Combined protection device for broken mud roof in fully mechanized coal mining face

Abstract

This utility model discloses a combined protective device for the broken roof of a fully mechanized mining face, comprising a protective assembly consisting of a steel mesh, a ventilation duct, and a diamond mesh. The steel mesh is a monolithic grid-shaped steel mesh, and the ventilation duct is a double-layered duct, laid flat on top of the steel mesh. The ventilation duct is tied to the steel mesh at regular intervals along the long edges of both sides and in the middle, parallel to the long edges, using a first connecting wire bundle. The diamond mesh is laid flat below the steel mesh, and is tied to the steel mesh and ventilation duct at regular intervals along the long edges of both sides and in the middle, parallel to the long edges, using a second connecting wire bundle interleaved with the first connecting wire bundle. The protective assembly is fixed to the roof of the machine head, tail, and advance areas in the roadway's broken roof area or severely muddy roof area via a third connecting wire bundle along the roadway's direction. This can improve the safety and standardization level of the roof in the machine head, tail, and advance areas of the fully mechanized mining face.

Description

Technical Field

[0001] This utility model belongs to the field of roof support technology for fully mechanized coal mining faces, and specifically relates to a combined protection device for the yellow mud crushed roof of a fully mechanized coal mining face. Background Technology

[0002] In fully mechanized coal mining faces, especially at the head, tail, and advanced support areas, roof stability is crucial for safe production. Some mines have yellow mud interlayers in their fully mechanized roofs. These layers are easily disturbed and broken during mining operations, resulting in loose dust accumulating in the roof gaps and severely affecting the overall roof stability. In practice, the following problems often occur in areas affected by yellow mud layers: 1. Severe roof breakage and rock spillage: After mining, the yellow mud interlayers loosen and fall off, dropping into the head, tail, and advanced support areas as the working face supports move, causing a reduction in roadway cross-section and affecting passage and equipment operation. 2. Severe dust pollution: Yellow mud dust is easily dispersed during mining, support operations, and support movement, leading to increased dust concentration at the working face and increasing the dust hazards and difficulty of dust control in the working environment. 3. Difficulty in support and maintenance: Broken roof and dust block the support space, reduce the working resistance and support effect of the support, and affect the stable operation of the fully mechanized mining equipment and the standardized management of the roadway.

[0003] Existing measures mostly use thin plate beams or single-layer ventilation duct cloth for local protection, but the protective effect is limited. They cannot simultaneously prevent the falling of roof gangue and the accumulation of dust. The cleaning and maintenance workload is large, and there are repetitive operations, resulting in high labor intensity. Therefore, there is an urgent need for a device with a reasonable structure, convenient installation, and significant protective effect to improve the safety and standardization of the roof of the fully mechanized mining face at the head, tail, and advanced areas. Utility Model Content

[0004] To address the technical problems of roof breakage, rock spillage and leakage, easy dispersion and accumulation of yellow mud dust, and difficulty in support and maintenance caused by the erosion of the roof mud layer in fully mechanized longwall mining faces with high mining height, this utility model provides a combined protective device for the roof mud breakage in fully mechanized longwall mining faces.

[0005] This utility model provides the following technical solution: a combined protective device for the broken roof of yellow mud in a fully mechanized mining face, comprising several rectangular protective components. Each component includes a steel mesh, a ventilation duct cloth, and a diamond-shaped mesh. The steel mesh is a monolithic grid-shaped steel mesh. The ventilation duct cloth is a double-layered ventilation duct cloth, laid flat on top of the steel mesh. Along the long edges of the steel mesh on both sides and at regular intervals in the middle, parallel to the long edges, the ventilation duct cloth is bound to the ventilation duct cloth via a first connecting wire harness. The diamond-shaped mesh is laid flat below the steel mesh. Along the long edges of both sides of the diamond mesh and at regular intervals in the middle, the second connecting wire bundle is arranged interlaced with the first connecting wire bundle node and tied to the steel mesh and ventilation duct cloth. The protective assembly is fixed to the diamond mesh or steel mesh or the canopy beam of the roof of the machine head, tail and advanced area of ​​the roadway in the broken area of ​​the roof or the severely muddy roof area through the third connecting wire bundle along the direction of the roadway. When two adjacent protective assemblies overlap, the fourth connecting wire bundle is used for the overlap, and the overlap length is not less than 100mm.

[0006] Furthermore, the first and second connecting harnesses are secured with high-strength fire-resistant nylon cable ties, and the excess length is cut off after binding.

[0007] Furthermore, the first and second connecting harnesses use double-stranded 16# iron wire, wrapped at least 3 times.

[0008] Furthermore, the steel mesh is a woven steel mesh sheet with a specification of 1m×2m or 1m×1m, the diamond mesh is a diamond mesh roll with a width of 1m, and the duct cloth is a waste duct cloth with a diameter of 1m or 500mm.

[0009] Furthermore, the binding and fixing spacing between the first connecting wire harnesses is 200mm, and the binding and fixing spacing between the second connecting wire harnesses is 200mm.

[0010] Furthermore, the protective assembly is tied and fixed to the tunnel roof or the canopy beam is parallel to the tunnel roof.

[0011] Compared with the prior art, the combined protection device for the broken roof of the fully mechanized mining face provided by this utility model has the following beneficial effects:

[0012] 1. The use of a double-layer ventilation duct cloth combined with steel mesh and diamond mesh enhances overall strength and protective airtightness. It can not only bear the weight of crushed gangue but also effectively isolate dust, meeting multiple protection requirements of the working face. The combination structure of steel mesh, ventilation duct cloth, and diamond mesh forms a dense and stable protective layer, effectively preventing crushed gangue from falling from the roof, preventing the dispersion of yellow mud and dust, and ensuring the stability of the roof in the machine head, tail, and advanced areas.

[0013] 2. The protective assembly is simple to manufacture, lightweight, and easy to transport and install underground, shortening the construction cycle and reducing the labor intensity of workers. The protective device effectively reduces rockfall and dust accumulation, minimizing repetitive labor caused by cleaning equipment, roadways, and surface debris, thus improving operational efficiency. The application of this device reduces non-compliance issues in standardized inspections caused by crushed rock accumulation and dust pollution, enhancing the overall safety management level of the fully mechanized mining face.

[0014] 3. The main materials are conventional steel mesh, diamond mesh and waste ventilation duct cloth, which are widely available and inexpensive. They can be widely used in the protection of roadways affected by yellow mud in the head, tail and advance support areas of fully mechanized mining faces, and have good promotion value. Attached Figure Description

[0015] Figure 1 This is a plan view of the protective assembly of this utility model;

[0016] Figure 2 This is a side view of the protective assembly of this utility model.

[0017] In the diagram: 1-steel mesh; 2-ventilation duct fabric; 3-diamond mesh; 4-first connecting wire harness; 5-second connecting wire harness. Detailed Implementation

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] like Figure 1 and Figure 2 As shown, a combined protective device for the broken roof of a fully mechanized mining face in yellow mud includes several rectangular protective components. The protective components include a steel mesh 1, a ventilation duct cloth 2, and a diamond mesh 3. The steel mesh 1 is an integral grid-shaped steel mesh, and the ventilation duct cloth 2 is a double-layer ventilation duct cloth. The ventilation duct cloth 2 is laid flat on top of the steel mesh 1 and fixed to the steel mesh 1 by a first connecting wire bundle 4. The diamond mesh 3 is laid flat below the steel mesh 1 and fixed to the steel mesh 1 by a second connecting wire bundle 5. The second connecting wire bundle 5 also passes through the ventilation duct cloth 2 on the other side, which serves to reinforce and tighten it.

[0020] In this embodiment, the steel mesh 1 is a woven steel mesh sheet with a specification of 1m×2m, the duct cloth 2 is a waste duct cloth with a diameter of 1m, or a waste duct cloth with a diameter of 500mm can be folded in half and cut into 1m×2m sheets for later use, and the diamond mesh 3 can be a diamond mesh with a width of 1m, with no length requirement. When making the protective assembly, it is cut according to the required size of the protective assembly.

[0021] First, using the first connecting wire harness 4, the cut 1m×2m duct fabric 2 is double-layered and fixed to the 1m×2m woven steel mesh. The first connecting wire harness 4 is used to fix the duct fabric 2 at both long edges of the steel mesh 1, with a binding interval of 200mm. After the two edges of the duct fabric 2 are fixed to the steel mesh 1, the first connecting wire harness 4 is also used to bind and fix it at 200mm intervals in the middle of the duct fabric 2, parallel to the two long edges. Then, a 1m wide diamond mesh 3 is fixed to the other side of the steel mesh 1 using the second connecting wire harness 5. The second connecting wire harness 5 is also used to fix and bind it in the middle and at both long edges, with a binding interval of 200mm, and the binding and fixing nodes of the second connecting wire harness 3 are staggered with those of the duct fabric 2.

[0022] After the protective assembly is fabricated, it is secured to the roof diamond mesh or steel reinforcement mesh along the longwall mining face roadway using the third connecting wire harness. In areas with severe roof breakage or mud intrusion, the protective assembly can be secured to the U-shaped roof beam, parallel to the roadway roof. When adjacent protective assemblies are overlapped, the overlap length should be no less than 100mm, and the fourth connecting wire harness should be used for overlap and securing. The connecting wire harness can be made of high-strength fire-resistant nylon cable ties or double-strand 16# iron wire. When using high-strength fire-resistant nylon cable ties, cut off the excess length, and wrap the wire with double-strand 16# iron wire at least 3 times.

[0023] This combined protective device for the broken roof of the fully mechanized mining face is simple to manufacture, easy to install, and convenient to transport. It can be modularly customized to protect small areas of the broken roof in the face, as well as the head and tail sections. It can be used individually to protect small areas of the broken roof, or in groups to protect large areas. After using this protective device, the rate of rockfall during operation in the head, tail, and advance support sections of the fully mechanized mining face is reduced by 70%, and the accumulation of mud dust is reduced by 75%. This significantly reduces the workload of workers repeatedly cleaning up rock and mud dust accumulation, ensuring standardized dynamic compliance of the advance support areas at the head and tail of the fully mechanized mining face.

[0024] Taking a 30-meter section of the advanced support area in the transport roadway of the No. 15 coal longwall face of a certain mine as an example, the roof of the yellow mud is severely broken within the middle 10m of the advanced support. This section uses frame support. Before the use of the combined protection device for the yellow mud broken roof of the longwall face, each shift required 1 to 2 people to continuously clean the rock and yellow mud dust accumulation in the advanced support area. After adding protective components to protect the severely broken yellow mud roof area, a total of 20 sets of protective components were used, including 20 pieces of steel mesh 1, 40m² of diamond mesh 3, and 40m² of ventilation duct cloth 2. This greatly reduced the amount of rock falling and yellow mud dust accumulation in the severely broken yellow mud roof area. Each shift only needs simple cleaning after moving the frame, which takes less than 15 minutes.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined protective device for the broken roof of yellow mud in a fully mechanized mining face, characterized in that, The system includes several rectangular protective assemblies, including a steel mesh (1), a ventilation duct cloth (2), and a diamond mesh (3). The steel mesh (1) is a whole grid-shaped steel mesh, and the ventilation duct cloth (2) is a double-layer ventilation duct cloth. The ventilation duct cloth (2) is laid flat on top of the steel mesh (1) and is tied to the ventilation duct cloth (2) at regular intervals along the long edges of both sides of the steel mesh (1) and at the middle position parallel to the long edges of both sides through the first connecting wire bundle (4). The diamond mesh (3) is laid flat under the steel mesh (1) and is tied to the ventilation duct cloth (2) along the diamond mesh (3). At regular intervals, the second connecting wire bundle (5) is arranged at the long edges of both sides and the middle part parallel to the long edges of both sides, and is tied and fixed to the steel mesh (1) and the ventilation duct cloth (2) by intersecting with the nodes of the first connecting wire bundle (4). The protective assembly is fixed to the diamond mesh or steel mesh or the roof beam of the machine head, machine tail and advanced area of ​​the roadway in the crushed area or the severely muddy area of ​​the roadway roof through the third connecting wire bundle along the direction of the roadway. When two adjacent protective assemblies overlap, the fourth connecting wire bundle is used for overlap, and the overlap length is not less than 100mm.

2. The combined protection device for the broken roof of the fully mechanized mining face as described in claim 1, characterized in that, The first connecting harness (4) and the second connecting harness (5) are tied with high-strength fire-resistant nylon cable ties, and the excess length is cut off after tying.

3. The combined protective device for the broken roof of the fully mechanized mining face as described in claim 1, characterized in that, The first connecting harness (4) and the second connecting harness (5) are made of double-strand 16# iron wire, which is wound for no less than 3 turns.

4. The combined protective device for the broken roof of the fully mechanized mining face in accordance with claim 1, characterized in that, The steel mesh (1) is a woven steel mesh sheet with a specification of 1m×2m or 1m×1m, the diamond mesh (3) is a diamond mesh roll with a width of 1m, and the duct cloth (2) is a waste duct cloth with a diameter of 1m or 500mm.

5. The combined protective device for the broken roof of the fully mechanized mining face according to any one of claims 1 to 4, characterized in that, The binding and fixing spacing between the first connecting wire harness (4) is 200mm, and the binding and fixing spacing between the second connecting wire harness (5) is 200mm.

6. The combined protection device for the broken roof of the fully mechanized mining face as described in claim 1, characterized in that, The protective assembly is tied and fixed to the tunnel roof or the canopy beam is parallel to the tunnel roof.

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