Machining tool for honeycomb sandwich plate

By designing disc cutter and rail components of multi-cutting unit, combined with arc-shaped grinding sheets, the tool wear and cutting debris problems during honeycomb sandwich plate cutting is solved, achieving a longer service life and higher cutting quality.

CN120056197APending Publication Date: 2025-05-30JIANGSU HAIWO NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202510345624.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-24
Publication Date
2025-05-30

AI Technical Summary

Technical Problem

When cutting honeycomb sandwich plates, existing tools are prone to accelerate wear due to direct squeezing and collision, and it is difficult to disengage the cutting debris, which reduces the cutting quality.

Method used

A processing tool for honeycomb sandwich plates is designed, using a disc cutter consisting of multiple cutter units, each cutter unit can be moved and rotated, combining guide rail components and arc-shaped grinding sheets, relieving squeeze collisions by rotary centrifugation, and facilitating scraping and cutting debris.

Benefits of technology

The action of rotary centrifugation reduces the wear of the cutting unit and extends the service life; the arc-shaped grinding sheet effectively removes cutting debris and improves cutting quality.

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Abstract

The invention discloses a machining tool for a honeycomb sandwich plate. The machining tool comprises a disc base; the disc cutter is movably arranged on the disc seat; the circular ring seat is coaxially arranged on one end surface of the disc seat; the number of the guide rail assemblies is two, the two guide rail assemblies are arranged in parallel, and the two guide rail assemblies are both arranged on the circular ring base; wherein the disc cutter is composed of a plurality of cutter units which are evenly distributed on the circumference, each cutter unit is movably arranged on the disc base, and each cutter unit can rotate along the axis of the circular ring base; the device has the advantages of prolonging the service life, improving the cutting quality, being convenient to replace and the like.
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Description

Technical Field

[0001] The present invention relates to the technical field of honeycomb sandwich panel processing, and specifically to a processing tool for honeycomb sandwich panels. Background Art

[0002] Due to its unique structure, honeycomb sandwich panels are widely used in many fields. Existing tools mostly use sliding cutting or rotary cutting methods to cut honeycomb sandwich panels into required sizes during the cutting process. However, during the cutting process, the tool directly squeezes and collides with the honeycomb sandwich panel, lacking a buffering effect on the tool, which easily accelerates tool wear. In addition, during the cutting process, the cutting debris adhering to the tool is inconvenient to detach from the tool, thus reducing the cutting quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a processing tool for honeycomb sandwich panels, which can improve the service life and contribute to improving the cutting quality.

[0004] To solve the above technical problems, the present invention provides the following technical solution: A processing tool for honeycomb sandwich panels, comprising: a disc seat; a disc cutter, the disc cutter is movably arranged on the disc seat; a ring seat, the ring seat is coaxially arranged on one end face of the disc seat; wherein, the disc cutter is composed of a plurality of cutter units evenly distributed in the circumferential direction, each cutter unit is movably arranged on the disc seat, and each cutter unit can rotate along the axis of the ring seat.

[0005] Further, it further comprises: a guide rail assembly, there are two guide rail assemblies, the two guide rail assemblies are arranged in parallel, and both guide rail assemblies are arranged on the ring seat; a support column, a support column is rotatably arranged on each cutter unit; a guide wheel, a guide wheel is fixedly sleeved at both ends of each guide wheel; wherein, the guide wheels at both ends of the support column respectively correspond to the positions of the two guide rail assemblies, and the guide wheel is adapted to the guide rail assembly.

[0006] Further, it further comprises two circular ring guide rails, both circular ring guide rails are coaxial with the disc seat; both circular ring guide rails are arranged on the ring seat, and the two circular ring guide rails are respectively arranged in one-to-one correspondence with the two guide rail assemblies; the guide wheel is adapted to the circular ring guide rail, and each circular ring guide rail is respectively located inside the corresponding guide rail assembly.

[0007] Further, the circular ring base includes: a cylindrical portion, which is coaxial with the disc base; a first circular ring panel, which is integrally formed outside the cylindrical portion; a second circular ring panel, which is integrally formed outside the cylindrical portion; wherein, the cylindrical portion, the first circular ring panel and the second circular ring panel are coaxial, and the guide rail assembly and the circular guide rail are both arranged between the first circular ring panel and the second circular ring panel; two circular guide rails are fixedly sleeved outside the cylindrical portion, and two guide rail assemblies are respectively arranged on the first circular ring panel and the second circular ring panel.

[0008] Further, the circular ring base further includes convex columns, and a plurality of convex columns are arranged on the end face of the first circular ring panel far away from the second circular ring panel, and threaded holes are arranged on the convex columns.

[0009] Further, the guide rail assembly includes: a first arc guide rail, which is coaxial with the disc base; a second arc guide rail, which is coaxial with the first arc guide rail; a transition section, and two transition sections are connected between the first arc guide rail and the second arc guide rail.

[0010] Further, the transition section includes: a third arc guide rail, which is connected to the end of the first arc guide rail; a fourth arc guide rail, one end of the fourth arc guide rail is connected to the third arc guide rail, and the other end of the fourth arc guide rail is connected to the end of the second arc guide rail.

[0011] Further, the disc base is composed of a support ring and a bearing disc, and the support ring and the bearing disc are coaxial.

[0012] Further, a long slide bar is arranged at the middle position on one side of each cutter unit, and a plurality of long slide bars are evenly distributed in a circumferential direction along the axis of the support ring; a plurality of slide rails are arranged on the support ring, and a plurality of slide rails are evenly distributed in a circumferential direction along the axis of the support ring; the number of long slide bars is equal to that of the slide rails and they are arranged in one-to-one correspondence, and each long slide bar is arranged in cooperation with the corresponding slide rail.

[0013] Further, a sector-shaped fixing plate is arranged on the first circular ring panel, and a U-shaped seat is arranged on the sector-shaped fixing plate; an arc-shaped grinding disc is arranged on each of the sector-shaped fixing plate and the U-shaped seat, the two arc-shaped grinding discs are symmetrically arranged, and the adjacent sides of the two arc-shaped grinding discs are used for scraping the cutting debris adhered to the edge of the blade of the cutter unit.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows.

[0015] 1. Through the rotation and centrifugal action, the present invention facilitates reducing the extrusion and collision of the honeycomb clamping plate on the cutter unit when the cutter unit contacts the honeycomb sandwich panel, helps to reduce the damage to the blade part of the cutter unit, and improves its service life.

[0016] 2. The disc cutter of the present invention is composed of a plurality of cutter units, which can facilitate the replacement of one or some severely worn cutter units, and there is no need to replace the entire disc cutter.

[0017] 3. The present invention is also provided with an arc-shaped grinding disc, which can scrape the part of the cutter unit close to the blade edge, so as to facilitate scraping the cutting debris adhered to the edge of the blade of the cutter unit, thereby contributing to improving the cutting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of the present invention from another angle.

[0021] Figure 3 It is a schematic diagram of the positions of the guide rail assembly and the circular guide rail of the first embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of the overall sectional structure of the first embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the cooperation between the guide wheel and the guide rail assembly and the circular guide rail of the first embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the overall structure of the second embodiment of the present invention.

[0025] Figure 7 It is a schematic diagram of the overall structure of the second embodiment of the present invention from another angle.

[0026] Figure 8 It is a schematic diagram of the cooperation between the arc-shaped grinding disc and the cutter unit of the second embodiment of the present invention.

[0027] Figure 9 It is a schematic diagram of the structure of the disc seat of the third embodiment of the present invention.

[0028] Figure 10 It is a schematic diagram of the structure of the ring seat of the third embodiment of the present invention.

[0029] In the figure: 1. Disc cutter; 11. Cutter unit; 2. Disc seat; 21. Support ring; 22. Bearing disc; 221. Mounting hole; 3. Ring seat; 31. Cylindrical part; 32. First ring panel; 321. Convex column; 3211. Threaded hole; 33. Second ring panel; 4. Guide rail assembly; 41. First arc guide rail; 42. Second arc guide rail; 43. Transition section; 431. Third arc guide rail; 432. Fourth arc guide rail; 5. Circular ring guide rail; 6. Long slide bar; 61. Slide rail; 7. Support column; 71. Guide wheel; 8. Sector fixing plate; 81. U-shaped seat; 9. Arc grinding disc; 91. Fillet transition. Detailed implementation manner

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] Please refer to Figures 1 - 5 , the present invention provides a technical solution: a processing tool for a honeycomb sandwich panel, including a disc seat 2 and a ring seat 3 arranged on one end face of the disc seat 2, and the ring seat 3 and the disc seat 2 are coaxial; a disc cutter 1 is movably arranged on the ring seat 3, and the disc cutter 1 is composed of a plurality of cutter units 11 evenly distributed in a circumferential manner, and each cutter unit 11 is movably arranged on the ring seat 3.

[0033] The tool further includes two parallel guide rail assemblies 4 and two parallel circular ring guide rails 5, and the two circular ring guide rails 5 are respectively arranged in one-to-one correspondence with the two guide rail assemblies 4, and the two guide rail assemblies 4 and the two circular ring guide rails 5 are all arranged on the ring seat 3; the two circular ring guide rails 5 are both coaxial with the disc seat 2, and each guide rail assembly 4 is located outside the corresponding circular ring guide rail 5; a support column 7 is rotatably arranged on the cutter unit 11. Specifically, the support column 7 is movably connected to the cutter unit 11 through a bearing, and the support column 7 is close to the end of the cutter unit 11 where no cutting edge is provided; guide wheels 71 are fixedly sleeved at both ends of the support column 7, and the two guide wheels 71 are respectively arranged in one-to-one correspondence with the two guide rail assemblies 4, and the guide wheels 71 are adapted to the guide rail assemblies 4 and the circular ring guide rails 5, and each guide wheel 71 is located between the corresponding guide rail assembly 4 and the circular ring guide rail 5; in addition, each cutter unit 11 is located between the two guide rail assemblies 4, and the cutter unit 11 does not contact the guide rail assemblies 4.

[0034] The circular ring seat 3 is composed of a cylindrical part 31, a first circular ring panel 32 and a second circular ring panel 33 integrally formed outside the cylindrical part 31. The first circular ring panel 32, the second circular ring panel 33, the cylindrical part 31 and the disc seat 2 are coaxial; the guide rail assembly 4 and the circular guide rail 5 are both arranged between the first circular ring panel 32 and the second circular ring panel 33; among them, the two guide rail assemblies 4 are respectively arranged on the first circular ring panel 32 and the second circular ring panel 33, and the two circular guide rails 5 are fixedly sleeved outside the cylindrical part 31.

[0035] The guide rail assembly 4 includes a first arc guide rail 41 and a second arc guide rail 42 arranged coaxially. The first arc guide rail 41 and the second arc guide rail 42 are both coaxial with the cylindrical part 31; two transition sections 43 are arranged between the first arc guide rail 41 and the second arc guide rail 42. The transition sections 43 are arranged between the ends of the first arc guide rail 41 and the second arc guide rail 42, and the two first arc guide rails 41, the two second arc guide rails 42 and the two transition sections 43 are spliced to form a closed structure; at the same time, the transition section 43 is composed of a third arc guide rail 431 and a fourth arc guide rail 432. The third arc guide rail 431 is connected to the end of the first arc guide rail 41. One end of the fourth arc guide rail 432 is connected to the third arc guide rail 431, and the other end of the fourth arc guide rail 432 is connected to the end of the second arc guide rail 42; in addition, the radius of the arc surface of the first arc guide rail 41 adapted to the outer ring surface of the guide wheel 71 is smaller than the radius of the arc surface of the second arc guide rail 42 adapted to the outer ring surface of the guide wheel 71, and the distance between the arc surface of the first arc guide rail 41 adapted to the outer ring surface of the guide wheel 71 and the arc surface of the second arc guide rail 42 adapted to the outer ring surface of the guide wheel 71 is greater than the outer ring diameter of the guide wheel 71, and this distance can be set to 1-1.5 times the outer ring diameter of the guide wheel 71.

[0036] The first arc guide rail 41 is located directly above the second arc guide rail 42. The first arc guide rail 41 and the second arc guide rail 42 are both located outside the cylindrical part 31; the middle position of the second arc guide rail 42 is located directly below the bottom end of the cylindrical part 31, and the two transition sections 43 are symmetrically arranged at both ends of the second arc guide rail 42. The first arc guide rail 41 is tangent to the third arc guide rail 431, and the fourth arc guide rail 432 is tangent to both the third arc guide rail 431 and the second arc guide rail 42; at the same time, when the guide wheel 71 is located between the circular guide rail 5 and the first arc guide rail 41, the guide wheel 71 cooperates with the circular guide rail 5, and at the same time the guide wheel 71 also cooperates with the first arc guide rail 41, that is, the guide wheel 71 is just limited between the circular guide rail 5 and the first arc guide rail 41.

[0037] In this embodiment, the disc base 2 includes a supporting ring 21, and the supporting ring 21 is coaxial with the cylindrical portion 31; a plurality of slide rails 61 are evenly distributed on one end face of the supporting ring 21, and the plurality of slide rails 61 are evenly distributed circumferentially along the axis of the supporting ring 21; the number of the slide rails 61 is equal to the number of the cutter units 11, and a long slide bar 6 is arranged at the middle position of each cutter unit 11, and each long slide bar 6 corresponds to the position of each slide rail 61, and each long slide bar 6 is respectively arranged on the corresponding slide rail 61 in a matching manner; the length directions of each long slide bar 6 and the slide rail 61 are along one radius direction of the outer ring surface of the supporting ring 21; the supporting ring 21 is close to the second ring panel 33, but the supporting ring 21 does not contact the second ring panel 33, and the inner ring surface diameter of the supporting ring 21 is larger than the outer ring surface of the second ring panel 33; a bearing disc 22 is coaxially arranged on the end face of the supporting ring 21 away from the slide rail 61, and the bearing disc 22 is used for connecting with an external driving rotating shaft, and the external driving rotating shaft is coaxial with the bearing disc 22, so as to drive the whole disc base 2 to rotate at a high speed around its own axis, and further drive each cutter unit 11 to rotate at a high speed, so as to achieve the cutting effect.

[0038] In addition, in this embodiment, the ring base 3 is used for fixing. Specifically, the ring base 3 is used for fixing on the equipment matched with the cutter; during the rotation of the cutter unit 11, due to the cooperation of the long slide bar 6 and the slide rail 61, the cutter unit 11 can move along the radial direction of the supporting ring 21. Depending on the centrifugal force during the rotation, when the guide wheel 71 moves to the transition section 43 between the circular arc guide rail 42 and the circular guide rail 5, the cutter unit 11 can move outwards by relying on the centrifugal motion. At the same time, depending on the centrifugal force, when the guide wheel 71 is located between the second circular arc guide rail 42 and the circular guide rail 5, the guide wheel 71 can cooperate with the second circular arc guide rail 42; since the second circular arc guide rail 42 is located directly below the bottom of the cylindrical portion 31, that is, the cutter unit 11 moving to correspond to the circular guide rail 5 is used for cutting the honeycomb sandwich panel; during the cutting of the honeycomb sandwich panel, the supporting ring 21 drives the cutter unit 11 to rotate at a high speed, and the centrifugal force is used to enable the cutter unit 11 to move outwards, which is convenient for reducing the extrusion and collision of the honeycomb sandwich panel on the cutter unit 11 when the cutter unit 11 contacts the honeycomb sandwich panel, contributing to reducing the damage to the blade part of the cutter unit 11 and improving its service life; at the same time, when the cutter unit 11 contacts the honeycomb sandwich panel, the acting force of the honeycomb sandwich panel on the cutter unit 11 can only offset a very small part of the centrifugal force generated by the high-speed rotation of the cutter unit 11, and does not affect the normal cutting of the cutter unit 11.

[0039] In this embodiment, the disc cutter 1 is composed of a plurality of cutter units 11, and the long slide bar 6 can be fixedly connected with the cutter unit 11 by screws, so it is convenient to replace one or some cutter units 11 with serious wear without replacing the whole disc cutter 1.

[0040] Example 2

[0041] Please refer to Figures 1 - 8 , based on Example 1, a sector-shaped fixing plate 8 is fixedly arranged on the outer ring surface of the circular ring panel 1, and a U-shaped seat 81 is arranged on the sector-shaped fixing plate 8; an arc-shaped grinding plate 9 is arranged on both the sector-shaped fixing plate 8 and the U-shaped seat 81, and the two arc-shaped grinding plates 9 are symmetrically arranged; the two arc-shaped grinding plates 9 are used for scraping the part of the cutting tool unit 11 near the cutting edge after cutting, so as to facilitate scraping the cutting debris adhered to the vicinity of the cutting edge of the cutting tool unit 11.

[0042] Specifically, as Figure 7 shown, the rotation direction of the cutting tool unit 11 is counterclockwise, the bottom end of the arc-shaped grinding plate 9 corresponds to the position of the circular arc guide rail four 432 at the right end, and the distance between the two arc-shaped grinding plates 9 is slightly larger than the thickness of the cutting tool unit 11; the arc-shaped grinding plate 9 can specifically be made of materials such as nylon; when the cutting tool unit 11 moves from the circular arc guide rail four 432 at the right end to the circular arc guide rail one 41, under the combined action of the guide wheel 71 and the circular arc guide rail one 41 and the circular ring guide rail 5, the cutting tool unit 11 is urged to move towards the direction close to the axis of the cylindrical part 31. During the movement of the cutting tool unit 11, it is convenient to lift the two arc-shaped grinding plates 9 to scrape both sides of the cutting tool unit 11, so as to help scrape off the cutting debris adhered to the vicinity of the cutting edge of the cutting tool unit 11, thereby improving the cutting quality; of course, the debris accumulated on the arc-shaped grinding plate 9 needs to be cleaned in time after the machine stops; at the same time, a fillet transition 91 is arranged at the bottom end of the arc-shaped grinding plate 9. By arranging the fillet transition 91, it is convenient to guide the cutting tool unit 11 between the two arc-shaped grinding plates.

[0043] Example 3

[0044] Please refer to Figure 9 、 Figure 10 , based on Example 1, an installation hole 221 for connecting with an external driving rotating shaft is arranged at the center of the bearing disc 22; in addition, a plurality of convex columns 321 are arranged on the end surface of the circular ring panel 1 away from the circular ring panel 2. The convex columns 321 can be integrally formed on the circular ring panel 1, and a threaded hole 3211 is arranged on each convex column 321. Through the threaded hole 3211, it is convenient to install and fix the circular ring panel 1, so as to facilitate the installation and fixation of the entire circular ring seat 3.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A processing tool for a honeycomb sandwich panel, comprising: Disc seat (2); A disc cutter (1), the disc cutter (1) being movably arranged on a disc seat (2); A circular ring seat (3), the circular ring seat (3) is coaxially arranged on one end surface of the disc seat (2); The disc cutter (1) is composed of a plurality of cutter units (11) evenly distributed around the circumference, each cutter unit (11) is movably arranged on the disc seat (2), and each cutter unit (11) is rotatable along the axis of the annular seat (3).

2. A processing tool for honeycomb sandwich panels according to claim 1, characterized in that: Also includes: A guide rail assembly (4), wherein the guide rail assembly (4) comprises two guide rail assemblies (4), the two guide rail assemblies (4) are arranged in parallel, and the two guide rail assemblies (4) are both arranged on the circular ring seat (3); A support column (7), each cutting unit (11) is rotatably provided with a support column (7); Guide wheels (71), each guide wheel (71) having a guide wheel (71) fixedly sleeved on both ends thereof; The guide wheels (71) at both ends of the support column (7) correspond to the positions of the two guide rail assemblies (4) respectively, and the guide wheels (71) are adapted to the guide rail assemblies (4).

3. A processing tool for honeycomb sandwich panels according to claim 2, characterized in that: It also includes two annular guide rails (5), and the two annular guide rails (5) are coaxial with the disc seat (2); The two annular guide rails (5) are both arranged on the annular seat (3), and the two annular guide rails (5) are respectively arranged in a one-to-one correspondence with the two guide rail assemblies (4); The guide wheel (71) is matched with the annular guide rail (5), and each annular guide rail (5) is located inside the corresponding guide rail assembly (4).

4. A processing tool for honeycomb sandwich panels according to claim 3, characterized in that: The annular seat (3) comprises: A cylindrical portion (31), the cylindrical portion (31) and the disc seat (2) are coaxial; A circular ring panel (32), wherein the circular ring panel (32) is integrally formed and arranged outside the cylindrical portion (31); The second circular panel (33) is integrally formed and arranged outside the cylindrical portion (31); The cylindrical portion (31), the annular panel 1 (32) and the annular panel 2 (33) are coaxial, and the guide rail assembly (4) and the annular guide rail (5) are both arranged between the annular panel 1 (32) and the annular panel 2 (33); Two annular guide rails (5) are fixedly sleeved on the outside of the cylindrical portion (31), and two guide rail assemblies (4) are respectively arranged on the annular panel 1 (32) and the annular panel 2 (33).

5. A processing tool for honeycomb sandwich panels according to claim 4, characterized in that: The annular seat (3) further comprises a convex column (321). A plurality of convex columns (321) are arranged on an end surface of the annular panel 1 (32) away from the annular panel 2 (33). The convex columns (321) are provided with threaded holes (3211).

6. A processing tool for honeycomb sandwich panels according to claim 4, characterized in that: The guide rail assembly (4) comprises: A circular arc guide rail 1 (41), wherein the circular arc guide rail 1 (41) is coaxial with the disc seat (2); The second circular arc guide rail (42) is coaxial with the first circular arc guide rail (41); Transition section (43), two transition sections (43) are connected between the circular arc guide rail 1 (41) and the circular arc guide rail 2 (42).

7. A processing tool for honeycomb sandwich panels according to claim 6, characterized in that: The transition section (43) comprises: Arc guide rail three (431), arc guide rail three (431) is connected to the end of arc guide rail one (41); Arc guide rail four (432), one end of which is connected to arc guide rail three (431), and the other end of which is connected to the end of arc guide rail two (42).

8. A processing tool for honeycomb sandwich panels according to claim 1, characterized in that: The disc seat (2) is composed of a supporting ring (21) and a bearing disc (22), and the supporting ring (21) and the bearing disc (22) are coaxial.

9. A processing tool for honeycomb sandwich panels according to claim 8, characterized in that: A long slide bar (6) is arranged at the middle position of one side of each cutting unit (11), and a plurality of long slide bars (6) are evenly distributed along the circumference of the axis of the supporting ring (21); A plurality of slide rails (61) are arranged on the supporting ring (21), and the plurality of slide rails (61) are evenly distributed along the circumference of the axis of the supporting ring (21); The number of the long slide bars (6) and the slide rails (61) are equal and they are arranged in a one-to-one correspondence, and each long slide bar (6) is arranged on the corresponding slide rail (61).

10. A processing tool for honeycomb sandwich panels according to claim 4, characterized in that: A sector-shaped fixing plate (8) is arranged on the first circular panel (32), and a U-shaped seat (81) is arranged on the sector-shaped fixing plate (8); An arc-shaped grinding disc (9) is respectively arranged on the fan-shaped fixing plate (8) and the U-shaped seat (81), and the two arc-shaped grinding discs (9) are symmetrically arranged, and the adjacent sides of the two arc-shaped grinding discs (9) are used to scrape the cutting debris adhered to the edge of the blade of the cutting unit (11).