A gob-side entry retaining support device for improving recovery rate

Abstract

The application discloses a kind of along empty roadway supporting device of improving recovery rate, including support system, the support system includes frame body being connected to bottom plate by base block, and frame body is respectively correspondingly laid in the two sides of goaf, and it is equipped with the transverse sliding cavity being perpendicular to along empty roadway in frame body, and the transverse sliding block connected by spring one is sealed and slid on transverse sliding cavity, and the corresponding transverse sliding block of goaf two sides is connected by steel chain, and the upper end of frame body is equipped with vertical sliding cavity, and support device is installed in vertical sliding cavity, and the return air roadway of support system side and the goaf where steel chain is located are respectively filled with gangue, and the support system of along empty roadway side is additionally equipped with reinforcing device.

Description

Technical Field

[0001] This invention relates to the field of goaf retention support technology, specifically a goaf retention support device to improve the recovery rate. Background Technology

[0002] Traditional longwall mining requires leaving 10-30 meter wide coal pillars to support the roof, isolate the goaf, and prevent gas leakage. These pillars are often difficult to recover, leading to coal resource waste and reduced recovery rates. Goaf retention refers to preserving the haulage roadway from the previous mining face as the return airway for the next face. By reinforcing the roadway near the goaf on one side of the haulage roadway, it replaces the coal pillars in supporting the roadway roof, thus improving the coal recovery rate.

[0003] Currently, the goaf-side retainer is located at the edge of the goaf, directly bearing the complex mining pressure caused by the violent movement of the overlying strata and the compaction of goaf gangue. This includes the enormous, dynamic downward pressure and rockburst generated on the roof of the retainer during the collapse and settlement of the goaf roof. During the compaction of goaf gangue, the retainer's sidewalls are prone to strong lateral compression and expansion pressure, especially on the side closest to the goaf. Conventional rigid support structures are unable to adapt to the dynamically changing mining pressure, easily deforming, damaging, or even failing, leading to roadway cross-section contraction and affecting ventilation and safe operation.

[0004] Therefore, it is necessary to provide a goaf retention support device to improve the recovery rate and solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a goaf retention roadway support device for improving recovery rate, comprising a support system, wherein the support system includes a frame connected to a base plate via a base block, and the frame is respectively arranged on both sides of the goaf, the frame is provided with a transverse sliding cavity perpendicular to the goaf retention roadway, a transverse sliding block connected by a spring is sealed and slidably mounted on the transverse sliding cavity, and the transverse sliding blocks on both sides of the goaf are connected by a steel chain, the upper end of the frame is provided with a vertical sliding cavity, a support device is installed in the vertical sliding cavity, and the return airway on one side of the support system and the goaf where the steel chain is located are respectively filled with gangue, and a reinforcement device is also installed on the support system on the goaf retention roadway side.

[0006] Preferably, the support device includes a top block and an airbag frame. The top block is sealed and slides on the vertical sliding cavity. The airbag frame is sleeved on the outside of the frame. The horizontal sliding cavity is connected to a main channel. The main channel is connected to the vertical sliding cavity through a branch channel one. The main channel is connected to the airbag frame through a branch channel two.

[0007] Preferably, the reinforcing device includes a support plate fixed on the frame, a sliding column running vertically through the support plate, a carrier plate connected to the upper end of the sliding column, a hydraulic cylinder provided at the upper end of the carrier plate, a sliding plate slidably sleeved at the lower end of the sliding column, the sliding plate and the carrier plate being connected by a spring, a trapezoidal slider at the lower end of the sliding plate, and a push slider on the horizontal slider, the push slider having a trapezoidal sliding surface that cooperates with the trapezoidal slider to push and slide.

[0008] Preferably, the upper ends of the hydraulic cylinder and the top block are respectively provided with buffer top pads, the buffer top pads include a seat plate, the upper end of the seat plate is provided with a semi-circular protrusion, the top plate is rotatably sleeved on the semi-circular protrusion, and the two sides of the top plate are respectively connected to the seat plate by springs.

[0009] Preferably, a grouting pipe is provided on the frame located at the goaf retaining roadway. The grouting pipe extends laterally through the frame and horizontal slider on both sides of the goaf, and the grouting pipe wall located in the goaf is also provided with grout holes.

[0010] Preferably, a pressure regulating pipe is provided on the frame located at the goaf-retention roadway. The pressure regulating pipe passes through the horizontal sliding blocks on both sides of the goaf area and is connected to the horizontal sliding cavity on the side of the return air roadway.

[0011] Preferably, the end face of the horizontal slider near the goaf side has an obtuse angle with the horizontal plane of the goaf side.

[0012] Preferably, at least two steel chains are configured between the corresponding transverse sliders on both sides of the goaf.

[0013] Preferably, the lower end of the frame is provided with a bottom groove, and the frame is also provided with a grouting channel connected to the bottom groove, and the bottom plate is provided with a grouting tank corresponding to the bottom groove.

[0014] Preferably, the bottom of the groove is provided with a plurality of vertical ribs.

[0015] Compared with the prior art, the present invention provides a gob-side roadway support device to improve the recovery rate, which has the following beneficial effects:

[0016] In this invention, the device, in conjunction with a mixed filler of gangue, is used to fill the edge and goaf of the goaf, achieving effective support and isolation of the goaf. This replaces the traditional pre-reserved section coal pillars, increasing the amount of coal resources recovered and thus improving the recovery rate. The steel chain and spring are designed to buffer the impact, with the horizontal sliders on both sides of the goaf connected by the steel chain and containing the spring. When the roof sinks and impacts the steel chain, the steel chain deforms and tightens, while the spring is compressed or stretched. This effectively absorbs and buffers the impact energy generated by the roof sinking, significantly reducing the instantaneous peak load acting on the support frame, preventing the support structure from being damaged by the impact, efficiently buffering the impact pressure, and dynamically adapting to the roof movement.

[0017] In this invention, the deformation of the steel chain and the movement of the horizontal slider can transmit and converge the uneven pressure above the goaf to the central area of ​​the goaf, reducing the direct pressure on the roof directly above the goaf roadway. At the same time, the pulling force of the steel chain on the horizontal slider and the lateral thrust of the roof on the horizontal slider mutually restrain each other, slowing down the speed and magnitude of roof subsidence. When the horizontal slider moves, the design of the push slider and trapezoidal slider converts the movement into an upward force on the sliding plate, compressing the spring and ultimately transmitting it upward through the hydraulic cylinder, enhancing the support strength of the roof of the roadway on the side of the goaf roadway, and converting lateral pressure into a supporting effect. This helps to resist the lateral expansion pressure caused by the compaction of gangue in the goaf, maintain the stability of the roadway side, enhance the support strength of the side of the goaf roadway, and resist lateral pressure.

[0018] In this invention, the hydraulic cylinder and the buffer pad at the top of the support block allow the roof to rotate slightly and shift under impact loads, further dissipating impact energy, improving the adaptability of the support system to non-uniform loads, and maintaining support stability. Through the integrated airbag frame, the horizontal sliding cavity, vertical sliding cavity, and airbag frame are uniformly pressurized through the main channel and branch channels. The airbag frame can effectively seal the gaps between the roof block and the roof plate, between roof blocks, and between the roof block / frame and the bottom plate, forming a reliable isolation barrier to prevent harmful gases such as gas from the goaf from leaking into the goaf-side roadway, thus ensuring operational safety.

[0019] In this invention, grout can be injected into the filled gangue area through the grouting pipe, which consolidates the loose filling into a more integrated structure, significantly improving its bearing capacity and roof support effect, reducing later compression deformation, and facilitating later reinforcement grouting repair of the filling, maintaining the long-term stability of the goaf roadway. The setting of the pressure regulating pipe allows the air pressure of the two transverse sliding chambers to be adjusted according to the mine pressure manifestation during the operation of the support system, balancing the support state on both sides of the goaf, optimizing the stress on the steel chain, reducing the adverse effects on the goaf roadway side, and improving the adaptability and reliability of the entire support system. The bottom of the frame is grouted and consolidated with the bottom plate through the bottom trench, grout tank and grouting channel. With the convex ribs in the bottom trench, strong pull-out and shear resistance is provided to ensure the stability of the entire support system under dynamic mine pressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the goaf-keeping support device of the present invention;

[0021] Figure 2 This is a schematic diagram of a partial structure of the base plate;

[0022] Figure 3 This is a schematic diagram of the support system structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the push-slide structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the vertical sliding cavity structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the rib structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the grouting pipe structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the support device structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the enhancement device structure of the present invention;

[0029] Figure 10 This is a schematic diagram of the airbag frame structure of the present invention;

[0030] In the diagram: 1. Longwall face; 2. Return airway; 3. Transport roadway; 4. Goaf retainer; 5. Goaf; 6. Support system; 7. Gangue; 8. Reinforcing device; 9. Floor; 10. Buffer roof pad; 61. Frame; 62. Horizontal sliding block; 63. Steel chain; 64. Spring 1; 65. Support device; 66. Grouting pipe; 67. Pressure regulating pipe; 611. Horizontal sliding cavity; 612. Main channel; 613. Tributary channel 1; 614. Tributary channel 2; 615. Vertical sliding cavity; 616, bottom groove; 617, protruding rib; 618, grouting channel; 641, pusher block; 642, trapezoidal sliding surface; 651, top block; 652, airbag frame; 661, grout hole; 81, support plate; 82, sliding column; 83, carrier plate; 84, spring two; 85, sliding plate; 86, trapezoidal slider; 87, hydraulic cylinder; 91, grout tank; 92, base block; 101, seat plate; 102, semi-circular protruding column; 103, top plate; 104, spring three. Detailed Implementation

[0031] Reference Figures 1-10 This invention provides a technical solution: a goaf retention roadway support device for improving recovery rate, comprising a support system 6, wherein the support system 6 includes a frame 61 connected to a base plate 9 via a base block 92, and the frame 61 is respectively arranged on both sides of the goaf 5. The frame 61 is provided with a transverse sliding cavity 611 perpendicular to the goaf retention roadway 4, and a transverse sliding block 62 connected by a spring 64 is sealed and slidably mounted on the transverse sliding cavity 611. The transverse sliding blocks 62 on both sides of the goaf 5 are connected by a steel chain 63. The upper end of the frame 61 is provided with a vertical sliding cavity 615, in which a support device 65 is installed. The return airway 2 on one side of the support system 6 and the goaf 5 where the steel chain 63 is located are respectively filled with gangue 7, and a reinforcement device 8 is also installed on the support system 6 on one side of the goaf retention roadway 4.

[0032] During coal mining, return airway 2 and transport roadway 3 are respectively set on both sides of the longwall face 1. As mining progresses, a goaf 5 is formed behind the longwall face 1. By installing a support system 6 and filling it with gangue 7 in the goaf 5, the transport roadway 3 located in the goaf 5 area is retained, forming a goaf retainer roadway, which serves as the roadway for the next coal mining face. This avoids reserving section coal pillars to support the roof, isolate the goaf, and prevent gas leakage, thereby improving the coal recovery rate. However, as the goaf 5 increases in size, the downward pressure on the roof of the roadway above the goaf 5 also increases, making it prone to collapse and other situations, and easily causing large lateral tension pressure on the sides of the goaf retainer roadway 4.

[0033] In this embodiment, the frame 61 is connected and fixed to the base plate 9, serving as a fixed support for the horizontal direction on the side of the goaf 5 and the vertical direction on the side of the goaf-side roadway 4. Through the setting of the horizontal slider 62, steel chain 63 and spring 64, the fall of the roadway roof above the goaf 5 will act on the steel chain 63, causing the chain of the steel chain 63 to contract downward and towards the center, which can buffer the fall of the roadway roof and effectively reduce the impact pressure generated by the roadway roof. The two ends of the steel chain 63 have a pulling effect on the horizontal slider 62. At the same time, the fall of the roadway roof also has a lateral pushing effect on the horizontal slider 62, which can tension the steel chain 63. This can effectively slow down the fall of the roadway roof and reduce the amplitude of the fall, thereby reducing the instantaneous impact force on the frame 61 and improving the support strength of the frame 61.

[0034] In addition, during the filling process of gangue 7, it is not limited to filling with fine sand, gravel, mud and other materials, which are mixed with gangue 7 to form a mixed filling body. As the roadway roof falls and the deformation and support effect of steel chain 63, it can effectively concentrate the force on the goaf to the center of the goaf, thereby reducing the pressure on the roadway above the goaf. At the same time, the force on the center of steel chain 63 can slowly increase the pulling force on both ends of steel chain 63, thereby comprehensively reducing the pressure on the top and sides of frame 61, and thus improving the safety of the roadway support.

[0035] In this embodiment, the support device 65 includes a top block 651 and an airbag frame 652. The top block 651 is sealed and slides on the vertical sliding cavity 615. The airbag frame 652 is fitted over the frame 61. The horizontal sliding cavity 611 is connected to the main channel 612. The main channel 612 is connected to the vertical sliding cavity 615 through a first branch channel 613. The main channel 612 is connected to the airbag frame 652 through a second branch channel 614. The airbag frame 652 is used to seal the gaps between adjacent top blocks 651, between top blocks 651 and the roadway roof, and between top blocks 651 and the floor 9, to prevent gas leakage between the goaf and the goaf-side roadway 4. In this embodiment, the upper and lower ends of the airbag frame 652 are respectively provided with an upper airbag opening and a lower airbag opening. The upper airbag opening is used to fit over the outside of the top block 651 to ensure the sealing between the top block 651 and the tunnel roof. The lower airbag opening is used to fit over the outside of the base block 92 to ensure the sealing between the base block 92, the frame 61 and the bottom plate 9. The side airbag surfaces of the airbag frame 652 are used to ensure the sealing between adjacent top blocks 651. Specifically, the main channel 612 is used to inflate and pressurize the transverse sliding cavity 611, the vertical sliding cavity 615, and the airbag frame 652 as a whole. It should be noted that during the installation of the goaf-side retaining roadway support in the goaf 5, the support system 6 is installed first. After the installation is completed, there is a large space in the goaf 5 section where the support system 6 is located, the return airway 2 corresponding to the goaf 5 section, and the goaf-side retaining roadway 4 corresponding to the goaf 5, which facilitates construction operations. This allows the main channel 612 to inflate and pressurize the transverse sliding cavity 611, the vertical sliding cavity 615, and the airbag frame 652 as a whole, and to seal the main channel 612 before filling it with gangue 7.

[0036] In this embodiment, the reinforcing device 8 includes a support plate 81 fixed to the frame 61. A sliding column 82 extends vertically through the support plate 81. A carrier plate 83 is connected to the upper end of the sliding column 82. A hydraulic cylinder 87 is installed at the upper end of the carrier plate 83. A sliding plate 85 is slidably fitted onto the lower end of the sliding column 82. The sliding plate 85 is connected to the carrier plate 83 by a spring 84. A trapezoidal slider 86 is provided at the lower end of the sliding plate 85. A pusher slider 641 is provided on the horizontal slider 62. The pusher slider 641 has a trapezoidal sliding surface 642 that cooperates with the trapezoidal slider 86 to push and slide. That is, when the horizontal slider 62 moves, it can drive the pusher slider 641 to move. The pusher slider 641 can push the trapezoidal slider 86 upward, thereby increasing the pressure on the sliding plate 85 and strengthening the support strength of the hydraulic cylinder 87 for the tunnel roof. It needs to be explained here that when the roof of the roadway and the filling material in the goaf subside, due to the flow, rolling, and compression of materials such as gangue and fine sand, the pressure on each section of the support system 6 will vary depending on the monitoring and analysis along the straight direction of the goaf retaining roadway. The horizontal slider 62 exhibits two movement scenarios: Scenario 1: If the force exerted on the steel chain 63 above the local goaf 5 is greater than the lateral force on the horizontal slider 62, then the horizontal slider 62 will slightly shift towards the goaf 5. Scenario 2: If the local... The force exerted on the steel chain 63 above the goaf 5 is less than the lateral force exerted on the horizontal slider 62. As a result, the horizontal slider 62 moves slightly in the opposite direction to the goaf 5. Therefore, when the horizontal slider 62 moves, it can drive the trapezoidal slider 86 to move upward, thereby strengthening the support strength of the roadway roof side of the goaf-side roadway 4 near the goaf through the buffer top pad 10. In addition, when the pressure on the goaf is as described in Situation 1 and Situation 2, the flexible concave curvature of the steel chain 63 can effectively resist the falling effect of the roadway roof.

[0037] In this embodiment, the upper ends of the hydraulic cylinder 87 and the top block 651 are respectively provided with buffer pads 10. The buffer pads 10 include a seat plate 101, and a semi-circular protrusion 102 is provided at the center of the upper end of the seat plate 101. A top plate 103 is rotatably sleeved on the semi-circular protrusion 102. The two sides of the top plate 103 are connected to the seat plate 101 by springs 104. The axial direction of the semi-circular protrusion 102 is the same as the direction of the goaf retaining roadway 4. Therefore, when there is a rockburst on the roadway roof, the impact on the buffer pads 10 can be buffered by the action of the springs 104, thereby improving the stability of the goaf retaining roadway 4 support.

[0038] In this embodiment, a grouting pipe 66 is provided on the frame 61 located at the goaf retaining roadway 4. The grouting pipe 66 transversely penetrates the frame 61 and the horizontal slider 62 on both sides of the goaf 5, and the grouting pipe 66 located in the goaf also has grout holes 661 on its wall. In this embodiment, the grouting pipe 66 is sealed and slidably connected to the horizontal slider 62 and the frame 61 located on the goaf retaining roadway 4, and a certain protrusion of the pipe body is reserved to prevent the grouting pipe 66 from extending into the goaf. The grouting pipe 66 is fixedly connected to the horizontal slider 62 and the frame 61 located on the return airway 2 to accommodate the sliding displacement difference between the two corresponding horizontal sliders 62. In addition, during the installation of the aforementioned support system 6, after the gangue 7 is filled, grouting is performed through the grouting pipe 66 to fill the gangue area and the goaf area of ​​the return airway 2 section, thereby improving the compactness of the gangue filling in the goaf area, and thus improving the support strength of the goaf area and the goaf-side roadway. Furthermore, it facilitates the subsequent grouting and repair of the gangue area and the goaf area of ​​the return airway 2 section, thereby ensuring the support strength of the goaf-side roadway.

[0039] In this embodiment, a pressure regulating pipe 67 is provided on the frame 61 located at the goaf retaining roadway 4. The pressure regulating pipe 67 passes through the horizontal sliding blocks 62 on both sides of the goaf area and is connected to the horizontal sliding cavity 611 on the side of the return air roadway 2. That is to say, when the air pressure of the horizontal sliding cavity 611 and the vertical sliding cavity 615 in the return air roadway 2 section is abnormal, the pressure regulating pipe 67 can adjust the support strength of the two frames 61 on both sides of the goaf area 5 in a timely manner, so as to adjust the force of the roadway roof on the goaf area below in the section where the steel chain 63 acts. That is, by increasing or decreasing the support strength of its position on the goaf area, the support strength on both sides of the goaf area is relatively balanced, reducing the lateral pressure of the goaf retaining roadway 4 on the side close to the goaf area, and improving the support stability and safety of the goaf retaining roadway 4. In this embodiment, the pressure regulating pipe 67 is sealed and slidably connected to the horizontal slider 62 and frame 61 located on the side of the goaf roadway 4 to prevent the pressure regulating pipe 67 from extending into the goaf area. The grouting pipe 66 is fixedly connected to the horizontal slider 62 and frame 61 located on the side of the return air roadway 2 to accommodate the sliding displacement difference between the two corresponding horizontal sliders 62.

[0040] In this embodiment, the end face of the horizontal slider 62 near the goaf 5 is at an obtuse angle to the horizontal plane of the goaf 5, so that the force of the goaf can be better fed back to the horizontal slider 62. At the same time, it is beneficial to concentrate the force above the goaf towards the center.

[0041] In this embodiment, at least two steel chains 63 are configured between the horizontal sliders 62 on both sides of the goaf 5 to provide stability for the gangue.

[0042] In this embodiment, the lower end of the frame 61 is provided with a bottom groove 616, and the frame 61 is also provided with a grouting channel 618 connected to the bottom groove 616. The bottom plate 9 is provided with a grout receiving groove 91 corresponding to the bottom groove 616. That is to say, in the process of laying the support system 6, the grout receiving groove 91 is first opened on the bottom plate 9, and then the bottom groove 616 is aligned with the grout receiving groove 91. Grouting is then performed through the grouting channel 618. After the grout solidifies, the frame 61 and the bottom plate 9 can be connected and fixed in place.

[0043] In this embodiment, the bottom of the groove 616 is provided with a plurality of vertical ribs 617 to enhance the connection strength between the frame 61 and the base plate 9.

[0044] In its specific implementation, it includes the following steps:

[0045] S1: Grouting tanks 91 are opened on both sides of the goaf 5;

[0046] S2: Align the bottom groove 616 at the lower end of the frame 61 with the grout tank 91, and grout is injected and solidified through the grouting channel 618;

[0047] S3: Install pressure regulating pipe 67, grouting pipe 66 and steel chain 63;

[0048] S4: Inflate and pressurize through the main channel 612 to complete the sealing and support of the frame 61, the tunnel roof and floor 9;

[0049] S5: Fill the return airway 2 and the goaf 5 section where the steel chain 63 is located with gangue 7 respectively;

[0050] S6: Grouting and solidification are carried out in the section where gangue 7 is located through grouting pipe 66 to complete the support of the goaf retaining roadway 4.

[0051] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gob-side roadway support device for improving recovery rate, comprising a support system (6), characterized in that, The support system (6) includes a frame (61) connected to the base plate (9) via a base block (92), and the frame (61) is respectively arranged on both sides of the goaf (5). The frame (61) is provided with a horizontal sliding cavity (611) perpendicular to the goaf roadway (4). A horizontal sliding block (62) connected by a spring (64) is sealed and slidable on the horizontal sliding cavity (611). The horizontal sliding blocks (62) on both sides of the goaf (5) are connected by a steel chain (63). A vertical sliding cavity (615) is provided at the upper end of the frame (61). A support device (65) is installed in the vertical sliding cavity (615). The return air roadway (2) on one side of the support system (6) and the goaf (5) where the steel chain (63) is located are respectively filled with gangue (7). A reinforcement device (8) is also installed on the support system (6) on the side of the goaf roadway (4). The reinforcing device (8) includes a support plate (81) fixed on the frame (61), a sliding column (82) running vertically through the support plate (81), a carrier plate (83) connected to the upper end of the sliding column (82), a hydraulic cylinder (87) provided at the upper end of the carrier plate (83), a sliding plate (85) slidably sleeved at the lower end of the sliding column (82), the sliding plate (85) and the carrier plate (83) being connected by a spring (84), a trapezoidal slider (86) provided at the lower end of the sliding plate (85), and a pusher (641) provided on the horizontal slider (62), and a trapezoidal sliding surface (642) provided on the pusher (641) to cooperate with the trapezoidal slider (86) to push and slide.

2. The gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, The support device (65) includes a top block (651) and an airbag frame (652). The top block (651) is sealed and slides on the vertical sliding cavity (615). The airbag frame (652) is fitted on the outside of the frame (61). The horizontal sliding cavity (611) is connected to the main channel (612). The main channel (612) is connected to the vertical sliding cavity (615) through a branch channel one (613). The main channel (612) is connected to the airbag frame (652) through a branch channel two (614).

3. The gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, The upper ends of the hydraulic cylinder (87) and the top block (651) are respectively provided with buffer top pads (10). The buffer top pads (10) include a seat plate (101). A semi-circular protrusion (102) is provided at the center of the upper end of the seat plate (101). A top plate (103) is rotatably sleeved on the semi-circular protrusion (102). The two sides of the top plate (103) are connected to the seat plate (101) by springs (104).

4. A gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, A grouting pipe (66) is provided on the frame (61) located at the goaf (4). The grouting pipe (66) passes through the frame (61) and the horizontal slider (62) on both sides of the goaf (5). The grouting pipe (66) located at the goaf is also provided with grout holes (661) on its pipe wall.

5. A gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, A pressure regulating pipe (67) is provided on the frame (61) located at the goaf (4). The pressure regulating pipe (67) passes through the horizontal sliding block (62) on both sides of the goaf area and is connected to the horizontal sliding cavity (611) on the side of the return air roadway (2).

6. A gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, The end face of the horizontal slider (62) near the goaf (5) has an obtuse angle with the horizontal plane of the goaf (5).

7. A gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, At least two steel chains (63) are configured between the corresponding horizontal sliders (62) on both sides of the goaf (5).

8. A gob-side roadway support device for improving recovery rate according to claim 1, characterized in that, The frame (61) is provided with a bottom groove (616) at the lower end, and the frame (61) is also provided with a grouting channel (618) connected to the bottom groove (616). The bottom plate (9) is provided with a grouting tank (91) corresponding to the bottom groove (616).

9. A gob-side roadway support device for improving recovery rate according to claim 8, characterized in that, The bottom of the groove (616) is provided with multiple vertical ribs (617).

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