Cutting head, cutting mechanism and self-moving device

Abstract

A cutting disc, a cutting mechanism and a self-moving device, the cutting disc comprises a disc body and a metal piece, the disc body is made of plastic material, a plurality of first connecting holes are arranged on the disc body, the plurality of first connecting holes are used for being connected with a power component of the self-moving device, so that the power component drives the disc body to rotate; the metal piece is embedded in the inside of the disc body, a plurality of second connecting holes are arranged on the metal piece, the plurality of second connecting holes correspond to the plurality of first connecting holes one by one, the inner diameter of the second connecting hole is not greater than the inner diameter of the first connecting hole, and the metal piece is used for abutting against the metal piece by a fastener arranged in the first connecting hole and the second connecting hole.

Description

Technical Field

[0001] This application relates to the field of lawn mowing equipment, and more particularly to a cutting disc, a cutting mechanism, and a self-moving device. Background Technology

[0002] The cutting discs on existing cutting robots are mainly made of plastic. When the cutting disc rotates at high speed, the connection holes that connect to the power components will wear and enlarge due to long-term vibration and wear, which may cause the cutting disc to come off, posing a safety hazard. Utility Model Content

[0003] This application provides a cutting disc, a cutting mechanism, and a self-moving device, which aims to solve at least one of the technical problems existing in the prior art.

[0004] According to a first aspect of this application, a cutting disc is provided, the cutting disc comprising:

[0005] The cutter head body is made of plastic material and has a plurality of first connection holes. The plurality of first connection holes are used to connect to the power component of the self-moving device, so that the power component drives the cutter head body to rotate.

[0006] A metal component is embedded inside the cutter head body. The metal component has multiple second connecting holes, which correspond one-to-one with multiple first connecting holes. The inner diameter of the second connecting hole is not greater than the inner diameter of the first connecting hole. The metal component is used for fasteners that pass through the first connecting hole and the second connecting hole to abut against the metal component.

[0007] In a cutting disc according to one embodiment of this application, the metal part is further provided with a torque transmission part, which cooperates with the disc body to transmit the power of the power component to the disc body.

[0008] In the cutting disc of this application, the disc body has a first end face facing the power component and a second end face for mounting the cutting blade, the first connecting hole penetrates the first end face and the second end face, and at least a portion of the metal part is exposed from the second end face.

[0009] In a cutting disc according to one embodiment of this application, the first connecting hole includes a countersunk section and a through section. The countersunk section and the through section are connected sequentially from the second end face to the first end face along the axial direction of the first connecting hole. The inner diameter of the through section is smaller than the inner diameter of the countersunk section. The second connecting hole is disposed between the countersunk section and the through section.

[0010] In a cutting disc according to one embodiment of this application, the inner diameter of the second connecting hole is adapted to the inner diameter of the through hole section.

[0011] In a cutting disc according to one embodiment of this application, the torque transmission part includes one of a protruding structure and a groove structure that cooperate with each other. The protruding structure is disposed in one of the metal part and the disc body, and the groove structure is disposed in the other of the metal part and the disc body.

[0012] In a cutting disc according to one embodiment of this application, the groove structure includes a plurality of strip grooves extending in the radial direction of the metal part, the plurality of strip grooves being distributed in a circumferential array with the central axis of the metal part as the center, and the second connecting hole being disposed between two adjacent strip grooves.

[0013] In a cutting disc according to one embodiment of this application, the strip groove extends through the first end face and the second end face.

[0014] In a cutting disc according to one embodiment of this application, the torque transmission part includes at least one spline groove or boss formed on the periphery of the metal part and extending axially, and the disc body has a mating part that mates with the spline groove or boss.

[0015] In a cutting disc according to one embodiment of this application, the main body of the cutting disc is further provided with a third connecting hole, and a mounting component for installing the cutting blade is provided in the third connecting hole.

[0016] In a cutting disc according to one embodiment of this application, an embedding groove is formed in the middle of the mounting member, and an annular protrusion is formed in the middle of the third connecting hole, the annular protrusion being embedded in the embedding groove.

[0017] In a cutting disc according to one embodiment of this application, a limiting portion is formed on the periphery of the mounting member, and the limiting portion is embedded in the inner sidewall of the third connecting hole to restrict the rotation of the mounting member relative to the third connecting hole.

[0018] According to a second aspect of this application, this application provides a cutting mechanism, the cutting mechanism including a cutting blade and the aforementioned cutting disc, the cutting blade being fixed on the cutting disc.

[0019] According to a third aspect of this application, this application provides a self-moving device, including a power unit and the aforementioned cutting mechanism, wherein the cutting mechanism is fixed to the power unit.

[0020] The technical solution provided in this application embodiment can include the following beneficial effects: This application designs a cutting disc, a cutting mechanism, and a self-moving device. The cutting disc includes a metal part and a disc body made of plastic material. The metal part is embedded inside the disc body. The disc body is provided with a plurality of first connecting holes, and the metal part is provided with a plurality of second connecting holes. The plurality of second connecting holes correspond one-to-one with the plurality of first connecting holes. The inner diameter of the second connecting hole is not greater than the inner diameter of the first connecting hole, so that the fasteners inserted in the first connecting holes and the second connecting holes abut against the metal part. This can fundamentally avoid the problem of the first connecting holes on the disc body expanding due to vibration and wear, ensure the long-term stability of the fastener and the cutting disc body connection, and greatly reduce the risk of the cutting disc flying off due to connection failure. This eliminates the main safety hazard, protects the disc body, extends the service life of the entire cutting disc, and solves the reliability problem of cutting discs made of lightweight and easily worn materials such as plastic when connected to power components.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a cutting disc provided in one embodiment of this application;

[0024] Figure 2 yes Figure 1 A schematic diagram of the cutting disc from another angle;

[0025] Figure 3 yes Figure 1 A cross-sectional view of the cutting disc in the diagram;

[0026] Figure 4 yes Figure 1 An exploded view of the cutting disc in the diagram;

[0027] Figure 5 yes Figure 4 A schematic diagram of the main body of the cutter head in the diagram;

[0028] Figure 6 yes Figure 5 A schematic diagram of the main body of the cutter head from another angle;

[0029] Figure 7 yes Figure 5 A cross-sectional schematic diagram of the cutter head body;

[0030] Figure 8 yes Figure 4 A schematic diagram of the structure of the metal parts in the diagram;

[0031] Figure 9 yes Figure 4 A structural diagram of the mounting components.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Cutting blade disc;

[0034] 10. Cutter head body; 10a. First end face; 10b. Second end face; 11. First connecting hole; 111. Through hole section; 112. Countersunk hole section; 12. Third connecting hole; 121. Annular protrusion;

[0035] 20. Metal part; 21. Second connecting hole; 22. Torque transmission part; 221. Strip groove; 222. Spline groove;

[0036] 30. Mounting component; 31. Internal threaded hole; 32. Embedded groove; 33. Limiting part. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] It should also be understood that the terminology used in this application specification is merely for describing specific realities within the scope of this application. It is important to understand that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used solely for the convenience of describing this application and for 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 limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] like Figures 1 to 3 As shown, according to a first aspect of this application, this application provides a cutting disc 100, which includes a disc body 10 and a metal part 20. The disc body 10 is made of plastic material, and the metal part 20 is embedded inside the disc body 10. This utilizes the advantages of both plastic and metal materials to solve the problem that the disc body 10 made of plastic material is easily damaged, such as at the connection point where the cutting disc 100 is connected to the power component of an automatic moving device.

[0041] For example, the cutter head body 10 is provided with a plurality of first connection holes 11, which are used to connect with the power component of the self-moving device, so that the power component drives the cutter head body 10 to rotate. The metal part 20 is provided with a plurality of second connection holes 21, which correspond one-to-one with the plurality of first connection holes 11. The inner diameter of the second connection hole 21 is not greater than the inner diameter of the first connection hole 11, so that the fasteners passing through the first connection holes 11 and the second connection holes 21 can abut against the metal part 20 to bear the preload from the fasteners and the rotational shearing force generated when the power component drives the cutter head body 10 to rotate. This transfers the force point of the cutter head body 10 to the metal part 20, avoiding plastic deformation of the first connection holes 11 made of plastic material due to the preload, which would lead to a decrease in the preload of the fasteners and loosening. It also avoids the rotational shearing force from continuously wearing down the first connection holes 11, causing the first connection holes 11 to enlarge, and ultimately causing the connection between the cutting cutter head 100 and the power component to fail, or even causing the cutting cutter head 100 to fall off. Fasteners include, but are not limited to, screws.

[0042] By adopting the above technical solution, since the metal part 20 is embedded inside the cutter head body 10, and the inner diameter of the second connecting hole 21 is not greater than the inner diameter of the first connecting hole 11, the metal part 20 can withstand the preload from the fasteners and the rotational shearing force generated when the power component drives the cutting cutter head 100 to rotate. This fundamentally solves the problem that the first connecting hole 11, which is easily damaged when the cutting cutter head 100 made of plastic material is connected to the power component, and greatly improves the service life and safety of the cutting cutter head 100. The first connecting hole 11 has a larger diameter and mainly serves as a channel and positioning function to ensure that the fasteners can pass smoothly through the cutting cutter head 100 for locking. The second connecting hole 21 has a diameter less than or equal to that of the first connecting hole 11 and is mainly used to withstand the preload during fastener locking, so that the fasteners can maintain a stable preload for a long time. The metal insert bears all the enormous pressure during fastener locking and the shearing force during the rotation of the cutting cutter head 100, greatly reducing the wear of the cutter head body 10 and completely avoiding the problem of hole enlargement in the cutter head body 10.

[0043] In one alternative implementation, such as Figures 4 to 8As shown, the metal part 20 is also provided with a torque transmission part 22, which cooperates with the cutter head body 10 to transmit the power of the power component to the cutter head body 10, ensuring that the power of the power component can be transmitted from the metal part 20 to the cutter head body 10 efficiently and reliably, preventing relative rotation between the two. If the torque transmission part 22 is not provided between the cutter head body 10 and the metal part 20, even if the cutter head body 10 is fastened to the power component by the metal part 20, under the large torque drive of the power component and repeated start-stop and changing torque, the metal part 20 may experience slight relative rotation or slippage with the cutter head body 10. Over time, this may cause the first connecting hole 11 to wear out, making it unable to transmit torque, or even causing excessive local stress in the cutter head body 10, leading to cracking. Therefore, this application uses the torque transmission part 22 to transmit the torque applied by the power component to the metal part 20 to the cutter head body 10, improving the reliability of the cutting cutter head 100.

[0044] In an optional embodiment, the cutter head body 10 has a first end face 10a facing the power component and a second end face 10b for mounting the cutting blade. A first connecting hole 11 passes through the first end face 10a and the second end face 10b. At least a portion of the metal part 20 is exposed from the second end face 10b so that when the fastener passes through the first end face 10a from the second end face 10b and is locked with the power component, the head or nut of the fastener will abut against the exposed metal part 20 on the second end face 10b. This not only eliminates the possibility of the cutter head body 10 being deformed and worn under pressure, but also ensures the long-term stability of the preload.

[0045] In an optional embodiment, the first connecting hole 11 includes a countersunk section 112 and a through section 111. The countersunk section 112 and the through section 111 are connected sequentially from the second end face 10b to the first end face 10a along the axial direction of the first connecting hole 11. The inner diameter of the through section 111 is smaller than the inner diameter of the countersunk section 112. The second connecting hole 21 is disposed between the countersunk section 112 and the through section 111, providing a natural receiving cavity and positioning step for the connection of the fastener. When the fastener is installed into the first connecting hole 11 and the second connecting hole 21, the fastener can be easily inserted into the countersunk section 112. Even if there is a slight deviation, it will not scratch or bump the hole wall of the countersunk section 112, thereby smoothly aligning with the second connecting hole 21, simplifying the assembly process and making it suitable for automated assembly. The fastener can be a countersunk screw similar to a hexagonal cylindrical head screw. The size of the countersunk section 112 can accommodate the head of the screw and will not protrude from the second end face 10b. This avoids the protruding fastener from accidentally colliding or scratching with obstacles during operation, thus protecting the fastener itself. At the same time, when the fastener is tightened, the head of the fastener will form a surface contact with the end face of the metal part 20 and press it down. That is, the huge preload generated by the fastener is directly applied to the metal part 20, rather than to the side wall of the countersunk section 112. The countersunk section 112 only serves as a clearance and is completely unaffected by force, fundamentally preventing the countersunk section 112 from being crushed or creeping at that location.

[0046] In an optional embodiment, the inner diameter of the second connecting hole 21 is adapted to the inner diameter of the through hole section 111. This not only ensures the coaxiality of the second connecting hole 21 with the first connecting hole 11 during the injection molding process of the cutting disc 100, that is, the center of the second connecting hole 21 and the center of the through hole section 111 are absolutely coincident; but also ensures the perpendicularity of the end face of the metal part 20 to the axis of the connecting hole, so that the fastener can pass through the through hole section 111 and connect to the power component without obstruction during assembly. This avoids the problem of the fastener connection being weak or even unable to be assembled due to misalignment or tilting of the through hole section 111 and the second connecting hole 21.

[0047] In an optional embodiment, the torque transmission unit 22 includes one of a protruding structure and a groove structure that cooperate with each other. The protruding structure is disposed in one of the metal part 20 and the cutter head body 10, and the groove structure is disposed in the other of the metal part 20 and the cutter head body 10, so that the protruding structure and the groove structure can cooperate with each other to form an interlocking convex-concave structure between the metal part 20 and the cutter head body 10, thereby being used to transmit torque.

[0048] For example, a protruding structure is formed on the metal part 20, and a groove structure is formed on the cutter head body 10. When the cutter head body 10 is injection molded, the molten plastic flows into the gaps between the protruding structures, and after cooling, a groove structure that encloses the protruding structure is formed. Alternatively, the groove structure is formed on the metal part 20, and the protruding structure is formed on the cutter head body 10. When the cutter head body 10 is injection molded, the plastic flows into the groove structure to form a matching protruding structure. By adopting the above technical solution, the torque transmission between the metal part 20 and the cutter head body 10 does not depend on the adhesive force or coefficient of friction of the glue, but on the shear strength of the interlocking structure between the metal part 20 and the cutter head body 10, which is extremely reliable and solves the problem of slippage between the metal part 20 and the cutter head body 10.

[0049] In an optional embodiment, the groove structure includes a plurality of strip grooves 221 extending in the radial direction of the metal part 20. The plurality of strip grooves 221 are arranged in a circumferential array with the central axis of the metal part 20 as the center. The second connecting hole 21 is disposed between two adjacent strip grooves 221 to ensure the balance of torque transmission from the metal part 20 to the cutter head body 10, and to prevent excessive local stress or eccentric vibration of the cutter head due to uneven force.

[0050] In an alternative embodiment, the strip groove 221 extends through the first end face 10a and the second end face 10b, so that the protruding structure can completely penetrate the metal part 20 to form one or more complete plastic ribs. These plastic ribs can bear the shearing force and completely transmit the torque from the metal part 20 to the cutter head body 10.

[0051] In an optional embodiment, the torque transmission part 22 includes at least one spline groove 222 or boss formed on the periphery of the metal part 20 and extending axially. The cutter head body 10 has a mating part that mates with the spline groove 222 or boss, so that when the metal part 20 transmits torque to the cutter head body 10, the metal part 20 can distribute the shear force generated by the transmitted torque to the spline groove 222 or boss, avoiding stress concentration. The mating part refers to a structure formed during the forming of the cutter head body 10 that is completely complementary to and engages with the spline groove 222 or boss.

[0052] In one alternative implementation, such as Figure 3 , Figure 4 , Figure 5 and Figure 9As shown, the cutter head body 10 is also provided with a third connecting hole 12. A mounting component 30 for installing the cutting blade is provided within the third connecting hole 12, allowing the cutting blade to be locked onto the cutter head body 10 via the mounting component 30. This fundamentally solves the problems of low strength and easy damage from repeated disassembly and assembly of the cutter head body 10. The mounting component 30 is a metal sleeve with external teeth. An internal threaded hole 31 is formed within the metal sleeve for threaded connection with a screw, so that during installation, the screw can pass through the cutting hole of the cutting blade and be directly screwed into the internal threaded hole 31 of the metal sleeve.

[0053] In an optional embodiment, an embedding groove 32 is formed in the middle of the mounting member 30, and an annular protrusion 121 is formed in the middle of the third connecting hole 12. The annular protrusion 121 is embedded in the embedding groove 32 to ensure that the mounting member 30 will not be pulled out or loosened from the cutter head body 10 when subjected to the huge centrifugal force, impact force and vibration during the operation of the cutting blade. That is, during the injection molding process of the cutting blade 100, the molten plastic is injected into the mold under high pressure, and the plastic flows into the embedding groove 32 in the middle of the mounting member 30. After cooling and solidification, the annular protrusion 121 formed by the plastic is firmly mechanically locked in the embedding groove 32 of the metal part 20, thereby forming a lock that restricts the embedding groove 32.

[0054] In an optional embodiment, a limiting portion 33 is formed on the periphery of the mounting member 30. The limiting portion 33 is embedded in the inner wall of the third connecting hole 12 to restrict the rotation of the mounting member 30 relative to the third connecting hole 12, thereby fundamentally eliminating the possibility of rotation of the mounting member 30 relative to the cutter head body 10 and ensuring that the mounting member 30 and the cutter head body 10 always remain synchronized. The limiting portion 33 can be an external tooth pattern provided on the periphery of the mounting member 30.

[0055] like Figures 1 to 9 As shown, according to a second aspect of this application, this application provides a cutting mechanism, which includes a cutting blade and the aforementioned cutting disc 100, with the cutting blade fixed on the cutting disc 100.

[0056] like Figures 1 to 9 As shown, according to a third aspect of this application, this application provides a self-moving device, including a power component and the aforementioned cutting mechanism, wherein the cutting mechanism is fixed to the power component.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A cutting disc, characterized in that, The cutting disc includes: The cutter head body is made of plastic material and has a plurality of first connection holes. The plurality of first connection holes are used to connect to the power component of the self-moving device, so that the power component drives the cutter head body to rotate. A metal component is embedded inside the cutter head body. The metal component has multiple second connecting holes, which correspond one-to-one with multiple first connecting holes. The inner diameter of the second connecting hole is not greater than the inner diameter of the first connecting hole. The metal component is used for fasteners that pass through the first connecting hole and the second connecting hole to abut against the metal component.

2. The cutting disc according to claim 1, characterized in that, The metal part is also provided with a torque transmission part, which cooperates with the cutter head body to transmit the power of the power component to the cutter head body.

3. The cutting disc according to claim 2, characterized in that, The cutter head body has a first end face facing the power component and a second end face for mounting the cutting blade. The first connecting hole passes through the first end face and the second end face, and at least a portion of the metal part is exposed from the second end face.

4. The cutting disc according to claim 3, characterized in that, The first connecting hole includes a countersunk section and a through section. The countersunk section and the through section are connected sequentially from the second end face to the first end face along the axial direction of the first connecting hole. The inner diameter of the through section is smaller than the inner diameter of the countersunk section. The second connecting hole is disposed between the countersunk section and the through section.

5. The cutting disc according to claim 4, characterized in that, The inner diameter of the second connecting hole is adapted to the inner diameter of the through hole section.

6. The cutting disc according to claim 3, characterized in that, The torque transmission part includes one of a protruding structure and a groove structure that cooperate with each other. The protruding structure is disposed in one of the metal part and the cutter head body, and the groove structure is disposed in the other of the metal part and the cutter head body.

7. The cutting disc according to claim 6, characterized in that, The groove structure includes a plurality of strip grooves extending in the radial direction of the metal part. The plurality of strip grooves are arranged in a circumferential array with the central axis of the metal part as the center. The second connecting hole is disposed between two adjacent strip grooves.

8. The cutting disc according to claim 7, characterized in that, The strip groove extends through the first end face and the second end face.

9. The cutting disc according to claim 2, characterized in that, The torque transmission part includes at least one spline groove or boss formed on the periphery of the metal part and extending axially, and the cutter head body has a mating part that mates with the spline groove or boss.

10. The cutting disc according to claim 1, characterized in that, The cutter head body is also provided with a third connecting hole, and a mounting component for installing the cutting blade is provided in the third connecting hole.

11. The cutting disc according to claim 10, characterized in that, An embedding groove is formed in the middle of the mounting component, and an annular protrusion is formed in the middle of the third connecting hole, the annular protrusion being embedded in the embedding groove.

12. The cutting disc according to claim 10, characterized in that, The mounting component has a limiting portion formed on its periphery, which is embedded in the inner wall of the third connecting hole to restrict the mounting component from rotating relative to the third connecting hole.

13. A cutting mechanism, characterized in that, The cutting mechanism includes a cutting blade and a cutting disc as described in any one of claims 1 to 12, wherein the cutting blade is fixed on the cutting disc.

14. A self-moving device, characterized in that, It includes a power unit and a cutting mechanism as described in claim 13, wherein the cutting mechanism is fixed to the power unit.

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