A circulating filling system and method for waste rock quarry in underground metal mines

Abstract

A system and method for circulating filling in a waste rock quarry in a metal mine. The system includes a waste rock crushing subsystem, a waste rock transportation subsystem, and a waste rock filling subsystem. Waste rock discharged from the waste rock chute outlet enters the waste rock crushing subsystem for crushing. The crushed waste rock is then transferred to the waste rock filling subsystem via the waste rock transportation subsystem. Waste rock filling is performed within the quarry by the waste rock filling subsystem. The method comprises: dividing the ore vein into layers, and performing maintenance and filling while mining. The waste rock in the quarry is crushed, and the crushed waste rock is transported by waste rock mining vehicles to segmented connecting tunnels. The waste rock is then discharged into the quarry filling hopper via a retractable belt-type transport device. The filling hopper leaks material at a constant speed and slides at a constant speed along a height difference track from the upper end to the lower end under the potential energy of gravity. During the sliding process, waste rock is filled by leaking material. After the filling hopper slides to the lower end, the waste rock inside is simultaneously emptied. The empty filling hopper is transferred back to the upper end of the height difference track by a lifting grab bucket for reloading, thus achieving circulating filling.

Description

Technical Field

[0001] The present invention belongs to the technical field of mining engineering, and in particular relates to a circulating filling system and method for a waste rock quarry in a metal mine. Background Art

[0002] In the traditional mining process of metal deposits, it is usually necessary to lift the ore and waste rock to the surface separately. The ore enters the mineral processing plant for mineral extraction, and the waste rock is directly piled on the surface. Especially for deposits with low grade or large development projects, a large amount of waste rock will be accumulated, which will not only occupy a large amount of surface resources, seriously pollute the soil, and cause a waste of land resources, but also create huge safety hazards and seriously threaten personnel safety.

[0003] To reduce the storage and discharge of waste rock, waste rock filling technology has emerged. First, mining waste rock needs to be mechanically crushed on the surface to a certain particle size. The crushed waste rock is then transported by conveyor belts, trucks, and other means. Finally, the crushed waste rock is filled into the goaf or other spaces to achieve the purpose of waste rock recovery and utilization.

[0004] Although traditional waste rock filling technology can solve the problems of waste rock waste and surface accumulation, it also has some problems and limitations, as follows:

[0005] ① A large amount of waste rock is usually only mechanically crushed once on the surface, which inevitably leads to problems such as a high rate of large crushed rocks and uneven particle size distribution. When these waste rocks are used for filling, there are large gaps in the waste rock filling and low strength of the filling body, which is also prone to cause clogging of the filling well;

[0006] ② A large amount of waste rock needs to be crushed from the surface and then filled into the goaf through the filling shaft. When the ore deposit is buried deep, the transportation of waste rock will be difficult and inefficient, and the construction of the filling shaft will be difficult and costly. Due to the large height of the filling shaft, the waste rock will easily damage the shaft wall during the process of falling into the shaft, and the filling shaft will be difficult to maintain.

[0007] ③. When the goaf is large, since the waste rock filling is dry filling, its fluidity is poor, which can easily cause lagging blockage, and the leveling in a mining area is poor. The gaps around the mine room after waste rock filling are large, which will lead to uneven strength of the filling body and affect the safety and stability of the mine.

[0008] ④. The filling body of traditional dry filling is raked flat by an electric rake. During the electric rake operation, the filling body needs to be raked flat by reciprocating operations in the mine room. The electric rake also takes a long time to complete loading and unloading. Not only is the power consumption high, but the work efficiency is relatively low. Summary of the Invention

[0009] In response to the problems existing in the prior art, the present invention provides a system and method for circulating and filling waste rock in underground metal mines, which eliminates the need to transport waste rock outward. While the ore is being mined, the waste rock is crushed, transported and filled underground. The waste rock filling abandons the electric rake leveling method and uses height-difference tracks and gravitational potential energy to achieve uniform material discharge, greatly improving the filling efficiency, leveling and compactness, and effectively reducing the filling cost.

[0010] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a circulating filling system in a waste rock quarry in a metal mine, comprising a waste rock crushing subsystem, a waste rock transportation subsystem and a waste rock filling subsystem; the waste rock crushing subsystem is located at the outlet of the waste rock chute in the quarry; the waste rock transportation subsystem is located in the ore-discharging through-vein tunnel, the stage transportation tunnel, the ore-discharging hoisting shaft and the segmented connecting tunnel; the waste rock filling subsystem is located in the quarry; the waste rock discharged from the outlet of the waste rock chute in the quarry enters the waste rock crushing subsystem for crushing, and the crushed waste rock is transferred to the waste rock filling subsystem via the waste rock transportation subsystem, and the waste rock is filled in the quarry through the waste rock filling subsystem.

[0011] The waste rock crushing subsystem includes a bucket elevator, a crusher and a vibrating screen; the feed port of the bucket elevator is used to load the waste rock discharged from the outlet of the waste rock chute in the mining area, the discharge port of the bucket elevator is connected to the feed port of the crusher, the discharge port of the crusher is connected to the feed port of the vibrating screen, the under-screen outlet of the vibrating screen is used to output waste rock with a particle size that meets the standard, and the over-screen outlet of the vibrating screen is used to output waste rock with a particle size that exceeds the standard. The waste rock with a particle size that exceeds the standard needs to be returned to the crusher for secondary crushing.

[0012] The bucket elevator, crusher and vibrating screen are fixedly mounted on the same wheeled base, which shares a mine car track with the underground mine car. The bucket elevator, crusher and vibrating screen are transferred and moved on the mine car track via the wheeled base.

[0013] The waste rock transportation subsystem includes a waste rock mine car, a mine car hoisting device and a retractable belt transport device; the waste rock mine car is used to load waste rock with a particle size standard output from the under-screen outlet of the vibrating screening machine; the mine car hoisting device is located in the mine discharge hoisting shaft; the waste rock mine car moves toward the mine discharge hoisting shaft through the mine car track in the mine discharge through-vein tunnel and the stage transport tunnel, and the waste rock mine car enters the segmented connecting tunnel from the mine discharge hoisting shaft through the mine car hoisting device; the retractable belt transport device is located in the segmented connecting tunnel, the feeding end of the retractable belt transport device is used to load the waste rock with a particle size standard unloaded by the waste rock mine car, and the discharging end of the retractable belt transport device is used to input waste rock with a particle size standard into the waste rock filling subsystem.

[0014] The chassis of the waste rock mine car is provided with a discharge port, and a discharge door panel is provided at the discharge port. The discharge door panel is closed before the waste rock is discharged. When the waste rock needs to be unloaded to the feed end of the retractable belt transport device, the waste rock is unloaded by opening the discharge door panel.

[0015] The waste rock filling subsystem includes a lifting grab, a filling bucket and a height difference track; the lifting grab is located above the mining site; the height difference track is located in the mining site, and the lower and upper ends of the height difference track are located side by side below the lifting grab; the filling bucket is mounted on the height difference track, and is used to load waste rock unloaded from the discharge end of the retractable belt transport device. The filling bucket automatically moves from the upper end of the height difference track to the lower end of the height difference track by relying on the potential energy of gravity, and the filling bucket is transferred from the lower end of the height difference track to the high end of the height difference track through the lifting grab.

[0016] The filling hopper adopts a cylindrical structure, the bottom end of the filling hopper is a discharge port and adopts a constricted structure, a hydraulic gate valve is provided at the discharge port of the filling hopper, and the leakage speed of the waste rock is controlled by the hydraulic gate valve.

[0017] The main body of the height difference track is a high-rigidity cable, and the filling bucket is hung on the high-rigidity cable through a cable pulley, and the slopes in all sections of the high-rigidity cable are consistent.

[0018] When installing the high-rigidity cable, it is necessary to drill holes at both ends of the mine room in the goaf to fix it, and then tighten the high-rigidity cable through a winch; if the mining area is long, a temporary relay tower can be erected in the mining area, and then the high-rigidity cable can be extended to the other end of the mining area.

[0019] A method for circulating and filling waste rock in a metal mine, which adopts the above-mentioned system for circulating and filling waste rock in a metal mine, comprises the following steps:

[0020] Step 1: Divide the vein into layers. Based on the geological conditions and mining process requirements, the vein is first divided into several segments along its strike, and each segment is then divided into several layers. The height difference between adjacent layers is controlled to be 2 to 3 meters. Mining is carried out from bottom to top perpendicular to the vein strike from the stope boundary, with pillars left between adjacent stopes. The length of each stope is controlled to be 30 to 50 meters. During the mining process, maintenance and backfilling are carried out simultaneously to control the roof height to no more than 3 meters.

[0021] Step 2: During the construction and mining process of the mining project, the waste rock generated is discharged from the waste rock chute in the quarry. The discharged waste rock is first sent to the bucket elevator, and the bucket elevator sends the waste rock to the crusher. The crusher crushes the large waste rock and sends the crushed waste rock to the vibrating screen. The waste rock under the vibrating screen is the waste rock with the particle size that meets the standard, and the waste rock on the vibrating screen is the waste rock with the particle size that exceeds the standard. The waste rock with the particle size that exceeds the standard needs to be sent back to the crusher for secondary crushing until the waste rock particle size meets the standard.

[0022] Step 3: The crushed waste rock with excessive particle size is loaded into the waste rock mine car, transferred along the underground mine car track to the mine hoisting shaft, and then enters the car of the mine car hoisting device. The mine car hoisting device then lifts the waste rock mine car loaded with waste rock to the segmented connecting tunnel for filling;

[0023] Step 4: Move the waste rock mine car loaded with waste rock to the top of the feed end of the retractable belt conveyor, then open the unloading door panel at the bottom of the waste rock mine car to unload the waste rock in the waste rock mine car through the bottom unloading port onto the retractable belt conveyor;

[0024] Step 5: The waste rock is transported to an empty filling bucket through the discharge end of the retractable belt conveyor, and the empty filling bucket is grabbed and fixed by the lifting grab;

[0025] Step 6: When the empty filling bucket is filled with waste rock, the filling bucket loaded with waste rock is moved to the high end of the height difference track by lifting the grab bucket, and is hung on the high end of the height difference track by the rope pulley. Then, the lifting grab bucket is controlled to release the filling bucket, and the hydraulic gate valve at the discharge port at the bottom of the filling bucket is opened at the same time to achieve uniform material discharge;

[0026] Step 7: Under the action of gravitational potential energy, the filling bucket will slide at a constant speed from the high end to the low end along the height difference track. During the sliding process, the waste rock will be evenly filled by leaking material. When the filling bucket slides to the low end of the height difference track, the waste rock inside the filling bucket will be emptied synchronously.

[0027] Step 8: Restart the lifting grab bucket, grab the empty filling bucket through the lifting grab bucket, and move it to the bottom of the discharge end of the retractable belt conveyor, and transport the waste rock to the empty filling bucket through the discharge end of the retractable belt conveyor again;

[0028] Step 9: When the empty filling bucket is filled with waste rock again, the filling bucket loaded with waste rock is moved to the high end of the height difference track by lifting the grab bucket again, thereby completing a cycle of filling;

[0029] Step 10: Repeat the filling process until the waste rock fills the entire mine room;

[0030] Step 11: When the filling of a mining area is completed, the equipment in the waste rock filling subsystem is first recovered, and then based on the layered working space, a new working surface is obtained by blasting the falling ore, and then the mining and filling cycle is carried out based on the filling body. During the mining and filling process, cementing materials need to be used to reinforce the top and bottom plates to prevent falling.

[0031] Beneficial effects of the present invention:

[0032] The circulating filling system and method for the waste rock quarry in the metal mine of the present invention adopts a layered filling method and does not need to build a filling skylight that runs through the entire ore bed. It not only reduces the amount of development engineering, but also can effectively reduce the drop of ore during filling, avoids damage to the shaft wall, and can be flexibly adjusted according to the characteristics of the ore bed and the filling requirements, thereby improving the efficiency and quality of filling.

[0033] The metal mine underground waste rock quarry internal circulation filling system and method of the present invention adopts a mining and filling method, eliminating the waste rock transportation link. While the ore is being mined, the waste rock is crushed, transported and filled underground, avoiding large-scale accumulation of waste rock and reducing the cost of waste rock treatment. At the same time, it can also greatly reduce the area of ​​the goaf and reduce the risk of roof collapse during mining.

[0034] The circulating filling system and method for waste rock quarry in metal mines of the present invention are particularly suitable for lower-grade ore deposits because these ore deposits have a higher proportion of waste rock. By adopting a mining and filling method, the waste of waste rock and the impact on the environment can be greatly reduced.

[0035] The circulating filling system and method for waste rock quarry in underground metal mines of the present invention adopts a circulating continuous filling mode, delays material dropping during the filling process, and the entire filling process is carried out uninterruptedly, thereby greatly improving the filling efficiency.

[0036] The circulating filling system and method for waste rock quarry in an underground metal mine of the present invention can ensure that the entire goaf area mine room receives materials evenly, avoid excessive concentration of waste rock during the filling process, and prevent blockage or poor flow. At the same time, it can also make the gaps around the mine room after filling more uniform, thereby improving the leveling and tightness of the filling.

[0037] The circulating filling system and method for waste rock quarry in underground metal mines of the present invention abandons the electric rake leveling method for waste rock filling, realizes uniform material discharge by means of height difference tracks and gravitational potential energy, and effectively reduces energy consumption in the waste rock filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a circulating filling system in a waste rock quarry in a metal mine according to the present invention;

[0039] Figure 2 for Figure 1 Enlarged view of middle part I;

[0040] Figure 3 for Figure 1 Middle A-direction view;

[0041] Figure 4 Schematic diagram of the waste rock recycling filling in the filling hopper in the stope;

[0042] Figure 5 Exploded diagram of the process of filling the filling bucket with waste rock in the stope;

[0043] In the figure, 1 is the waste rock chute in the mine, 2 is the mine-discharging through-vein tunnel, 3 is the stage transport tunnel, 4 is the mine-discharging hoisting shaft, 5 is the segmented connecting tunnel, 6 is the mine, 7 is the bucket elevator, 8 is the crusher, 9 is the vibrating screen, 10 is the waste rock mine car, 11 is the mine car hoisting device, 12 is the retractable belt transport device, 13 is the hoisting grab, 14 is the filling bucket, 15 is the height difference track, 16 is the waste rock, and 17 is the pillar. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figures 1 to 5 As shown, a circulating filling system in a waste rock quarry in a metal mine includes a waste rock crushing subsystem, a waste rock transportation subsystem and a waste rock filling subsystem; the waste rock crushing subsystem is located at the outlet of the waste rock chute 1 in the quarry; the waste rock transportation subsystem is located in the ore-discharging through-vein tunnel 2, the stage transportation tunnel 3, the ore-discharging hoisting shaft 4 and the segmented connecting tunnel 5; the waste rock filling subsystem is located in the quarry 6; the waste rock 16 discharged from the outlet of the waste rock chute 1 in the quarry enters the waste rock crushing subsystem for crushing, and the crushed waste rock is transferred to the waste rock filling subsystem via the waste rock transportation subsystem, and is filled with waste rock in the quarry 6 through the waste rock filling subsystem.

[0046] The waste rock crushing subsystem includes a bucket elevator 7, a crusher 8 and a vibrating screen 9; the feed port of the bucket elevator 7 is used to load the waste rock discharged from the outlet of the waste rock chute 1 in the mining area, the discharge port of the bucket elevator 7 is connected to the feed port of the crusher 8, and the discharge port of the crusher 8 is connected to the feed port of the vibrating screen 9. The under-screen outlet of the vibrating screen 9 is used to output waste rock with a particle size that meets the standard, and the over-screen outlet of the vibrating screen 9 is used to output waste rock with a particle size that exceeds the standard. The waste rock with a particle size that exceeds the standard needs to be returned to the crusher 8 for secondary crushing.

[0047] The bucket elevator 6, crusher 7 and vibrating screen 8 are fixedly mounted on the same wheeled base, which shares the mine car track with the underground mine car. The bucket elevator 6, crusher 7 and vibrating screen 8 are transferred and moved on the mine car track through the wheeled base.

[0048] The waste rock transportation subsystem includes a waste rock mine car 10, a mine car hoisting device 11 and a retractable belt conveyor 12; the waste rock mine car 10 is used to load waste rock with a particle size standard output from the under-screen outlet of the vibrating screening machine 8; the mine car hoisting device 11 is located in the mine discharge hoisting shaft 4; the waste rock mine car 10 moves toward the mine discharge hoisting shaft 4 through the mine car track in the mine discharge through-vein tunnel 2 and the stage transport tunnel 3, and the waste rock mine car 10 enters the segmented connecting tunnel 5 from the mine discharge hoisting shaft 4 through the mine car hoisting device 11; the retractable belt conveyor 12 is located in the segmented connecting tunnel 5, the feeding end of the retractable belt conveyor 12 is used to load the waste rock with a particle size standard unloaded by the waste rock mine car 10, and the discharging end of the retractable belt conveyor 12 is used to input waste rock with a particle size standard into the waste rock filling subsystem.

[0049] The chassis of the waste rock mine car 10 is provided with a discharge port, and a discharge door panel is provided at the discharge port. The discharge door panel is closed before the waste rock is discharged. When the waste rock needs to be unloaded to the feed end of the retractable belt transport device 12, the waste rock is unloaded by opening the discharge door panel.

[0050] The waste rock filling subsystem includes a lifting grab 13, a filling bucket 14 and a height difference track 15; the lifting grab 13 is located above the mining site entrance; the height difference track 15 is located in the mining site 6, and the lower end and the upper end of the height difference track 15 are located side by side below the lifting grab 13; the filling bucket 14 is hung on the height difference track 15, and the filling bucket 14 is used to load the waste rock unloaded from the discharge end of the retractable belt conveyor 12. The filling bucket 14 automatically moves from the high end of the height difference track 15 to the low end of the height difference track 15 by relying on the potential energy of gravity. The filling bucket 14 is transferred from the low end of the height difference track 15 to the high end of the height difference track 13 through the lifting grab 13.

[0051] The filling hopper 12 adopts a cylindrical structure, the bottom end of the filling hopper 12 is a discharge port and adopts a constricted structure. A hydraulic gate valve is provided at the discharge port of the filling hopper 12 to control the leakage speed of the waste rock.

[0052] The main body of the height difference track 13 is a high-rigidity cable, and the filling bucket 12 is hung on the high-rigidity cable through a cable pulley, and the slopes of all sections of the high-rigidity cable are consistent.

[0053] When installing the high-rigidity cable, it is necessary to drill holes at both ends of the mine room in the goaf and fix them, and then tighten the high-rigidity cable through a winch; if the mining area 6 is long, a temporary relay tower can be erected in the mining area 6, and then the high-rigidity cable can be extended to the other end of the mining area 6.

[0054] A method for circulating and filling waste rock in a metal mine, which adopts the above-mentioned system for circulating and filling waste rock in a metal mine, comprises the following steps:

[0055] Step 1: Divide the ore vein into layers. Based on the geological conditions and the requirements of the mining process, the ore vein is first divided into several segments along its strike, and each segment is then divided into several layers. The height difference between adjacent layers is controlled to be 2 to 3 meters. Mining is carried out from the boundary of stope 6 perpendicular to the strike of the ore vein from bottom to top. Pillars 17 are left between adjacent stopes 6. The length of each stope is controlled to be 30 to 50 meters. During the mining process, maintenance and backfilling are carried out while mining is being carried out, and the roof height is controlled to be no more than 3 meters.

[0056] Step 2: During the construction and mining process of the mining project, the waste rock 16 generated is discharged from the waste rock chute 1 in the mining area. The discharged waste rock 16 is first sent to the bucket elevator 6, and the bucket elevator 6 sends the waste rock 16 to the crusher 7. The large pieces of waste rock 16 are crushed by the crusher 7. The crushed waste rock 16 is sent to the vibrating screen 8. The waste rock 16 with a particle size that meets the standard is output under the vibrating screen 9. The waste rock 16 with a particle size that exceeds the standard is output on the vibrating screen 9. The waste rock 16 with a particle size that exceeds the standard needs to be sent back to the crusher 8 for secondary crushing until the waste rock 16 has a particle size that meets the standard.

[0057] Step 3: The crushed waste rock 16 with excessive particle size is loaded into the waste rock mine car 10, transferred along the underground mine car track to the mine hoist shaft 4, and then enters the car of the mine car hoisting device 11. The mine car hoisting device 11 then lifts the waste rock mine car 10 loaded with waste rock 16 to the segmented connecting tunnel 5 for filling;

[0058] Step 4: Move the waste rock mine car 10 loaded with waste rock 16 to the top of the feed end of the retractable belt conveyor 12, then open the unloading door panel at the bottom of the waste rock mine car 10 to unload the waste rock in the waste rock mine car 10 through the bottom unloading port onto the retractable belt conveyor 12;

[0059] Step 5: The waste rock 16 is transported to the empty filling bucket 14 through the discharge end of the retractable belt conveyor 12, and the empty filling bucket 14 is grabbed and fixed by the lifting grab 13;

[0060] Step 6: When the empty filling bucket 14 is filled with waste rock 16, the filling bucket 14 loaded with waste rock 16 is moved to the high end of the height difference track 15 by lifting the grab bucket 13 and is hung on the high end of the height difference track 15 by the grab pulley. Then, the lifting grab bucket 13 is controlled to release the filling bucket 14, and at the same time, the hydraulic gate valve at the discharge port at the bottom end of the filling bucket 14 is opened to achieve uniform material discharge;

[0061] Step 7: Under the action of gravitational potential energy, the filling hopper 14 will slide at a constant speed from the high end to the low end along the height difference track 15. During the sliding process, the waste rock is evenly filled by leaking material. When the filling hopper 14 slides to the low end of the height difference track 15, the waste rock inside the filling hopper 14 is simultaneously emptied.

[0062] Step 8: Restart the lifting grab bucket 13, grab the empty filling bucket 14 through the lifting grab bucket 13, and move it to the bottom of the discharge end of the retractable belt conveyor 12, and transport the waste rock 16 to the empty filling bucket 14 through the discharge end of the retractable belt conveyor 12 again;

[0063] Step 9: After the empty filling bucket 14 is refilled with waste rock 16, the filling bucket 14 loaded with waste rock 16 is moved to the high end of the height difference track 15 by lifting the grab bucket 13 again, thereby completing one cycle of filling;

[0064] Step 10: Repeat the cyclic filling process until the waste rock 16 fills the entire mine room;

[0065] Step 11: When the filling of a mining area 6 is completed, the equipment in the waste rock filling subsystem is first recovered, and then based on the layered working space, a new working surface is obtained by blasting the falling ore, and then the mining and filling cycle is carried out based on the filling body. During the mining and filling process, cementing materials need to be used to reinforce the top and bottom plates to prevent falling.

[0066] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention is included in the patent scope of this case.

Claims

1. A circulating filling system for waste rock quarry in a metal mine, characterized by: It includes a waste rock crushing subsystem, a waste rock transportation subsystem and a waste rock filling subsystem; the waste rock crushing subsystem is located at the outlet of the waste rock chute in the mine; the waste rock transportation subsystem is located in the mine-exit through-vein tunnel, stage transportation tunnel, mine-exit hoisting shaft and segmented connecting tunnel; the waste rock filling subsystem is located in the mine; the waste rock discharged from the outlet of the waste rock chute in the mine enters the waste rock crushing subsystem for crushing, and the crushed waste rock is transferred to the waste rock filling subsystem via the waste rock transportation subsystem, and is then filled in the mine by the waste rock filling subsystem; The waste rock crushing subsystem includes a bucket elevator, a crusher, and a vibrating screen. The feed port of the bucket elevator is used to load waste rock discharged from the waste rock chute outlet of the mine. The discharge port of the bucket elevator is connected to the feed port of the crusher, and the discharge port of the crusher is connected to the feed port of the vibrating screen. The under-screen outlet of the vibrating screen is used to output waste rock with a particle size that meets the standard. The over-screen outlet of the vibrating screen is used to output waste rock with a particle size that exceeds the standard. The waste rock with a particle size that exceeds the standard needs to be returned to the crusher for secondary crushing. The waste rock transportation subsystem includes a waste rock mine car, a mine car hoisting device and a retractable belt conveyor; the waste rock mine car is used to load waste rock with a particle size standard output from the under-screen outlet of the vibrating screening machine; the mine car hoisting device is located in the mine discharge hoisting shaft; the waste rock mine car moves toward the mine discharge hoisting shaft through the mine car track in the mine discharge through-vein lane and the stage transport lane, and the waste rock mine car enters the segmented connecting lane from the mine discharge hoisting shaft through the mine car hoisting device; the retractable belt conveyor is located in the segmented connecting lane, the feeding end of the retractable belt conveyor is used to load the waste rock with a particle size standard unloaded by the waste rock mine car, and the discharging end of the retractable belt conveyor is used to input the waste rock with a particle size standard into the waste rock filling subsystem; The waste rock filling subsystem includes a lifting grab, a filling bucket and a height difference track; the lifting grab is located above the mining site; the height difference track is located in the mining site, and the lower end and the upper end of the height difference track are located side by side below the lifting grab; the filling bucket is mounted on the height difference track, and the filling bucket is used to load waste rock unloaded from the discharge end of the retractable belt transport device, and the filling bucket automatically moves from the high end of the height difference track to the low end of the height difference track by relying on the potential energy of gravity, and the filling bucket is transferred from the low end of the height difference track to the high end of the height difference track through the lifting grab; the filling bucket adopts a cylindrical structure, and the bottom end of the filling bucket is a discharge port and adopts a contraction structure. A hydraulic gate valve is provided at the discharge port of the filling bucket, and the leakage speed of the waste rock is controlled by the hydraulic gate valve.

2. The internal circulation filling system for waste rock quarry in a metal mine according to claim 1, characterized in that: The bucket elevator, crusher and vibrating screen are fixedly mounted on the same wheeled base, which shares a mine car track with the underground mine car. The bucket elevator, crusher and vibrating screen are transferred and moved on the mine car track via the wheeled base.

3. The internal circulation filling system for waste rock quarry in a metal mine according to claim 1, characterized in that: The chassis of the waste rock mine car is provided with a discharge port, and a discharge door panel is provided at the discharge port. The discharge door panel is closed before the waste rock is discharged. When the waste rock needs to be unloaded to the feed end of the retractable belt transport device, the waste rock is unloaded by opening the discharge door panel.

4. The internal circulation filling system for waste rock quarry in a metal mine according to claim 1, characterized in that: The main body of the height difference track is a high-rigidity cable, and the filling bucket is hung on the high-rigidity cable through a cable pulley, and the slopes in all sections of the high-rigidity cable are consistent.

5. The internal circulation filling system for waste rock quarry in a metal mine according to claim 4, characterized in that: When installing the high-rigidity cable, it is necessary to drill holes at both ends of the mine room in the goaf to fix it, and then tighten the high-rigidity cable through a winch; if the mining area is long, a temporary relay tower can be erected in the mining area, and then the high-rigidity cable can be extended to the other end of the mining area.

6. A method for internal circulation filling of waste rock quarries in metal mines, which adopts the internal circulation filling system of waste rock quarries in metal mines according to claim 1, characterized in that The steps include: Step 1: Divide the vein into layers. Based on the geological conditions and mining process requirements, the vein is first divided into several segments along its strike, and each segment is then divided into several layers. The height difference between adjacent layers is controlled to be 2 to 3 meters. Mining is carried out from bottom to top perpendicular to the vein strike from the stope boundary, with pillars left between adjacent stopes. The length of each stope is controlled to be 30 to 50 meters. During the mining process, maintenance and backfilling are carried out simultaneously to control the roof height to no more than 3 meters. Step 2: During the construction and mining process of the mining project, the waste rock generated is discharged from the waste rock chute in the quarry. The discharged waste rock is first sent to the bucket elevator, and the bucket elevator sends the waste rock to the crusher. The crusher crushes the large waste rock and sends the crushed waste rock to the vibrating screen. The waste rock under the vibrating screen is the waste rock with the particle size that meets the standard, and the waste rock on the vibrating screen is the waste rock with the particle size that exceeds the standard. The waste rock with the particle size that exceeds the standard needs to be sent back to the crusher for secondary crushing until the waste rock particle size meets the standard. Step 3: The crushed waste rock that meets the particle size standard is loaded into the waste rock mine car, transferred along the underground mine car track to the mine hoisting shaft, and then enters the car of the mine car hoisting device. The mine car hoisting device then lifts the waste rock mine car loaded with waste rock to the segmented connecting tunnel for filling; Step 4: Move the waste rock mine car loaded with waste rock to the top of the feed end of the retractable belt conveyor, then open the unloading door panel at the bottom of the waste rock mine car to unload the waste rock in the waste rock mine car through the bottom unloading port onto the retractable belt conveyor; Step 5: The waste rock is transported to an empty filling bucket through the discharge end of the retractable belt conveyor, and the empty filling bucket is grabbed and fixed by the lifting grab; Step 6: When the empty filling bucket is filled with waste rock, the filling bucket loaded with waste rock is moved to the high end of the height difference track by lifting the grab bucket, and is hung on the high end of the height difference track by the rope pulley. Then, the lifting grab bucket is controlled to release the filling bucket, and the hydraulic gate valve at the discharge port at the bottom of the filling bucket is opened at the same time to achieve uniform material discharge; Step 7: Under the action of gravitational potential energy, the filling bucket will slide at a constant speed from the high end to the low end along the height difference track. During the sliding process, the waste rock will be evenly filled by leaking material. When the filling bucket slides to the low end of the height difference track, the waste rock inside the filling bucket will be emptied synchronously. Step 8: Restart the lifting grab bucket, grab the empty filling bucket through the lifting grab bucket, and move it to the bottom of the discharge end of the retractable belt conveyor, and transport the waste rock to the empty filling bucket through the discharge end of the retractable belt conveyor again; Step 9: When the empty filling bucket is filled with waste rock again, the filling bucket loaded with waste rock is moved to the high end of the height difference track by lifting the grab bucket again, thereby completing a cycle of filling; Step 10: Repeat the filling process until the waste rock fills the entire mine room; Step 11: When the filling of a mining area is completed, the equipment in the waste rock filling subsystem is first recovered, and then based on the layered working space, a new working surface is obtained by blasting the falling ore, and then the mining and filling cycle is carried out based on the filling body. During the mining and filling process, cementing materials need to be used to reinforce the top and bottom plates to prevent falling.

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