High-precision milling cutter with clamping structure

Abstract

The invention discloses a high-precision milling cutter with a clamping structure, and relates to the field of milling cutters, the high-precision milling cutter comprises a milling cutter body and a mounting shell nested at the upper end of the milling cutter body, the upper part of the mounting shell is mounted at the lower end of a transmission main shaft through a bolt, and a clamping block is fixedly mounted at the lower end of the mounting shell; a portable clamping mechanism is arranged on the surface of the clamping block, and the portable clamping mechanism is provided with a rotary knob block capable of achieving rapid clamping. According to the high-precision milling cutter with the clamping structure, when a rotary knob block is used for clamping, the rotary knob block rotates and moves downwards, at the moment, the rotary knob block drives a long-strip-shaped moving plate to descend along a sliding groove through rotation of a rotary shaft on the surface, a second elastic air bag pushes a clamping block under expansion at the moment, and when the milling cutter body is installed, a positioning block is embedded into a positioning groove for limiting and positioning; and secondary positioning and clamping can be conveniently carried out, the clamping stability is further improved, the stability of the clamping structure is improved, and the milling cutter body is prevented from falling off due to unstable clamping.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, in particular to a high-precision milling cutter with a clamping structure. Background Art

[0002] A milling cutter is a cutting tool used for metal processing. It is mainly used for milling the surface, holes, grooves, contours, etc. of a workpiece. It removes material from the workpiece by cutting the rotating blade to form the required shape and size. Milling cutters are widely used in machinery manufacturing, mold making, automobiles, aerospace and other industries; In the prior art, the fixing and clamping of the milling cutter is prone to loosening, which is not conducive to the fixation of the milling cutter, and the milling cutter is easily disengaged due to excessive centrifugal force during rotation; In order to overcome the above-mentioned shortcomings, a Chinese patent of the prior art (Announcement No. CN116921749A) discloses a milling cutter clamping device, which includes a mounting cylinder, a cover plate is provided at one end of the mounting cylinder, a fixing cylinder for clamping the milling cutter to be installed is provided inside the mounting cylinder, the fixing cylinder is detachably provided on the cover plate, and the fixing cylinder is formed by splicing two mutually symmetrical semi-cylinders; a spiral groove is provided on the outside of the fixing cylinder, and a plurality of annular grooves are provided inside the fixing cylinder, and a part of each of the annular grooves is connected to the spiral groove; a plurality of spiral heat-conducting cylinders are respectively provided on the outside of the two semi-cylinders, and all the spiral heat-conducting cylinders are spliced ​​to form a spiral heat-conducting pipe, the spiral heat-conducting pipe is wound inside the spiral groove, and the spiral heat-conducting pipe is adapted to the spiral groove; it is convenient to improve the covering and clamping effect of the milling cutter, and is also used to improve the cooling and heat dissipation of the milling cutter; In order to overcome the above shortcomings, the Chinese patent of the prior art (Announcement No. CN116117216A) discloses a milling cutter clamping device, wherein a milling cutter head is provided on the top of the milling cutter body, a filter chip breaker groove is provided on the milling cutter head, a milling cutter mounting portion is provided on the bottom of the milling cutter body, a mounting groove is provided on the mounting block, a rotating cover threadedly connected to the mounting block is provided on the outer wall of the mounting block, a plug hole is provided through the rotating cover, the milling cutter body is provided with the plug hole, the milling cutter mounting portion is inserted into the mounting groove, four clamping blocks are provided in the mounting groove, and each clamping block is provided with a clamping mechanism. The four surfaces of the milling cutter can be contacted and abutted synchronously through the four clamping blocks, the clamping area is wide, and the clamping effect on the milling cutter is good; Although the existing technology can overcome the above-mentioned shortcomings, there are still other problems in its operation, such as: after the milling cutter is clamped, the positioning of its end is inconvenient and it is easy to rotate the angle, causing the clamping of the milling cutter to be offset and unable to be fixed for secondary positioning; when there is impact force, the milling cutter is easy to offset and the clamping parts are easy to be damaged. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision milling cutter with a clamping structure to solve the problem raised in the above background technology that after the milling cutter is clamped, its end is inconvenient to position and it is easy to rotate the angle, causing the clamping of the milling cutter to be offset and unable to be fixed for secondary positioning. When there is impact force, the milling cutter is easy to offset and the clamping parts are easy to be damaged.

[0004] To achieve the above object, the present invention provides the following technical solution: a high-precision milling cutter with a clamping structure, comprising a milling cutter body and a mounting shell nested and installed on the upper end of the milling cutter body, and the upper end of the mounting shell is mounted on the lower end of the transmission spindle by bolts; A clamping block is fixedly mounted on the lower end of the mounting shell, and a portable clamping mechanism is arranged on the surface of the clamping block, and the portable clamping mechanism is provided with a quick-clamping knob block, and the knob block is sleeved on the outer side of the upper end of the clamping block; The upper end of the knob block is provided with a rotating shaft, and the inner side of the rotating shaft is provided with a secondary positioning clamping mechanism, and the secondary positioning clamping mechanism is provided with a positioning and clamping clamping block, and the clamping block is arranged inside the mounting shell.

[0005] A mounting plate is arranged at the upper end of the mounting shell, and a protective damping mechanism for protecting the milling cutter is arranged between the mounting plate and the mounting shell, and the protective damping mechanism is provided with a damping protection rod, and the damping protection rod is arranged between the mounting shell and the mounting plate.

[0006] Furthermore, the interior of the knob block is threadedly connected to the knob block through a threaded section, the bottom of the knob block is open, and a stopper to prevent falling is provided at the lower end of the knob block.

[0007] Furthermore, an anti-skid protrusion is arranged on the inner side of the lower end of the knob block, and the anti-skid protrusion is arranged in an arc shape, and the anti-skid protrusion corresponds to the milling cutter body.

[0008] Furthermore, the secondary positioning and clamping mechanism includes a long movable plate fixedly installed on the inner side of the rotating shaft, and a slide groove is opened inside the mounting shell, and the upper end of the long movable plate is located inside the slide groove.

[0009] Furthermore, a pressure plate is fixedly installed on the outer side of the long movable plate, and a first elastic airbag is fixedly installed on the lower end of the pressure plate, and the lower end of the first elastic airbag is fixedly installed inside the mounting shell, and an air guide tube is installed through the outer side of the lower end of the first elastic airbag, a second elastic airbag is arranged on the inner side of the upper end of the air guide tube, and a locking block is fixedly installed on the inner side of the second elastic airbag, and the locking block corresponds to the position of the locking groove opened on the upper end of the milling cutter body.

[0010] Furthermore, limit blocks are fixedly installed at the upper and lower ends of the locking block, and the limit blocks are slidably connected to the limit grooves opened inside the mounting shell, and a return spring is fixedly installed on the inner side of the limit block, and the inner side of the return spring is fixedly installed inside the mounting shell.

[0011] Furthermore, a positioning groove is provided inside the installation shell, and a positioning block is fixedly installed on the upper end of the milling cutter body, and the positioning block and the positioning groove are arranged correspondingly, and the positioning block and the positioning groove are both plate-shaped.

[0012] Furthermore, the protective damping mechanism also includes a lifting and positioning column fixedly installed at the lower end of the mounting plate, and a sealing plate is fixedly installed at the lower end of the lifting and positioning column, and the sealing plate fits the inner wall of the buffer bin opened inside the mounting shell.

[0013] Furthermore, four lifting and positioning columns are provided, and the lifting and positioning columns are distributed at the four corners of the lower end of the mounting plate, and a return spring is provided at the lower end of the sealing plate, and the lower end of the return spring is provided at the bottom of the buffer bin.

[0014] Furthermore, an air outlet is installed through the interior of the installation shell, and the air outlet is communicated with the interior of the buffer bin.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A mechanism capable of quick clamping is provided. When the milling cutter is used, the milling cutter body is embedded into the mounting shell along the inside of the clamping block. At this time, the knob block is rotated so that the knob block is lowered and fixed to the bottom of the clamping block through the setting of the threaded section. At this time, with the closing of the lower end of the clamping block, the milling cutter body can be fixed. At the same time, with the setting of the anti-slip protrusion, the friction force of the milling cutter body when being clamped can be increased. The upper part of the mounting shell is fixedly installed on the lower end of the transmission spindle under the setting of bolts, so that the milling cutter body can be conveniently clamped and fixed, thereby improving the convenience of clamping and facilitating the staff to perform fixed installation.

[0016] 2. When clamped by the knob block, the knob block rotates and moves downward. At this time, the knob block rotates through the rotating shaft on the surface to drive the long moving plate to descend along the slide groove. When the long moving plate descends, the first elastic airbag is squeezed through the pressure plate. After the first elastic airbag is squeezed, the gas inside it is transported to the second elastic airbag through the air guide tube. At this time, the second elastic airbag pushes the engaging block under expansion. When the milling cutter body is installed, the positioning block is embedded in the positioning groove for limited positioning, so that the position of the engaging groove corresponds to the position of the engaging block, so that when the engaging block is pushed by the second elastic airbag, The locking block can be embedded in the locking groove and fixed, and the locking block moves through the limit block and slides along the limit groove. When the milling cutter body needs to be removed, the knob block is rotated to move up, so that the long moving plate drives the pressure plate along the slide groove to stop squeezing the first elastic airbag. At this time, the second elastic airbag stops expanding, and under the elastic force of the return spring, the limit block is pushed along the limit groove to drive the locking block outward. At this time, the milling cutter body can be easily removed, and secondary positioning and clamping can be easily performed, which further improves the stability of the clamping, improves the stability of the clamping structure, and prevents the milling cutter body from being unstable and falling.

[0017] 3. When the milling cutter body is cutting, the transmission spindle moves downward. At this time, after the milling cutter body contacts the workpiece, the milling cutter body pushes the mounting shell upward, so that the mounting shell moves upward, and as the sealing plate at the lower end of the lifting and positioning column moves, the lower end of the sealing plate squeezes the air inside the buffer bin to relieve the pressure. At the same time, under the elastic force of the buffer spring, buffering protection is performed, and the damping protection rod between the mounting shell and the mounting plate is used. The setting of the damping protection rod can avoid the reciprocating vibration of the buffer spring, so as to achieve the effect of shock absorption protection. After the air inside the buffer bin is squeezed, it is discharged through the air outlet, so as to achieve the effect of pressure relief, avoiding the milling cutter body from being damaged by impact due to excessive downward pressure during cutting, and at the same time, when the milling cutter body is cutting, it is avoided that the milling cutter body is offset and damaged due to the excessive hardness of the cutting material, thereby improving the cutting accuracy of the milling cutter and ensuring high cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a bottom-up three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional three-dimensional structure of the installation housing of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the clamping block of the present invention in top cross-section; Figure 5 It is a top view of the three-dimensional structure of the rotating shaft of the present invention; Figure 6 It is a schematic diagram of the cutaway three-dimensional structure of the engaging block of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle; Figure 8 It is a schematic diagram of the three-dimensional structure of the secondary positioning clamping mechanism of the present invention; Fig. 9 This is a schematic diagram of a cross-sectional three-dimensional structure of a buffer spring of the present invention; Fig.10 For the present invention Fig. 9 Enlarged structural diagram at B in the middle.

[0019] In the figure: 1. milling cutter body; 2. mounting shell; 3. clamping block; 4. positioning block; 5. positioning groove; 6. threaded section; 7. knob block; 8. anti-skid protrusion; 9. transmission spindle; 10. rotating shaft; 11. long movable plate; 12. slide groove; 13. pressure plate; 14. first elastic airbag; 15. air guide tube; 16. second elastic airbag; 17. engaging block; 18. engaging groove; 19. limit block; 20. limit groove; 21. reset spring; 22. damping protection rod; 23. mounting plate; 24. lifting and positioning column; 25. sealing plate; 26. buffer bin; 27. buffer spring; 28. air outlet. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1: Figure 1-Figure 5 The technical solution shown is a high-precision milling cutter with a clamping structure. In order to solve the problem of the inconvenience and tediousness of clamping the milling cutter, the following is disclosed: a milling cutter body 1 and a mounting shell 2 nested and installed on the upper end of the milling cutter body 1, and the upper part of the mounting shell 2 is mounted on the lower end of the transmission spindle 9 by bolts, a clamping block 3 is fixedly installed on the lower end of the mounting shell 2, and a portable clamping mechanism is arranged on the surface of the clamping block 3, and the portable clamping mechanism is provided with a quick-clamping knob block 7, the knob block 7 is sleeved on the outer side of the upper end of the clamping block 3, the inside of the knob block 7 is threadedly connected with the knob block 7 through a threaded section 6, and the bottom of the knob block 7 is open, and the lower end of the knob block 7 is provided with an anti-dropping stopper, and the inner side of the lower end of the knob block 7 is provided with an anti-slip protrusion 8, and the anti-slip protrusion 8 is arranged in an arc shape, and the anti-slip protrusion 8 corresponds to the milling cutter body 1; A mechanism capable of quick clamping is provided. When the milling cutter is used, the milling cutter body 1 is embedded into the mounting shell 2 along the inside of the clamping block 3. At this time, the knob block 7 is rotated so that the knob block 7 is lowered and fixed to the bottom of the clamping block 3 through the setting of the threaded section 6. At this time, with the closing of the lower end of the clamping block 3, the milling cutter body 1 can be fixed. At the same time, with the setting of the anti-slip protrusion 8, the friction force of the milling cutter body 1 when being clamped can be increased. The upper part of the mounting shell 2 is fixedly installed on the lower end of the transmission spindle 9 with the setting of bolts, so that the milling cutter body 1 can be conveniently clamped and fixed, thereby improving the convenience of clamping and facilitating the staff to perform fixed installation.

[0022] Embodiment 2: Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The technical solution shown in the embodiment is based on the first embodiment. In order to solve the problem of poor clamping and positioning effect, the following is disclosed: a rotating shaft 10 is arranged at the upper end of the knob block 7, and a secondary positioning and clamping mechanism is arranged on the inner side of the rotating shaft 10, and the secondary positioning and clamping mechanism is provided with a positioning and clamping clamping block 17, and the clamping block 17 is arranged inside the mounting shell 2, the secondary positioning and clamping mechanism includes a long movable plate 11 fixedly installed on the inner side of the rotating shaft 10, and a slide groove 12 is opened inside the mounting shell 2, the upper end of the long movable plate 11 is located inside the slide groove 12, a pressing plate 13 is fixedly installed on the outer side of the long movable plate 11, and a first elastic airbag 14 is fixedly installed on the lower end of the pressing plate 13, and the lower end of the first elastic airbag 14 is fixedly installed inside the mounting shell 2, and the first elastic airbag 14 is fixedly installed inside the mounting shell 2. An air guide tube 15 is installed through the outer side of the lower end of the elastic air bag 14, and a second elastic air bag 16 is arranged on the inner side of the upper end of the air guide tube 15, and a clamping block 17 is fixedly installed on the inner side of the second elastic air bag 16, and the clamping block 17 corresponds to the position of the clamping groove 18 opened at the upper end of the milling cutter body 1, and the upper and lower ends of the clamping block 17 are fixedly installed with a limit block 19, and the limit block 19 is slidably connected with the limit groove 20 opened in the installation shell 2, and a return spring 21 is fixedly installed on the inner side of the limit block 19, and the inner side of the return spring 21 is fixedly installed in the inside of the installation shell 2, and a positioning groove 5 is opened in the interior of the installation shell 2, and a positioning block 4 is fixedly installed on the upper end of the milling cutter body 1, and the positioning block 4 is arranged corresponding to the positioning groove 5, and the positioning block 4 and the positioning groove 5 are both plate-shaped; When the knob block 7 is clamped, the knob block 7 rotates and moves downward. At this time, the knob block 7 rotates through the rotating shaft 10 on the surface to drive the long movable plate 11 to descend along the slide groove 12. When the long movable plate 11 descends, the first elastic airbag 14 is squeezed through the pressure plate 13. After the first elastic airbag 14 is squeezed, the gas inside it is transported to the second elastic airbag 16 through the air guide tube 15. At this time, the second elastic airbag 16 pushes the locking block 17 under expansion. When the milling cutter body 1 is installed, the positioning block 4 is embedded in the positioning groove 5 for limiting positioning, so that the locking groove 18 corresponds to the position of the locking block 17, so that when the locking block 17 is pushed by the second elastic airbag 16 , can be embedded in the locking groove 18 and fixed, the locking block 17 moves through the limit block 19 and slides along the limit groove 20. When the milling cutter body 1 needs to be removed, the knob block 7 is rotated to move up, so that the long movable plate 11 drives the pressure plate 13 along the slide groove 12 to stop squeezing the first elastic airbag 14. At this time, the second elastic airbag 16 stops expanding, and under the elastic force of the return spring 21, the limit block 19 is pushed along the limit groove 20 to drive the locking block 17 outward. At this time, the milling cutter body 1 can be easily removed, and secondary positioning and clamping can be easily performed, which further improves the stability of the clamping, improves the stability of the clamping structure, and prevents the milling cutter body 1 from being unstable and falling.

[0023] Embodiment 3: Figure 1 , Figure 2 , Figure 3 , Figure 6 , Fig. 9 and Fig.10 The technical solution shown, on the basis of the second embodiment, in order to solve the problem that the milling cutter is easily damaged and the cutting accuracy is not high, discloses: a mounting plate 23 is provided at the upper end of the mounting shell 2, and a protective damping mechanism for protecting the milling cutter is provided between the mounting plate 23 and the mounting shell 2, and the protective damping mechanism is provided with a damping protection rod 22, and the damping protection rod 22 is arranged between the mounting shell 2 and the mounting plate 23, the protective damping mechanism also includes a lifting and positioning column 24 fixedly installed at the lower end of the mounting plate 23, and a sealing plate 25 is fixedly installed at the lower end of the lifting and positioning column 24, and the sealing plate 25 is attached to the inner wall of the buffer bin 26 opened inside the mounting shell 2, four lifting and positioning columns 24 are provided, and the lifting and positioning columns 24 are distributed at the four corners of the lower end of the mounting plate 23, and a return spring 21 is provided at the lower end of the sealing plate 25, and the lower end of the return spring 21 is arranged at the bottom of the buffer bin 26, and an air outlet 28 is installed through the interior of the mounting shell 2, and the air outlet 28 is communicated with the interior of the buffer bin 26; When the milling cutter body 1 is cutting, the transmission spindle 9 moves downward. At this time, after the milling cutter body 1 contacts the workpiece, the milling cutter body 1 pushes the mounting shell 2 upward, so that the mounting shell 2 moves upward. As the sealing plate 25 at the lower end of the lifting and positioning column 24 moves, the lower end of the sealing plate 25 squeezes the air inside the buffer bin 26 to relieve pressure. At the same time, under the elastic force of the buffer spring 27, buffering protection is performed. In conjunction with the damping protection rod 22 between the mounting shell 2 and the mounting plate 23, the setting of the damping protection rod 22 can avoid the reciprocating vibration of the buffer spring 27, thereby achieving the effect of shock absorption protection. After the air inside the buffer bin 26 is squeezed, it is discharged through the air outlet 28, thereby achieving the effect of pressure relief, avoiding the milling cutter body 1 from being damaged by impact due to excessive downward pressure during cutting, and at the same time, when the milling cutter body 1 is cutting, it is avoided that the milling cutter body 1 is offset and damaged due to the excessive hardness of the cutting material, thereby improving the accuracy of the milling cutter cutting and ensuring high cutting accuracy.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision milling cutter with a clamping structure, comprising a milling cutter body (1) and a mounting shell (2) nested and mounted on the upper end of the milling cutter body (1), wherein the upper end of the mounting shell (2) is mounted on the lower end of a transmission spindle (9) by means of bolts; Features: A clamping block (3) is fixedly mounted on the lower end of the mounting shell (2), a portable clamping mechanism is provided on the surface of the clamping block (3), and the portable clamping mechanism is provided with a quick-clamping knob block (7), and the knob block (7) is sleeved on the outer side of the upper end of the clamping block (3); The upper end of the knob block (7) is provided with a rotating shaft (10), and the inner side of the rotating shaft (10) is provided with a secondary positioning clamping mechanism, and the secondary positioning clamping mechanism is provided with a positioning clamping clamping block (17), and the clamping block (17) is arranged inside the mounting housing (2); The upper end of the mounting shell (2) is provided with a mounting plate (23), and a protective damping mechanism for protecting the milling cutter is provided between the mounting plate (23) and the mounting shell (2), and the protective damping mechanism is provided with a damping protection rod (22), and the damping protection rod (22) is provided between the mounting shell (2) and the mounting plate (23).

2. The high-precision milling cutter with a clamping structure according to claim 1, characterized in that: The interior of the knob block (7) is threadedly connected to the knob block (7) via a threaded section (6), the bottom of the knob block (7) is open, and a stopper to prevent falling is provided at the lower end of the knob block (7).

3. The high-precision milling cutter with a clamping structure according to claim 2, characterized in that: An anti-skid protrusion (8) is arranged on the inner side of the lower end of the knob block (7), and the anti-skid protrusion (8) is arranged in an arc shape, and the anti-skid protrusion (8) corresponds to the milling cutter body (1).

4. The high-precision milling cutter with a clamping structure according to claim 1, characterized in that: The secondary positioning clamping mechanism comprises a long movable plate (11) fixedly mounted inside the rotating shaft (10), and a slide groove (12) is provided inside the mounting shell (2), and the upper end of the long movable plate (11) is located inside the slide groove (12).

5. The high-precision milling cutter with a clamping structure according to claim 4, characterized in that: A pressure plate (13) is fixedly mounted on the outer side of the long movable plate (11), and a first elastic airbag (14) is fixedly mounted on the lower end of the pressure plate (13), and the lower end of the first elastic airbag (14) is fixedly mounted inside the mounting shell (2), and an air guide tube (15) is installed through the outer side of the lower end of the first elastic airbag (14), a second elastic airbag (16) is arranged on the inner side of the upper end of the air guide tube (15), and a clamping block (17) is fixedly mounted on the inner side of the second elastic airbag (16), and the clamping block (17) corresponds to the position of a clamping groove (18) provided at the upper end of the milling cutter body (1).

6. The high-precision milling cutter with a clamping structure according to claim 5, characterized in that: Limit blocks (19) are fixedly mounted at the upper and lower ends of the engaging block (17), and the limit blocks (19) are slidably connected to limit grooves (20) provided inside the mounting shell (2), and a return spring (21) is fixedly mounted on the inner side of the limit block (19), and the inner side of the return spring (21) is fixedly mounted inside the mounting shell (2).

7. The high-precision milling cutter with a clamping structure according to claim 6, characterized in that: A positioning groove (5) is provided inside the mounting shell (2), and a positioning block (4) is fixedly mounted on the upper end of the milling cutter body (1), and the positioning block (4) and the positioning groove (5) are arranged correspondingly, and both the positioning block (4) and the positioning groove (5) are plate-shaped.

8. The high-precision milling cutter with a clamping structure according to claim 1, characterized in that: The protective damping mechanism further comprises a lifting and positioning column (24) fixedly mounted at the lower end of the mounting plate (23), a sealing plate (25) fixedly mounted at the lower end of the lifting and positioning column (24), and the sealing plate (25) fits against an inner wall of a buffer bin (26) provided inside the mounting shell (2).

9. The high-precision milling cutter with a clamping structure according to claim 8, characterized in that: Four lifting and positioning columns (24) are provided, and the lifting and positioning columns (24) are distributed at the four corners of the lower end of the mounting plate (23). A return spring (21) is provided at the lower end of the sealing plate (25), and the lower end of the return spring (21) is provided at the bottom of the buffer bin (26).

10. The high-precision milling cutter with a clamping structure according to claim 9, characterized in that: An air outlet (28) is installed through the interior of the installation shell (2), and the air outlet (28) is in communication with the interior of the buffer bin (26).

Images