Grinding structure and milling machine
By designing a protective boot assembly and a grinding assembly into the grinding structure, the problem of low efficiency caused by the small torque of the grinding head was solved, achieving efficient skull bone flap grinding and simplifying the surgical procedure.
Patent Information
- Application Number
- CN202422911415.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-11-27
AI Technical Summary
The existing grinding heads provide relatively low torque, resulting in low grinding efficiency of the grinding tools and increasing the complexity and time of the operation.
Design a grinding structure including a protective shoe assembly and a grinding assembly. The protective shoe assembly is connected to the milling handle, and the grinding assembly is driven to the power assembly through a guide hole, providing additional protection and ensuring efficient power transmission.
It improves grinding efficiency, reduces wear during the grinding process, shortens surgical time, and enhances surgical outcomes.
Smart Images
Figure CN223731452U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a grinding structure and a milling machine. Background Technology
[0002] In neurosurgery, the removal, reshaping, and repair of skull bone flaps are common procedures, especially during craniotomy to treat intracranial diseases or injuries. The reshaping and repair of skull bone flaps require high precision and stable operation to ensure patient safety and postoperative recovery.
[0003] Currently, conventional grinding tools are commonly used to grind skull flaps. However, conventional grinding heads provide relatively low torque during grinding, resulting in low grinding efficiency. When performing fine grinding of skull flaps, surgeons require more time and effort, which not only increases the complexity of the surgery but may also affect the surgical outcome. Utility Model Content
[0004] The main purpose of this invention is to propose a grinding structure and a milling machine, which aims to solve the problem that the existing grinding heads provide relatively low torque, resulting in low tool grinding efficiency.
[0005] To achieve the above objectives, the present invention proposes a grinding structure for mounting on a milling handle. The milling handle has a mounting interface, and a power assembly is located inside the milling handle. The grinding structure includes:
[0006] A boot protector assembly, wherein one end of the boot protector assembly is provided with a mounting connector adapted to the mounting interface, the mounting connector being detachably connected to the mounting interface, and the other end of the boot protector assembly is provided with a boot foot, the boot foot having a through-hole; and
[0007] A polishing assembly, one end of which passes through the mounting interface and is driven to the power assembly, and the other end of which extends through the guide hole to the boot assembly for polishing.
[0008] In one embodiment, the polishing assembly includes:
[0009] A grinding rod, one end of which passes through the mounting interface and is driven by the power assembly, and the other end of which extends out of the boot assembly through the guide hole; and
[0010] A grinding disc is located at the other end of the grinding rod, and the grinding disc is located outside the boot assembly for grinding.
[0011] In one embodiment, the grinding disc includes a disc body and a grinding blade, the disc body being connected to the other end of the grinding rod, and the grinding blade being disposed on the outer periphery of the disc body.
[0012] In one embodiment, a plurality of grinding blades are spaced apart, and the plurality of grinding blades are arranged circumferentially along the outside of the disc body.
[0013] In one embodiment, the disc body has a first end face and a second end face that are opposite to each other. Both the first end face and the second end face are perpendicular to the grinding blade. Alternatively, the angle between the grinding blade and the first end face and the angle between the grinding blade and the second end face are both acute angles.
[0014] In one embodiment, the grinding disc includes a disc body, and the outer periphery of the disc body is provided with an abrasive portion for grinding.
[0015] In one embodiment, the boot protection assembly includes a boot body having opposing front and rear ends, the rear end being provided with the mounting joint, the polishing assembly extending from the front end to the rear end and being drivenly connected to the power assembly; the front end is provided with the boot foot portion, and the polishing assembly is rotatably disposed in the guide through hole.
[0016] In one embodiment, the grinding structure further includes a first bearing, which is disposed between the grinding assembly and the guide hole, and the outer ring of the first bearing is connected to the guide hole, and the inner ring of the first bearing rotates synchronously with the grinding assembly.
[0017] In one embodiment, the rear end is provided with a mounting groove, which is opened on the side of the boot body facing the milling handle; the boot protection assembly also includes a support sleeve, which is sleeved on the outer periphery of the grinding assembly, and one end of the support sleeve is detachably disposed in the mounting groove, and the other end of the support sleeve is detachably connected to the milling handle.
[0018] In one embodiment, the boot assembly further includes a second bearing disposed within the mounting groove, the second bearing being sleeved on the outer periphery of the grinding assembly and abutting against the support sleeve.
[0019] In one embodiment, the boot protector assembly further includes a limiting sleeve, the bottom of the mounting groove forms a limiting step, and the limiting sleeve is fitted around the outer periphery of the polishing assembly and abuts against the limiting step.
[0020] This utility model also proposes a milling machine, the milling machine comprising:
[0021] A milling handle, wherein a power component is internally located, and a mounting interface is provided on the milling handle; and
[0022] The grinding structure as described in any of the above embodiments is detachably mounted to the mounting interface.
[0023] The technical solution of this utility model involves setting an installation joint on the protective shoe assembly in the grinding structure, and configuring the installation joint to be compatible with the installation interface on the milling handle of an existing milling machine. This allows for quick installation and disassembly of the grinding structure from the milling handle. The grinding structure includes a protective shoe assembly and a grinding assembly. One end of the protective shoe assembly, with the installation joint, is connected and fixed to the milling handle. The other end of the protective shoe assembly has a shoe foot with a guide hole. One end of the grinding assembly passes through the guide hole for grinding. The protective shoe provides additional protection for the grinding assembly, reducing direct wear on the grinding assembly during grinding. The other end of the grinding assembly passes through the installation interface and is connected to the power assembly inside the milling handle, ensuring efficient power transmission during the grinding process and improving grinding efficiency. In this solution, after the milling machine completes the cutting action on the target part, the milling cutter can be removed from the milling handle. Then, the grinding structure is installed on the milling handle for fine grinding. The milling handle provides a larger rotational torque, thereby improving grinding efficiency and solving the defects of traditional grinding tools such as low torque, low efficiency, and long operation time. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0025] Figure 1 A schematic diagram of an embodiment of the grinding structure provided by this utility model;
[0026] Figure 2 A schematic diagram of another embodiment of the grinding structure provided by this utility model;
[0027] Figure 3 A schematic diagram of the grinding component in another embodiment of the grinding structure provided by this utility model;
[0028] Figure 4 A partial structural schematic diagram of the grinding component in another embodiment of the grinding structure provided by this utility model;
[0029] Figure 5 A partial structural schematic diagram of the grinding component in another embodiment of the grinding structure provided by this utility model;
[0030] Figure 6 A top view of the grinding disc of a grinding assembly in another embodiment of the grinding structure provided by this utility model;
[0031] Figure 7A cross-sectional view of another embodiment of the grinding structure provided by this utility model;
[0032] Figure 8 A schematic diagram of the boot protector assembly in another embodiment of the grinding structure provided by this utility model;
[0033] Figure 9 A partial structural schematic diagram of an embodiment of the milling machine provided by this utility model.
[0034] Explanation of icon numbers:
[0035] 100. Grinding structure; 01. Target part; 1. Boot assembly; 11. Boot body; 111. Mounting joint; 112. Guide hole; 113. Mounting groove; 12. Support sleeve; 13. Second bearing; 14. Limiting sleeve; 2. Grinding assembly; 21. Grinding rod; 22. Grinding disc; 221. Disc body; 222. Grinding edge; 223. Abrasive part; 3. First bearing;
[0036] 200. Milling machine; 201. Milling handle.
[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0041] Currently, conventional burrs are commonly used to grind skull bone flaps. However, conventional burrs provide relatively low torque during the grinding process, resulting in low grinding efficiency. When performing fine grinding of skull bone flaps, surgeons require more time and effort to complete the operation, which not only increases the complexity of the surgery but may also affect the surgical outcome.
[0042] This utility model proposes a grinding structure for mounting on a milling handle. The milling handle has a mounting interface and a power component inside.
[0043] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the grinding structure 100 includes:
[0044] The boot assembly 1 has a mounting connector 111 at one end that is adapted to the mounting interface. The mounting connector 111 is detachably connected to the mounting interface. The other end of the boot assembly 1 has a boot foot with a guide hole 112 extending through it.
[0045] Grinding component 2, one end of grinding component 2 passes through the mounting interface and is connected to the power component for drive, and the other end of grinding component 2 passes through the guide hole 112 and extends out of the protective boot component 1 for grinding.
[0046] The technical solution of this utility model involves setting an installation connector 111 on the protective shoe assembly 1 in the grinding structure 100, and setting the installation connector 111 to be compatible with the installation interface on the milling handle 201 of the existing milling machine 200, so that the grinding structure 100 can be quickly installed and disassembled with the milling handle 201. The grinding structure 100 includes a protective shoe assembly 1 and a grinding assembly 2. After one end of the protective shoe assembly 1 with the installation connector 111 is connected and fixed to the milling handle 201, the other end of the protective shoe assembly 1 has a shoe foot, and a guide hole 112 is opened on the shoe foot. One end of the grinding assembly 2 passes through the guide hole 112 for grinding. The setting of the protective shoe provides additional protection for the grinding assembly 2 and reduces direct wear on the grinding assembly 2 during the grinding process. The other end of the grinding assembly 2 passes through the installation interface and is driven and connected to the power assembly inside the milling handle 201, ensuring efficient power transmission in the grinding process and improving grinding efficiency. In this solution, after the milling machine 200 completes the cutting action on the target part 01, the milling cutter can be removed from the milling handle 201. Then, the grinding structure 100 is installed on the milling handle 201 for fine grinding. The milling handle 201 provides a larger rotational torque, thereby improving grinding efficiency and solving the defects of traditional grinding tools such as small torque, low efficiency and long operation time.
[0047] Specifically, the shapes of the mounting interface on the milling handle 201 and the mounting connector 111 on the boot assembly 1 are not specifically limited, as long as they are mutually compatible connection structures. For example, it can be a combination of a slot and a fork, or a combination of a snap and a groove. In other words, by using an existing milling handle 201 and installing and switching the milling cutter and the grinding structure 100, both milling and grinding actions can be achieved. The power component inside the milling handle 201 can be an electric motor or a pneumatic motor, etc., which is not limited here, as long as it is a power structure that can provide a large rotational torque to the grinding assembly 2. In this embodiment, the structure of the boot assembly 1 is not specifically limited. For example, it can be tubular or cover-shaped, as long as it can fix the grinding assembly 2 and connect it to the milling handle 201. In addition, the structure of the grinding assembly 2 is not specifically limited. The cutter head can be provided with parallel cutting edges, arc cutting edges, or diamond cutting edges, etc., which can be selected according to actual needs to facilitate planar grinding or circular grinding of skull bone flaps.
[0048] In the embodiments of this utility model, please refer to Figure 3 The polishing component 2 includes:
[0049] Grinding rod 21, one end of which passes through the mounting interface and is driven by the power assembly, and the other end of which passes through the guide hole 112 and extends out of the protective boot assembly 1; and
[0050] The grinding disc 22 is located at the other end of the grinding rod 21. The grinding disc 22 is located outside the boot protector assembly 1 and is used for grinding.
[0051] Specifically, the grinding assembly 2 includes a grinding rod 21 and a grinding disc 22. One end of the grinding rod 21 passes through the mounting interface and connects to the power assembly inside the milling handle 201. The other end of the grinding rod 21 passes through the guide hole 112. The protective boot assembly 1 can fix the grinding rod 21 in the axial direction, improve the connection strength of the grinding rod 21, and prevent bending deformation or breakage under high-speed rotation. In this way, even if the grinding rod 21 is long enough, it can still ensure that the grinding rod 21 has strong axial fixing strength, ensuring the normal operation of the grinding rod 21. It should be noted that the shape of the grinding disc 22 is not specifically limited, as long as it can serve the purpose of grinding the skull flap. The grinding disc 22 can be a cylinder, with a grinding layer or cutting layer such as diamond abrasive coated around its perimeter, thereby performing fine grinding or cutting of the skull flap; the grinding disc 22 can also be a prism, with sharp cutting edges at several edges of the prism to facilitate grinding or cutting the skull flap to the desired shape. During the specific installation process, the grinding rod 21 can be first passed through the protective boot assembly 1 and installed at the installation interface. Then, the grinding disc 22 can be fitted onto the other end of the grinding rod 21. The grinding disc 22 can be fixed to the grinding rod 21 by threaded connection or snap-fit connection.
[0052] In the embodiments of this utility model, please refer to Figure 3 , Figure 4 and Figure 6 The grinding disc 22 includes a disc body 221 and a grinding edge 222. The disc body 221 is connected to the other end of the grinding rod 21, and the grinding edge 222 is located on the outer periphery of the disc body 221. The rotation of the disc body 221 allows for better transmission of the grinding force from the disc body 221 to the grinding edge 222, ensuring efficient transmission of the grinding force and improving grinding efficiency. It should be noted that the grinding edge 222 is made of highly wear-resistant materials such as metal alloys or ceramics, enabling it to maintain a long service life even under friction, impact, and high-pressure environments. Furthermore, the shape of the grinding edge 222 is not specifically limited; spiral inserts or curved inserts can be selected according to actual needs.
[0053] In the embodiments of this utility model, the disc body 221 and the grinding blade 222 can be made of stainless steel bar material, which is first turned, then ground and finally toothed and sharpened, or electroplated with diamond and other processes. This reduces the assembly steps between the two components, making the overall structure more robust. The grinding disc 22 can withstand greater working load and grinding pressure and is not easily deformed.
[0054] Optionally, please refer to Figure 3 and Figure 6Multiple grinding edges 222 are spaced apart and arranged circumferentially along the outer side of the disc body 221. The grinding edges 222 can be oblique edges, parallel edges, dotted edges, or annular edges, etc. The grinding edges 222 are arranged in a specific circumferential array pattern, such as an equal-angle array, an equal-arc-length array, or a spiral array, ensuring that the grinding edges 222 are evenly distributed. This guarantees uniform grinding force during the grinding process and avoids damage to the target part 01 or a decrease in grinding quality due to uneven grinding.
[0055] In an embodiment of this utility model, the disk body 221 has a first end face and a second end face that are opposite to each other. Please refer to [link / reference]. Figure 4 Both the first and second end faces are perpendicular to the grinding edge 222, meaning that the two ends of the grinding edge 222 are perpendicular to the two end faces respectively, forming a straight cutting edge. (See also...) Figure 3 The angles between the grinding edge 222 and the first end face, and between the grinding edge 222 and the second end face, are both acute angles. This means that the grinding edge 222 is not parallel to the axis of the disc body 221, and the angles between it and both end faces of the disc body 221 are acute, forming a beveled edge. This can be used for side grinding or profile grinding. Both straight and beveled cutting tips have straight cutting edges, suitable for coarse grinding over large areas, and are primarily suitable for adults without osteoporosis. In actual operation, the beveled edge is more ergonomic and smoother to use.
[0056] In the embodiments of this utility model, please refer to Figure 5 The grinding disc 22 includes a disc body 221, with an abrasive section 223 on the outer periphery of the disc body 221. The abrasive section 223 is used for grinding the target part 01. The abrasive section 223 can be made of materials such as diamond, silicon carbide, glass beads, or zirconium oxide, thereby performing fine grinding on small areas of skull flaps. It is mainly used for skulls of children or the elderly with osteoporosis. This is because the osteoporotic skull structure is relatively brittle, and using diamond for fine grinding is safer.
[0057] In the embodiments of this utility model, please refer to Figure 7 The boot protection assembly 1 includes a boot body 11, which has a front end and a rear end. The rear end has a mounting connector 111. The grinding assembly 2 extends from the front end to the rear end and is driven by a power assembly. Optionally, the boot body 11 may include a boot foot, a boot shaft, and a boot cap. The boot foot and boot cap are connected by the boot shaft. The boot cap has a mounting connector 111 (such as a protrusion or a fork), and the boot foot has a fixing hole for the grinding assembly 2 to pass through, thus providing external protection for the grinding assembly 2. Furthermore, the design of the boot foot and boot cap provides multi-point support for the grinding assembly 2, thereby improving the connection strength of the grinding assembly 2.
[0058] In the embodiments of this utility model, please refer to Figure 8 The front end is provided with a boot-like part, on which a guide hole 112 is formed. The grinding component 2 is rotatably positioned within the guide hole 112. The guide hole 112 can be circular, square, or triangular, etc., and is not specifically limited here, as long as its shape is compatible with the exterior of the grinding component 2. The guide hole 112 provides a precise positioning path for the grinding component 2, preventing it from accidentally disengaging during high-speed operation and ensuring the safety of the grinding process.
[0059] In the embodiments of this utility model, please refer to Figure 7 The grinding structure 100 also includes a first bearing 3, which is located between the grinding assembly 2 and the guide hole 112. The first bearing 3 reduces friction between the grinding assembly 2 and the guide hole 112, reducing wear and allowing the grinding assembly 2 to withstand larger radial loads, thus extending its service life. The outer ring of the first bearing 3 can have a clearance fit or an interference fit with the guide hole 112, providing stable support for the grinding assembly 2. The inner ring of the first bearing 3 can have a small clearance fit or a zero clearance fit with the grinding assembly 2, ensuring synchronous rotation and precise movement of the grinding assembly 2 within the guide hole 112. The first bearing 3 can be a ball bearing, roller bearing, or other oil-impregnated bearing, etc., without specific limitations.
[0060] In the embodiments of this utility model, please refer to Figure 7 The rear end of the shoe assembly 11 is provided with a mounting groove 113, which is located on the side of the shoe body 11 facing the milling handle 201. The shoe assembly 1 also includes a support sleeve 12, which is fitted around the outer periphery of the grinding assembly 2. One end of the support sleeve 12 is detachably located in the mounting groove 113, and the other end of the support sleeve 12 is detachably connected to the milling handle 201. The mounting groove 113 can be a square groove or an arc groove, etc., as long as the shape is compatible with the outer periphery of the support sleeve 12. By setting the mounting groove 113 at the rear end of the shoe body 11, there is an installation space inside the shoe body 11 for installing the support sleeve 12. The support sleeve 12 can be connected to the shoe body 11 by means of threaded connection or snap-fit, etc., and is fitted around the outer periphery of the grinding assembly 2, thereby providing axial support force for the grinding assembly 2 and enhancing the stability of the overall structure.
[0061] In the embodiments of this utility model, please refer to Figure 7The protective boot assembly 1 also includes a second bearing 13, which is disposed within the mounting groove 113 and sleeved on the outer periphery of the grinding assembly 2, abutting against the support sleeve 12. Understandably, the outer ring of the second bearing 13 is fixed within the mounting groove 113, and can have either a clearance fit or an interference fit with the groove wall. The inner ring of the second bearing 13 has a small clearance fit or a zero clearance fit with the grinding assembly 2, allowing both to rotate synchronously. The second bearing 13, sleeved on the outer periphery of the grinding assembly 2, increases the rotational support point of the protective boot assembly 1 for the grinding assembly 2, effectively reducing friction between the grinding assembly 2 and the support sleeve 12, and reducing wear. The second bearing 13 can be a ball bearing, roller bearing, or other oil-impregnated bearing, etc., and is not specifically limited here.
[0062] In the embodiments of this utility model, please refer to Figure 7 The boot protector assembly 1 also includes a limiting sleeve 14. A limiting step is formed at the bottom of the mounting groove 113. The limiting sleeve 14 is fitted onto the outer periphery of the grinding assembly 2 and abuts against the limiting step. By providing a positioning structure such as a limiting step within the mounting groove 113 and fitting the limiting sleeve 14 onto the outside of the grinding assembly 2, the limiting sleeve 14 can be quickly and effectively fixed through the cooperation of the limiting sleeve 14 and the limiting step. This axially limits the grinding assembly 2, preventing axial displacement during grinding and thus ensuring the smooth progress of the grinding work.
[0063] This utility model also proposes a milling machine 200, which includes a milling handle 201 and a grinding structure 100. The specific structure of the grinding structure 100 is as described in the above embodiments. Since this milling machine 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Please refer to... Figure 9 The milling handle 201 contains a power assembly and a mounting interface. The grinding structure 100 is detachably mounted to the mounting interface. The structure of the milling handle 201 is not specifically limited; any handle structure commonly used in the art is acceptable.
[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A grinding structure for mounting on a milling handle, said milling handle being provided with a mounting interface, and said milling handle being provided with a power assembly inside, characterized in that, The grinding structure comprises: A boot assembly, one end of the boot assembly is provided with a mounting joint matched with the mounting interface, the mounting joint is detachably connected with the mounting interface, the other end of the boot assembly is provided with a boot foot, and a guide through hole is formed through the boot foot. A polishing assembly, one end of the polishing assembly is drivingly connected with the power assembly through the mounting interface, and the other end of the polishing assembly extends out of the boot assembly through the guide through hole for polishing.
2. The grinding structure of claim 1, wherein, The polishing assembly comprises: A grinding rod, one end of the grinding rod is drivingly connected with the power assembly through the mounting interface, and the other end of the grinding rod extends out of the boot assembly through the guide through hole; and A grinding disc, provided at the other end of the grinding rod, the grinding disc is located outside the boot assembly for polishing.
3. The grinding structure of claim 2, wherein, The grinding disc comprises a disc body and grinding edges, the disc body is connected to the other end of the grinding rod, and the grinding edges are provided on the outer periphery of the disc body.
4. The grinding structure of claim 3, wherein, The grinding edges are spaced apart, and a plurality of the grinding edges are arranged in a circumferential direction along the outer periphery of the disc body; and / or, The disc body has a first end face and a second end face facing away from each other, and the first end face and the second end face are both arranged perpendicularly to the grinding edges, or the included angle between the grinding edges and the first end face and the included angle between the grinding edges and the second end face are both acute angles.
5. The grinding structure of claim 2, wherein, The grinding disc comprises a disc body, and the outer periphery of the disc body is provided with a grinding sand part for polishing.
6. The grinding structure of claim 1, wherein, The boot assembly comprises a boot body, the boot body has opposite front and rear ends, the rear end is provided with the mounting joint, the polishing assembly penetrates from the front end to the rear end and is drivingly connected with the power assembly, the front end is provided with the boot foot, and the polishing assembly is rotatably arranged in the guide through hole.
7. The grinding structure of claim 6, wherein The grinding structure further comprises a first bearing, the first bearing is arranged between the polishing assembly and the guide through hole, the outer ring of the first bearing is connected with the guide through hole, and the inner ring of the first bearing rotates synchronously with the polishing assembly.
8. The grinding structure of claim 6, wherein, The rear end is provided with a mounting groove, the mounting groove is formed on the side of the boot body facing the milling handle; the boot assembly further comprises a supporting sleeve, the supporting sleeve is sleeved on the outer periphery of the polishing assembly, one end of the supporting sleeve is detachably arranged in the mounting groove, and the other end of the supporting sleeve is detachably connected with the milling handle.
9. The grinding structure of claim 8, wherein, The boot assembly further comprises a second bearing, the second bearing is arranged in the mounting groove, the second bearing is sleeved on the outer periphery of the polishing assembly and abuts against the supporting sleeve; And / or, the boot assembly further comprises a limiting sleeve, a limiting step is formed at the bottom of the mounting groove, and the limiting sleeve is sleeved on the outer periphery of the polishing assembly and abuts against the limiting step.
10. A milling machine comprising a milling handle, an inside of the milling handle being provided with a power assembly, the milling handle being provided with a mounting interface, characterized in that, The milling machine further comprises the grinding structure according to any one of claims 1 to 9, and the grinding structure is detachably mounted on the mounting interface.