Extra-thick coal seam high fully mechanized caving mining coal mine tunnel roof support truss device

Abstract

The invention discloses a top plate support truss device for a high fully mechanized caving mining coal mine tunnel of an extra-thick coal seam, and belongs to the technical field of coal mine tunnel support. The truss device comprises a first supporting plate and a second supporting plate which are fixed to the bottom of a roadway top plate. A steel wire mesh is arranged between the first supporting plate and the second supporting plate; a moving seat is slidably mounted at the bottom of the first supporting plate; a driving plate is arranged at the bottom of the moving seat, first connecting plates are symmetrically and rotationally connected to the two sides of the driving plate, second connecting plates are rotationally connected to the first connecting plates, L-shaped top plates are rotationally mounted on the second connecting plates, and the driving part drives the first connecting plates and the second connecting plates to move, so that the driving plate, the first connecting plates and the second connecting plates form an M-like shape from a U shape; according to the invention, the problem that the existing fixed steel wire mesh is inconvenient to discharge dropped coal briquette slag is solved, and the influence of accumulation of the coal briquette slag on the bearing load of the steel wire mesh is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine roadway support, and in particular relates to a roof support truss device for a coal mine roadway with high fully mechanized caving mining in an extremely thick coal seam. Background Art

[0002] During the fully-mechanized high-pressure top-coal caving (LCC) mining process in extra-thick coal seams, supporting the mine roadway roof is a critical step in ensuring safe and efficient mining operations. This technique, developed for mines with thick seams and complex geological conditions, uses a comprehensive mechanized top-coal caving process to gradually remove the top coal from the seam, achieving efficient mining. During this process, the mine roadway roof is subjected to tremendous pressure and complex stress changes, making it highly susceptible to safety accidents such as roof collapse and roof falls. Therefore, reliable support devices are essential to ensure the stability of the roadway roof.

[0003] At present, the existing roof support truss device for coal mine tunnels with high comprehensive mining in extra-thick coal seams usually adopts the method of fixing the wire mesh directly on the roof for support. This fixed design can, to a certain extent, play a role in supporting the roof and preventing the roof rock from falling. However, in the actual mining process, due to factors such as the frequent movement of large mechanical equipment inside the tunnel and the disturbance of the roof by mining operations, some rocks will fall off from the top of the coal mine. The fallen coal block fragments will accumulate on the wire mesh, and the existing fixed wire mesh design is not convenient for the discharge of these fallen coal block fragments. As the coal block fragments continue to accumulate, it will not only increase the load-bearing burden of the wire mesh and affect its support effect, but may also cause other safety hazards, such as obstructing the passage of personnel and equipment, affecting the ventilation effect, etc., which will have an adverse impact on the safety and efficiency of coal mining operations. Summary of the Invention

[0004] The present invention overcomes the shortcomings of the prior art and proposes a roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining. The present invention is achieved through the following technical solutions: A truss device for supporting the roof of a roadway in a fully mechanized coal mine with a particularly thick coal seam and high-pressure caving mining comprises a first support plate fixed in the middle of the bottom of the roadway roof and second support plates fixed on both sides of the bottom of the roadway roof; legs are connected to both sides of the first support plate and the second support plates; a wire mesh is provided between the first support plate and the second support plates on both sides; a movable seat is slidably mounted between the top ends of the two support legs at the bottom of the first support plate; one end of the wire mesh is connected to the movable seat by a tension spring, and the other end of the wire mesh is hinged to the second support plates; A driving plate is provided at the bottom of the moving seat, and the top of the driving plate is symmetrically fixedly connected to a pull rod, which is slidably connected to the moving seat; the driving plate is symmetrically rotatably connected to the first connecting plate on both sides, and the two first connecting plates are rotatably connected to the second connecting plate at one end away from the driving plate, and the two second connecting plates are rotatably installed with an L-shaped top plate at one end away from each other, and a driving member for driving the driving plate to move is provided between the two legs at the bottom of the first support plate, and a torsion spring is installed at the connection between the driving plate and the first connecting plate and the connection between the first connecting plate and the second connecting plate, and the force direction of the torsion spring is opposite; the driving member drives the first connecting plate and the second connecting plate to move, so that the driving plate, the first connecting plate and the second connecting plate are formed from a � shape to an M shape.

[0005] Furthermore, the driving member includes a driving threaded rod and a bidirectional threaded rod. The driving threaded rod is rotatably installed inside the two legs connected to the first support plate. A motor is installed inside the two legs connected to the first support plate. The output end of the motor is fixedly connected to the corresponding driving threaded rod, and the two ends of the driving plate are respectively threadedly connected to the corresponding driving threaded rod. A threaded slider is rotatably installed on one side of the two second connecting plates, and a bidirectional threaded rod is rotatably installed on one end of the driving plate, and the two ends of the bidirectional threaded rod are respectively threadedly connected to the corresponding threaded slider.

[0006] Furthermore, a large sprocket is fixedly connected to one side of the threaded slider, a small sprocket is fixedly connected to the connection between the L-shaped top plate and the second connecting plate, the large sprocket and the small sprocket are connected by a chain transmission, a gear is fixedly connected to the middle part of the bidirectional threaded rod, and one side of the two legs connected to the first support plate are fixedly connected to a rack, and the gear is intermittently meshed with the corresponding rack.

[0007] Furthermore, the gear ratio of the large sprocket to the small sprocket is 3:1.

[0008] Furthermore, downward pressing pieces are respectively installed at both ends of the movable seat, and downward pressing seats are symmetrically slidably installed on both sides of the movable seat. A rubbing board is slidably installed on the bottom end of the downward pressing seat along the length direction, and the bottom end of the rubbing board is in contact with and connected to the top end of the wire mesh; the downward pressing piece acts on the downward pressing seat, so that the downward pressing seat drives the rubbing board to press on the wire mesh, which is convenient for cleaning the coal blocks and slag embedded in the wire mesh.

[0009] Furthermore, spherical blocks are fixedly connected to the bottom end of the washboard at equal intervals, and the spherical blocks are embedded in the holes of the wire mesh.

[0010] Furthermore, the lower pressure part includes a conical friction wheel, an ascending friction strip and a descending friction groove; conical friction wheels are symmetrically and slidably installed on the inner sides of both ends of the moving seat, and the ascending friction strips are symmetrically fixedly connected to the tops of both ends of the first support plate, and a descending friction groove is provided on one side of the corresponding support leg, and one side of the conical friction wheel is frictionally connected to the descending friction groove. A long slide groove and a short slide groove are respectively provided on both sides of the support leg connected by the first support plate, one end of the short slide groove is connected to the bottom of the long slide groove, and the other end of the short slide groove is connected to the middle of the long slide groove, and a triangular guide block is fixedly connected to the connection between the short slide groove and the long slide groove; one side of the conical friction wheel is rotatably connected to a switching block, the switching block is slidably connected to the inner wall of the long slide groove, and a reset spring is fixedly connected to the inside of the switching block, and one end of the switching block is slidably connected to a spring block, which is fixedly connected to the reset spring, and the conical friction wheel is fixedly connected to a shift rod, which is slidably connected to the lower pressure seat.

[0011] Furthermore, the inclined surface of the triangular guide block at the connection between one end of the short chute and the bottom of the long chute faces the long chute, and the inclined surface of the triangular guide block at the connection between the other end of the short chute and the middle of the long chute faces the short chute.

[0012] Furthermore, a connecting block is fixedly connected to the bottom end of the lower pressure seat, a groove body is provided on the washboard, the connecting block is located in the groove body, and a first spring is connected between the side wall of the groove body and the connecting block, so that the connecting block and the washboard are slidably connected; one end of the two washboards is fixedly connected to a connecting rod, and one side of the corresponding support leg is fixedly connected to a protruding block, the outer wall of the connecting rod is in contact with the outer wall of the protruding block, and the heights of the several protrusions on the protruding block are all different.

[0013] Furthermore, a planar thread groove is opened inside the movable seat, and several tension springs are fixedly installed inside the planar thread groove. One end of the wire mesh is fixedly connected to several groups of flexible steel wire ropes; the several groups of flexible steel wire ropes correspond to the several groups of tension springs one by one and are fixedly connected.

[0014] The beneficial effects of the present invention compared to the prior art are: 1. The present invention facilitates the cleaning of fallen coal debris: when it is necessary to clean the fallen coal debris on the wire mesh, the motor is started to drive the driving threaded rod to rotate, causing the driving plate to descend, and then driving the first connecting plate and the second connecting plate to move, transforming the original U-shaped structure into an M-shaped structure. At the same time, the L-shaped top plate is retracted, one end of the wire mesh is tilted, and the length changes, and the flexible wire rope is stretched to adapt to the operation. During this process, the coal debris on the wire mesh can slide along the tilted wire mesh, effectively solving the problem of the existing fixed wire mesh being difficult to discharge the fallen coal debris, avoiding the impact of the accumulation of coal debris on the load-bearing capacity of the wire mesh, ensuring the support effect, and also eliminating the potential safety hazards caused by the accumulation of coal debris, such as obstruction of personnel and equipment passage, and affecting ventilation effect, thereby ensuring the safety and efficiency of coal mining operations.

[0015] 2. Preventing coal debris from entering the device: As the moving base descends, the conical friction wheel engages the descending friction groove and begins to rotate, driving the lever to lower the lower pressure base along both sides of the moving base. This descent of the lower pressure base closes the gap between the wire mesh and the moving base, preventing coal debris from entering the device. This prevents device malfunctions or poor operation caused by the entry of coal debris, extending the device's service life and reducing maintenance costs. It also provides support for the subsequent washboard, ensuring the stability of the device's overall structure and the integrity of its functions.

[0016] 3. Providing irregular shaking force to promote the discharge of coal lumps and debris: A raised block with different heights is designed on one side of the support leg. When the moving seat descends, the connecting rod on the washboard runs along the outer surface of the raised block. Because a first spring is designed between the washboard and the connecting block, and the lower pressure seat can only move up and down, and the washboard can only move along the length of the lower pressure seat, the connecting rod moves the washboard along the raised direction of the raised block, and then resets through the first spring, causing the spherical block on the washboard to continuously rub against the wire mesh, causing shaking. This irregular shaking force can further promote the discharge of coal lumps and debris remaining on the wire mesh, improve the cleaning effect, ensure that the wire mesh always maintains good working condition, and provide reliable support for the coal mine roadway roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the position structure of the first support plate and the movable seat of the present invention; Figure 3 This is a partial cross-sectional structural diagram of the movable seat of the present invention; Figure 4 This is a schematic diagram of the structure of the driving member of the present invention; Figure 5 It is a structural schematic diagram of the mobile seat of the present invention; Figure 6 Schematic diagram of the position structure of the rack of the present invention; Figure 7 This is a schematic diagram of the position structure of the rising friction strip of the present invention; Figure 8 This is a schematic diagram of the long chute position structure of the present invention; Figure 9 An exploded view of the driving plate, the first connecting plate and the second connecting plate of the present invention; Figure 10 It is a structural schematic diagram of a partial cross-section of the lower press seat and the washboard of the present invention; Figure 11 It is a partial structural schematic diagram of the long chute and the short chute of the present invention; Figure 12 Schematic diagram of the structure of the protruding block of the present invention; Figure 13 This is a schematic diagram of the structure of the switching block of the present invention; Figure 14 for Figure 13 Enlarged view of point A in the middle; Figure 15 for Figure 3 Enlarged view of point B in the middle; Figure 16 for Figure 8 Enlarged view of point C in the middle.

[0018] In the figure: 1. support leg; 2. first support plate; 3. wire mesh; 4. movable seat; 5. flat thread groove; 6. tension spring; 7. flexible wire rope; 8. driving plate; 9. first connecting plate; 10. second connecting plate; 11. L-shaped top plate; 12. lower pressure seat; 13. rubbing board; 14. pull rod; 15. second support plate; 21. driving threaded rod; 22. threaded slider; 23. bidirectional threaded rod; 24. large sprocket; 25. small sprocket; 26. gear; 27. rack; 31. conical friction wheel; 32. rising friction strip; 33. descending friction groove; 34. long slide; 35. short slide; 36. triangular guide block; 37. switching block; 38. reset spring; 39. spring block; 310. dial rod; 51. connecting block; 52. first spring; 53. connecting stick; 54. protruding block. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0020] See also Figures 1 to 16 The present embodiment proposes a roof support truss device for a coal mine roadway with high fully mechanized caving mining in an extra-thick coal seam, comprising a first support plate 2 located in the middle of the bottom of the roadway roof and second support plates 15 located on both sides of the bottom of the roadway roof; the first support plate 2 and the second support plate 15 are both rectangular structures, and the bottom sides of the first support plate 2 and the second support plate 15 are connected to support legs 1; the first support plate 2 and the second support plate 15 are fixed to the coal mine roadway roof through anchor rods; a wire mesh 3 is installed between the tops of the two support legs 1 at the bottom of the first support plate 2; a moving seat 4 is slidably installed between the tops of the two support legs 1 at the bottom of the first support plate 2; a flat thread groove 5 is opened inside the moving seat 4, and a plurality of tension springs 6 are fixedly installed inside the flat thread groove 5, and one end of the wire mesh 3 is fixedly connected to a plurality of groups of flexible steel wire ropes 7; the plurality of groups of flexible steel wire ropes 7 correspond to and are fixedly connected to the plurality of groups of tension springs 6 one by one; the other end of the wire mesh 3 is hinged to the second support plate 15.

[0021] A driving plate 8 is provided at the bottom of the moving seat 4. Symmetrically fixed to the top end of the driving plate 8 are pull rods 14, and the pull rods 14 are slidably connected to the moving seat 4. Symmetrically rotatably connected to both sides of the driving plate 8 are first connecting plates 9. One end of each of the two first connecting plates 9 away from the driving plate 8 is respectively rotatably connected to a second connecting plate 10. L-shaped top plates 11 are rotatably installed at one end of each of the two second connecting plates 10 away from each other. Between the two legs 1 at the bottom of the first support plate 2, there is a driving member for driving the movement of the driving plate 8. Torsion springs are installed at the connection between the driving plate 8 and the first connecting plate 9 and at the connection between the first connecting plate 9 and the second connecting plate 10, and the acting directions of the torsion springs are opposite. When the driving member drives the first connecting plate 9 and the second connecting plate 10 to move, it will cause the driving plate 8, the first connecting plate 9, and the second connecting plate 10 to change from the original U-shaped to a shape similar to M-shaped. The initial state of the coal mine roadway roof truss device is as follows: The first support plate 2 and the second support plate 15 are both closely attached to the inside of the coal mine roadway and are fixed to the roadway roof by bolts. The legs 1 provide support for the first support plate 2 and the second support plate 15. One end of the wire mesh 3 is hinged to the second support plate 15, and the other end is installed on the moving seat 4 of the first support plate 2. Due to a certain height difference between the first support plate 2 and the moving seat 4, the top of the L-shaped top plate 11 abuts against the edge of the wire mesh 3 close to it installed on the moving seat 4, preventing the wire mesh 3 from not closely adhering to the roadway roof.

[0022] Please refer to Figure 2 、 4 、6 and Figure 9As shown, the driving member includes a driving threaded rod 21 and a bidirectional threaded rod 23. The two legs 1 connected to the first support plate 2 are both rotatably installed with the driving threaded rod 21. The two legs 1 connected to the first support plate 2 are both installed with a motor. The output end of the motor is fixedly connected to the corresponding driving threaded rod 21. The two ends of the driving plate 8 are respectively threadedly connected to the corresponding driving threaded rod 21. One side of the two second connecting plates 10 is rotatably installed with a threaded slider 22. One end of the driving plate 8 is rotatably installed with a bidirectional threaded rod 23. The two ends of the bidirectional threaded rod 23 are respectively connected to the corresponding threaded slider 22. Threaded connection, one side of the threaded slider 22 is fixedly connected to a large sprocket 24, and a small sprocket 25 is fixedly connected to the connection between the L-shaped top plate 11 and the second connecting plate 10. The large sprocket 24 and the small sprocket 25 are connected by a chain transmission. The middle part of the two-way threaded rod 23 is fixedly connected to a gear 26. One side of the two legs 1 connected to the first support plate 2 is fixedly connected to a rack 27. The gear 26 is intermittently meshed with the corresponding rack 27. The gear ratio of the large sprocket 24 to the small sprocket 25 is 3:1; when it is necessary to clean the coal mine debris on the wire mesh 3, first start the two motors, and then drive the two The driving plate 8 is connected to the driving thread 21 at both ends by a driving thread rod 21, so the driving plate 8 is lowered. Since the driving plate 8 is designed with a pull rod 14, and there is a movement redundancy between the pull rod 14 and the moving seat 4, the driving plate 8 is lowered at first, and the driving plate 8 drives the first connecting plate 9 and the second connecting plate 10 to lower, so that the original L-shaped top plate 11 gradually does not contact the wire mesh 3. As the driving plate 8 is lowered, the pull rod 14 drives the moving seat 4 to lower. At this time, the wire mesh 3 gradually begins to tilt. When the driving plate 8 is lowered to a certain position, the gear 26 is meshed with the rack 27, and the bidirectional screw As the threaded rod 23 rotates along with the movement of the driving plate 8, the two threaded sliders 22 on the two second connecting plates 10 approach each other. Since there are torsion springs between the driving plate 8 and the two first connecting plates 9, and between the first connecting plates 9 and the second connecting plates 10, and their elastic forces are in opposite directions, the approach of the threaded sliders 22 causes the first connecting plates 9 to rotate upward along the hinge of the driving plate 8, while the second connecting plates 10 to rotate downward along the hinge of the first connecting plates 9. This changes the driving plate 8, the first connecting plates 9, and the second connecting plates 10 from their original U-shape to an M-shape. This design is to prevent coal debris from falling onto the L-shaped top plate 11 and the driving plate 8 when the wire mesh 3 tilts, thereby affecting subsequent operation. As the threaded sliders 22 approach each other, the second connecting plate 10 is folded. At this time, the threaded slider 22 and the second connecting plate 10 rotate relative to each other by 60 degrees. At this time, the large sprocket 24 also rotates, and finally the small sprocket 25 rotates. The gear ratio of the large sprocket 24 and the small sprocket 25 is 3:1, so the large sprocket 24 rotates 60 degrees and the small sprocket 25 rotates 180 degrees, and the L-shaped top plate 11 is folded.

[0023] A pressing member is mounted on each end of the movable base 4. A pressing member 12 is symmetrically and slidably mounted on both sides of the movable base 4. A washboard 13 is slidably mounted on the bottom end of the pressing member 12 along its length. The bottom end of the washboard 13 is in contact with the top end of the wire mesh 3. Spherical blocks are fixedly connected to the bottom end of the washboard 13 at equal intervals, and the spherical blocks are embedded in the holes of the wire mesh 3. The pressing member acts on the pressing member 12, causing the pressing member 12 to drive the washboard 13 to press against the wire mesh 3, making it easier to clean coal lumps and debris embedded in the wire mesh 3.

[0024] See also Figure 7 、 8 , 11, 12, 13 and Figure 14 As shown, the pressing part includes a conical friction wheel 31, an ascending friction strip 32 and a descending friction groove 33; conical friction wheels 31 are symmetrically slidably installed on the inner sides of both ends of the movable seat 4, and ascending friction strips 32 are symmetrically fixedly connected to the tops of both ends of the first support plate 2. A descending friction groove 33 is opened on one side of the corresponding support leg 1, and one side of the conical friction wheel 31 is frictionally connected to the descending friction groove 33. A long slide groove 34 and a short slide groove 35 are respectively opened on both sides of the support leg 1 connected to the first support plate 2. One end of the short slide groove 35 is connected to the bottom of the long slide groove 34. The other end of the short slide 35 is connected to the middle of the long slide 34, and the short slide 35 and the long slide 34 are fixedly connected to a triangular guide block 36 at the connection point. A switching block 37 is rotatably connected to one side of the conical friction wheel 31. The switching block 37 is slidably connected to the inner wall of the long slide 34. A return spring 38 is fixedly connected to the inside of the switching block 37. A spring block 39 is slidably connected to one end of the switching block 37. The spring block 39 is fixedly connected to the return spring 38. A detent rod 310 is fixedly connected to the middle of the conical friction wheel 31. The detent rod 310 is connected to the lower pressure seat 12 sliding connection; since one side of the support leg 1 is designed with an ascending friction strip 32 and a descending friction groove 33, the descent of the movable seat 4 will cause the conical friction wheel 31 to rub against the descending friction groove 33, causing the conical friction wheel 31 to start rotating, and the rotation of the conical friction wheel 31 will drive one end of the lever 310 to rotate along the center of the conical friction wheel 31, thereby causing the lower pressing seat 12 to descend along both sides of the movable seat 4. The descent of the lower pressing seat 12 has two purposes. The first purpose is to plug the gap at the connection between the wire mesh 3 and the movable seat 4. Prevent coal blocks and debris from entering; purpose two, to provide support for the washboard 13 at the back. Since coal blocks and debris may be embedded in the holes in the wire mesh 3, it is necessary to continuously shake one end of the wire mesh 3 so that the wire mesh 3 continuously changes its inclination angle. Therefore, the threaded rod 21 is driven to drive the moving seat 4 to descend, so that the conical friction wheel 31 at one end contacts with the descending friction groove 33 when descending, and contacts with the ascending friction bar 32 when ascending, so that it always forms a counterclockwise rotation, so that the washboard 13 always contacts one end of the wire mesh 3.

[0025] When the sliding block 37 is in the long groove 34, the conical friction wheel 31 contacts the descending friction groove 33, and the specific movement is as follows: the initial position of the switching block 37 is at the top of the long groove 34. At this time, as the moving seat 4 descends, the spring block 39 on the switching block 37 begins to slide in the long groove 34. Since the two ends of the short groove 35 are connected to the long groove, the inclined surface of the triangular guide block 36 at the connection between one end of the short groove 35 and the bottom of the long groove 34 faces the long groove 34, and the other end of the short groove 35 is connected to the long groove The inclined surface of the triangular guide block 36 at the middle connection of the groove 34 faces the short slide 35; so when the spring block 39 moves to the connection between the end of the short slide 35 and the bottom of the long slide 34, the spring block 39 passes through the inclined surface of the triangular guide block 36 and begins to compress the return spring 38, and comes into the inside of the short slide 35. At this time, the moving seat 4 rises, the conical friction wheel 31 is displaced and contacts the rising friction bar 32. When the spring block 39 moves to the connection between the other end of the short slide 35 and the middle of the long slide 34, the spring block 39 passes through the inclined surface of the triangular guide block 36 and begins to compress the return spring 38, and comes into the inside of the long slide 34. At this time, the moving seat 4 descends, the conical friction wheel 31 is displaced and contacts the descending friction groove 33.

[0026] See also Figure 10 and Figure 12 As shown, the bottom end of the lower pressing seat 12 is fixedly connected to a connecting block 51, and a groove body is provided on the washing board 13. The connecting block 51 is located in the groove body, and a first spring 52 is connected between the side wall of the groove body and the connecting block 51, so that the connecting block 51 is slidably connected to the washing board 13; one end of the two washing boards 13 is fixedly connected to a connecting rod 53, and one side of the corresponding supporting leg 1 is fixedly connected to a protruding block 54, and the outer wall of the connecting rod 53 contacts the outer wall of the protruding block 54, and the heights of the several protrusions on the protruding block 54 are all different; in order to provide irregular shaking force to the wire mesh 3, the support leg 1 is fixedly connected to the supporting leg 1. A raised block 54 is provided on one side, and the raised heights of the raised block 54 are all different. When the movable seat 4 descends, the connecting rod 53 on the washboard 13 runs along the outer surface of the raised block 54. A first spring 52 is connected between the washboard 13 and the connecting block 51. Since the lower pressing seat 12 moves downward at this time, the washboard 13 can only move along the length direction of the lower pressing seat 12, so the connecting rod 53 moves with the washboard 13 along the raised direction of the raised block 54, and then resets through the first spring 52, so that the spherical block on the washboard 13 continuously rubs the wire mesh 3 to cause shaking.

[0027] Working principle of a roof support truss device for coal mine roadway with high fully mechanized caving mining in extra-thick coal seams: The initial state of the roof truss device in the coal mine roadway is as follows: The first support plate 2 and the second support plate 15 are close to the roof of the coal mine roadway and are fixed to the roadway roof by anchor bolts. The support leg 1 provides support force to the first support plate 2 and the second support plate 15. A wire mesh 3 is arranged between the first support plate 2 and the second support plate 15. One end of the wire mesh 3 is hinged to the second support plate 15, and the other end is installed on the moving seat 4 of the first support plate 2. The top of the L-shaped roof plate 11 abuts against the edge of the wire mesh 3 near the moving seat 4 to prevent the wire mesh 3 from not being close to the roadway roof.

[0028] When it is necessary to clean the coal lumps and debris falling off the wire mesh 3, first start the two motors. The motors drive the two driving threaded rods 21. Since both ends of the driving plate 8 are threadedly connected to the driving thread 21, the driving plate 8 descends. Since there is a pull rod 14 on the driving plate 8 and there is a movement redundancy between the pull rod 14 and the moving seat 4, at first, the driving plate 8 descends, and the driving plate 带动板8带动第一连接板9和第二连接板10下降,使得原本L型顶板11逐步不接触钢丝网3,随着带动板8的下降,拉杆14带动移动座4下降,此时钢丝网3逐渐开始倾斜,当带动板8下降至一定位置后齿轮26与齿条27发生啮合,双向螺纹杆23随着带动板8的移动进行自转,此时两个第二连接板10上的两个螺纹滑块22相互靠近,由于带动板8和两个第一连接板9之间存在扭力弹簧,第一连接板9与第二连接板10之间也存在扭力弹簧,并且他们的弹力方向相反,此时两个螺纹滑块22的靠近使得第一连接板9沿着带动板8的铰接处向上旋转,而第二连接板10沿着第一连接板9的铰接处向下旋转,此时将带动板8、第一连接板9和第二连接板10从原本的凵型形成类M型,这样设计,是为了避免钢丝网3倾斜时煤块碎渣落在L型顶板11和带动板8上,使其影响后期的运行,由于螺纹滑块22的相互靠近第二连接板10发生折叠,此时螺纹滑块22与第二连接板10相对旋转60度,此时大链轮24也旋转,最终使得小链轮25旋转,大链轮24与小链轮25齿轮比为3:1,所以大链轮24旋转60度,小链轮25旋转180度,将L型顶板11收起。

[0029] Meanwhile, since one end of the wire mesh 3 needs to be tilted, its length needs to change. At this time, the wire mesh 3 pulls the flexible steel wire rope 7, stretching the tension spring 开拉伸拉簧[6],进而改变钢丝网3的长度,适应后续的运行。

[0030] It should be noted that there seems to be some inaccuracies or unclear expressions in the original text in part , such as "带动板8带动第一连接板9和第二连接板10下降,使得原本L型顶板11逐步不接触钢丝网3" which is a bit jumbled in description. The translation is based on the best understanding of the overall context.Since one side of the support leg 1 at the bottom of the first support plate 2 is designed with an ascending friction strip 32 and a descending friction groove 33, the descending of the moving seat 4 will cause the conical friction wheel 31 to rub against the descending friction groove 33, which will cause the conical friction wheel 31 to rotate. The rotation of the conical friction wheel 31 will drive one end of the shift rod 310 to rotate along the center of the conical friction wheel 31, thereby causing the lower pressing seat 12 to descend along both sides of the moving seat 4. The descent of the lower pressing seat 12 has two purposes: one is to block the gap at the connection between the wire mesh 3 and the moving seat 4 to prevent coal blocks and slag from entering; the other is to provide support for the washboard 13 at the back, because coal blocks and slag may be embedded in The holes in the wire mesh 3 need to be continuously shaken at one end of the wire mesh 3 so that the wire mesh 3 changes its tilt angle continuously. Therefore, the threaded rod 21 is driven to drive the movable seat 4 to descend, so that the conical friction wheel 31 at one end thereof contacts the descending friction groove 33 when descending, and contacts the ascending friction bar 32 when ascending, so that it always rotates counterclockwise, thereby making the washboard 13 always contact one end of the wire mesh 3; and the conical friction wheel 31 can switch between the ascending friction bar 32 and the descending friction groove 33: that is, a long slide groove 34 and a short slide groove 35 are provided on one side of the support leg 1 at the bottom of the first support plate 2. When the switching block 37 is turned, the conical friction wheel 31 can be turned back to the left and right sides of the movable seat 4. When it is inside the long chute 34, the conical friction wheel 31 contacts the descending friction groove 33. The specific movement is as follows: the initial position of the switching block 37 is at the top of the long chute 34. At this time, as the moving seat 4 descends, the spring block 39 on the switching block 37 begins to slide in the long chute 34. Since triangular guide blocks 36 are provided at the connection points between the two ends of the short chute 35 and the long chute 34, the inclined surface of the triangular guide block 36 at the connection between one end of the short chute 35 and the bottom of the long chute 34 faces the long chute 34, and the inclined surface of the triangular guide block 36 at the connection between the other end of the short chute 35 and the middle of the long chute 34 faces the short chute 35, so when the spring block 37 is at the top of the long chute 34, the sliding block 39 on the switching block 37 begins to slide in the long chute 34. When the spring block 39 moves to the connection between the end of the short chute 35 and the bottom of the long chute 34, the spring block 39 passes through the inclined surface of the triangular guide block 36 here, begins to compress the return spring 38, and comes into the inside of the short chute 35. At this time, when the movable seat 4 rises, the conical friction wheel 31 is displaced and contacts the rising friction bar 32. When the spring block 39 moves to the connection between the other end of the short chute 35 and the middle of the long chute 34, the spring block 39 passes through the inclined surface of the triangular guide block 36 here, begins to compress the return spring 38, and comes into the inside of the long chute 34. At this time, the movable seat 4 descends, and the conical friction wheel 31 is displaced and contacts the descending friction groove 33.

[0031] At this time, in order to provide irregular shaking force to the wire mesh 3, a protrusion 54 is designed on one side of the support leg 1 at the bottom of the first support plate 2, and the height of the protrusion is different. When the movable seat 4 descends, the connecting rod 53 on the washboard 13 runs along the outer surface of the protrusion 54. A first spring 52 is connected between the washboard 13 and the connecting block 51. Since the lower pressure seat 12 moves downward and the washboard 13 can only move along the length direction of the lower pressure seat 12, the connecting rod 53 moves with the washboard 13 along the protruding direction of the protrusion 54, and then resets through the first spring 52, so that the spherical block on the washboard 13 continuously rubs the wire mesh 3 to cause shaking, and the coal blocks and slag stuck in the pores of the wire mesh 3 are shaken off.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be considered that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims

1. A roof support truss device for a coal mine roadway with high fully mechanized caving mining in an extra-thick coal seam, characterized in that: It includes a first support plate (2) fixed in the middle of the bottom of the roadway roof and second support plates (15) fixed on both sides of the bottom of the roadway roof; legs (1) are connected to both sides of the first support plate (2) and the second support plates (15); a wire mesh (3) is arranged between the first support plate (2) and the second support plates (15) on both sides; a moving seat (4) is slidably installed between the tops of the two legs (1) at the bottom of the first support plate (2); one end of the wire mesh (3) is connected to the moving seat (4) through a tension spring (6), and the other end of the wire mesh (3) is hinged to the second support plate (15). A driving plate (8) is arranged at the bottom of the moving seat (4), and pull rods (14) are symmetrically and fixedly connected to the top of the driving plate (8). The pull rods (14) are slidably connected to the moving seat (4); first connecting plates (9) are symmetrically and rotatably connected to both sides of the driving plate (8). One ends of the two first connecting plates (9) far away from the driving plate (8) are respectively rotatably connected to second connecting plates (10). L-shaped roof plates (11) are rotatably installed at the ends of the two second connecting plates (10) far away from each other. A driving member for driving the driving plate (8) to move is arranged between the two legs (1) at the bottom of the first support plate (2). Torsion springs are installed at the joints of the driving plate (8) and the first connecting plates (9) and at the joints of the first connecting plates (9) and the second connecting plates (10), and the acting directions of the torsion springs are opposite; the driving member drives the first connecting plates (9) and the second connecting plates (10) to move, so that the driving plate (8), the first connecting plates (9) and the second connecting plates (10) form a shape similar to an M shape from a U shape.

2. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 1 is characterized in that: The driving member includes a driving threaded rod (21) and a bidirectional threaded rod (23). The driving threaded rods (21) are rotatably installed inside the two legs (1) connected to the first support plate (2). Motors are installed inside the two legs (1) connected to the first support plate (2). The output ends of the motors are fixedly connected to the corresponding driving threaded rods (21). The two ends of the driving plate (8) are respectively threadedly connected to the corresponding driving threaded rods (21). Threaded sliders (22) are rotatably installed on one side of the two second connecting plates (10). A bidirectional threaded rod (23) is rotatably installed at one end of the driving plate (8). The two ends of the bidirectional threaded rod (23) are respectively threadedly connected to the corresponding threaded sliders (22).

3. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 2 is characterized in that: A large sprocket (24) is fixedly connected to one side of the threaded slider (22). A small sprocket (25) is fixedly connected to the joint of the L-shaped roof plate (11) and the second connecting plate (10). The large sprocket (24) and the small sprocket (25) are connected by chain drive. A gear (26) is fixedly connected to the middle of the bidirectional threaded rod (23). A rack (27) is fixedly connected to one side of the two legs (1) connected to the first support plate (2). The gear (26) is intermittently meshed with the corresponding rack (27).

4. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 3 is characterized in that: The gear ratio of the large sprocket (24) to the small sprocket (25) is 3:

1.

5. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 1 is characterized in that: The two ends of the movable seat (4) are respectively provided with a pressing member, and the two sides of the movable seat (4) are symmetrically slidably provided with a pressing seat (12), and the bottom end of the pressing seat (12) is slidably provided with a rubbing plate (13) along the length direction, and the bottom end of the rubbing plate (13) is in contact with and connected to the top end of the wire mesh (3); the pressing member acts on the pressing seat (12), so that the pressing seat (12) drives the rubbing plate (13) to press on the wire mesh (3), thereby facilitating the cleaning of coal blocks and slag embedded in the wire mesh (3).

6. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 5 is characterized in that: The bottom end of the washboard (13) is fixedly connected with spherical blocks at equal distances, and the spherical blocks are embedded in the holes of the wire mesh (3).

7. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 5 is characterized in that: The pressing member includes a conical friction wheel (31), an ascending friction strip (32) and a descending friction groove (33); the conical friction wheel (31) is symmetrically slidably installed on the inner sides of both ends of the movable seat (4); the ascending friction strip (32) is symmetrically fixedly connected to the top of both ends of the first support plate (2); a descending friction groove (33) is provided on one side of the corresponding support leg (1); one side of the conical friction wheel (31) is frictionally connected to the descending friction groove (33); a long slide groove (34) and a short slide groove (35) are respectively provided on both sides of the support leg (1) connected to the first support plate (2); one end of the short slide groove (35) is connected to the bottom of the long slide groove (34); and the short slide groove (35) is connected to the bottom of the long slide groove (34). 5) is connected to the middle of the long chute (34), and the short chute (35) and the long chute (34) are both fixedly connected to a triangular guide block (36); one side of the conical friction wheel (31) is rotatably connected to a switching block (37), the switching block (37) is slidably connected to the inner wall of the long chute (34), the switching block (37) is fixedly connected to the reset spring (38), one end of the switching block (37) is slidably connected to a spring block (39), the spring block (39) is fixedly connected to the reset spring (38), the conical friction wheel (31) is fixedly connected to a shift rod (310), and the shift rod (310) is slidably connected to the lower pressure seat (12).

8. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 7 is characterized in that: The inclined surface of the triangular guide block (36) at the connection between one end of the short chute (35) and the bottom of the long chute (34) faces the long chute (34), and the inclined surface of the triangular guide block (36) at the connection between the other end of the short chute (35) and the middle of the long chute (34) faces the short chute (35).

9. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 7 is characterized in that: The bottom end of the lower pressing seat (12) is fixedly connected with a connecting block (51), a groove body is provided on the washing board (13), the connecting block (51) is located in the groove body, and a first spring (52) is connected between the side wall of the groove body and the connecting block (51), so that the connecting block (51) and the washing board (13) are slidably connected; one end of the two washing boards (13) is fixedly connected with a connecting rod (53), and one side of the corresponding support leg (1) is fixedly connected with a protruding block (54), the outer wall of the connecting rod (53) is in contact with the outer wall of the protruding block (54), and the heights of the several protrusions on the protruding block (54) are all different.

10. The roof support truss device for a coal mine roadway in a particularly thick coal seam with high fully mechanized caving mining according to claim 1 is characterized in that: A planar thread groove (5) is provided inside the movable seat (4), and a plurality of tension springs (6) are fixedly installed inside the planar thread groove (5). One end of the wire mesh (3) is fixedly connected to a plurality of groups of flexible steel wire ropes (7); the plurality of groups of flexible steel wire ropes (7) correspond to the plurality of groups of tension springs (6) in a one-to-one manner and are fixedly connected.

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