Special reamer device for aero-engine three-stage guide vane and reaming method thereof

Abstract

The present application relates to a special reamer device for aero-engine three-stage guide vane and a reaming method thereof, which is used for reaming the mounting edge of the first-stage and second-stage guide vane shell and the third-stage guide vane shell without disassembling the guide vane, and comprises a positioning mounting base with a positioning hole, the positioning hole is located below the reaming position to vertically guide and position the reamer, an adjusting screw which can vertically upwardly abut against the reamer, and a screw adjusting plate for vertically screwing the adjusting screw, the present application has the beneficial effects that the reaming operation of the mounting edge of the first-stage and second-stage guide vane shell and the third-stage guide vane shell in the assembled state can be realized, the cost can be saved, the efficiency can be improved, and the troubleshooting work process can be accelerated.

Description

Technical Field

[0001] This invention relates to environmental protection treatment equipment, specifically to a reaming device and reaming method for a third-stage guideway of an aero-engine. Background Technology

[0002] When a Russian-made aircraft engine malfunctions during testing or use after repair, troubleshooting is necessary. Due to the engine's structure, after analyzing the cause of the malfunction, if it's required to check the coaxiality of the first and second stage guide vanes and the third stage guide vane housing, and to eliminate any coaxiality errors, to save costs, improve efficiency, and expedite the troubleshooting process, the first and second stage guide vane and the third stage guide vane housing are not disassembled. Instead, they are repositioned while still assembled. Since the coaxiality is determined by the 60 bolts on the mounting edge, 6-10 mounting holes on the mounting edge are selected as positioning holes to adjust the coaxiality. However, because the original positioning holes have become misaligned after adjustment, the selected mounting holes need to be enlarged, and the positioning holes need to be redefined.

[0003] In the assembled state, conventional methods cannot be used to perform reaming operations on the mounting edges of the first- and second-stage guides and the third-stage guide housing. Therefore, a special reaming device for the third-stage guide of an aero-engine is designed to achieve reaming of the mounting edges of the first- and second-stage guides and the third-stage guide housing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a special reaming device and method for the third-stage guide vane of an aero-engine. It can perform reaming operations on the mounting edges of the first-stage and second-stage guide vane housings and the third-stage guide vane housing in the assembled state, so as to ensure that the relative positions of the first-stage and second-stage guide vane housings and the third-stage guide vane housing are fixed after the coaxiality of the first-stage and second-stage guide vane housings is adjusted, and to ensure that the coaxiality after adjustment will not shift again. Moreover, the third-stage guide vane housing is not disassembled during reaming, which can save costs, improve efficiency, and speed up the troubleshooting process.

[0005] The objective of this invention is achieved through the following technical solution: A special reaming device for aero-engine third-stage guide vanes is used to perform reaming operations on the mounting edges of the first- and second-stage guide vane housings and the third-stage guide vane housing without disassembling the guide vanes. It includes: a positioning mounting base with a positioning hole located below the hole to be reamed for vertical guiding and positioning of the reamer; an adjusting screw that can vertically push the reamer upwards; and a screw adjustment plate for vertically screwing the adjusting screw.

[0006] When designing a reamer for reaming in an aero-engine, since the engine is in the assembled state, the reamer can only ream from the mounting edge of the first and second stage guide housings towards the mounting edge of the third stage guide housing. The reamer reams from bottom to top, and due to gravity, the reamer tends to move downwards. Therefore, this solution designs an adjusting screw, which restricts the downward sliding of the reamer by axial movement during the reaming process when the wrench rotates the reamer.

[0007] The device in this scheme is fixed on the mating surface of the first and second stage guide housings and the third stage guide housing. Because the reaming hole has a small allowance, the guide is constructed by using the positioning mounting base. This allows the reaming hole to be pre-drilled on the mounting edge to position the reamer, ensuring sufficient reaming hole allowance and that the hole after reaming is a complete hole.

[0008] In a preferred embodiment of this solution, the adjusting screw is vertically screwed onto one end of the screw adjusting plate through the adjusting screw hole, and the other end of the screw adjusting plate is installed below the positioning mounting base through a transverse rotating joint so that the screw adjusting plate can be rotated laterally to exit below the mounting edge hinge hole. The dedicated reaming device also includes a rotating pair locking mechanism for locking the screw adjustment plate. When the screw adjustment plate rotates around the axis of the rotating pair to below the positioning hole, the screw adjustment plate can be locked and fixed by the rotating pair locking mechanism.

[0009] Due to space limitations, if the adjusting screw is placed directly below the positioning hole, the reamer cannot be installed. Therefore, this solution installs the screw adjusting plate below the positioning mounting base via a transverse rotating joint, so as to allow for operating space when the reamer is installed.

[0010] In a preferred embodiment of this solution, the rotary joint locking mechanism includes a locking screw; a column is provided below the positioning mounting base, and a threaded hole is provided vertically at the bottom of the column; the other end of the screw adjustment plate is fitted onto the locking screw to form a transverse rotary joint, and the top end of the locking screw is screwed into the threaded hole. When the locking screw is tightened upward, the screw adjustment plate can be pressed and locked against the bottom of the column to form the rotary joint locking mechanism.

[0011] In a preferred embodiment of this solution, the bottom of the reamer is provided with a hexagonal reamer, and the top of the adjusting screw is provided with a hexagonal groove that matches the bottom of the hexagonal reamer. The adjusting screw can be fitted upwards onto the bottom of the hexagonal reamer and abut against the bottom of the reamer. The special reaming device also includes a wrench, the head of which cooperates with the hexagonal reamer.

[0012] The reamer connects to the top of the adjusting screw via the reamer hexagon, so that when the reamer is turned with a wrench, the adjusting screw can rotate synchronously, ensuring that the adjusting screw always presses upward against the bottom of the reamer and restricts the reamer from sliding downward.

[0013] In a preferred embodiment of this solution, the column is vertically positioned at the bottom of the positioning mounting base and is an integral part of the positioning mounting base; the distance from the adjusting screw hole to the center axis of the locking screw is equal to the distance from the positioning hole to the center axis of the locking screw. This facilitates accurate alignment between the adjusting screw and the reamer.

[0014] In a preferred embodiment of this solution, the dedicated reaming device is further equipped with a guide rod; the upper end of the guide rod can be simultaneously inserted into the reaming holes on the mounting edges of the first- and second-stage guide housings and the third-stage guide housing via positioning holes on the mounting base. This enables radial positioning of the first- and second-stage guide housings and the third-stage guide housing, ensuring the accuracy of the reaming.

[0015] In a preferred embodiment of this solution, the guide rod is stepped, and the upper diameter of the guide rod is smaller than the lower diameter. The stepped guide rod is simultaneously inserted into the reamed holes on the sides of the first- and second-stage guide housings and the third-stage guide housing through the positioning holes on the mounting and positioning seat, so as to radially position the first- and second-stage guide housings and the third-stage guide housing.

[0016] In a preferred embodiment of this solution, the positioning mounting base is provided with a mounting hole on each side; the mounting hole is a waist-shaped hole, and the two mounting holes correspond to the two adjacent holes on the left and right sides of the hole to be reamed; the positioning mounting base can be fixedly installed below the mounting edge through the two adjacent holes and by anti-rotation bolts and nuts.

[0017] During installation, first remove the mounting bolts on the hole to be reamed and the bolts on the two adjacent holes on the left and right sides. After accurately positioning with the guide rod, the positioning seat can be fixed by using the two adjacent bolt holes and special anti-rotation bolts and nuts.

[0018] In a preferred embodiment of this solution, the locking screw includes a locking shank and a locking head; an abutment is further provided between the locking shank and the locking head, and the outer wall of the locking head is provided with a textured surface. This facilitates the rotation of the locking screw.

[0019] This solution also provides a method for reaming a third-stage guide of an aero-engine using a dedicated reaming device. The dedicated reaming device includes a positioning mounting base with a positioning hole located below the hole to be reamed for vertically guiding and positioning the reamer; an adjusting screw that can vertically push the reamer upward; and a screw adjustment plate for vertically screwing the adjusting screw. The boring method includes the following steps: Step A: Place the positioning seat below the mounting edge of the first and second stage guide housings and the third stage guide housing, so that the positioning holes are aligned with the reamed holes; Step B: Insert the reamer into the positioning hole and rotate the adjusting screw until the adjusting screw presses against the bottom surface of the reamer. Step C: Use a wrench to turn the reamer to ream the mounting edge. While reaming, simultaneously turn the adjusting screw upwards to prevent the reamer from sliding downwards.

[0020] In a preferred embodiment of this solution, the adjusting screw is vertically screwed onto one end of the screw adjusting plate through the adjusting screw hole, and the other end of the screw adjusting plate is installed below the positioning mounting base through a transverse rotating joint so that the screw adjusting plate can be rotated laterally to exit below the mounting edge hinge hole. The dedicated reaming device also includes a rotating pair locking mechanism for locking the screw adjustment plate. When the screw adjustment plate rotates around the axis of the rotating pair to below the positioning hole, the screw adjustment plate can be locked and fixed by the rotating pair locking mechanism. Step B specifically refers to: Ensure the screw adjustment plate is located below and outside the mounting edge, insert the reamer into the positioning hole, and then rotate the screw adjustment plate to adjust the adjusting screw to be below the reamer; The locking screw adjustment plate is locked by rotating the secondary locking mechanism, and then the adjusting screw is rotated until it presses against the bottom surface of the reamer.

[0021] In a preferred embodiment of this solution, the rotating pair locking mechanism includes a locking screw; A column is provided below the positioning mounting base, and a threaded hole is provided vertically at the bottom of the column; The other end of the screw adjustment plate is fitted onto the locking screw to form a transverse rotating pair. The top of the locking screw is screwed into the threaded hole. When the locking screw is tightened upwards, the screw adjustment plate can be pressed and locked against the bottom of the column to form a rotating pair locking mechanism. Furthermore, the bottom of the reamer is provided with a hexagonal reamer, and the top of the adjusting screw is provided with a hexagonal groove that matches the bottom of the hexagonal reamer. The adjusting screw can be fitted upwards onto the bottom of the hexagonal reamer and abut against the bottom of the reamer. The special reaming device also includes a wrench, the head of which fits into the hexagon of the reamer. Step B is further specified as follows: Make sure the screw adjustment plate is located below the outer edge of the mounting edge, insert the reamer into the positioning hole, and then rotate the screw adjustment plate to adjust the adjusting screw to be below the reamer; Adjust the screw plate upwards so that the bottom of the reamer engages in the hexagonal slot, and tighten the locking screw upwards to lock the screw plate. Then rotate the adjusting screw until it presses against the bottom surface of the reamer; Step C specifically includes: Use a wrench to operate the reamer to ream the mounting edge. While reaming, the adjusting screw can automatically move upward to prevent the reamer from sliding downward.

[0022] In a preferred embodiment of this solution, the dedicated reaming device is also equipped with a guide rod; the upper end of the guide rod can be simultaneously inserted into the reaming holes on the mounting edges of the first- and second-stage guide housings and the third-stage guide housing through the positioning holes on the mounting base; the positioning mounting base has a mounting hole on each side; the mounting holes are oblong holes, and the two mounting holes correspond to the two adjacent holes on the left and right sides of the reaming hole; the positioning mounting base can be fixedly installed below the mounting edge through the two adjacent holes and by anti-rotation bolts and nuts; Step A specifically involves: Place the mounting base below the mounting edge, insert the guide rod into the mounting hole, and simultaneously insert the upper end of the guide rod into the holes to be reamed on the mounting edges of the first- and second-stage guide housings and the third-stage guide housing to determine the position of the holes to be reamed; use anti-rotation bolts and nuts to fix the positioning mounting base to the mounting edge so that the positioning hole is aligned with the hole to be reamed.

[0023] The beneficial effects of this invention are: (1) In the assembled state, conventional methods cannot be used to ream the mounting edges of the first and second stage guides and the third stage guide housing. Therefore, this solution designs a special reaming device that allows the reamer to ream from the mounting edge of the first and second stage guide housing towards the mounting edge of the third stage guide housing (i.e., reaming from below the mounting edge of the first and second stage guides and the third stage guide housing upwards), so as to realize reaming of the mounting edges in the assembled state: Achieving bottom-up reaming requires overcoming challenges such as the downward force of gravity on the reamer, space limitations, and reaming accuracy. Therefore: This invention designs a positioning mounting base with positioning holes. The positioning mounting base forms a guide, and the hole to be reamed can be pre-drilled on the mounting edge to position and guide the reamer, ensuring that the reaming hole has sufficient allowance and the hole after reaming is a complete hole. The invention also includes a stepped guide rod, which is inserted into the reamed holes on the sides of the first- and second-stage guide housings and the third-stage guide housing via positioning holes on the mounting base. This allows for radial positioning of the first- and second-stage guide housings and the third-stage guide housing, ensuring the accuracy of the reamed holes. During installation, the guide rod first positions the reamed holes, and then the mounting base is fixed using bolt holes adjacent to the reamed holes and special anti-rotation bolts and nuts. More importantly, this solution also includes an adjusting screw. During the reaming process, the axial movement of the adjusting screw restricts the downward sliding of the reamer under the action of gravity. In addition, due to space constraints, the adjusting screw must be cleared when installing the positioning seat, using the guide rod, and inserting the reamer. Therefore, this solution also includes a rotatable screw adjusting plate for installing the adjusting screw. During the process of inserting the guide rod or reamer into the positioning hole, the screw adjusting plate rotates outward to make room. After inserting the reamer, the adjusting screw is rotated to the bottom of the reamer to provide support for the reamer and prevent it from sliding down. (2) In this scheme, the top of the adjusting screw is always pressed against the bottom of the reamer to ensure that the reamer can stably ream the hole upward. The reamer has a hexagonal design at the bottom and a hexagonal groove at the top of the adjusting screw. After inserting the reamer into the positioning hole, rotate and move the screw adjusting plate upward to fit the adjusting screw into the bottom of the hexagonal reamer. Then lock the screw adjusting plate and rotate the adjusting screw until the bottom of the hexagonal groove is against the bottom surface of the reamer. Finally, the reamer hole can be rotated using a wrench. Because the reamer and the adjusting screw are connected by a hexagonal structure, the adjusting screw can automatically rotate synchronously during the rotation of the reamer to ensure that the adjusting screw is always against the bottom of the reamer and to prevent the reamer from sliding downward. In summary (1) and (2), this solution can effectively realize the reaming operation of the mounting edges of the first and second stage guides and the third stage guide housing in the assembled state. Therefore, this device does not disassemble the third stage guide housing when reaming, which can save costs, improve efficiency, speed up the troubleshooting process, and improve the support capability for military training. It is suitable for use at the troubleshooting site of aero-engines. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention; Figure 3 This is a schematic cross-sectional view of part of the present invention; Figure 4 This is a schematic diagram of the positioning mounting base of the present invention; Figure 5 This is a schematic cross-sectional view of the positioning mounting base of the present invention; Figure 6 This is a schematic diagram of the adjusting screw of the present invention; Figure 7 This is a schematic diagram of the locking screw of the present invention; Figure 8 This is a schematic diagram of the adjustment plate of the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0026] like Figures 1-4 ,as well as Figure 8As shown, the special reaming device for the third-stage guide of an aero-engine includes a positioning mounting base 7, an adjusting screw 5, a screw adjusting plate 4, and a reamer 6. The positioning mounting base 7 can be installed below the mounting edge 1 between the first and second stage guide housings a and the third stage guide housing b. The positioning mounting base 7 has a vertically arranged positioning hole 701, which is vertically aligned with the hole to be reamed on the mounting edge 1. The reamer 6 can pass through the positioning hole 701 from below to the top to achieve reaming of the mounting edge 1. After the top of the adjusting screw 5 is screwed upward to the screw adjusting plate 4, it can abut against the bottom of the reamer 6. Thus, the axial movement of the adjusting screw 5 restricts the downward sliding of the reamer, which can achieve reaming of the hole from bottom to top by the reamer 6.

[0027] In this embodiment, a stepped guide rod 11 is also designed. The guide rod 11 is inserted into the reamed holes on the sides of the first and second stage guide housings a and the third stage guide housing b through the positioning holes on the mounting and positioning seat 7, so as to radially position the first and second stage guide housings a and the third stage guide housing b.

[0028] Due to space constraints, the adjusting screw 5 must be cleared when the guide rod 11 is used to install the positioning seat 7 and when the reamer 6 is inserted. Therefore, in this solution, a locking screw 3 is designed, and the screw adjusting plate 4 is fitted onto the locking screw 3 to form a transverse rotating pair that can rotate laterally. Thus, when the reamer 6 is inserted, the adjusting screw 5 can be cleared from below the hole to be reamed.

[0029] For details, please refer to Figure 4 , Figure 5 As shown, in this embodiment, a column 702 is provided below the positioning mounting base 7. The column 702 and the positioning mounting base 7 are an integral structure. A threaded hole 7021 is provided at the bottom of the column 702. The screw adjustment plate 4 is fitted onto the locking screw 3, and the top of the locking screw 3 is screwed into the threaded hole 7021. Thus, the screw adjustment plate 4 can be rotated around the axis of the locking screw 3 to allow for the use of the guide rod 11 and the insertion of the reamer 6. After the reamer 6 is inserted into the positioning hole 701, the screw adjustment plate 4 is rotated to a position below the reamer 6, and the locking screw 3 is tightened upwards. This will press and lock the screw adjustment plate 4 against the bottom of the column 702 to form a locking mechanism of the rotating pair, thus completing the assembly and fixation of the device in this scheme.

[0030] The reamer 6 is usually equipped with a hexagonal reamer to facilitate the use of the wrench 2 to rotate the special reamer 6 to achieve reaming. In this solution, the wrench 2 used is a double-ended wrench, and the hexagonal reamer is located at the bottom of the reamer.

[0031] refer to Figure 1 , Figure 6As shown, in this embodiment, the top of the adjusting screw 5 is provided with a hexagonal slot 501 that is adapted to the bottom of the hexagonal reamer. By moving the adjusting screw 5 upward, the hexagonal slot 501 can be fitted onto the bottom of the reamer 6, and the bottom of the hexagonal slot 501 presses against the bottom surface of the hexagonal reamer upward. Thus, when the wrench 2 rotates the hexagonal reamer, the adjusting screw 5 can move upward synchronously due to the cooperation of the hexagonal structure, so that the adjusting screw 5 always abuts against the reamer 6 during the upward reaming process, preventing the reamer 6 from sliding down.

[0032] refer to Figure 1 , Figure 2 , Figure 4 As shown, further, in this solution, in order to achieve the fixed installation of the positioning mounting base 7, a mounting hole 703 is provided on each of the two sides of the positioning mounting base 7; the mounting hole 703 is a waist-shaped hole, and the two mounting holes correspond to the two adjacent holes on the left and right sides of the hole to be reamed; thus, the positioning mounting base 7 can be fixedly installed below the mounting side 1 through the two adjacent holes and via the anti-rotation bolt 9 and nut 8.

[0033] refer to Figure 7 As shown, in this embodiment, the locking screw 3 includes a locking screw rod and a locking screw head; an abutment platform is also provided between the locking screw rod and the locking screw head, and the outer wall of the locking screw head is provided with a mesh pattern.

[0034] Working principle explanation: When using the special reaming device for the third-stage guide of an aero-engine involved in this invention, first remove the bolts at the specified reaming hole positions on the third-stage guide housing, and then remove the adjacent bolts on its left and right sides; loosen the locking screws, turn the screw adjustment plate 4 to the outside of the housing, leaving operating space for the guide rod 11; place the positioning mounting seat 7 below the housing mounting edge, insert the guide rod 11, and simultaneously insert the upper end of the guide rod 11 into the reaming holes on the mounting edges 1 of the first-stage and second-stage guide housings a and the third-stage guide housing b. After determining the position of the reaming hole, use the anti-rotation bolt 9 and nut 8 to fix the positioning mounting seat 7 to the housing; remove the guide rod 11, insert the special reamer 6, and rotate the screw... Install the adjusting plate 4 until the adjusting screw 5 is below the reamer 6. Move the adjusting plate 4 upwards so that the bottom end of the reamer 6 is engaged in the hexagonal slot 501. Rotate the locking screw 3 to tighten the adjusting plate 4. Rotate the adjusting screw 5 until it presses against the bottom surface of the reamer 6. Insert the double-ended wrench 2 into the hexagonal slot of the reamer and turn the double-ended wrench 2 to ream the mounting edges 1 of the first and second stage guide housings a and the third stage guide housing b. During the reaming process, rotate the adjusting screw 5 as the reamer 6 progresses to ensure that the bottom surface of the reamer 6 maintains a small gap or is in constant contact with the adjusting screw 5 until the entire reaming work of the mounting edges 1 of the first and second stage guide housings a and the third stage guide housing b is completed.

[0035] The above are merely preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be modified within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A reaming device for a third-stage guideway of an aircraft engine, used for reaming the mounting edges (1) of the first and second stage guideway housings (a) and the third stage guideway housing (b) without disassembling the guideway, characterized in that... include: A positioning mounting base (7) with a positioning hole (701) located below the reaming hole to vertically guide and position the reamer (6); An adjusting screw (5) that can hold the reamer (6) vertically upward; A screw adjustment plate (4) for vertically screwed adjusting screws (5); The adjusting screw (5) is vertically screwed into one end of the screw adjusting plate (4) through the adjusting screw hole. The other end of the screw adjusting plate (4) is installed below the positioning mounting base (7) through a transverse rotating joint so that the screw adjusting plate (4) can be rotated laterally to exit below the hinge hole of the mounting edge (1). The special reaming device also includes a rotating pair locking mechanism for locking the screw adjustment plate (4). When the screw adjustment plate (4) rotates around the axis of the rotating pair to below the positioning hole (701), the screw adjustment plate (4) can be locked and fixed by the rotating pair locking mechanism. The rotating pair locking mechanism includes a locking screw (3); A column (702) is provided below the positioning mounting base (7), and a threaded hole (7021) is provided vertically at the bottom of the column (702). The other end of the screw adjustment plate (4) is fitted onto the locking screw (3) to form a transverse rotating pair. The top of the locking screw (3) is screwed into the threaded hole (7021). When the locking screw (3) is tightened upward, the screw adjustment plate (4) can be pressed and locked against the bottom of the column (702) to form a rotating pair locking mechanism. The bottom of the reamer (6) is provided with a reamer hexagon, and the top of the adjusting screw (5) is provided with a hexagonal slot (501) that is adapted to the bottom of the reamer hexagon. The adjusting screw (5) can be fitted upwards onto the bottom of the reamer hexagon. The special reaming device also includes a wrench (2), the head of which is hexagonal with the reamer; The column (702) is vertically arranged at the bottom of the positioning mounting base (7) and is an integral structure with the positioning mounting base (7); The distance from the adjusting screw hole to the center axis of the locking screw (3) is equal to the distance from the positioning hole (701) to the center axis of the locking screw (3); The special reaming device is also equipped with a guide rod (11). The upper end of the guide rod (11) can be simultaneously inserted into the reamed holes on the mounting edges (1) of the first and second stage guide housings (a) and the third stage guide housing (b) through the positioning hole (701) on the positioning mounting base (7); The positioning mounting base (7) is provided with a mounting hole (703) on each side; The mounting hole (703) is a waist-shaped hole. The two mounting holes (703) correspond to the two adjacent holes on the left and right sides of the hole to be reamed. The positioning mounting seat (7) can be fixedly installed below the mounting side (1) through the two adjacent holes and via the anti-rotation bolt (9) and nut (8).

2. A method for reaming a third-stage guide of an aero-engine using a dedicated reaming device, characterized in that: The dedicated reaming device includes a positioning mounting base (7) with a positioning hole (701) located below the hole to be reamed for vertically guiding and positioning the reamer (6); an adjusting screw (5) that can vertically push the reamer (6) upward; and a screw adjustment plate (4) for vertically screwing the adjusting screw (5). The boring method includes the following steps: Step A: Place the positioning mounting base (7) below the mounting edge (1) of the first and second stage guide housings (a) and the third stage guide housing (b), so that the positioning hole (701) is aligned with the hole to be reamed; Step B: Insert the reamer (6) into the positioning hole (701) and rotate the adjusting screw (5) until the adjusting screw (5) presses against the bottom surface of the reamer (6); Step C: Use a wrench to turn the reamer (6) to ream the mounting edge (1). At the same time, turn the adjusting screw (5) upward to restrict the reamer (6) from sliding downward. The adjusting screw (5) is vertically screwed into one end of the screw adjusting plate (4) through the adjusting screw hole. The other end of the screw adjusting plate (4) is installed below the positioning mounting base (7) through a transverse rotating joint so that the screw adjusting plate (4) can be rotated laterally to exit below the hinge hole of the mounting edge (1). The special reaming device also includes a rotating pair locking mechanism for locking the screw adjustment plate (4). When the screw adjustment plate (4) rotates around the axis of the rotating pair to below the positioning hole (701), the screw adjustment plate (4) can be locked and fixed by the rotating pair locking mechanism. Step B specifically refers to: Make sure the screw adjustment plate (4) is located on the outside of the mounting edge (1), insert the reamer (6) into the positioning hole (701), and then rotate the screw adjustment plate (4) to adjust the adjusting screw (5) below the reamer (6); By rotating the secondary locking mechanism to lock the screw adjustment plate (4), and then rotating the adjustment screw (5) until the adjustment screw (5) presses against the bottom surface of the reamer (6); The rotating pair locking mechanism includes a locking screw (3); A column (702) is provided below the positioning mounting base (7), and a threaded hole (7021) is provided vertically at the bottom of the column (702). The other end of the screw adjustment plate (4) is fitted onto the locking screw (3) to form a transverse rotating pair. The top of the locking screw (3) is screwed into the threaded hole (7021). When the locking screw (3) is tightened upward, the screw adjustment plate (4) can be pressed and locked against the bottom of the column (702) to form a rotating pair locking mechanism. Furthermore, the bottom of the reamer (6) is provided with a reamer hexagon, and the top of the adjusting screw (5) is provided with a hexagonal slot (501) that is compatible with the bottom of the reamer hexagon. The adjusting screw (5) can be fitted upwards onto the bottom of the reamer hexagon and abut against the bottom of the reamer (6). The special reaming device also includes a wrench (2), the head of which is hexagonal with the reamer; Step B is further specified as follows: Make sure the screw adjustment plate (4) is located on the outside of the mounting edge (1), insert the reamer (6) into the positioning hole (701), and then rotate the screw adjustment plate (4) to adjust the adjusting screw (5) to be below the reamer (6); Adjust the screw adjustment plate (4) upward so that the bottom end of the reamer (6) is inserted into the hexagonal slot (501), and tighten the locking screw (3) upward to lock the screw adjustment plate (4). Then rotate the adjusting screw (5) until the adjusting screw (5) presses against the bottom surface of the reamer (6); Step C specifically includes: Using a wrench (2), the reamer (6) is turned to ream the mounting edge (1). While reaming, the adjusting screw (5) can automatically move upward to limit the downward sliding of the reamer (6).

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