Mine underground adaptive multi-diameter reamer

Abstract

The invention discloses a mine underground adaptive multi-diameter reamer. The mine underground adaptive multi-diameter reamer comprises a connecting and fixing shaft, a reaming diameter piece, reaming brush teeth and a connecting and fixing piece. Wherein the reaming diameter pieces are evenly fixed to the fixing shaft in a reinforced welding mode, the reaming diameter pieces are connected into a whole through the connecting and fixing pieces, and it is guaranteed that the whole stability of the reaming diameter pieces is kept in the reaming process; the advancing face of the broaching brush of the broaching diameter part is arranged in the middle of the inclined face and fixed to the broaching diameter device in an inner buckling or welding mode. The front section of the reamer is connected with a drill bit matched with a drilling machine through threads, the tail end of the reamer is also connected with a drill rod matched with the drilling machine through threads, the original drill bit is used for breaking rocks, the reamer is used for secondary reaming, and one-time forming is achieved. The patent of the invention provides a mine underground adaptive multi-diameter reamer which aims to solve the problem that the size of a matched drill hole of underground drilling equipment cannot well meet the requirement of a mine underground drill hole with a special effect, and the reamer can change the size of a reaming diameter piece according to specific requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of underground construction production drilling, in particular to an underground mine adaptable multi-diameter reamer. Background Art

[0002] During mining operations, many tunnels are excavated solely to accommodate pipelines. These pipelines require no maintenance or other maintenance tasks throughout their lifecycle, often requiring only complete replacement. Currently, these tunnels are typically drilled or blasted based on the length of the pipelines. However, these drilled holes are often irregular, with larger diameters at the top and smaller diameters at the bottom. Alternatively, they can be drilled head-on, resulting in larger holes at the ends and smaller holes in the middle, complicating subsequent installation. If drilling is used, conventional drilling rigs are not suitable for longer holes. Rigs capable of drilling longer holes are either expensive or large, and the tunnel cross-section and construction location dimensions are not adequate. Existing solutions often involve enlarging the cross-section or converting the tunnel into a tunnel. This not only significantly increases production costs, but also reduces space utilization and increases the construction time, negatively impacting the company's operations. Summary of the Invention

[0003] The purpose of the present invention is to provide an adaptive multi-diameter reamer for underground mines to address the above-mentioned shortcomings, thereby solving the problem that existing underground mine drilling rigs cannot meet production needs.

[0004] The present invention is achieved through the following solutions: A multi-diameter reamer suitable for underground mining includes a first expanding brush portion and a second expanding brush portion; the first expanding brush portion and the second expanding brush portion are coaxially arranged, and the first expanding brush portion and the second expanding brush portion are both provided with expanding brush diameter parts at circumferential positions, and the size of the expanding brush diameter part on the first expanding brush portion is not larger than the size of the expanding brush diameter part on the second expanding brush portion; the end of the first expanding brush portion away from the second expanding brush portion is provided with a first connecting portion for connecting to an external drill bit; the end of the second expanding brush portion away from the first expanding brush portion is provided with a second connecting portion for connecting to an external drill rod, and the first expanding brush portion and the second expanding brush portion are detachably connected.

[0005] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, the first expanding brush portion includes a first brush diameter expanding member, a first fixing member and a first connecting shaft; the two ends of the first connecting shaft are respectively provided with a first threaded boss and a threaded internal thread hole; the first brush diameter expanding members are evenly spaced around the circumferential position of the first connecting shaft; the first fixing member is arranged between adjacent first brush diameter expanding members.

[0006] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, the first brush diameter expanding member includes a first end face and a second end face, the first end face is arranged close to the first connecting shaft, and the second end face is arranged away from the first connecting shaft; the first end face is an arc-shaped structure adapted to the curvature of the side wall of the first connecting shaft; the second end face is a planar structure.

[0007] Based on the above-mentioned structure of a multi-diameter hole expander suitable for underground mines, a first rock-breaking slope is also provided on the first brush diameter expanding member. The first rock-breaking slope is arranged on the end face of the first brush diameter expanding member close to the first threaded boss. The first rock-breaking slope is arranged at an angle of 120 degrees from the tail 1 / 4 of the first brush diameter expanding member to the drilling direction.

[0008] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, four reaming brush holes are arranged on the first rock-breaking inclined surface along the direction of rotary drilling, and reaming brush teeth are set in the reaming brush holes; the reaming brush holes at the intersection of the two surfaces are arranged tangent to the two surfaces, and the remaining two reaming brush holes are evenly arranged in the middle; the reaming brush holes are set at an inclination angle from the outside to the inside according to a predetermined angle.

[0009] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, the expansion brush tooth holes are arranged to be inclined at 3°, 4°, 5°, and 6° from the outside to the inside, and the overall wrapping of the expansion brush ruler must not be less than 1 / 3 of the length of the expansion brush ruler. The interior of the expansion brush tooth hole is arranged to be threaded, connected to the expansion brush tooth thread, and reinforced by welding.

[0010] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, the second expanding brush portion includes a second expanding brush diameter member, a second fixing member and a second connecting shaft; second threaded bosses and threaded internal threads are respectively provided at both ends of the second connecting shaft; the second expanding brush diameter members are evenly spaced around the circumferential position of the second connecting shaft; the second fixing member is arranged between adjacent second expanding brush diameter members; the second expanding brush diameter member includes a third end face and a fourth end face, the third end face is arranged close to the second connecting shaft, and the fourth end face is arranged away from the second connecting shaft; the third end face is an arc-shaped structure adapted to the curvature of the side wall of the second connecting shaft; the fourth end face is a planar structure.

[0011] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, a second rock-breaking slope is also provided on the second expanding brush diameter member. The second rock-breaking slope is arranged on the end face of the second expanding brush diameter member close to the second threaded boss. The second rock-breaking slope is arranged at an angle of 109 degrees from the tail 1 / 4 of the second expanding brush diameter member to the drilling direction.

[0012] Based on the above-mentioned structure of a multi-diameter reamer suitable for underground mines, 5 expansion brush holes are arranged on the second rock-breaking slope along the direction of rotational drilling, and expansion brush teeth are set in the expansion brush holes; 5 expansion brush holes are evenly arranged in the direction of rotational drilling on the second rock-breaking slope, among which the expansion brush holes at the intersection of the two surfaces are arranged tangent to the two surfaces, and the remaining three holes are evenly arranged in the middle, and the expansion brush holes are arranged to be inclined at 2°, 3°, 4°, 5°, and 6° from the outside to the inside, respectively.

[0013] Based on the above-mentioned structure of a mine underground adaptable multi-diameter reamer, a rotation fastening slot is provided at the tail position of the first connecting shaft and the second connecting shaft.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this solution, two-stage expanding brush parts are provided, which can expand the predetermined hole diameter in different sizes respectively. Through a reamer, the predetermined area can be expanded efficiently. When in use, the end of the first expanding brush part is connected to the drill bit; the position of the second expanding brush part is connected to the drilling rig, and the drilling and expanding operations are realized through the drilling rig. This solves the problem that the size of the drilling hole matched with the underground drilling equipment cannot well meet the needs of drilling holes with special functions in the mine. The reamer can change the size of the expanding diameter according to specific requirements.

[0015] 2. In this solution, the head of the first expanding brush part is connected to the drill bit through a first threaded boss, and the tail of the first expanding brush part is connected to the second expanding brush part through a threaded internal thread hole; this can make the entire structure easier to maintain in the later stage, and the expanding brush part can be replaced separately according to the damage of the expanding brush part, reducing the later maintenance cost and difficulty; at the same time, in this solution, the first expanding brush diameter part is connected as a whole through the first fixing part, so that the expanding brush diameter part on the entire first expanding brush part can be more stable during the hole expansion operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the first brush expansion part of the present invention; Figure 3 Schematic diagram of the main structure of the second brush expansion part of the present invention; Description of the drawings: 1. First brush expanding part; 2. Second brush expanding part; 11. First brush diameter expanding member; 12. First fixing member; 13. First connecting shaft; 14. First threaded boss; 15. First end face; 16. Second end face; 17. First rock-breaking slope; 18. Brush tooth hole for expanding; 21. Second brush diameter expanding member; 22. Second fixing member; 23. Second connecting shaft; 24. Threaded inner hole; 25. Second rock-breaking slope; 26. Rotary fastening slot. DETAILED DESCRIPTION

[0017] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0018] Any feature disclosed in this specification (including any appended claims and abstract), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0019] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0020] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of such features.

[0021] Example 1 like Figures 1 to 3 As shown, the present invention provides a technical solution: A multi-diameter reamer suitable for underground mining, which at least includes but is not limited to a first expanding brush part 1 and a second expanding brush part 2; the first expanding brush part 1 and the second expanding brush part 2 are coaxially arranged, and expanding brush diameter parts are provided at circumferential positions of the first expanding brush part 1 and the second expanding brush part 2, and the size of the expanding brush diameter part on the first expanding brush part 1 is not larger than the size of the expanding brush diameter part on the second expanding brush part 2; the end of the first expanding brush part 1 away from the second expanding brush part 2 is provided with a first connecting part for connecting to an external drill bit; the end of the second expanding brush part 2 away from the first expanding brush part 1 is provided with a second connecting part for connecting to an external drill rod, and the first expanding brush part 1 and the second expanding brush part 2 are detachably connected.

[0022] Based on the above structure, a two-stage expanding brush part is provided in this scheme, which can respectively expand the predetermined hole diameter to different sizes, and can efficiently expand the predetermined area through a reamer; when in use, the end of the first expanding brush part 1 is connected to the drill bit; the position of the second expanding brush part 2 is connected to the drilling rig, and the drilling and expanding operations are realized through the drilling rig.

[0023] As an example, the first brush expanding portion 1 may include a first brush diameter expanding member 11, a first fixing member 12 and a first connecting shaft 13; the first connecting shaft 13 has a first threaded boss 14 and a threaded internal thread hole 24 at both ends respectively; the first brush diameter expanding member 11 is evenly spaced around the circumferential position of the first connecting shaft 13; the first fixing member 12 is arranged between adjacent first brush diameter expanding members 11.

[0024] Based on the above structure, the head of the first expanding brush part 1 is connected to the drill bit through the first threaded boss 14, and the tail of the first expanding brush part 1 is connected to the second expanding brush part 2 through the threaded internal thread hole 24; this can make the entire structure easier to maintain in the later stage, and the expanding brush part can be replaced separately according to the damage of the expanding brush part, reducing the later maintenance cost and maintenance difficulty; at the same time, in this solution, the first expanding brush diameter part 11 is connected as a whole through the first fixing part 12, so that the expanding brush diameter part on the entire first expanding brush part 1 can be more stable during the hole expansion operation.

[0025] As an example, the first brush diameter expanding member 11 may include a first end face 15 and a second end face 16, the first end face 15 is arranged close to the first connecting shaft 13, and the second end face 16 is arranged away from the first connecting shaft 13; the first end face 15 is an arc-shaped structure adapted to the curvature of the side wall of the first connecting shaft 13; the second end face 16 is a planar structure.

[0026] Based on the above structure, by setting the first end surface 15 as an arc structure, the contact area between the first brush diameter expanding member 11 and the first connecting shaft 13 can be increased, so that the first brush diameter expanding member 11 can be more firmly connected to the first connecting shaft 13.

[0027] As an example, the first brush diameter expanding member 11 is also provided with a first rock-breaking slope 17. The first rock-breaking slope 17 is arranged on the end face of the first brush diameter expanding member 11 close to the first threaded boss 14. The first rock-breaking slope 17 is arranged at an angle of 120 degrees from the tail 1 / 4 of the first brush diameter expanding member 11 to the drilling direction.

[0028] Four expansion brush holes 18 are arranged on the first rock-breaking inclined surface 17 along the rotary drilling direction, and expansion brush teeth are set in the expansion brush holes 18; the expansion brush holes 18 at the intersection of the two surfaces are arranged tangentially to the two surfaces, so that the expansion brush teeth can also be used at the end of the reamer, and the remaining two expansion brush holes 18 are evenly arranged in the middle.

[0029] In order to ensure the stability of the expansion brush teeth during use and protect the expansion brush teeth from being damaged during the rock crushing process, the expansion brush tooth holes 18 are set at an inclination angle from the outside to the inside according to a predetermined angle, which can effectively decompose the cutting force of rock breaking to the reaming diameter part, reduce damage to the front of the cutting ruler, and at the same time ensure that the reamer has sufficient wrapping of the expansion brush teeth. After many field tests, the expansion brush tooth holes 18 of this example are set to be inclined at 3°, 4°, 5°, and 6° from the outside to the inside, and the overall wrapping of the expansion brush ruler must not be less than 1 / 3 of the length of the expansion brush ruler. The inside of the expansion brush tooth hole 18 is set to be threaded, connected to the expansion brush tooth thread, and reinforced by welding.

[0030] As an example, the second brush expanding portion 2 may include a second brush diameter expanding member 21, a second fixing member 22 and a second connecting shaft 23; second threaded bosses and threaded internal threads 24 are respectively provided at both ends of the second connecting shaft 23; the second brush diameter expanding members 21 are evenly spaced around the circumferential position of the second connecting shaft 23; the second fixing member 22 is provided between adjacent second brush diameter expanding members 21.

[0031] Based on the above structure, the head of the second expanding brush part 2 is connected to the tail of the first expanding brush part 1 through the second threaded boss, and the tail of the second expanding brush part 2 is connected to the drill rod through the threaded internal thread hole 24; this can make the entire structure easier to maintain in the later stage, and the expanding brush part can be replaced separately according to the damage of the expanding brush part, reducing the later maintenance cost and maintenance difficulty; at the same time, in this solution, the second expanding brush diameter part 21 is connected as a whole through the second fixing part 22, so that the expanding brush diameter part on the entire second expanding brush part 2 can be more stable during the hole expansion operation.

[0032] As an example, the second brush diameter expanding member 21 may include a third end face and a fourth end face, the third end face is arranged close to the second connecting shaft 23, and the fourth end face is arranged away from the second connecting shaft 23; the third end face is an arc structure adapted to the curvature of the side wall of the second connecting shaft 23; the fourth end face is a planar structure.

[0033] Based on the above structure, by setting the third end surface as an arc structure, the contact area between the second brush diameter expanding member 21 and the second connecting shaft 23 can be increased, so that the second brush diameter expanding member 21 can be more firmly connected to the second connecting shaft 23.

[0034] As an example, a second rock-breaking slope 25 is also provided on the second brush diameter expanding member 21. The second rock-breaking slope 25 is provided on the end face of the second brush diameter expanding member 21 close to the second threaded boss. The second rock-breaking slope 25 is arranged at an angle of 109 degrees from the tail 1 / 4 of the second brush diameter expanding member 21 to the drilling direction.

[0035] Five expanding brush holes 18 are arranged on the second rock-breaking inclined surface 25 along the rotary drilling direction, and expanding brush teeth are set in the expanding brush holes 18; five expanding brush holes 18 are evenly arranged in the rotary drilling direction of the rock-breaking inclined surface, among which the expanding brush holes 18 at the intersection of the two surfaces are arranged tangentially to the two surfaces, and the remaining three holes are evenly arranged in the middle. From the outside to the inside, the expanding brush holes 18 are set to be inclined at 2°, 3°, 4°, 5°, and 6° in sequence.

[0036] Based on the above structure, by specially setting the expansion brush tooth angles on the first rock breaking slope 17 and the second rock breaking slope 25, the cutting force of rock breaking can be effectively decomposed onto the hole expansion diameter part, reducing damage to the front of the cutting ruler.

[0037] As an example, a rotation fastening slot 26 is provided at the tail position of the first connecting shaft 13 and the second connecting shaft 23, and the rotation fastening slot 26 is used to fasten the first expanding brush part 1 and the second expanding brush part 2, or to fasten the first expanding brush part 1 and the drill bit.

[0038] In this scheme, the expansion diameter parts in each stage of the expansion reamer are fixed to the connecting fixed shaft by welding. The welding length between the expansion diameter parts and the connecting fixed shaft is greater than 30mm. The T-joint welding should be carried out by electroslag welding. Normalizing treatment must be carried out after welding to ensure the strength of the welded joint.

[0039] The forward direction of each connecting fixed shaft is external thread, and the tail is internal thread. Similar to the drill rod, they are all hollow designs to facilitate water cooling and gas removal of slag. The internal and external threads should be machined on a lathe. The tooth profile adopts a trapezoidal thread design with a trapezoidal angle of 15°. The nominal diameter, number of threads, pitch and rotation direction are matched with the drill rod and drill bit. The position of the internal and external threads must ensure a wall thickness of at least 10mm while ensuring that they can match the drill rod and drill bit to prevent damage by shear force during drilling.

[0040] The connecting shaft is provided with a horizontal rotating fastening surface at its rear end, which can be automatically tightened using the clamps on the upper and lower drill rods of the drill rig itself, or manually tightened using a wrench. To ensure sufficient operating space between the upper and lower reamer stages, or between the reamer and the drill rod and drill bit, the spacing between the rotating fastening surface and the rear end of the connecting shaft must be no less than 10 mm.

[0041] The aforementioned rotational tightening direction should align with the drilling direction. The reamer, drill bit, and drill rod are all tightened by threaded rotation. To ensure the effective wall thickness of the connecting shaft after machining the rotational tightening surface and threaded opening, as well as the effective contact area between the rotational tightening surface and the clamp or wrench, the rotational fastening surface should be designed to be no longer than 30mm and no less than 25mm in length, and no wider than 30mm and no less than 20mm in width. While meeting these requirements, maximize the effective wall thickness.

[0042] The two sets of expansion joints corresponding to the two-stage reamer are evenly distributed on their corresponding connecting shafts. Each set is arranged on the same horizontal cross-section, at a 90-degree angle to the connecting shaft, and reinforced by welding. The spacing between the expansion joints and the ends of the connecting shaft is no less than 20 mm, leaving ample space for installing the reamer and welding the expansion joints.

[0043] In order to ensure that the connection strength with the connecting fixed shaft meets the drilling requirements, the end of the above-mentioned hole expansion diameter part is designed to be an arc surface to increase the fit with the connecting fixed shaft and enhance the strength of the weld after welding. The arc length is determined according to the thickness of the hole expansion diameter part, and the diameter of the arc surface is consistent with the diameter of the connecting fixed shaft.

[0044] In this example, each set of reamer components consists of six, with angles of 60 degrees between them. The components can be evenly spaced or evenly spaced according to actual conditions. Width and thickness should be maximized while ensuring sufficient operating space and a reasonable overall layout of each level. In this example, the width is set to 75mm and the thickness is set to 30mm. The length should be determined based on the required reaming diameter, rock properties, and the reaming adapter rating. This example uses a two-stage reamer: the first reamer expands the drilled hole to 200mm, and the second reamer expands it to 400mm. Due to centrifugal force during drilling, the actual hole diameter may be 5-15mm larger than the drill bit or reamer (depending on rock properties). Therefore, the lengths of the reamer components in this example are set to 195mm and 395mm (both including the radius of the connecting shaft).

[0045] The end and tail of the reamer are designed to have the same thickness. To maximize the rock-breaking surface area of ​​the brush during reaming, the tail is designed with a rock-breaking slope facing the drilling direction to accommodate the brush teeth. The placement of the rock-breaking slope should be adjusted based on the specifications of the drill bit, the reamer's grading, and the lithology.

[0046] The expansion brush teeth are evenly distributed on the rotary drilling side of the rock-breaking slope. In this example, the expansion brush teeth are made of high-strength, high-toughness cemented carbide or diamond composite materials, with a diameter of 10 mm and a length of 15 mm, depending on the size of the expansion brush and the rock properties. The expansion brush teeth are installed in the expansion brush hole 18 on the rock-breaking slope and reinforced with welding to prevent damage to the entire expansion brush tooth during the expansion drilling process.

[0047] The connecting fixture is arranged between adjacent brush diameter expansion members in the same group to ensure the integrity of the brush diameter expansion members in the same group and to assist in transmitting the torque and impact force generated by the drilling rig. The connecting fixture is generally installed at the rock-breaking slope at the tail of the brush diameter expansion member. The connecting fixture in this example is made of the same material as the hole diameter expansion member, with a width set to one-third of the width of the connecting fixture and a thickness set to 10mm. The surface of the connecting fixture in contact with the hole diameter expansion member is arranged as an inclined surface, fits the hole diameter expansion member, and is reinforced by welding.

[0048] The connecting fixed shaft in this solution has the function of connecting the drill rod of the fixed drilling rig and the original rock breaking drill bit. It can not only transmit the torque and impact force brought to the drill bit by the drilling rig itself, but also drive the hole expansion diameter part to break the rock and expand the hole size based on the original hole size of the drill bit. Its material and quality requirements are the same as or slightly higher than the original one to avoid damage during the drilling and expanding process.

[0049] Hole expansion parts: They have the function of secondary hole expansion after drilling. They are connected to the fixed shaft by welding to receive the torque and impact force of the drilling rig. While the drill bit is breaking the rock, the drill hole formed by the drill bit is also broken for the second time to form the required hole size. In theory, the hole expansion diameter of the hole expansion parts can be adjusted at will according to demand, but in fact, the power and stability of the drilling rig directly affect the specifications of the hole expansion parts. According to the actual matching of the existing drilling rig equipment, in principle, the hole expansion diameter of the matching hole expansion parts cannot exceed 3 times the matching drill bit diameter parts, and the matching hole expansion parts cannot exceed two levels. Too many levels or the diameter of the hole expansion parts is too large, which will cause damage to the reamer and lead to waste holes.

[0050] Expansion brush teeth: mainly used for hole expansion and crushing, expanding the drill hole size to the size of the expansion diameter. Its material and layout are particularly important. It must be made of high-strength and high-toughness cemented carbide or diamond composite materials and other high-strength materials to ensure that it is not easily worn or damaged.

[0051] Connecting and fixing parts: The brush diameter expanding parts are evenly arranged on the connecting and fixing shaft. They mainly have the function of transmitting torque and impact force, as well as controlling the size of the expanded hole diameter. Therefore, in order to ensure the overall firmness of the expanded hole diameter parts, connecting and fixing parts are set to reinforce and fix the adjacent expanded hole diameter parts.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-diameter reamer for underground mines, characterized by: The invention comprises a first expanding brush portion (1) and a second expanding brush portion (2); the first expanding brush portion (1) and the second expanding brush portion (2) are coaxially arranged, and a brush diameter expanding member is provided at a circumferential position of the first expanding brush portion (1) and the second expanding brush portion (2); the size of the brush diameter expanding member on the first expanding brush portion (1) is not larger than the size of the brush diameter expanding member on the second expanding brush portion (2); a first connecting portion for connecting to an external drill bit is provided at an end of the first expanding brush portion (1) away from the second expanding brush portion (2); a second connecting portion for connecting to an external drill rod is provided at an end of the second expanding brush portion (2) away from the first expanding brush portion (1), and the first expanding brush portion (1) and the second expanding brush portion (2) are detachably connected.

2. The mine underground adaptable multi-diameter reamer according to claim 1, characterized in that: The first brush expanding portion (1) comprises a first brush diameter expanding member (11), a first fixing member (12) and a first connecting shaft (13); first threaded bosses (14) and threaded internal holes (24) are respectively provided at both ends of the first connecting shaft (13); the first brush diameter expanding members (11) are evenly spaced around the circumferential position of the first connecting shaft (13); and the first fixing member (12) is provided between adjacent first brush diameter expanding members (11).

3. The mine underground adaptable multi-diameter reamer according to claim 2, characterized in that: The first brush diameter expanding member (11) comprises a first end face (15) and a second end face (16), wherein the first end face (15) is arranged close to the first connecting shaft (13), and the second end face (16) is arranged away from the first connecting shaft (13); the first end face (15) is an arc-shaped structure adapted to the curvature of the side wall of the first connecting shaft (13); and the second end face (16) is a planar structure.

4. The mine underground adaptable multi-diameter reamer according to claim 3, characterized in that: The first brush diameter expanding member (11) is further provided with a first rock-breaking inclined surface (17), which is arranged on the end surface of the first brush diameter expanding member (11) close to the first threaded boss (14), and the first rock-breaking inclined surface (17) is arranged at an angle of 120 degrees from the upper tail 1 / 4 of the first brush diameter expanding member (11) toward the drilling direction.

5. The mine underground adaptable multi-diameter reamer according to claim 4, characterized in that: Four expansion brush tooth holes (18) are arranged on the first rock-breaking inclined surface (17) along the rotary drilling direction, and expansion brush teeth are arranged in the expansion brush tooth holes (18); the expansion brush tooth holes (18) at the intersection of the two surfaces are arranged tangentially to the two surfaces, and the remaining two expansion brush tooth holes (18) are evenly arranged in the middle; the expansion brush tooth holes (18) are arranged at an inclined angle from the outside to the inside according to a predetermined angle.

6. The mine underground adaptable multi-diameter reamer according to claim 5, characterized in that: The brush expansion tooth holes (18) are arranged to be inclined at 3°, 4°, 5°, and 6° from the outside to the inside, and the overall wrapping of the brush expansion ruler shall not be less than 1 / 3 of the length of the brush expansion ruler. The brush expansion tooth holes (18) are arranged to be threaded, connected to the brush expansion teeth, and reinforced by welding.

7. The mine underground adaptable multi-diameter reamer according to claim 6, characterized in that: The second brush expanding portion (2) comprises a second brush diameter expanding member (21), a second fixing member (22) and a second connecting shaft (23); a second threaded boss and a threaded inner hole (24) are respectively provided at both ends of the second connecting shaft (23); the second brush diameter expanding members (21) are evenly spaced around the circumferential position of the second connecting shaft (23); the second fixing member (22) is provided between adjacent second brush diameter expanding members (21); the second brush diameter expanding member (21) comprises a third end face and a fourth end face, the third end face is provided close to the second connecting shaft (23), and the fourth end face is provided away from the second connecting shaft (23); the third end face is an arc-shaped structure adapted to the curvature of the side wall of the second connecting shaft (23); and the fourth end face is a plane structure.

8. The mine underground adaptable multi-diameter reamer according to claim 7, characterized in that: The second brush diameter expanding member (21) is further provided with a second rock-breaking inclined surface (25), which is provided on the second brush diameter expanding member (21) near the end surface of the second threaded boss, and the second rock-breaking inclined surface (25) is arranged at an angle of 109 degrees from the upper tail 1 / 4 of the second brush diameter expanding member (21) toward the drilling direction.

9. The mine underground adaptable multi-diameter reamer according to claim 8, characterized in that: Five expansion brush tooth holes (18) are arranged on the second rock-breaking inclined surface (25) along the rotary drilling direction, and expansion brush teeth are arranged in the expansion brush tooth holes (18); five expansion brush tooth holes (18) are evenly arranged on the second rock-breaking inclined surface (25) in the rotary drilling direction, wherein the expansion brush tooth holes (18) at the intersection of two surfaces are arranged tangentially to the two surfaces, and the remaining three holes are evenly arranged in the middle, and the expansion brush tooth holes (18) are arranged in an inclination of 2°, 3°, 4°, 5°, and 6° from the outside to the inside.

10. The mine underground adaptable multi-diameter reamer according to claim 9, characterized in that: Rotational fastening slots (26) are provided at the tail positions of the first connecting shaft (13) and the second connecting shaft (23).

Images