Cutter head, grass chopping structure and mower

Abstract

The utility model discloses a cutterhead, a grass chopping structure and a mower. The cutterhead comprises a cutterhead body and fan blades, the tray body comprises a tray body A surface, a tray body B surface opposite to the tray body A surface and a tray body edge part; a central part connected with the rotary driving piece is arranged on the surface A of the disc body; the edge part of the disc body can be connected with a mowing knife; the fan blades are arranged on the surface A of the disc body and are fixedly connected with the surface A of the disc body; the grass chopping structure comprises the cutterhead and a protective cover arranged on the A face of the cutterhead body and the edge portion of the cutterhead body in a sleeving mode. A plurality of air guide holes are formed in the protective cover in the circumferential direction of the cutter head; the mower is provided with the cutter head or the grass chopping structure. The fan blades are arranged on the surface of the fan blade A, and when the cutter head rotates, the fan blades rotate together, so that airflow is generated to realize grass chopping; grass cluster formation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mower accessories, in particular to a cutter disc, a grass chopping structure and a lawn mower. Background Art

[0002] With the popularity of urban greening and home gardening, lawn mowers have become an indispensable tool for maintaining lawns and vegetation;

[0003] The existing lawn mower, especially the lawn mower robot, has a lawn mowing part composed of a cutter disc and blades connected around the cutter disc; the motor drives the cutter disc to rotate, and the cutter disc drives the blades to rotate to complete the lawn mowing;

[0004] During the mowing process, the juice in the grass will flow out after the grass is chopped, or the grass clippings will be stained with water, which will cause the grass clippings to become grass balls under the stickiness of the juice or water. The grass balls are discharged from the lawn mower robot. These grass balls not only affect the aesthetics of the lawn, but also accumulate on the lawn, affecting the air permeability and drainage of the lawn, and also increasing the work steps of cleaning the grass balls, affecting the user experience of the lawn mower robot. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a cutter disc, a grass chopping structure and a lawn mower which can reduce the formation of grass balls.

[0006] The first technical solution adopted by the utility model to solve its technical problem is:

[0007] A cutter disc comprises: a disc body and fan blades;

[0008] The disk body comprises a disk body A surface, a disk body B surface opposite to the disk body A surface, and a disk body edge portion;

[0009] The disk body A is provided with a central portion connected to the rotating drive member;

[0010] The edge of the disk body may be connected to a mowing blade;

[0011] The fan blades are arranged on the surface A of the disk body and are fixedly connected to the surface A of the disk body.

[0012] As described above, the blades of the cutter disc are multiple and are arranged radially from the center of the disc body to the edge of the disc body.

[0013] In the blade disc as described above, the blades are evenly distributed on the disc body.

[0014] In the blade disc as described above, the fan blades are arranged in an arc shape.

[0015] As described above, the blade of the cutter disc includes a blade E end close to the center and a blade F end close to the edge of the disc body; the height of the blade increases from the blade E end to the blade F end.

[0016] In the blade disc as described above, the blade includes a blade C surface and a blade D surface, and the slope of the blade C surface relative to the disc body surface increases from the blade E end to the blade F end.

[0017] As for the cutter disc as described above, the torsion of the blade increases gradually from the E end of the blade to the F end of the blade.

[0018] As for the cutter disc as described above, the end F of the blade and the edge of the disc body are located on the same vertical axis.

[0019] The blade disc as described above, wherein the blade further comprises a blade top located between the blade C surface and the blade D surface;

[0020] The F end of the fan blade includes a windward portion, one end of which is connected to the edge of the disk body, and the other end of which is connected to the top of the fan blade.

[0021] In the impeller as described above, the windward portion is tangent to the periphery of the impeller body.

[0022] As for the cutter disc as described above, the distance between the blade C surface and the blade D surface increases gradually from the top of the blade to the disc body A surface.

[0023] As described above, the cutter disc, the disc body A surface is inclined from the center to the edge of the disc body.

[0024] As for the cutter disc as described above, the mowing blade is connected to the cutter disc via a buckle.

[0025] The blade disc as described above, the mowing blade comprises a blade, a connecting seat and a buckle;

[0026] The blade is rotatably connected to the connecting seat;

[0027] The buckle is fixed on the connecting seat;

[0028] The disc body is provided with a clamping groove matched with the clamping buckle.

[0029] The second technical solution adopted by the utility model to solve its technical problem is:

[0030] A grass-chopping structure, comprising the above-mentioned blade disc and a shield sleeved on the A surface of the disc body and the edge of the disc body;

[0031] The guard is provided with a plurality of air guide holes along the circumference of the cutter disc.

[0032] The third technical solution adopted by the utility model to solve its technical problem is:

[0033] A lawn mower has the above-mentioned blade disc or the above-mentioned grass-chopping structure.

[0034] The beneficial effects of the utility model are:

[0035] By setting the fan blades on the A side of the fan blades, when the blade disc rotates, the fan blades also rotate together, thereby generating airflow to chop the grass and reduce the formation of grass balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Figure 1 It is a schematic diagram of the connection relationship between the cutter disc, the mowing blade and the rotating drive member in the utility model;

[0038] Figure 2 It is a top view of the knife disc and the mowing knife in the utility model;

[0039] Figure 3 It is a three-dimensional structural schematic diagram of the knife disc and the mowing knife in the utility model;

[0040] Figure 4 It is a three-dimensional diagram of the mowing knife in the utility model;

[0041] Figure 5 It is an exploded view of the mowing knife in the utility model;

[0042] Figure 6 It is a schematic structural diagram of the utility model before the blade disc is connected to the mowing blade on one side provided with the first buckle groove and the second buckle groove;

[0043] Figure 7 It is a schematic structural diagram of the utility model after one side of the blade disc provided with the first buckle groove and the second buckle groove is connected with the mowing blade;

[0044] Figure 8 It is a schematic structural diagram of the utility model before the blade disc is provided with a third slot and connected to the mowing blade;

[0045] Fig. 9 It is a schematic structural diagram of the utility model in which the blade disc is provided with a third slot and connected to the mowing blade;

[0046] The markings in the accompanying drawings are as follows:

[0047] 1-mower blade; 10-blade; 11-first blade; 12-second blade; 13-connecting hole; 21-buckle; 211-first buckle; 2111-first lug; 212-second buckle; 2121-second lug; 3-connecting seat; 31-mounting hole; 32-clamp; 4-cutter disc; 41-slot; 411-first buckle slot; 412-second buckle slot; 413-third slot; 414-first inclined guide groove; 415-second inclined guide groove; 42-edge of disc; 43-center; 5-screw; 501-threaded rod; 502-screw head; 51-first screw; 52-second screw; 6-blade; 61-top of blade; 62-windward part; 7-rotating drive member. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0049] Reference Figures 1 to 3 , a cutter disc, comprising: a disc body 4 and a fan blade 6;

[0050] The disk body 4 includes a disk body A surface, a disk body B surface opposite to the disk body A surface, and a disk body edge portion 42;

[0051] The surface A of the disk body is provided with a central portion 43 connected to the rotary drive member 7;

[0052] The disc edge portion 42 may be connected to a mowing blade 1;

[0053] The fan blades 6 are arranged on the surface A of the disc body and are fixedly connected to the surface A of the disc body. The output end of the rotary drive member 7 is connected to the central portion 43. The rotary drive member 7 is started to drive the cutter disc to rotate. As the fan blades 6 rotate, the air molecules on the surface A of the disc body are pushed by the fan blades 6, the air flow rate increases, and the pressure decreases, generating a pressure difference between the surface A of the disc body and the surrounding environment. The pressure difference causes the air to flow from the high-pressure area (the periphery of the disc body) to the low-pressure area (the surface A of the disc body);

[0054] When mowing the lawn, the mowing blade 1 rotates to generate centrifugal force, which will cause the light grass clippings to be thrown upward along the tangential direction of the rotation of the blade disc under the action of centrifugal force at the moment of being cut, with some grass clippings being thrown into the high-pressure area and some grass clippings being thrown into the low-pressure area; some of the grass clippings in the high-pressure area will move to the low-pressure area under the action of the pressure difference. At this time, there are more grass clippings on the surface A of the disc body. Under the action of the fan blades 6, the air flow speed on the surface A of the disc body is fast, and the high-speed air is used to stir the grass clippings to prevent them from agglomerating, thereby reducing the formation of grass balls; subsequently, some grass clippings will be thrown out of the disc under the action of the centrifugal force of the disc body 4 and the fan blades 6 and the action of gravity, so that mowing, removing grass and chopping grass can be completed at the same time, thereby reducing the formation of grass balls; and when the grass clippings processed by the disc fall back onto the lawn, they are in a loose state, so they will not affect the air permeability and drainage of the lawn.

[0055] Therefore, it can be seen that when the blade disc in this embodiment is in use, the blade disc body B surface is facing the lawn, and the blade disc A surface and the rotary drive member 7 are facing away from the lawn.

[0056] Specifically, the rotary drive member 7 transmits the rotary motion of the power source to a device of the cutter disc, such as a motor.

[0057] Furthermore, there are a plurality of blades 6, which are radially arranged from the center 43 of the disc body to the edge 42 of the disc body; the blades 6 can be arranged to extend radially along the disc body 4, or can be arranged to deviate from the radial direction of the disc body 4; a plurality of blades 6 are helpful to evenly distribute the airflow, increase the wind speed and reduce the rotational energy consumption of the rotating drive member 7; when the blade disc rotates, the air can be pushed more evenly from the center 43 to the edge 42 of the disc body, reducing the unevenness of the airflow, reducing the formation of turbulence and eddies, thereby avoiding excessive or weak airflow in local areas, affecting the grass removal effect;

[0058] The fan blade 6 may be in the shape of a plane fan blade, a spiral fan blade, an airfoil fan blade, etc.

[0059] The number of fan blades 6 can be 1-2, which makes the cutter disc light and can reduce the inertia of the cutter disc when it rotates, but correspondingly, the small air output will lead to poor grass chopping and grass removal effects; the number of fan blades 6 can also be 3-10 or even more, and the number can be selected according to the area of ​​the cutter disc, as long as the number of fan blades 6 can be maintained to form an airflow to achieve grass chopping and grass removal when the cutter disc rotates; the cutter disc in the attached figure is used for a household lawn mowing robot. Due to the size limitation of the lawn mowing robot, the number of fan blades 6 in the attached figure of this embodiment is three.

[0060] Preferably, the number of fan blades 6 is odd; when the number of fan blades 6 is even, it means that there is a fan blade opposite each fan blade. Since the structures of the fan blades are the same, when one of the fan blades rotates and vibrates, the probability of the fan blade opposite to it vibrating will also be greater, thereby amplifying the impact of the vibration on the rotation of the cutter disc, affecting the smooth operation of the cutter disc, and thus affecting the mowing effect. The odd number of fan blades 6 can avoid the occurrence of this problem.

[0061] Specifically, the fan blades 6 are evenly distributed on the disc body 4 to ensure the uniformity and continuity of the airflow; and it is beneficial to maintain the weight balance of the blade disc to avoid vibration of the blade disc due to uneven weight and affect the mowing effect.

[0062] Specifically, the fan blades 6 are arranged in an arc shape. Compared with the straight fan blades, the arc-shaped fan blades have a larger surface area, which means that the area in contact with the air is larger, and the airflow direction formed when the blade disc rotates is stronger and more complex, and the grass chopping effect is better.

[0063] More specifically, the blade 6 includes a blade E end near the center portion 43 and a blade F end near the edge of the disk body 4; the height of the blade 6 increases from the blade E end to the blade F end. The height of the blade F end is greater than the height of the blade E end, and the blade F end can push a larger amount of air, thereby generating a larger amount of wind. In other words, the pressure at the blade F end is lower than the pressure at the blade E end. For example, when grass clippings fall above the blade E end, the grass clippings move toward the blade F end under the action of the pressure difference; and because the distance from the blade F end to the center portion 43 is greater than the distance from the blade E end to the center portion 43, the centrifugal force generated by the blade F end will be greater, and the grass clippings can be effectively thrown out.

[0064] More specifically, the fan blade 6 includes a fan blade C surface and a fan blade D surface, and the slope of the fan blade C surface relative to the surface and the horizontal plane of the disk body 4 surface increases from the fan blade E end to the fan blade F end; this slope represents the angle α of the fan blade C; the slope of the fan blade E end is low, and when the blade disc rotates, the gas molecules are pushed out along the centrifugal force direction of the fan blade E end. Due to the large height of the fan blade F end, some of the thrown gas molecules flow to the adjacent fan blade F end, and are pushed to the top of the disk body A surface by the fan blade F end, thereby forming an airflow from the fan blade E end to the fan blade F end. This airflow can drive the grass clippings to move, further reduce the air pressure at the fan blade F end, and improve the grass chopping effect.

[0065] More specifically, the torsion of the blade 6 increases from the blade E end to the blade F end. The increase in torsion can further increase the wind sweeping area of ​​the blade F end and the wind volume during rotation, thereby increasing the air supply distance.

[0066] Specifically, the blade D surface is perpendicular to the blade A surface, and the slope and torsion of the blade 6 are indicators used to measure the shape of the blade C surface.

[0067] More specifically, the end of the blade F and the edge of the disk body 42 are located on the same vertical axis. That is, the end of the blade F and the edge of the disk body 42 are arranged adjacent to each other, and the mowing blade 1 cuts grass clippings, which are thrown upward and are more likely to enter the low-pressure area.

[0068] More specifically, the fan blade 6 further includes a fan blade top 61 located between the fan blade C surface and the fan blade D surface;

[0069] The end of the blade F includes a windward portion 62, one end of which is connected to the edge portion 42 of the disc body, and the other end of which is connected to the top 61 of the blade. This connection may mean that the windward portion 62 is a smooth transition connecting the edge portion 42 of the disc body and the top 61 of the blade; the setting of the windward portion 62 can reduce the resistance of the air to the blade when the blade rotates; when the blade rotates, the windward portion 62 can guide the gas to flow to the C surface, the D surface and the top 61 of the blade, reducing the resistance of the air in the initial stage of the blade rotation, and reducing the energy consumption of the rotating drive 7.

[0070] More specifically, the windward portion 62 is tangent to the periphery of the disk body 4. When the fan blade 6 is arc-shaped, the air resistance when the fan blade 6 rotates can be further reduced.

[0071] More specifically, the distance between the blade C surface and the blade D surface increases from the blade top 61 to the disk body A surface; that is, from a cross-section, the blade C surface and the blade D surface are in an "A" shape; when the slope and torsion of the blade C surface relative to the surface of the disk body 4 increase from the blade E end to the blade F end, the air resistance encountered by the blade F end during rotation is greater than that of the blade E end, and is more strongly disturbed by the airflow and is more prone to vibration; with long-term use, the blade F end is more likely to deform or break, affecting the grass-chopping effect; increasing the distance between the blade C surface and the blade D surface can enhance the structural strength of the blade 6, reduce the vibration of the blade 6, improve the deformation resistance of the blade 6, and reduce the risk of breakage of the blade 6.

[0072] More specifically, the surface A of the disk body is inclined from the center portion 43 to the disk body edge portion 42. Under the action of gravity, it helps to guide air molecules from the center portion 43 to the disk body edge portion 42, forming an airflow from the center portion 43 to the disk body edge portion 42, guiding grass clippings from a place with low centrifugal force (center portion 43) to a place with high centrifugal force (disk body edge portion 42), which helps to remove grass.

[0073] At present, the blades of lawn mowers on the market usually use fixed mowers. As the lawn mower is used for a longer time, the mowing effect is poor after the blades of the mowers are worn out, and the mowers need to be replaced. However, since the fixed mowers are welded on the blade, the entire blade needs to be disassembled when replacing the mowers. However, the blade itself has a grass-chopping function. It is too wasteful to replace the blade when the grass-chopping structure is not damaged.

[0074] Reference Figures 4 to 9 As an improvement, the lawn mower blade 1 and the disk body 4 are detachably connected, such as plug-in, snap-on, screw-on, etc., which is convenient and quick, and facilitates the user to replace the lawn mower blade 1.

[0075] Taking the snap connection as an example, how to achieve detachability is explained in detail:

[0076] Furthermore, the mower 1 comprises a blade 10, a connecting seat 3 and a buckle 21;

[0077] The blade 10 is rotatably connected to the connecting seat 3;

[0078] The buckle 21 is fixed on the connecting seat 3;

[0079] The disc body 4 is provided with a slot 41 matched with the buckle 21 .

[0080] When the disc body 4 rotates, the blade 10 is thrown out to cut grass under the action of centrifugal force. When it is necessary to operate the parts around the disc body 4, in order to avoid being cut by the blade 10, the blade 10 can be rotated to a suitable position for operation.

[0081] Specifically, the buckle 21 includes a first buckle 211 disposed on the left side of the blade 10 and a second buckle 212 disposed on the right side of the blade 11;

[0082] The first buckle 211 is provided with a first lug 2111, and the second buckle 212 is provided with a second lug 2121. The first lug 2111 and the second lug 2121 may be semicircular protrusions or wedge-shaped;

[0083] The first buckle 211 and the second buckle 212 can be made of a material with resilience, such as polyhexamethylene adipamide and modified ABS plastic.

[0084] The snap slot 41 includes a first snap slot 411 and a second snap slot 412. The openings of the first snap slot 411 and the second snap slot 412 are arranged toward the circumferential direction of the disk body 4. The first snap slot 411 is adapted to the first lug 2111, and the second snap slot 412 is adapted to the second lug 2121.

[0085] This design allows the user to operate with one hand. Figure 6 When the lawn mower needs to be installed, the thumb and index finger can respectively press the first buckle 211 and the second buckle 212, apply force to squeeze the first buckle 211 and the second buckle 212 to deform them, push the first lug 2111 and the second lug 2121 into the first buckle groove 411 and the second buckle groove 412, and let go; because the first buckle 211 and the second buckle 212 have rebound force, the first buckle 211 and the second buckle 212 rebound when the hand is released, thereby fixing the lawn mower on the disc body, and the state is referred to as Figure 7 When the mowing blade needs to be removed, the above operation process can be reversed.

[0086] The blade 10 is fixedly connected to the middle of the connection seat 3, the first buckle 211 is connected to the left side of the connection seat 3, and the second buckle 212 is connected to the right side of the connection seat 3; the first buckle 211 and the second buckle 212 are arranged on both sides of the blade, which can provide the blade 11 with better balance;

[0087] Since the blade 10 is the main consumable in the mowing blade structure, the blade 10 is detachably connected to the connecting seat 3. When the blade 10 is worn, the blade 10 can be replaced without installing the connecting seat 3, which further reduces the waste of materials.

[0088] More specifically, it also includes a screw 5, the screw 5 has a threaded rod 501 and a screw head 502, a mounting hole 31 is provided in the middle of the connecting seat 3, and a connecting hole 13 is provided on the blade 11;

[0089] The diameter of the connecting hole 13 is larger than the diameter of the threaded rod 501 and smaller than the diameter of the screw head 502;

[0090] The threaded rod 501 passes through the connecting hole 13 and the mounting hole 31 , so that the movable position of the blade 11 is limited between the screw head 502 and the connecting seat 3 .

[0091] Specifically, a nut 311 may be installed in the mounting hole 31, or the inner wall of the mounting hole 31 may be provided with an internal thread matching the threaded rod 501;

[0092] The threaded rod 501 is screwed into the nut 311 or the mounting hole 31 and is fixedly connected to the connecting seat 3 .

[0093] More specifically, the blade 11 includes a first blade 11 disposed at the top of the connecting seat 3 and a second blade 112 disposed at the bottom of the connecting seat 3;

[0094] The screw 5 includes a first screw 51 disposed on the top of the connecting base 3 and a second screw 52 disposed on the bottom of the connecting base 3 .

[0095] The double-blade setting helps to increase the amount of mowing; since the first blade 11 is rotatably connected to the connecting seat 3 with the first screw 51 as the center, and the second blade 112 is rotatably connected to the connecting seat 3 with the second screw 52 as the center; when the first blade 11 is mowing, the second blade 112 can also mow at the same time.

[0096] Reference Figure 8-Figure 9 More specifically, it also includes a clamping member 32, the clamping member 32 is fixedly connected to the connecting seat 3, and the clamping member 32 is arranged between the first buckle 211 and the second buckle 212;

[0097] Furthermore, the clamping groove 41 includes a first clamping groove 411, a second clamping groove 412, a first inclined surface guide groove 414 and a second inclined surface guide groove 415, which are opened toward the circumferential direction of the disk body 4;

[0098] The first buckle slot 411 and the second buckle slot 412 are both provided on one side of the plate body 4, and a third buckle slot 413 is provided on the other side of the plate body 4;

[0099] The clamping member 32 can be matched with the third clamping groove 413. The clamping member 32 cooperates with the first clamping buckle 211 and the second clamping buckle 212 to fix the mowing blade along the height direction of the disc body 4, further improving the firmness of the installation of the connecting seat 3 and the disc body 4.

[0100] The first buckle groove 411 is adjacent to the first inclined guide groove 414; the first buckle groove 411 and the first inclined guide groove 414 are sequentially arranged along the center of the disk body 4 and in the circumferential direction of the disk body 4;

[0101] The second buckle groove 412 is adjacent to the second inclined guide groove 415 ; the second buckle groove 412 and the second inclined guide groove 415 are sequentially arranged along the center of the disk body 4 and pointing to the circumferential direction of the disk body 4 .

[0102] The second buckle groove 412 and the second inclined guide groove 415 can guide the first buckle 211 and the second buckle 212 to deform and be buckled into the first buckle groove 411 and the second buckle groove 412 .

[0103] A grass-chopping structure, comprising the blade disc as described above and a shield (not shown in the figure) sleeved on the disc body A surface and the disc body edge 42;

[0104] The shield is provided with a plurality of air guide holes (not shown in the figure) along the circumference of the disk body. When the disk body is located in the shield, grass clippings thrown upwards may collide with the inner wall of the shield and rebound to the A surface of the disk body; the shield is provided, and the fan blades 6 discharge wind to form a circulating high-speed airflow between the inner wall of the shield and the A surface of the disk body, further disturbing the grass clippings and reducing the probability of grass balls forming.

[0105] A lawn mower has the above-mentioned blade disc or the above-mentioned grass-chopping structure. Since it has the above-mentioned structure, it also has the above-mentioned advantages.

[0106] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A cutter disc, characterized in that: include: A disk body (4) and a fan blade (6); The disk body (4) comprises a disk body surface A, a disk body surface B opposite to the disk body surface A, and a disk body edge portion (42); The surface A of the disk body is provided with a central portion (43) connected to the rotary drive member (7); The edge portion (42) of the disk body may be connected to a mowing blade (1); The fan blades (6) are arranged on the surface A of the disk body and are fixedly connected to the surface A of the disk body.

2. The cutter head according to claim 1, characterized in that: There are a plurality of fan blades (6), and each fan blade (6) is arranged radially from the center portion (43) of the disk body to the edge portion (42) of the disk body.

3. The cutter head according to claim 2, characterized in that: The fan blades (6) are distributed on the disk body (4) at equal distances.

4. The cutter head according to claim 1 or 2, characterized in that: The fan blades (6) are arranged in an arc shape.

5. The cutter head according to claim 4, characterized in that: The fan blade (6) comprises a fan blade E end close to the central portion (43) and a fan blade F end close to the edge of the disk body (4); the height of the fan blade (6) increases gradually from the fan blade E end to the fan blade F end.

6. The cutter head according to claim 5, characterized in that: The fan blade (6) comprises a fan blade C surface and a fan blade D surface, and the slope of the fan blade C surface relative to the surface of the disk body (4) increases from the fan blade E end to the fan blade F end.

7. The cutter head according to claim 5 or 6, characterized in that: The torsion of the fan blade (6) increases gradually from the fan blade E end to the fan blade F end.

8. The cutter head according to claim 5 or 6, characterized in that: The end portion of the fan blade F and the edge portion (42) of the disk body are located on the same vertical axis.

9. The cutter head according to claim 5, characterized in that: The fan blade (6) further comprises a fan blade top end (61) located between the fan blade C surface and the fan blade D surface; The fan blade F end comprises a windward portion (62), one end of the windward portion (62) is connected to the disk body edge portion (42), and the other end of the windward portion (62) is connected to the fan blade top end (61).

10. The cutter head according to claim 9, characterized in that: The windward portion (62) is tangent to the periphery of the disk body (4).

11. The cutter head according to claim 9, characterized in that: The distance between the blade C surface and the blade D surface increases gradually from the blade top end (61) to the disk body A surface.

12. The cutter head according to claim 9, characterized in that: The disk body A surface is inclined from the center portion (43) to the disk body edge portion (42).

13. The cutter head according to claim 1, characterized in that: The mowing blade (1) is detachably connected to the disc body (4).

14. The cutter head according to claim 13, characterized in that: The mowing blade (1) is connected to the disc body (4) via a buckle.

15. The cutter head according to claim 14, characterized in that: The mowing blade (1) comprises a blade (10), a connecting seat (3) and a buckle (21); The blade (10) is rotatably connected to the connecting seat (3); The buckle (21) is fixedly mounted on the connecting seat (3); The disc body (4) is provided with a clamping groove (41) adapted to the clamping buckle (21).

16. A grass-chopping structure, characterized in that: It comprises a cutter disc as claimed in any one of claims 1 to 15 and a protective cover sleeved on the disc body A surface and the disc body edge portion (42); The guard is provided with a plurality of air guide holes along the circumference of the cutter disc.

17. A lawn mower, characterized in that: The utility model has a blade disc as described in any one of claims 1 to 15 or a grass-chopping structure as described in claim 16.

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