Drilling engineering reamer

Abstract

This invention provides a drilling reamer for well drilling. The main body is cylindrical with multiple sliding holes arranged circumferentially. A locking mechanism is located between the main body and the mounting rod. Multiple grinding blocks are evenly arranged circumferentially, with the uppermost group of grinding blocks slidingly positioned. A top rod is slidably positioned within the sliding holes. A transmission mechanism has an input end and an output end; the input end connects to the slidingly positioned grinding blocks, and the output end connects to the top rod. When the grinding blocks slide, the top rod extends out of the sliding holes and abuts against the mounting rod. This invention, by allowing the grinding blocks to slide up and down and by providing a transmission mechanism with an input and output end (the input end connecting to the slidingly positioned grinding blocks and the output end connecting to the top rod), ensures a more secure fixation between the reamer and the mounting rod. When the inner hole releases pressure on the grinding blocks, the top rod resets and retracts into the sliding holes, reducing the difficulty of disassembling the reamer.

Description

Technical Field

[0001] This invention belongs to the field of drilling equipment technology, and more specifically, relates to a drilling reamer for drilling engineering. Background Technology

[0002] During drilling, unstable formations can easily cause the wellbore to neck and shrink, leading to resistance and jamming when pulling the drill string up, making it impossible to retrieve smoothly. In severe cases, this can result in lost circulation, well collapse, and other complex situations. In the early stages of exploration and development well operations, we frequently encountered resistance and jamming during tripping, casing installation, and logging. In these situations, it is necessary to simultaneously pull up and rotate the drill string to reshape the wellbore and enlarge its diameter; this process is called reaming.

[0003] When performing reverse reaming, the upper inclined surface of the reamer (which is covered with hard alloy) is often used to trim the well wall. After the reamer passes through, the drill bit is used to trim the well wall to complete the entire reverse reaming operation.

[0004] However, the downward force exerted on the grout during the reverse grouting process can easily cause it to fall off. To prevent this, the grout is usually connected with more connectors to make it more secure, which in turn makes the installation and removal of the grout inconvenient. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling tool for well engineering that can effectively prevent it from being pushed off the ground and reduce the difficulty of installation and disassembly.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A drilling reamer is provided, comprising a body, a locking mechanism, multiple grinding blocks, a top rod, and a transmission mechanism. The body is cylindrical, with multiple sliding holes arranged along its circumference. The locking mechanism is located between the body and the mounting rod, allowing for detachable connection between the body and the mounting rod. The multiple grinding blocks are evenly arranged along the circumference of the body, and are divided into multiple groups arranged axially along the body, with the uppermost group of grinding blocks slidably arranged. The top rod is slidably disposed within the sliding holes, and a reset assembly is provided between the top rod and the body. When the reset assembly is in its natural state, the top rod is retracted into the sliding holes. The transmission mechanism has an input end and an output end. The input end is connected to the slidably arranged grinding blocks, and the output end is connected to the top rod. When the grinding blocks slide, they can drive the top rod to extend out of the sliding holes and abut against the mounting rod.

[0007] In one possible implementation, the transmission mechanism includes a slide groove on the body and a transmission medium disposed within the slide groove. The slide groove includes a first vertical groove, a first horizontal groove, a second vertical groove, and a second horizontal groove. The first vertical groove is L-shaped and has a horizontally arranged transverse groove and a vertically arranged vertical groove. The transverse groove is connected to the inner hole of the body and is located at the top of the vertical groove. The first horizontal groove is horizontally arranged and connected to the vertical groove. The second vertical groove is vertically arranged and connected to the first horizontal groove. The second horizontal groove is horizontally arranged, with one end connected to the second vertical groove and the other end connected to the inner hole of the body. The top rod is slidably disposed within the second horizontal groove. A pressure block is provided on the slidably disposed grinding block. The pressure block is inserted into the first vertical groove. The pressure block presses down, pushing the transmission medium to move along the slide groove. The transmission medium pushes the top rod to slide.

[0008] In one possible implementation, the pressing block consists of horizontal and vertical blocks arranged perpendicularly to each other, with the vertical blocks inserted into a portion of the vertical groove, and the horizontal blocks of the pressing block inserted into the horizontal groove, wherein the height of the horizontal groove is greater than the height of the horizontal blocks.

[0009] In one possible implementation, the transmission medium includes a first transmission rod, a second transmission rod, and a third transmission rod. The first transmission rod is slidably disposed within the vertical groove, the second transmission rod is slidably disposed within the first horizontal groove, and the third transmission rod is slidably disposed within the second vertical groove. The top end of the first transmission rod abuts against the bottom end of the vertical block. The bottom end of the first transmission rod has a first inclined surface. One end of the second transmission rod has a second inclined surface, and the other end of the second transmission rod has a third inclined surface. The first inclined surface abuts against the second inclined surface, allowing the first transmission rod to slide along the first horizontal groove when it slides down. One end of the third transmission rod has a fourth inclined surface, and the other end of the third transmission rod has a fifth inclined surface. The third inclined surface abuts against the fourth inclined surface, allowing the second transmission rod to slide along the second vertical groove when it slides. One end of the top rod has a sixth inclined surface, which abuts against the fifth inclined surface, allowing the top rod to slide along the second horizontal groove when it slides.

[0010] In one possible implementation, a first receiving groove is provided below the vertical groove, a second receiving groove is provided at the end of the second horizontal groove away from the first vertical groove, and a third receiving groove is provided above the second vertical groove.

[0011] In one possible implementation, the sidewall of the vertical block abuts against the sidewall of the vertical groove, the sidewall of the top rod abuts against the sidewall of the second horizontal groove, and the transmission medium includes hydraulic oil.

[0012] In one possible implementation, the reset assembly includes a reset groove located on one side of the second transverse groove. A first spring is provided inside the reset groove and is connected to the top rod. When the first spring is in its natural state, the top rod is completely retracted into the second transverse groove.

[0013] In one possible implementation, the mounting rod is provided with a first slot, and the top rod can be partially locked into the first slot due to its extension.

[0014] In one possible implementation, the snap-fit ​​mechanism includes a snap-fit ​​hole, a snap-fit ​​ball, and a snap-fit ​​groove. The snap-fit ​​hole is located on the body, and a second spring is provided inside the snap-fit ​​hole. The snap-fit ​​ball is connected to the second spring. When the second spring is in its natural state, a portion of the snap-fit ​​ball is located outside the snap-fit ​​hole. The snap-fit ​​groove is located on the mounting rod, and the snap-fit ​​ball is snapped into the snap-fit ​​groove, thereby fixing the body to the mounting rod.

[0015] In one possible implementation, the two adjacent sets of grinding blocks are arranged alternately.

[0016] The beneficial effects of the drilling reamer provided by this invention are as follows: Compared with the prior art, this invention sets the grinding block to slide up and down, and sets the transmission mechanism to have an input end and an output end. The input end is connected to the slidably arranged grinding block, and the output end is connected to the top rod. When the grinding block is subjected to force and moves downward, it will drive the top rod to extend outward through the transmission mechanism and abut against the mounting rod, so that the reamer and the mounting rod are more securely fixed. When the pressure on the grinding block is released from the inner hole, the top rod is retracted into the sliding hole by the reset component, reducing the difficulty of disassembling the reamer. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of the installation state of a drilling reamer provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a drilling reamer provided in an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of a drilling reamer provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the slide provided in an embodiment of the present invention.

[0022] The labels for the attached figures are as follows:

[0023] 1. Mounting rod; 2. Body; 3. Snap-fit ​​mechanism; 4. Grinding block; 5. Top rod; 6. Pressure block;

[0024] 301. Second spring; 302. Ball catcher;

[0025] 601. Horizontal block; 602. Vertical block; 603. First transmission rod; 604. Second transmission rod; 605. Third transmission rod; 606. Horizontal groove; 607. Vertical groove; 608. First horizontal groove; 609. Second vertical groove; 610. Second horizontal groove; 611. First receiving groove; 612. Second receiving groove; 613. Third receiving groove; 614. Slot. Detailed Implementation

[0026] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0028] When an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element.

[0029] The terms “length,” “width,” “up,” “down,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "a number" means one or more, unless otherwise explicitly specified.

[0031] The drilling reamer provided by this invention will now be described.

[0032] Please refer to the following: Figure 1 , Figure 2 and Figure 3 The drilling reamer includes a body 2, a locking mechanism 3, multiple grinding blocks 4, a top rod 5, and a transmission mechanism. The body 2 is cylindrical and has multiple sliding holes arranged along its circumference. The locking mechanism 3 is located between the body 2 and the mounting rod, allowing for a detachable connection between the body 2 and the mounting rod. The multiple grinding blocks 4 are evenly arranged along the circumference of the body 2 and are divided into multiple groups arranged along the axial direction of the body 2, with the uppermost group of grinding blocks 4 slidingly arranged. The top rod 5 is slidably disposed within the sliding hole, and a reset component is provided between the top rod 5 and the body 2. When the reset component is in its natural state, the top rod 5 is retracted into the sliding hole. The transmission mechanism has an input end and an output end. The input end is connected to the slidingly arranged grinding blocks 4, and the output end is connected to the top rod 5. When the grinding blocks 4 slide, they can drive the top rod 5 to extend out of the sliding hole and abut against the mounting rod 1.

[0033] The beneficial effects of the drilling reamer provided in this embodiment are as follows: Compared with the prior art, the drilling reamer provided in this embodiment has a grinding block 4 that can slide up and down, and a transmission mechanism with an input end and an output end. The input end is connected to the slidably arranged grinding block 4, and the output end is connected to the top rod 5. When the grinding block 4 is subjected to force and moves downward, the transmission mechanism will drive the top rod 5 to extend outward and abut against the mounting rod 1, making the reamer and the mounting rod 1 more securely fixed. When the pressure on the grinding block 4 is released from the inner hole, the top rod 5 is retracted into the sliding hole by the reset component, reducing the difficulty of disassembling the reamer.

[0034] In this embodiment, the grinding block 4 includes a first grinding block 4 disposed at the top and a second grinding block 4 disposed at the bottom, with the first grinding block 4 slidably disposed. It is worth noting that the grinding blocks 4 are not limited to two sets, but can also be three sets, four sets, or other suitable quantities. Diamond grinding heads are evenly arranged on the surface of the grinding block 4. Furthermore, to facilitate the raising of the drilling reamer, the top of the grinding block 4 is chamfered.

[0035] like Figure 3 and Figure 4As shown, the transmission mechanism includes a slide groove on the body 2 and a transmission medium disposed within the slide groove. The slide groove includes a first vertical groove, a first horizontal groove 608, a second vertical groove 609, and a second horizontal groove 610. The first vertical groove is L-shaped and has a horizontally arranged transverse groove 606 and a vertically arranged vertical groove 607. The first vertical groove is located on the side closest to the inner hole of the body 2. The transverse groove 606 is open to the inner hole of the body 2 and is located at the top of the vertical groove 607. The vertical groove 607 is connected to the end of the transverse groove 606 that is away from the inner hole of the body 2.

[0036] The first horizontal groove 608 is horizontally positioned and connected to the bottom end of the vertical groove 607. The second vertical groove 609 is vertically positioned and located on the side away from the inner hole of the body 2, relative to the first vertical groove. The second vertical groove 609 is connected to the first horizontal groove 608. The second horizontal groove 610 is horizontally positioned, with one end connected to the second vertical groove 609 and the other end communicating with the inner hole of the body 2. The top rod 5 is slidably positioned within the second horizontal groove 610, and the length of the top rod 5 is not greater than the length of the second horizontal groove 610, allowing the top rod 5 to be completely retracted within the second horizontal groove 610 or partially extended to the outside of the second horizontal groove 610.

[0037] like Figure 3 As shown, the sliding grinding block 4 is provided with a pressure block 6. The pressure block 6 is inserted into the first vertical groove, and the bottom end of the pressure block 6 is in contact with the transmission medium. When the first grinding block 4 is pressed down by an external force, the pressure block 6 will press down with the first grinding block 4, pushing the transmission medium to move along the groove. The transmission medium pushes the top rod 5 to slide, thereby pressing the top rod against the mounting rod 1, making the body 2 and the mounting rod 1 more firmly fixed.

[0038] As a preferred embodiment, the pressure block 6 includes a horizontal block 601 and a vertical block 602 arranged perpendicularly to each other. The vertical block 602 is inserted into a portion of the vertical groove 607, and the horizontal block 601 of the pressure block 6 is inserted into the horizontal groove 606. The height of the horizontal groove 606 is greater than the height of the horizontal block 601, so that the horizontal block 601 can slide up and down into the horizontal groove 606, thereby driving the vertical block 602 to slide up and down in the vertical groove 607.

[0039] The transmission medium includes a first transmission rod 603, a second transmission rod 604, and a third transmission rod 605. The first transmission rod 603 is slidably disposed in a vertical groove 607, the second transmission rod 604 is slidably disposed in a first horizontal groove 608, and the third transmission rod 605 is slidably disposed in a second vertical groove 609. The top end of the first transmission rod 603 abuts against the bottom end of the vertical block 602. The bottom end of the first transmission rod 603 is provided with a first inclined surface. One end of the second transmission rod 604 is provided with a second inclined surface, and the other end of the second transmission rod 604 is provided with a third inclined surface. The first inclined surface abuts against the second inclined surface, so that when the first transmission rod 603 slides down, it can push the second transmission rod 604 to slide along the first horizontal groove 608.

[0040] One end of the third transmission rod 605 is provided with a fourth inclined surface, and the other end of the third transmission rod 605 is provided with a fifth inclined surface. The third inclined surface abuts against the fourth inclined surface, so that when the second transmission rod 604 slides toward the third transmission rod 605, it can drive the third transmission rod 605 to slide along the second vertical groove 609, or when the second transmission rod 604 slides toward the first transmission rod 603, it can drive the first transmission rod to slide upward.

[0041] One end of the top rod 5 is provided with a sixth inclined surface, which abuts against the fifth inclined surface. This allows the top rod 5 to slide along the second transverse groove 610 when the third transmission rod 605 slides toward the top rod 5, and also allows the top rod 5 to push the third transmission rod 605 downward when it slides toward the third transmission rod 605.

[0042] That is, when the pressure block 6 slides downward, it pushes the first transmission rod 603 downward, which in turn drives the second transmission rod 604 to slide along the first transverse groove 608, thereby pushing the third transmission rod 605 upward, and finally causing the top rod 5 to extend into the inner hole of the sliding hole. When the reset assembly resets the top rod 5, the top rod 5 pushes the third transmission rod 605 downward, which in turn pushes the second transmission rod 604 to slide towards the first transmission rod 603, and finally causes the first transmission rod 603 to slide upward, so that the first grinding block 4 will also be reset.

[0043] To facilitate the downward sliding of the first transmission rod 603, a first receiving groove 611 is provided below the vertical groove 607. To facilitate the sliding of the second transmission rod 604, a second receiving groove 612 is provided at the end of the second horizontal groove 610 away from the first vertical groove. To facilitate the sliding of the second transmission rod 604 and the third transmission rod 605, a third receiving groove 613 is provided above the second vertical groove 609.

[0044] Of course, in addition to the above scheme, the transmission medium can also be hydraulic oil. In this case, the side wall of the vertical block 602 abuts against the side wall of the vertical groove 607, and the side wall of the top rod 5 abuts against the side wall of the second horizontal groove 610, so that the hydraulic oil cannot leak out from between the side wall of the vertical block 602 and the side wall of the vertical groove 607, nor can it be exposed from between the bottom wall of the top rod 5 and the second horizontal groove 610, thereby facilitating the transmission of pressure of the hydraulic oil to the vertical block 602 or the top rod 5.

[0045] like Figure 3 As shown, in order to facilitate the reset of the top rod 5 when the external force acting on the grinding block 4 is removed, the reset assembly includes a reset groove, which is located on one side of the second transverse groove 610. A first spring is provided in the reset groove, and the first spring is connected to the top rod 5. When the first spring is in its natural state, the top rod 5 is completely retracted into the second transverse groove 610, which facilitates the disassembly of the drilling engineering reamer of the present invention.

[0046] like Figure 3 As shown, the mounting rod 1 is provided with a first slot 614, and the top rod 5 can be partially locked in the first slot 614 due to its extension. The first slot 614, compared with simply using the top rod, can fix the body 2 and the mounting rod 1 more firmly, effectively preventing the drilling reamer of the present invention from falling off.

[0047] like Figure 3 As shown, the locking mechanism 3 includes a locking hole, a locking ball 302, and a locking groove. The locking hole is located on the body 2, and a second spring 301 is installed inside the locking hole. The locking ball 302 is connected to the second spring 301. When the second spring 301 is in its natural state, a portion of the locking ball 302 is located outside the locking hole. The locking groove is located on the mounting rod, and the locking ball 302 is locked into the locking groove, thus fixing the body 2 to the mounting rod 1. When it is necessary to disassemble the body 2 from the mounting rod 1, the body 2 can be pulled out by force, effectively reducing the difficulty of disassembling the drilling reamer.

[0048] like Figure 1 As shown, the two adjacent sets of grinding blocks 4 are arranged in an alternating pattern, effectively improving the reaming ability of the grinding blocks 4. Meanwhile, to facilitate the installation of the main body 2 on the mounting rod 1, multiple limiting blocks are provided on the main body 2, and correspondingly, multiple limiting grooves are formed on the mounting rod 1. When it is necessary to install the drilling reamer on the mounting rod 1, simply align the guide block with the mounting groove and insert it. In this embodiment, there are two limiting blocks; however, the number of limiting blocks can also be one, three, or more, etc.

[0049] The above are merely preferred embodiments of the present invention and are 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 within the protection scope of the present invention.

Claims

1. A drilling tool for drilling operations, used for mounting on a mounting rod to make holes, characterized in that, include: The body (2) is arranged in a cylindrical shape, and multiple sliding holes are arranged along the circumference of the body (2); A snap-fit ​​mechanism (3) is provided between the body (2) and the mounting rod, so that the body (2) and the mounting rod can be detachably connected; Multiple grinding blocks (4) are evenly arranged along the circumference of the body (2). The multiple grinding blocks (4) are divided into multiple groups arranged along the axial direction of the body (2), and the uppermost group of grinding blocks (4) is slidably arranged. A top rod (5) is slidably disposed in the sliding hole. A reset component is provided between the top rod (5) and the body (2). When the reset component is in its natural state, the top rod (5) is retracted into the sliding hole. The transmission mechanism has an input end and an output end. The input end is connected to the slidably arranged grinding block (4), and the output end is connected to the top rod (5). When the grinding block (4) slides, it can drive the top rod (5) to extend out of the sliding hole and abut against the mounting rod (1). The transmission mechanism includes a slide groove on the body (2) and a transmission medium disposed in the slide groove. The slide groove includes a first vertical groove, a first horizontal groove (608), a second vertical groove (609), and a second horizontal groove (610). The first vertical groove is L-shaped and has a horizontally arranged transverse groove (606) and a vertically arranged vertical groove (607). The transverse groove (606) is connected to the inner hole of the body (2) and is located at the top of the vertical groove (607). The first horizontal groove (608) is horizontally arranged and connected to the vertical groove (607). The second vertical groove (609) is vertically arranged. The second vertical groove (609) is connected to the first horizontal groove (608). The second horizontal groove (610) is horizontally set, and one end of the second horizontal groove (610) is connected to the second vertical groove (609). The other end of the second horizontal groove (610) is connected to the inner hole of the body (2). The top rod (5) is slidably set in the second horizontal groove (610). The grinding block (4) is slidably set with a pressure block (6). The pressure block (6) is inserted into the first vertical groove. The pressure block (6) presses down and pushes the transmission medium to move along the slide groove. The transmission medium pushes the top rod (5) to slide. The pressure block (6) includes a horizontal block (601) and a vertical block (602) arranged perpendicularly to each other. The vertical block (602) is inserted into a portion of the vertical groove (607), and the horizontal block (601) of the pressure block (6) is inserted into the horizontal groove (606), and the height of the horizontal groove (606) is greater than the height of the horizontal block (601).

2. The drilling reamer as described in claim 1, characterized in that: The transmission medium includes a first transmission rod (603), a second transmission rod (604), and a third transmission rod (605). The first transmission rod (603) is slidably disposed in the vertical groove (607), the second transmission rod (604) is slidably disposed in the first horizontal groove (608), and the third transmission rod (605) is slidably disposed in the second vertical groove (609). The top end of the first transmission rod (603) abuts against the bottom end of the vertical block (602). The bottom end of the first transmission rod (603) is provided with a first inclined surface. One end of the second transmission rod (604) is provided with a second inclined surface, and the other end of the second transmission rod (604) is provided with a third inclined surface. The first inclined surface and the second inclined surface are connected. The first transmission rod (603) slides down and pushes the second transmission rod (604) to slide along the first transverse groove (608). One end of the third transmission rod (605) is provided with a fourth inclined surface, and the other end of the third transmission rod (605) is provided with a fifth inclined surface. The third inclined surface abuts against the fourth inclined surface, so that when the second transmission rod (604) slides, it can drive the third transmission rod (605) to slide along the second vertical groove (609). One end of the top rod (5) is provided with a sixth inclined surface, and the sixth inclined surface abuts against the fifth inclined surface, so that when the third transmission rod (605) slides, it can drive the top rod (5) to slide along the second transverse groove (610).

3. The drilling reamer as described in claim 2, characterized in that: The vertical groove (607) is provided with a first receiving groove (611) below it, the second horizontal groove (610) is provided with a second receiving groove (612) at the end away from the first vertical groove, and the second vertical groove (609) is provided with a third receiving groove (613) above it.

4. The drilling reamer as described in claim 1, characterized in that: The sidewall of the vertical block (602) abuts against the sidewall of the vertical groove (607), the sidewall of the top rod (5) abuts against the sidewall of the second horizontal groove (610), and the transmission medium includes hydraulic oil.

5. The drilling reamer as described in claim 4, characterized in that: The reset assembly includes a reset groove located on one side of the second transverse groove (610). A first spring is provided in the reset groove and is connected to the top rod (5). When the first spring is in its natural state, the top rod (5) is completely retracted into the second transverse groove (610).

6. The drilling reamer as described in claim 5, characterized in that: The mounting rod (1) is provided with a first slot (614), and the top rod (5) can be partially locked in the first slot (614) due to its extension.

7. The drilling reamer as described in claim 1, characterized in that: The snap-fit ​​mechanism (3) includes a snap-fit ​​hole, a snap-fit ​​ball (302) and a snap-fit ​​groove. The snap-fit ​​hole is provided on the body (2). A second spring (301) is provided in the snap-fit ​​hole. The snap-fit ​​ball (302) is connected to the second spring (301). When the second spring (301) is in its natural state, a portion of the snap-fit ​​ball (302) is located outside the snap-fit ​​hole. The snap-fit ​​groove is provided on the mounting rod. The snap-fit ​​ball (302) is snapped into the snap-fit ​​groove, thereby fixing the body (2) and the mounting rod (1).

8. The drilling reamer as described in claim 1, characterized in that: The two adjacent sets of grinding blocks (4) are arranged alternately.

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