Coal mine gas extraction hole sealing device

Abstract

The invention discloses a hole sealing device for coal mine gas extraction. The hole sealing device structurally comprises a rubber pad, a threaded rod, a sleeve and a power structure. The power structure comprises a motor, a first gear, a second gear, a third gear, a first ratchet gear and a second ratchet gear; a rotating shaft is fixedly mounted below the first ratchet-gear wheel; a threaded rod is fixedly mounted below the second ratchet gear; when a motor rotates forwards, the motor controls a threaded rod to rotate, at the moment, a rotating shaft is static, and a rubber pad expands transversely under the extrusion action of a push plate and a supporting plate and is closed with a drill hole; when the motor rotates reversely, the motor controls the rotating shaft to rotate, at the moment, the threaded rod is static, and the rotating shaft can stir and knock the injected concrete; through the structure, two modes of a single-motor forward and reverse rotation control device are achieved, power is provided by the motor in the whole process, the working efficiency is improved, and the working intensity of a user is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam gas extraction, and in particular to a coal mine gas extraction sealing device. Background Art

[0002] Coal mine gas is a mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks. Gas is a harmful factor in coal mine production. It not only pollutes the air, but also causes explosions when it encounters fire when the gas content in the air is 5% to 16%, causing accidents. In the process of coal mining, coal mine gas is one of the main dangerous factors threatening coal mine safety. It is generally necessary to use pre-extraction gas methods to control coal seam gas in order to prevent gas accidents. For gas extraction, it is generally necessary to seal the hole between the hole mouth and the extraction pipe after drilling the gas extraction hole.

[0003] Sealing is an important technology in drilling for gas extraction in coal mines. The sealing of the borehole directly affects the extraction effect. In the process of sealing the hole, concrete is usually directly injected into the hole. However, the gas pressure in the gas cavity is relatively high. Before the concrete cools down, the gas in the coal mine cavity will rush out of the concrete, which will not only cause gas leakage, but also cause pores to appear after the concrete solidifies.

[0004] After searching, the Chinese patent application with application number "CN202321271858.2" discloses a coal mine gas extraction and sealing device, including a casing, the interior of which is connected with a threaded column, one end of which is fixedly connected with a connecting plate, the inner wall of which is fixedly connected with a protrusion, and the protrusion is embedded in the inside of an annular groove, and the annular groove is provided on the surface of a rubber pad. The utility model injects concrete into the injection head, and the concrete is transported to the conveying trough through the through groove, and then transported from the conveying trough to the gas hole and the cavity of the casing, and then pushes the push rod so that the push plate compacts the concrete, and then presses against the push rod and waits for the concrete to solidify. When the concrete solidifies, the device can fully block the gas hole, and then completely seal the gas extraction hole, and then effectively avoid gas leakage.

[0005] The above-mentioned coal mine gas extraction and sealing device can fully block the gas holes, and then completely seal the gas extraction holes, thereby effectively preventing gas leakage. However, it is found during use that the above-mentioned coal mine gas extraction and sealing device requires manual operation, which brings a great burden to the user and has low work efficiency. In addition, as the strength of the user is different, there are holes inside the concrete and the sealing state is different.

[0006] In summary, there is an urgent need for a coal mine gas extraction and sealing device to solve the above problems. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a coal mine gas extraction and sealing device to solve the problem that the existing coal mine gas extraction and sealing device requires manual operation, which brings a great burden to the user and has low work efficiency. In addition, as the strength of the user is different, there are holes in the concrete and the sealing state is different.

[0008] The present invention proposes a coal mine gas extraction and sealing device, comprising a rubber pad, a threaded rod, a casing and a power structure, the rubber pad and the casing are hollow inside, the casing is axially penetrated by a threaded rod, a threaded groove is arranged inside the casing, the threaded groove is threadedly engaged with the surface of a threaded column, and a threaded telescopic structure is formed between the threaded column and the casing via the threaded groove; a connecting plate is fixedly connected to one end of the threaded rod close to the rubber pad, a push plate is buckled on the bottom of the connecting plate, and a support plate is fixedly installed on one end of the rubber pad away from the push plate.

[0009] The coal mine gas extraction and sealing device also includes a support tube, which includes a top plate and a bottom plate; the threaded rod is rotatably installed under the top plate, and the sleeve is slidably installed in the center of the bottom plate.

[0010] A rotating shaft is rotatably mounted on the bottom plate, and the other end of the rotating shaft is movably mounted on the support plate; a protrusion and a connecting block are fixedly mounted on the outer wall of the rotating shaft, and the connecting block rotates along the axial direction of the rotating shaft under the control of the rotating shaft.

[0011] The power structure is fixedly installed above the top plate of the support cylinder to control the rotation of the threaded rod and the rotating shaft; the power structure includes a motor, a first gear, a second gear, a third gear, a first ratchet gear and a second ratchet gear; the motor is fixedly installed on the top plate, the output end of the motor is fixedly connected to the first connecting rod, the end of the first connecting rod away from the motor is fixedly connected to the first gear, the second gear and the third gear are rotatably installed on the lower surface of the top plate, the second gear and the third gear are arranged at both ends of the first gear, the second gear is concentrically arranged with the rotating shaft, and the third gear is concentrically arranged with the threaded rod; the first gear is meshed with the second gear and the third gear respectively.

[0012] A second connecting column is fixedly mounted on the lower surface of the second gear, and a second clamping block is rotatably mounted on the second connecting column; a first ratchet gear is rotatably mounted on the lower surface of the second gear, and the second clamping block meshes with the ratchet teeth of the first ratchet gear.

[0013] A first connecting column is fixedly mounted on the lower surface of the third gear, and a first clamping block is rotatably mounted on the first connecting column; a second ratchet gear is rotatably mounted on the lower surface of the third gear, and the first clamping block meshes with the ratchet teeth of the second ratchet gear.

[0014] A rotating shaft is fixedly installed below the first ratchet gear; and a threaded rod is fixedly installed below the second ratchet gear.

[0015] As a preferred solution of the coal mine gas extraction and sealing device described in the present invention, a pressure sensor is installed inside the connecting block to monitor the sealing status of the borehole for a long time.

[0016] As a preferred solution of the coal mine gas extraction and sealing device described in the present invention, the first clamping block is attached to the surface of the second ratchet gear, and the maximum rotation angle is when the motor is reversed; the second clamping block is attached to the surface of the first ratchet gear, and the maximum rotation angle is when the motor is forward rotating.

[0017] As a preferred solution of the coal mine gas extraction and sealing device described in the present invention, a conveying groove is arranged on the outer surface of the casing, a through groove is arranged axially of the casing, and the through groove is connected to the conveying groove through a grouting hole.

[0018] As a preferred solution of the coal mine gas extraction and sealing device described in the present invention, a second connecting rod is installed on the rotating shaft, and there are three rotating shafts. The three second connecting rods are provided with gear sets, and the gear sets are connected by belts.

[0019] As a preferred solution of the coal mine gas extraction and sealing device described in the present invention, a discharge groove is provided on one side of the support tube, and the discharge groove is used to discharge water or air in the borehole.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0021] 1. A coal mine gas extraction and sealing device shown in the present invention is a device in which the power structure is fixedly installed above the top plate of the support cylinder to control the rotation of the threaded rod and the rotating shaft; the motor is fixedly installed on the top plate, and the output end of the motor is fixedly connected to the first gear, and the second gear and the third gear are rotatably installed on the lower surface of the top plate; the first gear is respectively meshed with the second gear and the third gear; a second connecting column is fixedly installed on the lower surface of the second gear, and a second clamping block is rotatably installed on the second connecting column; a first ratchet gear is rotatably installed on the lower surface of the second gear, and the second clamping block is meshed with the ratchet teeth of the first ratchet gear; a first connecting column is fixedly installed on the lower surface of the third gear, and the first connecting column is A first clamping block is rotatably installed; a second ratchet gear is rotatably installed on the lower surface of the third gear, and the first clamping block is meshed with the ratchet teeth of the second ratchet gear; a rotating shaft is fixedly installed below the first ratchet gear; a threaded rod is fixedly installed below the second ratchet gear; when the motor rotates forward, the motor controls the threaded rod to rotate, and the rotating shaft is stationary at this time, and the rubber pad expands laterally and closes with the drill hole under the squeezing action of the push plate and the support plate; when the motor reverses, the motor controls the rotating shaft to rotate, and the threaded rod is stationary at this time, and the rotating shaft can stir and knock the injected concrete; the above structure realizes two modes of a single motor forward and reverse control device, and the overall process is powered by the motor, which improves work efficiency and reduces user work intensity.

[0022] 2. The present invention shows a coal mine gas extraction and sealing device, which is provided with a rotating shaft rotatably installed on the bottom plate, and the other end of the rotating shaft is movably installed on the support plate; a protrusion and a connecting block are fixedly installed on the outer wall of the rotating shaft, and the connecting block rotates along the axial direction of the rotating shaft under the control of the rotating shaft; when concrete is injected, the rotating shaft drives the connecting block and the protrusion to rotate, hammering and vibrating the concrete, reducing the air bubbles inside the concrete, effectively expelling the bubbles, and improving the strength of the concrete; at the same time, when the concrete solidifies, the protrusion and the connecting block on the rotating shaft can improve the concrete strength inside the drill hole, thereby completely sealing the gas extraction hole, and effectively avoiding gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a coal mine gas extraction and sealing device of the present invention;

[0024] Figure 2 It is a front view structural schematic diagram of a coal mine gas extraction and sealing device of the present invention;

[0025] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of ;

[0026] Figure 4 It is a schematic diagram of the top view of a coal mine gas extraction and sealing device of the present invention;

[0027] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure at AA;

[0028] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure at the upper BB.

[0029] In the figure: 1, rubber pad; 2, support plate; 3, sleeve; 4, rotating shaft; 5, conveying trough; 6, support cylinder; 7, motor; 8, first connecting rod; 9, top plate; 10, connecting block; 11, grouting hole; 12, push plate; 13, bump; 14, first gear; 15, second gear; 16, third gear; 17, first ratchet gear; 18, second ratchet gear; 19, second connecting rod; 20, threaded rod; 21, belt; 22, gear set; 23, connecting plate; 24, first clamping block; 25, second clamping block; 26, discharge trough; 27, bottom plate; 28, first connecting column; 29, second connecting column. DETAILED DESCRIPTION

[0030] First of all, it should be pointed out that in the different described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosure contained in the entire description can be transferred to the same parts with the same reference numerals or the same component names. Selected positional descriptions in the description, such as top, bottom, lateral, etc., also refer to the directly described and shown figures and are transferred to the new positions in the case of a change in position.

[0031] Embodiment 1:

[0032] A coal mine gas extraction sealing device, such as Figure 1-Figure 6 As shown, it includes a rubber pad 1, a threaded rod 20, a sleeve 3 and a power structure. The rubber pad 1 and the sleeve 3 are hollow inside. The sleeve 3 is axially penetrated by a threaded rod 20. The sleeve 3 is provided with a thread groove inside. The thread groove is threadedly engaged with the surface of the thread column. The thread column is a threaded telescopic structure between the thread groove and the sleeve 3.

[0033] like Figure 3 As shown, one end of the threaded rod 20 close to the rubber pad 1 is fixedly connected to a connecting plate 23 , a push plate 12 is buckled on the bottom of the connecting plate 23 , and one end of the rubber pad 1 away from the push plate 12 is fixedly mounted to a supporting plate 2 .

[0034] like Figure 3As shown, the coal mine gas extraction and sealing device also includes a support tube 6, and the support tube 6 includes a top plate 9 and a bottom plate 27; the threaded rod 20 is rotatably installed under the top plate 9, and the sleeve 3 is slidably installed in the center of the bottom plate 27.

[0035] like Figure 2 As shown, a rotating shaft 4 is rotatably mounted on the bottom plate 27, and the other end of the rotating shaft 4 is movably mounted on the supporting plate 2; a protrusion 13 and a connecting block 10 are fixedly mounted on the outer wall of the rotating shaft 4, and the connecting block 10 rotates along the axial direction of the rotating shaft 4 under the control of the rotating shaft 4. When concrete is injected, the rotating rotating shaft 4 drives the connecting block 10 and the protrusion 13 to rotate, and the concrete is hammered and vibrated to reduce the air inside the concrete, effectively discharge the bubbles, and improve the strength of the concrete. At the same time, when the concrete solidifies, the protrusion 13 and the connecting block 10 on the rotating shaft 4 can improve the concrete strength inside the borehole, thereby completely sealing the gas extraction hole, thereby effectively avoiding gas leakage. A pressure sensor is installed inside the connecting block 10 to monitor the sealing state of the borehole for a long time.

[0036] like Figure 3 As shown, the power structure is fixedly mounted above the top plate 9 of the support cylinder 6 to control the rotation of the threaded rod 20 and the rotating shaft 4;

[0037] The power structure includes a motor 7, a first gear 14, a second gear 15, a third gear 16, a first ratchet gear 17 and a second ratchet gear 18;

[0038] like Figure 4 As shown, the motor 7 is fixedly mounted on the top plate 9;

[0039] like Figure 3 As shown, the output end of the motor 7 is fixedly connected to a first connecting rod 8, and the end of the first connecting rod 8 away from the motor 7 is fixedly connected to a first gear 14; a second gear 15 and a third gear 16 are rotatably mounted on the lower surface of the top plate 9;

[0040] like Figure 5 As shown, the second gear 15 and the third gear 16 are arranged at both ends of the first gear 14, the second gear 15 is arranged concentrically with the rotating shaft 4, and the third gear 16 is arranged concentrically with the threaded rod 20; the first gear 14 is meshed with the second gear 15 and the third gear 16 respectively.

[0041] like Figure 3As shown, a second connecting column 29 is fixedly mounted on the lower surface of the second gear 15, and a second clamping block 25 is rotatably mounted on the second connecting column 29; a first ratchet gear 17 is rotatably mounted on the lower surface of the second gear 15, and the second clamping block 25 meshes with the ratchet teeth of the first ratchet gear 17.

[0042] like Figure 5 As shown, a first connecting column 28 is fixedly mounted on the lower surface of the third gear 16, and a first clamping block 24 is rotatably mounted on the first connecting column 28; a second ratchet gear 18 is rotatably mounted on the lower surface of the third gear 16, and the first clamping block 24 is meshed with the ratchet teeth of the second ratchet gear 18.

[0043] like Figure 3 As shown, a rotating shaft 4 is fixedly installed below the first ratchet gear 17 ; and a threaded rod 20 is fixedly installed below the second ratchet gear 18 .

[0044] When the motor 7 rotates forward, the second clamping block 25 slides on the surface of the first ratchet gear 17, and the first clamping block 24 engages on the surface of the second ratchet gear 18, and the motor 7 controls the threaded rod 20 to rotate. At this time, the rotating shaft 4 is stationary, and the rubber pad 1 expands laterally under the squeezing action of the push plate 12 and the support plate 2 and closes with the drill hole; when the motor 7 rotates reversely, the second clamping block 25 engages on the surface of the first ratchet gear 17, and the first clamping block 24 slides on the surface of the second ratchet gear 18, and the motor 7 controls the rotating shaft 4 to rotate, the threaded rod 20 is stationary, and the rotating shaft 4 can stir and knock the injected concrete; the above structure realizes two modes of the forward and reverse control device of a single motor 7, and the overall process is powered by the motor 7, which improves work efficiency and reduces the work intensity of users.

[0045] like Figure 2 As shown, the outer surface of the casing 3 is provided with a conveying groove 5, and the axial direction of the casing 3 is provided with a through groove, and the through groove is connected to the conveying groove 5 through a grouting hole 11.

[0046] like Figure 6 As shown, a second connecting rod 19 is installed on the rotating shaft 4 . The rotating shaft 4 is provided with three second connecting rods 19 . A gear set 22 is provided on the three second connecting rods 19 . The gear sets 22 are connected by belts 21 .

[0047] like Figure 6 As shown, a discharge groove 26 is provided on one side of the support tube 6, and the discharge groove 26 is used to discharge water or air in the borehole.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine gas extraction and sealing device, comprising a support tube (6), a rubber pad (1), a threaded rod (20), a sleeve (3) and a power structure, wherein the rubber pad (1) and the sleeve (3) are hollow inside, the sleeve (3) is axially penetrated by a threaded rod (20), a threaded groove is arranged inside the sleeve (3), the threaded groove is threadedly engaged with the surface of a threaded column, and a threaded telescopic structure is formed between the threaded column and the sleeve (3) through the threaded groove; the threaded rod (20) is fixedly connected to a connecting plate (23) at one end close to the rubber pad (1), a push plate (12) is buckled at the bottom of the connecting plate (23), and a support plate (2) is fixedly installed at one end of the rubber pad (1) away from the push plate (12); the support tube (6) comprises a top plate (9) and a bottom plate (27); the threaded rod (20) is rotatably installed below the top plate (9), and the sleeve (3) is slidably installed at the center of the bottom plate (27).

2. A coal mine gas extraction sealing device according to claim 1, characterized in that: A rotating shaft (4) is rotatably mounted on the bottom plate (27), and the other end of the rotating shaft (4) is movably mounted on the support plate (2).

3. A coal mine gas extraction sealing device according to claim 2, characterized in that: A protrusion (13) and a connection block (10) are fixedly mounted on the outer wall of the rotating shaft (4); the connection block (10) rotates along the axial direction of the rotating shaft (4) under the control of the rotating shaft (4).

4. A coal mine gas extraction sealing device according to claim 2, characterized in that: The power structure is fixedly mounted above the top plate (9) of the support tube (6); the power structure comprises a motor (7), a first gear (14), a second gear (15), a third gear (16), a first ratchet gear (17) and a second ratchet gear (18).

5. A coal mine gas extraction sealing device according to claim 4, characterized in that: The motor (7) is fixedly mounted on the top plate (9); the output end of the motor (7) is fixedly connected to a first connecting rod (8); an end of the first connecting rod (8) away from the motor (7) is fixedly connected to a first gear (14); a second gear (15) and a third gear (16) are rotatably mounted on the lower surface of the top plate (9); the second gear (15) and the third gear (16) are arranged at two ends of the first gear (14); and the first gear (14) is respectively meshed with the second gear (15) and the third gear (16).

6. A coal mine gas extraction sealing device according to claim 5, characterized in that: The second gear (15) is arranged concentrically with the rotating shaft (4); a second connecting column (29) is fixedly mounted on the lower surface of the second gear (15), and a second clamping block (25) is rotatably mounted on the second connecting column (29); a first ratchet gear (17) is rotatably mounted on the lower surface of the second gear (15), and the second clamping block (25) is meshed with the ratchet teeth of the first ratchet gear (17); and a rotating shaft (4) is fixedly mounted below the first ratchet gear (17).

7. A coal mine gas extraction and sealing device according to claim 6, characterized in that: The third gear (16) is concentrically arranged with the threaded rod (20); a first connecting column (28) is fixedly mounted on the lower surface of the third gear (16), and a first clamping block (24) is rotatably mounted on the first connecting column (28); a second ratchet gear (18) is rotatably mounted on the lower surface of the third gear (16), and the first clamping block (24) is meshed with the ratchet teeth of the second ratchet gear (18); and a threaded rod (20) is fixedly mounted below the second ratchet gear (18).

8. A coal mine gas extraction and sealing device according to claim 3, characterized in that: A pressure sensor is installed inside the connection block (10) to monitor the sealing state of the borehole over a long period of time.

9. A coal mine gas extraction and sealing device according to claim 1, characterized in that: The outer surface of the casing (3) is provided with a conveying groove (5), and the axial direction of the casing (3) is provided with a through groove, and the through groove is connected to the conveying groove (5) through a grouting hole (11).

10. A coal mine gas extraction and sealing device according to claim 2, characterized in that: A second connecting rod (19) is installed on the rotating shaft (4). The rotating shaft (4) is provided with three second connecting rods. The three second connecting rods (19) are provided with gear sets (22). The gear sets (22) are connected by belts (21).

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