Cutting disc, grass mulching structure and lawnmower

Abstract

Cutting disc, grass mulching structure and lawnmower. The present invention discloses a cutting disc, a grass mulching structure and a lawnmower, the cutting disc comprising: a disc body (4) and blades (6), the disc body (4) comprising a face A, a face B opposite face A and an edge portion (42); face A of the disc body (4) is provided with a central portion (43) connected to a rotating drive element; the edge portion of the disc body (42) can be connected to a mowing tool (1); the blades (6) are arranged on face A of the disc body (4) and are fixedly connected to face A of the disc body (4). Figure for the abstract: Figure 2

Description

Title of the invention: Cutting disc, grass shredding structure and lawnmower. Technical field

[0001] The present invention relates to the technical field of lawnmower accessories, in particular a cutting disc, a grass shredding structure and a lawnmower. TECHNICAL CONTEXT

[0002] With the popularity of urban greening and home gardening, lawnmowers have already become an indispensable tool for the maintenance of lawns and vegetation;

[0003] For existing lawnmowers, in particular robotic lawnmowers, the mowing part consists of a cutting disc and blades provided around the cutting disc; a motor drives the cutting disc to rotate, so that the cutting disc drives the blades to rotate to perform the mowing;

[0004] During the mowing process, grass sap flows out once crushed, or water adheres to the pieces of grass, causing the pieces of grass to form grass balls under the adhesion of the sap or water, and these grass balls are evacuated from the robotic lawnmower. Such grass balls not only affect the aesthetics of the lawn, but also accumulate on the lawn, affecting on the one hand the air permeability and drainage of the lawn, on the other hand increasing the work steps of cleaning the grass balls and affecting the user experience of the robotic lawnmower. DISCLOSURE OF THE INVENTION

[0005] To overcome the drawbacks of the existing art, the present invention provides a cutting disc, a grass mulching structure and a lawnmower

[0006] A first technical solution adopted by the present invention to solve the technical problems is as follows:

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

[0008] - the disc body comprises a face A of the disc body, a face B of the body disk opposite face A of the disk body and a portion of the disk body edge;

[0009] - face A of the disc body is provided with a central portion connected to an element rotary drive;

[0010] - the edge portion of the disc body is suitable for being connected to a mowing tool; and

[0011] - the blades are arranged on face A of the disc body and are connected in such a way fixed to side A of the disc body.

[0012] Advantageously, for the above cutting disc, several blades are provided and are arranged radially from the central portion of the disc body towards the edge portion of the disc body.

[0013] Advantageously, for the above cutting disc, the blades are distributed at a regular interval on the disc body.

[0014] Advantageously, for the above cutting disc, the blades are arc-shaped.

[0015] Advantageously, for the above cutting disc, the blade comprises an end E of the blade close to the central portion and an end F of the blade close to the edge of the disc body; the height of the blade gradually increases from end E of the blade to end F of the blade.

[0016] Advantageously, for the above cutting disc, the blade comprises a face C of the blade and a face D of the blade, and the slope of the face C of the blade with respect to the surface of the disc body increases progressively from the end E of the blade to the end F of the blade.

[0017] Advantageously, for the above cutting disc, the bending of the blade increases progressively from end E of the blade to end F of the blade.

[0018] Advantageously, for the above cutting disc, the end F of the blade is located on the same vertical axis as the edge portion of the disc body.

[0019] Advantageously, for the above cutting disc, the blade further comprises a blade apex located between the face C of the blade and the face D of the blade;

[0020] The end F of the blade includes a portion exposed to the wind, one end of the portion exposed to the wind is connected to the edge portion of the disc body and the other end of the portion exposed to the wind is connected to the top of the blade.

[0021] Advantageously, for the above cutting disc, the portion exposed to the wind is tangent to the periphery of the disc body.

[0022] Advantageously, for the above cutting disc, the distance between face C of the blade and face D of the blade increases progressively from the blade tip to the direction of face A of the disc body.

[0023] Advantageously, for the above cutting disc, face A of the disc body is arranged obliquely from the central portion to the edge portion of the disc body.

[0024] Advantageously, for the above cutting disc, the cutting tool is removably connected to the disc body.

[0025] Advantageously, the cutting tool is connected to the disc body via an engagement clasp.

[0026] Advantageously, for the above cutting disc, the cutting tool includes blades, a linking seat and an engagement clasp;

[0027] - the blades are rotationally connected on the connecting seat;

[0028] - the engagement clasp is fixedly located on the connecting seat; and

[0029] - the disc body is provided with an engagement groove corresponding to the clasp commitment.

[0030] A second technical solution adopted by the present invention to solve the technical problems is as follows:

[0031] - a grass shredding structure includes a cutting disc as described below- above and a protective sheath on face A of the disc body and on the edge portion of the disc body;

[0032] - the protective casing is provided with several air guide holes arranged in along the circumference of the cutting disc.

[0033] A third technical solution adopted by the present invention to solve the technical problems is as follows:

[0034] A lawnmower includes a cutting disc as described above or a grass mulching structure as described above.

[0035] The present invention has the following beneficial effects:

[0036] By arranging the blades on face A of the disc body, during rotation of the cutting disc, the blades also rotate simultaneously, which makes it possible to generate an airflow to achieve the grinding of the grass; and to reduce the formation of grass balls. DESCRIPTION OF THE FIGURES

[0037] The present invention can be described in more detail below by means of the accompanying figures and embodiments:

[0038] [Fig. 1] is a diagram of the linkage relationship of the cutting disc, the mowing tool and the rotating drive element according to the present invention;

[0039] [Fig.2] is a top view of the cutting disc and the mowing tool according to the present invention;

[0040] [Fig.3] is a three-dimensional structural diagram of the cutting disc and the mowing tool according to the present invention;

[0041] [Fig.4] is a three-dimensional view of the mowing tool according to the present invention;

[0042] [Fig.5] is an exploded view of the mowing tool according to the present invention;

[0043] [Fig.6] is a structural diagram before the connection between one side of the cutting disc provided with the first engagement groove and the second engagement groove and the mowing tool according to the present invention;

[0044] [Fig.7] is a structural diagram after the connection between one side of the cutting disc provided with the first engagement groove and the second engagement groove and the mowing tool according to the present invention;

[0045] [Fig-8] is a structural diagram before the connection between one side of the cutting disc provided with the third engagement groove and the mowing tool according to the present invention;

[0046] [Fig.9] is a structural diagram after the connection between one side of the cutting disc provided with the third engagement groove and the mowing tool according to the present invention;

[0047] The reference numerals for the figures are:

[0048] 1- shearing tool; 10- blade; 11- first blade; 12- second blade; 13- hole connection; 21- engagement clasp; 211- first engagement clasp; 2111- first leg; 212- second engagement clasp; 2121- second leg; 3- connection seat; 31- mounting hole; 32- clamping element; 4- cutting disc; 41- engagement groove; 411- first engagement groove; 412- second engagement groove; 413- third engagement groove; 414- first inclined plane guide groove; 415- second inclined plane slot; 42- disc body edge portion; 43- central portion; 5- screw; 501- threaded shank; 502- screw head; 51- first screw; 52- second screw; 6- blade; 61- blade tip; 62- wind-exposed portion; 7- rotating drive element. DETAILED DESCRIPTION OF THE INVENTION

[0049] The design of the present invention, its specific structure, and the technical effects obtained will be described clearly and completely below with reference to the accompanying embodiments and figures, in order to better understand the objects, features, and effects of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than being exhaustive. Other embodiments based on the embodiments of the present invention and obtained by those skilled in the art without creative work must be included within the scope of the present invention.Furthermore, all the coupling / connection relationships involved in the present invention do not only refer to the direct connection of components, but also to the formation of improved connection structures by adding or reducing connecting accessories according to specific implementations, thus forming a better connection structure. The technical features of the present invention can be combined with each other without contradiction.

[0050] With reference to figures 1 to 3, a cutting disc comprises: a disc body 4 and blades 6;

[0051] - the disc body 4 comprises a face A of the disc body, a face B of the body of disk opposite face A of the disk body and a portion of the edge of the disk body 42;

[0052] - face A of the disc body is provided with a central portion 43 connected to a rotary drive element 7;

[0053] - the edge portion of the disc body 42 can be connected to a mowing tool 1; and

[0054] - the blades 6 are arranged on face A of the disc body and are connected in such a way fixed to side A of the disc body.

[0055] The output end of the rotary drive element 7 is connected to the central portion 43, the rotary drive element 7 starts and drives the cutting disc to rotate, the air molecules above face A of the disc body are pushed by the blades 6 with the rotation of the blades 6, consequently, the air flow increases and the pressure decreases, a pressure differential with respect to the environment is generated at face A of the disc body, and the pressure differential causes the air to flow from a high pressure zone (the periphery of the disc body) to a low pressure zone (face A of the disc body);

[0056] During mowing, the mowing tool 1 rotates to produce a centrifugal force, so that at the moment of cutting, light pieces of grass are projected upwards in the tangential direction of the rotation of the cutting disc under the action of the centrifugal force, some pieces of grass are projected into the high pressure zone, and some pieces of grass are projected into the low pressure zone; the pieces of grass located in the high pressure zone move towards the low pressure zone under the action of the pressure differential, at this moment there are more pieces of grass on face A of the disc body, and under the action of the blades 6, the air flow to face A of the disc body is high, and the high air flow agitates the pieces of grass in order to avoid their agglomeration, thus reducing the formation of grass balls;Next, some of the grass clippings are projected outside the cutting disc under the action of centrifugal force and the gravity of the disc body 4 and the blades 6, which allows the mowing, grass removal and mulching to be completed simultaneously, thus reducing the formation of grass balls; moreover, when the grass clippings processed by the cutting disc fall back onto the lawn, they are in a loose state, therefore the air permeability and drainage of the lawn are not affected.

[0057] Therefore, it can be seen that when using the cutting disc in the present embodiment, face B of the disc body is oriented towards the lawn, and face A of the disc body and the rotating drive element 7 are oriented away from the lawn.

[0058] In particular, the rotary drive element 7 transmits a rotational movement from the energy source to a device on the cutting disc, such as a motor.

[0059] Furthermore, the blades 6 are plural and the blades 6 are arranged radially from the central portion of the disc body 43 towards the edge portion of the disc body 42; the blades 6 can be arranged to extend radially in the direction of the disc body 4 or radially in the direction away from the disc body 4; the multiple blades 6 help to distribute the airflow evenly, improve wind speed and reduce the energy consumption of the rotation of the rotating drive element 7; during rotation of the cutting disc, the air can be pushed more evenly from the central portion 43 to the edge portion of the disc body 42, which reduces the irregularity of the airflow and reduces the formation of turbulence and vortices, thus avoiding excessively strong or weak local airflow; and the influence on the grass evacuation effect;

[0060] in which, the blade 6 can be in the form of a flat blade, a spiral blade, a wing blade and other;

[0061] The number of blades 6 can be from 1 to 2, which allows for a light weight of the cutting disc and reduces the inertia of the rotation of the cutting disc, but as a consequence, the air flow out is low and can lead to a poor effect of grass mulching and evacuation; the number of blades 6 can be from 3 to 10 or even more, this number can be determined according to the surface area of ​​the cutting disc, as long as the number of blades 6 allows the formation of an air flow to achieve the mulching and evacuation of the grass during the rotation of the cutting disc; the cutting disc in the figures is intended for a domestic robotic lawnmower, and limited by the volume of the robotic lawnmower, the number of blades 6 in the figures of the present embodiment is three.

[0062] Preferably, the number of blades 6 is singular; if the number of blades 6 is even, this means that one blade is provided opposite each blade, because the blades have an identical structure, when one of the blades vibrates during rotation, the probability of vibration of the opposite blade will also increase, which amplifies the influence of vibrations on the rotation of the cutting disc, impairs the proper functioning of the cutting disc and affects the effect of mowing, on the contrary, the singular number of blades 6 can avoid this problem.

[0063] In particular, the blades 6 are distributed at regular intervals on the disc body 4 to ensure uniformity and continuity of the airflow; and it helps to maintain the balance of the weight of the cutting disc and to avoid vibrations of the cutting disc due to unequal weight and influence on the effect of mowing.

[0064] In particular, the 6 blades are arc-shaped. Compared to straight blades, the arc-shaped blade has a wider surface area, which means that the contact area with the air is larger and the direction of the airflow formed by the rotation of the cutting disc is stronger, the direction of the airflow is more complex and the grass mulching effect is better.

[0065] In particular, the blade 6 comprises an end E of the blade near the central portion 43 and an end F of the blade near the edge of the disc body 4; the height of the blade 6 gradually increases from tip E to tip F. The height of tip F is greater than the height of tip E, and tip F can push more air to achieve a high airflow. That is, the pressure at tip F is lower than the pressure at tip E. When the grass falls over tip E, the grass moves towards tip F under the pressure differential. Because the distance between tip F and the central portion 43 is greater than the distance between tip E and the central portion 43, the centrifugal force generated at tip F will be greater, so the grass can be projected effectively.

[0066] In particular, the blade 6 comprises a face C of the blade and a face D of the blade, and the slope of the face C of the blade with respect to the surface of the disk body 4 on the horizontal plane increases progressively from the end E of the blade to the end F of the blade; this slope represents an angle α formed by the blade C;The slope of the E end of the blade is low; during the rotation of the cutting disc, air molecules are pushed to be projected in the direction of the centrifugal force at the E end of the blade. Due to the high height of the F end of the blade, once some of the air molecules are projected at the F end of the adjacent blade, they are pushed by the F end of the blade up above the A face of the disc body, in order to form an airflow from the E end of the blade to the F end of the blade. This airflow can cause the pieces of grass to move, further reducing the air pressure at the F end of the blade and improving the grass-cutting effect.

[0067] In particular, the deflection of the blade 6 increases progressively from end E of the blade to end F of the blade. The increase in deflection can further increase the sweep area at end F of the blade and the volume of air during rotation, and increase the air supply distance.

[0068] In particular, face D of the blade is perpendicular to face A of the cutting disc, and the slope and deflection of the blade 6 can be used to measure the shape index of face C of the blade.

[0069] In particular, the end F of the blade is located on the same vertical axis as the edge portion of the disc body 42. That is to say, the end F of the blade and the edge portion of the disc body 42 are arranged next to each other, the mowing tool 1 cuts the pieces of grass, and the pieces of grass thrown upwards are more likely to enter the low pressure zone.

[0070] In particular, the blade 6 further comprises a blade apex 61 located between the face C of the blade and the face D of the blade;

[0071] The end F of the blade comprises a wind-exposed portion 62, one end of the wind-exposed portion 62 being connected to the edge portion of the disc body 42 and the other end of the wind-exposed portion 62 being connected to the blade tip 61. Such connection may refer to the fact that the wind-exposed portion 62 is connected in a smooth transition manner to the edge portion of the disc body 42 and to the blade tip 61; the arrangement of the wind-exposed portion 62 makes it possible to reduce the air resistance to the cutting disc during the rotation of the cutting disc; during the rotation of the cutting disc, the wind-exposed portion 62 can guide the airflow to flow towards the face C of the blade, the face D of the blade and the blade tip 61, reducing the air resistance at the beginning of the rotation of the cutting disc and reducing the energy consumption of the rotating drive element 7.

[0072] In particular, the wind-exposed portion 62 is tangent to the periphery of the disc body 4. When the blade 6 is arc-shaped, the air resistance during the rotation of the blade 6 can be further reduced.

[0073] In particular, the distance between face C of the blade and face D of the blade gradually increases from the tip of the blade 61 to face A of the disc body; that is to say, from the point of view of the cross section, face C of the blade and face D of the blade have an 'A' shape; when the slope of face C of the blade relative to the surface of the disc body 4 and the deflection gradually increase from tip E of the blade to tip F of the blade, the air resistance at tip F of the rotating blade is greater than that at tip E of the blade, the interference of the airflow is stronger, and vibrations are more likely to occur; with long-term use, tip F of the blade is more likely to deform or break, which affects the grass-grinding effect;By increasing the distance between face C of the blade and face D of the blade, the structural integrity of blade 6 can be improved, the vibrations of blade 6 can be reduced, the anti-deformation capacity of blade 6 can be improved, and the risk of blade 6 breakage can be reduced.

[0074] In particular, face A of the disc body is arranged obliquely from the central portion 43 to the edge portion of the disc body 42. Under the action of gravity, air molecules are guided to flow from the central portion 43 to the edge portion of the disc 42, thus forming an airflow from the central portion 43 to the edge portion of the disc 42, and the pieces of grass are guided to move from an area of ​​low centrifugal force (the central portion 43) to an area of ​​high centrifugal force (the edge portion of the disc 42), which helps to evacuate the grass.

[0075] The cutting disc of lawnmowers currently on the market generally uses a fixed cutting tool: with the increasing service life of lawnmowers, the cutting effect becomes poor once the mower blade wears out. worn lawnmower and it is necessary to replace the blade, but because the fixed lawnmower is welded to the cutting disc, the entire cutting disc assembly must be disassembled for blade replacement, and the cutting disc itself has the function of mulching the grass and replacing the cutting disc whose grass mulching structure is not damaged will cause waste;

[0076] With reference to figures 4 to 9, by way of improvement, the cutting tool 1 is removably connected to the disc body 4 for example by insertion, engagement clasp connection, face and others, which is convenient and quick and facilitates the replacement of the cutting tool 1 by the user.

[0077] Taking the example of the engagement clasp connection, the assembly and disassembly will be described in detail below:

[0078] In addition, the shearing tool 1 includes blades 10, a linkage seat 3 and an engagement clasp 21;

[0079] - the blades 10 are rotationally connected to the connecting seat 3;

[0080] - the engagement clasp 21 is fixedly located on the connecting seat 3; and

[0081] - the disc body 4 is provided with an engagement groove 41 corresponding to the engagement clasp 21.

[0082] During the rotation of the disc body 4, the blade 10 is projected under the effect of centrifugal force for mowing; when it is necessary to operate parts around the disc body 4, the blade 10 can be rotated to a suitable position for operation, in order to avoid any bodily injury caused by the blade 10.

[0083] In particular, the engagement clasp 21 comprises a first engagement clasp 211 disposed on the left side of the blade 10 and a second engagement clasp 212 disposed on the right side of the blade 10;

[0084] - the first engagement clasp 211 is provided with a first lug 2111, the second engagement clasp 212 is provided with a second lug 2121, and the first lug 2111 and the second lug 2121 can be in the shape of a semi-circular projection or a wedge;

[0085] - the first engagement clasp 211 and the second engagement clasp 212 can be made of materials with a restoring force; for example, polyadiohexylenediamine and modified ABS plastics; and

[0086] - the engagement groove 41 comprises a first engagement groove 411 and a second engagement groove 412, the first engagement groove 411 and the second engagement groove 412 open towards the circumferential direction of the disc body 4, the first engagement groove 411 corresponds to the first leg 2111 and the second engagement groove 412 corresponds to the second leg 2121.

[0087] Such a design allows the user to operate with one hand, referring to [Fig.6], to mount the tool entirely, resist the first engagement clasp 211 and the second engagement clasp 212 respectively with the thumb and forefinger, exert a force to press the first engagement clasp 211 and the second engagement clasp 212 in order to deform both, push the first tab 2111 and the second tab 2121 into the first engagement groove 411 and the second engagement clasp groove 412 and release; because the first engagement clasp 211 and the second engagement clasp 212 have a return force, when released, the first engagement clasp 211 and the second engagement clasp 212 are returned, in order to fix the cutting tool on the disc body, and the state is shown in [Fig.7]; to remove the cutting tool, reverse the above process.

[0088] The blade 10 is fixedly connected to the middle of the connecting seat 3, the first engagement clasp 211 is connected to the left side of the connecting seat 3 and the second engagement clasp 212 is connected to the right side of the connecting seat 3; the first engagement clasp 211 and the second engagement clasp 212 are arranged on either side of the blade to provide the blade 10 with better balance;

[0089] Because the blade 10 is the main consumable in the structure of the mowing tool, the blade 10 is removably connected to the connecting seat 3. When the blade 10 is worn, it is simply replaced without mounting the connecting seat 3, which further reduces material waste.

[0090] In particular, a screw 5 is also provided, the screw 5 has a threaded shank 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 in the blade 10;

[0091] The diameter of the connecting hole 13 is greater than the diameter of the threaded rod 501 and less than the diameter of the screw head 502;

[0092] The threaded rod 501 passes through the connecting hole 13 and the mounting hole 31, so that the movement position of the blade 10 is limited between the screw head 502 and the connecting seat 3.

[0093] In particular, a nut 311 can be mounted in the mounting hole 31, or an internal thread corresponding to the threaded rod 501 can be provided on the inner wall of the mounting hole 31;

[0094] The threaded rod 501 is screwed into the nut 311 or the mounting hole 31 and is fixedly connected to the connecting seat 3.

[0095] In particular, the blade 10 comprises a first blade 11 disposed at the upper part of the connecting seat 3 and a second blade 12 disposed at the lower part of the connecting seat 3;

[0096] The screw 5 comprises a first screw 51 disposed at the upper part of the connecting seat 3 and a second screw 52 disposed at the lower part of the connecting seat 3.

[0097] The arrangement of the double blades makes it possible to increase the amount of cutting; because the first blade 11 is rotationally connected to the connecting seat 3 by taking the first screw 51 as its center and the second blade 12 is rotationally connected to the connecting seat 3 by taking the second screw 52 as its center, when the first blade 11 is working, the second blade 12 can also work at the same time.

[0098] With reference to figures 8 and 9, in particular, a clamping element 32 is also provided, the clamping element 32 is fixedly connected to the connecting seat 3, and the clamping element 32 is disposed between the first engagement clasp 211 and the second engagement clasp 212;

[0099] In addition, the engagement groove 41 includes a first engagement groove 411, a second engagement groove 412, a first inclined plane guide groove 414 and a second inclined plane slot 415 opening towards the circumferential direction of the disc body 4;

[0100] The first engagement groove 411 and the second engagement groove 412 are both arranged on one side of the disc body 4, and a third engagement groove 413 is arranged on the other side of the disc body 4;

[0101] The clamping element 32 can correspond to the third engagement groove 413. The clamping element 32 cooperates with the first engagement clasp 211 and the second engagement clasp 212 to fix the cutting tool in the direction of the height of the disc body 4, which further improves the holding of the mounting of the connecting seat 3 and the disc body 4.

[0102] The first engagement groove 411 is adjacent to the first inclined plane guide groove 414; the first engagement groove 411 and the first inclined plane guide groove 414 are arranged successively in the circumferential direction of the disc body 4 oriented by the center of the disc body 4;

[0103] The second engagement groove 412 is adjacent to the second inclined plane guide groove 415; the second engagement groove 412 and the second inclined plane guide groove 415 are arranged successively in the circumferential direction of the disc body 4 oriented by the center of the disc body 4.

[0104] The second engagement groove 412 and the second inclined plane guide groove 415 can guide the first engagement clasp 211 and the second engagement clasp 212 to deform in order to engage in the first engagement groove 411 and the second engagement groove 412.

[0105] A grass shredding structure, includes the above cutting disc and a protective sheath sheathed on face A of the disc body and on the edge portion of the disc body 42 (not shown in the figure);

[0106] The protective cover is provided with several air guide holes arranged along the circumference of the cutting disc (not shown in the figure). When the disc body is located within the protective cover, the grass clippings, when thrown upwards, can collide with the inner wall of the protective cover and rebound off face A of the disc body; by positioning the protective cover, the air exiting the blade 6 forms a high-speed airflow between the inner wall of the protective cover and face A of the disc body, which further disturbs the grass clippings and reduces the probability of grass clumping.

[0107] A lawnmower includes the above cutting disc or grass mulching structure and the above structure gives it the above advantages.

[0108] The above description is intended to explain preferred embodiments of the present invention, but the present invention is not limited to the above embodiments; any variations or replacements may be made by a person skilled in the art who is well acquainted with the technical field without departing from the scope of the present invention, and such variations or replacements must be included within the scope of the present invention.

Claims

Demands

1. Cutting disc, characterized in that it comprises: - a disc body (4) and blades (6); - the disc body (4) comprises a face A of the disc body, a face B of the disc body opposite face A of the disc body and a disc body edge portion (42); - face A of the disc body is provided with a central portion (43) connected to a rotating drive element (7); - the disc body edge portion (42) is adapted to be connected to a cutting tool (1); and - the blades (6) are arranged on face A of the disc body and are fixedly connected to face A of the disc body.

2. Cutting disc according to claim 1, characterized in that several blades (6) are provided and the blades (6) are arranged radially from the central portion of the disc body (43) to the edge portion of the disc body (42).

3. Cutting disc according to claim 2, characterized in that the blades (6) are distributed at a regular interval on the disc body (4).

4. Cutting disc according to claim 1 or 2, characterized in that the blades (6) are arc-shaped.

5. Cutting disc according to claim 4, characterized in that the blade (6) comprises an end E of the blade close to the central portion (43) and an end F of the blade close to the edge of the disc body (4); the height of the blade (6) increases progressively from the end E of the blade to the end F of the blade.

6. Cutting disc according to claim 5, characterized in that the blade (6) comprises a face C of the blade and a face D of the blade, and the slope of the face C of the blade with respect to the surface of the disc body (4) increases progressively from the end E of the blade to the end F of the blade.

7. Cutting disc according to claim 5 or 6, characterized in that the bending of the blade (6) increases progressively from the end E of the blade to the end F of the blade.

8. Cutting disc according to claim 5 or 6, characterized in that the end F of the blade is located on the same vertical axis as the edge portion of the disc body (42).

9. Cutting disc according to claim 5, characterized in that the blade (6) further comprises a blade crest (61) located between the face C of the blade and the face D of the blade; the end F of the blade comprises a wind-exposed portion (62), one end of the wind-exposed portion (62) is connected to the edge portion of the disc body (42) and the other end of the wind-exposed portion (62) is connected to the blade crest (61).

10. Cutting disc according to claim 9, characterized in that the portion exposed to the wind (62) is tangent to the periphery of the disc body (4).

11. Cutting disc according to claim 9, characterized in that the distance between face C of the blade and face D of the blade increases progressively from the blade tip (61) to the direction of face A of the disc body.

12. Cutting disc according to claim 9, characterized in that the face A of the disc body is arranged obliquely from the central portion (43) to the edge portion of the disc body (42).

13. Cutting disc according to claim 1, characterized in that the cutting tool (1) is removably connected to the disc body (4).

14. Cutting disc according to claim 13, characterized in that the cutting tool (1) is connected to the disc body (4) via an engagement clasp.

15. Cutting disc according to claim 14, characterized in that the cutting tool (1) comprises blades (10), a connecting seat (3) and an engagement clasp (21); - the blades (10) are rotationally connected on the connecting seat (3); - the engagement clasp (21) is fixedly located on the connecting seat (3); and - the disc body (4) is provided with an engagement groove (41) corresponding to the engagement clasp (21).

16. Grass shredding structure, characterized in that it comprises a cutting disc according to any one of claims 1 to 15 and a protective sheath sheathed on face A of the disc body and on the edge portion of the disc body (42); the protective sheath is provided with several air guide holes arranged along the circumference of the cutting disc.

17. Lawn mower, characterized in that it comprises a cutting disc according to any one of claims 1 to 15 or a grass mulching structure according to claim 16.

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