CN216492033U - Cutting assembly, rotary cutting device and mower - Google Patents

Abstract

The application relates to the technical field of gardening equipment and provides a cutting assembly, a rotary cutting device and a mower. Wherein the cutting assembly comprises a blade and a guard; the blade is driven by an external driving device to rotate around a shaft, and a cutting area is formed; the blade is provided with a working end surface facing to an object to be cut; the protection piece is arranged on one side of the working end surface of the blade and is provided with a space avoiding area; the minimum distance from the outer contour of the protection part to the rotating shaft of the driving device is larger than or equal to the outer diameter of the cutting area; the projection of the cutting area and the projection of the keep-out area at least partially coincide in a plane perpendicular to the axis of rotation of the drive device. The blade of this application embodiment can be at the within range rotation of guard all the time, and the guard can push away hard thing such as the stone on the route of marcing at cutting assembly cutting process of marcing, prevents that the blade from colliding with the stone when rotating to optional position mutually, has realized the all-round protection to the blade.

Description

Cutting assembly, rotary cutting device and mower

Technical Field

The application relates to the technical field of gardening equipment, and particularly provides a cutting assembly, a rotary cutting device and a mower.

Background

A lawn mower, also known as a lawnmower or a lawn trimmer, is a mechanical tool for trimming lawns, vegetation, and the like. When the mower works, the cutter head of the mower can drive the blades to rotate so as to realize mowing operation.

In an actual application scene, when the blade rotates, the blade can not only contact with grass, but also can inevitably collide with hard objects such as stones of the grassland; in the past, the cutting edge of the blade was damaged. The existing blade protection device can only protect a part of the rotating area of the blade and cannot protect the blade in an all-round way.

SUMMERY OF THE UTILITY MODEL

The purpose of this application embodiment is to provide a cutting subassembly, rotatory cutting device and lawn mower, can make the lawn mower at the during operation, the cutting edge of blade can be protected, avoids the lawn mower to advance in-process blade and hard thing and collides with and lead to impaired problem.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, embodiments of the present application provide a cutting assembly comprising a blade and a guard; the blade is driven by an external driving device to rotate around a shaft, and a cutting area is formed; the blade is provided with a working end surface facing to an object to be cut; the protection piece is arranged on one side of the working end surface of the blade and is provided with a space avoiding area; the minimum distance from the outer contour of the protection part to the rotating shaft of the driving device is larger than or equal to the outer diameter of the cutting area, and the projection of the cutting area and the projection of the evasive area at least partially coincide in a plane perpendicular to the rotating shaft of the driving device.

The beneficial effects of the embodiment of the application are as follows: according to the cutting assembly provided by the embodiment of the application, the blade is driven by the peripheral driving equipment to rotate, so that a cutting area is formed in a rotating mode, and the cutting operation is carried out by utilizing the cutting area; meanwhile, a protection part is arranged on one side of the working end face of the blade, when the cutting assembly is used for cutting, the protection part can protect one side of the working end face of the blade, and an object to be cut can penetrate through the clearance area from the working end face and enter the cutting area, so that the normal operation of cutting is ensured; the blade always rotates in the range of the protection piece, so that the protection piece can push away hard objects such as stones on the path in the advancing and cutting process of the cutting assembly, and the problem of damage caused by collision of the blade and the hard objects is avoided; thereby also enabling the blade to have better cutting efficiency.

In one embodiment, the cutting assembly further comprises a cutter disc driven by the drive device to rotate around an axis, and the blades are arranged on the cutter disc.

By adopting the technical scheme, the blades are arranged on the cutter head, and are driven to rotate by the rotation of the cutter head so as to cut.

In one embodiment, the protection member is an isolation protection plate, the isolation protection plate is provided with at least one opening, and the openings are combined to form an escape area.

By adopting the technical scheme, the bottom of the blade is protected by the isolation guard plate, at least one opening is formed in the isolation guard plate, and the openings are combined together to form the space avoiding area so that an object to be cut can penetrate through the space avoiding area and stretch into the cutting area to be cut.

In one embodiment, the protection part comprises a disc body and a plurality of ribs, the ribs are arranged at intervals along the peripheral side of the disc body, and gaps between every two adjacent ribs jointly form the space avoiding area.

By adopting the technical scheme, the working end face of the blade is protected by the disc body, meanwhile, hard objects on a cutting path are pushed away by the ribs arranged on the peripheral side of the disc body, and the clearance between every two adjacent ribs jointly forms a space avoidance area so that an object to be cut can pass through the space avoidance area and stretch into the cutting area, and when the protection piece protects the blade, the smooth cutting work is ensured.

In one embodiment, the guard further comprises a reinforcing structure for fixed connection to the ribs.

Through adopting foretell technical scheme, through fixed connection additional strengthening on the rib to consolidate the rib.

In one embodiment, the reinforcing structure is a loop, the loop is connected with each rib, and each rib is provided with a convex part protruding out of the loop.

By adopting the technical scheme, the ribs are connected by the ring strips so as to improve the stability of the ribs, and the bulge is used for pushing and arranging hard objects such as stones and the like in the advancing process.

By adopting the technical scheme, the bottom of the blade is protected by the isolation protective net, and the object to be cut can pass through the clearance area formed by the meshes of the isolation protective net more easily, so that the cutting efficiency is effectively improved. In one embodiment, the protection piece is used for being connected with the cutter head, so that the protection piece rotates synchronously with the rotation of the cutter head in the same direction; or the protecting piece is used for being connected with the cutter head so that the protecting piece can rotate reversely in synchronization with the rotation of the cutter head; alternatively, the guard is adapted to be coupled to the cutter head such that the guard remains stationary in synchronization with rotation of the cutter head.

By adopting the technical scheme, the protection piece is connected with the cutter head, and can rotate in the same direction, rotate in the opposite direction or keep still along with the blades under the condition that the cutter head rotates, and the protection piece can protect the blades.

In a second aspect, the embodiment of the present application further provides a rotary cutting device, including connecting piece, driving piece and cutting assembly as above, the driving piece sets up on the connecting piece, and the output of driving piece is connected with cutting assembly, and the driving piece is used for driving the blade to rotate.

The beneficial effects of the embodiment of the application are as follows: the rotary cutting device provided by the embodiment of the application comprises the cutting assembly, and the cutting assembly can push away hard objects such as stones on a path in the cutting work so as to protect the blade, so that the blade is prevented from being damaged by collision, the use efficiency of the rotary cutting device is improved, and the problem that the blade is frequently replaced due to the fact that the blade is easy to damage is solved.

In a third aspect, embodiments of the present application further provide a lawn mower including at least a rotary cutting device as described above.

The beneficial effects of the embodiment of the application are as follows: the lawn mower that this application embodiment provided, owing to including foretell rotatory cutting device, the lawn mower mow efficiency higher.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a lawn mower according to an embodiment of the present disclosure

FIG. 2 is a schematic structural diagram of a rotary cutting apparatus according to an embodiment of the present application;

fig. 3 is a schematic bottom-side structure view of a rotary cutting apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a cutting zone of a blade provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of a protection device according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another protection device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a side guard provided in an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10-cutting assembly 11-cutter head 12-blade

13-guard 14-side guard 20-rotary cutting device

21-connecting piece 22-driving piece 30-mower

121-working end face 122-cutting area 131-clearance area

132-isolation guard plate 133-disc body 134-rib

135-reinforcing structure 136-boss 141-skirt

142-connecting plate 143-bottom plate 1321-opening.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1 to 7 are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

When the mower works, the cutter head of the mower can drive the blades to rotate so as to realize mowing operation. However, in practical application scenarios, when the blade rotates, the blade not only contacts with grass, but also inevitably collides with hard objects such as stones of the grassland; in the past, the cutting edge of the blade was damaged. The existing blade protection device can only protect a part of the rotating area of the blade and cannot protect the blade in an all-round way.

Therefore, the embodiment of the application provides a cutting assembly, a rotary cutting device and a mower, which can protect the blade from all directions by the protection piece, and the protection piece can push away hard objects such as stones to avoid collision damage of the blade in cutting work.

In particular, in a first aspect, embodiments of the present application provide a cutting assembly 10 comprising a blade 12 and a guard 13; the blade 12 is driven by an external driving device to rotate around the shaft, and a cutting area 122 is formed; the blade 12 has a working end face 121 facing the object to be cut; the guard 13 is disposed on one side of the working end surface 121 of the blade 12, and the guard 13 has a clearance area 131; the minimum distance from the outer contour of the guard 13 to the axis of rotation of the drive device is greater than or equal to the outer diameter of the cutting zone 122; the projection of the cutting area 122 coincides at least partially with the projection of the keep-away area 131 in a plane perpendicular to the rotational axis of the drive device.

The blade 12 is used for being connected with a rotating shaft of an external driving device, and the driving device is used for driving the blade 12 to rotate, so that the blade 12 rotates to form a cutting area 122 for performing cutting operation on an object to be cut; as shown in fig. 2, rotation of the blade 12 will result in a cutting zone 122 as shown in phantom. The working end surface 121 mentioned above refers to an end surface of the blade 12 facing the object to be cut in the cutting operation. The space-avoiding region 131 is a penetrating region formed in the guard 13, and the object to be cut can pass through the space-avoiding region 131 from one side of the guard 13 to the other side.

The minimum distance from the outer contour of the guard 13 to the axis of rotation of the drive device is greater than or equal to the outer diameter of the cutting region 122, i.e. the guard 13 completely covers the blade 12 on the side of the working end face 121 of the blade 12, and the blade 12 is completely within the coverage of the guard 13; the blade 12 can always rotate in the range of the protection piece 13 in the process of being driven to rotate, and the protection piece 13 can push away hard objects such as stones on the advancing route in the advancing and cutting process of the cutting assembly 10, so that the blade 12 is prevented from colliding with the stones when rotating to any position, and the blade 12 is protected in all directions. During cutting, the object to be cut (for example, the object to be cut is grass leaves during cutting) can extend from the bottom of the clearance area 131 into the cutting area 122, so that the blade 12 is not hindered from cutting the grass leaves, and the blade 12 has better cutting efficiency.

Wherein, the projection of the cutting area 122 is set to coincide with the projection of the clearance area 131; in a first embodiment, the projection of the cutting zone 122 may comprise the projection of the clearance zone 131, so that during the cutting process, the grass blades extending from the clearance zone 131 can enter the cutting zone 122 and be cut by the blade 12; alternatively, in the second embodiment, the projection of the clearance area 131 includes the projection of the cutting area 122, so that more grass blades can protrude through the clearance area 131 during the cutting process, and the blade 12 can cut away the grass blades at the part of the clearance area 131 coinciding with the projection of the cutting area 122; in the third embodiment, the projection of the cutting area 122 is identical to the projection of the clearance area 131, that is, the projection of the cutting area is completely overlapped with the projection of the clearance area 131, and at this time, the blade 12 can completely cut off the grass blades extending out of the clearance area 131; in the fourth embodiment, the projection of the cutting region 122 partially coincides with the projection of the clearance region 131, and the blade 12 can cut off the grass blades at the partially overlapped part.

In the cutting assembly 10 provided by the embodiment of the present application, the blade 12 is driven by an external driving device to rotate, so as to rotate and form the cutting area 122, and the cutting area 122 is utilized to perform a cutting operation; meanwhile, a protection piece 13 is arranged on one side of the working end surface 121 of the blade 12, when the cutting assembly 10 is used for cutting, the protection piece 13 can protect one side of the working end surface 121 of the blade 12, and an object to be cut can pass through the clearance area 131 from the working end surface 121 and enter the cutting area 122, so that the cutting work can be carried out normally; since the blade 12 always rotates in the range of the protection piece 13, the protection piece 13 can push away hard objects such as stones on the path during the cutting process of the cutting assembly 10, so that the problem of damage caused by collision of the blade 12 and the hard objects is avoided; thereby also providing the blade 12 with better cutting efficiency.

Referring to fig. 2 to 5, in one embodiment, the cutting assembly 10 further includes a cutter disc 11, the cutter disc 11 is driven by a driving device to rotate around an axis, and the blades 12 are disposed on the cutter disc 11. The blades 12 are arranged on the cutter disc 11, and the blades 12 are driven to rotate by the rotation of the cutter disc 11 so as to cut. Specifically, the blade 12 is mounted on the cutter head 11, and the blade 12 is fixedly mounted on the cutter head 11 through the mounting hole by a fastener by forming the mounting hole on the blade 12; alternatively, the cutter blade 12 may be formed on the cutter head 11 and formed integrally with the cutter head 11. Taking the scheme that the blades 12 are mounted on the cutter head 11 through fasteners as an example, the positions of the blades 12 can be selected according to requirements; for example, the blades 12 are arranged at the bottom of the cutter head 11, and the blades 12 are arranged in the range of the cutter head 11; or, the blade 12 is arranged at the bottom of the cutter head 11, and at least part of the blade 12 extends out of the coverage of the cutter head 11; or the blades 12 are arranged at the periphery of the cutter head 11 and arranged along the direction departing from the center of the cutter head 11; or the blade 12 is arranged at the top of the cutter head 11, and at least part of the blade 12 extends out of the coverage of the cutter head 11; the specific installation position of the blade 12 can be selected according to the actual situation, and in the embodiment, the blade 12 is mainly fixedly installed at the bottom of the cutter head 11 through a fastener, and the blade 12 extends out of the coverage area of the cutter head 11 as an example for explanation.

Referring to fig. 2 to 4 and fig. 6, in an embodiment, the shielding member 13 is an isolation shield 132, the isolation shield 132 is provided with at least one opening 1321, and each opening 1321 is combined to form the keep-out area 131. The isolation guard plate 132 is used as the guard 13, and since the isolation guard plate 132 is a one-piece plate-shaped structure, the structural strength is higher, and the isolation guard plate 132 can bear larger impact during the cutting operation, and has a long service life. Meanwhile, the isolation guard 132 is provided with a plurality of openings 1321 to form the keep-out area 131 so that the grass blades at the bottom and the like can extend into the cutting area 122, so that the blade 12 can perform normal cutting operation. The isolation guard plate 132 can be provided with a circle of openings 1321 around the central axis, and the circle of openings 1321 is combined to form the annular clearance area 131, so that the blades 12 can cut grass blades above the circle of clearance area 131 at the same time, and the cutting efficiency is effectively improved.

Referring to fig. 2 to 4 and 6, in an embodiment, the shielding member 13 includes a disk 133 and a plurality of ribs 134, the ribs 134 are spaced along a peripheral side of the disk 133, and gaps between every two adjacent ribs 134 together form the space avoidance region 131. The working end surface 121 of the blade 12 is protected by the disc 133 to prevent the working end surface 121 of the blade 12 from striking the ground and causing damage; ribs 134 are arranged at intervals on the peripheral side of the disc body 133, and the ring bars push hard objects on the path by using the ribs 134, so that the blade 12 is prevented from being damaged due to collision with the hard objects in the advancing process. The gaps between every two adjacent ribs 134 together form the keep-out area 131, so that the object to be cut passes through the keep-out area 131 from the working end surface 121 side and enters the cutting area 122 of the blade 12 for cutting operation.

Referring to fig. 2-4 and 6, in one embodiment, the shielding member 13 further includes a reinforcing structure 135 for fixedly connecting to the ribs 134. By fixedly connecting the reinforcing structure 135 to the ribs 134, the ribs 134 are reinforced, and the ribs 134 are prevented from being broken in the process of pushing and arranging hard objects. Specifically, a reinforcing structure 135 is disposed between each two adjacent ribs 134; alternatively, the reinforcing structure 135 is provided between at least one set of two adjacent ribs 134, for example, the reinforcing structure 135 is provided between any set of two adjacent ribs 134, or the reinforcing structure 135 is provided between any two or more sets of two adjacent ribs 134. In one embodiment, the reinforcing structure 135 may be a reinforcing rod formed between two adjacent ribs 134; in another trial mode, the reinforcing structure 135 may be a reinforcing member formed between two adjacent ribs 134, and the reinforcing member may be a plate-shaped structure, a structure formed by combining a plurality of rod-shaped structures side by side or in a cross manner, or the like.

Referring to fig. 2 to 4 and 6, in one embodiment, the reinforcing structure 135 is a ring, the ring is connected to each rib 134, and the rib 134 has a protrusion 136 protruding outside the ring. The ribs 134 are connected by the ring bars to improve the stability of the ribs 134, and the protrusions 136 are used for pushing and discharging hard objects such as stones in the advancing process. Specifically, the end of the protruding portion 136 may be disposed with a pointed structure, so that the protruding portion 136 is easier and more labor-saving when pushing against a hard object; or, the end of the protruding part 136 can be arranged to be in a blunt structure, so that the protruding part 136 is not easy to damage and the pushing away of hard objects is more efficient.

In one embodiment, the guard 13 is an isolation guard, and the mesh of the isolation guard forms the keep-away zone 131. The isolation protective net is used as the protection piece 13, and because the isolation protective net is composed of a plurality of adjacent meshes, the isolation protective net has small influence on the object to be cut, and the object to be cut, such as grass blades and the like, can more extend into the keep-out area 131 to be cut, so that the cutting efficiency is effectively improved; meanwhile, in the cutting process, the isolation protective net can push away hard objects on the path, so that the blade 12 is protected in an all-around manner on the premise of not influencing the cutting work.

Referring to fig. 2 to 4, in an embodiment, the blades 12 are annularly arranged on the outer circumferential surface of the cutter head 11 with the center of the cutter head 11 as a circle center, that is, the blades 12 are fixedly installed on the cutter head 11; the blades 12 radially extend out of the periphery of the cutter disc 11, so that the cutting area 122 of the blades 12 is formed outside the range of the cutter disc 11, and an object to be cut can more easily extend into the cutting area 122 for cutting during cutting, thereby effectively improving the cutting efficiency.

In the first embodiment of the present embodiment, the guard 13 is adapted to be connected to the cutter head 11 such that the guard 13 rotates in the same direction in synchronization with the rotation of the cutter head 11. Specifically, the guard 13 may be directly connected to the cutter head 11, the center of the guard 13 is connected to the rotation center of the cutter head 11, and the guard 13 is driven to rotate synchronously when the cutter head 11 rotates; or the protection piece 13 is directly connected to an output shaft for driving the cutter head 11 to rotate; alternatively, the protection member 13 is connected with the cutter head 11 through a transmission member, and when the cutter head 11 rotates, the protection member 13 is driven to synchronously rotate or rotate at a reduced speed through the transmission member; the transmission member may be a gear set, an input end of the gear set is connected to the cutter head 11, and an output end of the gear set is connected to the protection member 13. In the second embodiment of the present embodiment, the guard 13 is adapted to be connected to the cutter head 11 such that the guard 13 rotates in reverse in synchronization with the rotation of the cutter head 11. Specifically, the protection piece 13 can be connected with the cutter head 11 through a transmission steering piece, and when the cutter head 11 rotates, the protection piece 13 is driven to rotate reversely through the transmission steering piece; the transmission steering element can be a driving wheel and a driven wheel which are meshed with each other, the driving wheel is connected with the cutter head 11, and the driven wheel is connected with the protection piece 13, so that when the cutter head 11 rotates, the protection piece 13 can simultaneously rotate reversely. In a third embodiment of the present embodiment, the guard 13 is adapted to be connected to the cutter head 11 such that the guard 13 remains stationary in synchronization with the rotation of the cutter head 11. Specifically, the center of the cutter head 11 is adapted to be coupled to an output shaft of a driving device so that the driving device drives the cutter head 11 to rotate, the guard 13 is coupled to the blades by the driving device, and the guard 13 may be coupled to a fixed end of the driving device so that the guard 13 is maintained in a stationary state with respect to the cutter head 11.

Referring to fig. 1 to 7, in one embodiment, the cutting assembly 10 further includes a side guard 14, and the side guard 14 is disposed outside the blades 12 in a radial direction of the cutter disc 11. It will be appreciated that the side guards 14 comprise at least side guards 141 radially disposed outwardly of the blades 12; in an actual production process, the side guard 14 is fixed at a fixed end of the driving device, and therefore, the side guard 14 further includes a connecting plate 142, the connecting plate 142 is bent to form a side guard 141, and an end of the side guard 141 away from the connecting plate 142 is bent to form a bottom plate 143. By providing the side guard 14 outside the blade 12, the safety hazard of the blade 12 injuring a person on the side during cutting operations is avoided.

Referring to fig. 2 to 7, in a second aspect, an embodiment of the present invention further provides a rotary cutting device 20, which includes a connecting member 21, a driving member 22, and the cutting assembly 10 as described above, wherein the driving member 22 is disposed on the connecting member 21, an output end of the driving member 22 is connected to the cutting assembly 10, and the driving member 22 is used for driving the blade 12 to rotate. The rotary cutting device 20 provided by the embodiment of the application comprises the cutting assembly 10, and the cutting assembly 10 can push away hard objects such as stones on a path in the cutting work to protect the blade 12, so that the blade 12 is prevented from being damaged by collision, the use efficiency of the rotary cutting device 20 is improved, and the problem that the blade 12 is frequently replaced due to the fact that the blade 12 is easily damaged is avoided.

Referring to fig. 1 to 7, in a third aspect, an embodiment of the present application further provides a lawn mower 30, where the lawn mower 30 at least includes the rotary cutting device 20 as described above. In practical application, the mower 30 further comprises a mower body, and at least one rotary cutting device 20 is arranged at the bottom of the mower body; alternatively, the lawn mower 30 further comprises a handpiece, and the rotary cutting device 20 is disposed at a distal end of the handpiece for handheld cutting operation. The mower 30 according to the embodiment of the present application includes the rotary cutting device 20, and the mowing efficiency of the rotary cutting device 20 is high, so that the mowing efficiency of the mower 30 is higher.

The present application is intended to cover various modifications, equivalent arrangements, and adaptations of the present application without departing from the spirit and scope of the present application.

Claims (10)

1. A cutting assembly, comprising:

the blade is driven by an external driving device to rotate around a shaft and form a cutting area; the blade is provided with a working end surface facing to an object to be cut;

a guard disposed on one side of the working end surface of the blade, the guard having an escape area;

the minimum distance from the outer contour of the protection part to the rotating shaft of the driving device is larger than or equal to the outer diameter of the cutting area; in a plane perpendicular to the rotating shaft of the driving device, the projection of the cutting area is at least partially overlapped with the projection of the keep-out area.

2. The cutting assembly of claim 1, wherein: the cutting assembly further comprises a cutter disc, the cutter disc is driven by the driving device to rotate around the shaft, and the blades are arranged on the cutter disc.

3. The cutting assembly of claim 1, wherein: the protection piece is an isolation guard plate, at least one opening is formed in the isolation guard plate, and the opening is combined to form the space avoiding area.

4. The cutting assembly of claim 1, wherein: the protection piece includes disk body and a plurality of rib, each the rib along the week side interval setting of disk body, every adjacent two the clearance between the rib forms jointly keep away the dead zone.

5. The cutting assembly of claim 4, wherein: the guard also includes a reinforcing structure for fixed connection to the ribs.

6. The cutting assembly of claim 5, wherein: the reinforcing structure is a ring strip, the ring strip is connected with each rib, and each rib is provided with a protruding part protruding out of the ring strip.

7. The cutting assembly of claim 1, wherein: the protection piece is an isolation protective net, and meshes of the isolation protective net form the space avoiding area.

8. The cutting assembly of claim 2, wherein: the protection piece is connected with the cutter head so as to enable the protection piece to synchronously rotate the cutter head in the same direction;

or the protecting piece is connected with the cutter head so that the protecting piece can synchronously rotate in the reverse direction with the rotation of the cutter head;

or the protecting piece is used for being connected with the cutter head, so that the protecting piece can keep still in synchronization with the rotation of the cutter head.

9. A rotary cutting apparatus, characterized in that: the cutting assembly of any one of claims 1 to 8, comprising a connecting member, a driving member, and the cutting assembly, wherein the driving member is disposed on the connecting member, an output end of the driving member is connected to the cutting assembly, and the driving member is configured to drive the blade to rotate.

10. A lawnmower, comprising: the lawn mower comprising at least the rotary cutting apparatus of claim 9.

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