Coal mine gas extraction drill hole sealing device

Abstract

The utility model relates to the technical field of gas extraction, in particular to a coal mine gas extraction hole drilling and sealing device which comprises a guide pipe, a mounting groove is vertically formed in the top end of the guide pipe, a piston rod is vertically inserted in the mounting groove in a sliding and sealing mode, and the bottom end of the piston rod is fixedly connected with the bottom of the mounting groove through multiple sets of telescopic components. An annular opening is formed in the surface of the guide pipe, a plurality of air outlets are formed in the opening wall of the annular opening, a plurality of air inlets are formed in the surface of the guide pipe, and the guide pipe is controlled by a driving assembly to rotate; a plurality of annular air bags are fixedly installed in the annular opening, and the multiple air outlets communicate with the multiple annular air bags correspondingly. The annular air bags are inflated to enable the annular air bags to expand until the outer bag walls of the annular air bags are tightly attached to the inner wall of the drill hole, the purpose of sealing the coal mine gas extraction drill hole can be achieved, and the hole sealing device is convenient, fast, low in cost and good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of gas extraction, in particular to a coal mine gas extraction drilling hole sealing device. Background Art

[0002] At present, gas extraction is a measure for coal mines to control gas disasters. When extracting gas from coal mines, in order to ensure a good gas extraction concentration, it is necessary to seal the extraction boreholes. The quality of the sealing directly affects the effect of gas extraction. The existing sealing of coal mine gas extraction boreholes mainly includes two methods: polyurethane sealing and cement mortar sealing.

[0003] When polyurethane is used for sealing holes, polyurethane tends to foam unevenly, resulting in an inadequate seal and air leakage. The sealing effect is poor, and the cost of polyurethane is high, which is not economical. When cement mortar is used for sealing holes, the cement mortar is hard and brittle after solidification. When it is impacted by ground pressure, cracks are often generated, causing air leakage in the borehole. The sealing effect is poor, which affects the effect of gas extraction. Utility Model Content

[0004] The purpose of the utility model is to solve the following shortcomings in the prior art: when polyurethane is used for sealing, polyurethane tends to foam unevenly, resulting in insufficient sealing, air leakage, and poor sealing effect, and the cost of polyurethane is high, which is not economical enough; and when cement mortar is used for sealing, the cement mortar is hard and brittle after solidification, and when it is impacted by ground pressure, cracks are often generated, causing air leakage in the borehole, poor sealing effect, and affecting the effect of gas extraction, thereby providing a coal mine gas extraction drilling hole sealing device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A coal mine gas extraction drilling hole sealing device, comprising a guide tube, the bottom end of the guide tube is conical, the top end of the guide tube is vertically provided with a mounting groove, a piston rod is vertically slidably and sealably inserted in the mounting groove, the bottom end of the piston rod is fixedly connected to the bottom of the mounting groove through multiple sets of telescopic components, an annular opening is provided on the surface of the guide tube, a plurality of air outlets connected to the mounting groove are provided on the wall of the annular opening, a plurality of air inlets connected to the mounting groove are provided on the surface of the guide tube, a one-way valve is provided in each of the air inlet and the air outlet, and the guide tube is controlled to rotate by a driving component;

[0007] A plurality of annular airbags are fixedly installed in the annular opening, and the plurality of air outlets are respectively connected with the plurality of annular airbags. A protective component is vertically slidably provided at the annular opening, and the protective component is used to protect the annular airbags.

[0008] Preferably, the driving assembly includes a driving motor, connecting rods are symmetrically fixedly installed on the surface of the top end of the guide tube, mounting plates are fixedly installed on the top ends of the two connecting rods, a U-shaped mounting frame is fixedly installed on the upper surface of the mounting plate, the driving motor is fixedly installed on the upper surface of the mounting frame, and the output shaft is fixedly connected to the mounting plate.

[0009] Preferably, the telescopic component comprises a first telescopic spring, and two ends of the first telescopic spring are fixedly connected to the bottom end of the piston rod and the bottom of the mounting groove respectively.

[0010] Preferably, a trapezoidal block is symmetrically fixedly installed on the surface of the top end of the piston rod, a rectangular plate is symmetrically fixedly installed on the upper surface of the guide tube, a through hole is opened on the surface of the rectangular plate, a rod is slidably inserted in the through hole, a triangular block is fixedly installed on the end of the rod close to the piston rod, the inclined surfaces of the two triangular blocks are respectively arranged face to face with the inclined surfaces of the two trapezoidal blocks, a second telescopic spring is sleeved on the rod, and the two ends of the second telescopic spring are respectively fixedly connected to the triangular block and the rectangular plate.

[0011] Preferably, the installation groove wall is symmetrically and vertically provided with limit openings, the piston rod surface is symmetrically and fixedly provided with limit rods, and the two limit rods are respectively and vertically slidably arranged in the two limit openings.

[0012] Preferably, the protective component includes a protective tube and a mounting rod fixedly installed at the bottom end of the protective tube, a sliding opening is vertically opened on the surface of the guide tube, the mounting rod is slidably configured in the sliding opening, the protective tube is slidably sleeved on the guide tube, a circular opening connected to the sliding opening is opened at the bottom of the mounting groove, a connecting rod is fixedly installed at the bottom end of the piston rod, the bottom end of the connecting rod passes through the circular opening and is fixedly connected to the top of the mounting rod.

[0013] Preferably, the bottom wall of the sliding opening is symmetrically and vertically provided with sealing grooves, the bottom of the mounting rod is symmetrically and vertically fixedly provided with sealing plates, and the two sealing plates are respectively slidably inserted into the two sealing grooves.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. By inflating multiple annular airbags to expand the annular airbags until the outer wall of the annular airbags fits tightly against the inner wall of the borehole, the purpose of sealing the coal mine gas extraction borehole can be achieved. This is convenient and fast, with low cost and good sealing effect.

[0016] 2. The design of the protective tube can protect the annular airbag when the device is inserted into the borehole, preventing the annular airbag from directly contacting the inner wall of the borehole during the process of entering the borehole, thereby causing damage. At the same time, the protective tube can also remove large particles of debris on the inner wall of the borehole, ensuring that the sealing surface of the borehole is flat and smooth, thereby ensuring the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front perspective structural diagram of a coal mine gas extraction drilling and sealing device proposed by the utility model;

[0018] Figure 2 This is a partial three-dimensional structural schematic diagram of a coal mine gas extraction drilling and sealing device proposed by the utility model;

[0019] Figure 3 It is a partial three-dimensional structural schematic diagram of a guide pipe in a coal mine gas extraction drilling and sealing device proposed by the utility model;

[0020] Figure 4 This is a partial cross-sectional structural diagram of a coal mine gas extraction drilling and sealing device proposed by the utility model;

[0021] Figure 5 It is a partial three-dimensional structural schematic diagram of a piston rod and a protective component in a coal mine gas extraction drilling and sealing device proposed by the utility model;

[0022] Figure 6 for Figure 1 A magnified view of the structure at center;

[0023] Figure 7 for Figure 2 A magnified view of the structure at B in the middle;

[0024] Figure 8 for Figure 5 Enlarged view of the structure at point C in the middle.

[0025] In the figure: 1 guide tube, 2 mounting groove, 3 piston rod, 4 annular opening, 5 air outlet, 6 air inlet, 7 annular airbag, 8 driving motor, 9 first telescopic spring, 10 trapezoidal block, 11 plug rod, 12 triangular block, 13 second telescopic spring, 14 limit opening, 15 limit rod, 16 protective tube, 17 mounting rod, 18 connecting rod, 19 sealing plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] The terms such as "upper", "lower", "left", "right", "middle" and "one" cited in the present utility model are only for the convenience of description and are not used to limit the scope of application of the present utility model. Changes or adjustments in their relative relationships shall be regarded as the scope of application of the present utility model without substantially changing the technical content.

[0028] Reference Figure 1-Figure 8 A coal mine gas extraction drilling and sealing device comprises a guide tube 1, the bottom end of the guide tube 1 is conical, a mounting groove 2 is vertically opened at the top of the guide tube 1, a piston rod 3 is vertically inserted in the mounting groove 2 for sliding sealing, the bottom end of the piston rod 3 is fixedly connected to the bottom of the mounting groove 2 through multiple sets of telescopic components, the telescopic components comprise a first telescopic spring 9, the two ends of the first telescopic spring 9 are respectively fixedly connected to the bottom end of the piston rod 3 and the bottom of the mounting groove 2, an annular opening 4 is opened on the surface of the guide tube 1, and a plurality of holes connected to the mounting groove 2 are opened on the wall of the annular opening 4. The guide tube 1 has a plurality of air inlets 6 connected to the mounting groove 2, and a one-way valve is arranged in the air inlet 6 and the air outlet 5. The guide tube 1 is controlled to rotate by a driving assembly. The groove wall of the mounting groove 2 is symmetrically and vertically provided with limit openings 14. The surface of the piston rod 3 is symmetrically fixed with limit rods 15. The two limit rods 15 are respectively vertically slidably arranged in the two limit openings 14. The piston rod 3 can only move vertically in the mounting groove 2 under the restriction of the limit rods 15 and the limit openings 14, and cannot rotate.

[0029] Multiple annular airbags 7 are fixedly installed in the annular opening 4, and multiple air outlets 5 are respectively connected to the multiple annular airbags 7. The conduction direction of the one-way valve in the air inlet 6 is from the outside to the installation groove 2, and the conduction direction of the one-way valve in the air outlet 5 is from the installation groove 2 to the annular airbag 7.

[0030] When it is necessary to seal the borehole, first insert the guide tube 1 into the borehole. After reaching the appropriate position, control the piston rod 3 to move downward, the volume of the space between the piston rod 3 and the mounting groove 2 will become smaller, and the pressure will increase. The gas in the mounting groove 2 will enter the multiple annular air bags 7 from the multiple air outlets 5. The annular air bags 7 will be inflated and expand until the outer wall of the annular air bags 7 fits tightly with the inner wall of the borehole. The purpose of sealing the coal mine gas extraction borehole can be achieved. It is convenient, fast, and low-cost, and the sealing effect is good.

[0031] The driving assembly includes a driving motor 8. Connecting rods are symmetrically fixedly installed on the surface of the top end of the guide tube 1. Mounting plates are fixedly installed on the top ends of the two connecting rods. A U-shaped mounting frame is fixedly installed on the upper surface of the mounting plate. The driving motor 8 is fixedly installed on the upper surface of the mounting frame, and the output shaft is fixedly connected to the mounting plate. When the driving motor 8 is started, the driving motor 8 will drive the guide tube 1 to rotate.

[0032] A trapezoidal block 10 is symmetrically fixedly installed on the surface of the top end of the piston rod 3, and a rectangular plate is symmetrically fixedly installed on the upper surface of the guide tube 1. A through hole is opened on the surface of the rectangular plate, and a plug rod 11 is slidably inserted in the through hole. A triangular block 12 is fixedly installed on the end of the plug rod 11 close to the piston rod 3, and the inclined surfaces of the two triangular blocks 12 are respectively arranged face to face with the inclined surfaces of the two trapezoidal blocks 10. A second telescopic spring 13 is sleeved on the plug rod 11, and the two ends of the second telescopic spring 13 are respectively fixedly connected to the triangular block 12 and the rectangular plate.

[0033] When the piston rod 3 moves downward, the multiple first telescopic springs 9 will shrink, and as the piston rod 3 moves downward, the inclined surfaces of the two trapezoidal blocks 10 will slide in contact with the inclined surfaces of the two triangular blocks 12 respectively. Under the action of the inclined surface pressure, the two triangular blocks 12 will move away from each other until the piston rod 3 moves downward to the point where the inclined surfaces of the two trapezoidal blocks 10 no longer slide in contact with the inclined surfaces of the two triangular blocks 12 respectively. The pressing force exerted by the trapezoidal block 10 on the triangular block 12 disappears, and the triangular block 12 will quickly move and reset under the elastic potential energy of the second telescopic spring 13, and be located above the trapezoidal block 10, thereby locking the piston rod 3. When it is necessary to unlock, it is only necessary to control the two insertion rods 11 to move away from each other so that the two triangular blocks 12 are no longer located above the two trapezoidal blocks 10 respectively.

[0034] A protective component is vertically slidably provided at the annular opening 4, and the protective component is used to protect the annular airbag 7. The protective component includes a protective tube 16 and a mounting rod 17 fixedly installed at the bottom end of the protective tube 16. A sliding opening is vertically opened on the surface of the guide tube 1, and the mounting rod 17 is slidably configured in the sliding opening. The protective tube 16 is slidably sleeved on the guide tube 1, and a circular opening connected to the sliding opening is opened at the bottom of the mounting groove 2. A connecting rod 18 is fixedly installed at the bottom end of the piston rod 3, and the bottom end of the connecting rod 18 passes through the circular opening and is fixedly connected to the top of the mounting rod 17. A sealing groove is symmetrically vertically opened on the bottom wall of the sliding opening, and a sealing plate 19 is symmetrically vertically fixedly installed on the bottom of the mounting rod 17. The two sealing plates 19 are respectively slidably inserted in the two sealing grooves. The sealing plate 19 can prevent impurities in the drilled hole from entering the sliding opening.

[0035] In the initial state, when the guide tube 1 is inserted into the borehole, the piston rod 3 will be located at the top, and the protective tube 16 will cover the multiple annular airbags 7, thereby protecting the annular airbags 7 and preventing the annular airbags 7 from directly contacting the inner wall of the borehole during the process of entering the borehole, thereby causing damage.

[0036] At the same time, during the rotation of the guide tube 1, the protective tube 16 can also remove large particles of debris from the inner wall of the borehole, ensuring that the sealing surface of the borehole is flat and smooth, thereby ensuring the sealing reliability.

[0037] When moved to a suitable position, the piston rod 3 moves downward with the protective tube 16, so that the shielding of the annular airbag 7 by the protective tube 16 gradually disappears, and the multiple annular airbags 7 are gradually exposed and abut against the sealing surface of the drilled hole.

[0038] In the utility model, when it is necessary to seal the borehole, firstly, the guide tube 1 is inserted into the borehole. After reaching the appropriate position, the piston rod 3 is controlled to move downward, the volume of the space between the piston rod 3 and the mounting groove 2 will become smaller, and the pressure will increase. The gas located in the mounting groove 2 will enter the multiple annular air bags 7 from the multiple air outlets 5. The annular air bags 7 are inflated and expand until the outer wall of the annular air bags 7 fits tightly with the inner wall of the borehole. The purpose of sealing the coal mine gas extraction borehole can be achieved. It is convenient, fast, and low in cost, and the sealing effect is good.

[0039] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coal mine gas extraction drilling hole sealing device, comprising a guide tube (1), characterized in that: The bottom end of the guide tube (1) is conical, a mounting groove (2) is vertically provided at the top end of the guide tube (1), a piston rod (3) is vertically slidably sealed and inserted in the mounting groove (2), the bottom end of the piston rod (3) is fixedly connected to the bottom of the mounting groove (2) through a plurality of sets of telescopic components, an annular opening (4) is provided on the surface of the guide tube (1), a plurality of air outlets (5) connected to the mounting groove (2) are provided on the wall of the annular opening (4), a plurality of air inlets (6) connected to the mounting groove (2) are provided on the surface of the guide tube (1), a one-way valve is provided in each of the air inlets (6) and the air outlets (5), and the guide tube (1) is controlled to rotate by a driving component; A plurality of annular airbags (7) are fixedly installed in the annular opening (4), the plurality of air outlets (5) are respectively connected to the plurality of annular airbags (7), and a protective component is vertically slidably provided at the annular opening (4), the protective component being used to protect the annular airbags (7).

2. A coal mine gas extraction drilling and sealing device according to claim 1, characterized in that: The driving assembly comprises a driving motor (8), connecting rods are symmetrically fixedly mounted on the surface of the top end of the guide tube (1), mounting plates are fixedly mounted on the top ends of the two connecting rods, a U-shaped mounting frame is fixedly mounted on the upper surface of the mounting plate, the driving motor (8) is fixedly mounted on the upper surface of the mounting frame, and the output shaft is fixedly connected to the mounting plate.

3. A coal mine gas extraction drilling and sealing device according to claim 1, characterized in that: The telescopic component comprises a first telescopic spring (9), the two ends of which are respectively fixedly connected to the bottom end of the piston rod (3) and the bottom of the installation groove (2).

4. A coal mine gas extraction drilling and sealing device according to claim 1, characterized in that: A trapezoidal block (10) is symmetrically fixedly mounted on the surface of the top end of the piston rod (3); a rectangular plate is symmetrically fixedly mounted on the upper surface of the guide tube (1); a through hole is opened on the surface of the rectangular plate, and a plug rod (11) is slidably inserted into the through hole; a triangular block (12) is fixedly mounted on the end of the plug rod (11) close to the piston rod (3); the inclined surfaces of the two triangular blocks (12) are respectively arranged face to face with the inclined surfaces of the two trapezoidal blocks (10); a second telescopic spring (13) is sleeved on the plug rod (11); and the two ends of the second telescopic spring (13) are respectively fixedly connected to the triangular block (12) and the rectangular plate.

5. A coal mine gas extraction drilling and sealing device according to claim 1, characterized in that: The groove wall of the installation groove (2) is symmetrically and vertically provided with a limiting opening (14); the surface of the piston rod (3) is symmetrically and fixedly provided with a limiting rod (15); and the two limiting rods (15) are respectively and vertically slidably arranged in the two limiting openings (14).

6. A coal mine gas extraction drilling and sealing device according to claim 1, characterized in that: The protective component comprises a protective tube (16) and a mounting rod (17) fixedly mounted on the bottom end of the protective tube (16); a sliding opening is vertically opened on the surface of the guide tube (1), the mounting rod (17) is slidably arranged in the sliding opening, the protective tube (16) is slidably sleeved on the guide tube (1), a circular opening connected to the sliding opening is opened at the bottom of the mounting groove (2), a connecting rod (18) is fixedly mounted on the bottom end of the piston rod (3), the bottom end of the connecting rod (18) passes through the circular opening and is fixedly connected to the top of the mounting rod (17).

7. A coal mine gas extraction drilling and sealing device according to claim 6, characterized in that: The bottom wall of the sliding opening is symmetrically and vertically provided with sealing grooves, and the bottom of the mounting rod (17) is symmetrically and vertically fixedly provided with sealing plates (19), and two sealing plates (19) are respectively slidably inserted in the two sealing grooves.

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