A gangue blocking device for gob-side entry retaining in a coal mine underground and a use method thereof

Abstract

The application discloses a kind of for coal mine underground along empty roadway and its use method, the device includes sequentially fixedly arranged in goaf first mounting column, second mounting column and third mounting column;The side of the third mounting column is slidably provided with a positioning gangue blocking assembly;The upper and lower sides of the third mounting column are also symmetrically provided with fixed blocks fixedly connected thereto, and a plurality of sliding gangue blocking assemblies are provided between the two fixed blocks;Further comprising a guide belt, the guide belt is hinged by a plurality of metal sheets, a chute is provided at the middle position of the guide belt, one end of the guide belt is rotatably connected to the first mounting column, and the other end of the guide belt is provided with a traction assembly.Compared with the prior art, the application does not need to level the ground before building the gangue wall, and saves the cost and reduces the operation difficulty;especially for some gangue wall building effect better on slope.

Description

Technical Field

[0001] This invention relates to the field of underground coal mining technology, specifically to a rock-blocking device for underground coal mine goaf retention and its usage method. Background Technology

[0002] To recover the protective coal pillars left in traditional mining methods, the original mining roadway is maintained along the edge of the goaf after the coal face. This is called goaf retention, which means that a roadway is reserved along the boundary of the goaf behind the working face for use by the next section of the working face. Goaf retention not only reduces the amount of roadway excavation and alleviates the contradiction between mining and tunneling, but also has many advantages such as shortening the working face relocation time, eliminating isolated working faces, improving the coal resource recovery rate, preventing coal seam spontaneous combustion, and extending the service life of the mine. At the same time, the goaf retention technology also has great advantages in controlling major coal mine accidents and disasters.

[0003] Rock retaining walls are a measure used in coal mining or other underground engineering projects to reinforce transport roadways and prevent rocks or other debris from entering and affecting mining operations. Rock retaining walls are typically constructed from multiple layers of steel mesh, wooden planks, steel plates, etc., and are installed above the transport roadway to withstand pressure and impact forces from above. Rock retaining walls should be used in conjunction with a support system to ensure the stability and safety of the roadway. In coal mining, rock retaining walls are mainly used for the protection of the advance and retreat spaces of mine roadways, the boundary zones of goaf areas, and other spaces required for segmented tunneling. Rock retaining walls have advantages such as being lightweight, easy to install, and having a high load-bearing capacity, and have become an important component of coal mine roadway support technology.

[0004] A Chinese patent with publication number CN105927255A discloses a device for preventing rockfall in gob-side retaining roadways using crushed stone. In this device, during the advancement of the hydraulic support, front and rear telescopic control components mounted on the hydraulic support extend synchronously, causing the rockfall retaining plate to extend backward. When the hydraulic support advances to a set distance, the front and rear telescopic control components stop extending synchronously. The extended rockfall retaining plate can prevent rockfall from the gob area from entering the gob-side retaining roadway. However, in this prior art, due to the uneven surface of underground coal mines and the need for movement, a leveled ground and track laying are required, and guide wheels matching the track are installed at the bottom of the rockfall retaining plate, resulting in high operating costs. Summary of the Invention

[0005] The purpose of this invention is to provide a rock-blocking device for underground goaf retention in coal mines and its usage method, thereby solving the aforementioned technical problems.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A rock-blocking device for underground goaf retention in coal mines includes a first mounting column, a second mounting column, and a third mounting column, which are sequentially fixedly installed in the goaf area. A positioning rock-blocking component is slidably installed on one side of the third mounting column. Fixed blocks are symmetrically arranged on the upper and lower sides of the third mounting column and fixedly connected thereto. Several sliding rock-blocking components are arranged between two of the fixed blocks. The device also includes a guide belt, which is made of several metal sheets hinged together. A groove is provided in the middle of the guide belt. One end of the guide belt is rotatably connected to the first mounting column, and the other end of the guide belt is provided with a traction component.

[0008] As a further aspect of the present invention: the positioning and blocking component includes a first blocking plate slidably connected to the third mounting post and a second blocking plate slidably disposed on the upper side of the first blocking plate, wherein an elastic component is disposed between the first blocking plate and the second blocking plate.

[0009] As a further aspect of the present invention: the elastic component includes a positioning block disposed on one side of the second rock-blocking plate and fixedly connected to the first rock-blocking plate, and a first limiting rod fixedly connected to the bottom of the second rock-blocking plate. The first limiting rod passes through the positioning block and is slidably connected to it. The positioning block is provided with a first limiting pin, and the first limiting rod is provided with a first pin hole that cooperates with the first limiting pin. An elastic element is disposed between the second rock-blocking plate and the positioning block.

[0010] As a further aspect of the present invention: the sliding rock-blocking assembly includes a first rock-blocking plate, a second rock-blocking plate, and an elastic component, and the bottom of the first limiting rod is rotatably connected to a second limiting rod, and the second limiting rod is threadedly connected to a slider that matches the guide belt groove, and the first rock-blocking plate is provided with mounting holes corresponding to the slider.

[0011] As a further aspect of the present invention: the first rock-blocking plate is fixedly connected to a mounting plate and a sliding pin on the side near the traction assembly, and the sliding rock-blocking assembly further includes a lifting assembly. The lifting assembly includes a pin groove disposed on the first rock-blocking plate and matching the sliding pin, and a first limiting plate slidably disposed on the first rock-blocking plate. A baffle fixedly connected to the first rock-blocking plate is disposed on one side of the first limiting plate, and a threaded rod is rotatably connected to the baffle. The threaded rod passes through the first limiting plate and is threadedly connected to it.

[0012] As a further aspect of the present invention: the traction assembly includes a connector for connecting with a traction machine, a lifting rod is fixedly mounted on the connector, a pulley is slidably connected to the lifting rod, and one end of the guide belt is fixedly connected to the pulley.

[0013] As a further aspect of the present invention: a first rotating wheel is provided between the guide belt and the first mounting post, the first rotating wheel is rotatably connected to the first mounting post, one end of the guide belt is fixedly connected to the first rotating wheel, and excess guide belt is wound around the first rotating wheel; a second rotating wheel is provided on the second mounting post and is rotatably connected thereto.

[0014] As a further aspect of the present invention, a second limiting plate is fixedly connected to the first rock-blocking plate.

[0015] A method for using a rock-blocking device for underground gob-side roadway retention in coal mines includes the following steps:

[0016] S1: Fix the first, second, and third installation columns in sequence within the goaf, with the upper and lower surfaces of the installation columns abutting against the upper and lower parts of the goaf, respectively.

[0017] S2: Install the positioning and blocking component onto one side of the third mounting column, and slide the first blocking plate on the positioning and blocking component so that its bottom contacts the lower part of the goaf, contacting the first limiting pin to lock the first limiting rod, and the second blocking plate rises under the action of the elastic element and abuts against the upper part of the goaf.

[0018] S3: Pull the guide belt out from the wound state, pass it through the second wheel on the second mounting column, and then fix the connector to the traction machine;

[0019] S4: Slide the sliding block assembly off the fixed block, rotate the second limiting rod so that the guide belt is between the second limiting rod and the first block plate, install the slider, and push the sliding block assembly to slide on the guide belt;

[0020] S5: Move the sliding block assembly to one side of the positioning block assembly, loosen part of the slider, align the pin groove in the moving sliding block assembly with the sliding pin on the positioning block assembly, determine the approximate position of the sliding pin, and adjust the first limit plate to position it directly above the sliding pin.

[0021] S6: Insert the sliding pin into the pin groove and fully release the slider. Move the sliding block assembly away from the guide belt and push the first block plate inward until it is flush with the adjacent first block plate. Rotate the second limiting rod into the slot of the second limiting plate to ensure that it is flush with the adjacent first block plate.

[0022] S7: Rotate the threaded rod to adjust the position of the first limiting plate to rise, so that the position of the first blocking plate drops under the action of gravity until its bottom contacts the lower part of the goaf and contacts the first limiting pin to lock the first limiting rod. The position of the second blocking plate rises under the action of the elastic element and abuts against the upper part of the goaf.

[0023] S8: Repeat steps S4-S7 until all sliding retaining wall components are installed.

[0024] The beneficial effects of this invention are as follows: In this invention, a retaining wall is constructed based on a positioning retaining component and an installation column, with a sliding retaining component as an extension; and a guide belt is used as a guide and support during the movement of the sliding retaining component, allowing for position adjustment and connection with adjacent sliding retaining components after reaching the designated position. This eliminates the need for ground leveling and laying specific tracks before constructing the retaining wall, saving costs and reducing operational difficulty; the construction effect is particularly good for retaining walls on slopes. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structure of a rock-blocking device for underground goaf retention in coal mines according to the present invention;

[0027] Figure 2 This is a schematic diagram of the connection structure between the third mounting post and the sliding retaining wall assembly of the present invention;

[0028] Figure 3 This is a schematic diagram showing the movement direction of the guide belt of the present invention;

[0029] Figure 4 This is a schematic diagram of the connection structure between the second limiting rod and the first limiting rod of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the first baffle plate of the present invention.

[0031] In the diagram: 1. First mounting post; 2. Second mounting post; 3. Third mounting post; 4. Fixing block; 5. First baffle plate; 6. Second baffle plate; 7. Elastic element; 8. First limiting rod; 9. First pin hole; 10. First limiting pin; 11. Second limiting plate; 12. Connecting piece; 13. Lifting rod; 14. Pulley; 15. Guide belt; 16. Mounting plate; 17. Sliding pin; 18. Pin groove; 19. Baffle; 20. Threaded rod; 21. Mounting hole; 22. Slider; 23. First rotating wheel; 24. Second rotating wheel; 25. Second limiting rod; 26. Positioning block; 27. First limiting plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-5 As shown, the present invention is a rock-blocking device for underground goaf-retaining roadways in coal mines, comprising a first mounting column 1, a second mounting column 2, and a third mounting column 3, which are sequentially fixedly installed in the goaf area; a positioning rock-blocking component is slidably installed on one side of the third mounting column 3; fixing blocks 4 are symmetrically arranged on the upper and lower sides of the third mounting column 3 and fixedly connected thereto, and several sliding rock-blocking components are arranged between two of the fixing blocks 4; it also includes a guide belt 15, which is made of several metal sheets hinged together, and a sliding groove is provided in the middle of the guide belt 15; one end of the guide belt 15 is rotatably connected to the first mounting column 1, and the other end of the guide belt 15 is provided with a traction component.

[0034] In a preferred embodiment of the present invention, the positioning and blocking component includes a first blocking plate 5 slidably connected to the third mounting post 3 and a second blocking plate 6 slidably disposed on the upper side of the first blocking plate 5, wherein an elastic component is disposed between the first blocking plate 5 and the second blocking plate 6.

[0035] As can be seen from the description of this embodiment, in the specific working process, the rock-blocking operation is jointly completed by the first rock-blocking plate 5 and the second rock-blocking plate 6. That is, the first rock-blocking plate 5 and the second rock-blocking plate 6 are combined to form a rock-blocking wall. Moreover, the second rock-blocking plate 6, which can be freely raised and lowered, can be installed on the entire surface with the help of the elastic component. Furthermore, the elastic force provided by the elastic component can improve the stability of the rock-blocking wall and allow it to be locked onto the upper and lower parts of the goaf.

[0036] It is worth noting that, in order to ensure the stability of the sliding rock retaining components, a positioning rock retaining component is also provided. The positioning rock retaining component is set up based on the third mounting column 3, and has high stability. The subsequent sliding rock retaining components are installed sequentially based on the positioning rock retaining components, which can ensure the stability of the entire rock retaining wall.

[0037] In a preferred embodiment of the present invention, the elastic component includes a positioning block 26 disposed on one side of the second rock-blocking plate 6 and fixedly connected to the first rock-blocking plate 5, and a first limiting rod 8 fixedly connected to the bottom of the second rock-blocking plate 6. The first limiting rod 8 passes through the positioning block 26 and is slidably connected to it. The positioning block 26 is provided with a first limiting pin 10, and the first limiting rod 8 is provided with a first pin hole 9 that cooperates with the first limiting pin 10. An elastic element 7 is disposed between the second rock-blocking plate 6 and the positioning block 26.

[0038] In another preferred embodiment of the present invention, the sliding rock-blocking assembly includes a first rock-blocking plate 5, a second rock-blocking plate 6, and an elastic component. The bottom of the first limiting rod 8 is rotatably connected to a second limiting rod 25. The second limiting rod 25 is threadedly connected to a slider 22 that matches the groove of the guide belt 15. The first rock-blocking plate 5 is provided with a mounting hole 21 corresponding to the slider 22.

[0039] It is understood that in this application, the guide belt 15 serves only as a guide and a support in the sliding retaining wall assembly, thereby reducing the difficulty of handling the sliding retaining wall assembly. It does not provide support for the installed retaining wall. Therefore, a hinged structure similar to a track is adopted. Although it is not as stable as a metal plate in structure, it is convenient for winding and storage and reduces the space occupied.

[0040] In another preferred embodiment of the present invention, a first rotating wheel 23 is provided between the guide belt 15 and the first mounting post 1, the first rotating wheel 23 is rotatably connected to the first mounting post 1, one end of the guide belt 15 is fixedly connected to the first rotating wheel 23, and excess guide belt 15 is wound around the first rotating wheel 23; a second rotating wheel 24 is provided on the second mounting post 2 and is rotatably connected thereto.

[0041] In another preferred embodiment of the present invention, the first rock-blocking plate 5 is fixedly connected to a mounting plate 16 and a sliding pin 17 on the side near the traction assembly, and the sliding rock-blocking assembly further includes a lifting assembly. The lifting assembly includes a pin groove 18 disposed on the first rock-blocking plate 5 and matching the sliding pin 17, and a first limiting plate 27 slidably disposed on the first rock-blocking plate 5. A baffle 19 fixedly connected to the first rock-blocking plate 5 is disposed on one side of the first limiting plate 27, and a threaded rod 20 is rotatably connected to the baffle 19. The threaded rod 20 passes through the first limiting plate 27 and is threadedly connected to it.

[0042] It is worth noting that, due to the adjustment of the second rotating wheel 24, there is a certain horizontal gap between the guide belt 15 and the positioning block assembly, thereby preventing the positioning block assembly from hindering the movement of the sliding block assembly. When the sliding block assembly moves to the designated position, the vertical movement of the sliding block assembly is restricted by the first limiting plate 27, the sliding pin 17 and the pin groove 18, etc., so as to facilitate the adjustment of the position of the sliding block assembly and make it flush with the adjacent sliding block assembly.

[0043] In another preferred embodiment of the present invention, the traction assembly includes a connector 12 for connection with a traction machine, a lifting rod 13 is fixedly disposed on the connector 12, a pulley 14 is slidably connected to the lifting rod 13, and one end of the guide belt 15 is fixedly connected to the pulley 14.

[0044] The traction assembly requires an external traction machine as its power source, as it does not have its own power source. The pulley 14, lifting rod 13, and other components are provided to prevent the traction machine from changing height when climbing (or in other similar situations), which would cause uneven heights on both sides of the guide belt 15. By adjusting the position of the pulley 14, the guide belt 15 is guaranteed not to be damaged, and the stability of the sliding rock block assembly during transportation is also guaranteed.

[0045] In another preferred embodiment of the present invention, a second limiting plate 11 is fixedly connected to the first baffle plate 5.

[0046] A method for using a rock-blocking device for underground gob-side roadway retention in coal mines includes the following steps:

[0047] S1: Fix the first installation column 1, the second installation column 2 and the third installation column 3 in sequence within the goaf, with the upper and lower surfaces of the installation columns abutting against the upper and lower parts of the goaf, respectively;

[0048] S2: Install the positioning and blocking component onto one side of the third mounting column 3, and slide the first blocking plate 5 on the positioning and blocking component so that its bottom contacts the lower part of the goaf, and contacts the first limiting pin 10 to lock the first limiting rod 8. The second blocking plate 6 rises under the action of the elastic element 7 and abuts against the upper part of the goaf.

[0049] S3: Pull the guide belt 15 out from the wound state, pass it through the second wheel 24 on the second mounting column 2, and then fix the connector 12 to the traction machine;

[0050] S4: Slide the sliding block assembly off the fixed block 4, rotate the second limiting rod 25 so that the guide belt 15 is located between the second limiting rod 25 and the first block plate 5, install the slider 22, and push the sliding block assembly to slide on the guide belt 15;

[0051] S5: Move the sliding block assembly to one side of the positioning block assembly, loosen part of the slider 22, align the pin groove 18 in the moving sliding block assembly with the sliding pin 17 on the positioning block assembly, determine the approximate position of the sliding pin 17, and adjust the first limiting plate 27 so that it is directly above the sliding pin 17.

[0052] S6: Insert the sliding pin 17 into the pin groove 18 and completely release the slider 22. Move the sliding block assembly away from the guide belt 15 and push the first block plate 5 to move inward until it is flush with the adjacent first block plate 5. Rotate the second limiting rod 25 into the slot of the second limiting plate 11 to ensure that it is flush with the adjacent first block plate 5.

[0053] S7: Rotate the threaded rod 20 to adjust the position of the first limiting plate 27 to rise, so that the position of the first blocking plate 5 drops under the action of gravity until its bottom contacts the lower part of the goaf and contacts the first limiting pin 10 to lock the first limiting rod 8. The position of the second blocking plate 6 rises under the action of the elastic element 7 and abuts against the upper part of the goaf.

[0054] S8: Repeat steps S4-S7 until all sliding retaining wall components are installed.

[0055] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A coal mine underground gob-side entry retaining device, characterized in that, The utility model provides a kind of coal caving area blocking device, including first mounting column (1), second mounting column (2) and third mounting column (3) that are sequentially fixed in coal caving area;The side of third mounting column (3) is slidably provided with positioning gangue blocking assembly;The upper and lower sides of third mounting column (3) are also symmetrically provided with fixed block (4) fixedly connected with it, and a plurality of sliding gangue blocking assemblies are arranged between two fixed blocks (4);It further includes guide belt (15), the guide belt (15) is hinged by a plurality of metal sheets, and the middle position of the guide belt (15) is provided with sliding groove, one end of the guide belt (15) is rotatably connected with first mounting column (1), and the other end of the guide belt (15) is provided with traction assembly; The positioning gangue blocking assembly includes first gangue blocking plate (5) slidably connected with third mounting column (3) and second gangue blocking plate (6) slidably arranged on the upper side of first gangue blocking plate (5), and the first gangue blocking plate (5) is provided with elastic assembly between the second gangue blocking plate (6). The side of first gangue blocking plate (5) close to traction assembly is fixedly connected with mounting plate (16) and sliding bolt (17), and the sliding gangue blocking assembly further includes lifting assembly, the lifting assembly includes bolt sliding slot (18) arranged on first gangue blocking plate (5) and matched with sliding bolt (17), and first limiting plate (27) slidably arranged on first gangue blocking plate (5), the side of first limiting plate (27) is provided with baffle (19) fixedly connected with first gangue blocking plate (5), the baffle (19) is rotatably connected with threaded rod (20), and the threaded rod (20) penetrates first limiting plate (27) and is threadedly connected with it.

2. The coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 1, characterized in that, The elastic assembly includes positioning block (26) arranged on the side of second gangue blocking plate (6) and fixedly connected with first gangue blocking plate (5) and first limiting rod (8) fixedly connected at the bottom of second gangue blocking plate (6), the first limiting rod (8) penetrates positioning block (26) and is slidably connected with it, the positioning block (26) is provided with first limiting pin (10), the first limiting rod (8) is provided with first pin hole (9) matched with the first limiting pin (10), and the second gangue blocking plate (6) is provided with elastic element (7) between the positioning block (26).

3. The coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 2, characterized in that, The sliding gangue blocking assembly includes first gangue blocking plate (5), second gangue blocking plate (6) and elastic assembly, and the bottom of the first limiting rod (8) is rotatably connected with second limiting rod (25), the second limiting rod (25) is threadedly connected with sliding block (22) matched with sliding groove of guide belt (15), and the first gangue blocking plate (5) is provided with mounting hole (21) corresponding with sliding block (22).

4. The coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 3, characterized in that, The traction assembly includes connecting piece (12) for connecting with traction machinery, the lifting rod (13) is fixedly arranged on the connecting piece (12), the lifting rod (13) is slidably connected with pulley (14), and one end of the guide belt (15) is fixedly connected on the pulley (14).

5. The coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 4, characterized in that, The first rotating wheel (23) is rotationally connected with the first mounting column (1), one end of the guide belt (15) is fixedly connected with the first rotating wheel (23), and the excess guide belt (15) is wound on the first rotating wheel (23).

6. The coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 5, characterized in that, The first gangue blocking plate (5) is fixedly connected with the second limiting plate (11).

7. The method of using the coal gangue blocking device for gob-side entry retaining in a coal mine according to claim 6, characterized in that, The method comprises the following steps: S1: sequentially fixing the first mounting column (1), the second mounting column (2) and the third mounting column (3) in the goaf, and abutting the upper and lower surfaces of the mounting columns against the upper and lower parts of the goaf; S2: installing the positioning gangue blocking assembly to one side of the third mounting column (3), sliding the first gangue blocking plate (5) on the positioning gangue blocking assembly to make the bottom of the first gangue blocking plate (5) contact the lower part of the goaf, unlocking the first limiting pin (10) from the first limiting rod (8), and making the second gangue blocking plate (6) rise in position under the action of the elastic member (7) and abut against the upper part of the goaf; S3: pulling out part of the guide belt (15) from the winding state, fixing the connecting piece (12) to the traction machinery through the second rotating wheel (24) on the second mounting column (2); S4: sliding the sliding gangue blocking assembly from the fixed block (4), rotating the second limiting rod (25), making the guide belt (15) be located between the second limiting rod (25) and the first gangue blocking plate (5), installing the sliding block (22), and pushing the sliding gangue blocking assembly to slide on the guide belt (15); S5: moving the sliding gangue blocking assembly to one side of the positioning gangue blocking assembly, loosening part of the sliding block (22), aligning the sliding bolt slot (18) in the moving sliding gangue blocking assembly with the sliding bolt (17) on the positioning gangue blocking assembly, judging the approximate position of the sliding bolt (17), adjusting the first limiting plate (27) to make it be located directly above the sliding bolt (17); S6: inserting the sliding bolt (17) into the sliding bolt slot (18), completely loosening the sliding block (22), moving the sliding gangue blocking assembly away from the guide belt (15), pushing the first gangue blocking plate (5) to move inward until it is flush with the adjacent first gangue blocking plate (5), rotating the second limiting rod (25) into the clamping groove of the second limiting plate (11) to ensure that it is flush with the adjacent first gangue blocking plate (5); S7: rotating the threaded rod (20), adjusting the position of the first limiting plate (27) to rise, making the first gangue blocking plate (5) lower in position under the action of gravity until the bottom of the first gangue blocking plate (5) contacts the lower part of the goaf to unlock the first limiting pin (10) from the first limiting rod (8), and making the second gangue blocking plate (6) rise in position under the action of the elastic member (7) and abut against the upper part of the goaf; S8: repeating steps S4-S7 until the installation of all the sliding gangue blocking assemblies is completed.

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