A strong pulling force composite protective net for underground coal mine

Abstract

The utility model belongs to coal mine protection equipment technical field especially relates to a kind of coal mine underground strong pulling force composite protective net, in view of the problems that existing protective net connecting point is easy to loosen, anchoring force is insufficient and cannot be flexibly adapted to roadway size, present and propose the following scheme, including single body net belt, net belt butt joint component, net belt fixed component.The utility model adopts net belt and has high strength and corrosion-resistant characteristics;Net belt butt joint component can use bevel self-locking effect to make connecting point more and more tight when net belt is stressed;Net belt fixed component is pushed by the locking nut of the front end of tensioning rod by screwing, and promotes fixed pressing plate to compress net belt, and causes outer expansion support rod to be embedded into hole wall by radial expansion, form mechanical interlocking type anchoring, and the outer cladding layer of net belt is tightly clamped by the boss and the positioning cone, realize the mechanical interlocking between fixed pressing plate and protective net, completely prevent the relative slippage of both in use process.

Description

Technical Field

[0001] This utility model relates to a protective net, specifically a high-tensile composite protective net for underground coal mines, belonging to the technical field of coal mine protective equipment. Background Technology

[0002] In the field of underground coal mine roadway support, protective netting is a key facility for preventing rockfall and controlling roof stability. While traditionally widely used metal mesh has high initial strength, its inherent susceptibility to corrosion severely impacts its service life in the humid underground environment. Furthermore, it is heavy, inconvenient to install, and prone to breakage at joints due to stress concentration. In recent years, flexible polyester fiber netting, such as high-strength polyester fiber flexible netting for mining, has emerged. Utilizing high-strength polyester filaments and coating technology, it is gradually being adopted due to its lightweight, flame-retardant, anti-static, and high efficiency for large-area installation. Its tensile strength can even reach more than twice that of traditional metal mesh, effectively overcoming the corrosion problem of metal mesh and improving support efficiency to a certain extent.

[0003] However, these flexible nets still have obvious defects in practical applications: the connections between the net panels are usually weak, and the connection points are prone to loosening when subjected to roof pressure or surrounding rock deformation, affecting the overall stability; at the same time, their anchoring methods mostly rely on traditional friction-type anchor bolts or anchor cables, which have insufficient anchoring force in soft and broken coal seams, making it difficult to form a durable and effective support. For example, a mining safety protection device disclosed in announcement number CN223447095U, although it mitigates the direct impact of the impact force on the protective net by setting a buffer mechanism, reducing the risk of the net body breaking due to instantaneous high stress concentration, does not solve the fundamental problems of connection reliability and insufficient anchoring force in the protective net itself and the fixing method to the well wall. For example, the retractable and detachable multi-functional rock retaining net disclosed in announcement number CN222254015U for high-extraction supports mainly focuses on the retractable adjustment function of the rock retaining net to adapt to changes in the height of the hydraulic support and facilitate pedestrian passage. However, its structure is complex and it has not optimized the automatic locking mechanism between the protective net modules and the active pressurization mechanism of the anchoring components, making it unsuitable for high-strength support scenarios for large-area roadway sidewalls and roofs. In summary, existing protective nets, whether traditional metal nets, emerging polyester fiber flexible nets, or protective devices in existing patents, all have shortcomings in terms of rapid and reliable splicing between net panels, self-locking and anti-loosening of connection points, and providing continuous and efficient anchoring force under complex coal seam conditions. Summary of the Invention

[0004] This utility model provides a high-tensile composite protective net for underground coal mines to solve the problems of easy loosening of connection points, insufficient anchoring force, and inability to flexibly adapt to roadway dimensions.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a strong tensile composite protective net for underground coal mines, including a protective net, the protective net including multiple individual net belts, adjacent individual net belts are connected by net belt docking components, and the individual net belts and splicing parts are connected by net belt fixing components. A single mesh belt consists of multiple longitudinally and transversely woven strips, each strip including steel wire and an outer covering layer; The mesh belt docking assembly includes a docking base. The docking base has wedge-shaped slots at both ends. A wedge-shaped block is movably placed in the wedge-shaped slot. The wedge-shaped block has a positioning groove. The outermost strip of the individual mesh belt is placed in the positioning groove. When the individual mesh belt is under force, the wedge-shaped block is locked in the wedge-shaped slot. The mesh belt fixing assembly includes a fixed pressure plate and a pull rod. A fixed bottom tube is fixedly connected to the rear end of the pull rod. A tapered end sleeve and a movable insertion tube are movably fitted on the pull rod body. The fixed pressure plate and the movable insertion tube are coaxially connected. The tapered end sleeve is located between the fixed bottom tube and the movable insertion tube. Multiple outward expansion support rods are connected to the opposite ends of the fixed bottom tube and the movable insertion tube, and the two outward expansion support rods are staggered relative to each other.

[0006] As a further improvement of this utility model: each strip of the single mesh belt includes multiple parallel steel wires, and an outer covering layer is wrapped around the outside of the multiple parallel steel wires.

[0007] As a further improvement of this utility model: a docking groove is provided in the middle part of the docking base, a docking block is placed in the docking groove, a limiting post is vertically connected to the center of the bottom surface of the docking groove, a limiting groove is provided at the center of the bottom surface of the docking block, and the limiting post is inserted into the limiting groove for limiting.

[0008] As a further improvement of this utility model: the two sides of the wedge-shaped slot are provided with a through-slot, and the outermost strip of the single mesh belt, which is placed in the slot, moves through the through-slot on both sides.

[0009] As a further improvement of this utility model: the two sides of the limiting groove are provided with outwardly protruding limiting slopes, the upper end of the limiting post is provided with an inner folded cavity, the two sides of the upper end of the limiting post are connected with limiting blocks, and the limiting blocks fit and connect with the limiting slopes when the limiting post is inserted into the limiting groove. A spring is provided in the inner folded cavity, and the upper end of the spring abuts against the top groove wall of the limiting groove.

[0010] As a further improvement of this utility model: the fixing plate of the mesh belt fixing component has a rod through hole at its center. The fixing plate is movably sleeved on the pull rod through the rod through hole. The front end of the pull rod has a threaded ring, and a locking nut is threadedly connected to the threaded ring.

[0011] As a further embodiment of this utility model: the pull rod with a threaded ring has a strip-shaped alignment groove, and the wall of the hole in the rod body of the fixing plate is connected to an alignment block, and the alignment block is movably locked in the strip-shaped alignment groove.

[0012] As a further improvement of this utility model: an anti-loosening wedge is also installed in the strip alignment groove, and the anti-loosening wedge is embedded in the strip alignment groove at the connection between the locking nut and the pull rod.

[0013] As a further improvement of this utility model: the fixing plate is closely attached to one side of the single mesh belt and has multiple protrusions. The protrusions are respectively set to correspond one-to-one with the cross points of the single mesh belt strips. Each protrusion is connected to four positioning cones, and a gap is left between adjacent positioning cones for the strips to pass through.

[0014] The beneficial effects of this utility model are: 1. This utility model is equipped with multiple individual mesh belts, mesh belt docking components, and mesh belt fixing components. The entire protective net is formed by splicing and combining multiple individual mesh belts. It can be assembled according to the specific size and shape of the coal mine wall. The mesh belt fixing components are used to fix the splicing parts to ensure that the formed protective net is connected as a whole. The mesh belt fixing components can realize the fixed connection between the protective net and the coal mine wall.

[0015] 2. The single mesh belt of this utility model includes multiple longitudinally and transversely woven strips. Each strip includes steel wire and an outer covering layer. The single mesh belt adopts a longitudinally and transversely woven strip structure. Each strip uses steel wire as the load-bearing skeleton and is fully wrapped by the outer covering layer. This composite structure enables the mesh belt to have both the high strength of metal materials and the corrosion resistance, flame retardancy and antistatic properties of plastic materials, thus solving the defects of traditional metal mesh being prone to rust and plastic mesh having insufficient strength from the source.

[0016] 3. The mesh belt docking assembly of this utility model includes a docking base. The docking base has wedge-shaped slots at both ends. Wedge-shaped blocks are movably placed in the wedge-shaped slots. The wedge-shaped blocks have positioning grooves. The outermost strip of the individual mesh belt is placed in the positioning groove. When the individual mesh belt is under force, the wedge-shaped blocks are locked in the wedge-shaped slots. Through the cooperation of the docking base and the wedge-shaped slots and wedge-shaped blocks at both ends, the modular individual mesh belts can be quickly spliced. The positioning grooves on the wedge-shaped blocks are used to accurately lock the outermost strip of the individual mesh belt. The inclined design makes the wedge-shaped blocks generate a self-locking effect in the wedge-shaped slots when the mesh belt is under force, forming a locking effect that gets tighter as it is pulled, preventing the connection points from loosening over time.

[0017] 4. The mesh belt fixing component of this utility model includes a fixed pressure plate and a pull rod. A fixed bottom pipe is fixedly connected to the rear end of the pull rod. A tapered end sleeve and a movable insertion tube are movably sleeved on the pull rod body. The fixed pressure plate and the movable insertion tube are coaxially connected. The tapered end sleeve is located between the fixed bottom pipe and the movable insertion tube. Multiple outward expansion struts are connected to the opposite ends of the fixed bottom pipe and the movable insertion tube. The two outward expansion struts are staggered relative to each other. The mesh body and the well wall are reliably anchored through the cooperation of the fixed pressure plate and the pull rod. The fixed bottom pipe, tapered end sleeve and movable insertion tube inside are relatively displaced under the action of the pull rod, which pushes the staggered outward expansion struts to expand radially, forming a multi-point mechanical interlock. It is suitable for soft and broken coal seam conditions and can provide anchoring force far exceeding that of friction anchor bolts. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the strip structure of the single mesh belt of this utility model; Figure 3 This is a schematic diagram of the mesh belt docking assembly structure of this utility model; Figure 4 This is a schematic cross-sectional view of the mesh belt docking assembly of this utility model; Figure 5 This is a schematic diagram of the disassembled cross-sectional structure of the mesh belt docking assembly of this utility model; Figure 6 This is a front view structural diagram of the mesh belt fixing component of this utility model; Figure 7 This is a schematic diagram of the connection structure between the pull rod and the locking nut of this utility model; Figure 8 This is a rear view schematic diagram of the mesh belt fixing component of this utility model; Figure 9 This is a schematic diagram of the disassembled structure of the mesh belt fixing component of this utility model; Figure 10 This is a schematic diagram of the connection structure between the fixed pressure plate and the boss in this utility model.

[0019] In the diagram: 1. Single mesh belt; 11. Outer covering layer; 12. Steel wire; 2. Mesh belt docking assembly; 21. Docking base; 22. Docking block; 23. Wedge groove; 24. Wedge block; 25. Positioning groove; 26. Limiting groove; 27. Docking groove; 28. Limiting post; 29. ​​Belt through groove; 210. Limiting inclined surface; 211. Inner fold cavity; 212. Limiting block; 213. Spring; 3. Mesh belt fixing assembly; 31. Fixing pressure plate; 32. Pull rod; 33. Conical end sleeve; 34. Fixing bottom tube; 35. Movable insertion tube; 36. Outward expansion support rod; 37. Boss; 38. Positioning cone; 39. Threaded ring; 310. Strip alignment groove; 311. Rod through hole; 312. Alignment block; 313. Locking nut; 314. Anti-loosening wedge block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1 like Figures 1 to 10 As shown, a high-tensile composite protective net for underground coal mines includes a protective net comprising multiple individual mesh belts 1. Adjacent individual mesh belts 1 are connected by mesh belt docking components 2. The body and splicing parts of the individual mesh belts 1 are connected by mesh belt fixing components 3. In use, the mesh belt fixing components 3 are fixedly embedded in the coal mine wall. The entire protective net is formed by splicing and combining multiple individual mesh belts 1. It can be assembled according to the specific size and shape of the coal mine wall, and fixed at the splicing parts by the mesh belt fixing components 3 to ensure that the formed protective net is connected as a whole. The mesh belt fixing components 3 can realize the fixed connection between the protective net and the coal mine wall. The single mesh belt 1 consists of multiple longitudinally and transversely woven strips, each strip including a steel wire 12 and an outer covering layer 11. The single mesh belt 1 adopts a longitudinally and transversely woven strip structure, with each strip using the steel wire 12 as the load-bearing skeleton and being fully wrapped by the outer covering layer 11. This composite structure enables the mesh belt to possess both the high strength of metal materials and the corrosion resistance, flame retardancy, and antistatic properties of plastic materials, thus solving the defects of traditional metal mesh being prone to rust and plastic mesh having insufficient strength from the source. The mesh belt docking assembly 2 includes a docking base 21. The docking base 21 has wedge-shaped slots 23 at both ends. Wedge-shaped blocks 24 are movably locked in the wedge-shaped slots 23. The wedge-shaped blocks 24 have locking grooves 25. The outermost strip of the individual mesh belt 1 is locked in the locking grooves 25. When the individual mesh belt 1 is under force, the wedge-shaped blocks 24 are locked in the wedge-shaped slots 23. Through the cooperation of the docking base 21 and the wedge-shaped slots 23 and wedge-shaped blocks 24 at both ends, the modular individual mesh belt 1 can be quickly spliced. The locking grooves 25 on the wedge-shaped blocks 24 are used to accurately lock the outermost strip of the individual mesh belt 1. The inclined design makes the wedge-shaped blocks 24 generate a self-locking effect in the wedge-shaped slots 23 when the mesh belt is under force, forming a locking effect that gets tighter as it is pulled, preventing the connection point from loosening over time. The mesh belt fixing assembly 3 includes a fixed pressure plate 31 and a pull rod 32. A fixed bottom pipe 34 is fixedly connected to the rear end of the pull rod 32. A tapered end sleeve 33 and a movable insertion pipe 35 are movably sleeved on the body of the pull rod 32. The fixed pressure plate 31 and the movable insertion pipe 35 are coaxially connected. The tapered end sleeve 33 is located between the fixed bottom pipe 34 and the movable insertion pipe 35. Multiple outward expansion struts 36 are connected to the opposite ends of the fixed bottom pipe 34 and the movable insertion pipe 35. The two outward expansion struts 36 are staggered relative to each other. The mesh body and the well wall are reliably anchored through the cooperation of the fixed pressure plate 31 and the pull rod 32. The fixed bottom pipe 34, tapered end sleeve 33 and movable insertion pipe 35 inside are relatively displaced under the action of the pull rod 32, which pushes the staggered outward expansion struts 36 to expand radially, forming a multi-point mechanical interlock. It is suitable for soft and broken coal seam conditions and can provide anchoring force far exceeding that of friction anchor bolts.

[0022] Example 2 Improvements based on Example 1: like Figure 1 and Figure 2 As shown, each strip of the single mesh belt 1 includes multiple parallel steel wires 12. The outer covering layer 11 wraps around the outside of the multiple parallel steel wires 12. The multiple parallel steel wires 12 share the load, which improves the tensile strength of the strip and enhances its bending stiffness. It effectively prevents the mesh from getting caught under the pressure of the roof. When individual steel wires 12 break due to manufacturing defects or local overload, the remaining parallel steel wires 12 can still continue to bear the load. The overall wrapping of the multiple parallel steel wires 12 by the outer covering layer 11 ensures the bonding strength between the plastic and the steel wires, prevents the separation of layers during use, and provides all-round anti-corrosion protection for the internal steel wires 12, completely isolating them from the erosion of moisture and corrosive media in the well.

[0023] like Figure 1 , Figures 3 to 5As shown, a docking groove 27 is provided in the middle of the docking base 21, and a docking block 22 is placed in the docking groove 27. A limiting post 28 is vertically connected to the center of the bottom surface of the docking groove 27. A limiting groove 26 is provided at the center of the bottom surface of the docking block 22. The limiting post 28 is inserted into the limiting groove 26 for limiting. During splicing, the docking base 21 achieves initial docking through the engagement of the docking block 22 and the docking groove 27. The insertion of the limiting post 28 and the limiting groove 26 ensures the precise radial positioning of the connection point and ensures that the docking block 22 can seal the docking groove 27 to prevent the wedge-shaped block 24 from falling out of the wedge-shaped groove 23.

[0024] Furthermore, the two side walls of the wedge-shaped slot 23 are provided with through-strip grooves 29. The outermost strip of the individual mesh belt 1, which is placed in the positioning slot 25, moves through the through-strip grooves 29 on both sides. The through-strip grooves 29 provide a passage path and sufficient operating space for the installation of the mesh belt, enabling workers to quickly and accurately guide the edge strip of the mesh belt into the positioning slot 25 of the wedge-shaped block 24 in the limited space downhole, which greatly improves the installation efficiency. Moreover, after the installation is completed, the side wall of the through-strip groove 29 and the mesh belt passing through it form a cooperative relationship, providing additional lateral restraint when the mesh belt is under tension, preventing the mesh belt from lateral displacement or torsion in the wedge-shaped block 24, and ensuring the stability of the force direction.

[0025] Furthermore, the two sides of the limiting groove 26 are provided with outwardly protruding limiting slopes 210, and the upper end of the limiting post 28 is provided with an inner folded cavity 211. Limiting blocks 212 are connected to both sides of the upper end of the limiting post 28, and the limiting blocks 212 fit and mate with the limiting slopes 210 when the limiting post 28 is inserted into the limiting groove 26. A spring 213 is provided in the inner folded cavity 211, and the upper end of the spring 213 abuts against the top groove wall of the limiting groove 26. Through the inner folded cavity 211, the limiting post 28 can be smoothly inserted into the limiting groove 26, and the limiting blocks 212 can be locked in the limiting slopes 210 to achieve self-locking of the mating part and prevent the mating block 22 from disengaging from the mating groove 27.

[0026] like Figure 1 , Figures 6 to 10 As shown, the fixing plate 31 of the mesh belt fixing component 3 has a rod through hole 311 at its center. The fixing plate 31 is movably sleeved on the pull rod 32 through the rod through hole 311. The front end of the pull rod 32 has a threaded ring 39, and a locking nut 313 is threadedly connected to the threaded ring 39. By rotating the locking nut 313, the fixing plate 31 is pushed to move axially along the pull rod 32, thereby applying a controllable clamping force to the protective mesh and the well wall surface, and realizing the active support function.

[0027] Furthermore, the pull rod 32 has a threaded ring 39 and a strip-shaped alignment groove 310. The wall of the hole 311 in the rod body of the fixed pressure plate 31 is connected to an alignment block 312, and the alignment block 312 is movably locked in the strip-shaped alignment groove 310. By movably locking the alignment block 312 in the strip-shaped alignment groove 310, it is ensured that the fixed pressure plate 31 will not rotate during the tightening of the locking nut 313, thus preventing the circumferential movement of the fixed pressure plate 31. This ensures that the axial force generated when rotating the locking nut 313 is completely converted into the clamping force on the mesh belt. Secondly, the sliding fit between the strip-shaped alignment groove 310 and the alignment block 312 also ensures that the fixed pressure plate 31 can only be sleeved with the pull rod 32 at a unique installation angle, thereby ensuring that the outward expansion support rod 36 connected to the opposite ends of the fixed bottom tube 34 and the movable insertion tube 35 is set in a staggered manner.

[0028] Furthermore, an anti-loosening wedge 314 is also inserted into the strip alignment groove 310, and the anti-loosening wedge 314 is embedded in the strip alignment groove 310 at the connection between the locking nut 313 and the pull rod 32. In addition to limiting the position of the fixed pressure plate 31 by using the strip alignment groove 310 to limit the installation angle of the fixed pressure plate 31, the anti-loosening wedge 314 can also be inserted into the strip alignment groove 310 to lock the locking nut 313, blocking any rotational escape path of the locking nut 313 relative to the pull rod 32. During installation, after the locking nut 313 is tightened in place, the anti-loosening wedge 314 is embedded in the designated position to achieve permanent anti-loosening. The operation is simple and the effect is reliable.

[0029] Furthermore, the fixing plate 31 is closely attached to one side of the single mesh belt 1 and has multiple protrusions 37 connected to it. Each protrusion 37 corresponds to one of the cross points of the strips of the single mesh belt 1. Each protrusion 37 is connected to four positioning cones 38. There is a gap between adjacent positioning cones 38 to allow the strips to pass through. The protrusions 37 change the contact between the fixing plate 31 and the mesh belt from surface contact to point contact, concentrating the clamping force on the most critical cross points of the strips, which greatly improves the clamping efficiency. The arrangement of the four positioning cones 38 forms a natural positioning grid, which automatically guides the cross points of the strips to fall into the area enclosed by the positioning cones 38 during installation. At this time, the positioning cones 38 will penetrate or tightly lock the outer covering layer 11 of the mesh belt, realizing the mechanical interlock between the fixing plate 31 and the protective net, and completely preventing relative slippage between the two during use.

[0030] Working principle: Each individual mesh belt 1 is composed of composite strips woven longitudinally and transversely. The inside of the strips is provided with multiple parallel steel wires 12 as a load-bearing skeleton, and the outside is fully wrapped by a flame-retardant and anti-static outer coating layer 11. This structure gives the mesh belt both high strength and corrosion resistance.

[0031] When support work is required, the adjacent individual mesh belts 1 are first connected into a whole by the mesh belt docking assembly 2. The outermost strip of the individual mesh belt 1 is inserted into the locking groove 25 of the wedge-shaped locking block 24. Then, the wedge-shaped locking block 24 is placed into the wedge-shaped locking groove 23 of the docking base 21 to complete the initial splicing. At this time, if the protective net is subjected to the pressure of the surrounding rock, the tension will be transmitted to the connection point, forcing the wedge-shaped locking block 24 to move along the inclined surface of the wedge-shaped locking groove 23 and form a self-locking effect, realizing the mechanical characteristic of tightening as it is pulled.

[0032] The final fixing of the protective net is achieved through the mesh belt fixing component 3. During installation, the fixed bottom tube 34 with the outward expansion support rod 36 and the movable insertion tube 35 are first inserted into the drilled hole. The locking nut 313 at the front end of the pull rod 32 is rotated to push the fixed pressure plate 31 to move along the pull rod 32. At this time, the fixed pressure plate 31 is prevented from rotating by the cooperation of the alignment block 312 and the strip alignment groove 310, ensuring that the clamping force is completely converted into axial thrust. As the locking nut 313 is tightened, the fixed bottom tube 34 and the movable insertion tube 35 are... Under the action of the tapered end sleeve 33, they move closer together, pushing the misaligned outward expansion support rod 36 to expand radially and embed into the hole wall to form a mechanical interlock. After the locking nut 313 is tightened, the anti-loosening wedge 314 is embedded in the strip alignment groove 310 to achieve permanent anti-loosening. The boss 37 on the fixed pressure plate 31 corresponds one-to-one with the intersection point of the strip. The four positioning cones 38 on each boss 37 penetrate into the outer covering layer 11 of the mesh belt when pressed to form a mechanical interlock. The gap between adjacent positioning cones 38 ensures that the strip is not damaged.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-tensile composite protective net for underground coal mines, comprising a protective net, characterized in that: The protective net includes multiple individual mesh belts (1), and mesh belt docking components (2) are connected between adjacent individual mesh belts (1). Mesh belt fixing components (3) are connected to the body and splicing parts of the individual mesh belts (1). The single mesh belt (1) includes multiple longitudinally and transversely woven strips, each strip including steel wire (12) and an outer covering layer (11). The mesh belt docking assembly (2) includes a docking base (21). The docking base (21) has wedge-shaped slots (23) at both ends. A wedge-shaped block (24) is movably placed in the wedge-shaped slot (23). The wedge-shaped block (24) has a slot (25). The outermost strip of the single mesh belt (1) is placed in the slot (25). The wedge-shaped block (24) is locked in the wedge-shaped slot (23) when the single mesh belt (1) is under force. The mesh belt fixing assembly (3) includes a fixed pressure plate (31) and a pull rod (32). The pull rod (32) is fixedly connected to a fixed bottom tube (34) at its rear end. The pull rod (32) is movably fitted with a tapered end sleeve (33) and a movable insertion tube (35). The fixed pressure plate (31) and the movable insertion tube (35) are coaxially connected. The tapered end sleeve (33) is located between the fixed bottom tube (34) and the movable insertion tube (35). The fixed bottom tube (34) and the movable insertion tube (35) are each connected to a plurality of outward expansion support rods (36) at their opposite ends, and the two outward expansion support rods (36) are staggered relative to each other.

2. The high-tensile composite protective net for underground coal mines according to claim 1, characterized in that: Each strip of the single mesh belt (1) includes multiple parallel steel wires (12), and the outer covering layer (11) is wrapped around the outside of the multiple parallel steel wires (12).

3. The high-tensile composite protective net for underground coal mines according to claim 1, characterized in that: The docking base (21) has a docking groove (27) in the middle, and a docking block (22) is placed in the docking groove (27). A limiting post (28) is vertically connected to the center of the bottom surface of the docking groove (27). A limiting groove (26) is opened at the center of the bottom surface of the docking block (22), and the limiting post (28) is inserted into the limiting groove (26) for limiting.

4. The high-tensile composite protective net for underground coal mines according to claim 3, characterized in that: The two sides of the wedge-shaped groove (23) are provided with through grooves (29), and the outermost strip of the single mesh belt (1) placed in the slot (25) moves through the through grooves (29) on both sides.

5. The high-tensile composite protective net for underground coal mines according to claim 4, characterized in that: The two sides of the limiting groove (26) are provided with outwardly protruding limiting inclined surfaces (210). The upper end of the limiting post (28) is provided with an inner folded cavity (211). The two sides of the upper end of the limiting post (28) are connected to limiting blocks (212). When the limiting post (28) is inserted into the limiting groove (26), the limiting blocks (212) fit and connect with the limiting inclined surfaces (210). The inner folded cavity (211) is provided with a spring (213). The upper end of the spring (213) abuts against the top groove wall of the limiting groove (26).

6. The high-tensile composite protective net for underground coal mines according to claim 1, characterized in that: The fixing plate (31) of the mesh belt fixing component (3) has a rod through hole (311) at its center. The fixing plate (31) is movably sleeved on the pull rod (32) through the rod through hole (311). The front end of the pull rod (32) has a threaded ring (39), and a locking nut (313) is threadedly connected to the threaded ring (39).

7. The high-tensile composite protective net for underground coal mines according to claim 6, characterized in that: The pull rod (32) has a threaded ring (39) and a strip-shaped alignment groove (310) on its body. The wall of the rod through hole (311) of the fixed pressure plate (31) is connected to an alignment block (312), and the alignment block (312) is movably locked in the strip-shaped alignment groove (310).

8. The high-tensile composite protective net for underground coal mines according to claim 7, characterized in that: An anti-loosening wedge (314) is also inserted in the strip alignment groove (310), and the anti-loosening wedge (314) is embedded in the strip alignment groove (310) at the connection between the locking nut (313) and the pull rod (32).

9. The high-tensile composite protective net for underground coal mines according to claim 8, characterized in that: The fixed pressure plate (31) is closely attached to one side of the single mesh belt (1) and has multiple protrusions (37). The protrusions (37) are respectively set to correspond one-to-one with the cross points of the strips of the single mesh belt (1). Each protrusion (37) is connected to four positioning cones (38), and there is a gap between adjacent positioning cones (38) to allow the strips to pass through.

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