A gangue collaborative filling system based on flexible shield support and rope saw coal mining

Abstract

The utility model discloses a gangue collaborative filling system based on flexible shield support and rope saw coal mining belongs to coal seam mining technical field. Including flexible shield support, it has the front side of facing operation space and opposite back, the back faces the goaf of outside, gangue filling system, it includes the scraper conveyor that a plurality of support legs are established at the body bottom, the scraper conveyor is through the support leg and is supported in the floor plate lane of outside, and is anchored to the bottom of floor plate lane through the support leg, and the scraper conveyor's scraper machine head is equipped with the gangue chute that inclines downward, and the discharge end of gangue chute is suitable for extending to the goaf above the back of flexible shield support. The utility model constructs " mining - support - fills " structure collaborative closed loop, and effectively reduces the risk of roof suspension and support instability.

Description

Technical Field

[0001] This utility model belongs to the field of coal seam mining technology, and in particular relates to a gangue co-filling system based on flexible shield support and wire saw mining. Background Technology

[0002] Steeply inclined coal seams and inclined coal seams have always been challenging to mine due to their large dip angles and complex occurrence conditions. Traditional flexible shield supports combined with pneumatic picks for coal extraction suffer from high labor intensity and severe dust and noise pollution.

[0003] To address the shortcomings of manual coal cutting, existing technologies (such as Chinese patent ZL202610039309.4) have proposed a wire saw mining device for steeply inclined coal seams. This device arranges flexible shield supports at the working face to isolate the goaf, and uses diamond wire saws to replace pneumatic picks for coal seam cutting below the supports.

[0004] While this solution mechanizes the cutting process, it has a technological blind spot: a complete lack of follow-up treatment for the goaf. In existing wire saw mining systems, the goaf created after wire saw cutting is directly suspended in the air, and the flexible support can only passively rely on its own weight or the natural collapse of the overlying roof rock for support. This "mining without replenishment" model leads to the following serious consequences: Uneven stress on the support: Without uniform filling material coverage, the flexible shield support is prone to tilting, jamming, or even overturning during the lowering process; Risk of roof collapse: Large areas of the goaf are suspended from the roof, which can easily lead to sudden large-scale roof collapse, threatening the safety of the working space below. Utility Model Content

[0005] To address the technical problem of roof collapse risk in goaf areas due to the lack of a coordinated backfilling process during wire saw mining of inclined or steeply inclined coal seams, a gangue co-filling system based on flexible shield supports and wire saw mining is provided.

[0006] The first aspect of this utility model provides a gangue co-filling system based on flexible shield support and wire saw mining, comprising: A flexible shield support has a front side facing the work space and a back side facing the goaf. The flexible shield support is lowered in sections as the coal seam is mined, and is suitable for isolating the work space from the goaf above. A gangue backfilling system includes a scraper conveyor with several legs at its bottom. The scraper conveyor is adapted to be erected in an external floor tunnel via the legs and anchored to the bottom of the floor tunnel via the legs. The scraper head of the scraper conveyor is provided with a downwardly inclined gangue chute. The discharge end of the gangue chute is adapted to extend to the goaf above the back of the flexible shield support. The flexible shield support is configured to bear the weight generated by the back of the backfilled gangue to assist the flexible shield support itself in being lowered smoothly.

[0007] In some embodiments, the scraper conveyor has a feed hopper at the tail of the scraper conveyor.

[0008] In some embodiments, a mine car is also included, the unloading port of which is arranged above the feed hopper.

[0009] In some embodiments, the scraper conveyor is provided with an anti-slip anchoring structure, which includes rail clamps respectively disposed at the bottom end of each leg. The grooves of the rail clamps are configured to fit and clamp the external transport rails laid in the bottom slab alley, so as to use the external transport rails to resist the slippage of the scraper conveyor.

[0010] In some embodiments, the anti-slip anchoring structure further includes a traction wire rope disposed on the body of the scraper conveyor, the traction wire rope being configured to be connected to a fixed anchor pile disposed externally in the bottom tunnel, so as to work together with the rail clamp to resist the side overturning and sliding of the scraper conveyor.

[0011] In some embodiments, the scraper head and the chute are connected by an angle-adjustable flange, the chute being adjustable in inclination relative to the scraper head via the flange, and the chute being configured to dynamically adjust its downward inclination angle in response to changes in the backfill height of gangue in the goaf.

[0012] In some embodiments, a dedicated connecting roadway for filling is provided between the floor roadway and the goaf, and the body of the scraper conveyor is configured to extend through the connecting roadway located outside the floor roadway and the goaf to provide active conveying power across the connecting roadway. The scraper conveyor's scraper head is configured to extend to the outlet end of the connecting roadway near the goaf, and the chute is connected to the scraper head to extend downward at the outlet end into the goaf.

[0013] In some embodiments, the flexible shield support is provided with a rock-blocking and leak-proof structure on its back, the rock-blocking and leak-proof structure including a rock-blocking plate and a leak-proof metal mesh: The baffle plates are vertically arranged around the outer edges of the back of the flexible shield support to form an enclosed receiving barrier. The leak-proof metal mesh is taut and laid on the skeleton on the back of the flexible shield support, and its perimeter is sealed and overlapped with the inner side of the gangue baffle plate, together forming a gangue carrying chamber with an open top.

[0014] The second aspect of this utility model provides a coal mining device for inclined or steeply inclined coal seams, including a wire saw cutting system and the aforementioned gangue co-filling system based on flexible shield support and wire saw mining, wherein the wire saw cutting system is arranged in the working space below the flexible shield support.

[0015] Compared with the prior art, the technical effects achieved by this utility model are as follows: (1) This utility model, by setting up a scraper conveyor and a downward-extending chute in the bottom roadway, forms a close physical cooperation with the flexible shield support below in a limited space. Compared with the prior art, this solution constructs a "mining-supporting-filling" structure collaborative closed loop, realizing the coordinated linkage between wire saw mechanized cutting and goaf filling as mining progresses, effectively reducing the risk of roof suspension and support instability. The filling gangue not only immediately fills the goaf and controls roof collapse, but its weight is also evenly accumulated on the back of the flexible shield support, forming a stable downward gravity drive, overcoming the problems of uneven force, jamming or overturning caused by the roof suspension of the goaf in the existing flexible shield support, making the support lowering process more stable and greatly reducing the workload of support adjustment.

[0016] (2) To address the risk of material falling from above after the active introduction of backfilling gangue, this utility model specifically adds a gangue-blocking plate and a leak-proof metal mesh to the back of the flexible shield support, physically isolating the gangue in the goaf from the working space below. This specific leak-proof structure not only bears the weight of the backfilling body but also effectively prevents the backfilling gangue from leaking out of the support gaps and falling onto the working area below, completely avoiding damage to cutting workers and wire saw equipment from gangue, and significantly improving the safety level of the working face. In addition, the goaf boundary formed by wire saw cutting is regular, the gangue backfilling body has a dense contact with the roof and floor, and a high roof contact rate. The backfilling body and the flexible shield support work together to bear the roof pressure, making the support lowering process more stable and reducing the workload of support adjustment.

[0017] (3) Addressing the industry pain point that heavy filling equipment in inclined roadways is prone to slippage and overturning, this utility model creatively designs a multi-layered anti-slip anchoring structure consisting of outriggers, rail clamps, and traction wire ropes. In particular, it utilizes the existing mine car transport rails in the roadway as the physical anchor points of the scraper conveyor (the rail clamps are locked to the rails), achieving dual-purpose use of a single rail. This design provides extremely stable anti-slip pull-out force without occupying additional space in narrow roadways, ensuring the absolute stability of the scraper conveyor under continuous, heavy-load, and vibration conditions, and guaranteeing the continuity of filling operations.

[0018] (4) An adjustable flange is provided between the scraper head and the chute. This mechanical structure feature allows the chute to dynamically adjust its downward extension angle according to the real-time change of the height of the gangue pile in the goaf. This effectively avoids the blockage of the chute opening caused by excessive gangue pile or the impact dust caused by excessive drop, and realizes the seamless and smooth connection of mine car unloading, scraper horizontal transportation and chute inclined unloading.

[0019] (5) By setting up a gangue filling system above the flexible shield support and a wire saw cutting system below, the wire saw cutting and gangue filling are coordinated for the same coal seam segment. Under the operation of the gangue filling system, the goaf is filled as it is mined, which effectively controls the risk of roof collapse. At the same time, the filling body improves the stress environment of the surrounding rock, maintains the stability of the roadway, suppresses the continuous expansion of water-conducting fissures, effectively prevents water inrush, and isolates the residual coal in the goaf, preventing the residual coal from spontaneously combusting, thus achieving safe and green mining. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the gangue filling system structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the laying arrangement of the scraper conveyor in one embodiment of this utility model; Figure 3 This is a schematic diagram of the transportation and filling process and anti-slip anchoring structure of the gangue filling system in one embodiment of this utility model; Figure 4 This is a schematic diagram of the layout of the roadway and coal mining face in one embodiment of this utility model; Figure 5 This is a schematic diagram of the anti-leakage structure and auxiliary cutting device in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a coal mining device for inclined or steeply inclined coal seams according to one embodiment of the present invention. Figure 7 This is a schematic diagram of a diamond beaded wire saw structure in one embodiment of this utility model; In the picture: 1-Bottom roadway; 2-Connecting roadway; 3-Return air gate; 4-Return airway; 5-Pseudo-inclined coal face; 6-Coal seam; 7-Goaf; 8-Machine roadway; 9-Ventilation opening; 10-Personnel eye; 11-Coal chute; 12-Transport roadway; 13-Transport gate; 14-Wire saw; 15-Universal wheel assembly in return airway; 16-Upper slideway; 17-Diamond wire saw; 18-Lower slideway; 19-Mine car; 20-Scraper conveyor; 21-Bottom plate; 22-Lower metal frame; 23-Lower horizontal sliding track; 24-Universal wheel assembly and locking components; 25-Cutting side; 26- 27-Vertical sliding rail; 28-Cooling water nozzle; 29-Flexible shield support; 30-Top plate; 31-Upper metal frame; 32-Upper horizontal sliding rail; 33-Rope feeding side; 34-Fixed seat; 35-Lower horizontal tunnel; 36-Wire rope; 37-Beads; 38-Diamond abrasive; 39-Isolation sleeve; 40-Filling gangue; 41-Feed hopper; 42-Fixed anchor pile; 43-Traction wire rope; 44-Scraper tail; 45-Rail clamp; 46-Outrigger; 47-Scraper head; 48-Gangue chute; 49-Gangue baffle plate; 50-Leak-proof metal mesh; 51-Flange. Detailed Implementation

[0021] The technical solution of this utility model is described below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0022] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0023] A gangue backfilling system based on flexible shield support and wire saw mining includes a flexible shield support that is lowered in sections as the coal seam is mined and a gangue backfilling system.

[0024] The flexible shield support, lowered section by section during coal seam mining, is suitable for isolating the working space from the goaf above. The flexible shield support is configured to bear the weight of the backfilled gangue, assisting in its smooth lowering. The back of the flexible shield support is equipped with a gangue-blocking and leak-proof structure, comprising gangue-blocking plates and a leak-proof metal mesh: the gangue-blocking plates are vertically arranged around the outer perimeter of the back of the flexible shield support, forming an enclosed support barrier; the leak-proof metal mesh is tautly laid on the frame of the back of the flexible shield support, its perimeter sealingly overlapping the inner side of the gangue-blocking plates, together forming a gangue-bearing chamber with an open top.

[0025] The waste rock filling system includes a scraper conveyor with several outriggers at its bottom. The scraper conveyor is adapted to be erected and anchored to the bottom of an external floor slab tunnel via these outriggers. Specifically, each outrigger has a rail catcher at its bottom end. The rail catcher's slot is configured to fit and securely fasten to an external transport track laid within the floor slab tunnel, thus utilizing the external transport track to prevent the scraper conveyor from sliding down. The scraper conveyor body is equipped with a traction steel wire rope, which is connected to fixed anchor piles installed in the floor slab tunnel. This traction steel wire rope, together with the rail catcher, prevents the scraper conveyor from tipping over or sliding down. The rail catcher and the traction steel wire rope together constitute the scraper conveyor's anti-slip anchoring structure.

[0026] The scraper conveyor's scraper head is equipped with a downwardly inclined chute, the discharge end of which is adapted to extend into the goaf above the flexible shield support. Since the floor roadway where the scraper conveyor is located cannot directly connect to the goaf, the scraper conveyor's body is configured to extend through a connecting roadway located between the floor roadway and the goaf to provide active conveying power across the connecting roadway. The scraper head of the scraper conveyor is configured to extend to the outlet end of the connecting roadway near the goaf, and the chute is connected to the scraper head to extend downwards into the goaf from the outlet end.

[0027] The scraper head is connected to the chute via an angle-adjustable flange. The chute is configured to dynamically adjust its downward angle of inclination as the backfill height of gangue in the goaf changes.

[0028] The scraper conveyor has a feed hopper at its tail end, and the filling gangue is transported to the feed hopper by mine cars.

[0029] Example 1 like Figures 1-6 As shown, a gangue backfilling system based on flexible shield support and wire saw mining includes a flexible shield support 28 that is lowered in sections as the coal seam is mined and a gangue backfilling system.

[0030] The wire saw cutting inclined coal seam mining face system excavates three roadways: transport roadway 12, return air roadway 4, and bottom roadway 1. Return air roadway 4 is connected to upper level roadway 34, and transport roadway 12 is connected to lower level roadway 35. The pseudo-inclined mining face 5 is arranged between upper level roadway 34 and lower level roadway 35. The transport roadway 12 is mainly used for transporting coal and supplying fresh air. The return air roadway 4 is mainly used for return air from the working face, pedestrian and material transportation. The bottom roadway 1 is used to lay tracks for mine cars 19 to run on, and is responsible for transporting crushed gangue to the upper part of the goaf 7 for filling. The bottom roadway 1 is excavated along the coal seam at certain intervals towards the goaf 7 as a special connecting roadway 2 for filling. The end of the connecting roadway 2 is connected to the upper boundary of the goaf 7. The return air gate 3 is connected to the return air roadway 4, and the transport gate 13 is connected to the transport roadway 12. The coal chute 11, the pedestrian eye 10 and the ventilation eye 9 are arranged between the machine roadway 8 and the transport roadway 12.

[0031] A flexible shield support 28 is arranged in the pseudo-inclined coal mining face 5. Preferably, the flexible shield support 28 consists of a three-frame integrated structure, with one main frame and one auxiliary frame arranged on the left and right sides. The main frame and auxiliary frames are flexibly connected by connecting plates and steel wire ropes. The flexible shield support 28 is lowered section by section as the coal seam 6 is mined. Above it is the mined goaf 7, and below it is the coal seam 6 to be mined, physically isolating the goaf 7 from the working space. The back of the flexible shield support 28 is equipped with a rock-blocking and leakage-prevention structure. Specifically, the rock-blocking and leakage-prevention structure includes rock-blocking plates 49 set around the perimeter of the back of the flexible shield support, and leakage-prevention metal mesh 50 arranged along the extension direction of the back of the flexible shield support. The flexible shield support 28 is lowered section by section by its own weight and the weight of the gangue filling it on top. The gangue retaining plate 49 and the leak-proof metal mesh 50 work together to physically isolate the gangue in the goaf 7 from the working space below, preventing the gangue from leaking out from the gaps or edges of the support.

[0032] The leak-proof metal mesh 50 and the retaining plate 49 together form a filling material bearing chamber. When the filling rock 40 is unloaded from the upper rock chute 48, this retaining and leak-proof structure can completely intercept the rock, preventing it from leaking into the working space below through the gaps in the support, thus forming an absolute physical isolation. At the same time, the weight of the filling rock 40 is evenly supported by the leak-proof structure, which is converted into a uniform positive pressure on the flexible shield support 28. This overcomes the industry technical problem of uneven support force and sluggish lowering caused by the suspended roof in the goaf, and achieves a smooth lowering driven by gravity.

[0033] The gangue filling system consists of mine cars 19, scraper conveyors 20, and gangue chutes 48, and is arranged in the bottom roadway 1 and connecting roadway 2. The bottom roadway 1 is excavated in the rock strata of the coal seam, and a track is laid in the bottom roadway 1 for the mine cars 19 to transport and fill gangue 40. The scraper conveyor 20 is arranged along the bottom roadway 1 and connecting roadway 2. Its body is supported by multiple legs 46 at the bottom of the bottom roadway 1 and connecting roadway 2. Each leg 46 is equipped with a rail clamp 45 at its bottom end. Each rail clamp 45 is clamped and fixed to the track in the bottom roadway 1 and connecting roadway 2, connecting the scraper conveyor 20 body to the track as one unit. The scraper conveyor 20 body is also equipped with a traction steel wire rope 43, which is connected to a fixed anchor pile 42 in front of the bottom roadway 1 to form a reverse traction force to prevent the scraper conveyor 20 from sliding downwards due to its own weight or vibration.

[0034] The scraper conveyor 20 has a feed hopper 41 at its tail end 44, and a scraper head 47 that extends to the outlet end of the connecting roadway 2 near the goaf 7. A chute 48 is connected to the scraper head 47 and extends downward at the outlet end into the goaf 7. The mine car 19 transports the backfill gangue 40 to the inside of the bottom roadway 1 and then unloads it into the feed hopper 41. The backfill gangue 40 is continuously transported by the scraper conveyor 20 to the scraper head 47 and then unloaded into the goaf 7 above the flexible shield support 28 via the chute 48, achieving continuous backfilling.

[0035] An adjustable-angle connecting flange 51 is provided at the connection between the scraper head 47 and the chute 48. By adjusting the angle of the connecting flange 51, the inclination angle and unloading direction of the chute 48 can be changed. This mechanical mechanism can not only adapt to the filling needs of working faces with different inclination angles, but also dynamically adjust its downward extension angle according to the real-time changes in the height of the gangue accumulation in the goaf, effectively avoiding chute blockage caused by excessive gangue accumulation.

[0036] Considering that the bottom roadway 1 and the goaf 7 are connected by a connecting roadway 2, and that the connecting roadway 2 has geological constraints such as long distance and varying dip angles, in this device, the scraper conveyor 20 is configured to extend through the connecting roadway 2, with its scraper head 47 extending all the way to the exit end of the connecting roadway 2 near the goaf 7. The scraper conveyor 20 is an active conveying device that relies on a motor-driven chain scraper to traverse the connecting roadway. It provides strong active power to overcome friction, completely avoiding the serious accumulation and blockage problems of gangue that would inevitably occur if a chute were used for passive gravity-driven long-distance passage through the roadway, greatly reducing the resistance to cross-space transportation.

[0037] In one embodiment, the scraper conveyor 20 has been adapted for the working conditions of the inclined floor roadway 1. Specifically, the length and width of the scraper conveyor 20 have been compacted according to the actual cross-sectional dimensions of the floor roadway 1, ensuring that the equipment can be flexibly arranged in the narrow roadway.

[0038] In another embodiment, a protective canopy is provided above the operating area of ​​the scraper conveyor 20. The protective canopy is made of wear-resistant steel plate and is used to prevent falling rocks from the top from injuring the equipment and operators.

[0039] The overall working method of the gangue co-filling system based on flexible shield support and wire saw mining follows a process cycle of filling as mining progresses and gravity coordination. The specific steps are as follows: (1) System erection and anchoring: A flexible shield support 28 with a back retaining plate 49 and a leak-proof metal mesh 50 is assembled in the pseudo-inclined coal mining face 5. A coal seam cutting device is installed under the flexible shield support 28. A scraper conveyor 20 is installed in the bottom roadway 1. The scraper conveyor 20 is firmly locked to the roadway track of the bottom roadway 1 and the connecting roadway 2 by using the rail clamps 45 at the bottom of the outriggers 46. After the body of the scraper conveyor 20 passes through the connecting roadway 2, a chute 48 is installed at its outlet end through an angle-adjustable flange 51 so that the lower end of the chute 48 is aligned with the back of the flexible shield support 28.

[0040] (2) Mechanized coal cutting: Start the coal seam cutting system to cut the coal wall. The cut coal falls into the lower coal chute 11 or is transported out by the transport equipment. As the coal is mined out, space is freed up below the flexible shield support 28 for lowering.

[0041] (3) Cross-space active filling operation: Filling operation is carried out at the same time or alternately during coal cutting. The mine car 19 unloads the filling gangue 40 into the feed hopper 41 of the scraper conveyor 20 in the bottom roadway 1. The scraper conveyor 20 provides strong active conveying power to overcome the gentle resistance and transport the filling gangue 40 through the connecting roadway 2. After the filling gangue 40 reaches the outlet end of the connecting roadway 2, it slides down by gravity through the gangue chute 48 and is accurately poured onto the gangue blocking and leakage prevention structure on the back of the flexible shield support 28.

[0042] (4) Stress synergy and support lowering cycle: As the back of the support is continuously filled with gangue 40, the gangue blocking and leakage prevention structure completely blocks the gangue from leaking out, ensuring the safety of the wire saw cutting coal below. At the same time, the weight of the gangue applies uniform and continuous downward compressive stress to the flexible shield support 28. With the cutting of the coal below, the flexible shield support 28 moves downward smoothly and upright under the synergistic effect of its own weight and the pressure of the backfilling gangue. The original goaf 7 is densely filled by the lowered gangue filling body, effectively controlling the displacement of the roof and preventing the violent release of surrounding rock stress.

[0043] The above steps are repeated cyclically to achieve integrated closed-loop mining of steeply inclined coal seams, combining efficient coal mining with green backfilling.

[0044] Example 2 like Figures 5-7 As shown, a coal mining device for inclined or steeply inclined coal seams includes a wire saw cutting system and the aforementioned gangue co-filling system based on flexible shield support and wire saw mining. The flexible shield support 28 is arranged in the pseudo-inclined mining face 5 between the top plate 29 and the bottom plate 21 of the coal seam, and the wire saw cutting system is arranged in the working space below the flexible shield support 28.

[0045] The wire saw cutting system comprises a wire saw machine 14, a diamond beaded wire saw 17, and a coal mining auxiliary cutting device. The diamond beaded wire saw 17 rotates infinitely under the drive of the wire saw machine 14 to cut the coal seam. The coal mining auxiliary cutting device changes the cutting trajectory of the diamond beaded wire saw 17. The wire saw machine 14 is an explosion-proof crawler-type hydraulic wire saw machine, which is arranged in the return airway 4. The wire saw is tensioned by moving back and forth towards the return air gate 3.

[0046] The coal mining auxiliary cutting device is installed within the protection range below the flexible shield support 28, and its specific structure is as follows: the lower metal outer frame 22 is fixed on the base plate 21, the lower horizontal sliding rail 23 is installed on the upper surface of the lower metal outer frame 22, the upper horizontal sliding rail 31 is installed on the lower surface of the upper metal outer frame 30, and the vertical sliding rail 26 is installed between the lower horizontal sliding rail 23 and the upper horizontal sliding rail 31 through a fixing seat 33. The fixing seat 33 is provided with a locking nut, which can be tightened or loosened to control the left and right movement or fixation of the vertical sliding rail 26 on the horizontal sliding rail. The universal wheel assembly and locking component 24 are composed of a universal wheel assembly and a locking component, and are installed on the vertical sliding rail 26. The universal wheel assembly can be tightened or loosened on the vertical sliding rail 26 to move up and down and be fixed. The universal wheel assembly consists of a vertical guide wheel and a horizontal guide wheel, and the angles of the vertical guide wheel and the horizontal guide wheel can be adjusted independently.

[0047] The wire saw cutting system, flexible shield support, and gangue filling system work together to cut and fill the coal seam. After the wire saw cutting system completes the cutting of the current coal body and sets up the flexible shield support 28, the gangue filling system immediately fills the newly exposed goaf 7.

[0048] The diamond wire saw 17 is divided into a cutting side 25 and a rope feeding side 32. Guided by the universal wheel assembly 15, universal wheel assembly, and locking element 24 in the return airway, it forms a reverse cutting loop. The cutting side 25 is used to cut the coal seam, and the rope feeding side 32 is used to feed the rope. The reverse cutting loop refers to the diamond wire saw 17 forming a closed loop around the coal body to be cut, with one side being the cutting side 25 close to the coal wall and the other side being the returning rope feeding side 32. Driven by the wire saw machine 14, the diamond wire saw 17 continuously circulates, with the cutting side continuously grinding the coal body to achieve continuous cutting, vertically cutting the coal seam between the upper slide groove 16 and the lower slide groove 18. The wire saw cutting system also includes a cooling water nozzle 27, installed on the coal mining auxiliary cutting device, which sprays water to cool the cutting area of ​​the diamond wire saw 17 during cutting.

[0049] like Figure 7 As shown, the diamond wire saw consists of a steel wire rope 36, an isolation sleeve 39, and a string of beads 37 inlaid with diamond abrasive grains 38. The diamond abrasive grains 38 inlaid on the string of beads 37 are used to cut coal seams.

[0050] The above provides a brief description of the wire saw cutting system and cutting method. For detailed coal mining methods and equipment, please refer to the applicant's prior Chinese patent application ZL202610039309.4. After the entire inclined coal seam is mined according to the method in that patent, a flexible shield support is lowered and gangue is filled in.

[0051] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A gangue co-filling system based on flexible shield support and wire saw mining, characterized in that, include: Flexible shield support (28) has a front side facing the work space and a back side facing the external goaf (7). The gangue filling system includes a scraper conveyor (20) with several legs (46) at the bottom of the machine body. The scraper conveyor (20) is mounted on the outer bottom slab tunnel (1) through the legs (46) and anchored to the bottom of the bottom slab tunnel (1) through the legs (46). The scraper head (47) of the scraper conveyor (20) is provided with a downwardly inclined gangue chute (48).

2. The gangue co-filling system based on flexible shield support and wire saw mining as described in claim 1, characterized in that, The scraper conveyor (20) has a feed hopper (41) at the scraper tail (44).

3. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 2, characterized in that, It also includes a mine car (19), the unloading port of which is arranged above the feed hopper (41).

4. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 1, characterized in that, The scraper conveyor (20) is equipped with an anti-slip anchoring structure, which includes rail clamps (45) respectively installed at the bottom of each leg (46).

5. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 4, characterized in that, The anti-slip anchoring structure also includes a traction steel wire rope (43) installed on the body of the scraper conveyor (20), which is configured to be connected to a fixed anchor pile (42) installed on the bottom slab (1) externally.

6. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 1, characterized in that, The scraper head (47) and the chute (48) are connected by an angle-adjustable flange (51), and the angle of inclination of the chute (48) relative to the scraper head (47) is adjustable via the flange (51).

7. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 1, characterized in that, A dedicated connecting roadway (2) for filling is arranged between the bottom roadway (1) and the goaf (7), and the body of the scraper conveyor (20) is configured to extend through the connecting roadway (2).

8. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 7, characterized in that, The scraper head (47) of the scraper conveyor (20) is configured to extend to the exit end of the connecting roadway (2) near the goaf (7).

9. The gangue co-filling system based on flexible shield support and wire saw mining according to claim 1, characterized in that, The flexible shield support (28) has a rock-blocking and leak-proof structure on its back, which includes a rock-blocking plate (49) and a leak-proof metal mesh (50). The baffle plate (49) is vertically arranged around the outer edge of the back of the flexible shield support (28) to form an enclosed receiving barrier; The leak-proof metal mesh (50) is stretched and laid on the skeleton on the back of the flexible shield support (28), and its perimeter is sealed and overlapped with the inner side of the gangue baffle (49), together forming a gangue carrying chamber with an open top.

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