Linkage bag supporting device and method for coal mine goaf

Abstract

The application discloses a kind of linkage capsule bag supporting device and method of coal mine goaf, it is related to mining filling mining technical field.The device includes release slide rail and the multiple folding capsules bag slidingly disposed on it, and adjacent folding capsules bag is connected by traction rope.Each folding capsule bag includes telescopic framework and capsule bag, telescopic framework includes telescopic structure and slidingly set inner framework and outer framework, initially telescopic structure is compressed, and inner framework and outer framework are contracted, when telescopic framework is dropped from release slide rail, telescopic structure drives telescopic framework to lengthen and is supported between roof and floor, forms temporary support.Capsule bag is provided with grouting port, for grouting to form solidified filling body.The application can quickly deploy temporary support without inflating, and multiple folding capsules bag follows the operation rhythm of hydraulic support, and sequentially drops to form relay type continuous uniform support belt, and operation efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of mining backfilling technology, specifically to a linked bag support device and method for coal mine goaf areas. Background Technology

[0002] In underground coal mine backfilling mining, timely support of the goaf is a crucial step in controlling roof subsidence and ensuring the safety of the mining area. Currently, most coal mine goaf backfilling support devices adopt a method of independently arranging multiple bag units behind hydraulic supports. The basic working process is as follows: first, each individual bag is inflated to expand and support the roof, forming temporary support; then, grout is injected into the bag, and after the grout solidifies, it forms a solidified backfill.

[0003] However, in the current filling support device, each individual bag completes the inflation and grouting process independently. Each bag is an independent entity, which leads to weak support zones between adjacent bags during the inflation support process. This results in the lack of continuous and reliable temporary support for the roof of the goaf before the grout solidifies, causing the filling body to have inconsistent shape and uneven support, and making it even more difficult to match the advance rhythm of the hydraulic support. Summary of the Invention

[0004] The purpose of this invention is to provide a linked bag support device and method for coal mine goaf areas to solve the above-mentioned problems.

[0005] The technical solution of this invention is: A linked bag support device for a coal mine goaf includes: a release slide rail and a plurality of folded bags slidably arranged on the release slide rail. Adjacent folded bags are fixedly connected by a traction rope. One end of the release slide rail is connected to the hydraulic support, and the other end serves as the release end, which is opposite to the direction of the working face advance. The release slide rail is connected to the rear beam of the hydraulic support. The plurality of folded bags are arranged in sequence along the release slide rail. The folded bag closest to the release end is the first to detach from the release slide rail after the hydraulic support moves forward.

[0006] Each of the folded bags includes a telescopic frame and a bag, with the bag disposed inside the telescopic frame. The telescopic frame includes an inner frame and an outer frame, with the inner frame fitted inside the outer frame. One end of the inner frame has an eave, and the eave and the outer frame are slidably connected via a telescopic structure. The telescopic frame has two states: a compressed state, where the telescopic structure between the inner and outer frames is compressed; and an extended state, where the telescopic frame detaches from the release rail, the telescopic structure extends, driving the telescopic frame to lengthen and support it between the goaf roof and goaf floor. A telescopic structure is provided between each side of the eave of the inner frame and each side of the top shell wall of the outer frame to ensure stable deployment of the telescopic frame.

[0007] The two ends of the bag are connected to the inner skeleton and the outer skeleton respectively, and expand and contract synchronously with the telescopic skeleton. The bag is provided with a grouting port for injecting filling grout into the bag after the temporary support is completed to form a solidified filling body.

[0008] The hydraulic support moves in steps ranging from 80 centimeters to 1 meter, and the solidified filling material is spaced two steps apart from the hydraulic support. This ensures that the solidified filling material and the hydraulic support do not require very strong support.

[0009] Furthermore, the telescopic structure includes: a second rod, which is a hollow structure, embedded in one side wall of the outer frame, with one end of the second rod protruding from the side wall of the outer frame and the other end having a channel communicating with the interior, the inner wall of the channel having a groove along the axial direction of the second rod; a motor, disposed inside the second rod, the motor being equipped with a power supply, the power supply circuit being equipped with a trigger switch, the trigger switch being a collision switch with adjustable sensitivity, which connects the power circuit after touching the base plate; the trigger switch being disposed on the end of the second rod protruding from the side wall of the outer frame; a transmission part, including: a screw, coaxially connected to the output shaft of the motor; an internally threaded sleeve, one end of which is rotatably sleeved with the screw and threadedly engaged with the screw, the other end of the internally threaded sleeve extending to the channel; a first rod, one end of which extends into the second rod through the channel and is fixedly sleeved on the internally threaded sleeve, the periphery of the first rod having protrusions arranged along its axial direction, the protrusions slidingly engaging with the groove.

[0010] Furthermore, a limiting ring is fitted onto one end of the first rod, and the outer diameter of the limiting ring is larger than the diameter of the channel. This prevents the first rod from detaching from the second rod.

[0011] Furthermore, the trigger switch is equipped with a delay circuit module. The delay circuit module allows for a delay setting, ensuring that the telescopic structure extends only after the telescopic frame has stabilized.

[0012] Furthermore, the traction ropes are fixedly connected to the outer frame, and each traction rope is of the same length.

[0013] Furthermore, the telescopic frame is a square tube structure, with both the inner and outer frames of each telescopic frame being square tubes. Stabilizers are provided on the bottom outer side of each outer frame and the top outer side of each inner frame. The stabilizers are triangular legs, which keep the folded bag stable during operation, preventing displacement or tipping due to other reasons.

[0014] Furthermore, one pair of oppositely arranged sides of the inner frame are both first folding plates; the plates of the outer frame corresponding to the positions of the first folding plates are both second folding plates. Both the first and second folding plates include two plates connected by a folding shaft, and the folding direction is towards the inside of the folding pouch. The folding plates fold the folding pouch along the length of the release rail, reducing the space occupied by a single folding pouch, thereby allowing more folding pouches to be inserted onto the release rail.

[0015] Furthermore, a gap structure is configured between the two plates of the first folding plate and the folding shaft. The gap structure includes: two first connecting blocks symmetrically arranged on the outer circumference of the folding shaft, each connecting block having a sliding groove, the groove being a T-shaped channel; and two second connecting blocks respectively connected to one end of the first folding plate, each second connecting block having a T-shaped rod. The horizontal end of the T-shaped rod inserts into the wide portion of the T-shaped channel and is confined within the T-shaped channel, while the vertical portion of the T-shaped rod slides into the narrow groove of the T-shaped channel. This intermittent structure accommodates the required amount of movement of the first folding plate during folding.

[0016] Furthermore, it also includes: a pulley, externally wrapped with a rubber ring, the pulley being mounted on the top of the plate body away from the release end on another pair of opposite sides of the inner frame via a bracket, the pulley being rolled within the track groove of the release rail; a limiter, located on the inner wall of one side of the track groove of the release rail near the release end, the limiter being a limit block, the side of the limit block away from the release end being a sloped surface towards the release end, a channel being spaced between the top of the limit block and its opposite inner wall of the track groove, the rubber ring on the pulley being able to pass through the channel after being squeezed; and a pre-broken connector, a plastic connecting strip with a weak band in the middle, the two ends of the plastic connecting strip being respectively connected to the two plates of the first folding plate, the plastic connecting strip breaking from the weak band by external tension.

[0017] A method for linked bag support in a coal mine goaf, utilizing the aforementioned filling support device, includes the following steps: Multiple folded bags are installed sequentially on the release slide rail, and adjacent folded bags are connected by traction ropes. One end of the release slide rail is connected to the rear beam of the hydraulic support, and the other end serves as the release end, which is opposite to the direction of the working face advance.

[0018] After the hydraulic support moves forward, the folded bag closest to the release end falls off the release slide rail, the telescopic structure extends, driving the telescopic frame to extend and support between the goaf roof and the goaf floor, forming temporary support. At the same time, the bag unfolds synchronously with the telescopic frame.

[0019] As the hydraulic support continues to move forward, for every distance the traction rope moves, a folded bag detaches from the release rail and forms temporary support between the top and bottom plates through the telescopic structure; multiple folded bags detach from the release rail in sequence and unfold in turn to form a relay-type continuous temporary support belt.

[0020] For folded bags that have been temporarily supported, filling grout is injected into the bag through the grouting port to form a solidified filling body.

[0021] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a release rail to sequentially thread multiple folded bags, with traction ropes between adjacent bags. This allows the bags to detach sequentially from the release rail in conjunction with the operation of the hydraulic support. The expansion of the telescopic structure extends the telescopic frame, providing temporary support between the roof and floor of the goaf. This not only naturally matches the advancement rhythm of the hydraulic support but also creates continuous and uniform temporary support along the working face's advancing direction. Furthermore, temporary support can be quickly established between the roof and floor without inflating the bags. Simply injecting filling grout into the folded bags after temporary support is achieved using a grouting station forms a solidified filling body, significantly improving the efficiency of mining support operations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the working state of the present invention.

[0023] Figure 2 This is a schematic diagram of the release slide rail of the present invention.

[0024] Figure 3 This is a top view of the structural schematic diagram of the folded pouch of the present invention.

[0025] Figure 4 This is a schematic diagram of the second state structure of the folded pouch of the present invention.

[0026] Figure 5 This is a schematic diagram of the first state structure of the folded pouch of the present invention.

[0027] Figure 6 This is a schematic diagram of the inner skeleton in a stretched state according to the present invention.

[0028] Figure 7 This is a schematic diagram of the internal structure of the telescopic structure of the present invention.

[0029] Figure 8 This is a schematic diagram of the trigger switch, motor, and power supply of the present invention.

[0030] Among them, 1. Grouting pump, 2. Folding shaft, 3. Folding structure, 4. Stabilizer, 5. Release slide rail, 6. Traction rope, 7. Solidified filling body, 8. Hydraulic support, 9. Release end, 10. Telescopic frame, 11. Pulley, 12. Limiter, 13. Telescopic structure, 14. Bag, 15. Grouting port, 16. Gap structure, 17. Trigger switch, 18. Delay circuit module, 19. Power supply, 20. Motor, 21. Screw, 22. Internal threaded sleeve, 23. First rod body, 24. Second rod body, 25. Pre-broken connector. Detailed Implementation

[0031] The following is combined Figures 1 to 8 The specific embodiments of the present invention will be described in detail below. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, 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 are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] It should be noted that the circuit connections involved in this invention all adopt conventional circuit connection methods and do not involve any innovation.

[0034] Example like Figure 1 As shown, a linked bag support device for a coal mine goaf includes: a release slide rail 5 and multiple folded bags slidably arranged on the release slide rail 5. Adjacent folded bags are fixedly connected by traction ropes 6, which are fixedly connected to the outer frame. Each traction rope 6 has the same length to control the spacing between each folded bag. One end of the release slide rail 5 is connected to a hydraulic support 8, and the other end serves as a release end 9, opposite to the direction of the working face advance. The release slide rail 5 is connected to the rear beam of the hydraulic support 8. The multiple folded bags are arranged sequentially along the release slide rail 5, and the folded bag closest to the release end 9 is the first to detach from the release slide rail 5 after the hydraulic support 8 moves forward.

[0035] Each folded bag includes a telescopic frame 10 and a bag 14, with the bag 14 disposed inside the telescopic frame 10. The telescopic frame 10 includes an inner frame and an outer frame, with the inner frame fitted inside the outer frame. One end of the inner frame is provided with an eave, and the eave and the outer frame are slidably engaged by a telescopic structure 13. The telescopic frame 10 has two states: a compressed state, in which the telescopic structure 13 between the inner and outer frames is compressed; and an extended state, in which the telescopic frame 10 detaches from the release rail 5, the telescopic structure 13 extends, driving the telescopic frame 10 to extend and be supported between the goaf roof and the goaf floor. A telescopic structure 13 is provided between each side of the eave of the inner frame and each side of the top shell wall of the outer frame to ensure stable deployment of the telescopic frame 10.

[0036] The two ends of the bag 14 are connected to the inner skeleton and the outer skeleton respectively, and expand and contract synchronously with the telescopic skeleton 10. The bag 14 is configured with a telescopic allowance in the first state of the telescopic skeleton 10. The bag 14 is provided with a grouting port 15. After the temporary support is completed, the grouting pump 1 injects filling grout into the bag 14 to form a solidified filling body 7.

[0037] In some embodiments, the hydraulic support 8 moves in steps of 80 cm to 1 m, and the interval between the solidified filling body 7 and the hydraulic support 8 is two steps. This is to ensure that a very strong support is not required between the solidified filling body 7 and the hydraulic support 8.

[0038] like Figure 7 and Figure 8 As shown, the telescopic structure 13 includes: a second rod 24, a first rod 23, a motor 20, and a transmission part. The second rod 24 is a hollow structure, embedded in one side wall of the outer frame, with one end of the second rod 24 protruding from the side wall of the outer frame and the other end having a channel connecting to the interior. The inner wall of the channel has a groove along the axial direction of the second rod 24. The motor 20 is located inside the second rod 24 and is equipped with a power supply 19, which is a battery. The circuit of the power supply 19 is equipped with a trigger switch 17, which is a collision switch with adjustable sensitivity. The circuit of power supply 19 is connected after touching the base plate; the trigger switch 17 is set on the end of the second rod 24 that protrudes from the side wall of the outer frame; the transmission part includes: a screw 21 and an internal threaded sleeve 22, the screw 21 is coaxially connected to the output shaft of the motor 20; one end of the internal threaded sleeve 22 is rotatably sleeved with the screw 21 and threadedly engaged with the screw 21, and the other end of the internal threaded sleeve 22 extends to the channel; one end of the first rod 23 extends into the second rod 24 through the channel and is fixedly sleeved on the internal threaded sleeve 22, and the periphery of the first rod 23 is provided with convex strips along its axial direction, and the convex strips are slidably engaged with the grooves.

[0039] It is worth noting that after the telescopic frame 10 is extended, the stress concentration point first appears 7-8 meters in front of the working face. Subsequently, the stress rapidly decreases and tends to stabilize. Therefore, the telescopic frame 10, which is pressed against the top and bottom plates, will not retract due to the pressure from the top plate. At the same time, the grout filling the bag 14 solidifies quickly and can form a stable support structure together with the telescopic frame 10 in a short time. In some embodiments, an automatic locking component can also be provided on the screw 21 and the internal threaded sleeve 22. This component is a mature technology in screw drive structures, which automatically locks after the screw 21 is engaged to prevent retraction.

[0040] In some embodiments, such as Figure 7 As shown, a limiting ring is fitted at one end of the first rod 23, and the outer diameter of the limiting ring is larger than the diameter of the channel. The function of the limiting ring is to prevent the first rod 23 from dislodging from the second rod 24 when the motor 20 drives the transmission part and the first rod 23 and the second rod 24 extend to their maximum distance. It is worth noting that the maximum extension distance of the telescopic structure 13 is greater than the distance between the top plate and the bottom plate.

[0041] In some embodiments, such as Figure 8 As shown, the trigger switch 17 is equipped with a delay circuit module 18. The delay circuit module 18 is used to set a delay so that the telescopic structure 13 extends only after the telescopic frame 10 has stabilized, for example, a delay time of 1 second to 2 seconds.

[0042] In some embodiments, the telescopic frame 10 is a square tube structure, with both the inner and outer frames of each telescopic frame 10 being square tubes, and a stabilizer 4 is provided on the bottom outer side of each outer frame and the top outer side of each inner frame. Figure 4 As shown, the stabilizer 4 is a triangular support leg, which keeps the folding bag stable when it is in operation and prevents it from shifting or tipping over due to other reasons.

[0043] In some embodiments, such as Figure 2 , Figure 3 and Figure 5 As shown, both the inner and outer frames are equipped with folding structures 3, which include a first folding plate and a second folding plate. One pair of opposite sides of the inner frame are both first folding plates; the plates on the outer frame corresponding to the first folding plates are both second folding plates. Both the first and second folding plates consist of two plates connected by a folding shaft 2, and their folding direction is towards the inside of the folding pouch. The folding plates fold the folding pouch along the length of the release rail 5, reducing the space occupied by a single folding pouch and allowing more folding pouches to be inserted onto the release rail 5.

[0044] like Figure 6As shown, a gap structure 16 is configured between the two plates of the first folding plate and the folding shaft 2. In this embodiment, the gap structure 16 includes at least two first connecting blocks and two second connecting blocks, for example, 20 first and second connecting blocks. The two first connecting blocks and the second connecting blocks are grouped together. Taking one group of first and second connecting blocks as an example, the two first connecting blocks are symmetrically arranged on the outer circumferential surface of the folding shaft 2. Each connecting block has a sliding groove, which is a T-shaped channel. The two second connecting blocks are respectively connected to one end of the first folding plate. A T-shaped rod is configured on the second connecting block. The horizontal end of the T-shaped rod is inserted into the wide part of the T-shaped channel and confined within the T-shaped channel. The vertical part of the T-shaped rod slides in conjunction with the narrow groove of the T-shaped channel. This intermittent structure accommodates the required amount of movement of the first folding plate during folding. It is worth noting that the T-shaped channel and the T-shaped rod are existing structures, and their details will not be elaborated upon here.

[0045] In some embodiments, such as Figure 2 As shown, it also includes: a pulley 11 and a limiter 12. The pulley 11 is covered with an elastic rubber ring. The pulley 11 is mounted on the top of the plate on the other pair of opposite sides of the inner frame, away from the release end 9, via a bracket. The pulley 11 rolls within the track groove of the release rail. The limiter 12 is located on the inner wall of one side of the track groove of the release rail 5, near the release end 9. The limiter 12 is a limit block. The side of the limit block away from the release end 9 is a sloped surface towards the release end 9. A gap is formed between the top of the limit block and the inner wall of its opposite track groove. The height of the channel is less than the overall diameter of the pulley 11, but the height of the channel allows the rubber ring on the pulley 11 to pass through after being squeezed. The height of the channel is designed to provide resistance to the pulling of the traction rope 6, so that the pulling force is greater than the threshold at which the pre-break connector 25 can break. The pre-break connector 25 is a plastic connecting strip with a weak band in the middle. The two ends of the plastic connecting strip are respectively connected to the two plates of the first folded plate. The plastic connecting strip breaks from the weak band by external pulling force. Openings can be provided at both ends of the weak band, thereby reducing the threshold at which the breakage occurs.

[0046] A method for linked bag support in a coal mine goaf, utilizing the aforementioned filling support device, includes the following steps: Multiple folded bags are sequentially threaded onto the release slide rail 5, and adjacent folded bags are connected by a traction rope 6. One end of the release slide rail 5 is connected to the rear beam of the hydraulic support 8, and the other end serves as the release end 9, which is opposite to the direction of the working face advance.

[0047] After the hydraulic support 8 moves forward, the folded bag closest to the release end 9 falls off the release slide rail 5, triggering the trigger switch 17 of the telescopic structure 13, thereby energizing the motor 20. The output shaft of the motor 20 causes the screw 21 to rotate, thereby pushing out the first rod 23 through the internal threaded sleeve 22. At this time, the telescopic frame 10 extends and supports between the goaf roof and the goaf floor, thus forming a fixed temporary support. At the same time, the bag 14 unfolds synchronously with the telescopic frame 10.

[0048] Since the aforementioned folded pouch has formed a fixed temporary support, it now acts as a fixed point. As the hydraulic support 8 continues to move forward, just as the folded pouch is about to be pulled off the release rail 5, the limiter 12 provides resistance, pulling off the pre-broken connector 25 connected to the first folding plate, thereby unfolding the folding structure 3. Figure 5 The state transition to such Figure 3 The rectangular frame shown has a hydraulic support 8. At this time, the hydraulic support 8 continues to move forward so that the unfolded folded bag is pulled off the release slide rail 5 and falls off, forming a temporary support between the top plate and the bottom plate through the telescopic structure 13. Multiple folded bags fall off the release slide rail 5 in sequence and unfold in sequence in the above manner to form a relay-type continuous temporary support belt.

[0049] For the folded bag that has been temporarily supported, the filling grout is injected into the bag 14 through the grouting port 15 by the grouting pump 1 to form a solidified filling body 7.

[0050] The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A linked bag support device for coal mine goaf areas, characterized in that, include: The release slide rail and multiple folded pouches are slidably arranged on the release slide rail, and two adjacent folded pouches are fixedly connected by a traction rope. One end of the release slide rail is connected to the hydraulic support, and the other end serves as the release end, which is opposite to the working face advancing direction. Each of the folded pouches includes a telescopic frame and a pouch, the pouch being disposed inside the telescopic frame; The telescopic frame includes an inner frame and an outer frame. The inner frame is fitted inside the outer frame. One end of the inner frame is provided with an eave. The eave and the outer frame are slidably engaged by a telescopic structure. The telescopic frame has two states: one is a compressed state, in which the telescopic structure between the inner and outer frames is compressed; the other is an extended state, in which the telescopic frame detaches from the release rail, the telescopic structure extends, driving the telescopic frame to extend and support it between the top and bottom plates of the goaf. The two ends of the bag are connected to the inner skeleton and the outer skeleton respectively, and expand and contract synchronously with the telescopic skeleton. The bag is provided with a grouting port for injecting filling grout into the bag after the temporary support is completed to form a solidified filling body.

2. The linked bag support device for coal mine goaf according to claim 1, characterized in that, The telescopic structure includes: The second rod is a hollow structure. The second rod is embedded in one side wall of the outer frame, and one end of the second rod protrudes from the side wall of the outer frame. The end face of the other end is opened with a channel connecting the interior. The inner wall of the channel is opened with a groove along the axial direction of the second rod. A motor is installed inside the second rod body. The motor is equipped with a power supply, and the circuit of the power supply is equipped with a trigger switch, which connects the power supply circuit after touching the base plate. The transmission part includes: a screw, coaxially connected to the output shaft of the motor; and an internally threaded sleeve, one end of which is rotatably sleeved with the screw and threadedly engaged with the screw, the other end of which extends into the channel. The first rod body has one end extending into the second rod body through the channel and is fixedly sleeved on the internal threaded sleeve. The circumference of the first rod body is provided with protrusions along its axial direction, and the protrusions slide in conjunction with the groove.

3. A linked bag support device for coal mine goaf areas according to claim 2, characterized in that, A limiting ring is fitted at one end of the first rod, and the outer diameter of the limiting ring is larger than the diameter of the channel.

4. A linked bag support device for coal mine goaf areas according to claim 2, characterized in that, The trigger switch is equipped with a delay circuit module.

5. A linked bag support device for coal mine goaf areas according to claim 1, characterized in that, The traction ropes are fixedly connected to the outer frame, and each traction rope is of the same length.

6. A linked baghouse support device for coal mine goaf areas according to claim 1, characterized in that, The telescopic frame is a square tube structure. The inner and outer frames of each telescopic frame are square tubes, and stabilizers are provided on the bottom outer side of each outer frame and the top outer side of each inner frame.

7. A linked baghouse support device for coal mine goaf according to claim 1, characterized in that, One pair of opposite sides of the inner skeleton are both first folding plates; the plates of the outer skeleton corresponding to the positions of the first folding plates are both second folding plates. Both the first and second folding plates include two plates connected by a folding axis, and the folding direction is towards the inside of the folding pouch.

8. A linked baghouse support device for coal mine goaf according to claim 7, characterized in that, A gap structure is configured between the two plates of the first folding plate and the folding shaft. The gap structure includes: two first connecting blocks symmetrically arranged on the outer circumferential surface of the folding shaft, each connecting block having a sliding groove, the sliding groove being a T-shaped channel; and two second connecting blocks respectively connected to one end of the plates of the first folding plate, each second connecting block having a T-shaped rod, the horizontal end of the T-shaped rod being inserted into the wide part of the T-shaped channel and confined within the T-shaped channel, the vertical part of the T-shaped rod slidingly engaging with the narrow groove of the T-shaped channel.

9. A linked bag support device for coal mine goaf according to claim 7, characterized in that, Also includes: The pulley, which is wrapped with a rubber ring, is mounted on the top of the plate on another pair of opposite sides of the inner frame away from the release end via a bracket. The pulley is rolled in the track groove of the release track. A limiter is installed on the inner wall of the track groove on one side of the release slide rail near the release end. The limiter is a limit block. The side of the limit block away from the release end is a slope. A channel is formed between the top of the limit block and the inner wall of the track groove opposite it. The rubber ring on the pulley can pass through the channel after being squeezed. The pre-break connector is a plastic connecting strip with a weak band in the middle. The two ends of the plastic connecting strip are respectively connected to the two plates of the first folded plate. The plastic connecting strip breaks from the weak band by external tension.

10. A method for linked bag support in a coal mine goaf, characterized in that, The support device according to any one of claims 1-9 includes the following steps: Multiple folding bags are installed sequentially on the release slide rail. Adjacent folding bags are connected by traction ropes. One end of the release slide rail is connected to the rear beam of the hydraulic support, and the other end serves as the release end, which is opposite to the direction of the working face's advance. After the hydraulic support moves forward, the folded bag closest to the release end falls off the release slide rail, the telescopic structure extends, drives the telescopic frame to extend and support between the goaf roof and the goaf floor, forming temporary support. At the same time, the bag unfolds synchronously with the telescopic frame. As the hydraulic support continues to move forward, for every distance the traction rope moves, a folded bag detaches from the release rail and forms temporary support between the top and bottom plates through the telescopic structure; multiple folded bags detach from the release rail in sequence and unfold in sequence to form a relay-type continuous temporary support belt. For folded bags that have been temporarily supported, filling grout is injected into the bag through the grouting port to form a solidified filling body.

Images