Reamer

Abstract

The utility model discloses a reamer which comprises a base and a reamer body, the base is horizontally arranged, and the base is provided with a drilling assembly with the axis vertically arranged. The reamer body is arranged on the periphery of the bottom of the drilling assembly in a sleeving mode in the mode that the matching hole is in coaxial sliding fit with the periphery of the bottom of the drilling assembly, and a combined connecting piece is installed on the periphery of the top of the reamer body. The reamer has the advantages that the reamer body can be coaxially and detachably fixed to the periphery of a drill rod body of a drilling assembly in the mode that the limiting nut is additionally arranged after the top end of the connecting screw penetrates through the connecting hole of the fixing ring plate, and the mode that the reamer body is fixed and combined to the periphery of the drill rod body is simple and easy to achieve; and then, the reamer body can be quickly combined on the periphery of the drill rod body for reaming operation.

Description

Technical Field

[0001] The utility model relates to the field of geological exploration auxiliary components, in particular to a hole expander. Background Art

[0002] Geological survey refers to the investigation and research activities that use various means and methods to survey and detect geology, determine the appropriate bearing layer, determine the foundation type according to the bearing capacity of the bearing layer, and calculate the foundation parameters. In geological survey, drilling methods are often used to observe the natural state of rock and soil layers and the geological structure of each stratum. In the drilling process, in order to facilitate sampling, a reamer is needed to expand the drilling position.

[0003] At present, when the reamer is combined with the drill rod of the drilling device, the two are usually welded together, which makes it impossible to separate the two. Therefore, it is not convenient to separate the drill rod and the reamer for independent use. At the same time, it is not convenient to replace the damaged reamer or drill rod separately at a later stage. Often, they need to be replaced together, which results in high maintenance cost. Utility Model Content

[0004] The purpose of the utility model is to provide a reamer to solve the above-mentioned problem, which is provided with a combined connecting piece, and the fixed ring plate of the combined connecting piece is coaxially fixed to the periphery of the fixed sleeve of the drilling assembly, and the connecting screw is uprightly fixed to the top of the reamer body, so that the reamer body can be coaxially and detachably fixed to the periphery of the drill rod body of the drilling assembly by passing the top end of the connecting screw through the connecting hole of the fixed ring plate and then installing a limit nut. The fixing combination method of the reamer body on the periphery of the drill rod body is simple and easy to achieve, as described below for details.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a reamer, comprising a base and a reamer body, wherein the base is arranged horizontally, and a drilling assembly with an axis arranged vertically is installed on the base, and a matching hole is arranged vertically in the axial direction of the reamer body and coaxially opened in the center, and the reamer body is sleeved on the bottom periphery of the drilling assembly in a coaxial sliding manner with the bottom periphery of the drilling assembly through the matching hole;

[0007] A combined connecting piece is installed on the top periphery of the reamer body, the combined connecting piece is partially fixed on the upper periphery of the drilling assembly, and the reamer body is coaxially detachably connected to the drilling assembly through the combined connecting piece;

[0008] A drilling depth limiting assembly is coaxially arranged around the drilling assembly at a position above the reamer body, and the drilling depth limiting assembly is connected to the combined connecting piece, so as to quantitatively control the limit of the reaming depth by adjusting the position of the drilling depth limiting assembly by axial sliding along the combined connecting piece.

[0009] Preferably, the drilling assembly includes a drive motor and a drill rod body for drilling holes, the drive motor is vertically fixed in the middle of the top surface of the base, the motor shaft at the bottom of the drive motor passes through the bottom surface of the base in a vertical sliding fit, the drill rod body is located below the bottom end of the motor shaft, a fixing sleeve is coaxially fixed to the top end of the drill rod body, and the fixing sleeve is coaxially fixed to the bottom periphery of the motor shaft, and at the same time, the matching hole of the reamer body is coaxially slidingly fitted with the drill rod body.

[0010] Preferably, crushing teeth are evenly distributed around the bottom end of the drill rod body to enable the drill rod body to drill smoothly, mounting plates are vertically fixed on both sides of the top surface of the base, and handles for easy holding are fixed to the outer sides of the mounting plates along the horizontal extension.

[0011] Preferably, the combined connecting piece includes a fixed ring plate and a connecting sleeve, the fixed ring plate is coaxially fixed to the periphery of the fixed sleeve, and a plurality of connecting holes are vertically opened around the top surface of the fixed ring plate, and a plurality of connecting sleeves are vertically fixed to the top surface of the reamer body, the number of the connecting sleeves corresponds to the number of the connecting holes and they are coaxially matched one by one, the connecting sleeves are vertically coaxially fixed with connecting screws, and the top ends of the connecting screws pass through the corresponding connecting holes in a sliding fit, the parts of the connecting screws that pass through the two ends of the corresponding connecting holes are coaxially engaged with limit nuts, and the limit nuts are pressed tightly on the surface of the fixed ring plate.

[0012] Preferably, the bottom ends of the connecting screws are lower than the bottom surface of the base, and the bottom ends of the connecting screws are coaxially combined and connected with the corresponding connecting sleeves by threaded fitting.

[0013] Preferably, the drilling depth limiting assembly includes a plane bearing body, a limit ring plate and a wing plate, the plane bearing body is coaxially sleeved on the periphery of the drill rod body, the limit ring plate is coaxially fixed to the bottom end face of the plane bearing body, and the inner peripheries of the plane bearing body and the limit ring plate do not contact the periphery of the connecting screw, the wing plates are horizontally extended inward and fixed on both sides of the top end face of the plane bearing body, the top surfaces of the wing plates are vertically fixed with sliding sleeves, and the connecting screws at both sides pass through the corresponding wing plates and sliding sleeves on the same side in a vertical sliding fit, the outer sides of the sliding sleeves at both sides that are far away from each other are radially meshed with clamping studs, and the inner ends of the clamping studs at both sides that are close to each other can be clamped on the corresponding periphery of the connecting screw.

[0014] Preferably, the diameter of the limiting ring plate is larger than the maximum rotation diameter of the reamer body, and the end surfaces of the wing plates at both sides that are close to each other do not contact the periphery of the drill pipe body.

[0015] Preferably, handles are coaxially fixed to the outer ends of the clamping studs at both sides that are away from each other.

[0016] The above-mentioned reamer is used, specifically in the process of reaming a drilling position in geological survey, because the combined connecting piece is provided, and the fixing ring plate of the combined connecting piece is coaxially fixed to the periphery of the fixing sleeve of the drilling assembly, and the connecting screw is vertically fixed to the top of the reamer body, so that the reamer body can be coaxially and detachably fixed to the periphery of the drill rod body of the drilling assembly by passing the top end of the connecting screw through the connecting hole of the fixing ring plate and then installing the limiting nut. The fixing and combining method of the reamer body on the periphery of the drill rod body is simple and easy to implement, which makes it convenient to quickly combine the reamer body with the periphery of the drill rod body for reaming operation. When the reamer body and the drill rod body need to be separated later, it is only necessary to unscrew the limiting nut at the upper position and disengage it from the top end of the connecting screw, and then the connecting screw can be vertically slid out of the connecting hole, and then the reamer body can be moved along the axis of the drill rod body through the matching hole. The reamer body is separated from the drill rod body in a manner of moving in an axial direction, and the reamer body is separated from the drill rod body in a simple and easy manner, so that it is convenient to use the reamer body and the drill rod body separately after being separated, and it is also convenient to replace the damaged reamer body or the drill rod body separately at a later time. Since the drilling depth limiting assembly is coaxially arranged around the drill rod body, and the drilling depth limiting assembly is slidably connected to the combined connecting piece by the coaxial sliding cooperation of the sliding sleeve and the connecting screw, the reaming depth can be limited by the contact of the limiting ring plate of the drilling depth assembly with the ground, so that it is convenient to reach the required sampling depth during the drilling and reaming process. In addition, the position height of the limiting ring plate can be adjusted by the sliding sleeve sliding along the axial direction of the connecting screw and by tightening the clamping stud on the periphery of the connecting screw, so that the limitation of the reaming depth can be quantitatively controlled, which further facilitates reaching the required sampling depth during the drilling and reaming process.

[0017] The beneficial effects are as follows: 1. The utility model is provided with a combined connecting piece, and the fixing ring plate of the combined connecting piece is coaxially fixed to the periphery of the fixing sleeve of the drilling assembly, and the connecting screw is vertically fixed to the top of the reamer body, so that the reamer body can be coaxially and detachably fixed to the periphery of the drill rod body of the drilling assembly by passing the top end of the connecting screw through the connecting hole of the fixing ring plate and then installing a limit nut. The fixing and combining method of the reamer body on the periphery of the drill rod body is simple and easy to implement, and then it is convenient to quickly combine the reamer body on the periphery of the drill rod body for reaming operation;

[0018] 2. The connecting screw can be slid out of the connecting hole by simply unscrewing the limit nut, and then the reamer body can be separated from the drill pipe body by axial movement. The reamer body is easy to separate from the drill pipe body, which makes it easy to separate the reamer body and the drill pipe body for separate use, and also makes it easy to replace the damaged reamer body or the drill pipe body separately at a later time.

[0019] 3. A drilling depth limiting assembly is coaxially arranged around the drill rod body, and the drilling depth limiting assembly is slidably connected to the combined connecting piece by coaxial sliding cooperation between the sliding sleeve and the connecting screw, and then the hole expansion depth can be limited by the limit ring plate of the drilling depth assembly contacting the ground, so as to facilitate reaching the required sampling depth during the drilling and hole expansion process;

[0020] 4. The position height of the limit ring plate can be adjusted by sliding the sleeve along the axial direction of the connecting screw and tightening the clamping stud on the outer periphery of the connecting screw, thereby quantitatively controlling the limit of the hole expansion depth, and further facilitating reaching the required sampling depth during the drilling and hole expansion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is an overall axonometric schematic diagram of the utility model;

[0023] Figure 2 This utility model Figure 1 Cross-section diagram Figure 1 ;

[0024] Figure 3 This utility model Figure 1 Cross-section diagram Figure 2 ;

[0025] Figure 4 This utility model Figure 3 A local enlarged view of point A;

[0026] Figure 5 This utility model Figure 1 Cross-section diagram Figure 3 ;

[0027] Figure 6 This utility model Figure 1 The front view of the external image;

[0028] Figure 7 This utility model Figure 1 The left external view of

[0029] Figure 8 This utility model Figure 1 External view from above.

[0030] The following are the descriptions of the reference numerals:

[0031] 1. Base; 101. Mounting plate; 102. Handle; 2. Combined connector; 201. Fixed ring plate; 202. Limit nut; 203. Connecting screw; 204. Connecting sleeve; 205. Connecting hole; 3. Drilling assembly; 301. Drive motor; 302. Drill rod body; 303. Motor shaft; 304. Fixed sleeve; 305. Crushing tooth; 4. Reamer body; 401. Matching hole; 5. Drilling depth limiting assembly; 501. Sliding sleeve; 502. Handle; 503. Wing plate; 504. Plane bearing body; 505. Clamping stud; 506. Limit ring plate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0033] See also Figure 1-Figure 8As shown, the utility model provides a reamer, including a base 1 and a reamer body 4, the base 1 is horizontally arranged, and a drilling assembly 3 with an axis vertically arranged is installed on the base 1, the axial direction of the reamer body 4 is vertically arranged and a matching hole 401 is coaxially opened at the center, and the reamer body 4 is sleeved on the bottom periphery of the drilling assembly 3 in a coaxial sliding manner with the bottom periphery of the drilling assembly 3 through the matching hole 401. Specifically, the drilling assembly 3 includes a driving motor 301 and a drill rod body 302 for drilling and opening holes, the driving motor 301 is vertically fixed to the middle of the top surface of the base 1, and the motor shaft 303 at the bottom of the driving motor 301 is vertically fixed to the middle of the top surface of the base 1, and the motor shaft 303 at the bottom of the driving motor 301 is vertically fixed to the bottom periphery of the drilling assembly 3. The bottom surface of the base 1 is passed through in a sliding manner, and the drill rod body 302 is located below the bottom end of the motor shaft 303. A fixing sleeve 304 is coaxially fixed to the top of the drill rod body 302, and the fixing sleeve 304 is coaxially fixed to the bottom periphery of the motor shaft 303. At the same time, the matching hole 401 of the reamer body 4 is coaxially slidably matched with the drill rod body 302. The purpose of this arrangement is to enable the drive motor 301 to be powered on by being electrically connected to an external power supply cable, and the drive motor 301 drives the drill rod body 302 to rotate through the motor shaft 303. The drilling position can be drilled by the drill rod body 302 rotating while drilling downward.

[0034] See also Figure 1-Figure 5 As shown, a combined connecting piece 2 is installed on the top periphery of the reamer body 4, and a part of the combined connecting piece 2 is fixed on the upper periphery of the drilling assembly 3, and the reamer body 4 is coaxially and detachably connected with the drilling assembly 3 through the combined connecting piece 2. Specifically, the combined connecting piece 2 includes a fixed ring plate 201 and a connecting sleeve 204, and a fixed ring plate 201 is coaxially fixed to the periphery of the fixed sleeve 304, and a plurality of connecting holes 205 are vertically opened on the top surface circumference of the fixed ring plate 201, and a plurality of connecting sleeves 204 are vertically fixed on the top surface circumference of the reamer body 4, and the number of connecting sleeves 204 and the connecting holes 205 correspond and are coaxially matched one by one, and the connecting sleeves 204 are vertically coaxially fixed with connecting screws 203, and the top ends of the connecting screws 203 are all passed through in a sliding fit manner. The corresponding connecting holes 205 and the parts of the connecting screw 203 passing through the corresponding connecting holes 205 at both ends are coaxially meshed with the limiting nuts 202, and the limiting nuts 202 are pressed against the surface of the fixed ring plate 201. The purpose of such a setting is that the reamer body 4 can be coaxially and detachably fixed to the periphery of the drill rod body 302 of the drilling assembly 3 by passing the top end of the connecting screw 203 through the connecting hole 205 of the fixed ring plate 201 and then installing the limiting nut 202. At the same time, the connecting screw 203 can be slid out of the connecting hole 205 by unscrewing the limiting nut 202, and then the reamer body 4 can be separated from the drill rod body 302 by axial movement. The combination and disassembly of the reamer body 4 on the periphery of the drill rod body 302 is simple and easy to achieve.

[0035] See also Figure 1-Figure 5As shown, a drilling depth limiting assembly 5 is coaxially arranged around the drilling assembly 3 at a position above the reamer body 4, and the drilling depth limiting assembly 5 is connected to the combined connecting piece 2, so as to quantitatively control the limit of the reaming depth by adjusting the position of the drilling depth limiting assembly 5 along the axial sliding of the combined connecting piece 2. Specifically, the drilling depth limiting assembly 5 includes a plane bearing body 504, a limiting ring plate 506 and a wing plate 503. The plane bearing body 504 is coaxially sleeved on the periphery of the drill rod body 302, and the limiting ring plate 506 is coaxially fixed on the bottom end face of the plane bearing body 504, and the inner circumference of the plane bearing body 504 and the limiting ring plate 506 does not contact the periphery of the connecting screw 203, and the top end face of the plane bearing body 504 is horizontally extended inwardly and fixed with wing plates 503, and the top surface of the wing plate 503 is A sleeve 501 is fixed vertically, and the connecting screws 203 at both sides pass through the corresponding wing plates 503 and sleeves 501 on the same side in a vertical sliding fit. The outer sides of the sleeves 501 at both sides that are away from each other are radially meshed and interspersed with clamping studs 505, and the inner ends of the clamping studs 505 at both sides that are close to each other can be clamped on the outer periphery of the corresponding connecting screws 203. The advantage of such a setting is that the hole expansion depth can be limited by the limit ring plate 506 of the drilling depth assembly contacting the ground. More specifically, the position height of the limit ring plate 506 can be adjusted by the sleeve 501 sliding axially along the connecting screw 203 and by screwing the clamping studs 505 to press it on the outer periphery of the connecting screw 203, thereby quantitatively controlling the limit of the hole expansion depth.

[0036] See also Figure 1-Figure 5 As shown, the drilling assembly 3, the combined connector 2 and the drilling depth limiting assembly 5 are optimized as follows: from the temple to the drilling assembly 3, crushing teeth 305 are evenly distributed around the bottom end of the drill rod body 302 for smoothly drilling the drill rod body 302, so that the drill rod body 302 can more smoothly enter the drilling position of geological survey by setting the crushing teeth 305, and mounting plates 101 are vertically fixed on both sides of the top surface of the base 1, and handles 102 for easy holding are fixed along the lateral extension of the outer side of the mounting plate 101. With this arrangement, it is convenient to drive the base 1 and the drilling assembly 3 to descend together by holding the handle 102 and applying force to complete the downward feeding of the drill rod body 302.

[0037] Specifically for the combined connector 2, the bottom end of the connecting screw 203 is lower than the bottom surface of the base 1, and the bottom end of the connecting screw 203 is coaxially combined with the corresponding connecting sleeve 204 by threaded matching. With this arrangement, it is convenient for the connecting screw 203 and the connecting sleeve 204 to be quickly combined together by twisting. Specifically for the drilling depth limiting component 5, the diameter of the limiting ring plate 506 is larger than the maximum rotation diameter of the reamer body 4, and the end surfaces of the wing plates 503 at the two side positions that are close to each other do not contact the periphery of the drill rod body 302. With this arrangement, it is convenient for the bottom surface of the limiting ring plate 506 to contact the top ground of the drilling opening position to limit the drilling depth. At the same time, optionally, the outer ends of the clamping studs 505 at the two side positions that are far away from each other are coaxially fixed with handles 502, so that the clamping studs 505 can be twisted by holding the handles 502 and applying force.

[0038] With the above structure, in the process of expanding the hole at the drilling position in geological survey, the combined connecting member 2 is provided, and the fixing ring plate 201 of the combined connecting member 2 is coaxially fixed to the periphery of the fixing sleeve 304 of the drilling assembly 3, and the connecting screw 203 is vertically fixed to the top of the reamer body 4, so that the reamer body 4 can be coaxially and detachably fixed to the drill rod body 302 of the drilling assembly 3 by passing the top of the connecting screw 203 through the connecting hole 205 of the fixing ring plate 201 and then installing the limit nut 202. The fixing and assembly mode of the reamer body 4 on the periphery of the drill rod body 302 is simple and easy to implement, and then the reamer body 4 can be quickly assembled on the periphery of the drill rod body 302 for reaming operation. When the reamer body 4 and the drill rod body 302 need to be separated later, it is only necessary to unscrew the limit nut 202 at the upper position to disengage from the top of the connecting screw 203, and then the connecting screw 203 can be vertically slid out of the connecting hole 205, and then the reamer body 4 can be moved along the axial direction of the drill rod body 302 through the matching hole 401. The reamer body 4 can be separated from the drill rod body 302 in a moving manner, and the reamer body 4 can be separated from the drill rod body 302 in a simple and easy manner, so that the reamer body 4 and the drill rod body 302 can be separated and used separately, and the damaged reamer body 4 or the drill rod body 302 can be replaced separately later. Since a drilling depth limiting component 5 is coaxially arranged around the drill rod body 302, and the drilling depth limiting component 5 is coaxially slidably matched with the combined connecting piece 203 through the sliding sleeve 501 and the connecting screw 203, They are connected by sliding, and then the hole expansion depth can be limited by the way that the limit ring plate 506 of the drilling depth assembly contacts the ground, which is convenient for reaching the required sampling depth during the drilling and hole expansion process. Moreover, since the sleeve 501 slides axially along the connecting screw 203 and is pressed against the outer periphery of the connecting screw 203 by twisting the clamping stud 505, the position height of the limit ring plate 506 can be adjusted, and then the limit of the hole expansion depth can be quantitatively controlled, which is further convenient for reaching the required sampling depth during the drilling and hole expansion process.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A reamer, comprising a base (1) and a reamer body (4), characterized in that: The base (1) is arranged horizontally, and a drilling assembly (3) with an axis arranged vertically is installed on the base (1); a matching hole (401) is arranged vertically in the axial direction of the reamer body (4) and is coaxially opened at the center, and the reamer body (4) is sleeved on the bottom periphery of the drilling assembly (3) in a coaxial sliding manner with the bottom periphery of the drilling assembly (3) through the matching hole (401); A combined connecting piece (2) is installed on the top periphery of the reamer body (4), and a portion of the combined connecting piece (2) is fixed on the upper periphery of the drilling assembly (3), and the reamer body (4) is coaxially detachably connected to the drilling assembly (3) through the combined connecting piece (2); A drilling depth limiting assembly (5) is coaxially arranged around the drilling assembly (3) at a position above the reamer body (4), and the drilling depth limiting assembly (5) is connected to the combined connecting piece (2) so as to quantitatively control the limit of the reaming depth by adjusting the position of the drilling depth limiting assembly (5) by axial sliding along the combined connecting piece (2).

2. A reamer according to claim 1, characterized in that: The drilling assembly (3) comprises a driving motor (301) and a drill rod body (302) for drilling holes, wherein the driving motor (301) is vertically fixed to the middle of the top surface of the base (1), and the motor shaft (303) at the bottom of the driving motor (301) passes through the bottom surface of the base (1) in a vertical sliding fit manner, and the drill rod body (302) is located below the bottom end of the motor shaft (303), and a fixing sleeve (304) is coaxially fixed to the top end of the drill rod body (302), and the fixing sleeve (304) is coaxially fixed to the bottom periphery of the motor shaft (303), and at the same time, the matching hole (401) of the reamer body (4) is coaxially slidingly matched with the drill rod body (302).

3. A reamer according to claim 2, characterized in that: Crushing teeth (305) are evenly distributed around the bottom end of the drill rod body (302) to facilitate the drilling of the drill rod body (302). Mounting plates (101) are vertically fixed on both sides of the top surface of the base (1), and handles (102) are fixed to the outer sides of the mounting plates (101) along a horizontal extension for easy holding.

4. A reamer according to claim 2 or 3, characterized in that: The combined connecting member (2) comprises a fixed ring plate (201) and a connecting sleeve (204); the fixed ring plate (201) is coaxially fixed to the periphery of the fixed sleeve (304); a plurality of connecting holes (205) are vertically opened around the top surface of the fixed ring plate (201); a plurality of connecting sleeves (204) are vertically fixed to the top surface of the reamer body (4); the number of the connecting sleeves (204) corresponds to the number of the connecting holes (205) and they are coaxially matched one by one; the connecting sleeves (204) are vertically coaxially fixed with connecting screws (203); the top ends of the connecting screws (203) pass through the corresponding connecting holes (205) in a sliding fit; the portions of the connecting screws (203) passing through the two ends of the corresponding connecting holes (205) are coaxially meshed with the limiting nuts (202); and the limiting nuts (202) are pressed tightly against the surface of the fixed ring plate (201).

5. A hole expander according to claim 4, characterized in that: The bottom ends of the connecting screws (203) are lower than the bottom surface of the base (1), and the bottom ends of the connecting screws (203) are coaxially combined and connected with the corresponding connecting sleeves (204) by means of threaded engagement.

6. A reamer according to claim 4, characterized in that: The drilling depth limiting assembly (5) comprises a plane bearing body (504), a limiting ring plate (506) and a wing plate (503); the plane bearing body (504) is coaxially sleeved on the periphery of the drill rod body (302); the limiting ring plate (506) is coaxially fixed to the bottom end surface of the plane bearing body (504); the inner peripheries of the plane bearing body (504) and the limiting ring plate (506) do not contact the periphery of the connecting screw (203); both sides of the top end surface of the plane bearing body (504) extend horizontally inwards. The wing plate (503) is fixed, and a sliding sleeve (501) is vertically fixed to the top surface of the wing plate (503), and the connecting screws (203) at both sides pass through the corresponding wing plate (503) and the sliding sleeve (501) on the same side in a vertical sliding fit manner, and the outer positions of the sliding sleeves (501) at both sides that are far away from each other are radially meshed and interspersed with clamping studs (505), and the inner ends of the clamping studs (505) at both sides that are close to each other can be clamped on the outer periphery of the corresponding connecting screw (203).

7. A hole expander according to claim 6, characterized in that: The diameter of the limiting ring plate (506) is larger than the maximum rotation diameter of the reamer body (4), and the end surfaces of the wing plates (503) at both sides that are close to each other do not contact the periphery of the drill rod body (302).

8. A reamer according to claim 6 or 7, characterized in that: The outer ends of the clamping studs (505) at both sides that are away from each other are coaxially fixed with handles (502).

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