Air film dust removal device for coal mine drilling

Abstract

The utility model relates to the field of coal mine drilling machines, and particularly discloses an air film dust removal device for coal mine drilling, which comprises a downstream bend, an outer cylinder, an adjusting head and an air film seat, the adjusting head, the outer cylinder and a main pipe of the downstream bend are coaxially connected, the outer cylinder is in threaded connection with the outer wall of the adjusting head, and the outer wall of the outer cylinder is communicated with an air inlet; an air film base capable of being elastically deformed is connected between the inner wall of the outer barrel and the outer wall of the adjusting head in a sleeved mode, the air inlet is used for being communicated with an external air source and guiding airflow into the position between the outer barrel and the adjusting head, the inner wall of the end of the air film base is in a wedge shape attached to the outer wall of the adjusting head, and the air film base is located on the butt joint face of the downstream bend main pipe and the adjusting head. According to the scheme, the problem that gas leaks from the drill rod end in an existing dust removal device can be solved.

Description

Technical Field

[0001] The utility model relates to the field of coal mine drilling rigs, in particular to an air film dust removal device for coal mine drilling. Background Art

[0002] Currently, coal mine drilling rigs are used in underground coal mines for coal seam gas extraction, directional high-level extraction, and floor water temperature detection and reinforcement. When drilling coal seam gas extraction holes, a large amount of dust is discharged into the hole, and the dust concentration is high, seriously affecting the working environment and the health of employees. To ensure the normal operation of the drilling operation, drill cuttings must be removed promptly. While various methods are currently available, most use pneumatic deslagging to remove drill cuttings. However, deep drilling in soft coal seams is difficult using other deslagging methods. However, during the process of pneumatic slag removal, the flying coal seam causes the dust to seriously exceed the standard, causing production safety hazards. In order to reduce the safety hazards of pneumatic slag removal, small gas outburst spray holes often occur during the drilling process, causing the gas in the tunnel airflow to exceed the limit. When the gas concentration reaches 4% to 16%, it will explode when encountering a fire source. Therefore, during the drilling process, a dust removal device to prevent gas outburst is used, such as a gas outburst prevention system proposed by our company. It sets an orifice sealer at the borehole mouth to discharge the gas through the exhaust vent, and uses a two-stage dust extinguisher to gradually reduce the gas pressure.

[0003] In actual application, it was found that since a rubber ring is used as a sealing plug between the drill rod and the hole, and the drill rod is constantly rotating, the rubber ring is extremely easy to wear. After wear, gas will leak from the gap. When the leakage volume reaches a certain value, the gas alarm device will be triggered. Therefore, there is an urgent need for a device to block gas at the end of the drill rod. Utility Model Content

[0004] The utility model provides an air film dust removal device for coal mine drilling, so as to solve the problem that gas leaks from the drill rod end in the existing dust removal device.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: a wind film dust removal device for coal mine drilling, comprising a water bend, an outer cylinder, an adjusting head, and a wind film seat, wherein the water bend comprises a main pipe and a branch pipe connected to the side of the main pipe, the adjusting head, the outer cylinder, and the water bend main pipe are coaxially connected, a drill rod passes through the adjusting head and the water bend main pipe, the outer cylinder is threadedly connected to the outer wall of the adjusting head, the outer wall of the outer cylinder is connected to an air inlet, and the two ends of the outer cylinder are respectively sealed and connected to the outer wall of the water bend main pipe and the outer wall of the adjusting head;

[0006] An elastically deformable wind membrane seat is sleeved between the inner wall of the outer cylinder and the outer wall of the regulating head. The air inlet is used to connect to the external air source and guide the airflow between the outer cylinder and the regulating head. The inner wall of the end of the wind membrane seat is wedge-shaped and fits the outer wall of the regulating head. The wind membrane seat is located at the docking surface of the water bend main pipe and the regulating head, and the wedge-shaped seal of the wind membrane seat connects the docking surface of the water bend main pipe and the regulating head.

[0007] The basic principle of this solution is: a wedge-shaped wind film seat is set at the air inlet. The wind film seat is made of soft rubber and has a certain elastic deformation ability. When air enters from the air inlet, a large amount of gas accumulates at the soft rubber layer to form air pressure, thereby compressing the soft rubber layer, and then forming a gap between the soft rubber layer and the regulating head. The airflow enters the docking surface between the water bend main pipe and the regulating head from the wedge surface. A drill rod passes through the water bend main pipe, and an annular hollow gap is formed between the outer wall of the drill rod and the inner wall of the water bend main pipe. The airflow thus forms a wind curtain in the hollow part to prevent gas in the drill rod from leaking from the rear when drilling in the coal mine.

[0008] The beneficial effects of this solution are as follows: since a rubber ring is used as a sealing plug between the drill rod and the hole, and the drill rod is constantly rotating, the rubber ring is extremely easy to wear, and gas will leak from the gap after wear. This solution provides an elastically deformable wind film seat at the interface between the water-bend section on the outside of the drill rod and the regulating head, and uses an outer tube to seal the external space of the regulating head, forming a passage for air flow inside the outer tube and the regulating head. After the wind film seat is compressed by air flow, the air flow enters the interface and blows toward the outer wall of the drill rod to form a wind film barrier, thereby blocking the gas flowing along the drill rod to the rear end of the drill rod, avoiding gas leakage from the end of the drill rod. At the same time, the air flow causes the drill cuttings generated during the drilling process to be discharged outward along the branch pipe of the water-bend, thereby blocking dust.

[0009] Furthermore, a flange is fixed to the outer wall of one end of the downstream bend main pipe near the outer cylinder, and a thread is drilled in the flange of the flange. A first threaded hole is drilled in the air film seat corresponding to the drilled hole of the flange. A pressing seat is abutted on the other side of the air film seat, and a through hole is drilled in the pressing seat corresponding to the first threaded hole. A screw is threadedly connected in the drilled hole of the flange and the first threaded hole. The end of the screw is interference-fitted in the through hole of the pressing seat, and the other end of the screw is threadedly connected to a hexagonal nut. The adjusting seat is fastened between the outer cylinder and the adjusting head by the pressing seat and the flange. At the same time, the air film seat and the flange cooperate to seal the end face of the outer cylinder.

[0010] Furthermore, the outer tube has an internal thread on its inner wall near the regulating head, and the regulating head has an external thread at a location corresponding to the internal thread. The outer tube can be threadedly connected to the regulating head. An O-ring is installed between the internal thread section of the outer tube and the air inlet. The O-ring is embedded in an annular groove formed on the outer wall of the regulating head. The outer tube is fixed by the external thread, and the other end of the outer tube is sealed with the O-ring.

[0011] Furthermore, the water bend is a reducing water tee structure, and the branch pipe of the water bend can be used as an air duct outlet or a slag removal port to discharge the drill cuttings generated during the drilling process. The branch pipe of the water tee smoothly transitions with the main pipe, allowing the drill cuttings to be discharged smoothly.

[0012] Furthermore, a connecting flange is coaxially fixed to one end of the water bend away from the regulating head. The connecting flange is utilized to fix the water bend to the equipment outside the borehole.

[0013] Furthermore, a second vertical threaded hole is formed on the outer wall of the outer cylinder, and a threaded blind hole is formed on the adjusting head corresponding to the second threaded hole. A hexagon socket head cap screw is connected between the second threaded hole and the threaded blind hole. This secures the outer cylinder to the adjusting head, thereby reducing relative slippage between the outer cylinder and the adjusting head and improving the sealing effect.

[0014] Furthermore, the minimum inner diameter of the wind film seat is the same as the inner diameter of the water bend main pipe on its left and right ends and the inner diameter of the adjustment head end face, ensuring that the wind film seat at the joint does not affect the normal drilling work of the drill pipe.

[0015] Furthermore, the end surface of the wind film seat near the water bend main pipe is a wedge surface, the maximum inner diameter of the wedge surface is smaller than the inner diameter of the water bend main pipe. The wedge surface at the other end of the wind film seat forms a triangular notch, allowing airflow to accumulate at the notch, widening the width of the air curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0018] Figure 3 Schematic diagram of the wind membrane seat in the embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The reference numerals in the drawings of the specification include: connecting flange 1, water bend 2, hexagonal nut 3, wind membrane seat 4, pressing seat 5, O-ring 6, outer cylinder 7, screw 8, adjusting head 9, flange 10, air inlet 11.

[0021] The embodiment is basically as shown in the attached Figure 1 To the attached Figure 3 As shown:

[0022] A wind film dust removal device for coal mine drilling includes an adjusting head 9, a water bend 2, and an outer cylinder 7. The water bend 2 is a three-way structure with different diameters. The water bend 2 includes a straight main pipe and a branch pipe connected to the main pipe. A connecting flange 1 is coaxially fixed on the end face near the connection between the main pipe and the branch pipe. An adjusting head 9 is coaxially arranged on the other end of the main pipe. The outside of the adjusting head 9 is in the shape of multiple steps, wherein the left end of the adjusting head 9 is in the shape of an inclined surface, and an external thread is arranged on the outer wall of the right end of the adjusting head 9. An internal thread is arranged on the inner wall of the right end of the outer cylinder 7, which can be threadedly connected to the external thread of the adjusting head 9, thereby fixing the outer cylinder 7 on the outer wall of the water bend 2 and the adjusting head 9. Two air inlets 11 are symmetrically arranged on the outer wall of the outer cylinder 7, and the direction of the air inlet 11 is perpendicular to the wall surface of the outer cylinder 7.

[0023] A flange 10 is provided between the inner wall of the left end of the outer cylinder 7 and the outer wall of the main pipe of the water bend 2. In this embodiment, the flange 10 is a bend welding flange 10, which is coaxially welded to the outer wall of the main pipe.

[0024] An annular wind film seat 4 is coaxially mounted beside the flange 10. The inner wall of the wind film seat 4 is wedge-shaped and fits the outer wall of the left inclined surface of the regulating head 9. The wind film seat 4 is made of a deformable soft rubber material. One side of the wind film seat 4 contacts the flange 10, and the other side contacts the pressing seat 5. The pressing seat 5 is in the shape of an annular plate. A first threaded hole is provided at the drilled hole of the flange 10 corresponding to the flange 10 of the wind film seat 4, and a through hole is provided at the drilled hole of the pressing seat 5 corresponding to the first threaded hole. In this embodiment, the number of the first threaded hole and the through hole are both 4. When the wind film seat 4 is clamped by the flange 10 and the pressing seat 5, a screw is threadedly connected to the drilled hole of the flange 10 and the first threaded hole, and is interference-fitted with the through hole of the pressing seat 5. A hexagonal nut 3 is installed at the other end of the screw to fix the wind film seat 4 on the inner wall of the outer cylinder 7. At the same time, the wind film seat 4 is located in the gap between the regulating head 9 and the main pipe of the water bend 2.

[0025] An annular groove is provided on the outer wall of the regulating head 9 near the air inlet 11 , and an O-ring 6 is installed in the annular groove, so that the contact surface between the outer cylinder 7 and the regulating head 9 is sealed by the O-ring 6 to prevent the air entering the air inlet 11 from leaking.

[0026] In order to further fix the outer tube 7, a second vertical threaded hole is opened on the outer wall of the outer tube 7, and a threaded blind hole is opened on the outer wall of the adjusting head 9 corresponding to the second threaded hole. The hexagon socket head screw 8 is passed through the second threaded hole and the threaded blind hole, so that the outer tube 7 is firmly connected to the connecting head.

[0027] like Figure 3As shown, in order to further enhance the wind film effect formed by the deformation of the wind film seat 4, the inner wall of the wind film seat 4 near the end of the main pipe of the water bend 2 is enlarged, thereby forming wedge surfaces at both ends of the inner wall of the wind film seat 4. This creates a triangular gap between the vertical end face of the water bend 2 and the wedge surface of the wind film seat 4, increasing the wind resistance at this location. As the airflow enters the inner wall of the regulating head 9 from the air inlet 11 and flows from right to left, it is blocked by the inclined surface and the vertical end face of the water bend 2 in the triangular gap, filling the triangular gap and achieving the effect of accumulating air and increasing the width of the wind curtain.

[0028] The specific implementation process is as follows:

[0029] By setting a wedge-shaped wind film seat 4 at the air inlet 11, the wind film seat 4 is made of soft rubber with a certain elastic deformation ability. When air enters from the air inlet 11, a large amount of gas accumulates in the soft rubber layer to form air pressure, thereby compressing the soft rubber layer, and then forming a gap between the soft rubber layer and the regulating head 9. The airflow enters the docking surface between the main pipe of the water bend 2 and the regulating head 9 from the wedge surface. A drill rod passes through the main pipe of the water bend 2, and an annular hollow gap is formed between the outer wall of the drill rod and the inner wall of the main pipe of the water bend 2. The airflow thus forms a wind curtain in the hollow part to prevent gas in the drill rod from leaking from the rear when drilling in the coal mine. Since the left end of the wind film seat 4 is enclosed outward, the flow rate is slowed down, and it is blocked by the end face of the main pipe of the water bend 2. The wind curtain is concentrated at the annular hollow gap to prevent gas from flowing along the annular hollow gap and leaking from the rear end of the drill rod during drilling.

[0030] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A wind film dust removal device for coal mine drilling, characterized by: It includes a water bend, an outer tube, a regulating head, and an air membrane seat. The water bend includes a main pipe and a branch pipe connected to the side of the main pipe. The regulating head, outer tube, and water bend main pipe are coaxially connected. A drill rod passes through the regulating head and the water bend main pipe. The outer tube is threadedly connected to the outer wall of the regulating head. The outer wall of the outer tube is connected to the air inlet. The two ends of the outer tube are respectively sealed and connected to the outer wall of the water bend main pipe and the outer wall of the regulating head. An elastically deformable wind membrane seat is sleeved between the inner wall of the outer cylinder and the outer wall of the regulating head. The air inlet is used to connect to the external air source and guide the airflow between the outer cylinder and the regulating head. The inner wall of the end of the wind membrane seat is wedge-shaped and fits the outer wall of the regulating head. The wind membrane seat is located at the docking surface of the water bend main pipe and the regulating head, and the wedge-shaped seal of the wind membrane seat connects the docking surface of the water bend main pipe and the regulating head.

2. The air film dust removal device for coal mine drilling according to claim 1, characterized in that: A flange is fixed on the outer wall of one end of the water-bend main pipe close to the outer cylinder, and a thread is opened in the flange drilling hole of the flange, and a first threaded hole is opened at the wind membrane seat corresponding to the flange drilling hole. A clamping seat is abutted on the other side of the wind membrane seat, and a through hole is opened at the clamping seat corresponding to the first threaded hole. A screw is threadedly connected in the flange drilling hole and the first threaded hole, and the end of the screw is interference fit in the through hole of the clamping seat, and the other end of the screw is threadedly connected to a hexagonal nut.

3. The air film dust removal device for coal mine drilling according to claim 2, characterized in that: The outer tube has an internal thread on the inner wall of one end close to the regulating head, and the regulating head has an external thread at the position corresponding to the internal thread. The outer tube can be threadedly connected to the regulating head, an O-ring is installed between the internal thread section on the outer tube and the air inlet, and an annular groove is provided on the outer wall of the regulating head, and the O-ring is embedded in the annular groove.

4. The air film dust removal device for coal mine drilling according to claim 3, characterized in that: The water-following bend is a water-following tee structure with a different diameter, and the branch pipe of the water-following bend can be used as an air duct outlet or a slag removal port to discharge the drill cuttings generated during the drilling process.

5. The air film dust removal device for coal mine drilling according to claim 4, characterized in that: A connecting flange is coaxially fixed on one end of the water-bend away from the regulating head.

6. The air film dust removal device for coal mine drilling according to claim 5, characterized in that: A vertical second threaded hole is provided on the outer wall of the outer cylinder, a threaded blind hole is provided on the adjusting head corresponding to the second threaded hole, and a hexagon socket head screw is connected between the second threaded hole and the threaded blind hole.

7. The air film dust removal device for coal mine drilling according to claim 6, characterized in that: The diameter at the minimum inner diameter of the wind membrane seat is the same as the inner diameter of the water bend main pipe at its left and right ends and the inner diameter of the end face of the regulating head.

8. The air film dust removal device for coal mine drilling according to claim 7, characterized in that: The end surface of the wind membrane seat close to one end of the water bend main pipe is a wedge surface, and the maximum inner diameter of the wedge surface is smaller than the inner diameter of the water bend main pipe.

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