A cutting device

Abstract

The application discloses a cutting device, and relates to the technical field of cutting machines, which comprises a base, a motor assembly and a cutter disc assembly, wherein the base is provided with a rolling part; the motor assembly comprises a motor, and the motor can move up and down relative to the base; the cutter disc assembly comprises a cutter disc and a cutter disc support for mounting the cutter disc, the cutter disc support is connected to an output shaft of the motor, and the motor is used for driving the cutter disc support to rotate so as to drive the cutter disc to rotate, so as to realize the function of mowing grass; when the cutter disc does not collide with a ground obstacle, the motor moves to a first position relative to the base, the cutter disc support is engaged with the rolling part, the rolling part supports the cutter disc support, and the cutter disc is at a fixed height for subsequent mowing; when the cutter disc collides with a ground obstacle, the cutter disc is lifted after being subjected to the force of the ground obstacle, the cutter disc support moves upward, the motor moves to a second position relative to the base, the cutter disc support is separated from the rolling part, the cutter disc and the cutter disc support avoid the obstacle, and the cutter disc colliding with the obstacle can be avoided to cause damage to the motor.

Description

Technical Field

[0001] This invention relates to the field of cutting machinery technology, and in particular to a cutting device. Background Technology

[0002] Cutting devices are commonly found in various cutting machines, such as lawnmowers, in modern industry and daily life. The blade and motor are key components of a lawnmower. Typically, the blade is rigidly connected to the motor's output shaft, and the motor drives the blade to rotate, thus achieving cutting. However, when the blade comes into contact with obstacles on the ground, it can easily damage the motor and shorten its lifespan.

[0003] Therefore, how to prevent the cutter head from colliding with obstacles and causing damage to the motor is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting device that can prevent the cutter head from colliding with obstacles and causing damage to the motor.

[0005] To achieve the above objectives, the present invention provides a cutting device, comprising:

[0006] The base has rolling elements on it;

[0007] Motor assembly, including a motor, which is capable of moving up and down relative to the base;

[0008] The cutter head assembly includes a cutter head and a cutter head bracket for mounting the cutter head. The cutter head bracket is connected to the output shaft of a motor, and the motor is used to drive the cutter head bracket to rotate so as to drive the cutter head to rotate.

[0009] When the motor moves to the first position relative to the base, the cutter head support engages with the rolling element; when the motor moves to the second position relative to the base, the cutter head support separates from the rolling element.

[0010] Preferably, when the cutter head support engages with the rolling element and the motor drives the cutter head support to rotate, rolling friction is generated between the cutter head support and the rolling element.

[0011] Preferably, the motor assembly further includes a motor bracket for mounting the motor, the motor bracket being movably connected to the base, and an elastic element being provided between the motor bracket and the base. The elastic element is used to press the motor bracket toward the rolling element so that the cutter head bracket abuts against the rolling element.

[0012] Preferably, the rolling element includes a rolling body and a bearing housing. The rolling body is disposed on the side of the bearing housing facing the motor bracket. When the motor moves relative to the base to the first position, the cutter head bracket engages with the rolling body.

[0013] Preferably, the base includes several guide posts, and the motor bracket is provided with through holes adapted to the guide posts so that the motor bracket can move along the extension direction of the guide posts.

[0014] Preferably, the bearing housing has a groove for mounting the rolling elements, and the side of the bearing housing facing the motor bracket has an opening communicating with the groove, so that the circumferential side of the rolling elements protrudes from the bearing housing.

[0015] Preferably, the cutter head support includes a conical surface that mates with the rolling element, and the rolling surface of the rolling element and the conical surface are in contact.

[0016] Preferably, the guide post has a radially extending protrusion, the elastic element is sleeved on the outer periphery of the guide post, the elastic element is connected to the protrusion, and one end of the elastic element abuts against the side of the motor bracket facing the protrusion.

[0017] Preferably, the cutter head support is provided with a first sealing wall, and the cutter head is provided with a second sealing wall corresponding to the first sealing wall. The first sealing wall and the second sealing wall are joined together to form a sealed chamber.

[0018] Preferably, the cutter head has a disc-shaped structure, and the second sealing wall has an annular structure, wherein the ratio of the diameter of the second sealing wall to the diameter of the cutter head is greater than or equal to two-thirds.

[0019] Compared with the above-mentioned background technology, the cutting device provided by the present invention has the following technical effects:

[0020] The cutter head bracket is used to fix the cutter head and is connected to the output shaft of the motor, so that the cutter head and the cutter head bracket can move together with the motor and rotate with the output shaft of the motor to achieve the grass cutting function. When the cutter head does not collide with the ground obstacle, the motor moves to the first position relative to the base, the cutter head bracket engages with the rolling element, the rolling element supports the cutter head bracket, and the cutter head is at a fixed height for subsequent grass cutting. When the cutter head collides with the ground obstacle, the cutter head is lifted by the force of the ground obstacle, which drives the cutter head bracket to move upward, and causes the motor to move to the second position relative to the base. The cutter head bracket separates from the rolling element, so that the cutter head and the cutter head bracket avoid the obstacle, and at the same time, it can prevent the cutter head from colliding with the obstacle and causing damage to the motor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cutting device provided in an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the cutting device provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the cutter head bracket assembled on the motor output shaft according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cutter head structure provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the rolling element provided in an embodiment of the present invention.

[0027] in:

[0028] 100-Base, 110-Rolling element, 111-Rolling body, 112-Positioning block, 113-Bearing seat, 120-Guide post;

[0029] 200 - Motor assembly, 210 - Motor, 211 - Output shaft, 220 - Motor bracket;

[0030] 300-Cutter head assembly, 310-Cutter head, 311-Positioning groove, 312-Second sealing wall, 320-Cutter head bracket, 321-Conical surface, 322-Positioning post, 323-First sealing wall;

[0031] 400 - Elastic component. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship 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 position 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 of this invention.

[0035] The purpose of this invention is to provide a cutting device that can prevent the cutter head 310 from colliding with obstacles and causing damage to the motor 210.

[0036] Please see Figure 1 and Figure 2 To achieve the above objectives, the present invention provides a cutting device, including a base 100, a motor assembly 200, and a cutter head assembly 300.

[0037] The cutting device can be a smart lawnmower, a ride-on lawnmower, a push lawnmower, etc., and the base 100 can be the chassis of the lawnmower.

[0038] The base 100 is provided with a rolling element 110, and the rolling element 110 is provided with a positioning block 112 in the circumferential direction to fix the rolling element 110 to a preset position of the base 100. The base 100 has an annular through hole, and the bottom of the rolling element 110 is provided with a vertically extending annular stop edge. The annular stop edge is installed in the annular through hole and fits against the inner wall of the annular through hole. By setting the positioning block 112 and the annular stop edge, the accuracy and stability of the rolling element 110 being installed on the base 100 are improved.

[0039] The motor assembly 200 includes a motor 210, which can be mounted on the chassis of the lawnmower or on the top cover of the lawnmower. The motor 210 is capable of moving up and down relative to the base 100. The blade assembly 300 includes a blade 310 and a blade holder 320 for fixing the blade 310. The blade 310 is equipped with blades. The blade holder 320 is connected to the output shaft 211 of the motor 210. The motor 210 is used to drive the blade holder 320 to rotate, thereby causing the blade 310 to rotate. Rotating the blade 310 causes the blades to cut the grass.

[0040] When the motor 210 moves to the first position relative to the base 100, the cutter head support 320 engages with the rolling element 110; when the motor 210 moves to the second position relative to the base 100, the cutter head support 320 separates from the rolling element 110.

[0041] The motor assembly 200 and the cutter head assembly 300 are arranged vertically, and the cutter head 310 of the cutter head assembly 300 is located below the base 100. The cutter head 310 is fixed relative to the cutter head bracket 320, and the cutter head bracket 320 is connected to the output shaft 211 of the motor 210, so that the distance between the motor 210 and the cutter head assembly 300 in the extension direction of the output shaft 211 is always the same.

[0042] The cutter head bracket 320 is used to fix the cutter head 310, and the cutter head bracket 320 is connected to the output shaft 211 of the motor 210, so that the cutter head 310 and the cutter head bracket 320 can move together with the motor 210 and can rotate with the output shaft 211 of the motor 210 to achieve the grass cutting function. When the cutter head 310 does not collide with ground obstacles, the motor 210 moves relative to the base 100 to the first position, and the cutter head bracket 320 engages with the rolling element 110, which supports the cutter head. The blade holder 320 and the blade 310 are at a fixed height for subsequent mowing. When the blade 310 collides with an obstacle on the ground, the blade 310 is lifted by the force of the obstacle, which drives the blade holder 320 to move upward and causes the motor 210 to move relative to the base 100 to a second position. The blade holder 320 separates from the rolling element 110 so that the blade 310 and the blade holder 320 avoid the obstacle, and at the same time, it can prevent the blade 310 from colliding with the obstacle and causing damage to the motor 210.

[0043] In some embodiments, when the cutter head support 320 engages with the rolling element 110 and the motor 210 drives the cutter head support 320 to rotate, rolling friction is generated between the cutter head support 320 and the rolling element 110, and the cutter head support 320 rotates at a fixed height to achieve the cutter head 310 rotating at a fixed height for subsequent mowing. When the cutter head support 320 engages with the rolling element 110 and the motor 210 does not drive the cutter head support 320 to rotate, only a supporting force is generated between the cutter head support 320 and the rolling element 110, which will not cause wear on the cutter head support 320 and the rolling element 110, and at the same time makes the position of the cutter head support 320 stable.

[0044] In some embodiments, the motor assembly 200 further includes a motor bracket 220 for mounting the motor 210. The motor bracket 220 is movably connected to the base 100. An elastic element 400 is provided between the motor bracket 220 and the base 100. The elastic element 400 is used to press the motor bracket 220 toward the rolling element 110 so that the cutter head bracket 320 abuts against the rolling element 110. The elastic element 400 may be a spring. The spring force causes the motor bracket 220 to move downward, thereby pressing the cutter head bracket 320 against the rolling element 110, which improves the stability of the cutter head 310 during operation. In addition, when the cutter head 310 collides with a ground obstacle and rises under pressure, the motor bracket 220 is driven to move upward by the cutter head bracket 320 and the motor 210. The motor bracket 220 compresses the spring, and the spring force has a buffering effect to prevent the motor bracket 220 and the motor 210 from moving upward too quickly and directly colliding with other components.

[0045] It should be noted that the rolling element 110 can be a thrust bearing. The rolling element 110 includes rolling elements 111 and a bearing housing 113. The rolling elements 111 are disposed on the side of the bearing housing 113 facing the motor bracket 220. When the motor 210 moves to the first position relative to the base 100, the cutter head bracket 320 engages with the rolling elements 111. The rolling elements 111 are evenly distributed along the circumference of the bearing housing 113. By distributing the rolling elements 111 on the side of the bearing housing 113 facing the motor bracket 220, the cutter head bracket 320 contacts the rolling elements 111 of the rolling element 110. When the cutter head bracket 320 rotates, it drives the rolling elements 111 to rotate on the bearing housing 113 and roll relative to each other on the surface of the cutter head bracket 320, reducing the frictional resistance between the cutter head bracket 320 and the rolling elements 110 when rotating, and reducing the wear between the cutter head bracket 320 and the rolling elements 110.

[0046] The bearing housing 113 is provided with a groove for mounting the rolling element 111. The bearing housing 113 has an opening in the groove on the side facing the motor bracket 220 so that the circumferential side of the rolling element 111 protrudes from the bearing housing 113. The axis of the rolling element 111 and the axis of the bearing housing 113 are set at an angle, and the top end face of the rolling element 111 perpendicular to its own axis is located outside the groove.

[0047] It should be noted that by ensuring the length of the rolling element 111 along its own axis is greater than the depth of the groove, the top end face of the installed rolling element 111 is located outside the groove. This increases the contact area between the cutter head support 320 and the rolling element 111 when the motor 210 moves relative to the base 100 to the first position, and also facilitates the installation and removal of the rolling element 111. The bearing seat 113 has an opening communicating with the groove on the side facing the motor support 220, allowing the circumferential portion of the rolling element 111 to protrude from the inner end face of the bearing seat 113. The cutter head support 320 includes components that engage with the rolling element 111. The tapered surface 321 is used to fit the rolling surface of the rolling element 111. By setting the tapered surface 321, even after the cutter head support 320 has been worn for a long time, the elastic force of the elastic element 400 can still keep the tapered surface 321 and the rolling surface of the rolling element 111 in contact, which improves the stability of the cutter head 310. At the same time, it avoids wear caused by the contact between the tapered surface 321 and the inner end face of the bearing seat 113. When the rolling element 111 is a frustum or cylinder, the rolling surface is the circumferential surface of the rolling element 111. When the rolling element 111 is a spherical structure, the rolling surface is the outer spherical surface of the rolling element 111.

[0048] When the motor 210 moves to the first position relative to the base 100, the height of the top of the conical surface 321 is greater than or equal to the height of the top of the rolling element 111, and the height of the bottom of the conical surface 321 is less than or equal to the height of the bottom of the base 100, so as to increase the area of ​​the conical surface 321 and improve the contact effect between the cutter head support 320 and the rolling element 111.

[0049] It should be noted that the cutter head 310 and the cutter head support 320 are coaxially arranged, and the axes of the cutter head 310 and the cutter head support 320, the axis of the output shaft 211 of the motor 210, and the axis of the aforementioned annular through hole are collinear, so that the cutter head 310 and the cutter head support 320 can run smoothly around their own axes under the drive of the output shaft 211 of the motor 210.

[0050] In some embodiments, the base 100 includes a plurality of guide posts 120 arranged in a circumferential array. The motor bracket 220 is provided with through holes adapted to the guide posts 120 so that the motor bracket 220 can move along the extension direction of the guide posts 120. The guide posts 120 are vertically extending column structures, and preferably there are three guide posts 120. The three guide posts 120 are evenly arranged along the circumference of the annular through hole and pass through the through hole of the motor bracket 220 to guide the movement of the motor bracket 220.

[0051] The guide post 120 has a radially extending protrusion, and the elastic element 400 is sleeved on the outer periphery of the guide post 120. The elastic element 400 is connected to the protrusion, and one end of the elastic element 400 abuts against the side of the motor bracket 220 facing the protrusion to press the motor bracket 220 downward, so that the cutter head bracket 320 engages with the rolling element 111.

[0052] The protrusions are evenly distributed along the outer circumference of the guide post, or the protrusions are in a ring shape. One end of the elastic element 400 is fixed by the protrusions, so that the other end of the elastic element 400 abuts against the motor bracket 220 and pushes the motor bracket 220 down until the cutter head bracket 320 is in contact with the rolling element 111 of the rolling element 110. When the cutter head 310 is subjected to external force and drives the cutter head bracket 320 to move up, the motor bracket 220 moves up to further compress the elastic element 400.

[0053] In other embodiments, a sleeve structure arranged in a circular array can be provided on the base 100, or through holes can be opened on the base 100. A column structure adapted to the sleeve structure or through hole can be provided at the bottom of the motor bracket 220. By connecting the elastic element 400 to the motor bracket 220 and the base 100, the column structure is inserted into the corresponding sleeve structure or through hole. In the absence of external force, the elastic element 400 pulls the motor bracket 220 downward, so that the cutter head bracket 320 fits against the rolling element 111 of the rolling element 110. When an external force is applied to the cutter head 310, causing the cutter head 310 and the cutter head support 320 to move upward synchronously, the motor support 220 pulls the elastic element 400 upward, causing the elastic element 400 to be in a stretched state, while buffering the upward movement of the motor support 220. Then, under the action of the stretched elastic element 400, the motor support 220 returns to its original state, causing the motor 210 to move relative to the base 100 to the first position. Throughout the entire process, the column structure is at least partially located in the sleeve structure or through hole to guide the movement of the motor support 220.

[0054] In addition, a height detector is provided on the base 100. The height detector is used to detect the height of the motor bracket 220 relative to the base 100. When the motor bracket 220 rises from the initial height to a height higher than the preset height, or when the motor bracket 220 moves upward from the initial height multiple times in a short period of time (for example, moving upward from the initial height position once per second on average within 5 consecutive seconds), the height detector outputs a first signal. The controller that receives the first signal controls the motor 210 to stop running, and the operator can then restart the motor 210. When the height of the motor bracket 220 during a single upward movement is between the initial height and the preset height and continues for a first time period (for example, when the height is between the initial height and the preset height), the motor bracket 220 moves upward for a period of time (for example, when the height is between the initial height and the preset height). (For 0.5 seconds), the height detector outputs a second signal, the controller acquires the second signal, and calculates the ratio of the difference between the height of the motor bracket 220 and the preset height to the ratio between the initial height and the preset height, so as to control the motor 210 to output a proportional speed at the initial speed, so as to gradually slow down the operation of the motor 210 when the cutter head 310 collides with the ground obstacle. When the detection motor bracket 220 has not passed the preset height and has returned to the initial height, the motor 210 can continue to run at the initial speed. Here, the initial height refers to the height of the motor bracket 220 relative to the base 100 when the motor 210 moves to the first position relative to the base 100.

[0055] Please see Figure 3 and Figure 4In this embodiment, the cutter head support 320 has several positioning posts 322 on the side opposite to the motor support 220. The cutter head 310 has positioning grooves 311 adapted to the positioning posts 322. The positioning posts 322 are columnar protrusions extending toward the cutter head 310, and the positioning grooves 311 are annular structures extending toward the cutter head support 320. The positioning posts 322 are inserted into the corresponding positioning grooves 311 to restrict the relative rotation of the cutter head 310 and the cutter head support 320. Both the positioning posts 322 and the positioning grooves 311 have connecting holes, and the connecting holes are located in the middle of the positioning posts 322 and the positioning grooves 311. Connecting parts are inserted into the corresponding connecting holes to fix the cutter head 310 and the cutter head support 320 relatively. The connecting parts can be bolts, etc., so that the cutter head 310 and the cutter head support 320 are relatively detachable, which facilitates subsequent maintenance and replacement.

[0056] The number of positioning pins 322 and positioning grooves 311 are in one-to-one correspondence, and preferably there are three of each. The three positioning pins 322 are evenly arranged along the circumference of the cutter head support 320, and the three positioning grooves 311 are evenly arranged along the circumference of the cutter head 310.

[0057] In addition, the cutter head support 320 is provided with a first sealing wall 323, and the cutter head 310 is provided with a second sealing wall 312 corresponding to the first sealing wall 323. The first sealing wall 323 and the second sealing wall 312 are joined together to form a sealed chamber. The positioning post 322 and the positioning groove 311 are both located inside the sealed chamber, which avoids grass clippings and other debris from clogging between the cutter head 310 and the cutter head support 320 when the positioning post 322 and the positioning groove 311 are exposed.

[0058] It should be noted that the first sealing wall 323 and the second sealing wall 312 should have a certain width in the vertical direction, and the horizontal cross-sectional dimensions of the first sealing wall 323 and the second sealing wall 312 should be smaller than the horizontal cross-sectional dimensions of the annular through hole, so that the first sealing wall 323 and the second sealing wall 312 have a certain upward movement space.

[0059] In some embodiments, the cutter head 310 has a disc-shaped structure, and the second sealing wall 312 has an annular structure. The ratio of the diameter of the second sealing wall 312 to the diameter of the cutter head 310 is greater than or equal to two-thirds, which can improve the stability of the cutter head 310 and prevent the cutter head 310 from shaking relative to the cutter head support 320. The width of the first sealing wall 323 and the second sealing wall 312 in the vertical direction after docking is set to be large enough to provide the space required for the cutter head 310 to move upward. The width of the first sealing wall 323 and the second sealing wall 312 in the vertical direction after docking should be consistent with the movable distance of the cutter head support 320 on the guide post 120. At the same time, a buffer block can be set at the bottom of the base 100 to avoid direct contact between the cutter head 310 and the base 100 when the cutter head 310 moves upward too much, thereby improving the service life of the cutter head 310 of the base 100.

[0060] One of the first sealing wall 323 and the second sealing wall 312 has a sealing boss at one end, and the other has a sealing groove at the other end. The sealing boss includes a horizontal end face, an inner vertical end face, and an outer vertical end face. The sealing groove includes a horizontal bottom face and a vertical side face. The horizontal end face is attached to the horizontal bottom face, and the outer vertical end face is attached to the vertical side face, so as to achieve the sealing of the first sealing wall 323 and the second sealing wall 312. At the same time, a sealing ring can be added to one of the sealing boss and the sealing groove to improve the sealing effect and prevent grass clippings from entering the sealing chamber.

[0061] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0063] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A cutting device, characterized in that, include: A base (100) on which a rolling element (110) is provided; The motor assembly (200) includes a motor (210) that is capable of moving up and down relative to the base (100); The cutter head assembly (300) includes a cutter head (310) and a cutter head bracket (320) for mounting the cutter head (310). The cutter head bracket (320) is connected to the output shaft (211) of the motor (210). The motor (210) is used to drive the cutter head bracket (320) to rotate so as to drive the cutter head (310) to rotate. When the motor (210) moves to the first position relative to the base (100), the cutter head support (320) engages with the rolling element (110), and when the motor (210) moves to the second position relative to the base (100), the cutter head support (320) separates from the rolling element (110).

2. The cutting device according to claim 1, characterized in that, When the cutter head support (320) engages with the rolling element (110) and the motor (210) drives the cutter head support (320) to rotate, rolling friction is generated between the cutter head support (320) and the rolling element (110).

3. The cutting device according to claim 1, characterized in that, The motor assembly (200) further includes a motor bracket (220) for mounting the motor (210), the motor bracket (220) being movably connected to the base (100), and an elastic element (400) being provided between the motor bracket (220) and the base (100). The elastic element (400) is used to press the motor bracket (220) toward the rolling element (110) so that the cutter head bracket (320) abuts against the rolling element (110).

4. The cutting device according to claim 3, characterized in that, The rolling element (110) includes a rolling body (111) and a bearing housing (113). The rolling body (111) is disposed on the side of the bearing housing (113) facing the motor bracket (220). When the motor (210) moves to a first position relative to the base (100), the cutter head bracket (320) engages with the rolling body (111).

5. The cutting device according to claim 3, characterized in that, The base (100) includes a plurality of guide posts (120), and the motor bracket (220) is provided with through holes adapted to the guide posts (120) so that the motor bracket (220) can move along the extension direction of the guide posts (120).

6. The cutting device according to claim 4, characterized in that, The bearing housing (113) is provided with a groove for mounting the rolling element (111), and the bearing housing (113) has an opening communicating with the groove on the side facing the motor bracket (220) so that the circumferential side of the rolling element (111) protrudes from the bearing housing (113).

7. The cutting device according to claim 4, characterized in that, The cutter head support (320) includes a conical surface (321) that mates with the rolling element (111), and the rolling surface of the rolling element (111) and the conical surface (321) are in contact.

8. The cutting device according to claim 5, characterized in that, The guide post (120) has a radially extending protrusion. The elastic element (400) is sleeved on the outer periphery of the guide post (120). The elastic element (400) is connected to the protrusion, and one end of the elastic element (400) abuts against the side of the motor bracket (220) facing the protrusion.

9. The cutting apparatus according to any one of claims 1-8, characterized in that, The cutter head support (320) is provided with a first sealing wall (323), and the cutter head (310) is provided with a second sealing wall (312) corresponding to the first sealing wall (323). The first sealing wall (323) and the second sealing wall (312) are joined together to form a sealed chamber.

10. The cutting device according to claim 9, characterized in that, The cutter head (310) has a disc-shaped structure, and the second sealing wall (312) has an annular structure. The ratio of the diameter of the second sealing wall (312) to the diameter of the cutter head (310) is greater than or equal to two-thirds.

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