A portable replaceable cutting edge reamer and method of use

Abstract

This invention relates to the field of production equipment technology, specifically to a portable replaceable cutting edge reamer and its usage method. It includes an outer clamping handle, with an inner holding handle slidably connected to the inner wall of the outer clamping handle. One end of the inner holding handle is threaded with a threaded plug, and the other end is threaded with a connecting end. A cutting head is disposed inside the inner holding handle. The end of the inner holding handle near the threaded plug extends beyond the outer clamping handle, and the end of the inner holding handle extending beyond the outer clamping handle is threaded with a threaded mounting seat. This invention features a single handle with multiple cutting heads, effectively reducing purchase costs and facilitating portability. When not in use, the cutting head can be placed inside the inner holding handle, facilitating storage and reducing damage caused by exposed cutting heads. It also prevents accidental injury and provides good performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of production equipment, in particular to a portable replaceable cutting edge reamer and a using method thereof. BACKGROUND

[0002] At present, the reamer is a rotary cutter with one or more cutting teeth to remove a thin layer of metal from the surface of a machined hole. The reamer is a rotary finishing cutter with straight or helical blades, used for reaming or repairing holes. The reamer has higher machining precision requirements than the drill bit due to the small amount of cutting, and can be manually operated or installed on a drill press for work.

[0003] The existing reamer is of a one-piece structure, which is inconvenient to replace the blade. Different types and sizes of holes require different reamers, which is troublesome to use and increases the burden of carrying. Therefore, we propose a portable replaceable cutting edge reamer and a using method thereof. SUMMARY

[0004] In order to solve the problem of complex installation between the alarm and the computer case, the purpose of the present application is to provide a portable replaceable cutting edge reamer and a using method thereof to solve the above problems.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A portable replaceable cutting edge reamer and a using method thereof, comprising an outer clamping tool holder, the inner wall of the outer clamping tool holder is slidably connected with an inner placed tool holder, one end surface of the inner placed tool holder is threadedly connected with a threaded plug, the other end surface is threadedly connected with a connecting end, the inner placed tool holder is internally provided with a tool bit, the end of the inner placed tool holder close to the threaded plug penetrates out of the outer part of the outer clamping tool holder, the end surface of the inner placed tool holder penetrating out of the outer part of the outer clamping tool holder is threadedly connected with a threaded mounting seat, the surface of the threaded mounting seat is rotatably connected with a threaded sleeve, and the end of the threaded sleeve away from the surface of the threaded mounting seat is threadedly connected with one end of the outer clamping tool holder.

[0007] As a preferred scheme of the present application, the outer clamping tool holder comprises an outer rod body, a first threaded part, a through slot, a first cavity, a second cavity, a first limiting sliding groove and a first limiting protruding strip, the first cavity and the second cavity are arranged in the inner part of the outer clamping tool holder and are connected, the inner diameter size of the first cavity is larger than that of the second cavity, the first threaded part is integrally formed on the left end surface of the outer rod body and is connected with the inner part of the first cavity, the through slot is integrally formed on the right end surface of the outer rod body and is connected with the inner part of the second cavity, the first threaded part is threadedly connected with the inner wall of the threaded sleeve, the first limiting sliding grooves are uniformly arranged in the inner wall of the first threaded part and the first cavity and correspond in position, and the first limiting protruding strips are uniformly arranged in the inner wall of the second cavity.

[0008] As a preferred embodiment of the present invention, the inner placement handle includes an inner rod body, a second threaded portion, a second limiting protrusion, a countersunk hole, a fixing bolt, a third limiting protrusion, and a third threaded portion. The inner rod body is slidably connected to the inner wall of the outer clamping handle. The second threaded portion, the second limiting protrusion, and the countersunk hole are sequentially arranged on the outer surface of the inner rod body from left to right. The threaded mounting seat is threadedly connected to the second threaded portion. The second limiting protrusion corresponds to the position of the first limiting groove and is slidably connected to the inner wall of the first limiting groove. The countersunk hole corresponds to the second chamber. The fixing bolt is threadedly connected to the inner wall of the countersunk hole. One end of the fixing bolt penetrates into the interior of the inner rod body. The inner placement handle has a placement cavity. The third limiting protrusion is evenly distributed on the inner wall of the placement cavity. Both ends of the inner placement handle are provided with a third threaded portion, which communicates with the interior of the placement cavity. The threaded plug and the connecting end are both threadedly connected to the third threaded portion.

[0009] As a preferred embodiment of the present invention, the threaded plug includes a threaded end cap and a rubber seat. The threaded end cap is threadedly connected to a third threaded portion disposed at the left end of the inner placement of the knife handle. The rubber seat is snapped and fixed on the surface of the threaded end cap and contacts one end of the knife head. A cross groove is formed on the outer surface of the threaded plug, and the outer surface of the threaded plug is on the same plane as the left end face of the inner placement of the knife handle.

[0010] As a preferred embodiment of the present invention, the connecting end includes a threaded ring seat, a connecting shaft, a fixing hole, a stepped column, a positioning groove, and an elastic snap-fit ​​mechanism. The threaded ring seat is threadedly connected to the third threaded part located at the right end of the inner placement tool holder. The connecting shaft is integrally formed on the left end face of the threaded ring seat and slidably connected to the inner wall of the inner placement tool holder. The fixing hole is opened on the surface of the connecting shaft and corresponds to the countersunk hole position. One end of the fixing bolt penetrates into the interior of the inner rod body and is threadedly connected to the inner wall of the fixing hole. The right end face of the threaded ring seat is on the same plane as the right end face of the inner placement tool holder. The stepped column is integrally formed on the right end face of the threaded ring seat. The positioning groove is symmetrically opened on the surface of the stepped column. The elastic snap-fit ​​mechanism is symmetrically opened on the surface of the stepped column and is offset from the positioning groove.

[0011] As a preferred embodiment of the present invention, the elastic locking mechanism includes a cylinder, a locking rod, and a spring. The cylinder is threadedly connected to the inner wall of the stepped column, the locking rod is slidably connected to the inner wall of the cylinder and fixedly connected to the inner wall of the cylinder with a spring, and one end of the locking rod extends through the outside of the cylinder and is locked and fixedly engaged with a locking hole opened on the inner wall of the cutter head.

[0012] As a preferred embodiment of the present invention, the cutter head is sleeved on the outside of the stepped column. The cutter head includes a cutter end, a second limiting groove, and a cutter body. The second limiting groove is evenly opened on the outer surface of the cutter end. The cutter body is integrally formed on the right end face of the cutter end. A placement slot is opened on the left end face of the cutter end. The placement slot is adapted to the outer dimensions of the stepped column. Positioning strips are provided at the corresponding positions of the placement slot and the positioning groove. The locking holes for engaging and fixing with the elastic locking mechanism are all provided on the inner wall of the placement slot. The second limiting groove is respectively aligned with the positions of the first limiting protrusion and the third limiting protrusion and is slidably connected.

[0013] As a preferred embodiment of the present invention, the cutting head is configured as three groups, the outer diameter of the cutting head in the three groups gradually decreases, the through groove is adapted to the outer diameter of the group of cutting heads with the largest outer diameter, and the outer surfaces of the threaded mounting seat, the threaded sleeve and the outer clamping handle are all on the same plane.

[0014] A method for using a portable, replaceable-cutting-edge reamer includes the following steps:

[0015] S1: Tighten the threaded sleeve to separate one end of the outer clamping tool holder from the threaded sleeve;

[0016] S2: After removing the external clamping handle, remove the threaded plug and take out the cutting head from inside the internally placed handle;

[0017] S3: After the cutter head is taken out, select the appropriate cutter head size according to the usage requirements and install it on the connecting end. After installation, put the remaining cutter head into the inner tool holder and then install the threaded plug.

[0018] S4: After the threaded plug is installed, the outer clamping handle is placed on the outside of the inner clamping handle, and then one end of it is reconnected and fixed to the threaded sleeve. The installed cutter head then passes through the through groove at the right end of the outer clamping handle.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this invention, when the blade is not in use, it can be placed inside the inner handle, which facilitates storage, reduces damage caused by the blade being exposed, and also prevents accidental injury to personnel, resulting in good performance.

[0021] 2. In this invention, a single handle is combined with multiple blades, which effectively reduces the purchase cost, is easy to carry, eliminates the need for a toolbox, and provides good performance.

[0022] 3. In this invention, an external clamping tool holder, a threaded mounting base, and a threaded sleeve are provided. The outer surfaces of the external clamping tool holder, the threaded mounting base, and the threaded sleeve are all on the same plane, and the connection between the external clamping tool holder and the threaded sleeve is located on the side of the external clamping tool holder away from the installed tool head. This design facilitates clamping by the fixture while ensuring that the clamping position is staggered from the connection point, preventing the external clamping tool holder from separating from the threaded sleeve, resulting in good performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the threaded sleeve structure in this invention;

[0025] Figure 3 This is a schematic diagram of the external clamping handle structure in this invention;

[0026] Figure 4 This is a schematic diagram of the internally placed knife handle structure in this invention;

[0027] Figure 5 This is a schematic diagram of the connection end structure in this invention;

[0028] Figure 6 This is a schematic diagram of the elastic snap-fit ​​mechanism in this invention;

[0029] Figure 7 This is a schematic diagram of the cutter head structure in this invention;

[0030] Figure 8 This is a schematic diagram of the threaded plug structure in this invention.

[0031] In the diagram: 1. External clamping handle; 2. Internal placement of the handle; 3. Threaded plug; 4. Connecting end; 5. Cutting head; 6. Threaded mounting seat; 7. Threaded sleeve; 11. Outer rod body; 12. First threaded section; 13. Through groove; 14. First chamber; 15. Second chamber; 16. First limiting groove; 17. First limiting protrusion; 21. Inner rod body; 22. Second threaded section; 23. Second limiting protrusion; 24. Countersunk hole; 25. Fixing bolt; 26. Third limiting protrusion; 27. Third threaded section; 31. Threaded end cap; 32. Rubber seat; 41. Threaded ring seat; 42. Connecting shaft; 43. Fixing hole; 44. Stepped column; 45. Positioning groove; 46. Elastic snap-fit ​​mechanism; 461. Column; 462. Clamping rod; 463. Spring; 51. Cutting head; 52. Second limiting groove; 53. Cutting body. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] A portable interchangeable cutting edge reamer includes an outer clamping handle 1, an inner holding handle 2 slidably connected to the inner wall of the outer clamping handle 1, a threaded plug 3 threadedly connected to one end of the inner holding handle 2, a connecting end 4 threadedly connected to the other end of the inner holding handle 2, a cutting head 5 disposed inside the inner holding handle 2, one end of the inner holding handle 2 near the threaded plug 3 extending through the outside of the outer clamping handle 1, a threaded mounting seat 6 threadedly connected to the other end of the inner holding handle 2 extending through the outside of the outer clamping handle 1, a threaded sleeve 7 rotatably connected to the surface of the threaded mounting seat 6, and one end of the threaded sleeve 7 away from the surface of the threaded mounting seat 6 threadedly connected to one end of the outer clamping handle 1.

[0034] Example: Figures 1-8 As shown, in some embodiments, the external clamping handle 1 includes an outer rod body 11, a first threaded portion 12, a through groove 13, a first chamber 14, a second chamber 15, a first limiting groove 16, and a first limiting protrusion 17. The first chamber 14 and the second chamber 15 are disposed on the left and right sides inside the external clamping handle 1 and are connected. The inner diameter of the first chamber 14 is larger than the inner diameter of the second chamber 15. The first threaded portion 12 is integrally formed on the left end face of the outer rod body 11 and is connected to the inside of the first chamber 14. The through groove 13 is integrally formed on the right end face of the outer rod body 11 and is connected to the inside of the second chamber 15. The first threaded portion 12 is threadedly connected to the inner wall of the threaded sleeve 7. The first limiting groove 16 is evenly opened on the inner wall of the first threaded portion 12 and the first chamber 14 and is positioned correspondingly. The first limiting protrusion 17 is evenly disposed on the inner wall of the second chamber 15.

[0035] In this embodiment, the structure and connection relationship of the external clamping handle 1 are further described. The external clamping handle 1 facilitates clamping, protects the inner clamping handle 2, and further fixes the blade head 5, resulting in good performance. In some embodiments, the inner clamping handle 2 includes an inner rod 21, a second threaded portion 22, a second limiting protrusion 23, a countersunk hole 24, a fixing bolt 25, a third limiting protrusion 26, and a third threaded portion 27. The inner rod 21 is slidably connected to the inner wall of the external clamping handle 1. The second threaded portion 22, the second limiting protrusion 23, and the countersunk hole 24 are sequentially arranged from left to right on the outer surface of the inner rod 21. The threaded mounting seat 6 is threadedly connected to the second threaded portion 22. 3 corresponds to and is slidably connected to the inner wall of the first limiting slide groove 16. The countersunk hole 24 corresponds to the second chamber 15. The fixing bolt 25 is threadedly connected to the inner wall of the countersunk hole 24. One end of the fixing bolt 25 penetrates into the inner rod body 21. The inner placement handle 2 has a placement cavity. The third limiting protrusion 26 is evenly opened on the inner wall of the placement cavity. Both ends of the inner placement handle 2 are provided with a third threaded part 27. The third threaded part 27 is connected to the inside of the placement cavity. The threaded plug 3 and the connecting end 4 are both threadedly connected to the third threaded part 27. The structure and connection relationship of the inner placement handle 2 are further explained. The inner placement handle 2 is set to facilitate the installation, storage and installation of the cutter head 5, and has a good use effect.

[0036] In some embodiments, the threaded plug 3 includes a threaded end cap 31 and a rubber seat 32. The threaded end cap 31 is threadedly connected to the third threaded portion 27 located at the left end of the inner placement of the knife handle 2. The rubber seat 32 is snapped and fixed on the surface of the threaded end cap 31 and contacts one end of the knife head 5. A cross groove is provided on the outer surface of the threaded plug 3. The outer surface of the threaded plug 3 is on the same plane as the left end face of the inner placement of the knife handle 2. The structure and connection relationship of the threaded plug 3 are further explained.

[0037] In this embodiment, such as Figures 1-8 As shown, in some embodiments, the connecting end 4 includes a threaded ring seat 41, a connecting shaft 42, a fixing hole 43, a stepped post 44, a positioning groove 45, and an elastic snap-fit ​​mechanism 46. The threaded ring seat 41 is threadedly connected to the third threaded portion 27 located at the right end of the inner placement tool holder 2. The connecting shaft 42 is integrally formed on the left end face of the threaded ring seat 41 and slidably connected to the inner wall of the inner placement tool holder 2. The fixing hole 43 is opened on the surface of the connecting shaft 42 and corresponds to the position of the countersunk hole 24. One end of the fixing bolt 25 penetrates into the interior of the inner rod body 21 and is threadedly connected to the inner wall of the fixing hole 43. The right end face of the threaded ring seat 41 is on the same plane as the right end face of the inner placement tool holder 2. The stepped post 44 is integrally formed on the right end face of the threaded ring seat 41. The positioning groove 45 is symmetrically opened on the surface of the stepped post 44. The elastic snap-fit ​​mechanism 46 is symmetrically opened on the surface of the stepped post 44 and is offset from the positioning groove 45.

[0038] The connecting end 4 is always located inside the outer clamping handle 1. Further explanation of the structure and connection relationship of the connecting end 4 is provided. The connecting end 4 facilitates the installation of the tool head 5 and provides good performance. The elastic locking mechanism 46 includes a cylinder 461, a locking rod 462, and a spring 463. The cylinder 461 is threaded to the inner wall of the stepped column 44. The locking rod 462 is slidably connected to the inner wall of the cylinder 461 and is fixedly connected to the inner wall of the cylinder 461 by the spring 463. One end of the locking rod 462 extends through the outside of the cylinder 461 and is connected to the opening... The cutter head 5 is secured by a locking hole on its inner wall. Further explanation of the structure and connection of the elastic locking mechanism 46 is provided. The elastic locking mechanism 46 provides initial fixation for the cutter head 5, preventing it from falling off, and has good performance. The cutter head 5 is sleeved on the outside of the stepped column 44. The cutter head 5 includes a cutter tip 51, a second limiting groove 52, and a cutter body 53. The second limiting groove 52 is evenly distributed on the outer surface of the cutter tip 51. The cutter body 53 is integrally formed on the right end face of the cutter tip 51, and a placement groove is provided on the left end face of the cutter tip 51 for placing... The slot and the stepped column 44 are matched in shape. Positioning strips are provided at the corresponding positions of the slot and the positioning groove 45. The locking holes for locking and fixing with the elastic locking mechanism 46 are all provided on the inner wall of the slot. The second limiting slide groove 52 corresponds to and slides with the first limiting protrusion 17 and the third limiting protrusion 26 respectively. The cutter head 5 is set in three groups. The outer diameter of the cutter body 53 in the three groups of cutter heads 5 gradually decreases. The through groove 13 is matched with the outer dimensions of the cutter body 53 with the largest outer diameter. Threaded mounting seat 6 and threaded sleeve are also included. The outer surfaces of the cylinder 7 and the outer clamping handle 1 are both on the same plane. It also includes a rubber block (not shown in the figure) for replacing the cutter head 5. The rubber block (not shown in the figure) is adapted to the outer dimensions of the cutter head 5. The rubber block is used to replace the cutter head 5 when the cutter head 5 inside the inner clamping handle 2 is missing, filling the gap and ensuring that the cutter head 5 is stably installed inside the inner clamping handle 2. The cutter body 53 part on the rubber block is engaged and fixed with the through groove 13. A protective sleeve is provided on the outside of the rubber block. The protective sleeve is on the same plane as the outer surface of the outer clamping handle 1.

[0039] It should be noted that the number and size of the blades 5 are further limited.

[0040] A method for using a portable, replaceable-cutting-edge reamer includes the following steps:

[0041] S1: Tighten the threaded sleeve 7 to separate one end of the outer clamping tool holder 1 from the threaded sleeve 7;

[0042] S2: After removing the outer clamping tool holder 1, remove the threaded plug 3 and take out the tool head 5 from inside the inner clamping tool holder 2;

[0043] S3: After the cutter head 5 is taken out, select the appropriate size of the cutter head 5 according to the usage requirements and install it on the connecting end 4. After installation, put the remaining cutter head 5 into the inner tool holder 2, and then install the threaded plug 3.

[0044] S4: After the threaded plug 3 is installed, the outer clamping handle 1 is placed on the outside of the inner clamping handle 2, and then one end of it is reconnected and fixed to the threaded sleeve 7. The installed cutter head 5 then passes through the through groove 13 on the right end of the outer clamping handle 1.

[0045] In this solution, when the alarm device for the computer chassis is in use, the first chamber 14 and the second chamber 15 are located inside the outer clamping handle 1 and are connected. The inner diameter of the first chamber 14 is larger than the inner diameter of the second chamber 15. The first threaded part 12 is integrally formed on the left end face of the outer rod 11 and is connected to the inside of the first chamber 14. The through groove 13 is integrally formed on the right end face of the outer rod 11 and is connected to the inside of the second chamber 15. The first threaded part 12 is threadedly connected to the inner wall of the threaded sleeve 7. The first limiting groove 16 is evenly opened on the inner wall of the first threaded part 12 and the first chamber 14 and the positions are corresponding. The first limiting protrusion 17 is evenly arranged on the inner wall of the second chamber 15.

[0046] The inner rod body 21 is slidably connected to the inner wall of the outer clamping handle 1. The second threaded part 22, the second limiting protrusion 23, and the countersunk hole 24 are sequentially arranged from left to right on the outer surface of the inner rod body 21. The threaded mounting seat 6 is threadedly connected to the second threaded part 22. The second limiting protrusion 23 corresponds to the position of the first limiting slide groove 16 and is slidably connected to the inner wall of the first limiting slide groove 16. The countersunk hole 24 corresponds to the second chamber 15. The fixing bolt 25 is threadedly connected to the inner wall of the countersunk hole 24, and one end of the fixing bolt 25 penetrates into the inner rod body 21. The inner part of the tool holder 2 has a placement cavity inside. Third limiting protrusions 26 are evenly distributed on the inner wall of the placement cavity. Both ends of the inner tool holder 2 have third threaded portions 27, which communicate with the interior of the placement cavity. Threaded plugs 3 and connecting ends 4 are threadedly connected to the third threaded portions 27. The threaded plug 3 includes a threaded end cap 31 and a rubber seat 32. The threaded end cap 31 is threadedly connected to the third threaded portion 27 located at the left end of the inner tool holder 2. The rubber seat 32 is snapped and fixed to the surface of the threaded end cap 31 and is attached to the tool head. 5. One end of the threaded plug 3 is in contact with the other end of the inner tool holder 2. A cross groove is formed on the outer surface of the threaded plug 3. The outer surface of the threaded plug 3 is on the same plane as the left end face of the inner tool holder 2. The threaded ring seat 41 is threadedly connected to the third threaded part 27 located at the right end of the inner tool holder 2. The connecting shaft 42 is integrally formed and located on the left end face of the threaded ring seat 41 and is slidably connected to the inner wall of the inner tool holder 2. The fixing hole 43 is formed on the surface of the connecting shaft 42 and corresponds to the position of the countersunk hole 24. One end of the fixing bolt 25 passes through the inner rod body 21 and is threadedly connected to the inner wall of the fixing hole 43. The right end face of the threaded ring seat 41 is on the same plane as the right end face of the inner placement of the tool holder 2. The stepped column 44 is integrally formed and set on the right end face of the threaded ring seat 41. The positioning groove 45 is symmetrically opened on the surface of the stepped column 44. The elastic locking mechanism 46 is symmetrically opened on the surface of the stepped column 44 and is offset from the positioning groove 45. The locking rod 462 is slidably connected to the inner wall of the column 461 and a spring 463 is fixedly connected between the inner wall of the column 461 and the inner wall of the column 461. One end of the locking rod 462 extends through the outside of the column 461 and is locked and fixed with the locking hole opened on the inner wall of the tool head 5.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable interchangeable cutting edge reamer, comprising an external clamping shank (1), characterized in that: The inner wall of the outer clamping handle (1) is slidably connected to the inner placement handle (2). One end of the inner placement handle (2) is threadedly connected to a threaded plug (3), and the other end is threadedly connected to a connecting end (4). The inner placement handle (2) is provided with a cutting head (5). The end of the inner placement handle (2) near the threaded plug (3) extends through the outside of the outer clamping handle (1). The end of the inner placement handle (2) extending through the outside of the outer clamping handle (1) is threadedly connected to a threaded mounting seat (6). The surface of the threaded mounting seat (6) is rotatably connected to a threaded sleeve (7). The end of the threaded sleeve (7) away from the surface of the threaded mounting seat (6) is threadedly connected to one end of the outer clamping handle (1). The external clamping handle (1) includes an outer rod body (11), a first threaded portion (12), a through groove (13), a first chamber (14), a second chamber (15), a first limiting slide groove (16), and a first limiting protrusion (17). The first chamber (14) and the second chamber (15) are arranged left and right inside the external clamping handle (1) and are connected. The inner diameter of the first chamber (14) is larger than the inner diameter of the second chamber (15). The first threaded portion (12) is integrally formed and installed in the external clamping handle (1). The left end face of the outer rod (11) is connected to the inside of the first chamber (14). The through groove (13) is integrally formed and disposed on the right end face of the outer rod (11) and connected to the inside of the second chamber (15). The first threaded part (12) is threadedly connected to the inner wall of the threaded sleeve (7). The first limiting groove (16) is evenly opened on the inner wall of the first threaded part (12) and the first chamber (14) and the positions are corresponding. The first limiting protrusion (17) is evenly disposed on the inner wall of the second chamber (15). The inner tool holder (2) includes an inner rod body (21), a second threaded portion (22), a second limiting protrusion (23), a countersunk hole (24), a fixing bolt (25), a third limiting protrusion (26), and a third threaded portion (27). The inner rod body (21) is slidably connected to the inner wall of the outer clamping tool holder (1). The second threaded portion (22), the second limiting protrusion (23), and the countersunk hole (24) are sequentially arranged from left to right on the outer surface of the inner rod body (21). The threaded mounting seat (6) is threadedly connected to the second threaded portion (22). The second limiting protrusion (23) corresponds to the position of the first limiting groove (16) and... The sliding connection is made to the inner wall of the first limiting groove (16). The countersunk hole (24) corresponds to the second chamber (15). The fixing bolt (25) is threaded to the inner wall of the countersunk hole (24). One end of the fixing bolt (25) penetrates into the inner rod body (21). The inner placement handle (2) is provided with a placement cavity. The third limiting protrusion (26) is evenly opened on the inner wall of the placement cavity. Both ends of the inner placement handle (2) are provided with a third threaded part (27). The third threaded part (27) is connected to the inside of the placement cavity. The threaded plug (3) and the connecting end (4) are both threaded to the third threaded part (27).

2. A portable reamer with interchangeable cutting edges according to claim 1, characterized in that, The threaded plug (3) includes a threaded end cap (31) and a rubber seat (32). The threaded end cap (31) is threadedly connected to the third threaded part (27) located at the left end of the inner knife handle (2). The rubber seat (32) is snapped and fixed on the surface of the threaded end cap (31) and contacts one end of the knife head (5). A cross groove is provided on the outer surface of the threaded plug (3). The outer surface of the threaded plug (3) is on the same plane as the left end face of the inner knife handle (2).

3. A portable reamer with interchangeable cutting edges according to claim 2, characterized in that, The connecting end (4) includes a threaded ring seat (41), a connecting shaft (42), a fixing hole (43), a stepped post (44), a positioning groove (45), and an elastic snap-fit ​​mechanism (46). The threaded ring seat (41) is threadedly connected to the third threaded part (27) located at the right end of the inner placement tool holder (2). The connecting shaft (42) is integrally formed on the left end face of the threaded ring seat (41) and slidably connected to the inner wall of the inner placement tool holder (2). The fixing hole (43) is opened on the surface of the connecting shaft (42) and is connected to the countersunk hole. (24) Correspondingly, one end of the fixing bolt (25) penetrates into the inner rod body (21) and is threaded to the inner wall of the fixing hole (43). The right end face of the threaded ring seat (41) is on the same plane as the right end face of the inner placed knife handle (2). The stepped column (44) is integrally formed and set on the right end face of the threaded ring seat (41). The positioning groove (45) is symmetrically opened on the surface of the stepped column (44). The elastic snap-fit ​​mechanism (46) is symmetrically opened on the surface of the stepped column (44) and is offset from the positioning groove (45).

4. A portable reamer with interchangeable cutting edges according to claim 3, characterized in that, The elastic locking mechanism (46) includes a cylinder (461), a locking rod (462) and a spring (463). The cylinder (461) is threaded to the inner wall of the stepped column (44). The locking rod (462) is slidably connected to the inner wall of the cylinder (461) and is fixedly connected to the inner wall of the cylinder (461) with the spring (463). One end of the locking rod (462) extends through the outside of the cylinder (461) and is locked and fixed with a locking hole opened on the inner wall of the cutter head (5).

5. A portable reamer with interchangeable cutting edges according to claim 4, characterized in that, The cutter head (5) is sleeved on the outside of the step column (44). The cutter head (5) includes a cutter end (51), a second limiting groove (52) and a cutter body (53). The second limiting groove (52) is evenly opened on the outer surface of the cutter end (51). The cutter body (53) is integrally formed and set on the right end face of the cutter end (51). The left end face of the cutter end (51) is provided with a placement slot. The placement slot is adapted to the outer dimensions of the step column (44). The placement slot and the positioning groove (45) are respectively provided with positioning strips. The locking holes that are fixed to the elastic locking mechanism (46) are all set on the inner wall of the placement slot. The second limiting groove (52) is respectively corresponding to the first limiting protrusion (17) and the third limiting protrusion (26) and is slidably connected.

6. A portable reamer with interchangeable cutting edges according to claim 2, characterized in that, The cutter head (5) is set in three groups. The outer diameter of the cutter body (53) in the three groups of cutter heads (5) gradually decreases. The through groove (13) is adapted to the outer diameter of the cutter body (53) with the largest outer diameter. The outer surfaces of the threaded mounting seat (6), the threaded sleeve (7) and the outer clamping handle (1) are all on the same plane.

7. The method of using a portable interchangeable cutting edge reamer according to any one of claims 2-6, characterized in that: Includes the following steps: S1: Tighten the threaded sleeve (7) to separate one end of the outer clamping tool holder (1) from the threaded sleeve (7); S2: After removing the external clamping handle (1), remove the threaded plug (3) and take out the cutter head (5) from the inside of the internally placed handle (2). S3: After the cutter head (5) is taken out, select the appropriate cutter head (5) size according to the usage requirements and install it on the connecting end (4). After installation, put the remaining cutter head (5) into the inner placement handle (2) and then install the threaded plug (3). S4: After the threaded plug (3) is installed, the outer clamping handle (1) is placed on the outside of the inner clamping handle (2), and then one end of it is reconnected and fixed to the threaded sleeve (7). The installed cutter head (5) then passes through the through groove (13) on the right end of the outer clamping handle (1).

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