Cutting tool

Abstract

The invention discloses a cutting tool, and relates to the technical field of metal cutting tools, the cutting tool comprises a blade, a tool body, a sliding block and a locking screw, and the blade is provided with a center hole. At least one mounting groove is formed in the position, close to the end face, of the cutter body, and a through hole is formed in the mounting groove. The blade is placed in the installation groove and protrudes out of the end face of the cutter body. The sliding block is arranged in the through hole and slides in the axis direction of the center hole, and a threaded hole is formed in the sliding block. The locking screw is inserted into the through hole through the center hole and is connected with the threaded hole in a matched mode so as to fasten the blade. According to the cutting tool provided by the invention, the threaded part of the locking screw is firstly accommodated through the through hole, so that the threaded part can be in butt joint with the threaded hole in the sliding block, the whole threaded part is positioned in the through hole, and the blade is pressed in the mounting groove by using the head part, so that the condition that the blade is easy to slide together with the locking screw due to no positioning constraint is avoided; the operation steps and time consumption of single-time installation are greatly reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of metal cutting tool technology, specifically a cutting tool. Background Technology

[0002] In the field of metal cutting, indexable carbide cutting tools are widely used, and the clamping method of using screws to lock the inserts is quite common, such as... Figure 1 As shown, the general procedure is to first correctly place the existing blade in the groove of the existing blade body, and then screw the existing screw through the center hole of the existing blade into the threaded hole of the groove until the existing blade is locked in the groove.

[0003] In existing operating methods, when operators align the existing screws with the threaded holes by hand, the alignment is essentially a blind operation, making the screws susceptible to external interference (such as slight hand movements or lateral forces during alignment) and prone to misalignment. If this occurs, the operator must pause the alignment process, readjust the existing insert to the preset installation position, and recalibrate the alignment of the screw and threaded hole. This repetitive adjustment process not only increases the number of steps required for each insert installation but also significantly prolongs the actual installation time, reducing single-process assembly efficiency. Furthermore, for tools requiring multiple inserts, each insert installation requires independent alignment of the existing screw and threaded hole, calibration of the insert position, and tightening of the screw. There are no parallel assembly paths, resulting in a linear accumulation of installation time, which undoubtedly increases overall preparation time and reduces processing efficiency.

[0004] Furthermore, existing inserts cannot achieve a stable positioning state before the existing screws are initially tightened, remaining in a free-moving, non-fixed state. This causes the tip height of each existing insert to easily exceed tolerances after assembly. For milling cutters with requirements for radial runout and end face runout, continuous adjustments via a tool setter are necessary, which not only affects the machining accuracy of the tool but also leads to reduced assembly efficiency and decreased production capacity. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a cutting tool to solve the problem that the installation of inserts on existing cutting tools takes a long time and affects the overall machining efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a cutting tool, comprising: A blade with a central hole; The blade body has at least one mounting groove near its end face, and the mounting groove has a through hole; the blade is placed in the mounting groove and protrudes from the end face of the blade body; A slider is disposed in a through hole and slides along the axial direction of the central hole; the slider has a threaded hole. The locking screw is inserted into the through hole through the center hole and engages with the threaded hole to secure the blade.

[0008] As a further embodiment of the present invention, along the direction away from the mounting groove, the through hole includes at least a first hole segment and a second hole segment, and the diameter of the second hole segment is larger than the diameter of the first hole segment. The first hole section is clearance-fitted with the locking screw, and the slider is slidably positioned within the second hole section.

[0009] As a further embodiment of the present invention, the peripheral wall of the slider has at least one limiting protrusion, and the side wall of the second hole section is provided with a limiting groove that matches the limiting protrusion. The limiting groove extends along the sliding direction of the slider, and the limiting protrusion is slidably connected to the limiting groove.

[0010] As a further embodiment of the present invention, it also includes: A spring, located within the second hole section, elastically presses the slider against the side away from the mounting groove.

[0011] As a further embodiment of the present invention, the slider has an annular flange at one end facing the mounting groove, the spring is sleeved on the annular flange, one end of which abuts against the slider, and the other end abuts against the end wall of the second hole section. When the locking screw is in the tightened state, the annular flange abuts against the end wall of the second hole section.

[0012] As a further embodiment of the present invention, a positioning ring groove is provided on the end wall of the second hole section, and the adjacent end of the spring is located in the positioning ring groove.

[0013] As a further embodiment of the present invention, along the direction away from the mounting groove, the through hole also includes a third hole section, in which a detachably connected plug is provided.

[0014] As a further embodiment of the present invention, the mounting groove includes a groove bottom surface and a groove side surface that are in contact with each other, the bottom surface of the blade facing away from the cutting edge abuts against the groove bottom surface, and the peripheral wall of the blade abuts against the groove side surface.

[0015] As a further embodiment of the present invention, the cross-section of the side of the groove gradually increases in the direction away from the bottom of the groove.

[0016] As a further embodiment of the present invention, multiple mounting slots are provided at intervals along the periphery of the blade body, and the opening of each mounting slot is arranged along the tangential direction of the peripheral wall of the blade body.

[0017] According to the present invention, a cutting tool is provided, which has at least the following technical effects: the cutting tool includes a cutting blade, a cutting body, a slider, and a locking screw; the cutting blade has a central hole; the cutting body has at least one mounting groove near its end face; the mounting groove has a through hole; the cutting blade is placed in the mounting groove and protrudes from the end face of the cutting body; the slider is disposed in the through hole and slides along the axial direction of the central hole; the slider has a threaded hole; the locking screw is inserted into the through hole through the central hole and engages with the threaded hole to secure the cutting blade.

[0018] Therefore, the cutting tool provided by this invention first accommodates the threaded portion of the locking screw through a through hole, ensuring that the threaded portion can align with the threaded hole on the slider. Since the entire threaded portion is within the through hole, the head presses the cutting tool into the mounting groove, preventing the cutting tool from easily slipping off with the locking screw due to the lack of positioning constraint. This eliminates the need for repeated adjustments to the cutting tool position and calibration of the locking screw's posture, significantly reducing the number of operation steps and time required for each installation, and improving single-process assembly efficiency. Furthermore, during the locking process, the locking screw position is fixed, and the slider replaces the axial movement of the locking screw, ensuring that the cutting tool's positioning surface remains tightly fitted with the mounting groove. For milling cutters with requirements for radial and axial runout, this effectively controls the tip height deviation, eliminating the need for tool setting adjustments and balancing assembly efficiency with tool machining accuracy. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a partial structural diagram of an existing cutting tool; Figure 2 A partial exploded view of a cutting tool provided in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 Another structural schematic diagram of the central locking component; Figure 5 This is a schematic diagram of the front view structure of a cutting tool provided in an embodiment of the present invention; Figure 6 for Figure 5 A magnified view of a section at point B in the middle; Figure 7 for Figure 6 A schematic diagram of the structure in another state.

[0021] Figure label: 10. Existing blade body; 20. Existing blade; 30. Existing screw; 100. Blade; 110. Center hole; 200. Tool body; 210. Mounting groove; 211. Groove bottom surface; 212. Groove side surface; 220. Through hole; 221. First hole section; 222. Second hole section; 2221. Limiting groove; 2222. Positioning ring groove; 223. Third hole section; 300, slider; 310, threaded hole; 320, limiting protrusion; 330, annular flange; 400. Locking screws; 500, Spring; 600, plug. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0024] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] Refer to the existing tool structure Figure 1 As shown, the existing blade body 10 has no structure in the connecting hole to guide the existing screw 30. During the installation of the existing blade 20, the operator needs to hold it down with their hand at all times. In this unrestrained state of activity, the operator performs the alignment operation between the existing screw 30 and the connecting hole. Since the alignment operation is a blind operation, the existing screw 30 is easily affected by external forces (such as slight shaking of the operator's hand, lateral force during screw alignment, etc.) and may slip off. The installation is difficult and requires a high level of experience.

[0029] In view of this, please refer to Figures 2 to 7 As shown, an embodiment of the present invention provides a cutting tool, comprising: The blade 100 has a central hole 110.

[0030] The blade body 200 has at least one mounting groove 210 near its end face, and the mounting groove 210 has a through hole 220. The blade 100 is placed in the mounting groove 210 and protrudes from the end face of the blade body 200.

[0031] The slider 300 is disposed in the through hole 220 and slides along the axial direction of the central hole 110. The slider 300 has a threaded hole 310.

[0032] The locking screw 400 is inserted into the through hole 220 through the center hole 110 and is engaged with the threaded hole 310 to fasten the blade 100.

[0033] In this embodiment, the blade 100 has a generally conical blade structure with a conical peripheral wall, a bottom surface and a top surface that intersect the two ends of the peripheral wall, respectively. The junction where the top surface intersects the peripheral wall forms a continuous cutting edge. A central hole 110 is provided on the axis of the blade 100 for easy fastening and installation.

[0034] In this embodiment, the tool body 200 can be a rotating rod-shaped or block-shaped structure. The end face of the tool body 200 faces the workpiece, and the side of the tool body 200 facing away from the end face is used to connect to the chuck of the machine tool. Multiple mounting grooves 210 are provided on the tool body 200 near the end face; that is, multiple mounting grooves 210 are provided at the junction of the peripheral wall of the tool body 200 and the adjacent end face. The mounting grooves 210 at least match a portion of the inserts 100. When the inserts 100 are placed in the mounting grooves 210, at least the cutting edge protrudes from the end face of the tool body 200 to enable cutting.

[0035] Each mounting slot 210 has a through hole 220 on its bottom surface, which communicates with the center hole 110 on the corresponding blade 100. The through hole 220 is used to house the slider 300 and to accommodate the threaded portion of the locking screw 400.

[0036] In this embodiment, the slider 300 is generally cylindrical or rod-shaped. It is placed inside the through hole 220 and can reciprocate along the axis of the central hole 110. However, the slider 300 can only move within a preset stroke inside the through hole 220 and cannot move into the mounting groove 210. A circumferential limiting structure, such as a limiting groove and a limiting protrusion, can be provided between the slider 300 and the through hole 220, or both the slider 300 and the through hole 220 can have square cross-sections. A threaded hole 310 is provided at the center of the slider 300, facing the central hole 110.

[0037] In this embodiment, the locking screw 400 is used to lock the blade 100. It includes a head and a threaded part. The head is slightly larger than the diameter of the central hole 110, and the threaded part is slightly smaller than the diameter of the central hole 110 and matches the threaded hole 310. The threaded part of the locking screw 400 passes through the central hole 110 and is inserted into the through hole 220, and is engaged with the threaded hole 310 on the slider 300. The blade 100 is fastened by screwing.

[0038] It should be noted that when the slider 300 is in its extreme position away from the mounting groove 210, the threaded part of the locking screw 400 should also be able to mate with the threaded hole 310 to avoid the situation where the locking screw 400 cannot be locked.

[0039] In addition, the head end face of the locking screw 400 can be provided with a screwing groove or screwing protrusion, such as a Torx shape, to facilitate the operator to use screwing tools for docking and screwing operations.

[0040] In this way, compared to the existing fastening structure where the screw 30 passes through the existing blade 20 and is screwed into the connecting hole on the existing tool body 10, the application of the cutting tool provided in this embodiment of the invention is as follows: Figure 6 , Figure 7As shown, the threaded portion of the locking screw 400 is first accommodated through the through hole 220, ensuring that the threaded portion can mate with the threaded hole on the slider 300. Since the entire threaded portion is within the through hole 220, the head presses the insert 100 into the mounting groove 210, preventing the insert 100 from easily slipping off with the locking screw 400 due to the lack of positioning constraints. This eliminates the need to repeatedly adjust the position of the insert 100 and calibrate the posture of the locking screw 400, significantly reducing the number of operation steps and time spent in a single installation and improving the assembly efficiency of a single process. Moreover, during the locking process, the position of the locking screw 400 is fixed, and the slider 300 replaces the axial movement of the locking screw 400, ensuring that the positioning surface of the insert 100 is always in close contact with the mounting groove 210. For milling cutters with requirements for radial runout and end face runout, this effectively controls the height deviation of the tool tip, eliminating the need for tool setting adjustment and balancing assembly efficiency and tool machining accuracy.

[0041] It is worth noting that the alignment and locking operations during the assembly of the multi-blade 100 are more continuous, which alleviates the problem of linear accumulation of single installation time in the traditional multi-blade 100 assembly, shortens the overall assembly cycle, and breaks through the limitation of assembly efficiency of the multi-blade 100 tool structure.

[0042] In some embodiments, along the direction away from the mounting groove 210, the through hole 220 includes at least a first hole segment 221 and a second hole segment 222, and the diameter of the second hole segment 222 is larger than the diameter of the first hole segment 221.

[0043] The first hole section 221 is clearance-fitted with the locking screw 400, and the slider 300 is slidably disposed within the second hole section 222.

[0044] That is, such as Figure 3 As shown, the first hole section 221 communicates with the mounting groove 210, and a step (i.e., the end wall of the second hole section 222) is formed between the first hole section 221 and the second hole section 222, which is used to axially limit the slider 300. That is, when the locking screw 400 is in the locked state, the slider 300 abuts against the step. This facilitates the control of the sliding stroke of the slider 300 and also facilitates processing and installation. It should be noted that a structure or component, such as a plug or retaining ring, should be provided on the side of the second hole section 222 opposite to the first hole section 221 to limit the slider 300, to prevent the slider 300 from moving out freely.

[0045] Furthermore, the first hole section 221 accurately guides the threaded portion of the locking screw 400, further ensuring the installation accuracy of the blade 100. Additionally, a chamfer can be provided at the junction of the first hole section 221 and the mounting groove 210 to further facilitate the insertion of the locking screw 400. Furthermore, in this embodiment, the peripheral wall of the slider 300 has at least one limiting protrusion 320, and the side wall of the second hole segment 222 is provided with a limiting groove 2221 that matches the limiting protrusion 320.

[0046] The limiting groove 2221 extends along the sliding direction of the slider 300, and the limiting protrusion 320 is slidably connected to the limiting groove 2221.

[0047] Specifically, such as Figure 4 As shown, two limiting protrusions 320 are provided at intervals on the peripheral wall of the slider 300. The limiting protrusions 320 extend along the axial direction of the slider 300. Correspondingly, two limiting grooves 2221 are opened on the side wall of the second hole section 222. The limiting grooves 2221 slide with the corresponding limiting protrusions 320. By sliding the limiting protrusions 320 and the limiting grooves 2221, the circumferential rotation of the slider 300 is restricted, preventing it from rotating with the locking screw 400. The structure is more compact and easier to implement.

[0048] Furthermore, in this embodiment, the cutting tool provided by the present invention further includes: A spring 500 is provided in the second hole section 222 to elastically press the slider 300 toward the side away from the mounting groove 210.

[0049] Specifically, such as Figure 6 , Figure 7 As shown, the spring 500 is a cylindrical compression spring, which is located in the second hole section 222. One end of the spring 500 abuts against the slider 300, and the other end abuts against the end wall of the second hole section 222, thereby elastically pressing the slider 300 away from the mounting groove 210.

[0050] In this way, during the tightening of the locking screw 400, the elastic force of the spring 500 always keeps the blade 100 pressed against the mounting groove 210. Furthermore, as the spring 500 shortens, the positioning surface of the blade 100 fits more tightly against the mounting groove 210, which is more conducive to controlling radial runout and end face runout. The specific type and elastic force of the spring 500 can be determined according to actual needs; this embodiment does not impose excessive restrictions.

[0051] Furthermore, in this embodiment, the slider 300 has an annular flange 330 at one end facing the mounting groove 210, and the spring 500 is sleeved on the annular flange 330, with one end abutting against the slider 300 and the other end abutting against the end wall of the second hole section 222.

[0052] When the locking screw 400 is in the tightened state, the annular flange 330 abuts against the end wall of the second hole section 222.

[0053] Specifically, such as Figure 6 , Figure 7As shown, the outer diameter of the annular flange 330 is slightly smaller than the inner diameter of the spring 500. During the tightening process, the annular flange 330 positions the spring 500, preventing it from moving freely and ensuring a more balanced elastic force. When the locking screw 400 is in the tightened state, the annular flange 330 abuts against the end wall of the second hole section 222.

[0054] Furthermore, in this embodiment, a positioning ring groove 2222 is provided on the end wall of the second hole segment 222, and the adjacent end of the spring 500 is located in the positioning ring groove 2222.

[0055] In this way, the spring 500 is further positioned during the tightening process, preventing the spring 500 from moving freely and affecting the positioning of the locking screw 400, and also leaving the space required to install the spring 500.

[0056] Furthermore, in this embodiment, along the direction away from the mounting groove 210, the through hole 220 also includes a third hole section 223, in which a detachably connected plug 600 is provided.

[0057] For example, such as Figure 3 , Figure 6 , Figure 7 As shown, the third hole section 223 is located at the end opposite to the mounting groove 210. The third hole section 223 has internal threads, and the peripheral wall of the plug 600 has external threads that match the internal threads. The plug 600 is screwed into the third hole section 223 to limit the slider 300, preventing it from falling out freely, and also controlling the movement stroke of the slider 300. It should be noted that the diameter of the third hole section 223 is not smaller than the diameter of the second hole section 222, thus facilitating the installation of the slider 300.

[0058] Furthermore, a conical surface can be provided at the opening on the side of the third hole section 223 opposite to the second hole section 222. A thrust cone matching the conical surface can be provided on the plug 600. Axial limiting is achieved by the cooperation of the thrust cone and the conical surface, completing self-locking and reducing the difficulty of installation. In addition, an internal hexagon countersunk hole or an external hexagon head can be provided on the end face of the thrust cone to facilitate the operator to use screwing tools for docking and screwing operations.

[0059] Of course, the plug 600 can also be replaced by other types of stop components, such as a retaining ring, depending on the actual needs. This embodiment does not impose too many restrictions.

[0060] In some embodiments, the mounting groove 210 includes a groove bottom surface 211 and a groove side surface 212 that are in contact with each other. The bottom surface of the blade 100 facing away from the cutting edge abuts against the groove bottom surface 211, and the peripheral wall of the blade 100 abuts against the groove side surface 212.

[0061] Specifically, such as Figure 3 , Figure 6 As shown, the bottom surface of the blade 100 is supported by the bottom surface 211 of the groove, and the peripheral wall of the blade 100 is positioned by the side surface 212 of the groove, which facilitates the quick assembly and disassembly of the blade 100 and ensures positioning accuracy and good consistency.

[0062] Furthermore, in this embodiment, the cross-section of the side surface 212 of the groove gradually increases in the direction away from the bottom surface 211 of the groove.

[0063] That is, such as Figure 3 As shown, the cross-section of the groove side surface 212 is determined according to the shape of the blade 100, and it fits tightly with the side positioning surface of the blade 100. The groove side surface 212 may include a positioning surface and a clearance surface, and the clearance surface is located between the positioning surface and the groove bottom surface 211 to avoid interference with the positioning of the blade 100, which can be determined according to actual needs.

[0064] In some embodiments, a plurality of mounting grooves 210 are provided at intervals along the periphery of the blade body 200, and the opening of each mounting groove 210 is arranged along the tangential direction of the periphery of the blade body 200.

[0065] Specifically, such as Figure 2 As shown, multiple mounting slots 210 are evenly distributed along the periphery of the cutter body 200, and the openings of each mounting slot 210 face the same direction and are arranged along the tangent of the periphery of the cutter body 200.

[0066] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A cutting tool, characterized in that, include: The blade (100) has a central hole (110). The blade body (200) has at least one mounting groove (210) near its end face, and the mounting groove (210) has a through hole (220); the blade (100) is placed in the mounting groove (210) and protrudes from the end face of the blade body (200); A slider (300) is disposed in the through hole (220) and slides along the axial direction of the central hole (110). The slider (300) has a threaded hole (310). A locking screw (400) is inserted into the through hole (220) through the center hole (110) and engages with the threaded hole (310) to secure the blade (100).

2. The cutting tool according to claim 1, characterized in that, Along the direction away from the mounting groove (210), the through hole (220) includes at least a first hole segment (221) and a second hole segment (222), and the diameter of the second hole segment (222) is larger than the diameter of the first hole segment (221); The first hole section (221) is clearance-fitted with the locking screw (400), and the slider (300) is slidably disposed in the second hole section (222).

3. The cutting tool according to claim 2, characterized in that, The slider (300) has at least one limiting protrusion (320) on its peripheral wall, and a limiting groove (2221) matching the limiting protrusion (320) is provided on the side wall of the second hole section (222). The limiting groove (2221) extends along the sliding direction of the slider (300), and the limiting protrusion (320) is slidably connected to the limiting groove (2221).

4. The cutting tool according to claim 3, characterized in that, Also includes: A spring (500) is disposed in the second hole section (222) to elastically press the slider (300) toward the side opposite to the mounting groove (210).

5. The cutting tool according to claim 4, characterized in that, The slider (300) has an annular flange (330) at one end facing the mounting groove (210), and the spring (500) is sleeved on the annular flange (330), with one end abutting against the slider (300) and the other end abutting against the end wall of the second hole section (222). When the locking screw (400) is in the tightened state, the annular flange (330) abuts against the end wall of the second hole section (222).

6. The cutting tool according to claim 5, characterized in that, A positioning ring groove (2222) is provided on the end wall of the second hole section (222), and the adjacent end of the spring (500) is located in the positioning ring groove (2222).

7. The cutting tool according to claim 2, characterized in that, Along the direction away from the mounting groove (210), the through hole (220) also includes a third hole section (223), in which a detachably connected plug (600) is provided.

8. The cutting tool according to any one of claims 1 to 7, characterized in that, The mounting groove (210) includes a groove bottom surface (211) and a groove side surface (212) that are in contact. The bottom surface of the blade (100) facing away from the cutting edge abuts against the groove bottom surface (211), and the peripheral wall of the blade (100) abuts against the groove side surface (212).

9. The cutting tool according to claim 8, characterized in that, The cross section of the side surface (212) of the groove gradually increases in the direction away from the bottom surface (211) of the groove.

10. The cutting tool according to any one of claims 1 to 7, characterized in that, Multiple mounting slots (210) are provided at intervals along the periphery of the blade body (200), and the opening of each mounting slot (210) is arranged along the tangential direction of the periphery of the blade body (200).

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