Grass chopping blade and mower
By designing the protrusions of the grass-shredding blades to be smooth curved surfaces, the problem of uneven grass shredding in lawnmowers is solved, achieving low power consumption and high-efficiency grass shredding. The grass blades are evenly scattered after being cut multiple times, without affecting the appearance of the lawn.
Patent Information
- Application Number
- CN202422946685.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-30
AI Technical Summary
Existing lawnmower blades, without a grass clipping bag, produce grass clippings with a large diameter, which affects the appearance of the lawn and hinders its growth.
Design a grass shredder blade, including a middle part and a cutting part. The cutting part has a front side and a rear side. The front side has a cutting edge and a first protrusion and a second protrusion in the length direction. The protrusions bulge in the thickness direction and have smooth curved surfaces on both sides to reduce wind resistance.
By reducing wind resistance, lowering power loss, and improving grass shredding, the grass blades are cut multiple times at different heights, and the shredded grass is evenly distributed without affecting the quality of the lawn.
Smart Images
Figure CN223568120U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of garden tools, in particular to a grass mowing blade and a lawn mower. BACKGROUND
[0002] The lawn mower as a kind of garden tool generally includes a motor and a blade driven to rotate by the motor, and the uneven grass on the lawn is cut to a certain height by the blade to achieve the effect of beautifying the lawn.
[0003] At present, the lawn mower on the market includes two kinds of lawn mower with grass collecting bag and lawn mower without grass collecting bag. After the work of the lawn mower without grass collecting bag is completed, the cut grass is directly laid on the lawn, and if the diameter of the cut grass is large, it will affect the appearance and the subsequent growth of the lawn.
[0004] Therefore, it is necessary to provide an improved grass mowing blade and lawn mower to overcome the defects of the prior art. CONTENT OF THE INVENTION
[0005] In view of the shortcomings of the prior art, the purpose of the present application is to provide a grass mowing blade with good grass mowing effect and low power loss.
[0006] The present application solves the problems of the prior art by using the following technical scheme: a grass mowing blade, comprising: a middle part and cutting parts at both ends, the cutting part has a front side and a back side opposite to each other along the width direction of the middle part, and the front side is provided with a cutting edge; wherein the cutting part is provided with a first protruding part at one end close to the middle part along the length direction, and the first protruding part is protruded from the cutting part along the thickness direction of the middle part; and the opposite sides of the first protruding part along the length direction are configured as continuous smooth curved surfaces.
[0007] In one embodiment, the cutting part is provided with a second protruding part at one end away from the middle part, and the second protruding part is formed by twisting the cutting part relative to the first protruding part; and the twisting direction of the second protruding part and the protruding direction of the first protruding part are towards the same side of the middle part along the thickness direction.
[0008] In one embodiment, along the width direction, the part of the first protruding part close to the front side is higher than the part of the first protruding part close to the back side, so as to form a first curved surface extending downward from the front side to the back side; and along the width direction, the part of the second protruding part close to the front side is lower than the part of the second protruding part close to the back side, so as to form a second curved surface extending upward from the front side to the back side.
[0009] In one of the embodiments, the connection between the intermediate portion, the first curved surface and the second curved surface is configured as a continuous smooth curved surface along the length direction.
[0010] In one of the embodiments, the first convex portion comprises a highest point in the thickness direction on the front side; the second convex portion comprises a highest point in the thickness direction on the back side and a lowest point in the thickness direction on the front side; the highest point in the thickness direction of the second convex portion is lower than the highest point in the thickness direction of the first convex portion.
[0011] In one of the embodiments, the cutting edge is located on the front side of the first convex portion and the second convex portion and is configured to first incline upward from the end of the intermediate portion to form the highest point of the first convex portion and then incline downward to form the lowest point of the second convex portion.
[0012] In one of the embodiments, along the length direction, the highest point in the thickness direction of the first convex portion is close to the middle of the first convex portion along the length direction.
[0013] In one of the embodiments, along the length direction, the bending curvature of the cutting portion is greater than or equal to 0 degree and less than or equal to 220 degrees; and / or, along the width direction, the bending curvature of the cutting portion is greater than or equal to 30 degrees and less than or equal to 172 degrees.
[0014] According to another aspect of the present application, there is provided a mower comprising a bottom shell, a driving mechanism mounted in the bottom shell and a grass cutting blade having any one of the above embodiments, the driving mechanism having a driving shaft for driving the grass cutting blade to rotate.
[0015] In one of the embodiments, the intermediate portion is connected to the driving shaft so that the grass cutting blade rotates around a rotation axis which is parallel to the thickness direction.
[0016] Compared with the prior art, the present application has the following beneficial effects: the grass cutting blade is provided with the first convex portion so that the cutting edge can cut at different positions in the thickness direction, and because the opposite sides of the first convex portion along the length direction are configured as continuous smooth curved surfaces, the airflow circulation is not hindered by the surface of the first convex portion which has a plane inclined at an acute angle, which is beneficial to reduce the wind resistance and further reduce the power loss caused by the wind resistance. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0018] Figure 1 The bottom view of the mower in an embodiment of the present application.
[0019] Figure 2 The bottom view of the grass crushing blade in the embodiment shown. Figure 1
[0020] Figure 3 The top view of the grass crushing blade in the embodiment shown. Figure 1
[0021] Figure 4 The front view of the grass crushing blade in the embodiment shown. Figure 1
[0022] Figure 5 The sectional view of the grass crushing blade in the embodiment shown along the line A-A. Figure 4 Main element symbol explanation:
[0023]
[0024] Lawn mower 1 Grass cutting blade 100 Intermediate portion 10 Cutting portion 20 Front side 20a Rear side 20b Cutting edge 21 First protrusion 22 First curved surface 221 Second protrusion 23 Second curved surface 231 Drive shaft 200 Drive mechanism 300 Bottom shell 400 Length direction X Width direction Y Thickness direction Z DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.
[0026] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed" on another element, it can be directly disposed on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.
[0028] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0029] Example
[0030] Figure 1 This is a bottom view of the lawnmower 1 in one embodiment of this application; Figure 2 for Figure 1 A bottom view of the grass shredder 100 in the illustrated embodiment; Figure 3 for Figure 1 A top view of the grass shredder 100 in the illustrated embodiment; Figure 4 for Figure 1 A front view of the grass shredder 100 in the illustrated embodiment.
[0031] See Figure 1 This application provides a lawnmower 1, which includes a grass-shredding blade 100 for cutting grass blades.
[0032] See Figures 1 to 3 The lawnmower 1 also includes a drive shaft 200 and a drive mechanism 300. The drive shaft 200 is connected to the middle part 10 of the grass-chopping blades 100, and the drive mechanism 300 is connected to the drive shaft 200 to drive the drive shaft 200 to rotate around a rotation axis, the rotation axis being perpendicular to the thickness direction Z (see...). Figure 4 Parallel. Thus, the drive shaft 200 is driven by the drive mechanism 300 to rotate the grass shredder blade 100, so that the cutting edge 21 of the grass shredder blade 100 can be used to trim the lawn. In use, the thickness direction Z of the middle part 10 can be the height direction of the grass blade, for example, the thickness direction Z can be the direction of gravity. Optionally, the grass shredder blade 100 is symmetrical about the axis of rotation.
[0033] The lawnmower 1 also includes a base 400, with grass-chopping blades 100 disposed at the bottom of the base 400. In use, the bottom of the base 400 faces the lawn, and the lawnmower 1 can be pushed across the lawn to allow the grass-chopping blades 100 to trim different parts of the lawn.
[0034] See Figures 2 to 4The grass cutting blade 100 provided by the embodiment includes a middle part 10 and two cutting parts 20. The two cutting parts 20 are respectively arranged at two ends of the middle part 10 along a length direction X, and each cutting part 20 has a front side 20a and a back side 20b opposite to each other along a width direction Y of the middle part 10, and the front side 20a is provided with a cutting edge 21. The cutting part 20 is provided with a first protruding part 22 at one end close to the middle part 10 along the length direction X, and the first protruding part 22 is protruded from the cutting part 20 along a thickness direction Z of the middle part 10. The two side surfaces of the first protruding part 22 along the length direction X are both configured as smooth curved surfaces.
[0035] The grass cutting blade 100, the two cutting parts 20 are respectively arranged at two ends of the middle part 10 along the length direction X, and the front side 20a of each cutting part 20 is provided with the cutting edge 21. When cutting, the cutting edge 21 can cut the grass leaves by rotating the grass cutting blade 100. By arranging the first protruding part 22, the first protruding part 22 is protruded from the cutting part 20 along the thickness direction Z of the middle part 10, so that the first protruding part 22 can realize the cutting function at different positions along the thickness direction Z during the cutting process of the grass cutting blade 100, that is, the cutting can be performed at different heights of the grass leaves. In addition, since the two side surfaces of the first protruding part 22 along the length direction X are both configured as smooth curved surfaces, the airflow circulation is avoided due to the surface of the first protruding part 22 having a plane inclined at an acute angle when the grass cutting blade 100 is used. Therefore, the two side surfaces of the first protruding part 22 along the length direction X are both configured as streamlined surfaces, which reduces the wind resistance when the grass cutting blade 100 is used, further reduces the power loss caused by the wind resistance, and increases the outlet flow of the mower 1. In addition, since the two side surfaces of the first protruding part 22 along the length direction X are both configured as smooth curved surfaces, the formation of a straight angle with a large bending angle at the connection between the first protruding part 22 and other parts of the cutting part 20 is also avoided, which is beneficial to reduce the processing cost.
[0036] It can be understood that, when the grass cutting blade 100 is rotated to cut the grass leaves during use, the front side 20a of the cutting part 20 is the side facing the grass leaves.
[0037] In some embodiments, as Figure 4 and Figure 5As shown, the second protruding portion 23 is formed by the cutting portion 20 being twisted relative to the middle portion 10, and the second protruding portion 23 is formed at the portion of the cutting portion 20 close to the rear side 20b. The protruding direction of the second protruding portion 23 is the same as the protruding direction of the first protruding portion 22, i.e., toward the same side of the middle portion 10 along the thickness direction Z. In this way, by providing the second protruding portion 23, the portion of the cutting portion 20 away from the middle portion 10 and close to the front side 20a is lower than the second protruding portion 23, so that after the grass leaves cut by the cutting edge 21 away from the middle portion 10 are cut off, the cut-off grass leaves are long and flow along the width direction Y toward the second protruding portion 23 together with the airflow, and flow upward through the second protruding portion 23, and when the grass leaves touch the bottom shell 400 (see Figure 1 ) of the lawn mower 1, the grass leaves change direction and flow downward, at which time the cutting portion 20 at the other end of the middle portion 10 rotates to cut the grass leaves again, and the grass leaves rise again together with the airflow. Through the above cycle, the grass leaves can be cut into small pieces.
[0038] Because the portion of the cutting portion 20 away from the middle portion 10 and close to the front side 20a is lower than the second protruding portion 23, the air flows upward when moving from the front side 20a to the rear side 20b, and because the portion of the cutting portion 20 close to the middle portion 10 and close to the rear side 20b is lower than the first protruding portion 22, the air flows downward when moving from the front side 20a to the rear side 20b, so that a high-pressure area is formed at the upper portion of the second protruding portion 23 close to the rear side 20b, and a low-pressure area is formed at the upper portion of the portion of the cutting portion 20 close to the middle portion 10 and close to the rear side 20b, so that the airflow can also flow along the length direction X toward the side close to the middle portion 10, so that the long grass leaves cut by the cutting edge 21 away from the middle portion 10 flow toward the side close to the middle portion 10 according to the direction of the airflow to be cut again.
[0039] In some embodiments, as shown in Figure 4 , along the width direction Y, the portion of the first protruding portion 22 close to the front side 20a is higher than the portion of the first protruding portion 22 close to the rear side 20b, to form a first curved surface 221 extending downward from the front side 20a to the rear side 20b. Along the width direction Y, the portion of the second protruding portion 23 close to the front side 20a is lower than the portion of the second protruding portion 23 close to the rear side 20b, to form a second curved surface 231 extending upward from the front side 20a to the rear side 20b. In this way, it is further beneficial to make the airflow flow from the side of the cutting portion 20 away from the middle portion 10 toward the side of the cutting portion 20 close to the middle portion 10, so as to further improve the grass cutting effect.
[0040] In some embodiments, the connection between the middle portion 10, the first curved surface 221, and the second curved surface 231 is constructed as a continuous smooth curved surface in the length direction X, so as to further reduce the wind resistance when the grass shredder 100 is used, thereby further reducing power loss and reducing processing costs.
[0041] In some embodiments, such as Figure 4 As shown, the highest point of the first protrusion 22 in the thickness direction Z is located on the front side 20a, and the highest point of the second protrusion 23 in the thickness direction Z is located on the rear side 20b. The highest point of the second protrusion 23 in the thickness direction Z is lower than the highest point of the first protrusion 22 in the thickness direction Z. Thus, by setting the highest point of the second protrusion 23 in the thickness direction Z to be located on the rear side 20b, the airflow can flow from the front side 20a away from the middle part 10 of the cutting part 20 along the width direction Y to the rear side 20b. This facilitates the grass blades to rise with the airflow and fall after touching the bottom shell 400 of the lawnmower 1, so that they can be cut into fragments by the cutting edge 21 at the other end of the middle part 10, thereby further improving the grass shredding effect. Furthermore, the highest point of the first protrusion 22 in the thickness direction Z is located at the rear side 20b, which is conducive to forming a high-pressure zone away from the middle part 10 and a low-pressure zone near the middle part 10 in the part of the cutting part 20 near the rear side 20b. This facilitates the flow of grass blades cut from the end of the cutting edge 21 away from the middle part 10 along the length direction X, and secondary cutting is performed from the end of the cutting edge 21 near the middle part 10.
[0042] In some embodiments, combined with Figure 2 and Figure 4 As shown, the cutting edge 21 is located in front of the first protrusion 22 and the second protrusion 23 and is configured to first slope upward from the end of the middle part 10 to form the highest point of the first protrusion 22 and then slope downward to form the lowest point of the second protrusion 23, so that the cutting edge 21 can cut at different heights of the grass blade.
[0043] In some embodiments, such as Figure 4 As shown, the highest point of the first protrusion 22 in the thickness direction Z is close to the middle of the first protrusion 22 in the length direction X, so that the cutting edge 21 gradually rises from one end near the middle portion 10 to the other end along the length direction X, reaching the highest point of the first protrusion 22 in the thickness direction Z, and then gradually decreases, making the cutting edge 21 arched, which further facilitates cutting at different heights. Optionally, the highest point of the first protrusion 22 in the thickness direction Z is higher than the middle portion 10, and the portion of the cutting edge 21 on the side of the first protrusion 22 away from the middle portion 10 is lower than the middle portion 10 in the thickness direction Z. In this embodiment, the height difference between the first protrusion 22 and the middle portion 10 in the thickness direction Z is 4.7 mm.
[0044] In some embodiments, as shown in FIG. 1, the cutting part 20 is provided with a first protruding part 22 and a second protruding part 23. Figure 4 As shown in FIG. 1, along the length direction X, the second protruding part 23 extends to the side close to the middle part 10 to be opposite to the first protruding part 22 in the width direction Y, which facilitates the transition of the second protruding part 23 and the first protruding part 22.
[0045] In some embodiments, along the length direction X, the curvature of the cutting part 20 is greater than or equal to 0 degree and less than or equal to 220 degrees.
[0046] In some embodiments, along the width direction Y, the curvature of the cutting part 20 is greater than or equal to 30 degrees and less than or equal to 172 degrees.
[0047] The grass cutting blade 100 provided by the present embodiment has no plane with acute angle inclination, which facilitates the airflow circulation, thereby reducing the power loss caused by wind resistance and reducing the processing cost of the grass cutting blade 100. When the grass cutting blade 100 is used, the grass leaves can flow up and down along the thickness direction Z and flow along the length direction X to the middle part 10, so that the cut grass leaves can be cut multiple times, improving the crushing effect of the grass leaves. After the grass leaves are crushed into grass clippings, they are scattered on the lawn, which does not affect the quality of the lawn while increasing the nutrients of the lawn.
[0048] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application.
Claims
1. A grass chopper blade for mounting on a grass cutter, characterised in that, The grass cutting blade comprises: a middle part and cutting parts at both ends, the cutting parts having front and back sides opposite along a width direction of the middle part, the front side being provided with a cutting edge; wherein the cutting part at one end close to the middle part along a length direction is provided with a first protruding part, the first protruding part being protruded by the cutting part along a thickness direction of the middle part; the opposite sides of the first protruding part along the length direction are configured as continuous smooth curves.
2. The grass chopper blade of claim 1, wherein, the cutting part at one end away from the middle part is provided with a second protruding part, the second protruding part being twisted by the cutting part relative to the first protruding part; the twisting direction of the second protruding part and the protruding direction of the first protruding part are towards the same side of the thickness direction of the middle part.
3. The grass chopper blade of claim 2, wherein, along the width direction, the part of the first protruding part close to the front side is higher than the part of the first protruding part close to the back side, to form a first curve extending downward from the front side to the back side; along the width direction, the part of the second protruding part close to the front side is lower than the part of the second protruding part close to the back side, to form a second curve extending upward from the front side to the back side.
4. The grass chopper blade of claim 3, wherein, the connection between the middle part, the first curve and the second curve is configured as a continuous smooth curve along the length direction.
5. The grass chopper blade of claim 2, wherein, the first protruding part includes a highest point at the front side along the thickness direction; the second protruding part includes a highest point at the back side and a lowest point at the front side along the thickness direction; the highest point of the second protruding part along the thickness direction is lower than the highest point of the first protruding part along the thickness direction.
6. The grass chopper blade of claim 5, wherein, the cutting edge is located at the front side of the first protruding part and the second protruding part and is configured to first incline upward from the end of the middle part to form the highest point of the first protruding part and then incline downward to form the lowest point of the second protruding part.
7. The grass chopper blade of claim 5, wherein, along the length direction, the highest point of the first protruding part along the thickness direction is close to the middle of the first protruding part along the length direction.
8. The grass chopper blade of claim 1, wherein, along the length direction, the bending curvature of the cutting part is greater than or equal to 0 degree and less than or equal to 220 degree; and / or, along the width direction, the bending curvature of the cutting part is greater than or equal to 30 degree and less than or equal to 172 degree.
9. A lawnmower characterised in that a grass cutting device comprising a bottom shell, a driving mechanism mounted in the bottom shell and a grass cutting blade as claimed in any one of claims 1 to 8, the driving mechanism having a driving shaft driving the grass cutting blade to rotate.
10. The lawnmower as claimed in claim 9, characterized in that the middle part is connected to the driving shaft, so that the grass cutting blade rotates around a rotation axis parallel to the thickness direction.