Reamer bit for breaking PE / PVC (polyethylene / polyvinyl chloride) hole sealing pipe of underground coal mine hydraulic tunnel drilling machine

Abstract

The utility model discloses a reamer bit for breaking a PE / PVC (polyethylene / polyvinyl chloride) hole sealing pipe of an underground coal mine hydraulic underground drill rig, which comprises a cylindrical drill bit body, the rear end of the drill bit body is connected with the end of a fishing drill rod, and at least five rows of alloy sawteeth are uniformly distributed on the outer wall of the drill bit body at equal angles in the circumferential direction. The heights of each row of alloy sawteeth are sequentially arranged from front to back and from low to high, the distance between the tooth tip of each alloy sawtooth with the low height and the axis of the drill bit body is smaller than the radius of the inner circumference of the hole sealing pipe, and the distance between the tooth tip of each alloy sawtooth with the high height and the axis of the drill bit body is larger than the radius of the outer circumference of the hole sealing pipe. According to the reamer bit, the alloy sawteeth distributed on the side face of the bit body are utilized, the reamer bit is rotated through a drilling machine, sharp sawtooth alloy makes full contact with a PE / PVC hole sealing pipe, and the PE / PVC hole sealing pipe from the hole opening of a drilled hole to the interior of the hole can be rapidly and effectively broken.

Description

Technical Field

[0001] This utility model relates to the technical field of drill pipe retrieval, and in particular to a hole-reaming drill bit for breaking PE / PVC sealing pipes in a hydraulic tunnel drilling rig in a coal mine. Background Technology

[0002] When hydraulic tunnel drilling rigs are used for gas extraction or other drilling operations in coal and rock strata underground in coal mines, PE / PVC sealing pipes are used for sealing the boreholes. When the drill rod threads are not intact or drilling encounters difficulties such as borehole collapse or soft coal during construction, the drill rod is prone to breakage and burial, necessitating retrieval operations. However, when the PE / PVC sealing pipe from the borehole opening to the inside of the hole is deformed by coal pressure, or when the diameter of the sealing pipe is smaller than the diameter of the retrieval drill bit and drill rod, the entire PE / PVC sealing pipe from the borehole opening to the inside of the hole must be broken and the borehole diameter enlarged before retrieval operations can commence. This ensures that the retrieval drill bit can smoothly enter the hole before retrieval can be carried out. Based on this, a borehole enlargement drill bit for breaking PE / PVC sealing pipes in underground hydraulic tunnel drilling rigs for coal mines is provided. Utility Model Content

[0003] The purpose of this utility model is to provide a hole-enlarging drill bit for breaking PE / PVC sealing pipes in a hydraulic tunnel drilling rig in a coal mine, which can successfully break the PE / PVC sealing pipes from the borehole opening to the inside of the hole.

[0004] The technical solution adopted by this utility model is a hole-expanding drill bit for breaking PE / PVC sealing pipes in a hydraulic tunnel drilling rig for coal mines. It includes a cylindrical drill bit body, the rear end of which is connected to the end of a retrieval drill rod. At least five rows of alloy saw teeth are evenly distributed around the outer wall of the drill bit body at equal angles. The height of each row of alloy saw teeth is arranged from low to high from front to back. The distance between the tip of the lower alloy saw teeth and the axis of the drill bit body is less than the inner circumferential radius of the sealing pipe, while the distance between the tip of the higher alloy saw teeth and the axis of the drill bit body is greater than the outer circumferential radius of the sealing pipe.

[0005] Furthermore, the distance between the tip of the high-strength alloy saw teeth and the axis of the drill bit body is 15 to 25 mm greater than the outer circumference radius of the sealing tube.

[0006] Furthermore, each row of alloy serrated spirals is arranged in the same direction as the drilling direction of the drill bit body.

[0007] Furthermore, the length of each row of alloy saw teeth along the axis of the drill bit body is not less than 200mm.

[0008] Furthermore, the alloy saw teeth are welded and fixed to the outer wall of the drill bit body.

[0009] The reaming drill bit of this utility model has the following beneficial effects:

[0010] The reaming drill bit of this utility model utilizes alloy saw teeth distributed on the side of the drill bit body. By rotating the reaming drill bit with the drilling machine, the sharp saw teeth alloy make full contact with the PE / PVC sealing pipe, which can quickly and effectively break the PE / PVC sealing pipe from the drill hole opening to the hole. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram: 1-Sealing pipe, 2-Drill bit body, 3-Alloy saw teeth, 4-Retrieving drill rod, 5-Broken or buried drill rod. Detailed Implementation

[0013] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed description of a borehole-expanding drill bit for breaking PE / PVC sealing pipes in a coal mine underground hydraulic tunnel drilling rig.

[0014] like Figure 1 As shown, a drilling bit for breaking PE / PVC sealing pipes in a hydraulic tunnel drilling rig for coal mines includes a cylindrical drill bit body 2. The rear end of the drill bit body 2 is connected to the end of a retrieval drill rod 4. At least five rows of alloy saw teeth 3 are evenly distributed circumferentially on the outer wall of the drill bit body 2. The height of each row of alloy saw teeth 3 is arranged from low to high from front to back. The distance between the tip of the alloy saw teeth 3 and the axis of the drill bit body 2 is less than the inner circumferential radius of the sealing pipe 1, and the distance between the tip of the alloy saw teeth 3 and the axis of the drill bit body 2 is greater than the outer circumferential radius of the sealing pipe 1.

[0015] In this embodiment, the alloy saw teeth 3 are welded and fixed to the outer wall of the drill bit body 2. Each row of alloy saw teeth 3 is spirally arranged, with the spiral direction consistent with the drilling direction of the drill bit body 2. The length of each row of alloy saw teeth 3 along the axis of the drill bit body 2 is not less than 200mm. The height of the saw teeth alloy 2 is arranged sequentially from front to back from low to high. The front end of the reaming drill bit can enter the sealing tube 1, and the rear diameter of the reaming drill bit is 30 to 50mm larger than the outer diameter of the sealing tube 1.

[0016] When using the reaming drill bit of this embodiment to retrieve a broken or buried drill rod 5 in a hydraulic tunnel drilling rig in a coal mine, the PE / PVC sealing pipe from the borehole opening to the inside of the hole can be broken to facilitate the retrieval operation.

[0017] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A hole-reaming drill bit for breaking PE / PVC sealing pipes in a hydraulic tunnel drilling rig for underground coal mines, characterized in that, The drill bit body (2) includes a cylindrical body. The rear end of the drill bit body (2) is connected to the end of the fishing drill rod (4). At least five rows of alloy saw teeth (3) are evenly distributed around the outer wall of the drill bit body (2) at equal angles. The height of each row of alloy saw teeth (3) is arranged from low to high from front to back. The distance between the tip of the alloy saw teeth (3) with the height of the lower height and the axis of the drill bit body (2) is less than the inner radius of the sealing tube (1). The distance between the tip of the alloy saw teeth (3) with the height of the higher height and the axis of the drill bit body (2) is greater than the outer radius of the sealing tube (1).

2. The reaming drill bit for breaking PE / PVC sealing pipes in a coal mine underground hydraulic tunnel drilling rig according to claim 1, characterized in that, The distance between the tip of the high-strength alloy saw teeth (3) and the axis of the drill body (2) is 15 to 25 mm greater than the outer circumference of the sealing tube (1).

3. The reaming drill bit for breaking PE / PVC sealing pipes in a coal mine underground hydraulic tunnel drilling rig according to claim 1 or 2, characterized in that, Each row of alloy saw teeth (3) is arranged in a spiral, with the spiral direction consistent with the drilling direction of the drill bit body (2).

4. The reaming drill bit for breaking PE / PVC sealing pipes in a coal mine underground hydraulic tunnel drilling rig according to claim 3, characterized in that, Each row of alloy saw teeth (3) has a length of not less than 200 mm along the axis of the drill bit body (2).

5. The reaming drill bit for breaking PE / PVC sealing pipes in a coal mine underground hydraulic tunnel drilling rig according to claim 1, characterized in that, Alloy saw teeth (3) are welded and fixed to the outer wall of the drill bit body (2).

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