Cemented dry integrated filling method for goaf area at the end of open-pit mine

Abstract

The present invention discloses a method for cementing dry integrated filling of goaf in the end wall of an open-pit mine, which belongs to the technical field of mining. The method for cementing dry integrated filling of goaf in the end wall of an open-pit mine includes step one: constructing a filling borehole; step two: allowing different cementing raw materials to enter a mixing device, allowing solid filling materials to enter the goaf through the filling borehole; step three: starting the mixing device, allowing the gel material, aggregate and additive to be fully mixed in the mixing device to form a cementing material; step four: cementing filling and dry filling are carried out simultaneously until the goaf is completely filled. The present application realizes the integration of filling and management by connecting a gel material silo, an aggregate silo, an additive silo, a mixing device, a solid feeding device and a filling device in series to form a complete filling system. The goaf can be dry filled while the cementing filling is being carried out, thereby shortening the construction period and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of mining, and in particular to a cemented dry integrated filling method for a goaf area at an open-pit mine end wall. Background Art

[0002] Limited by the mining technology and the level of mining equipment, large open-pit mines currently use continuous miners to recover the residual coal at the end walls. However, the use of continuous miners to recover the residual coal at the end walls often leaves goafs and protective coal pillars. Large machinery and blasting work in open-pit mines often impose a large amount of impact loads on the end walls. The existence of goafs can easily lead to the instability of the end wall slopes under the action of long-term impact loads. Therefore, in order to solve the above problems, filling and treating the goafs is obviously a more appropriate treatment method. It can not only solve a series of environmental problems caused by the existence of goafs, but also recover and utilize the protective coal pillars after the filling is completed, which improves the recovery rate of residual coal, increases resource utilization, and also reduces the disguised filling cost.

[0003] In the prior art, most of the filling methods for the end wall goaf are single-purpose and cannot select different filling methods according to the type of the end wall goaf. Therefore, the density of the filling body often cannot meet the requirements. Therefore, there is an urgent need for a multi-purpose filling method that can be applied to end wall goafs in multiple scenarios to complete the management of open-pit end wall goafs. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cemented dry integrated filling method for the end wall goaf of an open-pit mine. Different filling methods can be selected according to the type of the end wall goaf, so that the density of the filling body meets the filling requirements, so as to complete the management of the open-pit end wall goaf.

[0005] According to the first aspect of the embodiment of the present invention, the method for cementing dry integrated filling of the goaf at the end wall of an open-pit mine includes the following steps: step 1: constructing a filling borehole on the roof of the goaf; step 2: opening a gel material silo, an aggregate silo and an additive silo to allow different cementing raw materials to enter a mixing device, and at the same time starting a solid feeding device to allow solid filling materials to enter the goaf through the filling borehole for dry filling; step 3: starting the mixing device to fully mix the gel material, aggregate and additive in the mixing device to form a cementing material; step 4: the mixing device transports the mixed cementing material to the filling device, the filling device transports the cementing material to the goaf, and performs jet filling on the top of the goaf, so that the cementing filling and dry filling are carried out simultaneously until the goaf is completely filled.

[0006] The method for cementing and dry-type integrated filling of the goaf area at the end wall of an open-pit mine according to an embodiment of the present invention has at least the following beneficial effects: by connecting the gel material silo, the aggregate silo, the additive silo, the mixing device, the solid feeding device and the filling device in series to form a complete filling system, the integration of filling and management is realized, and the goaf can be dry-filled while the cementing filling is carried out on the goaf, and the aggregate of the cementing material and the solid filling of the dry filling are all from coal waste. Therefore, not only the construction period is greatly shortened and the work efficiency is improved, but also the utilization rate of the coal waste is improved and the construction cost is reduced.

[0007] According to some embodiments of the present invention, in step two, the solid feeding device includes: a crushing mechanism, which is used to crush coal waste to provide solid filling materials; and a transportation mechanism, wherein the input end of the transportation mechanism is connected to the output end of the crushing mechanism, and the transportation mechanism is used to transport the solid filling materials to the filling device.

[0008] According to some embodiments of the present invention, in step three, water is injected into the mixing device through a water inlet pipe, and a water flow meter is provided on the water inlet pipe, and the water flow meter is used to control the water inlet amount of the mixing device.

[0009] According to some embodiments of the present invention, in step four, the filling device includes a slurry storage mechanism and a filling mechanism, the input end of the slurry storage mechanism is connected to the output end of the mixing device, and the input end of the filling mechanism is connected to the output end of the slurry storage mechanism, the slurry storage mechanism is used to store the binder material and apply pressure to the binder material so that the filling mechanism performs jet binder filling at the top of the goaf.

[0010] According to some embodiments of the present invention, the slurry storage mechanism includes: a slurry storage tank, a blocking portion is arranged on the tank wall of the slurry storage tank; a piston assembly, the piston assembly is slidably arranged in the slurry storage tank through a slider, the slider corresponds to the blocking portion, the piston assembly is connected to the tank wall of the slurry storage tank through an elastic member, the piston assembly has a first cavity, the piston assembly and the slurry storage tank are enclosed to form a second cavity, the first cavity and the second cavity are connected, and the second cavity is used to store a binder material; an air pump, the air pump is connected to the first cavity, the air pump extracts air in the first cavity, so that the piston assembly moves in a direction of reducing the volume of the second cavity, and presses the binder material in the second cavity into the filling device, when the slider is against the blocking portion, the piston assembly is disengaged from the slider and continues to move in the direction of reducing the volume of the second cavity until the first cavity is connected to the outside air, and the piston assembly is reset under the action of the elastic member.

[0011] According to some embodiments of the present invention, in step four, the filling mechanism includes: a feeding pipe, which is arranged in the filling borehole; a grouting pipe, the input end of the grouting pipe is connected to the output end of the slurry storage mechanism, the grouting pipe is passed through the feeding pipe, and the grouting pipe is used to transport the bonding material; a spherical nozzle, which is arranged at the output end of the grouting pipe, and a plurality of grouting holes are evenly opened on the spherical nozzle.

[0012] According to some embodiments of the present invention, in step four, the filling device further includes a cleaning component, which is located in the spherical nozzle. During the cementitious filling, the cleaning component cleans the spherical nozzle to prevent the cementitious material from clogging the grouting hole.

[0013] According to some embodiments of the present invention, the cleaning assembly includes: a fixing member, which is arranged in the spherical nozzle and is located on the radius of the spherical nozzle; a cleaning member, which is rotatably arranged on the fixing member, and has a scraping edge that matches the curvature of the inner wall of the spherical nozzle. The cleaning member is rotated around the fixing member and can clear the cementitious material blocked in the grouting hole.

[0014] According to some embodiments of the present invention, the discharge port of the feeding pipe is flush with the roof of the goaf.

[0015] According to some embodiments of the present invention, the particle size of the aggregate in the aggregate silo ranges from 6 mm to 10 mm, and the particle size of the solid filling material ranges from 20 mm to 40 mm.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 It is a schematic flow chart of a method for cementing dry-type integrated filling of goaf area at the end wall of an open-pit mine according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 Structural schematic diagram of cemented dry integrated filling method for goaf area at the end wall of medium open pit mine;

[0020] Figure 3 yes Figure 2 Structural schematic diagram of the intermediate slurry storage mechanism;

[0021] Figure 4 yes Figure 2 Schematic diagram of the structure of the filling mechanism.

[0022] Reference numerals:

[0023] Gel material silo 100;

[0024] Aggregate silo 200;

[0025] Additive silo 300;

[0026] Solid feeding device 400, crushing mechanism 410, transportation mechanism 420;

[0027] Mixing device 500, water inlet pipe 510, water flow meter 511;

[0028] Filling device 600, slurry storage mechanism 610, slurry storage tank 611, blocking part 6111, slide rail 6112, piston assembly 612, first piston 6121, second piston 6122, connecting piece 6123, elastic piece 613, first cavity 614, second cavity 615, slider 616, vacuum pump 617, filling mechanism 620, feeding pipe 621, guide part 6211, grouting pipe 622, spherical nozzle 623, grouting hole 6231, cleaning assembly 624, fixing piece 6241, cleaning piece 6242, scraping edge 6243. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] refer to Figures 1 to 4 The present invention describes a method for cementing dry integrated filling of goaf area at the end wall of an open-pit mine according to an embodiment of the present invention.

[0034] like Figures 1 to 4 As shown, the cementing dry integrated filling method for the open-pit mine end wall goaf according to an embodiment of the present invention includes:

[0035] Step 1: construct filling holes in the top plate of the goaf;

[0036] Step 2: Open the gel material bin 100, the aggregate bin 200 and the additive bin 300, so that different cementing raw materials enter the mixing device 500, and start the solid feeding device 400 at the same time, so that the solid filling material enters the goaf through the filling borehole for dry filling;

[0037] Step 3: Start the mixing device 500 to fully mix the gel material, aggregate and additives in the mixing device 500 to form a cementitious material;

[0038] Step 4: The mixing device 500 transports the mixed cementitious material to the filling device. The filling device transports the cementitious material to the goaf and performs jet filling on the top of the goaf, so that the cementitious filling and dry filling are carried out simultaneously until the goaf is completely filled.

[0039] By connecting the gel material silo 100, the aggregate silo 200, the additive silo 300, the mixing device 500, the storage device, the solid feeding device 400 and the filling device 600 in series to form a complete filling system, the integration of filling management is realized. The goaf can be dry-filled while the goaf is cemented and filled. The aggregate of the cementing material and the solid filling of the dry filling are all from coal waste. Therefore, not only the construction period is greatly shortened and the work efficiency is improved, but also the utilization rate of coal waste is improved, the construction cost is reduced, and the construction civilization construction is promoted.

[0040] It should be noted that end-to-side coal mining is to make full use of the open space conditions of the mining site during the open-pit coal mining process, and use underground mining methods to recover the residual coal outside the open-pit mine boundary, as the main supplement to the open-pit underground mining technology. The coal seam occurrence conditions in my country are relatively complex, and the coal resources are distributed over a vast area. There are huge reserves of thin coal seams and inclined coal seams. However, due to the limitations of current mining technology conditions, traditional underground and open-pit mining methods cannot effectively recover these resources. These coal seams have to be abandoned, resulting in huge waste of resources. A large number of outcropping coal seams and slope coal seams were not buried due to early unplanned mining, and there were serious fires and spontaneous combustion. It not only wastes resources, but also pollutes the surrounding environment. The end-to-side mining process is to more effectively recover these previously discarded or difficult-to-mine coal resources, and minimize the impact of coal resources on the environment.

[0041] Protective coal pillars are parts of the coal body that are deliberately left behind during the coal mining process to ensure safety and prevent damage to important buildings. Protective coal pillars help reduce or control risks in the mining process, such as surface movement and gas explosions. By protecting coal pillars, it is possible to avoid damage to water resources, geological stability, and hydrological conditions caused by mining activities. For buildings and other infrastructure on the ground, protective coal pillars help protect them from the adverse effects of mining operations, thereby safeguarding people's lives and property and social stability. The design of protective coal pillars needs to be determined based on specific geographical conditions, geological structures, and mining needs to ensure that both the requirements of safe production are met and the impact on the environment and society is minimized.

[0042] In some specific implementations of the present invention, coal waste mainly includes coal gangue and fly ash, among which coal gangue can be used as raw material for aggregate and dry filling. Furthermore, different filling methods require different material particle sizes. The aggregate particle size range in the aggregate silo is between 6mm and 10mm, and the particle size range of the solid filling material is between 20mm and 40mm.

[0043] In some specific implementations of the present invention, the solid feeding device 400 includes: a crushing mechanism 410, the crushing mechanism 410 is used to crush coal waste to provide solid filling materials; a transportation mechanism 420, the input end of the transportation mechanism 420 is connected to the output end of the crushing mechanism 410, and the transportation mechanism 420 is used to transport the solid filling materials to the filling device 600.

[0044] like Figure 2As shown, the crushing mechanism 410 is located on the right side of the transport mechanism 420, and the transport mechanism 420 is located on the right side of the filling device 600. Specifically, the output end of the crushing mechanism 410 corresponds to the input end of the transport mechanism 420, and the output end of the transport mechanism 420 corresponds to the input end of the filling device 600. Thus, the coal waste is collected in the crushing mechanism 410, crushed into the particle size required by the crushing mechanism 410, and then output to the transport mechanism 420, and then the transport mechanism 420 transports the solid filling material to the filling device 600, and finally enters the goaf through the filling device 600 to complete the dry filling of the goaf.

[0045] In some specific implementations of the present invention, in step four, the filling device 600 includes a slurry storage mechanism 610 and a filling mechanism 620, the input end of the slurry storage mechanism 610 is connected to the output end of the mixing device 500, and the input end of the filling mechanism 620 is connected to the output end of the slurry storage mechanism 610, and the slurry storage mechanism 610 is used to store the binder material and apply pressure to the binder material so that the filling mechanism 620 performs jet binder filling at the top of the goaf.

[0046] In some specific implementations of the present invention, the slurry storage mechanism 610 includes: a slurry storage tank 611, a blocking portion 6111 is provided on the tank wall of the slurry storage tank 611; a piston assembly 612, the piston assembly 612 is slidably arranged in the slurry storage tank 611 through a slider 616, the slider 616 corresponds to the blocking portion 6111, the piston assembly 612 is connected to the tank wall of the slurry storage tank 611 through an elastic member 613, the piston assembly 612 has a first cavity 614, the piston assembly 612 and the slurry storage tank 611 are enclosed to form a second cavity 615, the first cavity 614 is communicated with the second cavity 615, and the second cavity 61 5 is used to store the cementing material; the air pump 617 is connected with the first cavity 614, the air pump 617 extracts the air in the first cavity 614, so that the piston assembly 612 moves in the direction of reducing the volume of the second cavity 615, and presses the cementing material in the second cavity 615 into the filling device 600, when the slider 616 abuts against the blocking part 6111, the piston assembly 612 is separated from the slider 616 and continues to move in the direction of reducing the volume of the second cavity 615 until the first cavity 614 is connected with the outside air, and the piston assembly 612 is reset under the action of the elastic member 613.

[0047] like Figure 3As shown, the slurry storage tank 611 is opened upward, and two blocking protrusions are symmetrically arranged on the inner walls of the left and right ends of the slurry storage tank 611. The piston assembly 612 is movably arranged in the slurry storage tank 611. Specifically, the piston assembly 612 is in an I-shaped shape, and includes a first piston 6121 and a second piston 6122. The first piston 6121 and the second piston 6122 are connected by a connecting piece 6123, and the first piston 6121 is located above the second piston 6122. The blocking protrusion is located between the first piston 6121 and the second piston 6122. The width of the first piston 6121 corresponds to the distance between the two blocking protrusions extending left and right, and the width of the second piston 6122 corresponds to the width of the slurry storage tank 611 extending left and right. The second piston 6122 and the slurry storage tank 611 enclose a first cavity 614 for storing cementitious materials, and the first cavity 614 is connected to the air pump 617. An elastic member 613 is provided at the upper end of the first piston 6121, and the first piston 6121 is elastically connected to the upper end of the inner wall of the slurry storage tank 611 through the elastic member 613. Slide blocks 616 are provided at both left and right ends of the first piston 6121, and the cross section of the slide block 616 is inverted L-shaped and buckled on the first piston 6121. Correspondingly, slide rails 6112 matching the slide blocks 616 are provided on the inner walls at the left and right ends of the slurry storage tank 611, and the slide blocks 616 can slide along the extending direction of the slide rails 6112 to drive the piston assembly 612 to move up and down.

[0048] It can be seen that the air pump 617 extracts the air in the first cavity 614 to form an internal and external pressure difference. The piston assembly 612 moves downward along the slide rail 6112 under the drive of the slider 616 until the slider 616 abuts against the blocking portion 6111. During the movement of the piston assembly 612, the adhesive material in the first cavity 614 is compressed and output from the output end of the slurry storage tank 611 to achieve the jet-type adhesive filling of the filling device 600. As the air pump 617 continues to operate, the piston assembly 612 continues to move downward, and the slider 616 is separated from the first piston 6121 under the obstruction of the blocking portion 6111, so that the first cavity 614 is connected to the outside air to eliminate the pressure difference. At this time, the piston assembly 612 carries the slider 616 upward under the action of the elastic member 613 until the piston assembly 612 returns to its initial position, realizing the integration and automation of slurry storage and grouting.

[0049] In some specific implementations of the present invention, the filling device 600 includes: a feeding pipe 621, which is arranged in the filling borehole; a grouting pipe 622, the input end of the grouting pipe 622 is connected to the output end of the slurry storage mechanism 610, the grouting pipe 622 is passed through the feeding pipe 621, and the grouting pipe 622 is used to transport the bonding material; a spherical nozzle 623, which is arranged at the output end of the grouting pipe 622, and a plurality of grouting holes 6231 are evenly opened on the spherical nozzle 623.

[0050] like Figure 1 and Figure 4 As shown, the feeding pipe 621 is installed in the filling borehole, and the crushed solid filling material is introduced into the goaf; the grouting pipe 622 is installed in the feeding pipe 621, and the cementing material output from the slurry storage tank 611 is transported to the spherical nozzle 623. Specifically, the discharge port of the feeding pipe 621 is flush with the top plate of the goaf, the spherical nozzle 623 extends into the filling borehole, and its upper end is flush with the top plate of the goaf. There are a number of circular grouting holes 6231 evenly distributed on the spherical nozzle 623. The cementing material enters the spherical nozzle 623 through the grouting pipe 622, and is sprayed around the goaf from the grouting holes 6231 on the spherical nozzle 623. Therefore, the grouting pipe 622 is placed in the feeding pipe 621 and inserted into the filling borehole together with the feeding pipe 621. At the same time, the goaf is cemented and dry-filled, which is not only conducive to the formation of the filling body and improves the density and strength of the filling body, but also shortens the construction period and greatly improves work efficiency.

[0051] Specifically, the input end of the feeding pipe 621 has a guide portion 6211, and the horizontal cross-sectional diameter of the guide portion 6211 gradually increases in the direction away from the goaf, thereby expanding the input end area of ​​the feeding pipe 621 to facilitate the solid filling material to enter the goaf.

[0052] In some specific implementations of the present invention, the filling device 600 further includes a cleaning component 624 , which is located in the spherical nozzle 623 , and is used to prevent the grouting hole 6231 from being blocked.

[0053] In some specific embodiments of the present invention, the cleaning component 624 includes: a fixing member 6241, which is arranged in the spherical nozzle 623, and the fixing member 6241 is located on the radius of the spherical nozzle 623; a cleaning member 6242, which is rotatably arranged on the fixing member 6241, and the cleaning member 6242 has a scraping edge 6243 that matches the curvature of the inner wall of the spherical nozzle 623. The cleaning member 6242 is rotated around the fixing member 6241, and the cleaning member 6242 can clear the cementitious material blocked in the grouting hole 6231.

[0054] like Figure 4As shown, the grouting pipe 622 is coaxially arranged with the spherical nozzle 623 in the up-down direction, and the fixing member 6241 is also coaxially arranged with the spherical nozzle 623. Specifically, the lower end of the fixing member 6241 is fixed at the lowest point of the spherical nozzle 623 and extends in the vertical direction. The upper end of the fixing member 6241 is provided with a driving member, and the driving member is transmission-connected with the cleaning member 6242. The cleaning member 6242 is movably arranged on the fixing member 6241, and the cleaning member 6242 has a scraping edge 6243 at one end close to the inner wall of the spherical nozzle 623, and the scraping edge 6243 is arc-shaped and matches the curvature of the inner wall of the spherical nozzle 623. During the cement filling, when the driving member drives the cleaning member 6242 to rotate around the fixing member 6241, the scraping edge 6243 closely fits the curved surface of the inner wall of the spherical nozzle 623 for cleaning, thereby preventing the cement material from clogging the grouting hole 6231 to ensure the normal operation of the spherical nozzle 623.

[0055] The following is a specific example to illustrate the present open-pit mine end wall goaf cementing dry integrated filling method:

[0056] Step 1: construct filling holes in the top plate of the goaf;

[0057] Specifically, the radius of the filling borehole is 200 mm;

[0058] Step 2: Open the valve on the conveying pipeline to allow the cement, coal gangue and water reducing agent in the gel material silo 100, the aggregate silo 200 and the additive silo 300 to enter the mixing device 500. At the same time, the waste gangue is put into the crushing device. The crushed gangue forms a solid filling material with a particle size of 30 mm. The solid filling material is transported by the conveyor belt through the feeding pipe 621 set on the filling borehole to enter the goaf for dry filling.

[0059] Specifically, the radius of the feeding pipe 621 is 180 mm;

[0060] Step 3: Start the mixing device 500 to fully stir and mix the cement, coal gangue and water reducing agent in the mixing device 500 to form a cementitious material;

[0061] Step 4: The mixing device 500 delivers the mixed cementing material to the first cavity 614 of the slurry storage tank 611, and the air pump 617 extracts the air in the first cavity 614 to form an internal and external pressure difference, so that the slider 616 slides downward with the piston assembly 612 until the slider 616 abuts against the blocking portion 6111, and the cementing material in the first cavity 614 is compressed and output to the grouting pipe 622, and the slider 616 is separated from the first piston 6121 under the obstruction of the blocking portion 6111, and the first cavity 614 is connected to the outside air to eliminate the pressure difference, and the piston assembly 612 is pressed under the spring. The grouting pipe 622 transports the cementitious material to the spherical nozzle 623 in the goaf and fills the goaf in a jet shape at the top of the goaf. At the same time, the cleaning component 624 operates synchronously with the cementitious filling. The driving member drives the cleaning member 6242 to rotate around the fixing member 6241. The scraping edge 6243 on the cleaning member 6242 fits tightly against the curved surface of the inner wall of the spherical nozzle 623 for cleaning to prevent the grouting hole 6231 from being blocked by the cementitious material until the goaf is completely filled, thereby realizing the simultaneous cementitious filling and dry filling and improving work efficiency.

[0062] Specifically, the radius of the grouting pipe 622 is 50 mm.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for cementing dry integrated filling of the goaf area of ​​an open-pit mine, characterized in that: include: Step 1: construct filling holes in the top plate of the goaf; Step 2: opening the gel material bin (100), the aggregate bin (200) and the additive bin (300) to allow different cementing raw materials to enter the mixing device (500), and simultaneously starting the solid feeding device (400) to allow the solid filling material to enter the goaf through the filling borehole for dry filling; Step three: starting the mixing device (500) to allow the gel material, aggregate and additive to be fully mixed in the mixing device (500) to form a cementitious material; Step 4: the mixing device (500) transports the mixed cementing material to the filling device (600), and the filling device (600) transports the cementing material to the goaf and performs jet filling at the top of the goaf, so that the cementing filling and dry filling are performed simultaneously until the goaf is completely filled; The filling device (600) comprises a slurry storage mechanism (610) and a filling mechanism (620), wherein the input end of the slurry storage mechanism (610) is connected to the output end of the mixing device (500), and the input end of the filling mechanism (620) is connected to the output end of the slurry storage mechanism (610), and the slurry storage mechanism (610) is used to store cementitious material and apply pressure to the cementitious material so that the filling mechanism (620) performs jet cementitious filling at the top of the goaf; The filling mechanism (620) comprises: A feeding pipe (621), the feeding pipe (621) is arranged in the filling borehole to guide the crushed solid filling material into the goaf; A grouting pipe (622), the input end of the grouting pipe (622) being in communication with the output end of the grouting storage mechanism (610), the grouting pipe (622) being arranged in the feeding pipe (621), and the grouting pipe (622) being used for transporting cementitious materials; A spherical nozzle (623), the spherical nozzle (623) being arranged at the output end of the grouting pipe (622), and a plurality of grouting holes (6231) being evenly formed on the spherical nozzle (623).

2. The method for cementing dry integrated filling of the open-pit mine end wall goaf according to claim 1 is characterized in that: In step 2, the solid material feeding device (400) comprises: A crushing mechanism (410), wherein the crushing mechanism (410) is used to crush coal waste to provide solid filling material; A transport mechanism (420), wherein an input end of the transport mechanism (420) is connected to an output end of the crushing mechanism (410), and the transport mechanism (420) is used to transport solid filling materials to the filling device (600).

3. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 1 is characterized in that: In step three, water is injected into the mixing device (500) through a water inlet pipe (510); a water flow meter (511) is provided on the water inlet pipe (510); the water flow meter (511) is used to control the amount of water entering the mixing device (500).

4. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 1 is characterized in that: The slurry storage mechanism (610) comprises: A slurry storage tank (611), wherein a blocking portion (6111) is provided on a tank wall of the slurry storage tank (611); A piston assembly (612), wherein the piston assembly (612) is slidably disposed in the slurry storage tank (611) via a slider (616), the slider (616) corresponds to the blocking portion (6111), the piston assembly (612) is connected to the tank wall of the slurry storage tank (611) via an elastic member (613), the piston assembly (612) has a first cavity (614), the piston assembly (612) and the slurry storage tank (611) are enclosed to form a second cavity (615), the first cavity (614) and the second cavity (615) are in communication, and the second cavity (615) is used to store a cementitious material; An air pump (617) is connected to the first cavity (614). The air pump (617) extracts air from the first cavity (614), causing the piston assembly (612) to move in a direction of reducing the volume of the second cavity (615), and presses the adhesive material in the second cavity (615) into the filling device (600). When the slider (616) abuts against the blocking portion (6111), the piston assembly (612) is separated from the slider (616) and continues to move in a direction of reducing the volume of the second cavity (615) until the first cavity (614) is connected to the outside air, and the piston assembly (612) is reset under the action of the elastic member (613).

5. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 1 is characterized in that: In step four, the filling device (600) further comprises a cleaning component (624), wherein the cleaning component (624) is located in the spherical nozzle (623). During cement filling, the cleaning component (624) cleans the spherical nozzle (623) to prevent the cement material from clogging the grouting hole (6231).

6. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 5 is characterized in that: The cleaning component (624) includes: A fixing member (6241), wherein the fixing member (6241) is arranged in the spherical nozzle (623), and the fixing member (6241) is located on the radius of the spherical nozzle (623); A cleaning member (6242) is rotatably disposed on the fixing member (6241), and the cleaning member (6242) has a scraping edge (6243) that matches the curvature of the inner wall of the spherical nozzle (623). The cleaning member (6242) is rotated around the fixing member (6241) so that the cleaning member (6242) can remove the cementitious material that is blocked in the grouting hole (6231).

7. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 1 is characterized in that: The discharge port of the feeding pipe (621) is flush with the top plate of the goaf.

8. The method for cementing dry integrated filling of open-pit mine end wall goaf according to claim 1 is characterized in that: The aggregate particle size in the aggregate silo ranges from 6 mm to 10 mm, and the particle size of the solid filling material ranges from 20 mm to 40 mm.

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