Tower building crushing and filling system

Abstract

The embodiment of the utility model provides a tower building crushing and filling system which comprises a building body, a buffer stock bin, a lifting device, a crushing device, a ball mill and a pumping device, the crushing device, the ball mill and the pumping device are arranged on the building body, and the ball mill is connected with the pumping device through a buffer tank; the building body comprises a first layer and a second layer which are sequentially arranged from bottom to top, the crushing device comprises a double-tooth-roller crusher arranged on the second layer and a four-tooth-roller crusher arranged on the first layer, the ball mill is arranged on the first layer, a discharging port of the double-tooth-roller crusher is connected with a feeding port of the four-tooth-roller crusher, and a discharging port of the four-tooth-roller crusher is connected with a discharging port of the ball mill. And a discharge port of the four-tooth-roller crusher is connected with a feed port of the ball mill through the lifting device and the buffer stock bin. According to the utility model, an independent building type building form is adopted, and the multi-stage crushing device is arranged in the building structure, so that crushed coal gangue materials are uniform in particle size, high in powder content, not easy to separate after pulping, small in pipeline resistance during filling and large in underground diffusion, and the filling effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coal mine crushing and filling equipment manufacturing, in particular to a tower crushing and filling system. BACKGROUND

[0002] Coal mining activities will leave a large number of goaf, if not timely processing, goaf size is more and more big, will cause goaf roof strata sudden collapse, not only endanger the safety of the operation, but also cause overburden strata even surface layer movement and deformation, serious time will lead to surface subsidence, ground fissure and other major geological disasters, cause serious damage to the surface buildings. Among them, coal gangue is a kind of mining solid waste, the large amount of gangue stacking, not only occupies the land, affects the ecological environment, gangue leaching water will pollute the surrounding soil and groundwater, and coal gangue contains certain combustible material, under suitable conditions, spontaneous combustion, emission of sulfur dioxide, nitrogen oxides, carbon oxides and harmful gas pollution such as smoke dust, affect the health of the residents in the mining area.

[0003] Based on this, the mining area generally realizes coal gangue separation through gangue filling: the gangue is crushed to a certain particle size by the crushing tower, mixed with water in the mixing and stirring device, and transported to the goaf or caving area by the filling pump. With the rapid development of the times, the problem of ground subsidence caused by abandoned coal mines is serious, and the coal pillar left by coal mining leads to low coal mining rate, wasting a large amount of coal resources underground. Therefore, a large amount of coal gangue is needed to fill the subsidence area to prevent ground subsidence and improve the coal mining rate.

[0004] However, the existing coal gangue crushing device occupies a large area of ground, has high construction cost and high maintenance and operation cost, which has become a major pain point in the industry. UTILITY MODEL CONTENTS

[0005] The embodiment of the utility model aims to provide a tower crushing and filling system to solve the problems in the prior art. In order to solve the technical problem, the embodiment of the utility model adopts the following technical scheme:

[0006] The embodiment of the utility model provides a tower crushing and filling system, which comprises a building body, a buffer bin, a lifting device, a crushing device, a ball mill and a pumping device arranged in the building body, the ball mill is connected with the pumping device through a buffer tank, the building body comprises a first layer and a second layer arranged in sequence from bottom to top, the crushing device comprises a double-toothed roller crusher arranged in the second layer and a four-toothed roller crusher arranged in the first layer, the ball mill is arranged in the first layer, the discharge port of the double-toothed roller crusher is connected with the feeding port of the four-toothed roller crusher, and the discharge port of the four-toothed roller crusher is connected with the feeding port of the ball mill through the lifting device and the buffer bin.

[0007] In some embodiments, the discharge port of the ball mill is connected with the filling device through a buffer tank.

[0008] In some embodiments, the discharge port of the four-toothed roller crusher is connected with the feeding port of the lifting device through a first conveying device.

[0009] In some embodiments, the discharge port of the lifting device is connected with the feeding port of the buffer bin through a second conveying device, and the discharge port of the buffer bin is connected with the feeding port of the ball mill.

[0010] In some embodiments, a third conveying device with weighing function is arranged between the discharge port of the buffer bin and the feeding port of the ball mill.

[0011] In some embodiments, the buffer bin is a vertical tank structure, and the feeding port of the buffer bin has a predetermined height and is higher than the height of the discharge port thereof.

[0012] In some embodiments, a dust removal device and a water tank are further arranged on the second layer.

[0013] In some embodiments, the double-toothed roller crusher is connected with a coal gangue raw gangue bin.

[0014] In some embodiments, the four-toothed roller crusher is connected with an external feeder.

[0015] In some embodiments, the filling device is arranged to convey the output material to a preset filling area, and the preset filling area includes one or more of a goaf, an accident pool, a separation layer area and a waste roadway.

[0016] The utility model discloses a building form is built separately to the floor body and sets up multistage crushing device in the floor body structure, so that the crushed coal gangue material particle size is uniform, the powder content is more, and the slurry is not easy to separate after pulping, the pipeline resistance is small when filling, the underground diffusion is big, and the filling effect is improved.

[0017] In addition, the overall land occupation is smaller, the devices in the floor body are highly integrated, various equipment and functions are possessed, the application of conveying devices is reduced in the process to save energy consumption, centralized monitoring and intelligent control are facilitated, operation and maintenance are more convenient, and various requirements are highly met. Meanwhile, by adopting the mode of "double-toothed roller crusher + four-toothed roller crusher + ball mill", the feeding particle size of the ball mill can be reduced by realizing multistage crushing before the ball mill, the purpose of more crushing and less grinding is achieved, the power of the ball mill is reduced, and energy consumption is saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Fig. 1 It is a first schematic view of the plane structure of the embodiment of the tower building crushing and filling system of the present application.

[0020] Fig. 2 It is a first schematic view of the three-dimensional structure of the embodiment of the tower building crushing and filling system of the present application.

[0021] Fig. 3 It is a second schematic view of the three-dimensional structure of the embodiment of the tower building crushing and filling system of the present application.

[0022] Reference signs:

[0023] 1 - two-toothed roller crusher; 2 - lifting device; 3 - second conveying device; 4 - buffer bin; 5 - four-toothed roller crusher; 6 - first conveying device; 7 - weighing belt; 8 - dust removal device; 9 - water tank; 10 - centralized control room; 12 - pumping device; 13 - buffer tank; 14 - ball mill; 20 - building body. DETAILED DESCRIPTION

[0024] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0025] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be taken as limiting, but merely as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present application.

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0027] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example only, with reference to the attached drawings.

[0028] It should also be understood that, although the present application has been described with reference to some specific examples, a person skilled in the art can certainly implement many other equivalent forms of the present application, which have the characteristics as claimed and thus all fall within the protection scope defined thereby.

[0029] The above and other aspects, features, and advantages of the present application will become more apparent with reference to the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0030] The specific embodiments of the present application will be described with reference to the drawings; however, it is to be understood that the application is by no means limited to the embodiments described, but can be carried out in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details described herein are not intended to be limiting, but are merely representative of the application for the purpose of teaching a person skilled in the art to use the application in substantially any appropriate detailed structure.

[0031] The present specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more of the same or different embodiments of the application.

[0032] The embodiment of the present application provides a tower crushing and filling system for crushing coal gangue, tailings and construction waste and other materials into a particle size suitable for filling a goaf and filling, in which the tower crushing and filling system comprises a crushing system and a filling device, the crushing system is used for crushing materials and conveying the materials crushed to a predetermined particle size to the filling device, and the crushing system comprises a tower body, and the tower structure used by the tower crushing and filling system comprises but is not limited to a steel structure tower and a concrete tower.

[0033] The filling device is configured to convey the materials output by the crushing system to a preset filling area. The preset filling area herein includes one or more of a goaf, an accident pool, a separation layer area and an abandoned roadway, for example. Specifically, the filling device is configured to mix the materials crushed by the crushing system with mixed additives (such as water, fly ash, cement, etc.), and convey the mixed materials to the goaf. In order to avoid injecting unsuitable materials into the goaf in case of failure, the filling device can also convey the materials to an accident pool (such as a separation layer area, etc.). The filling device can use a pumping device, such as a plunger pump, a mud pump, a slurry pump, a centrifugal pump or a vane pump, etc.

[0034] Further, in the embodiment, in view of the problems of the existing building type coal gangue slurry filling process, such as high return of broken material, low efficiency, difficult gradation adjustment, low adaptability of coal gangue moisture content, pipe blockage, poor filling effect, uneven mixing of broken material and slurry, and the problems of the existing building type structure, such as low concentration, poor structural stability, high power and low efficiency of the whole machine, and high operating cost, the embodiment sets a crushing building, so as to realize multiple operations such as multi-stage crushing, grinding and filling in the crushing building.

[0035] In one embodiment, the building body includes a building body, the crushing devices are multiple, the multiple crushing devices are respectively arranged on different floors of the building body, the discharge port of the crushing device on the upper layer is connected with the feeding port of the crushing device on the next layer, and the crushing device on the lowest layer in all the crushing devices is connected with the filling device through a mixing device. The frame structure here can be installed on the ground by building a foundation, the building body adopts a building body structure, and the building body structure and process based on the building body have the characteristics of small construction cost, compact structure, small land occupation area, and high applicable floor height. The building body especially adopts a building body structure of steel structure, which has the advantages of short construction period, small land occupation area, and high equipment integration, can effectively implement equipment operation process monitoring, improve the automation degree, and facilitate maintenance and repair.

[0036] Further, the crushing system further includes a ball mill, a buffer bin and a lifting device, the ball mill is arranged in the building body or on the ground outside the building body, the crushing devices are arranged on multiple floors in the building body, the discharge port of the crushing device is connected with the feeding port of the ball mill through the lifting device and the buffer bin, and the discharge port of the ball mill is connected with the filling device through a buffer tank. The buffer bin and the lifting device here are arranged outside the building body.

[0037] Further, in the embodiment, the material is crushed by the crushing device, the lifting device is used to transport the crushed material into the buffer bin, and the material discharged from the buffer bin is ground in the ball mill.

[0038] In the embodiment, the building comprises a first floor and a second floor arranged vertically, wherein the first floor is arranged on the ground, and the second floor is arranged above the first floor. A crushing device is arranged on the first floor and the second floor respectively, and a ball mill is arranged on the first floor. The crushing device arranged on the second floor is connected with the coal gangue raw gangue bin to receive materials from the coal gangue raw gangue bin and crush the materials. The crushing device arranged on the second floor is a double-toothed roll crusher, and the crushing device arranged on the first floor is a four-toothed roll crusher. The discharge port of the double-toothed roll crusher is connected with the feeding port of the four-toothed roll crusher.

[0039] Further, the discharge port of the four-toothed roll crusher is connected with the feeding port of the ball mill through the lifting device and the buffer bin. Specifically, the lifting device is arranged outside the staircase. The discharge port of the four-toothed roll crusher is connected with the feeding port of the lifting device through a first conveying device. The feeding port of the lifting device is arranged on the first floor, for example. The lifting device lifts the materials in the vertical direction, for example. The discharge port of the lifting device is connected with the feeding port of the buffer bin through a second conveying device. The buffer bin has a vertical tank structure.

[0040] Further, the discharge port of the buffer bin is arranged at the height of the first floor, for example. The feeding port of the buffer bin generally has a predetermined height and is higher than the height of the discharge port. For example, the height of the feeding port of the buffer bin can be the height of the second floor. The height of the buffer bin is related to the amount of materials required. The buffer bin can effectively control the feeding amount of the ball mill, so as to adjust the amount of materials for grinding.

[0041] Specifically, the crushed materials are lifted to a predetermined height by the lifting device and are conveyed into the feeding port of the buffer bin through the second conveying device. The materials are discharged from the discharge port of the buffer bin. Further, a third conveying device with a weighing function is arranged between the discharge port of the buffer bin and the feeding port of the ball mill. In this way, the materials crushed by the plurality of crushing devices are discharged from the buffer bin and are ground by the ball mill,

[0042] In this way, the discharge port of the buffer bin is connected with the feeding port of the third conveying device. The third conveying device can be a weighing belt, for example. The discharge port of the third conveying device is connected with the feeding port of the ball mill. The third conveying device is used to measure the volume or weight of the materials while conveying the materials.

[0043] Finally, the weighed material is ground in the ball mill, the discharge port of which is connected to the filling device, so that the crushed and ground material is mixed and filled into the underground goaf by, for example, a pumping device.

[0044] In addition, the second floor of the building is also provided with a dust removal device and a water tank.

[0045] In a specific embodiment, the tower crushing and filling system can realize multi-stage crushing and grinding of the material, so that relatively two crushing can realize more fine crushing and shaping based on particle size. Herein, specific description is made in combination with the drawings.

[0046] As Figs. 1-3 As shown in the figure, the building includes a building 20, a buffer bin 4 and a lifting device 2, the building 20 includes a first floor 20a and a second floor 20b arranged in sequence, wherein the first floor 20a is arranged on the ground, and the second floor 20b is located above the first floor 20a. Herein, the second floor 20b and the first floor 20a of the building 20 are respectively provided with a crushing device, and a ball mill 14 is further arranged on the first floor 20a, so as to realize multi-stage crushing and grinding of the material through two crushing devices and one ball mill.

[0047] Specifically, a double-toothed roller crusher 1 is arranged on the second floor 20b of the building 20, which is directly connected to the coal gangue raw gangue bin through, for example, a belt conveyor. Herein, the double-toothed roller crusher 1 can be flexibly arranged according to the position of the coal gangue raw gangue bin, without the need to set the position sequence and positioning. A four-toothed roller crusher 5 is arranged on the first floor 20a of the building 20. A ball mill 14, a buffer tank 13 and a pumping device 12 are arranged in sequence on the first floor 20a of the building 20.

[0048] Considering that the existing crushing devices generally adopt devices such as impact crushers, hammer crushers and jaw crushers, such devices generally have large size, large vibration, high frequency of replacement of wearing parts, high energy consumption and relatively uneven crushing of the material, which leads to obvious defects in the operation mode of coal gangue filling, mixing and filling. Therefore, in the present embodiment, a double-toothed roller crusher 1 and a four-toothed roller crusher 5 are respectively adopted. The size of the toothed roller crusher is small and the vibration is small, which has obvious advantages in matching with the building structure of the steel structure and the filling device. In addition, the material crushed by the toothed roller crusher is relatively uniform, and the toothed roller crusher has the advantages of low energy consumption and convenient maintenance.

[0049] In the embodiment, the double-toothed roller crusher 1 is arranged above the four-toothed roller crusher 5, and is connected to the four-toothed roller crusher 5 through a chute ladder as a conveying device, so as to ensure that the crushed material falling from the double-toothed roller crusher 1 enters the four-toothed roller crusher 5 by gravity, thereby forming a multi-stage crushing of the double-toothed roller crusher 1 and the four-toothed roller crusher 5.

[0050] In some embodiments, the four-toothed roller crusher 5 can also be used alone, for example, connected to an external feeder through a chute ladder, and the feeder is used to feed the four-toothed roller crusher 5.

[0051] The discharge port of the four-toothed roller crusher 5 is connected to the inlet of the lifting device 2 through the first conveying device 6, specifically, the discharge port of the four-toothed roller crusher 5 is connected to the inlet of the first conveying device 6, so that the crushed material falling from the four-toothed roller crusher 5 is conveyed to the inlet of the lifting device 2 through the first conveying device 6, and the material is lifted to a predetermined height by the lifting device 2, and the predetermined height corresponds to the inlet of the buffer bin 4.

[0052] Further, the discharge port of the lifting device 2 is connected to the inlet of the buffer bin 4 through the second conveying device 3, and the material falling from the lifting device 2 is conveyed to the second conveying device 3, and then transported to the inlet of the buffer bin 4 through the second conveying device 3.

[0053] The weighing belt 7 (equivalent to a third conveying device) is arranged below the discharge port of the buffer bin 4, and the weighing belt 7 can not only convey the material, but also weigh the volume or weight of the material, so that the material discharged from the buffer bin 4 is conveyed to the ball mill 14 after weighing through the weighing belt 7, and the ball mill 14 can not only realize grinding through grinding, but also obtain coal gangue material meeting the particle size requirement.

[0054] Preferably, the discharge port of the buffer bin 4 is arranged opposite to the inlet of the weighing belt 7, and the discharge port of the weighing belt 7 is arranged opposite to the inlet of the ball mill 14, so as to ensure that the material can be accurately conveyed without spilling.

[0055] Further, the material discharged from the discharge port of the buffer bin 4 is crushed and ground by the ball mill 14, and the coal gangue material crushed and ground by the ball mill 14 is conveyed to the buffer tank 13 for further mixing, and then filled to the underground goaf through the pumping device 12.

[0056] In addition, the highest layer of the building 20, for example, the second layer 20b is also provided with a dust removal device 8 and a water tank 9, and the dust removal operation of the whole system is performed through the cooperation of the dust removal device 8 and the water tank 9.

[0057] In the embodiment, the tower crushing and filling system further comprises a centralized control room 10 and a power distribution room, which can be arranged outside the building 20. The centralized control room 10 is provided with a filling centralized control system, which can realize independent start-stop control of individual devices in the tower crushing and filling system, interlocking protection control of multiple processes according to the process, one-key start-stop control of the whole system, and different requirements of different users. By using the automatic control system, the start-stop of the whole system and the start-stop of the equipment during pipe blockage maintenance can be automatically controlled, the centralized control reduces the operation difficulty, the operation is more convenient, and the operation cost is saved.

[0058] In the embodiment, the pulp preparation and filling process is realized by cooperation of the double-toothed roller crusher, the four-toothed roller crusher and the ball mill. On the one hand, the toothed roller crusher is used for multi-stage crushing, so that the crushing of the material is relatively uniform, and then the particle size of the crushed coal gangue material after the grinding of the ball mill is uniform, the powder content is high, the pulp is not easy to separate after preparation, the pipe resistance is small during filling, the underground diffusion is large, which is more beneficial to coal gangue filling and has good filling effect. The toothed roller crusher is used for multi-stage crushing, which can reduce the feed size of the ball mill, achieve the purpose of more crushing and less grinding, and reduce the power of the ball mill to save energy consumption. On the other hand, the ball mill is installed on the ground by building a foundation, and multiple multi-toothed roller crushers are arranged on the main frame according to the crushing order. The multi-toothed roller crusher has the advantages of small size and small vibration, so that the influence on the building is small, the overall land occupation area and height are effectively reduced, and the service life is prolonged.

[0059] In addition, considering that in the prior art, if a screening device is built to screen materials with qualified particle size, when the water content of the coal gangue is high, the screen is easy to be blocked. In the embodiment, the use of the ball mill can reduce the use of the screening device, effectively avoid the problem of screen blocking due to high water content of the coal gangue, reduce the process risk, reduce the operation cost, and improve the process efficiency.

[0060] The pulp preparation and filling process of the tower crushing and filling system in the embodiment is as follows: the coal gangue raw material is crushed by the double-toothed roller crusher 1 and the four-toothed roller crusher 5, then enters the buffer bin 4, and after discharging from the buffer bin 4, enters the ball mill 14 for grinding to a predetermined particle size, then enters the buffer tank 13 for mixing, and then is discharged to the underground filling area by the pumping device 12.

[0061] The above specific embodiment adopts a multi-stage crushing combination mode of "double-toothed roller crusher + four-toothed roller crusher + ball mill", the first stage crushing realized by the double-toothed roller crusher can crush the material with a particle size of not more than 300 mm to below 80 mm, the second stage crushing realized by the four-toothed roller crusher can crush the material with a particle size of not more than 80 mm to below 10 mm, and finally the ball mill can crush the material below 10 mm to below 3 mm.

[0062] In the embodiment, when the mode of "double-toothed roller crusher + four-toothed roller crusher + ball mill" is adopted, the multi-stage crushing realized before the ball mill can also reduce the feed particle size of the ball mill, achieve the purpose of more crushing and less grinding, reduce the power of the ball mill, and save energy consumption. For example, the feed particle size of the ball mill 14 is controlled to be not more than 10 mm, so that the particle size ratio of the plurality of multi-toothed roller crushers is controlled to be 4-5 stages, so that the coal gangue material can be crushed from 300 mm to below 10 mm based on three-stage crushing. Therefore, the combination mode of "double-toothed roller crusher + four-toothed roller crusher + ball mill" can simplify the crushing process, reduce the cost and energy consumption, and reduce the replacement of wear parts.

[0063] The embodiment adopts a separate building body type building form and sets multi-stage crushing devices in the building body structure, so that the particle size of the crushed coal gangue material is uniform, the powder content is high, the slurry is not easy to separate after being prepared, the pipeline resistance is small during filling, the underground diffusion is large, the filling effect is improved, in addition, the overall land occupation area is smaller, the devices in the building body are highly integrated, a plurality of equipment and functions are provided, the application of conveying devices is reduced during the process to save energy consumption, and centralized monitoring and intelligent control are facilitated, operation and maintenance are more convenient, and various requirements are met.

[0064] In addition, although each operation is described in a specific order, this should not be understood as requiring the operations to be performed in the specific order shown or in a sequential order. In certain circumstances, multitasking and parallel processing can be advantageous. Similarly, although several implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of separate embodiments can also be combined in a single embodiment. Conversely, various features described in the context of a single embodiment can also be separated and performed in multiple embodiments.

[0065] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0066] The utility model discloses make a detailed explanation to multiple embodiments of the utility model above, but the utility model is not limited to these specific embodiments, and the technical personnel of the art can make multiple variant and modified embodiments on the basis of the utility model concept, and these variant and modified all should fall into the range of the utility model required protection.

Claims

1. A tower break-up packing system characterized by, The building, the buffer bin, the lifting device, the crushing device, the ball mill and the pumping device, the ball mill is connected with the pumping device through the buffer tank; the building includes the first layer and the second layer arranged from bottom to top, the crushing device includes the double-toothed roll crusher arranged in the second layer and the four-toothed roll crusher arranged in the first layer, the ball mill is arranged in the first layer, the discharge port of the double-toothed roll crusher is connected with the feeding port of the four-toothed roll crusher, the discharge port of the four-toothed roll crusher is connected with the feeding port of the ball mill through the lifting device and the buffer bin.

2. The tower break pack system of claim 1, wherein, The discharge port of the ball mill is connected with the filling device through the buffer tank.

3. The tower break pack system of claim 1, wherein, The discharge port of the four-toothed roll crusher is connected with the feeding port of the lifting device through the first conveying device.

4. The tower break pack system of claim 1, wherein, The discharge port of the lifting device is connected with the feeding port of the buffer bin through the second conveying device, and the discharge port of the buffer bin is connected with the feeding port of the ball mill.

5. The tower break pack system of claim 4, wherein, A third conveying device with weighing function is arranged between the discharge port of the buffer bin and the feeding port of the ball mill.

6. The tower fill system of claim 1, wherein, The buffer bin is a vertical tank structure, the feeding port of the buffer bin has a predetermined height and is higher than the height of the discharge port.

7. The tower fill system of claim 1, wherein, A dust removal device and a water tank are further arranged on the second layer.

8. The tower fill system of claim 1, wherein, The double-toothed roll crusher is connected with the coal gangue raw gangue bin.

9. The tower fill system of claim 1, wherein, The four-toothed roll crusher is connected with the external feeder.

10. The tower break-up packing system of any one of claims 1-9, wherein, The pumping device is arranged to convey the output material to a preset filling area, and the preset filling area includes one or more of a goaf, an accident pool, a separation layer area and a waste roadway.

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