Crushed coal discharging drill rod suitable for rotary air knife hole forming

Abstract

A crushed coal discharging drill rod suitable for rotary air knife hole making is characterized in that a rotary air knife connector is fixedly installed at the end of an air and water supply pipe, the air and water supply pipe is coaxially sleeved with an external sleeve, the external sleeve and the air and water supply pipe are connected through a connecting plate, and the air and water supply pipe is provided with an extending external sleeve of the rotary air knife connector; the air supply and water supply pipe and the external sleeve are provided with the crushing movable clamping plate, a common drill rod is replaced by the crushed coal collecting section and the crushed coal discharging section which are of an inner-outer double-layer structure, crushed coal can directly pass through an interlayer between the air supply and water supply pipe and the external sleeve under the action of airflow, and the purpose of rapidly discharging the crushed coal is achieved. Meanwhile, the crushed coal collecting section and the crushed coal discharging section can clamp strip-shaped protrusions arranged on the surface of the crushed coal discharging section in the axial direction through a drilling machine to conduct small-amplitude torsion, a movable crushing clamping plate and a fixed crushing clamping plate continuously cut large crushed coal into pieces, and the situation that the crushed coal is too large to be clamped in an interlayer is prevented. And the expected hole forming effect can be ensured.

Description

Technical Field

[0001] The utility model relates to a drill pipe, in particular to a coal crushing and discharging drill pipe suitable for rotary air knife cavity forming. Background Technique

[0002] In coal mine gas drainage, in order to ensure the drainage efficiency, it is necessary to form cavities in sequence on the drilling path to form holes in the coal seam, so that the coal body expands, deforms, relieves pressure and displaces, thereby greatly improving the gas permeability of the coal seam. The improvement of the gas permeability of the coal seam provides more channels for gas flow, making it easier to extract gas.

[0003] At present, when using a rotary air knife for gas drainage and cavity forming, crushed coal is mainly blown out of the drill hole by high-pressure air. However, the gap between the current drill pipe and the inner wall of the drill hole is small, and crushed coal is extremely easy to accumulate in the drill hole, affecting the discharge of crushed coal and further affecting the cavity forming effect. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the utility model provides a coal crushing and discharging drill pipe suitable for rotary air knife cavity forming, which can further crush coal blocks, enable the crushed coal to be smoothly discharged from the drill hole, and ensure that the cavity forming effect reaches the expected level.

[0005] To achieve the above object, a coal crushing and discharging drill pipe suitable for rotary air knife cavity forming of the utility model includes a coal crushing collection section, a rotary air knife joint, a gas supply and water supply pipe, a bearing sleeve, a fixed crushing splint, a crushing splint positioning hammer, a movable crushing splint, an outer casing, a connecting plate, a flushing water pipe and a coal crushing discharging section. The coal crushing collection section is screwed to the coal crushing discharging section. The coal crushing collection section further includes a rotary air knife joint, a gas supply and water supply pipe, a bearing sleeve, a fixed crushing splint, a crushing splint positioning hammer, a movable crushing splint, an outer casing and a connecting plate. The end of the gas supply and water supply pipe is fixedly installed with a rotary air knife joint. The outer casing is coaxially sleeved on the gas supply and water supply pipe. The outer casing and the gas supply and water supply pipe are connected by a connecting plate. The part of the gas supply and water supply pipe where the rotary air knife joint is installed extends out of the outer casing. A bearing sleeve is provided on the surface of the extended part of the gas supply and water supply pipe. The bearing sleeve is connected to the crushing splint positioning hammer through the fixed crushing splint. The gas supply and water supply pipe and the outer casing are equipped with a movable crushing splint, and the adjacent surfaces of the movable crushing splint and the fixed crushing splint are in contact; the pipeline inside the coal crushing discharging section is connected to the gas supply and water supply pipe through threads; strip-shaped protrusions are arranged axially on the surfaces of the coal crushing collection section and the coal crushing discharging section.

[0006] In addition, the coal crushing and discharging drill pipe suitable for rotary air knife cavity forming proposed in the above embodiment of the utility model may further have the following additional technical features:

[0007] As a further improvement scheme of the utility model, a flushing water pipe is provided between the outer casing and the gas supply and water supply pipe, and the nozzle of the flushing water pipe is arranged behind the movable crushing splint.

[0008] As a further improvement scheme of the utility model, a pipeline for supplying water to the flushing water pipe is arranged inside the coal crushing and discharging section.

[0009] As a further improvement scheme of the utility model, the outer casing and the rear end of the coal crushing and discharging section are shrunk.

[0010] As a further improvement scheme of the utility model, protrusions are arranged on the outer surface of the crushing splint positioning hammer.

[0011] By means of the above scheme, the utility model has at least the following advantages: compared with a conventional drill pipe, by replacing the ordinary drill pipe with a coal crushing collection section and a coal crushing and discharging section with an inner and outer double-layer structure, coal fragments can directly pass through the interlayer between the air supply and water supply pipe and the outer casing under the action of air flow, achieving the purpose of quickly discharging coal fragments. At the same time, the coal crushing collection section and the coal crushing and discharging section can be slightly twisted by the drill rig clamping the strip-shaped protrusions arranged axially on the surface of the coal crushing and discharging section, so that the crushing moving splint and the crushing fixed splint continuously cut large coal fragments, preventing the coal fragments from being too large and getting stuck in the interlayer, ensuring that the coal fragments can be smoothly discharged from the drill hole and ensuring that the cavity forming effect reaches the expected value. Description of the Drawings

[0012] Figure 1 is a perspective view of the utility model;

[0013] Figure 2 is a perspective view of the coal crushing collection section of the utility model;

[0014] Figure 3 is Figure 2 a partial enlarged view of part A of

[0015] Figure 4 is a partial sectional view of the coal crushing collection section of the utility model;

[0016] Figure 5 is a partial sectional view of the coal crushing collection section of the utility model with a flushing water pipe installed;

[0017] In the figure: 1. Coal crushing collection section, 1-1. Rotary air knife joint, 1-2. Air supply and water supply pipe, 1-3. Bearing sleeve, 1-4. Crushing fixed splint, 1-5. Crushing splint positioning hammer, 1-6. Crushing moving splint, 1-7. Outer casing, 1-8. Connecting plate, 1-9. Flushing water pipe, 2. Coal crushing and discharging section. Specific Embodiments

[0018] The following describes a coal crushing and discharging drill pipe applicable to rotary air knife cavity forming of the utility model with reference to the drawings.

[0019] In the first embodiment of the present application, as Figures 1 to 4As shown, the crushed coal discharge drill rod suitable for rotary air knife hole making comprises a crushed coal collecting section 1, a rotary air knife joint 1-1, an air and water supply pipe 1-2, a bearing sleeve 1-3, a crushing fixed splint 1-4, a crushing splint positioning hammer 1-5, a crushing movable splint 1-6, an external sleeve 1-7, a connecting plate 1-8, a flushing water pipe 1-9, and a crushed coal discharge section 2. The crushed coal collecting section 1 is screwed to the crushed coal discharge section 2. The crushed coal collecting section 1 also comprises a rotary air knife joint 1-1, an air and water supply pipe 1-2, a bearing sleeve 1-3, a crushing fixed splint 1-4, a crushing splint positioning hammer 1-5, a crushing movable splint 1-6, an external sleeve 1-7, a connecting plate 1-8, and a rotary air knife joint 1-1 is fixedly installed at the end of the air and water supply pipe 1-2. , the external sleeve 1-7 is coaxially sleeved with the air and water supply pipe 1-2, and the external sleeve 1-7 and the air and water supply pipe 1-2 are connected by a connecting plate 1-8, the air and water supply pipe 1-2 is installed with the external sleeve 1-7 extending from the rotating air knife joint 1-1, and a bearing sleeve 1-3 is provided on the surface of a section of the air and water supply pipe 1-2 extending therefrom, and the bearing sleeve 1-3 is connected to the crushing splint positioning hammer 1-5 through the crushing fixed splint 1-4, the air and water supply pipe 1-2 and the external sleeve 1-7 are equipped with a crushing movable splint 1-6, and the adjacent sides of the crushing movable splint 1-6 and the crushing fixed splint 1-4 are fitted together; the pipeline inside the crushed coal discharge section 2 is connected to the air and water supply pipe 1-2 by threads; strip protrusions are provided on the surfaces of the crushed coal collection section 1 and the crushed coal discharge section 2 along the axial direction.

[0020] The structure of the second embodiment is basically the same as that of the first embodiment, except that Figure 5 As shown, a flushing water pipe 1-9 is provided between the external sleeve 1-7 and the air and water supply pipe 1-2, and the nozzle of the flushing water pipe 1-9 is arranged behind the crushing movable clamping plate 1-6. A pipeline for supplying water to the flushing water pipe 1-9 is arranged inside the crushed coal discharge section 2. The flushing water pipe 1-9 in the interlayer between the external sleeve 1-7 and the air and water supply pipe 1-2 is supplied with water through the built-in cleaning pipeline of the crushed coal discharge section 2 to flush the crushed coal slag, which can further increase the flow speed of the crushed coal slag and effectively prevent the accumulation of the crushed coal slag.

[0021] In order to further optimize the working efficiency of the present application, and to better dock the crushed coal collecting section 1 and the crushed coal discharging section 2 when connected, the outer casing 1-7 and the rear end of the crushed coal discharging section 2 are retracted. In order to enable the drilling rig crushing clamp plate positioning hammer 1-5 to better provide support for the crushing clamp plate 1-4 to prevent it from rotating, the outer surface of the crushing clamp plate positioning hammer 1-5 is provided with a protrusion.

[0022] When in use, install the crushed coal discharge drill rod suitable for rotary air knife hole making, then install the rotary air knife on the rotary air knife joint 1-1, screw the rear end of the air and water supply pipe 1-2 of the crushed coal collection section 1 to the pipeline in the crushed coal discharge section 2, and the drill rod can be put into use.

[0023] When the utility model is in use, the specific operation is as follows:

[0024] When in use, first use a drill bit to drill a gas drainage borehole, then pull out the drill rod, insert the end of the coal fragment collection section 1 with a rotary air knife into the borehole, screw the pipeline of the coal fragment discharge section 2 to the end of the air supply and water supply pipe 1-2 at the rear end of the coal fragment collection section 1, and then dock the outer casing 1-7 with the outer shell of the coal fragment discharge section 2. Gradually add the coal fragment discharge section 2 to push the rotary air knife on the coal fragment collection section 1 to the cavity-forming position, and introduce high-pressure air to drive the rotary air knife to start cavity-forming. At the same time, the drilling rig controls the coal fragment discharge section 2 to drive the coal fragment collection section 1 to perform a small-angle axial rotation by means of the strip-shaped protrusions on the surface of the coal fragment discharge section 2. Since the crushing splint positioning hammer 1-5 abuts against the inner wall of the borehole, the small-angle axially rotating coal fragment collection section 1 drives the crushing moving splint 1-6 and the crushing fixed splint 1-4 to form a shearing force, cutting the larger coal fragments into small coal fragments, and the smaller coal fragments can be discharged from the borehole along the coal fragment discharge section 2 through the interlayer between the air supply and water supply pipe 1-2 and the outer casing 1-7.

[0025] Among them, the air supply and water supply pipe 1-2 will perform a small-angle axial rotation accordingly, and this rotation will not affect the normal operation of the rotary air knife.

[0026] In summary, the coal fragment discharge drill rod applicable to rotary air knife cavity-forming in the embodiment of the utility model replaces the ordinary drill rod with the coal fragment collection section 1 and the coal fragment discharge section 2 with an inner and outer double-layer structure, so that the coal fragments can directly pass through the interlayer between the air supply and water supply pipe 1-2 and the outer casing 1-7 under the action of air flow, achieving the purpose of quickly discharging the coal fragments. At the same time, the coal fragment collection section 1 and the coal fragment discharge section 2 can be slightly twisted by the drilling rig clamping the strip-shaped protrusions arranged axially on the surface of the coal fragment discharge section 2, so that the crushing moving splint 1-6 and the crushing fixed splint 1-4 continuously cut the large coal fragments, preventing the large coal fragments from getting stuck in the interlayer, ensuring that the coal fragments can be smoothly discharged from the borehole, and ensuring that the cavity-forming effect can reach the expected value.

[0027] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present invention is limited to these examples; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity. Any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crushed coal discharge drill rod suitable for rotary air knife hole making, comprising a crushed coal collecting section (1), a rotary air knife joint (1-1), an air and water supply pipe (1-2), a bearing sleeve (1-3), a crushing fixed clamping plate (1-4), a crushing clamping plate positioning hammer (1-5), a crushing movable clamping plate (1-6), an external sleeve (1-7), a connecting plate (1-8), a flushing water pipe (1-9), and a crushed coal discharge section (2), wherein the crushed coal collecting section (1) is screwed to the crushed coal discharge section (2), and is characterized in that: The crushed coal collection section (1) further comprises a rotary air knife joint (1-1), an air supply and water supply pipe (1-2) and a connecting plate (1-8); the rotary air knife joint (1-1) is fixedly installed at the end of the air supply and water supply pipe (1-2); the external sleeve (1-7) is coaxially sleeved with the air supply and water supply pipe (1-2); the external sleeve (1-7) and the air supply and water supply pipe (1-2) are connected via the connecting plate (1-8); the air supply and water supply pipe (1-2) is installed with the external sleeve (1-7) extending from the rotary air knife joint (1-1); the air supply and water supply pipe (1-2) is -2) is provided with a bearing sleeve (1-3) on a surface of a section extending outwardly, the bearing sleeve (1-3) is connected to a crushing clamping plate positioning hammer (1-5) via a crushing fixed clamping plate (1-4), an air supply and water supply pipe (1-2) and an external sleeve (1-7) are provided with a crushing movable clamping plate (1-6), and adjacent surfaces of the crushing movable clamping plate (1-6) and the crushing fixed clamping plate (1-4) are fitted together; the pipeline inside the crushed coal discharge section (2) is connected to the air supply and water supply pipe (1-2) via a thread; strip-shaped protrusions are provided on the surfaces of the crushed coal collection section (1) and the crushed coal discharge section (2) along the axial direction.

2. A coal crushing discharge drill rod suitable for rotary air knife hole making according to claim 1, characterized in that: A flushing water pipe (1-9) is provided between the external sleeve (1-7) and the air and water supply pipe (1-2), and a nozzle of the flushing water pipe (1-9) is arranged behind the crushing movable clamping plate (1-6).

3. The crushed coal discharge drill rod suitable for rotary air knife cavitation according to claim 2, characterized in that: A pipeline for supplying water to the flushing water pipes (1-9) is provided inside the crushed coal discharge section (2).

4. The crushed coal discharge drill rod suitable for rotary air knife cavitation according to claim 1, characterized in that: The rear ends of the outer casing (1-7) and the crushed coal discharge section (2) are contracted.

5. The crushed coal discharge drill rod suitable for rotary air knife cavitation according to claim 4, characterized in that: The outer surface of the crushing clamp positioning hammer (1-5) is provided with a protrusion.

Images