Cutting device

Abstract

The invention discloses a cutting device, and relates to the technical field of cutting machinery, the cutting device comprises a base, a motor assembly and a cutterhead assembly, and a rolling piece is arranged on the base; the motor assembly comprises a motor which can move up and down relative to the base. The cutterhead assembly comprises a cutterhead and a cutterhead support used for installing the cutterhead, the cutterhead support is connected to an output shaft of the motor, the motor is used for driving the cutterhead support to rotate to drive the cutterhead to rotate so as to achieve the mowing function, and when the cutterhead does not collide with a ground obstacle, the motor moves to a first position relative to the base, and the cutterhead support is connected with the rolling piece; when the cutterhead collides with a ground obstacle, the cutterhead is lifted under the acting force of the ground obstacle, and the cutterhead support moves upwards, so that the motor moves to a second position relative to the base, the cutterhead support is separated from the rolling piece, the cutterhead and the cutterhead support avoid the obstacle, and the mowing efficiency is improved. Meanwhile, the cutter head can be prevented from colliding with obstacles to damage the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting machinery, and in particular to a cutting device. Background Art

[0002] In modern industry and daily life, cutting devices are commonly found in various cutting machines, such as lawn mowers. The blade disc and motor are key components of a lawn mower. Usually, the blade disc of a lawn mower is rigidly connected to the output shaft of the motor, and the motor drives the blade disc to rotate to achieve cutting. However, when the blade disc contacts obstacles on the ground, it is easy to damage the motor and affect the motor life.

[0003] Therefore, how to prevent the cutter head from colliding with obstacles and causing damage to the motor is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a cutting device which can prevent the blade disc from colliding with obstacles and causing damage to the motor.

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

[0006] A base, wherein a rolling element is arranged on the base;

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

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

[0009] When the motor moves to a first position relative to the base, the cutter head bracket engages with the rolling element, and when the motor moves to a second position relative to the base, the cutter head bracket is separated from the rolling element.

[0010] Preferably, when the cutter disc bracket is engaged with the rolling element and the motor drives the cutter disc bracket to rotate, rolling friction is generated between the cutter disc bracket and the rolling element.

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

[0012] Preferably, the rolling element comprises a rolling body and a bearing seat, the rolling body is arranged on a side of the bearing seat facing the motor bracket, and when the motor moves to the first position relative to the base, the cutter disc bracket engages with the rolling body.

[0013] Preferably, the base includes a plurality of guide columns, and the motor bracket is provided with through holes adapted to the guide columns, so that the motor bracket can move along the extending direction of the guide columns.

[0014] Preferably, the bearing seat is provided with a groove body for mounting the rolling body, and the side of the bearing seat facing the motor bracket is provided with an opening connected to the groove body, so that the circumferential side of the rolling body protrudes from the bearing seat.

[0015] Preferably, the cutter disc support comprises a tapered surface matched with the rolling body, and the rolling surface of the rolling body and the tapered surface fit together.

[0016] Preferably, the guide column is provided with a radially extending protrusion, the elastic member is sleeved on the outer circumference of the guide column, the elastic member is connected to the protrusion, and one end of the elastic member abuts against a side of the motor bracket facing the protrusion.

[0017] Preferably, the cutter disc support is provided with a first sealing wall, the cutter disc is provided with a second sealing wall corresponding to the first sealing wall, and the first sealing wall and the second sealing wall are butted against each other to form a sealed chamber.

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

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

[0020] The blade disc bracket is used to fix the blade disc, and the blade disc bracket is connected to the output shaft of the motor, so that the blade disc and the blade disc bracket can move together with the motor and can rotate with the output shaft of the motor to achieve the mowing function. When the blade disc does not collide with a ground obstacle, the motor moves to a first position relative to the base, and the blade disc bracket engages with a rolling element, which supports the blade disc bracket, and the blade disc is at a fixed height for subsequent mowing. When the blade disc collides with a ground obstacle, the blade disc is lifted by the force of the ground obstacle, driving the blade disc bracket to move upward, and causing the motor to move to a second position relative to the base, and the blade disc bracket is separated from the rolling element, so that the blade disc and the blade disc bracket avoid obstacles, and at the same time, it can prevent the blade disc from colliding with obstacles and causing damage to the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a cutting device provided by an embodiment of the present invention;

[0023] Figure 2 A structural cross-sectional view of a cutting device provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the structure in which the cutter head bracket provided in an embodiment of the present invention is assembled on the output shaft of a motor;

[0025] Figure 4 A schematic diagram of the structure of a cutter disc provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the structure of a 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 column;

[0029] 200-motor assembly, 210-motor, 211-output shaft, 220-motor bracket;

[0030] 300-cutter disc assembly, 310-cutter disc, 311-positioning groove, 312-second sealing wall, 320-cutter disc bracket, 321-conical surface, 322-positioning column, 323-first sealing wall;

[0031] 400-Elastic parts. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0035] The object of the present invention is to provide a cutting device that can prevent the blade disc 310 from colliding with obstacles and causing damage to the motor 210.

[0036] See also 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 disc assembly 300.

[0037] The cutting device may be an intelligent lawn mower, a riding lawn mower, a push lawn mower, etc., and the base 100 may be a chassis of the lawn mower.

[0038] The base 100 is provided with a rolling member 110, and a positioning block 112 is provided on the circumference of the rolling member 110 for fixing the rolling member 110 to a preset position of the base 100, wherein the base 100 is provided with an annular through hole, and the bottom of the rolling member 110 is provided with a vertically extending annular rib, which is installed in the annular through hole and fits with the inner wall of the annular through hole. By setting the positioning block 112 and the annular rib, the accuracy and stability of the installation of the rolling member 110 to the base 100 are improved.

[0039] The motor assembly 200 includes a motor 210, which can be installed on the chassis of the lawn mower, or the motor 210 is installed on the upper cover of the lawn mower. The motor 210 can move up and down relative to the base 100. The cutter disc assembly 300 includes a cutter disc 310 and a cutter disc bracket 320 for fixing the cutter disc 310. The cutter disc 310 is provided with a blade. The cutter disc bracket 320 is connected to the output shaft 211 of the motor 210. The motor 210 is used to drive the cutter disc bracket 320 to rotate to drive the cutter disc 310 to rotate. The rotating cutter disc 310 allows the blade to cut the grass.

[0040] When the motor 210 moves to a first position relative to the base 100 , the cutter tray bracket 320 engages with the rolling element 110 , and when the motor 210 moves to a second position relative to the base 100 , the cutter tray bracket 320 separates from the rolling element 110 .

[0041] Among them, the motor assembly 200 and the cutter disc assembly 300 are arranged up and down, and the cutter disc 310 of the cutter disc assembly 300 is located below the base 100, the cutter disc 310 is fixed relative to the cutter disc bracket 320, and the cutter disc bracket 320 is connected to the output shaft 211 of the motor 210, so that the distance between the motor 210 and the cutter disc assembly 300 in the extension direction of the output shaft 211 is always consistent.

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

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

[0044] In some embodiments, the motor assembly 200 also includes a motor bracket 220 for mounting the motor 210, the motor bracket 220 is movably connected to the base 100, and an elastic member 400 is provided between the motor bracket 220 and the base 100, the elastic member 400 is used to press the motor bracket 220 in the direction toward the rolling member 110 so that the cutter disc bracket 320 abuts against the rolling member 110, wherein the elastic member 400 can be a spring, and the elastic force of the spring is used to move the motor bracket 220 downward, thereby causing the cutter disc bracket 320 to press the rolling member 110, thereby improving the stability of the cutter disc 310 during operation. In addition, when the cutter disc 310 collides with a ground obstacle and is forced to rise, when the motor bracket 220 is driven to move upward by the cutter disc bracket 320 and the motor 210, the motor bracket 220 compresses the spring, and the elastic force of the spring has a buffering effect to prevent the motor bracket 220 and the motor 210 from moving up too quickly and directly colliding with other components.

[0045] It should be noted that the rolling element 110 may adopt a thrust bearing. The rolling element 110 includes a rolling body 111 and a bearing seat 113. The rolling body 111 is arranged on the side of the bearing seat 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 body 111. The rolling bodies 111 are evenly arranged along the circumference of the bearing seat 113. The rolling bodies 111 are arranged on the side of the bearing seat 113 facing the motor bracket 220, so that the cutter head bracket 320 contacts the rolling body 111 of the rolling element 110. When the cutter head bracket 320 rotates, the rolling body 111 is driven to rotate on the bearing seat 113 and roll relatively on the surface of the cutter head bracket 320, thereby reducing the friction resistance between the cutter head bracket 320 and the rolling element 110 when the cutter head bracket 320 rotates, and reducing the wear between the cutter head bracket 320 and the rolling element 110.

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

[0047] It should be noted that the length of the rolling body 111 along its own axis is greater than the depth of the groove body, so that the top end surface of the rolling body 111 after installation is located on the outside of the groove body. In this way, when the motor 210 moves to the first position relative to the base 100, the contact area between the cutter head bracket 320 and the rolling body 111 can be increased, and the installation and removal of the rolling body 111 are convenient. An opening connected to the groove body is provided on the side of the bearing seat 113 facing the motor bracket 220, so that the circumferential side of the rolling body 111 protrudes from the inner end surface of the bearing seat 113. The cutter head bracket 320 includes a portion that cooperates with the rolling body 111. The tapered surface 321, the rolling surface of the rolling body 111 and the tapered surface 321 are fitted together. Through the setting of the tapered surface 321, even if the cutter disc bracket 320 is worn out after long-term use, the elastic force of the elastic member 400 can still make the tapered surface 321 and the rolling surface of the rolling body 111 fit together, thereby improving the stability of the cutter disc 310 and avoiding the wear caused by the contact between the tapered surface 321 and the inner end surface of the bearing seat 113. When the rolling body 111 is a truncated cone or a cylinder, the rolling surface is the circumferential surface of the rolling body 111. When the rolling body 111 is a spherical structure, the rolling surface is the outer spherical surface of the rolling body 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 body 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 disc bracket 320 and the rolling body 111.

[0049] It should be noted that the cutter disc 310 and the cutter disc bracket 320 are coaxially arranged, and the axes of the cutter disc 310 and the cutter disc bracket 320, the axis of the output shaft 211 of the motor 210, and the axis of the above-mentioned annular through hole are collinear, so that the cutter disc 310 and the cutter disc bracket 320 can run smoothly around their own axes driven by the output shaft 211 of the motor 210.

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

[0051] Among them, the guide column 120 is provided with a radially extending protrusion, the elastic member 400 is sleeved on the outer periphery of the guide column 120, the elastic member 400 is connected to the protrusion, and one end of the elastic member 400 abuts against the side of the motor bracket 220 facing the protrusion to press the motor bracket 220 downward so that the cutter disc bracket 320 engages with the rolling body 111.

[0052] The protrusions are evenly arranged along the outer circumference of the guide column, or the protrusions are in an annular structure. One end of the elastic member 400 is fixed by the protrusions, so that the other end of the elastic member 400 abuts against the motor bracket 220 and pushes the motor bracket 220 to move downward until the cutter disc bracket 320 is attached to the rolling body 111 of the rolling member 110. When the cutter disc 310 is driven by an external force to move up, the motor bracket 220 moves up to further compress the elastic member 400.

[0053] In other embodiments, a sleeve structure in a circumferential array may be provided on the base 100 or a through hole may be opened on the base 100, and a column structure adapted to the sleeve structure or the through hole may be provided at the bottom of the motor bracket 220. By connecting the elastic member 400 to the motor bracket 220 and the base 100, the column structure is inserted into the corresponding sleeve structure or the through hole. In the absence of external force, the elastic member 400 pulls the motor bracket 220 downward, so that the cutter disc bracket 320 fits on the rolling body 111 of the rolling member 110. When an external force acts on the cutter disc 310, causing the cutter disc 310 and the cutter disc bracket 320 to move upward synchronously, the motor bracket 220 pulls the elastic member 400 upward, causing the elastic member 400 to be in a stretched state, while buffering the upward movement of the motor bracket 220. Thereafter, under the action of the stretched elastic member 400, the motor bracket 220 recovers, causing the motor 210 to move to the first position relative to the base 100. During the entire process described above, the column structure is at least partially located in the sleeve structure or the through hole to guide the movement of the motor bracket 220.

[0054] In addition, a height detector is also provided on the base 100, and 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 the motor bracket 220 moves up from the initial height multiple times in a short period of time (for example, within 5 consecutive seconds, it moves up from the initial height position once per second on average), the height detector outputs a first signal, and the controller for obtaining the first signal controls the motor 210 to stop running, and subsequent staff can restart the motor 210 to run; when the height of the motor bracket 220 moved up once is between the initial height and the preset height and lasts for a first period of time (for example, , lasts for 0.5 seconds), the height detector outputs a second signal, the controller obtains the second signal, and calculates the ratio of the difference between the height of the motor bracket 220 and the preset height to the initial height and the preset height, so as to control the motor 210 to re-output a proportional rotation speed at the initial rotation speed, so as to achieve that when the cutter disc 310 collides with a ground obstacle, the operation of the motor 210 is gradually slowed down, and when it is detected that the 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 rotation speed, wherein 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] See also Figure 3 and Figure 4The cam 310 is provided with a plurality of positioning posts 322 on the side of the cutter head 320 facing away from the motor support 220, and the cutter head 310 is provided with a positioning groove 311 adapted to the positioning posts 322. The positioning posts 322 are columnar protrusions extending toward the cutter head 310, and the positioning groove 311 is an annular structure extending toward the cutter head support 320. The positioning posts 322 are inserted into the corresponding positioning grooves 311 to limit the relative rotation of the cutter head 310 and the cutter head support 320. The positioning posts 322 and the positioning grooves 311 are both provided with connecting holes, and the connecting holes are located in the middle of the positioning posts 322 and the positioning grooves 311. Connectors are passed through the corresponding connecting holes to relatively fix the cutter head 310 and the cutter head support 320. The connecting members can be bolts, etc., so that the cutter head 310 and the cutter head support 320 are relatively detachable, which is convenient for subsequent maintenance and replacement.

[0056] The number of positioning posts 322 and positioning grooves 311 corresponds one to one, and preferably there are three of them. The three positioning posts 322 are evenly arranged along the circumference of the cutter disc support 320 , and the three positioning grooves 311 are evenly arranged along the circumference of the cutter disc 310 .

[0057] In addition, the blade disc bracket 320 is provided with a first sealing wall 323, and the blade disc 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 connected to form a sealed chamber; the positioning column 322 and the positioning groove 311 are both located inside the sealed chamber, which prevents grass clippings and other debris from being blocked between the blade disc 310 and the blade disc bracket 320 when the positioning column 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 disc 310 is in a disc-shaped structure, and the second sealing wall 312 is in an annular structure. The ratio of the diameter of the second sealing wall 312 to the diameter of the cutter disc 310 is greater than or equal to two-thirds, which can improve the stability of the cutter disc 310 and prevent the cutter disc 310 from shaking relative to the cutter disc support 320. After the first sealing wall 323 and the second sealing wall 312 are connected, the overall width in the vertical direction is set to be large enough to provide the space required for the cutter disc 310 to move upward, and the overall width in the vertical direction after the first sealing wall 323 and the second sealing wall 312 are connected should be consistent with the movable distance of the cutter disc support 320 on the guide column 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 disc 310 and the base 100 when it moves up too much, thereby improving the service life of the cutter disc 310 on the base 100.

[0060] A sealing boss is provided at the end of one of the first sealing wall 323 and the second sealing wall 312, and a sealing groove is provided at the end of the other one, 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, and the sealing of the first sealing wall 323 and the second sealing wall 312 is achieved by the horizontal end face being attached to the horizontal bottom face and the outer vertical end face being attached to the vertical side face. 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 merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

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

[0063] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

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

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

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

4. The cutting device according to claim 3, characterized in that: The rolling element (110) comprises a rolling body (111) and a bearing seat (113); the rolling body (111) is arranged on a side of the bearing seat (113) facing the motor support (220); when the motor (210) moves to a first position relative to the base (100), the cutter head support (320) engages with the rolling body (111).

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

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

7. The cutting device according to claim 4, characterized in that: The cutter disc support (320) comprises a tapered surface (321) matched with the rolling body (111), and the rolling surface of the rolling body (111) and the tapered surface (321) are in close contact with each other.

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

9. The cutting device according to any one of claims 1 to 8, characterized in that: The cutter disc support (320) is provided with a first sealing wall (323), and the cutter disc (310) is provided with a second sealing wall (312) corresponding to the first sealing wall (323), and the first sealing wall (323) and the second sealing wall (312) are butted against each other to form a sealed chamber.

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

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