Coal mine stope face corner top plate supporting device based on anchor bolt composite structure

Abstract

The invention discloses a coal mine stope face corner top plate supporting device based on an anchor bolt composite structure. The coal mine stope face corner top plate supporting device comprises a supporting body, a fixing assembly, a buffering assembly and a rockfall protection assembly. The supporting main body is cooperatively matched with the fixing assembly, so that the device is stably positioned and mounted in a corner area of a coal mine stope face; the buffering assembly is assembled between the supporting bodies in a detachable connection mode and used for buffering pressure loads in the top plate supporting process. The rockfall protection assembly is correspondingly assembled on the buffering assembly so as to intercept rockfall in the supporting area, and operation safety is guaranteed. According to the coal mine stope face corner top plate supporting device based on the anchor bolt composite structure, through cooperative cooperation of the supporting body, the fixing assembly, the buffering assembly and the falling rock protection assembly, stable positioning, efficient pressure buffering and safe falling rock interception of the corner top plate are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a coal mining working face corner roof supporting device based on an anchor bolt composite structure. BACKGROUND

[0002] In the process of coal mining, the corner roof support of the mining working face has always been a difficult problem. In the past, single anchor rod support or shed support and other methods have been used. However, these traditional support methods have certain limitations when facing complex geological conditions and large mining pressure. For example, single anchor rod support may not effectively resist the subsidence and deformation of the roof, while shed support has problems such as great construction difficulty and high material consumption.

[0003] With the increase of coal resource mining intensity, mine coal resources are gradually exhausted, and the recovery of corner coal becomes particularly important. When corner coal is mined, one side of the working face is a goaf, and the other side may be an oxidized zone, which leads to an increase in the degree of mine pressure on both sides of the working face, and the advanced influence range of the support pressure of the mining roadway increases significantly, and the deformation amount and deformation rate of the surrounding rock also increase. In this case, the traditional support method cannot meet the support needs of the corner roof, and problems such as coal wall spalling, end face roof falling and support overloading are prone to occur.

[0004] Based on this, the present application provides a coal mining working face corner roof supporting device based on an anchor bolt composite structure. SUMMARY

[0005] The present application aims to provide a coal mining working face corner roof supporting device based on an anchor bolt composite structure to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a coal mining working face corner roof supporting device based on an anchor bolt composite structure, comprising a support main body, a fixing assembly, a buffer assembly and a rockfall protection assembly; the support main body and the fixing assembly cooperate to realize stable positioning and installation of the device in the corner area of the coal mining working face; the buffer assembly is assembled between the support main bodies by a detachable connection method, and is used to buffer the pressure load in the roof support process; the rockfall protection assembly is assembled on the buffer assembly to intercept the rockfall in the support area and ensure the safety of the operation.

[0007] Preferably, the support body comprises two adjustable telescopic rods, the two ends of the two adjustable telescopic rods are rotatably provided with a first metal plate and a second metal plate for closely fitting the wall top and the wall fixing surface; the adjustable telescopic rod is provided with a limiting bolt, the telescopic part of the adjustable telescopic rod can be locked by tightening the limiting bolt, and the support span can be flexibly adjusted; the top of the two adjustable telescopic rods is fixedly provided with two mounting blocks, and the mounting block is integrated with a fixing structure for connecting the buffer assembly.

[0008] By adopting the above technical scheme, the telescopic characteristics of the adjustable telescopic rod can be flexibly adapted to the corner area of the coal mining face of different sizes, the limiting bolt can quickly lock the telescopic part, and the support span after adjustment is stable and unchanged. The first metal plate and the second metal plate can closely fit the wall top and the wall fixing surface, the contact area of the support body and the surrounding rock is improved, and the mounting block provides a stable and convenient connection basis for the buffer assembly, so that the modular assembly of the whole support device is more efficient.

[0009] Preferably, the fixing assembly comprises a positioning anchor bolt, four positioning anchor bolts are threadedly installed on the first metal plate and the second metal plate; the two second metal plates are fastened to the wall top through the corresponding positioning anchor bolts, and the first metal plate is stably fixed to the wall through the corresponding positioning anchor bolts, so as to realize reliable positioning of the support body in the corner area.

[0010] By adopting the above technical scheme, the eight positioning anchor bolts correspondingly fix the first metal plate and the second metal plate, can firmly anchor the support body on the wall top and the wall, and greatly improve the installation stability of the device in the corner area. The threaded connection not only ensures the connection strength, but also facilitates installation and disassembly during construction, effectively avoids displacement of the device due to insecure fixation during support, and provides reliable protection for subsequent buffer and protection functions.

[0011] Preferably, the buffer assembly comprises two fixed blocks, the two fixed blocks are correspondingly arranged between the two adjustable telescopic rods; the two sides of each fixed block are slidably provided with a movable block, and a center block is fixedly installed in the fixed block; one end of the movable block is fixedly connected with a connecting block, two metal blocks are fixedly installed on the connecting block, and the metal blocks and the mounting blocks are one-to-one correspondingly arranged; the two sides of the metal blocks and the mounting blocks can be stably connected through the fixing structure on the mounting block, and the assembly and fixation of the buffer assembly and the support body are realized.

[0012] Using the above technical solution, the corresponding arrangement of the fixed block and the adjustable telescopic rod forms a stable buffer installation frame, and the sliding cooperation between the movable block and the fixed block provides space for pressure transmission. The one-to-one correspondence design between the metal block and the installation block, together with the fixing structure on the installation block, achieves precise docking and stable fixation between the buffer component and the support body, ensuring that the buffering force can be effectively transmitted. At the same time, the detachable assembly method also facilitates later maintenance and replacement of parts.

[0013] Preferably, the fixing structure on the mounting block includes a knob, a locking bolt, a rack, a gear, a double-acting lead screw, a lead screw guide sleeve, a crossbar, and a limiting block. The locking bolt is threaded vertically onto the top of the mounting block, and the knob is correspondingly fixedly sleeved on the top of the locking bolt, forming a drive structure that is easy to operate. One end of the rack is rotatably connected to the bottom end of the locking bolt, and the other end is slidably fitted inside the mounting block, allowing vertical displacement as the locking bolt rotates. The double-acting lead screw is rotatably fitted horizontally into the mounting block, with two lead screw guide sleeves threaded onto the double-acting lead screw, and a gear meshing with the rack is fixedly fitted in the middle of the double-acting lead screw. Crossbars are slidably fitted horizontally on both sides of the mounting block, with one end of each crossbar fixedly connected to two lead screw guide sleeves, and the other end fixedly fitted with a limiting block. A limiting groove adapted to the limiting block is provided on the metal block, and the metal block is securely fixed to the mounting block by the engagement of the limiting block into the limiting groove.

[0014] By adopting the above technical solution, the simple operation of driving the locking bolt with a knob can drive the rack, gear and double lead screw to move synchronously in opposite directions, so as to quickly complete the engagement or disengagement with the metal block limit groove. The cooperation between the slide rail and the slider ensures the smooth movement of the lead screw guide sleeve and the crossbar. The return spring can assist the limit block to quickly return to its original position when unlocking. The whole structure is easy to operate and locks firmly, which greatly improves the assembly efficiency and connection reliability of the buffer component and the support body.

[0015] Preferably, a connecting rod is fixedly connected to the end of the movable block away from the connecting block; a damping block is fixedly installed between each connecting rod and the corresponding center block, and two buffer springs are symmetrically fixedly installed between the connecting rod and the inner wall of the fixed block; at the same time, two support connecting rods are also hinged between the connecting rod and the corresponding center block, and a highly efficient buffer structure is formed through the synergistic effect of the damping block, buffer springs and support connecting rods.

[0016] Using the above technical solution, the buffer spring can quickly absorb the instantaneous pressure transmitted from the roof, the damping block can slow down the pressure transmission speed and consume impact energy, and the support linkage further disperses the pressure through hinged rotation. The three work together to form a multi-stage buffer system. This design can effectively reduce the impact of roof pressure on the support device, reduce the impact of surrounding rock deformation, and significantly improve the device's adaptability to complex geological conditions and high mining pressure.

[0017] Preferably, the rockfall protection component includes a rockfall interception net, with a U-shaped block fixedly installed on the top of each of the four connecting blocks; each U-shaped block has a tightening bolt threaded on both sides, the tightening bolt being used to lock and fix the mounting plate; the tops of the four mounting plates are fixedly connected to the rockfall interception net to form a protective system covering the area below the support, and multiple ventilation holes are evenly provided on the rockfall interception net.

[0018] Using the above technical solution, the rockfall interception net can be firmly fixed to the top of the connecting block through the cooperation of U-shaped blocks, clamping bolts, and mounting plates, forming a protective barrier that fully covers the area below the support. The design of the ventilation holes ensures smooth ventilation in the support area without affecting the rockfall interception effect, avoiding ventilation obstruction caused by the protective structure. At the same time, the detachable fixing method facilitates the replacement and maintenance of the rockfall interception net, fully ensuring the safety of the workers.

[0019] Preferably, two connecting telescopic rods are threadedly installed between the two fixed blocks.

[0020] By adopting the above technical solution, two connecting telescopic rods securely connect the two fixed blocks, enhancing the overall integrity and structural rigidity of the buffer assembly. Their expandable nature can accommodate slight deformation of the buffer assembly under pressure, avoiding structural damage caused by rigid connections. Simultaneously, it improves the buffer assembly's adaptability to different support spans, making the entire buffer system more uniformly stressed and more stable.

[0021] Preferably, a return spring is sleeved on each crossbar, one end of each return spring is fixed to the corresponding crossbar, and the other end of each return spring is fixed to the corresponding mounting block. A slide rail is fixedly installed inside each mounting block, and two sliders are slidably installed on each slide rail. Each slider is fixedly connected to the corresponding lead screw guide sleeve.

[0022] By adopting the above technical solution, the return spring can provide reset force after the crossbar moves, ensuring that the limit block quickly returns to its initial position when unlocked, facilitating the disassembly and reassembly of the buffer assembly. The cooperation between the slide rail and the slider limits the movement trajectory of the lead screw guide sleeve, preventing deviation when the bidirectional lead screw rotates, ensuring the accuracy of the connection between the limit block and the limit groove, and further improving the operational stability and service life of the mounting block fixing structure.

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. Strong positioning stability: The adjustable telescopic rod adapts to different corner sizes, and the positioning anchor bolts are used to fasten the metal plate to the top of the wall and the wall. Then, the installation block structure locks the buffer component, so as to realize the modular and precise fixing of the device and facilitate installation and disassembly.

[0024] II. High-efficiency pressure buffering: The buffer assembly, with the help of buffer springs, damping blocks and support rods, absorbs and disperses the pressure on the roof plate. The connecting telescopic rods enhance the overall integrity of the assembly and reduce the impact of surrounding rock deformation.

[0025] III. Comprehensive Safety Protection: The rockfall interception net is fixed with U-shaped blocks and clamping bolts, covering the area below the support to intercept falling rocks, while ventilation holes ensure ventilation and build a safety barrier. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the present invention regarding two adjustable telescopic rods; Figure 3 This is a perspective view of the mounting block according to the present invention; Figure 4 This is a perspective view of the internal structure of the mounting block according to the present invention; Figure 5 This is a perspective view of the internal structure of the fixing block according to the present invention.

[0027] In the diagram: 1. Adjustable telescopic rod; 2. Limiting bolt; 3. First metal plate; 4. Ventilation hole; 5. Rockfall interception net; 6. Positioning anchor bolt; 7. Second metal plate; 8. Connecting telescopic rod; 9. Metal block; 10. Fixing block; 11. Knob; 12. Limiting groove; 13. Connecting block; 14. Limiting block; 15. Locking bolt; 16. Two-way lead screw; 17. Return spring; 18. Lead screw guide sleeve; 19. Gear; 20. Slide rail; 21. Crossbar; 22. Rack; 23. Buffer spring; 24. Pressing bolt; 25. Movable block; 26. Support connecting rod; 27. Damping block; 28. Mounting plate; 29. ​​U-shaped block; 30. Connecting rod; 31. Center block; 32. Mounting block. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-5This invention provides a technical solution: a roof support device for the corner of a coal mine longwall face based on an anchor bolt composite structure, comprising a support body, a fixing component, a buffer component, and a rockfall protection component; the support body and the fixing component work together to achieve stable positioning and installation of the device in the corner area of ​​the coal mine longwall face; the buffer component is assembled between the support bodies through a detachable connection to buffer the pressure load during the roof support process; the rockfall protection component is correspondingly assembled on the buffer component to intercept falling rocks in the support area and ensure operational safety.

[0030] Combination Figures 1-5 As shown, in this embodiment, the support body includes two adjustable telescopic rods 1. A first metal plate 3 and a second metal plate 7 are rotatably mounted at both ends of the two adjustable telescopic rods 1 to fit against the wall top and the wall's fixed surface, respectively. Limiting bolts 2 are provided on the adjustable telescopic rods 1. By tightening the limiting bolts 2, the telescopic portion of the adjustable telescopic rod 1 can be locked, thereby flexibly adjusting the support span. The fixing assembly includes positioning anchors 6. Four positioning anchors 6 are threadedly installed on both the first metal plate 3 and the second metal plate 7. The two second metal plates 7 are securely connected to the wall top through corresponding positioning anchors 6, and the first metal plate 3 is firmly fixed to the wall through corresponding positioning anchors 6, thus achieving reliable positioning of the support body in the corner area.

[0031] In this embodiment, the support body includes two adjustable telescopic rods 1. These two adjustable telescopic rods 1 are designed to flexibly adapt to different sizes of coal mine longwall face corner areas. During use, the support span is adjusted by stretching or shortening their telescopic portions. After adjustment, the limiting bolts 2 mounted on the adjustable telescopic rods 1 are tightened. The limiting bolts 2 lock the telescopic portions of the adjustable telescopic rods 1 in place, ensuring the support span remains stable after adjustment. A first metal plate 3 and a second metal plate 7 are rotatably mounted at both ends of the two adjustable telescopic rods 1. The first metal plate 3 is used to adhere to the wall fixing surface, and the second metal plate 7 is used to adhere to the top of the wall. The design increases the contact area between the support structure and the surrounding rock, making the fixation more stable. The rotating installation method allows them to better fit the wall and ceiling surfaces at different angles. The fixing components include positioning anchors 6. Four positioning anchors 6 are threadedly installed on the first metal plate 3 and the second metal plate 7. The purpose of the positioning anchors 6 is to firmly fix the support structure in the corner area. In use, the two second metal plates 7 are fastened to the top of the wall through the corresponding positioning anchors 6, and the first metal plate 3 is firmly fixed to the wall through the corresponding positioning anchors 6. The threaded connection method not only ensures the connection strength, but also facilitates installation and disassembly, ultimately achieving reliable positioning of the support structure in the corner area.

[0032] Combination Figures 1-5As shown, in this embodiment, two mounting blocks 32 are fixedly installed on the top of each of the two adjustable telescopic rods 1. The mounting blocks 32 integrate a fixing structure for connecting the buffer assembly. The buffer assembly includes two fixed blocks 10, which are correspondingly positioned between the two adjustable telescopic rods 1. Two connecting telescopic rods 8 are threaded between the two fixed blocks 10. Movable blocks 25 are slidably mounted on both sides of each fixed block 10, and a center block 31 is fixedly installed inside each fixed block 10. A connecting block 13 is fixedly connected to one end of each movable block 25, and two metal blocks 9 are fixedly installed on the connecting block 13, with each metal block 9 corresponding to one of the mounting blocks 32. The installation is configured such that the metal blocks 9 on both sides can be securely connected to the installation block 32 through the fixing structure on the mounting block 32, thereby realizing the assembly and fixing of the buffer component and the support body; a connecting rod 30 is fixedly connected to the end of the movable block 25 away from the connecting block 13; a damping block 27 is fixedly installed between each connecting rod 30 and the corresponding center block 31, and two buffer springs 23 are symmetrically fixedly installed between the connecting rod 30 and the inner wall of the fixed block 10; at the same time, two support connecting rods 26 are also hinged between the connecting rod 30 and the corresponding center block 31. Through the synergistic effect of the damping block 27, the buffer springs 23 and the support connecting rods 26, a highly efficient buffer structure is formed.

[0033] In this embodiment, the tops of the two adjustable telescopic rods 1 are each fixedly equipped with two mounting blocks 32. The mounting blocks 32 provide connection points for the buffer assembly, and their integrated fixing structure ensures a stable connection between the buffer assembly and the supporting body. The buffer assembly includes two fixing blocks 10, which are correspondingly positioned between the two adjustable telescopic rods 1. These blocks form the frame of the buffer assembly. Two connecting telescopic rods 8 are threaded between the two fixing blocks 10. These connecting telescopic rods 8 enhance the overall integrity of the buffer assembly, and their expandable nature accommodates slight deformation under pressure, preventing rigid breakage. Each fixing block 10 has a movable block 25 slidably mounted on both sides. The movable blocks 25 transmit pressure from the top plate and provide buffer movement space. The central block 31 fixedly installed inside the fixing block 10 serves as the fixing base point of the buffer structure. A connecting block 13 is fixedly connected to one end of the movable block 25. The purpose is to connect the movable block 25 and the metal block 9. The two metal blocks 9 fixedly installed on the connecting block 13 correspond one-to-one with the mounting block 32. The metal blocks 9 and the mounting block 32 can be firmly connected through the fixing structure on the mounting block 32, thereby realizing the assembly and fixing of the buffer component and the support body. The end of the movable block 25 away from the connecting block 13 is fixedly connected to the connecting rod 30. The purpose of the connecting rod 30 is to transmit pressure to the buffer component. The damping block 27 fixedly installed between each connecting rod 30 and the corresponding center block 31 can slow down the pressure transmission speed and consume impact energy. The two buffer springs 23 symmetrically fixedly installed between the connecting rod 30 and the inner wall of the fixed block 10 can quickly absorb instantaneous pressure. At the same time, the two support connecting rods 26 hinged between the connecting rod 30 and the center block 31 can disperse pressure by rotation. Finally, through the synergistic effect of the damping block 27, the buffer spring 23 and the support connecting rod 26, an efficient buffer structure is formed to weaken the pressure impact of the top plate.

[0034] Combination Figures 1-5As shown, in this embodiment, the fixing structure on the mounting block 32 includes a knob 11, a locking bolt 15, a rack 22, a gear 19, a bidirectional lead screw 16, a lead screw guide sleeve 18, a crossbar 21, and a limiting block 14; the locking bolt 15 is threaded vertically onto the top of the mounting block 32, and the knob 11 is correspondingly fixedly sleeved on the top of the locking bolt 15, forming a drive structure that is easy to operate; one end of the rack 22 is rotatably connected to the bottom end of the locking bolt 15, and the other end is slidably mounted inside the mounting block 32, which can achieve vertical displacement with the rotation of the locking bolt 15; the bidirectional lead screw 16 is rotatably mounted horizontally inside the mounting block 32, and two lead screw guide sleeves 18 are threaded onto the bidirectional lead screw 16, and a gear 19 that meshes with the rack 22 is fixedly sleeved in the middle of the bidirectional lead screw 16; the mounting block Both sides of the mounting block 32 are equipped with horizontally sliding crossbars 21. One end of each crossbar 21 is fixedly connected to two lead screw guide sleeves 18, and the other end is fixedly installed with a limiting block 14. The metal block 9 is provided with a limiting groove 12 that matches the limiting block 14. The metal block 9 and the mounting block 32 are stably fixed by the limiting block 14 engaging with the limiting groove 12. Each crossbar 21 is fitted with a return spring 17. One end of each return spring 17 is fixed to the corresponding crossbar 21, and the other end of each return spring 17 is fixed to the corresponding mounting block 32. Each mounting block 32 is fixedly installed with a slide rail 20. Each slide rail 20 is slidably installed with two sliders, and each slider is fixedly connected to the corresponding lead screw guide sleeve 18.

[0035] In this embodiment, the operation of the fixed structure on the mounting block 32 needs to be completed through the coordinated operation of various components: the locking bolt 15 is mounted on the top of the mounting block 32 along a vertical thread, and its function is to transmit power. The knob 11 fixedly sleeved at the top facilitates manual rotation by the operator, thereby driving the locking bolt 15 to rotate vertically within the mounting block 32; the rack 22, which is rotatably connected to the bottom end of the locking bolt 15 and slidably mounted inside the mounting block 32, will achieve vertical displacement with the rotation of the locking bolt 15, thereby converting the vertical movement into horizontal transmission power; the bidirectional lead screw 16, which is horizontally rotatably mounted inside the mounting block 32, has a gear 19 fixedly sleeved in the middle that meshes with the rack 22. When the rack 22 moves, it will drive the gear 19 and the bidirectional lead screw 16 to rotate synchronously, and the threaded sleeve on the bidirectional lead screw 16... The two lead screw guide sleeves 18 slide horizontally in opposite directions as the bidirectional lead screw 16 rotates. The horizontally sliding crossbars 21 mounted on both sides of the mounting block 32 are fixedly connected to the lead screw guide sleeves 18 at one end and fixedly mounted to the limiting block 14 at the other end. When the lead screw guide sleeves 18 slide, they will drive the crossbars 21 and the limiting block 14 to move synchronously. When the limiting block 14 is engaged in the matching limiting groove 12 on the metal block 9, the metal block 9 and the mounting block 32 can be firmly fixed. At the same time, the return spring 17 sleeved on the crossbar 21 is connected to the crossbar 21 at one end and to the mounting block 32 at the other end. It can assist the limiting block 14 to reset when unlocking. The slide rail 20 inside the mounting block 32 and the slider fixed to the lead screw guide sleeves 18 can limit the movement trajectory of the lead screw guide sleeves 18 and ensure that the limiting block 14 is accurately aligned with the limiting groove 12.

[0036] Combination Figures 1-5 As shown, in this embodiment, the rockfall protection component includes a rockfall interception net 5, and U-shaped blocks 29 are fixedly installed on the top of each of the four connecting blocks 13; each U-shaped block 29 has a tightening bolt 24 threaded on both sides, which is used to lock and fix the mounting plate 28; the tops of the four mounting plates 28 are fixedly connected to the rockfall interception net 5 to form a protection system covering the area below the support area, and multiple ventilation holes 4 are evenly opened on the rockfall interception net 5.

[0037] In this embodiment, the assembly and protective function of the rockfall protection component require sequential operation of each component: First, U-shaped blocks 29 are fixedly installed on the top of each of the four connecting blocks 13. The purpose of the U-shaped blocks 29 is to provide mounting support points for the mounting pieces 28, and to accommodate the ends of the mounting pieces 28 through their own groove structure, ensuring accurate positioning of the mounting pieces 28. Each U-shaped block 29 has threaded clamping bolts 24 on both sides. The purpose of the clamping bolts 24 is to lock and fix the mounting pieces 28. When in use, rotating the clamping bolts 24 clockwise gradually causes their ends to press against the sides of the mounting pieces 28, firmly fixing the mounting pieces 28 within the U-shaped blocks 29 to prevent... The mounting plate 28 has become loose and shifted; the tops of the four mounting plates 28 are fixedly connected to the rockfall interception net 5. The purpose of the mounting plates 28 is to connect the U-shaped block 29 to the rockfall interception net 5. Through the dispersed fixing of multiple mounting plates 28, the rockfall interception net 5 can be stably deployed to form a protective system covering the area below the support. It can effectively intercept rocks that may fall during the support process and ensure the safety of the workers below. Multiple ventilation holes 4 are evenly opened on the rockfall interception net 5. The purpose of the ventilation holes 4 is to ensure air circulation in the support area and avoid the rockfall interception net 5 completely blocking the ventilation. At the same time, it can also reduce the weight of the rockfall interception net 5 itself and reduce the load on the connecting structure.

[0038] This invention: The core working logic of the support device is to achieve stable support and safety protection for corner and top slabs through the coordinated operation of modular components. First, the support body adapts to corner areas of different sizes through two adjustable telescopic rods 1. Using the combination of the first metal plate 3, the second metal plate 7 and the positioning anchor bolts 6, it is fastened to the wall and the top of the wall respectively. Then, the telescopic part of the adjustable telescopic rod 1 is locked by the limiting bolts 2 to complete the precise positioning and fixation of the device. The buffer assembly, through the corresponding engagement of the metal block 9 and the mounting block 32, drives the locking bolt 15 via the knob 11, which in turn drives the rack 22, gear 19 and double-acting screw 16 to move together, so that the limiting block 14 is engaged in the limiting groove 12 for stable assembly. The internal buffer spring 23, damping block 27 and supporting connecting rod 26 form a multi-stage buffer structure, which can effectively absorb the pressure load during the roof support process and reduce the impact of surrounding rock deformation on the device. At the same time, the connecting telescopic rod 8 between the two fixed blocks 10 further enhances the integrity and stability of the buffer assembly, while the return spring 17, slide rail 20 and slider in the mounting block 32 ensure the flexibility of the fixed structure operation and the reliability of the reset.

[0039] The rockfall protection component uses the cooperation of U-shaped block 29, clamping bolt 24 and mounting plate 28 to fix the rockfall interception net 5 to the top of the connecting block 13, forming a protection system covering the area below the support. The ventilation holes 4 on the rockfall interception net 5 ensure the protection effect without affecting ventilation. In addition, the movable blocks 25 on both sides of the fixed block 10 in the buffer component can slide with pressure. Through the connecting rod 30, the buffer spring 23 is compressed, the damping block 27 is deformed and the support connecting rod 26 is rotated, further improving the buffering efficiency. The whole device comprehensively solves the problem of corner and top plate support through three-level protection of positioning and fixing, pressure buffering and rockfall interception, and improves the safety of operation.

[0040] The contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A roof support device for the corners of a coal mine longwall face based on an anchor bolt composite structure, characterized in that: It includes a support body, a fixing component, a buffer component, and a rockfall protection component; the support body and the fixing component work together to achieve stable positioning and installation of the device in the corner area of ​​the coal mine longwall face; the buffer component is assembled between the support bodies through a detachable connection to buffer the pressure load during the roof support process; the rockfall protection component is correspondingly assembled on the buffer component to intercept falling rocks in the support area and ensure operational safety.

2. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 1, characterized in that: The support body includes two adjustable telescopic rods (1), and the two ends of the two adjustable telescopic rods (1) are respectively rotatably mounted with a first metal plate (3) and a second metal plate (7) for fitting the wall top and the wall fixing surface; the adjustable telescopic rods (1) are equipped with limit bolts (2), and the telescopic part of the adjustable telescopic rods (1) can be locked by tightening the limit bolts (2), thereby flexibly adjusting the support span; two mounting blocks (32) are fixedly installed on the top of the two adjustable telescopic rods (1), and the mounting blocks (32) are integrated with a fixing structure for connecting the buffer assembly.

3. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 1, characterized in that: The fixing component includes positioning anchors (6). Four positioning anchors (6) are threadedly installed on the first metal plate (3) and the second metal plate (7). The two second metal plates (7) are fastened to the top of the wall through the corresponding positioning anchors (6), and the first metal plate (3) is firmly fixed to the wall through the corresponding positioning anchors (6), thereby achieving reliable positioning of the support body in the corner area.

4. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 1, characterized in that: The buffer assembly includes two fixed blocks (10), which are respectively set between two adjustable telescopic rods (1); each fixed block (10) has a movable block (25) slidably mounted on both sides, and a center block (31) is fixedly installed inside the fixed block (10); a connecting block (13) is fixedly connected to one end of the movable block (25), and two metal blocks (9) are fixedly installed on the connecting block (13), and the metal blocks (9) are set one-to-one with the mounting block (32); through the fixing structure on the mounting block (32), the metal blocks (9) on both sides can be stably connected to the mounting block (32), thereby realizing the assembly and fixing of the buffer assembly and the supporting body.

5. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 2, characterized in that: The fixing structure on the mounting block (32) includes a knob (11), a locking bolt (15), a rack (22), a gear (19), a double-acting screw (16), a screw guide sleeve (18), a crossbar (21), and a limiting block (14); the locking bolt (15) is mounted on the top of the mounting block (32) along a vertical thread, and the knob (11) is correspondingly fixedly sleeved on the top of the locking bolt (15), forming a driving structure that is easy to operate; one end of the rack (22) is rotatably connected to the bottom end of the locking bolt (15), and the other end is slidably mounted inside the mounting block (32), and can achieve vertical displacement with the rotation of the locking bolt (15); the double-acting screw (16) along the water... The mounting block (32) is rotated in the horizontal direction and is fitted with two screw guide sleeves (18) threaded on the double screw (16). A gear (19) that meshes with the rack (22) is fixedly fitted in the middle of the double screw (16). Both sides of the mounting block (32) are fitted with horizontal bars (21) in the horizontal direction. One end of the two horizontal bars (21) is fixedly connected to the two screw guide sleeves (18) respectively, and the other end is fixedly installed with a limit block (14). The metal block (9) is provided with a limit groove (12) that matches the limit block (14). The metal block (9) and the mounting block (32) are stably fixed by the limit block (14) being engaged with the limit groove (12).

6. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 4, characterized in that: The movable block (25) is fixedly connected to a connecting rod (30) at one end away from the connecting block (13); a damping block (27) is fixedly installed between each connecting rod (30) and the corresponding center block (31), and two buffer springs (23) are symmetrically fixedly installed between the connecting rod (30) and the inner wall of the fixed block (10); at the same time, two support rods (26) are also hinged between the connecting rod (30) and the corresponding center block (31). Through the synergistic effect of the damping block (27), the buffer springs (23) and the support rods (26), an efficient buffer structure is formed.

7. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 1, characterized in that: The rockfall protection component includes a rockfall interception net (5), and four connecting blocks (13) are fixedly installed with U-shaped blocks (29) on their tops; each U-shaped block (29) has a tightening bolt (24) threaded on both sides, and the tightening bolt (24) is used to lock the fixed mounting plate (28); the tops of the four mounting plates (28) are fixedly connected to the rockfall interception net (5) to form a protection system covering the area below the support area, and the rockfall interception net (5) is evenly provided with multiple ventilation holes (4).

8. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 4, characterized in that: Two connecting telescopic rods (8) are threaded between the two fixed blocks (10).

9. The corner roof support device for coal mine longwall faces based on an anchor bolt composite structure according to claim 5, characterized in that: A return spring (17) is sleeved on any crossbar (21). One end of any return spring (17) is fixed on the corresponding crossbar (21), and the other end of any return spring (17) is fixed on the corresponding mounting block (32). A slide rail (20) is fixedly installed inside any mounting block (32). Two sliders are slidably installed on any slide rail (20), and each slider is fixedly connected to the corresponding lead screw guide sleeve (18).

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