[0086] (6) The ventilation mode of the working face is designed to be an "H" type, that is, the air flow is taken in by two roadways on the solid coal side and returned by two roadways on the goaf side, which is conducive to the timely removal of dust from the filling operation and realizes the full coverage of the three working areas of the working face by fresh air flow;

[0087] (7) Coal mining operations are not affected by filling operations, and filling operations are not interfered with by coal mining. They can be carried out 24 hours a day, realizing the parallel operation of coal mining and filling in the true sense;

[0088] (8) The low-cost retention of two tunnels along the goaf creates conditions for coal mining on both sides of the working face by digging two fewer tunnels, which not only enables coal mining and filling to be carried out in parallel without interference, but also reduces filling costs.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A method for parallel operation of coal mining and filling, using a system for parallel operation of coal mining and filling, characterized in that: The system for parallel operation of coal mining and filling includes: Coal production equipment, wherein the coal production equipment is suitable for being arranged behind the coal seam to be mined, and a coal transportation lane and a material transportation lane are arranged on both sides of the coal seam to be mined, and the coal transportation lane and the material transportation lane both extend from front to back to the area where the coal production equipment is located; a retractable support and separation device, the retractable support and separation device being adapted to be arranged behind the coal production equipment and spaced apart from the coal production equipment; A filling device, wherein the filling device is suitable for being arranged behind the retractable support and separation device, and the filling device is used to fill the goaf behind the retractable support and separation device with filler, and a filler transport tunnel for transporting the filler is arranged on at least one side of the goaf; The retractable support and separation equipment includes a baffle, which is used as a temporary retaining wall for the filler; The retractable support and separation device can be extended and retracted forward and backward. When the mining speed of the coal mining face is faster than the maximum filling speed, the support range can be adjusted. After the hydraulic support of the coal production equipment moves forward, the retractable support and separation device can safely support the roof within a certain range in front and behind. The airflow direction of the ventilation system of the system in which coal mining and filling are carried out in parallel is from front to back; the coal transportation lane and the material transportation lane form the air inlet channel of the ventilation system, and the filler transportation lane forms the exhaust channel of the ventilation system. The coal transportation in the front coal mining operation area does not pass through the goaf in the rear, and the filler transportation in the goaf in the rear does not need to pass through the front coal mining operation area during filling.

2. The method for parallel operation of coal mining and filling according to claim 1, characterized in that: The filler transport tunnel includes a paste transport tunnel and a gangue transport tunnel respectively located on both sides of the goaf; The filling equipment includes a paste filling equipment and a gangue filling equipment. The paste filling equipment is connected to a paste transport pipeline arranged in the paste transport lane, and the gangue filling equipment is connected to a gangue conveyor arranged in the gangue transport lane.

3. The method for parallel operation of coal mining and filling according to claim 2, characterized in that: The paste filling equipment and the gangue filling equipment are used to generate paste strip columns and gangue strip columns that are staggered in the front-to-back direction.

4. The method for parallel operation of coal mining and filling according to claim 3, characterized in that: The goaf is provided with a filling bag supported by the retractable support and separation device, and the paste filling device is used to fill the filling bag with paste.

5. The method for parallel operation of coal mining and filling according to claim 3, characterized in that: The gangue filling device is used to fill gangue between two adjacent paste strip columns.

6. The method for parallel operation of coal mining and filling according to claim 2, characterized in that: The paste transport tunnel and the gangue transport tunnel are retained and can be reused after the goaf is filled.

7. The method for parallel operation of coal mining and backfilling according to any one of claims 1 to 5, characterized in that: The retractable supporting and separating equipment includes: a front supporting structure, a rear supporting structure, a hydraulic pushing structure and a baffle. The front supporting structure and the rear supporting structure are arranged at intervals in the front-to-back direction and are connected by the hydraulic pushing structure. The baffle is installed behind the rear supporting structure.

8. The method for parallel operation of coal mining and backfilling according to any one of claims 1 to 5, characterized in that: The retractable support and separation equipment includes: a hydraulic push structure, a baffle and a plurality of air stack supports distributed along the front-to-back direction, two adjacent air stack supports are connected by the hydraulic push structure, and the baffle is installed behind the last air stack support.

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