Hole opening clamping and pipe clamping device for coal mine underground pitching-up drill hole

Abstract

The utility model relates to the technical field of coal mining, and discloses a coal mine underground upward drilling orifice clamping pipe clamping device, which comprises a flange plate and a drill rod, the inner side of the flange plate is fixedly connected with a connecting steel pipe, and the outer surface of the connecting steel pipe is fixedly provided with a fixed tray. Compared with a traditional device, the double-fixing function of the rock core pipe and the drill rod is achieved, operation convenience and safety reliability are achieved at the same time, rapid clamping can be achieved without complex debugging, and the high-risk operation mode that a traditional technology depends on manual supporting is avoided; the mechanical wedge-caulking principle ensures that the fixing force is enhanced along with the increase of the external force, the falling hidden danger is eliminated from the source, the safety risk of orifice operation is greatly reduced, and meanwhile, efficient and safe operation guarantee is provided for underground coal mine high-risk scenes.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and more specifically, to a device for clamping and holding pipes at the opening of an upward-facing borehole in a coal mine. Background Technology

[0002] The underground overhead drilling hole clamping device is a special device used to temporarily clamp and fix the casing, drill rod or core tube inside the hole during overhead drilling. It is mainly used in drilling construction projects such as gas extraction, water control, and geological exploration in coal mines. When drilling overhead holes underground, there are often situations where drill rods need to be pulled up and down and core tubes need to be taken out from the hole.

[0003] In underground coal mine operations, drill rods, casings, core tubes, and other equipment often need to be temporarily fixed at the borehole opening for operation, according to the requirements of the procedures. However, the existing process lacks a dedicated temporary fixing device for the borehole opening when drilling upwards, which makes the drill bit prone to loosening and slipping due to its own weight, the impact of high-pressure water flow, or construction vibration. This problem may not only cause equipment failures such as borehole blockage and drill bit damage, but also significantly increase the safety risks such as mechanical injuries to personnel, seriously affecting the safety and efficiency of underground operations. Therefore, improvement and optimization are needed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a pipe clamping device for the borehole opening of an upward-facing borehole in a coal mine, which has the advantages of convenience and safety and reliability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipe clamping device for an upward-drilling borehole in a coal mine, comprising a flange and a drill rod. A connecting steel pipe is fixedly connected to the inner side of the flange, and a fixed tray is fixedly installed on the outer surface of the connecting steel pipe. A movable slot for clamping the shaft is opened inside the connecting steel pipe. Temporary pipe clamping assemblies are fixedly installed on both sides of the top of the fixed tray. The temporary pipe clamping assembly includes upright plates fixedly installed on both sides of the top of the fixed tray, and the upright plates are located on both sides of the movable slot for clamping the shaft. A rotating shaft is rotatably installed between the two upright plates. An eccentric clamping shaft is fixedly installed on the outer surface of the rotating shaft. Alloy teeth are fixedly welded to the outer surface of the eccentric clamping shaft. A wrench is welded to the outer surface of the rotating shaft.

[0006] As a preferred embodiment of this utility model, the inner wall of the connecting steel pipe is fixedly equipped with anti-slip protrusions, which are installed in a linear array at equal intervals.

[0007] As a preferred embodiment of this utility model, a sleeve is fixedly fitted onto the outer surface of the wrench, and the sleeve is in the shape of an annular ring.

[0008] As a preferred embodiment of this utility model, the outer surface of the flange is provided with connection holes, and the connection holes are arranged in a circumferential array.

[0009] As a preferred embodiment of this utility model, the fixed tray is of equal size at the top and bottom and is located directly below the flange.

[0010] As a preferred embodiment of this utility model, the movable groove of the retaining shaft is arc-shaped, and the range of its opening is larger than the range of rotation of the eccentric retaining shaft.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention securely mounts the main flange of the device to the borehole opening using fixing bolts. The upper end of the drill rod can be connected to a core tube with a diameter smaller than the drill rod. When it is necessary to remove the drill rod and take out the core tube, the drilling rig disassembles the through-hole drill rod section by section. When the core tube is reached, an external force is applied to pull the wrench upwards, driving the rotating shaft to rotate synchronously with the eccentric locking shaft. The eccentric locking shaft rotates inwards, causing the alloy teeth to radially press against the outer wall of the core tube. This mechanical wedging principle achieves a double fixing effect. The alloy teeth fit tightly against the core tube wall, utilizing frictional resistance to create a self-locking state that tightens with increasing pressure, completely offsetting external forces such as self-weight and high-pressure water flow impact, eliminating the risk of loosening and slippage. Simultaneously, when… In case of drilling rig failure, the same operation can be used to quickly lock the drill rod with alloy teeth, temporarily fixing it to the inner wall of the connecting steel pipe to form a rigid clamp, thus providing a safe operating window for drilling rig maintenance. Compared with traditional devices, this device achieves dual fixing functions for the core tube and drill rod, combining ease of operation and safety and reliability: it can quickly clamp without complicated debugging, avoiding the high-risk operation mode of traditional processes that rely on manual support; the mechanical wedging principle ensures that the fixing force increases with the increase of external force, eliminating the risk of falling from the source and greatly reducing the safety risk of borehole operations, while providing efficient and safe operation guarantee for high-risk scenarios in coal mines. Attached Figure Description

[0013] Figure 1 This is a frontal three-dimensional appearance structural diagram of the present utility model;

[0014] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0015] Figure 3 This is a schematic diagram of the fixed tray structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the connecting steel pipe structure of this utility model;

[0017] Figure 5 This is a schematic cross-sectional view of the present invention.

[0018] Figure 6 This is a schematic diagram of the anti-slip protrusion structure of this utility model.

[0019] In the diagram: 1. Flange; 2. Connecting steel pipe; 3. Fixed pallet; 4. Temporary clamping pipe assembly; 401. Vertical plate; 402. Rotating shaft; 403. Eccentric clamping shaft; 404. Wrench; 405. Gasket; 406. Alloy teeth; 5. Clamping shaft movable groove; 6. Anti-slip protrusion; 7. Drill rod; 8. Connecting hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1 to 6 As shown, this utility model provides a pipe clamping device for an upward drilling hole in a coal mine, including a flange 1 and a drill rod 7. A connecting steel pipe 2 is fixedly connected to the inner side of the flange 1, and a fixed tray 3 is fixedly installed on the outer surface of the connecting steel pipe 2. A shaft clamping groove 5 is opened inside the connecting steel pipe 2. Temporary pipe clamping assemblies 4 are fixedly installed on both sides of the top of the fixed tray 3. The temporary pipe clamping assembly 4 includes upright plates 401 fixedly installed on both sides of the top of the fixed tray 3, and the upright plates 401 are located on both sides of the shaft clamping groove 5. A rotating shaft 402 is rotatably installed between the two upright plates 401. An eccentric shaft clamp 403 is fixedly installed on the outer surface of the rotating shaft 402. Alloy teeth 406 are fixedly welded to the outer surface of the eccentric shaft clamp 403. A wrench 404 is welded to the outer surface of the rotating shaft 402.

[0022] First, the workers fixed flange 1 to the overhead borehole using bolts. A core tube with a smaller diameter than the drill pipe 7 is installed at the upper end of the drill rod 7. During overhead borehole drilling, it is common to remove the drill rod 7 and extract the core tube from the hole. This can be done by removing the drill rod 7 section by section using a drilling rig. Since the core tube's diameter is smaller than the drill rod 7, when the core tube is retrieved, the wrench 404 needs to be turned upwards using external force. The wrench 404 will then rotate the shaft 402. When the shaft 402 rotates, it will rotate the eccentric retaining shaft 403. When the eccentric retaining shaft 403 rotates, the alloy teeth 406 will engage and hold the core tube in place. The core tube is tightly fitted to the hole wall of the connecting steel pipe 2, and the frictional resistance makes it tighter and tighter, thus stabilizing the core tube inside the connecting steel pipe 2 and preventing it from loosening and slipping due to its own weight or high-pressure water flow, thereby improving the safety and efficiency of construction. When the drilling rig malfunctions, the same principle applies, causing the eccentric locking shaft 403 to rotate and drive the alloy teeth 406 to abut and lock the drill rod 7, making the drill rod 7 tightly fitted to the hole wall of the connecting steel pipe 2 and temporarily fixed at the hole opening of the connecting steel pipe 2, firmly clamping the drill rod 7. When it is necessary to release the temporary clamping, simply move the wrench 404 downwards, causing the rotating shaft 402 to drive the eccentric locking shaft 403 and the alloy teeth 406 to release the contact with the drill rod 7 or the core tube.

[0023] Workers securely install the main flange 1 of the device onto the borehole opening using fixing bolts. The upper end of the drill rod 7 can be connected to a core tube with a diameter smaller than the drill rod 7. When it is necessary to remove the drill rod 7 and take out the core tube, the drilling rig disassembles the through-hole drill rod 7 section by section. When reaching the core tube position, the wrench 404 is pulled upwards by external force, driving the rotating shaft 402 to rotate the eccentric locking shaft 403 synchronously. The eccentric locking shaft 403 screws in, causing the alloy teeth 406 to radially press against the outer wall of the core tube. This achieves a double fixing effect through the mechanical wedging principle. The alloy teeth 406 fit tightly against the core tube wall, using frictional resistance to create a self-locking state that tightens with increasing pressure, completely offsetting external forces such as self-weight and high-pressure water flow impact, preventing loosening and slippage. This device reduces the risk of falling, and when the drilling rig malfunctions, the same operation can be used to quickly lock the drill rod 7 with the alloy teeth 406, temporarily fixing it to the inner wall of the connecting steel pipe 2 to form a rigid clamp, thus providing a safe operating window for drilling rig maintenance. Compared with traditional devices, this device achieves a dual fixing function for the core tube and the drill rod 7, combining ease of operation with safety and reliability: it can quickly clamp without complicated debugging, avoiding the high-risk operation mode of traditional processes that rely on manual support; the mechanical wedging principle ensures that the fixing force increases with the increase of external force, eliminating the risk of falling from the source, greatly reducing the safety risk of borehole operations, and providing efficient and safe operation guarantee for high-risk scenarios in coal mines.

[0024] Among them, anti-slip protrusions 6 are fixedly installed on the inner wall of the connecting steel pipe 2, and are installed at equal intervals in a linear array.

[0025] Anti-slip protrusions 6 are fixedly installed on the inner wall of the connecting steel pipe 2 and are installed in a linear array at equal intervals. This can effectively increase the friction of the drill rod 7 and the core tube when the eccentric clamping shaft 403 drives the alloy teeth 406 to temporarily clamp them.

[0026] Among them, the outer surface of the wrench 404 is fixedly fitted with a sleeve 405, and the sleeve 405 is in the shape of a ring.

[0027] The wrench 404 has a washer 405 fixedly fitted on its outer surface, which can effectively increase the operating comfort of the operator when using the wrench 404.

[0028] The flange 1 has connection holes 8 on its outer surface, and the connection holes 8 are arranged in a circumferential array.

[0029] The flange 1 has connection holes 8 on its outer surface, and the connection holes 8 are arranged in a circular array, which makes it easy to fix the flange 1 to the overhead drill hole with external fixing bolts.

[0030] The fixed tray 3 is of equal size at the top and bottom and is located directly below the flange 1.

[0031] By fixing the tray 3 in a shape with equal upper and lower parts and placing it directly below the flange 1, it can effectively provide support for the upright plate 401.

[0032] The movable groove 5 of the retaining shaft is arc-shaped and its opening range is larger than the rotation range of the eccentric retaining shaft 403.

[0033] The eccentric ...

[0034] Working principle and usage process of this utility model:

[0035] First, the workers fixed flange 1 to the overhead borehole using bolts. A core tube with a smaller diameter than the drill pipe 7 is installed at the upper end of the drill rod 7. During overhead borehole drilling, it is common to remove the drill rod 7 and extract the core tube from the hole. This can be done by removing the drill rod 7 section by section using a drilling rig. Since the core tube's diameter is smaller than the drill rod 7, when the core tube is retrieved, the wrench 404 needs to be turned upwards using external force. The wrench 404 will then rotate the shaft 402. When the shaft 402 rotates, it will rotate the eccentric retaining shaft 403. When the eccentric retaining shaft 403 rotates, the alloy teeth 406 will engage and hold the core tube in place. The core tube is tightly fitted to the hole wall of the connecting steel pipe 2, and the frictional resistance makes it tighter and tighter, thus stabilizing the core tube inside the connecting steel pipe 2 and preventing it from loosening and slipping due to its own weight or high-pressure water flow, thereby improving the safety and efficiency of construction. When the drilling rig malfunctions, the same principle applies, causing the eccentric locking shaft 403 to rotate and drive the alloy teeth 406 to abut and lock the drill rod 7, making the drill rod 7 tightly fitted to the hole wall of the connecting steel pipe 2 and temporarily fixed at the hole opening of the connecting steel pipe 2, firmly clamping the drill rod 7. When it is necessary to release the temporary clamping, simply move the wrench 404 downwards, causing the rotating shaft 402 to drive the eccentric locking shaft 403 and the alloy teeth 406 to release the contact with the drill rod 7 or the core tube.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for clamping a pipe at the mouth of an upwardly inclined borehole in a coal mine, comprising a flange (1) and a drill rod (7), characterised in that: The inner side of the flange plate (1) is fixedly connected with a connecting steel pipe (2), the outer surface of the connecting steel pipe (2) is fixedly installed with a fixed tray (3), the inside of the connecting steel pipe (2) is provided with a clamping shaft movable slot (5), the top of the fixed tray (3) is fixedly installed with a temporary clamping pipe assembly (4) on both sides, the temporary clamping pipe assembly (4) comprises a vertical plate (401) fixedly installed on both sides of the top of the fixed tray (3), and the vertical plate (401) is located on both sides of the clamping shaft movable slot (5), a rotating shaft (402) is rotatably installed between the two vertical plates (401), an eccentric clamping shaft (403) is fixedly installed on the outer surface of the rotating shaft (402), alloy teeth (406) are fixedly welded on the outer surface of the eccentric clamping shaft (403), and a wrench (404) is welded on the outer surface of the rotating shaft (402).

2. The device according to claim 1, characterized in that: The inner wall of the connecting steel pipe (2) is fixedly installed with anti-skid protrusions (6) which are linearly arrayed and installed at equal intervals.

3. The device according to claim 1, characterized in that: The outer surface of the wrench (404) is fixedly sleeved with a sleeve pad (405), and the sleeve pad (405) is annular.

4. The device according to claim 1, characterized in that: The outer surface of the flange plate (1) is provided with connecting holes (8) which are circumferentially arrayed.

5. The device according to claim 1, characterized in that: The fixed tray (3) is equal in size from top to bottom and is located directly below the flange plate (1).

6. The device according to claim 1, characterized in that: The clamping shaft movable slot (5) is circular arc-shaped and has a range greater than that of the rotation of the eccentric clamping shaft (403).

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