Drill shank center hole machining device

Abstract

The utility model relates to the technical field of drill tool machining, in particular to a drill shank center hole machining device which comprises a rack, a mounting seat, a three-jaw chuck, a clamping table and a drilling mechanism, the mounting seat is fixedly connected to the rack, the three-jaw chuck is connected to the mounting seat, the drilling mechanism comprises a drilling motor and a drill bit, the drilling motor is slidably connected to the rack, and the drilling motor is connected to the clamping table. The sliding direction of the drilling motor is parallel to the axis direction of the three-jaw chuck, the drill bit is connected to the end, close to the three-jaw chuck, of the drilling motor, the axis of the drill bit coincides with the axis of the three-jaw chuck, the clamping table is connected to the mounting base and located on the side, away from the drilling mechanism, of the three-jaw chuck, and a positioning groove is formed in the upper end of the clamping table. And the positioning groove is used for embedding a workpiece. And the clamping table is used for supporting a positioning groove in the end, away from the drilling mechanism, of the workpiece, the workpiece is embedded into the positioning groove, deviation of the workpiece in the clamping process is prevented, and the workpiece can be conveniently kept stable and clamped by workers.

Description

Technical Field

[0001] The present application relates to the technical field of drilling tool processing, and in particular to a drilling tail center hole processing device. Background Art

[0002] The rock drilling tool is a slender drill rod system composed of a drill head, a drill rod, a drill tail and other components. It is the main tool for drilling rocks in construction projects in the fields of mining resource exploitation, transportation road construction, hydropower project construction, urbanization construction, etc.

[0003] One of the main processing operations of the shank is center hole drilling. The center hole is a process hole used to process the center of the workpiece. Most shaft parts have a center hole. The main function of the center hole is to serve as a positioning reference for the workpiece during processing.

[0004] Currently, three-jaw chucks are mainly used to clamp the workpiece. When clamping the workpiece in the three-jaw chuck, the worker needs to lift the workpiece with one hand and adjust the three-jaw chuck with the other hand. The workpiece is relatively heavy. During large-scale processing, the worker has to hold the workpiece for a long time, which is labor-intensive. Utility Model Content

[0005] In order to meet the needs of mass production and reduce the work intensity of staff, the present application provides a shank tail center hole processing device.

[0006] The present application provides a device for machining the center hole of a shank tail using the following technical solution:

[0007] A device for processing a center hole of a shank tail comprises a frame, a mounting seat, a three-jaw chuck, a clamping table and a drilling mechanism, wherein the mounting seat is fixedly connected to the frame, the three-jaw chuck is connected to the mounting seat, the drilling mechanism comprises a drilling motor and a drill bit, the drilling motor is slidably connected to the frame, the sliding direction of the drilling motor is parallel to the axial direction of the three-jaw chuck, the drill bit is connected to one end of the drilling motor close to the three-jaw chuck, the axis of the drill bit coincides with the axis of the three-jaw chuck, the clamping table is connected to the mounting seat, the clamping table is located on a side of the three-jaw chuck away from the drilling mechanism, a positioning groove is provided on the upper end of the clamping table, and the positioning groove is used for a workpiece to be embedded.

[0008] By adopting the above technical solution, the clamping table is used to support the workpiece away from the drilling mechanism, and the positioning groove at one end is used for the workpiece to be embedded, so as to prevent the workpiece from shifting during the clamping process, so as to facilitate the staff to keep the workpiece stable and clamp the workpiece.

[0009] Preferably, it also includes a backrest, which is connected to the side of the three-jaw chuck close to the drilling mechanism, and the side of the backrest away from the drilling mechanism is used for the workpiece to abut, the backrest is provided with a guide hole, the axis of the guide hole coincides with the axis of the drill bit, and the guide hole is used for the drill bit to pass through.

[0010] By adopting the above technical scheme, the backrest is used for the workpiece to abut against one end of the drilling mechanism, which is convenient for quickly positioning the workpiece. There is no need for the staff to judge the length of the workpiece extending out of the three-jaw chuck by naked eyes, which is convenient for controlling the feed amount of the drilling mechanism and improving the processing accuracy of the device. The axis of the guide hole coincides with the axis of the drill bit, which guides the sliding of the drill bit.

[0011] Preferably, there are a plurality of three-jaw chucks, which are spaced apart in a direction perpendicular to the axis of the three-jaw chuck, and the number of the mounting seats, clamping tables and backrests is the same as the number of the three-jaw chucks and corresponds one to one.

[0012] By adopting the above technical solution, a plurality of three-jaw chucks are provided, which facilitates clamping and processing of a plurality of workpieces at the same time, thereby improving processing efficiency.

[0013] Preferably, a connecting plate is connected to the side of the mounting seat away from the drilling mechanism, the length direction of the connecting plate is parallel to the axis direction of the three-jaw chuck, and the clamping platform is connected to the end of the connecting plate away from the mounting seat.

[0014] By adopting the above technical solution, the distance between the two supporting points of the clamping table and the three-jaw chuck on the workpiece is extended through the connecting plate, thereby improving the stability of the workpiece installation.

[0015] Preferably, it also includes a first fixing bolt, the connecting plate is provided with an embedding groove, the embedding groove is used for the lower end of the clamping platform to be embedded, the connecting plate is provided with a first fixing hole, the first fixing hole is connected with the embedding groove, the first fixing bolt is threadedly connected with the first fixing hole and pressed against the outer wall of the clamping platform.

[0016] By adopting the above technical solution, the first bolt is pressed against the outer wall of the clamping table to achieve relative fixation between the clamping table and the connecting plate, which facilitates replacement of clamping tables of different models. When the workpiece is placed on the clamping table, the axis of the workpiece coincides with the axis of the guide hole, making it easier for the three-jaw chuck to clamp the workpiece, thereby improving the versatility of the device.

[0017] Preferably, it also includes a mounting plate and a second fixing bolt, the mounting plate is connected to the mounting seat, the three-jaw chuck is connected to the side of the mounting plate close to the drilling mechanism, the mounting plate is provided with a connecting hole, the mounting seat is provided with a second fixing hole, and the second fixing bolt passes through the connecting hole and is threadedly connected to the second fixing hole.

[0018] By adopting the above technical solution, the three-jaw chuck is connected to the mounting plate, and the mounting plate is threadedly connected to the second fixing hole after passing through the connecting hole through the second fixing connection, thereby realizing the fixation of the three-jaw chuck and the mounting seat, and realizing the detachable parts of the three-jaw chuck and the mounting seat, which is convenient for the maintenance and replacement of the three-jaw chuck and improves the service life of the device.

[0019] Preferably, a limiting plate is connected to one side of the mounting seat close to the mounting plate, and the two limiting plates are located on both sides of the mounting plate along a direction perpendicular to the axis of the three-jaw chuck, and a surface of the limiting plate close to the mounting plate fits with the side wall of the mounting plate.

[0020] By adopting the above technical solution, the two limit plates are respectively fitted with the two side walls of the mounting plate, and the limit plates guide the mounting plate, making it easy to achieve that the connecting hole is aligned with the second fixing hole, thereby improving the installation efficiency of the mounting plate.

[0021] Preferably, it also includes a water pipe and a nozzle, wherein the water pipe is connected to the drilling mechanism, the nozzle is connected to the water pipe, and the nozzle faces the drill bit.

[0022] By adopting the above technical solution, the nozzle is directed toward the drill bit, which facilitates cooling of the workpiece when the drill bit processes the workpiece, reduces the possibility of high-temperature damage to the drill bit, and increases the service life of the drill bit.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The clamping table is used to support the workpiece away from the drilling mechanism. The positioning groove at one end is used for the workpiece to be embedded to prevent the workpiece from shifting during the clamping process, so that the workpiece can be kept stable and clamped by the staff;

[0025] 2. The backing is used for the workpiece to abut against one end of the drilling mechanism, which is convenient for quickly positioning the workpiece. The staff does not need to judge the length of the workpiece extending out of the three-jaw chuck by naked eyes, which is convenient for controlling the feed amount of the drilling mechanism and improving the processing accuracy of the device. The axis of the guide hole coincides with the axis of the drill bit, which guides the sliding of the drill bit.

[0026] 3. The first bolt is pressed against the outer wall of the clamping table to achieve relative fixation between the clamping table and the connecting plate, which is convenient for replacing clamping tables of different models. When the workpiece is placed on the clamping table, the axis of the workpiece coincides with the axis of the guide hole, which is convenient for the three-jaw chuck to clamp the workpiece and improve the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a shank center hole processing device.

[0028] Figure 2 It is a cross-sectional view of a device for machining the center hole of a shank tail.

[0029] Figure 3 It is a cross-sectional view of a device for machining the center hole of a shank tail.

[0030] Figure 4 It is a cross-sectional view of a device for machining the center hole of a shank tail.

[0031] Description of reference numerals:

[0032] 1. Workbench; 11. Frame; 12. Mounting seat; 121. Second fixing hole; 122. Feeding port; 13. Connecting plate; 131. Embedding groove; 132. First fixing hole; 14. First fixing bolt; 15. Second fixing bolt; 16. Limiting plate;

[0033] 2. Clamping mechanism; 21. Three-jaw chuck; 22. Clamping platform; 221. Positioning groove; 222. Insert block; 23. Backer; 231. Abutment plate; 2311. Guide hole; 232. Support block; 24. Mounting plate; 241. Connecting hole; 242. Connecting hole;

[0034] 3. drilling mechanism; 31. first guide rail; 32. first driving source; 33. first sliding seat; 331. first accommodating chamber; 34. drilling motor; 35. drill bit; 36. first transmission assembly; 361. first driving pulley; 362. first driven pulley; 363. first belt body; 37. first rotating shaft; 38. water pipe; 39. nozzle;

[0035] 4. Chamfering mechanism; 41. Second guide rail; 42. Second driving source; 43. Second sliding seat; 431. Second accommodating chamber; 44. Chamfering motor; 45. Chamfering knife; 46. Second transmission assembly; 461. Second driving pulley; 462. Second driven pulley; 463. Second belt body; 47. Second rotating shaft. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 The embodiment of the present application discloses a shank tail center hole processing device including a workbench 1 and a clamping mechanism 2. The workbench 1 includes a frame 11 and a mounting seat 12. The mounting seat 12 is fixedly connected to the upper end of the frame 11. The mounting seat 12 is fixedly connected to a limit plate 16 on one side along the width direction of the frame 11, and two limit plates 16 are provided. The two limit plates 16 are symmetrically distributed along the length direction of the frame 11. The mounting seat 12 is provided with a feed port 122, and the feed port 122 passes through the mounting seat 12 along the width direction of the frame 11, and the feed port 122 is located between the two limit plates 16.

[0038] Reference Figure 1 and Figure 2The clamping mechanism 2 includes a mounting plate 24. The mounting plate 24 is fixedly connected to one side of the mounting seat 12 close to the limit plate 16. The mounting plate 24 is located between the two limit plates 16. The side walls of the mounting plate 24 on both sides along the length direction of the frame 11 are in contact with the surface of the limit plate 16 facing the mounting plate 24. The mounting plate 24 is provided with a connecting hole 242, and the connecting hole 242 is connected to the feed port 122. The mounting plate 24 is provided with a plurality of connecting holes 241, and the plurality of connecting holes 241 are distributed at intervals along the circumference of the mounting plate 24. In this embodiment, four connecting holes 241 are provided, and the four connecting holes 241 are distributed at the four corners of the mounting plate 24. The workbench 1 also includes a second fixing bolt 15. The mounting seat 12 is provided with a second fixing hole 121, and the second fixing bolt 15 passes through the connecting hole 241 and is threadedly connected to the second fixing hole 121. The number of the second fixing holes 121 and the second fixing bolt 15 is the same as the number of the connecting holes 241 and corresponds one to one.

[0039] The clamping mechanism 2 also includes a three-jaw chuck 21 and a backrest 23. The three-jaw chuck 21 is fixedly connected to a side surface of the mounting plate 24 away from the mounting seat 12, and the axis of the three-jaw chuck 21 coincides with the axis of the connecting hole 242. The backrest 23 is fixedly connected to a side of the three-jaw chuck 21 away from the mounting plate 24. The backrest 23 includes an abutment plate 231 and a support block 232. One end of the support block 232 is fixedly connected to a side surface of the three-jaw chuck 21 away from the mounting plate 24. The abutment plate 231 is fixedly connected to an end of the support block 232 away from the three-jaw chuck 21, and an end of the abutment plate 231 close to the three-jaw chuck 21 is used for abutment of the workpiece. The length direction of the abutment plate 231 is parallel to the length direction of the frame 11, and two support blocks 232 are provided, and the two support blocks 232 are symmetrically distributed along the length direction of the abutment plate 231. The abutting plate 231 is provided with a guide hole 2311 , and the axis of the guide hole 2311 coincides with the axis of the three-jaw chuck 21 .

[0040] Reference Figure 2 and Figure 3, the workbench 1 also includes a first fixing bolt 14. A connecting plate 13 is fixedly connected to one side of the mounting seat 12 away from the three-jaw chuck 21, and the connecting plate 13 is located below the feed port 122. The length direction of the connecting plate 13 is parallel to the width direction of the frame 11. The clamping mechanism 2 also includes a clamping platform 22, which is fixedly connected to one side of the connecting plate 13 away from the mounting seat 12. A positioning groove 221 is provided at the upper end of the clamping platform 22, and the positioning groove 221 is used for the workpiece to be embedded. In this embodiment, the positioning groove 221 is a V-shaped groove, and the groove wall of the V-shaped groove abuts against the outer wall of the workpiece. An embedding groove 131 is provided at one end of the connecting plate 13 away from the mounting seat 12, and the embedding groove 131 penetrates the connecting plate 13 in the vertical direction. An embedding block 222 is connected to the lower end of the clamping platform 22, and the embedding block 222 is embedded in the embedding groove 131. A first fixing hole 132 is provided on one side of the connecting plate 13 along the length direction of the frame 11, and the first fixing hole 132 is connected to the embedding groove 131. The first fixing bolt 14 is threadedly connected to the first fixing hole 132 and abuts against the side wall of the insert block 222 .

[0041] Reference Figure 1 In this embodiment, two mounting seats 12 are provided, and the two mounting seats 12 are spaced apart along the length direction of the frame 11. The number of the clamping mechanisms 2 is the same as the number of the mounting seats 12 and corresponds one to one.

[0042] Reference Figure 1 and Figure 3, a shank center hole processing device also includes a drilling mechanism 3 and a chamfering mechanism 4. The drilling mechanism 3 and the chamfering mechanism 4 correspond to a three-jaw chuck 21 respectively. The drilling mechanism 3 includes a first guide rail 31, a first driving source 32, a first sliding seat 33, a drilling motor 34, a first transmission assembly 36, a first rotating shaft 37 and a drill bit 35. The first guide rail 31 is fixedly connected to the upper end of the frame 11, the length direction of the first guide rail 31 is parallel to the width direction of the frame 11, the first sliding seat 33 is slidably connected to the upper end of the first guide rail 31, and the sliding direction of the first sliding seat 33 is parallel to the length direction of the first guide rail 31. The first driving source 32 is connected to the upper end of the frame 11, and the first driving source 32 is used to drive the first sliding seat 33 to slide. In this embodiment, the first driving source 32 adopts a motor, the housing of the motor is fixedly connected to the upper end of the frame 11, the output shaft of the motor is coaxially fixedly connected to one end of the screw rod, and the screw rod is threadedly connected to the first sliding seat 33. The first sliding seat 33 is provided with a first accommodating cavity 331. The housing of the drilling motor 34 is fixedly connected to the side of the first sliding seat 33 away from the three-jaw chuck 21. The output shaft of the drilling motor 34 extends into the first accommodating cavity 331. The first rotating shaft 37 is rotatably embedded in the first accommodating cavity 331. The rotation axis of the first rotating shaft 37 is parallel to the axis of the three-jaw chuck 21. One end of the first rotating shaft 37 close to the three-jaw chuck 21 extends out of the first sliding seat 33. The first transmission assembly 36 is connected between the drilling motor 34 and the first rotating shaft 37. The first transmission assembly includes a first driving pulley 361, a first driven pulley 362 and a first belt body 363. The first driving pulley 361 is coaxially fixedly connected to the output shaft of the drilling motor 34. The first driven pulley 362 is coaxially fixedly connected to one end of the first rotating shaft 37 close to the drilling motor 34. The first belt body 363 is sleeved on the outer periphery of the first driving pulley 361 and the first driven pulley 362. The drill bit 35 is coaxially fixedly connected to one end of the first rotating shaft 37 close to the three-jaw chuck 21 , and the axis of the drill bit 35 coincides with the axis of the guide hole 2311 .

[0043] The drilling mechanism 3 further includes a water pipe 38 and a nozzle 39 . One end of the water pipe 38 is fixedly connected to the upper end of the sliding seat, and the nozzle 39 is fixedly connected to the other end of the water pipe 38 . The nozzle 39 faces the drill bit 35 .

[0044] Reference Figure 4The chamfering mechanism 4 includes a second guide rail 41, a second driving source 42, a second sliding seat 43, a chamfering motor 44, a second transmission assembly 46, a second rotating shaft 47 and a chamfering cutter 45. The second guide rail 41 is fixedly connected to the upper end of the frame 11, and the length direction of the second guide rail 41 is parallel to the length direction of the first guide rail 31. The second sliding seat 43 is slidably connected to the upper end of the second guide rail 41, and the sliding direction of the second sliding seat 43 is parallel to the length direction of the second guide rail 41. The second driving source 42 is connected to the upper end of the frame 11, and the second driving source 42 is used to drive the second sliding seat 43 to slide. In this embodiment, the second driving source 42 adopts a motor, the housing of the motor is fixedly connected to the upper end of the frame 11, the output shaft of the motor is coaxially connected to one end of the screw rod, and the screw rod is threadedly connected to the second sliding seat 43. The second sliding seat 43 is provided with a second accommodating chamber 431, the housing of the chamfering motor 44 is fixedly connected to the side of the second sliding seat 43 away from the three-jaw chuck 21, the output shaft of the chamfering motor 44 extends into the second accommodating chamber 431, the second rotating shaft 47 is rotatably embedded in the second accommodating chamber 431, the rotation axis of the second rotating shaft 47 is parallel to the axis of the three-jaw chuck 21, the end of the second rotating shaft 47 close to the three-jaw chuck 21 extends out of the second sliding seat 43, and the second transmission assembly 46 is connected between the chamfering motor 44 and the second rotating shaft 47. The second transmission assembly 46 includes a second driving pulley 461, a second driven pulley 462 and a second belt body 463, the second driving pulley 461 is coaxially fixedly connected to the output shaft of the chamfering motor 44, the second driven pulley 462 is coaxially fixedly connected to the other end of the second rotating shaft 47, and the second belt body 463 is sleeved on the outer periphery of the second driving pulley 461 and the second driven pulley 462. The chamfering cutter 45 is coaxially fixedly connected to one end of the second rotating shaft 47 close to the three-jaw chuck 21 , and the axis of the chamfering cutter 45 coincides with the axis of the guide hole 2311 .

[0045] The implementation principle of a shank center hole processing device in the embodiment of the present application is as follows: the workpiece is installed in the three-jaw chuck 21 opposite to the drilling mechanism 3, one end of the workpiece passes through the feed port 122 and the connecting hole 242 in sequence and then abuts against the side surface of the abutment plate 231 close to the three-jaw chuck 21, and the other end of the workpiece is embedded in the positioning groove 221, and the outer wall of the workpiece fits with the groove wall of the positioning groove 221. The three-jaw chuck 21 is adjusted so that the three-jaw chuck 21 clamps the outer wall of the workpiece, and the theoretical axis of the center hole of the workpiece coincides with the axis of the guide hole 2311. The drilling motor 34 works to drive the drill bit 35 to rotate, the water pipe 38 sprays water to the drill bit 35 through the nozzle 39, and the first driving source 32 works to drive the first sliding seat 33 to slide close to the workpiece. After the center hole processing is completed, the first driving source 32 reverses, drives the first sliding seat 33 to slide away from the workpiece, and the drilling motor 34 stops. Release the three-jaw chuck 21 and take out the workpiece.

[0046] Install the workpiece in the three-jaw chuck 21 opposite to the chamfering mechanism 4. One end of the workpiece passes through the feed port 122 and the connecting hole 242 in sequence and then abuts against the side surface of the abutment plate 231 close to the three-jaw chuck 21. The other end of the workpiece is embedded in the positioning groove 221, and the outer wall of the workpiece fits with the groove wall of the positioning groove 221. Adjust the three-jaw chuck 21 so that the three-jaw chuck 21 clamps the outer wall of the workpiece, and the theoretical axis of the center hole of the workpiece coincides with the axis of the guide hole 2311. The chamfering motor 44 works to drive the chamfering knife 45 to rotate, and the second drive source 42 works to drive the second sliding seat 43 to slide close to the workpiece. After completing the chamfering of the workpiece, the second drive source 42 reverses, drives the second sliding seat 43 to slide away from the workpiece, and the chamfering motor 44 stops. Release the three-jaw chuck 21 and take out the workpiece.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for machining the center hole of a shank tail, characterized in that: The invention comprises a frame (11), a mounting seat (12), a three-jaw chuck (21), a clamping table (22) and a drilling mechanism (3); the mounting seat (12) is fixedly connected to the frame (11); the three-jaw chuck (21) is connected to the mounting seat (12); the drilling mechanism (3) comprises a drilling motor (34) and a drill bit (35); the drilling motor (34) is slidably connected to the frame (11); the sliding direction of the drilling motor (34) is parallel to the sliding direction of the three-jaw chuck (21). ); the drill bit (35) is connected to one end of the drilling motor (34) close to the three-jaw chuck (21); the axis of the drill bit (35) coincides with the axis of the three-jaw chuck (21); the clamping platform (22) is connected to the mounting seat (12); the clamping platform (22) is located on a side of the three-jaw chuck (21) away from the drilling mechanism (3); a positioning groove (221) is provided at the upper end of the clamping platform (22); the positioning groove (221) is used for inserting a workpiece.

2. The shank tail center hole processing device according to claim 1, characterized in that: The invention also comprises a backing (23); the backing (23) is connected to a side of the three-jaw chuck (21) close to the drilling mechanism (3); a side of the backing (23) away from the drilling mechanism (3) is used for abutting against a workpiece; the backing (23) is provided with a guide hole (2311); the axis of the guide hole (2311) coincides with the axis of the drill bit (35); and the guide hole (2311) is used for allowing the drill bit (35) to pass through.

3. The shank tail center hole processing device according to claim 2, characterized in that: A plurality of three-jaw chucks (21) are provided; the plurality of three-jaw chucks (21) are spaced apart in a direction perpendicular to the axis of the three-jaw chuck (21); the number of the mounting seat (12), the clamping platform (22) and the backrest (23) is the same as the number of the three-jaw chucks (21) and corresponds one to one.

4. The shank tail center hole processing device according to claim 1, characterized in that: A connecting plate (13) is connected to the side of the mounting seat (12) away from the drilling mechanism (3); the length direction of the connecting plate (13) is parallel to the axial direction of the three-jaw chuck (21); and the clamping platform (22) is connected to an end of the connecting plate (13) away from the mounting seat (12).

5. The shank center hole processing device according to claim 4, characterized in that: The invention also comprises a first fixing bolt (14); the connecting plate (13) is provided with an embedding groove (131); the embedding groove (131) is used for embedding the lower end of the clamping platform (22); the connecting plate (13) is provided with a first fixing hole (132); the first fixing hole (132) is connected to the embedding groove (131); the first fixing bolt (14) is threadedly connected to the first fixing hole (132) and is pressed against the outer wall of the clamping platform (22).

6. The shank tail center hole processing device according to claim 1, characterized in that: It also comprises a mounting plate (24) and a second fixing bolt (15); the mounting plate (24) is connected to the mounting seat (12); the three-jaw chuck (21) is connected to a side of the mounting plate (24) close to the drilling mechanism (3); the mounting plate (24) is provided with a connecting hole (241); the mounting seat (12) is provided with a second fixing hole (121); the second fixing bolt (15) passes through the connecting hole (241) and is threadedly connected to the second fixing hole (121).

7. The device for machining the center hole of the shank tail according to claim 6, characterized in that: A side of the mounting seat (12) close to the mounting plate (24) is connected to a limiting plate (16); the two limiting plates (16) are located on both sides of the mounting plate (24) along a direction perpendicular to the axis of the three-jaw chuck (21); and a surface of one side of the limiting plate (16) close to the mounting plate (24) is in contact with a side wall of the mounting plate (24).

8. The shank tail center hole processing device according to claim 1, characterized in that: It also includes a water pipe (38) and a spray head (39); the water pipe (38) is connected to the drilling mechanism (3); the spray head (39) is connected to the water pipe (38); and the spray head (39) faces the drill bit (35).

Images