A device for preventing backflow and gas leakage by drilling and punching the lower screen pipe

Abstract

The present invention discloses a device for preventing backwater and gas leakage under a screen pipe during drilling and punching, comprising a drill rod, one end of the drill rod being fixedly connected to a drilling machine, the rear end of the drill rod being connected to a water pipe, one end of the drill rod being fixedly connected to a cutter body, the end of the cutter body away from the drill rod being fixedly connected to a cutter joint, the end of the cutter joint away from the cutter body being fixedly connected to an anti-leakage joint, the cutter body being symmetrically provided with high-pressure nozzles, the cutter joint being provided with a first baffle ball, and the anti-leakage joint being provided with a second baffle ball. The present invention integrates the processes of drilling, hydraulic punching and lowering a gas release pipe into one device, which can not only improve the lowering efficiency of the gas release pipe, but also improve the success rate of lowering the gas release pipe, and at the same time solves the problem of water or gas overflowing into the tunnel through the inner hole of the drill rod during drilling.

Description

Technical Field

[0001] The invention belongs to the technical field of underground coal mine construction, and in particular relates to a device for preventing backwater and gas leakage of a drilling and punching lower screen pipe. Background Art

[0002] During the construction of bottom extraction tunnels in coal mines, a high-pressure water jet is sent into the drill rod to achieve the effect of expanding the hole and creating a hole, so as to facilitate the extraction of gas. During the construction process, it is necessary to drill holes first, then pull out the drill rod, and then use a punching device to hydraulically punch holes, and then pull out the gas pipe under the punching device. Such operation will increase the procedure of lowering the gas release pipe, and the process is cumbersome. Moreover, most of the holes will collapse after punching, resulting in the inability to lower the gas pipe, which seriously affects the construction process. Moreover, during the construction process, due to the upward inclination of the drilling angle of the drill rod, high-pressure water must be used in the process of sending water into the drill rod to prevent the backflow of water. However, at the moment of stopping water injection, it is still impossible to avoid some of the backflow of water and gas from flowing back from the drill rod, which greatly affects the construction. Therefore, there is an urgent need for a device to prevent backwater and gas leakage under the screen pipe during drilling and punching to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a device for preventing backflow and gas leakage of a lower screen pipe by drilling and punching holes, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention discloses a device for preventing backflow and gas leakage of a lower screen pipe during drilling and punching, comprising a drill rod, one end of the drill rod is fixedly connected to a drilling rig, the rear end of the drill rod is connected to a water pipe, one end of the drill rod is fixedly connected to a cutter body, the end of the cutter body away from the drill rod is fixedly connected to a cutter joint, the end of the cutter joint away from the cutter body is fixedly connected to an anti-leakage joint, the cutter body is symmetrically provided with high-pressure nozzles, a first baffle ball is provided in the cutter joint, and a second baffle ball is provided in the anti-leakage joint.

[0005] Preferably, a third through hole is provided in the cutter joint at one end close to the anti-leakage joint, a second through hole is provided in the cutter joint at one end close to the cutter body, and the second blocking ball is located between the third through hole and the second through hole.

[0006] Preferably, the first baffle ball is provided in the cutter body, a first through hole is provided on one side of the cutter body close to the cutter joint, and the first baffle ball is located in the first through hole.

[0007] Preferably, the diameter of the third through hole is greater than the diameter of the second through hole, and the diameter of the second through hole is greater than the diameter of the first through hole.

[0008] The present invention discloses the following technical effects: the present invention integrates drilling, hydraulic punching and lowering of a gas release pipe into one device, which can not only improve the lowering efficiency of the gas release pipe, but also improve the success rate of lowering the gas release pipe, and at the same time solve the problem of water and gas overflowing into the tunnel through the inner hole of the drill pipe during drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0010] Figure 1 It is a schematic diagram of the internal structure of the drill rod of the present invention.

[0011] In the figure: 1, cutter body; 2, cutter joint; 3, high-pressure nozzle; 4, second baffle ball; 5, first baffle ball; 6, anti-leakage joint; 7, third through hole; 8, second through hole; 9, first through hole. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Reference Figure 1 As shown, this embodiment provides a device for preventing backflow and gas leakage of a lower screen pipe during drilling and punching, comprising a drill rod, one end of which is fixedly connected to a drilling rig, the rear end of which is connected to a water pipe, a cutter body 1 is fixedly connected to one end of the drill rod, a cutter joint 2 is fixedly connected to the end of the cutter body 1 away from the drill rod, an anti-leakage joint 6 is fixedly connected to the end of the cutter joint 2 away from the cutter body 1, a high-pressure nozzle 3 is symmetrically arranged on the cutter body 1, a first baffle ball 5 is arranged in the cutter joint 2, and a second baffle ball 4 is arranged in the anti-leakage joint 6.

[0015] The present invention integrates drilling, hydraulic punching and lowering of a gas release pipe into one device, which can not only improve the lowering efficiency of the gas release pipe, but also improve the success rate of lowering the gas release pipe, and also solve the problem of water or gas overflowing into the tunnel through the inner hole of the drill pipe during drilling.

[0016] According to a further optimization scheme, a third through hole 7 is provided at one end of the cutter joint 2 close to the anti-leakage joint 6, a second through hole 8 is provided at one end of the cutter joint 2 close to the cutter body 1, and the second blocking ball 4 is located between the third through hole 7 and the second through hole 8.

[0017] A first blocking ball 5 is provided in the cutter body 1 , and a first through hole 9 is provided on one side of the cutter body 1 close to the cutter joint 2 , and the first blocking ball 5 is located in the first through hole 9 .

[0018] According to a further optimization scheme, the diameter of the third through hole 7 is greater than the diameter of the second through hole 8 , and the diameter of the second through hole 8 is greater than the diameter of the first through hole 9 .

[0019] The anti-leakage joint 6 is connected to a hollow open and close drill bit, and the cutter body 1 is connected to a hollow large-lead spiral drill rod and a water feeder. The third through hole 7 is a multi-head plum blossom or multi-head spiral hole, and the second through hole 8 is a light hole. During normal drilling, water flows from the cutter body 1 to the direction of the anti-backflow and anti-leakage joint 6 at a water pressure of 4-5MPa. The second baffle ball 4 blocks the third through hole, and water flows out from the gap of the third through hole 7. If water does not flow in from the cutter body 1, the second baffle ball 4 will return to the opening of the second through hole 8 to block the light hole to prevent water from flowing back or gas from leaking out. After drilling is completed normally, the first baffle ball 5 is installed from the tail end of the drill pipe. When the water pressure is increased to 10MPa, the first baffle ball 5 blocks the hole at the connection between the two holes. Water is ejected from two 2mm high-pressure nozzles 3 to perform hydraulic punching. After punching the hole, the water pressure is increased to more than 12MPa. The first baffle ball 5 and the second baffle ball 4 are hollowed out, the closed drill bit is opened, and then the gas pipe is lowered from the inside of the drill pipe.

[0020] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for preventing backflow and gas leakage of a lower screen pipe by drilling and punching, characterized in that: The invention comprises a drill rod, one end of which is fixedly connected to a drilling machine, the rear end of which is connected to a water pipe, one end of which is fixedly connected to a cutter body (1), one end of which is away from the drill rod is fixedly connected to a cutter joint (2), one end of which is away from the cutter body (1) is fixedly connected to an anti-leakage joint (6), a high-pressure nozzle (3) is symmetrically arranged on the cutter body (1), a first baffle ball (5) is arranged in the cutter joint (2), and a second baffle ball (4) is arranged in the anti-leakage joint (6); A third through hole (7) is provided at one end of the cutter joint (2) close to the anti-leakage joint (6), a second through hole (8) is provided at one end of the cutter joint (2) close to the cutter body (1), and the second blocking ball (4) is located between the third through hole (7) and the second through hole (8); The cutter body (1) is provided with the first baffle ball (5), a first through hole (9) is provided on one side of the cutter body (1) close to the cutter joint (2), and the first baffle ball (5) is located in the first through hole (9); During normal drilling, water flows from the direction of the cutter body (1) to the direction of the anti-backflow and anti-leakage joint (6) at a water pressure of 4-5 MPa, the second baffle ball (4) blocks the third through hole, and water flows out from the gap of the third through hole (7). If water does not flow from the direction of the cutter body (1), the second baffle ball (4) will return to the opening of the second through hole (8) to block the light hole to prevent water from flowing back or gas from leaking out; after normal drilling, the first baffle ball (5) is installed from the rear end of the drill rod, and when the water pressure is increased to 10 MPa, the first baffle ball (5) blocks the hole at the connection between the two holes, and water is ejected from two 2mm high-pressure nozzles (3) to perform hydraulic punching. After the punching, the water pressure is increased to more than 12 MPa, the first baffle ball (5) and the second baffle ball (4) open the hollow open and closed drill bit, and then the gas pipe is lowered from the inside of the drill rod.

2. A device for preventing backflow and gas leakage of a lower screen pipe by drilling and punching according to claim 1, characterized in that: The diameter of the third through hole (7) is greater than the diameter of the second through hole (8), and the diameter of the second through hole (8) is greater than the diameter of the first through hole (9).

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