Coal mine underground recycling large-diameter pressure relief hole sealing device and using method

Abstract

The invention discloses a large-diameter pressure relief hole sealing device for cyclic utilization in an underground coal mine and a using method. The device is composed of a threaded shaft rod, a hole sealing wood plate, a wood support bottom, a flexible steel bar and a wear-resistant soft rubber sheet, when the hole sealing wood plate is pushed along the threaded shaft rod, the flexible steel bar is bent and expanded to drive the soft rubber sheet to radially support tightly and extrude and seal with a hole wall, and quick and compact plugging is achieved in cooperation with anti-loosening locking. The scheme is simple in structure, convenient to operate and reusable, labor intensity and material consumption are reduced, plugging quality is improved, and coal seam spontaneous combustion risks are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine rock burst prevention and control, in particular to a coal mine underground recycling large-diameter pressure relief hole sealing device and a use method thereof. BACKGROUND

[0002] Coal mine rock burst prevention and control is an important field of current coal mine production and scientific research. In the process of rock burst prevention and control, large-diameter drilling pressure relief is an effective measure for prevention and control, and the general drilling diameter is 10 cm. When large-diameter drilling is arranged in the roadway coal wall, the coal seam in the hole is in full contact with oxygen, which is easy to induce coal seam spontaneous combustion and other disasters. Therefore, it is necessary to seal the pressure relief hole. In the prior art, yellow mud is mixed with water to form a paste, which is then inserted into the hole for sealing. However, the yellow mud is prone to collapse during solidification or cracking after solidification, resulting in a large gap between the yellow mud and the drilling hole, which is difficult to completely seal, and the operation is troublesome, time-consuming and labor-intensive.

[0003] Therefore, according to the actual construction situation, the present application designs a sealing device and a use method thereof with simple structure and convenient use, which makes the sealing process of the pressure relief hole more convenient and efficient, greatly reduces the labor intensity of workers, and improves the work efficiency. The sealing device can be recycled, saving resources. At the same time, the sealing quality is guaranteed, the possibility of coal seam spontaneous combustion is reduced, and the safety during construction is ensured, which has great significance for guiding safety production in subsequent coal mine production design. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a coal mine underground recycling large-diameter pressure relief hole sealing device, which comprises a threaded shaft, a sealing wood plate, a wooden base, and a plurality of flexible steel strips and wear-resistant soft rubber skins arranged between the wooden base and the sealing wood plate, characterized in that: One end of the threaded shaft is anchored to the wooden base, and the other end passes through the sealing wood plate to guide the sealing wood plate to move axially along the threaded shaft; The flexible steel strips are hinged to the wooden base and the sealing wood plate at both ends and are covered with wear-resistant soft rubber skins, so that when the sealing wood plate is axially compressed, the flexible steel strips are bent and expanded, driving the wear-resistant soft rubber skins to be radially tightened and pressed against the wall of the pressure relief hole for sealing; A locking fastener is arranged on the threaded shaft to lock the sealing wood plate at a predetermined position.

[0005] Further, in order to better realize the present application, the wear-resistant soft rubber skins are fixedly arranged between the outer contour of the wooden base and the inner hole contour of the sealing wood plate, forming a continuous annular sealing ring.

[0006] Further, in order to better realize the present application, the threaded segment of the threaded shaft is provided with a pin hole in the axial direction, and the anti-loose pin can be selectively inserted into the pin hole and cooperated with the lock washer to limit the position of the sealing board.

[0007] Further, in order to better realize the present application, the flexible steel strip is uniformly distributed in multiple groups, and each group contains three flexible steel strips.

[0008] Further, in order to better realize the present application, the sealing board is provided with a string for hanging the anti-loose pin at the edge of the sealing board.

[0009] A use method of the coal mine underground recycling large-diameter pressure relief hole sealing device, based on the above-mentioned coal mine underground recycling large-diameter pressure relief hole sealing device, characterized in that it comprises the following steps: S1, assembly, the sealing board is sleeved on the threaded shaft, and the lock washer is screwed to a predetermined position, and the anti-loose pin is hung on the sealing board through the string; S2, the device is inserted into the pressure relief hole to a target depth, the sealing board is pushed to move along the threaded shaft to the direction of the wooden base, the flexible steel strip is bent and expanded, and the wear-resistant soft rubber is attached to the hole wall; S3, the lock washer is tightened, and the anti-loose pin is inserted into the pin hole for locking, so as to realize sealing and plugging; S4, when disassembling, the anti-loose pin is pulled out and the lock washer is loosened, and the device is withdrawn for recycling.

[0010] Further, in order to better realize the present application, the length of the threaded segment of the threaded shaft is 60 cm, the pin hole is provided every 0.5 cm along the threaded segment, and the diameter of the anti-loose pin is 0.5 cm.

[0011] The present application has the following advantages: The present application makes the sealing of the pressure relief hole on the coal wall of the mine more compact, safe, convenient, efficient, greatly reduces the labor intensity of workers, improves the work efficiency, the device can be recycled, saves resources, ensures the sealing and fireproof quality, improves the sealing and fireproof effect, and also ensures the safety during construction, which has great significance for guiding safety production in subsequent coal mine production design. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a front view schematic diagram of the sealing device of the present application; Figure 2 It is a side view schematic diagram of the sealing device of the present application; Figure 3 It is a use state schematic diagram of the sealing device of the present application.

[0013] In the drawings, 1, threaded shaft; 2, anti-loose bolt; 3, string; 4, anti-loose nut; 5, sealing wood plate; 6, bolt hole; 7, flexible steel strip; 8, wear-resistant soft rubber; 9, wooden base. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0016] Figures 1-3 For a specific embodiment of the present application, as shown in Figure 1 Figure 2 The sealing device includes a threaded shaft 1, an anti-loose bolt 2, a string 3, an anti-loose nut 4, a sealing wood plate 5, a bolt hole 6, a flexible steel strip 7, a wear-resistant soft rubber 8, and a wooden base 9. The threaded shaft 1 is a light steel rod, one end of which is anchored in the center of the wooden base 9, and the other end passes through the center hole of the sealing wood plate 5, and is used for axial guidance of the sealing wood plate 5. The center hole of the sealing wood plate 5 is slightly larger than the diameter of the threaded shaft 1, so that it can smoothly slide along the axial direction; the outer edge of the sealing wood plate 5 is provided with a hanging position of the string 3, which is used to hang the anti-loose bolt 2, so as to avoid loss during downhole operation. The flexible steel strip 7 is evenly distributed around the connection between the threaded shaft 1 and the wooden base 9 in a hinged manner, and is hinged at the other end to the corresponding position of the sealing wood plate 5, and the flexible steel strip 7 is entirely covered by the wear-resistant soft rubber 8. The wear-resistant soft rubber 8 is fixedly arranged between the outer contour of the wooden base 9 and the inner hole contour of the sealing wood plate 5, forming a continuous annular elastic sealing layer. A plurality of bolt holes 6 are arranged on the threaded section of the threaded shaft 1 along the axial direction, which cooperate with the anti-loose bolt 2 to lock the position of the sealing wood plate 5 in combination with the anti-loose nut 4.

[0017] The threaded shaft 1 has a diameter of about 3 cm and a total length of about 100 cm; the right end of about 10 cm is a handle section, the left side of about 60 cm of the handle is a threaded section, and the threaded section is provided with a bolt hole 6 with a diameter of about 0.7 cm every 0.5 cm; the anti-loose bolt 2 has a diameter of about 0.5 cm. The wooden base 9 has a diameter of about 5 cm and a thickness of about 1 cm; the sealing wood plate 5 has a diameter of about 20 cm and a thickness of about 1 cm. The flexible steel strip 7 is made of multiple groups of annularly distributed three steel strips.

[0018] Referring to Figure 3, the sealing operation is performed according to the following steps: S1 Assembly: Before the device is in place, the threaded shaft 1, the sealing wood plate 5, the flexible steel strip 7, the wear-resistant soft rubber 8 and the wooden base 9 are pre-assembled into one body. On site, only need to rotate the lock nut 4 to the appropriate position of the threaded section, and hang the lock pin 2 with the fine rope 3 on the edge of the sealing wood plate 5 to prevent loss.

[0019] S2 Insertion and advancement: The device is sent along the pressure relief hole axis to the target depth, and the sealing wood plate 5 is pushed to move along the threaded shaft 1 to the direction of the wooden base 9. With the axial displacement of the sealing wood plate 5, the flexible steel strip 7 is bent and expanded under pressure, driving the wear-resistant soft rubber 8 to expand radially, and forming a circumferential extrusion fit with the hole wall.

[0020] S3 Locking and sealing: Tighten the lock nut 4 and insert the lock pin 2 into the corresponding pin hole 6 to lock the axial position of the sealing wood plate 5, form a dense plugging, and block the airflow and oxygen from entering the hole.

[0021] S4 Disassembly and recycling: When the work is completed and the plugging needs to be removed, pull out the lock pin 2 and loosen the lock nut 4, and the sealing wood plate 5 will retreat, and the device will exit and be recycled for reuse.

[0022] It should be noted that the advancement and locking should be carried out steadily to avoid partial bias caused by too fast; After locking, the continuous fit of the wear-resistant soft rubber 8 and the hole wall should be reviewed. The hinge of the flexible steel strip 7 and the outer surface of the wear-resistant soft rubber 8 should be kept clean, and the wear and aging should be checked regularly, and the corresponding parts should be replaced if necessary. The cooperation between the lock pin 2 and the pin hole 6 should be kept clean to ensure smooth and reliable positioning.

[0023] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it, and other modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art should be covered within the scope of the claims of the present application.

Claims

1. A sealing device for large-diameter pressure relief holes in underground coal mines, comprising a threaded shaft (1), a sealing wooden board (5), a wooden base (9), and several flexible steel strips (7) and wear-resistant soft rubber sheets (8) disposed between the wooden base (9) and the sealing wooden board (5), characterized in that: One end of the threaded shaft (1) is anchored to the wooden base (9), and the other end passes through the sealing wooden board (5) to guide the sealing wooden board (5) to move axially along the threaded shaft (1); The flexible steel strip (7) is hinged to the wooden base (9) and the sealing board (5) at both ends and covered by wear-resistant soft rubber (8), so that when the sealing board (5) is axially pressed, the flexible steel strip (7) bends and expands, driving the wear-resistant soft rubber (8) to radially tighten and squeeze and seal the pressure relief hole wall. The threaded shaft (1) is provided with anti-loosening fasteners for locking the sealing wooden board (5) in a predetermined position.

2. The sealing device for large-diameter pressure relief holes in underground coal mines according to claim 1, characterized in that: The wear-resistant soft rubber sheet (8) is fixedly set between the outer contour of the wooden base (9) and the inner contour of the sealing wooden board (5) to form a continuous annular sealing ring.

3. The sealing device for large-diameter pressure relief holes in underground coal mines according to claim 1, characterized in that: The threaded section of the threaded shaft (1) is provided with pin holes (6) spaced along the axial direction. The anti-loosening pin (2) can be selectively inserted into the pin hole (6) and cooperate with the anti-loosening nut (4) to limit the sealing board (5).

4. The sealing device for large-diameter pressure relief holes in underground coal mines according to claim 1, characterized in that: The flexible steel strips (7) are distributed in multiple groups in a circumferential manner, with each group containing three strips.

5. The sealing device for large-diameter pressure relief holes in underground coal mines according to claim 1, characterized in that: A thin rope (3) for attaching the anti-loosening pin (2) is provided at the edge of the sealed wooden board (5).

6. A method of using a sealing device for a large-diameter pressure relief hole in a coal mine for recycling, based on the sealing device for a large-diameter pressure relief hole in a coal mine for recycling as described in any one of claims 1-5, characterized in that... Includes the following steps: S1, Assembly: The sealing board (5) is fitted onto the threaded shaft (1) and the anti-loosening nut (4) is screwed to the predetermined position. The anti-loosening pin (2) is tied to the sealing board (5) by the thin rope (3). S2, insert the device into the pressure relief hole to the target depth, push the sealing wooden board (5) along the threaded shaft (1) towards the wooden support (9) to make the flexible steel strip (7) bend and expand and make the wear-resistant soft rubber (8) fit against the hole wall; S3, tighten the anti-loosening nut (4) and insert the anti-loosening pin (2) into the pin hole (6) to lock it in place and achieve a seal. S4, when disassembling, pull out the anti-loosening pin (2) and loosen the anti-loosening nut (4) to remove the device for reuse.

7. The method of using the sealing device for large-diameter pressure relief holes in underground coal mines according to claim 1, characterized in that: The threaded section of the threaded shaft (1) is 60cm long, and the pin hole (6) is provided every 0.5cm along the threaded section. The anti-loosening pin (2) has a diameter of 0.5cm.

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