Two-dimensional blade of mower

Abstract

The utility model discloses a two-dimensional blade of a mowing machine, which comprises a main blade capable of being arranged on a rotating shaft of the mowing machine, and further comprises auxiliary blades, the auxiliary blades comprise auxiliary blades I, at least one auxiliary blade I which is vertically arranged is arranged on an axial inner plate surface of the main blade, and a cutting edge is arranged at the end part of the outer side end of the blade surface of each auxiliary blade I. A vertical auxiliary blade I is installed on a plane main blade, a cutting edge is arranged on the end portion of the outer side end of the blade face of the auxiliary blade I, and along with rotation of the main blade, vines wound around a center rotating shaft are cut off, and automatic cleaning is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to a two-dimensional blade for lawn mowers. Background Art

[0002] During mechanical weeding production, it was found that the tissue fibers of vines and long-leafed grass weeds are extremely tough and cannot be completely removed by traditional flat blades. They can also easily get entangled in the shaft of the lawn mower, causing transmission jams. At this time, the lawn mower must be stopped and the weeds entangled in the shaft must be manually cleaned before the operation can continue. Moreover, the cleaning process is time-consuming and labor-intensive, and the weeds are easily scratched by the blades, which greatly affects the efficiency of mowing. Utility Model Content

[0003] The invention of the utility model aims to solve the above problems and provide a two-dimensional blade for a lawn mower, which can cut off the vines that are entangled with the central rotating shaft and realize automatic cleaning.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0005] A two-dimensional blade for a lawn mower comprises a main blade that can be installed on a rotating shaft of the lawn mower, and also comprises an auxiliary blade, wherein the auxiliary blade comprises an auxiliary blade I, at least one upright auxiliary blade I is arranged on the axial inner plate surface of the main blade, and a blade edge is provided at the outer end of the blade surface of the auxiliary blade I.

[0006] As mentioned above, an upright auxiliary blade 1 is installed on the plane main blade, and a blade is provided at the outer end of the blade surface of the auxiliary blade 1. As the main blade rotates, the vines that are wrapped around the central rotation axis are cut off to achieve automatic cleaning.

[0007] Based on the above scheme, in an improved scheme, the cutting edge of the secondary blade I intersects with the tangent direction of its rotation trajectory to form a cutting angle a1, wherein the cutting angle a1 is an acute angle. Preferably, the cutting angle a1 is greater than or equal to 30° and less than or equal to 50°, such as 35°, 40° or 45°. In this way, the cutting angle is naturally formed by the opening direction of the blade and the circumferential direction of the rotation, and the winding vines on it are cut with better cutting effect and less effort.

[0008] Based on the above scheme, in an improved scheme, the auxiliary blade also includes an auxiliary blade II, and at least one upright auxiliary blade II is arranged on the axial outer plate surface of the main blade, and a blade is provided at the outer end of the blade surface of the auxiliary blade II. Preferably, the blade edge of the auxiliary blade II intersects with the tangent direction of its rotation trajectory to form a cutting angle a3, wherein the cutting angle a3 is an acute angle. Preferably, the cutting angle a3 is greater than or equal to 30° and less than or equal to 50°. An auxiliary blade structure is also arranged on the end cover side to cut off the vines that are wrapped around the end cover fixed to the rotating shaft to achieve automatic cleaning, and the natural cutting angle between the blade opening direction and the circumferential direction of rotation is utilized to cut the wrapped vines thereon, with better and more labor-saving cutting effect.

[0009] Based on the above scheme, in an improved scheme, the outer end of the blade surface of the auxiliary blade I and the inner end of the blade surface are arranged in the same circle with the rotating hole as the center, wherein the inner end of the blade surface of the auxiliary blade I is provided with a blade; and / or, the outer end of the blade surface of the auxiliary blade II and the inner end of the blade surface are arranged in the same circle with the rotating hole as the center, wherein the inner end of the blade surface of the auxiliary blade I is provided with a blade. Among them, the rotating front side edge and the rotating rear side edge of the cutting part of the main blade are both sharpened; at this time, in one example, only the inner end of the blade surface of the auxiliary blade I is provided with a blade; in another example, only the inner end of the blade surface of the auxiliary blade II is provided with a blade; in another example, the inner ends of the blade surfaces of the auxiliary blade I and the two auxiliary blades II are all provided with blades. In this way, it can be cut forward and backward with the motor, or the main blade can be turned over for cutting, and the board surface can be turned over to change the cutting part operation as needed; at this time, the auxiliary blade I and / or the auxiliary blade II can cut off the winding vines to achieve automatic cleaning. Preferably, the auxiliary blade II and the auxiliary blade I have the same structure, so that when the board is flipped over to replace the cutting part, it can be ensured that the vines wrapped around the rotating shaft side are fully cut off.

[0010] Based on the above scheme, in an improved scheme, the main blade is equipped with two cutting parts, and the two cutting parts of the main blade are symmetrically arranged about its normal plane; and the two auxiliary blades I are symmetrically arranged about the normal plane, and / or the two auxiliary blades II are symmetrically arranged about the normal plane. In one example, only two auxiliary blades I are arranged; in another example, only two auxiliary blades II are arranged; in another example, two auxiliary blades I and two auxiliary blades II are arranged at the same time. In this way, it is easy to coordinate the distribution of blade weights to prevent eccentric rotation caused by uneven distribution, so as to solve the dynamic balance problem.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0012] 1. The utility model is a two-dimensional blade for a lawn mower. An upright auxiliary blade I is installed on a plane main blade. A blade is provided at the outer end of the blade surface of the auxiliary blade I to enable sharp cutting. As the main blade rotates, vines that are entangled with the central rotating axis are cut off, thereby blocking various factors that cause stalling and achieving automatic cleaning.

[0013] 2. Take advantage of the natural cutting angle between the opening direction of the blade and the rotating circular direction to cut the winding vines on it, with better cutting effect and less effort.

[0014] 3. The auxiliary blade has a bidirectional blade, which can cut in the forward and reverse directions with the motor, or flip the main blade to cut; in addition, the auxiliary blade structure is also arranged on the end cover side, and the main blade plate can be flipped as needed to change its cutting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a two-dimensional blade example 1 of the utility model; Figure 2 is a schematic diagram of the structure of the main blade of Example 1; Figure 3 yes Figure 2 A top view of Figure 4 yes Figure 2 Schematic diagram of the cross section at the secondary tool hole; Figure 5 is a schematic structural diagram of the auxiliary blade 1 of Example 1; Figure 6 yes Figure 5 The main view of Figure 7 yes Figure 5 Side view of Figure 8 It is a schematic diagram of the arrangement of the auxiliary blade I of Example 1.

[0016] Fig. 9 It is a schematic diagram of the arrangement of the auxiliary blade 1 of the two-dimensional blade example 2 of the utility model.

[0017] Fig.10 It is a schematic diagram of the arrangement of the auxiliary blade 1 of the two-dimensional blade example 3 of the utility model.

[0018] Fig.11 It is a front view of the auxiliary blade 1 of the two-dimensional blade example 4 of the utility model.

[0019] Fig.12 It is a schematic structural diagram of a two-dimensional blade example 5 of the utility model; Fig.13 is a schematic diagram of the structure of the main blade of Example 5; Fig.14 yes Fig.13 A top view of Fig.15 It is a schematic diagram of the arrangement of the auxiliary blade I of Example 5.

[0020] Fig.16 It is a schematic structural diagram of a two-dimensional blade example 6 of the utility model; Fig.17 It is a top view of the main blade of Example 6.

[0021] Fig.18 It is a schematic structural diagram of a two-dimensional blade example 7 of the utility model; Fig.19 is a schematic diagram of the structure of the auxiliary blade of Example 7; Fig. 20 yes Fig.19 The main view of Fig.21 yes Fig.19 Side view of.

[0022] Fig. 22 This is a schematic diagram of the main blade structure of the two-dimensional blade example 8 of the utility model; Fig.23 yes Fig. 22 A top view of Fig.24 yes Fig. 22 Schematic diagram of the cross section at the secondary tool hole.

[0023] Fig.25 It is a top view of the main blade of the two-dimensional blade example 9 of the utility model.

[0024] In the accompanying drawings, 1. main blade, 11. rotating hole, 12. auxiliary blade hole, 13. cutting part, 2. auxiliary blade I, 21. support, 221. outer end portion, 222. inner end portion, 223. transition section, 3. auxiliary blade II. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 2 As shown, the central axis of the rotating hole is defined as the axial direction, the circumferential plane of the rotating hole is defined as the circumferential plane, and the plane perpendicular to the circumferential plane and passing through the central axis is defined as the normal plane.

[0027] See also Figure 1-Figure 10 A two-dimensional blade for a lawn mower in this embodiment 1 includes a main blade 1 that can be installed on a rotating shaft of the lawn mower, and also includes an auxiliary blade, the auxiliary blade includes an auxiliary blade I 2, and at least one upright auxiliary blade I 2 is provided on the axial inner plate surface of the main blade 1 (the plate surface located on the axial inner side of the rotating hole), which protrudes from the main blade plate surface by a certain height, and an outer end portion 221 of the blade surface of the auxiliary blade I2 (its position is at the end portion on the outer side of the circumferential surface of the rotating hole) is provided with a blade, and a transition section 223 is provided.

[0028] As shown in the figure, this embodiment 1 is described by taking two cutting parts and one auxiliary blade I as an example, wherein the two cutting parts 13 of the main blade are symmetrically arranged about its normal surface k1, and the cutting edge of the cutting part narrows from the inside to the outside in an arc curve, presenting a gradually descending wavy line. The blade surface (plate surface) of the auxiliary blade I is in a circular arc shape, an elliptical arc shape, a parabolic arc shape, a triangle, a trapezoid or a rectangular structure. Figure 5-Figure 7 The blade face of the example 1 secondary blade I is an elliptical arc shape. Fig.11The blade surface of the illustrated example 4 secondary blade 1"2" is an isosceles trapezoidal shape, and its outer end portion "221" is provided with a blade.

[0029] The auxiliary blade I needs to protrude a certain height from the main blade surface to completely cut off all vines wrapped around the central rotation axis. When arranged upright, it can be slightly tilted or arranged vertically. Considering the cutting force, etc., it is preferred to arrange the auxiliary blade I perpendicular to the main blade surface.

[0030] When the auxiliary blade I is arranged, the direction of the blade edge at the outer end of the blade surface (the plane direction of the plane blade) can intersect, be perpendicular to or coincide with the tangent direction of its rotation trajectory. The direction of the blade edge of the auxiliary blade I intersects with the tangent direction of its rotation trajectory to form a cutting angle a1. Both the main blade and the auxiliary blade I adopt a thin sheet structure. The main blade rotates at a high speed to drive the auxiliary blade I to rotate, and the side edge of the blade can hit the small tender vines and gradually cut them off.

[0031] like Figure 8 In the example 1 shown, the blade edge of the blade surface of the auxiliary blade I intersects with its rotation trajectory p1 at an acute angle, and the following conditions occur when the acute angles intersect. When the blade surface of the auxiliary blade I with a certain blade width w and its inner end (its position is at the inner end of the circumferential surface of the rotating hole) are in the same rotation trajectory (i.e., arranged in the same circle), the cutting angle value is a0, at which time its rotation front side edge (front side edge) and its rotation rear side edge (rear side edge) can both cut and scrape the vines. The front side edge is the blade surface outer end, and the blade surface outer end is sharpened, which is sharper than when it is not sharpened and improves the cutting effect, thereby quickly cutting the vines. Between a0 and 90°, the rotation trajectory diameter of its rotation front side edge (front side edge) is larger, and the front side edge is the blade surface outer end, and the blade surface outer end is provided with a blade to obliquely tangent the vines, which is sharper than when it is not sharpened and improves the cutting effect, thereby quickly cutting the vines. Between 0° and a0, the diameter of the rear edge rotation trajectory is larger. The rear edge is the outer end of the blade. The outer end of the blade is provided with a blade to scrape the vines. Compared with the unsharpened state, it is sharper and has a better cutting effect, thereby gradually cutting off the vines.

[0032] like Fig. 9 In the example 2 shown, the blade edge of the outer end of the blade surface of the auxiliary blade I is oriented to intersect perpendicularly with its rotation trajectory p2. At this time, the cutting angle a1 is 90°. When vertical, the diameter of the rotation trajectory of the outer end of the blade surface is larger. The blade edge is provided at the outer end of the blade surface to vertically scrape the vines, which is sharper than when it is not sharpened and improves the cutting effect, thereby gradually cutting off the vines.

[0033] like Fig.10In the example 3 shown, the edge of the blade at the outer end of the blade surface of the auxiliary blade I intersects with its rotation trajectory p3 at an obtuse angle. When the obtuse angle intersects, the diameter of the rotation trajectory of the outer end of the blade surface is larger. The blade at the outer end of the blade surface is provided with a blade to scrape the vines obliquely, which improves the cutting effect compared to its unsharpened state, thereby gradually cutting off the vines.

[0034] In another example, the blade surface of the front side edge of the auxiliary blade I is tangent to its rotation trajectory. At this time, a1 is 0°, and the blade surface of the auxiliary blade I has a certain width w. Therefore, when overlapping, the diameter of the rotation trajectory of the rear side edge is larger. The rear side edge is the outer end of the blade surface. The outer end of the blade surface is sharpened to scrape the vines, which is sharper than when it is not sharpened and improves the cutting effect, thereby gradually cutting off the vines.

[0035] The auxiliary blade 1 is made of the same material as the main blade, and its blade surface thickness is 2-5mm. It can be integrally molded and cast with the main blade, or the auxiliary blade 1 can be welded on the main blade, which are all existing technologies. This embodiment 1 takes welding as an example for explanation. As shown in the figure, in order to improve the welding fixing effect, an auxiliary blade hole 12 is firstly opened on the main blade 1, and then the support 21 of the auxiliary blade 1 is placed in the auxiliary blade hole, and then welded and fixed.

[0036] As mentioned above, the main blade is installed on the rotating shaft of the lawn mower through the rotating hole 11. As the main blade rotates, the rear edge and / or front edge of the auxiliary blade 1 cuts off the vines that are wrapped around the central rotating shaft, thereby achieving automatic cleaning; moreover, in the current installation rotation and steering state, the rotation trajectory of the front edge (front edge blade edge) of the auxiliary blade 1 is greater than or equal to the rear edge, and the side edge (front edge) of the auxiliary blade 1 on the side in front of the rotation is provided with a blade, so that it can cut sharply and cut better.

[0037] Example 2

[0038] On the basis of Example 1, this Example 2 preferably performs cutting at an angle, and for details not explained, please refer to the previous examples.

[0039] See also Figure 1-Figure 8 As mentioned above, in the blade of the present embodiment 2, the cutting edge of the auxiliary blade I intersects with the tangent direction of its rotation trajectory to form a cutting angle a1, wherein the cutting angle a1 is an acute angle.

[0040] Based on the above examples, in a preferred example, considering a better cutting effect, preferably, the cutting angle a1 is greater than or equal to 30° and less than or equal to 50°, such as 35°, 40° or 45°.

[0041] Based on the foregoing example, in another preferred example, the balance between motor power and cutting effect is considered. If the motor power is insufficient and the cutting is too deep, it may be caught by vines and cause obstruction, resulting in downtime for maintenance. Therefore, it is preferred to limit the outer end of the blade surface of the auxiliary blade I and the inner end of the blade surface to be arranged in the same circle with the rotating hole (the central axis of the rotating hole) as the center, and then determine the value of the cutting angle a1 according to the value of the width w of the auxiliary blade I. a1 may be 5°, 10°, 20°, 35°, etc.

[0042] In this way, the naturally formed cutting angle between the opening direction of the blade and the rotating circular direction can be used to cut the winding vines on it, with better cutting effect and less effort.

[0043] Example 3

[0044] The difference between this embodiment 3 and the aforementioned embodiment 1 or embodiment 2 is that two auxiliary blades 1 are used. For details not explained in detail, please refer to the aforementioned embodiments.

[0045] See also Figure 12-Figure 15 The main blade is equipped with two cutting parts, and the two auxiliary blades I are arranged symmetrically about the normal plane, so that it is easy to coordinate the weight distribution of the entire blade to prevent eccentric rotation caused by uneven distribution, so as to solve the dynamic balance problem.

[0046] Example 4

[0047] On the basis of Example 1 or Example 2 and Example 3, this Example 4 has a cutting structure of the side plate surface (plate surface on the axial outside of the rotating hole) of the main blade end cover. For details not fully explained, please refer to the aforementioned embodiments.

[0048] See also Figure 16-17 In the blade of the present embodiment 4, the auxiliary blade also includes an auxiliary blade II 3. At least one upright auxiliary blade II 3 is provided on the axial outer plate surface of the main blade 1, and a cutting edge is provided at the outer end of the blade surface of the auxiliary blade II 3.

[0049] The shape design of the auxiliary blade II refers to the auxiliary blade I described above and below, and its length dimension parameters can be the same as the auxiliary blade I or designed according to the different working conditions on both sides, and its installation position and connection structure can be the same as the auxiliary blade I or designed according to the different working conditions on both sides. This application takes an auxiliary blade II with the same structure as the auxiliary blade I as an example, and arranges the position and connection relationship of the auxiliary blade II with reference to the outer end position, connection and cutting angle a1 of the blade face of the auxiliary blade I, and opens an auxiliary blade hole '12' on the main blade to weld the auxiliary blade II 3.

[0050] In this way, a secondary blade structure is also arranged on the end cover side to cut off the vines that are entangled with the end cover fixed to the rotating shaft, thereby achieving automatic cleaning.

[0051] Based on the above examples, in a preferred embodiment, the direction of the blade edge of the secondary blade II intersects with the tangent direction of its rotation trajectory to form a cutting angle a3, wherein the cutting angle a3 is an acute angle. Preferably, the cutting angle a3 is greater than or equal to 30° and less than or equal to 50°, such as 35°, 40° or 45°. In this way, the natural cutting angle between the blade opening direction and the rotation circumferential direction is utilized to cut the winding vines on it, and the cutting effect is better and more labor-saving.

[0052] Based on the above example, in another preferred example, considering the balance between motor power and cutting effect, it is preferred to limit the outer end of the blade surface of auxiliary blade II and the inner end of the blade surface to be arranged in the same circle with the rotary hole (the center axis of the rotary hole) as the center, and then determine the value of a3 according to the width of the blade surface of auxiliary blade II. a3 may be 5°, 10°, 20°, 35°, etc.

[0053] Example 5

[0054] On the basis of any one of Embodiments 1 to 4, this Embodiment 5 has a structure for sharp cutting on both sides. For details not fully explained, please refer to the aforementioned embodiments.

[0055] See also Figure 1-Figure 10 and Figure 12-Figure 17 The blade of this embodiment 5 is designed to have a sharp edge on the inner end of the blade face of the secondary blade.

[0056] In Examples 1 to 3 and 5, a cutting edge is provided at the inner end portion (rear edge) of the blade face of the auxiliary blade 1.

[0057] In Example 6, cutting edges are provided at the inner ends (rear edges) of the blade surfaces of the auxiliary blades I and II.

[0058] Among them, referring to the outer end of the blade face and the cutting edge arrangement of the auxiliary blade I mentioned above, the cutting effect can be given priority, or the balance between the motor power and the cutting effect can be given priority, and then the inner end of the blade face of the auxiliary blade I and its cutting angle a2 are arranged. Similarly, the inner end of the blade face of the auxiliary blade II and its cutting angle a4 are arranged.

[0059] Of course, in order to realize the mowing operation by using the main blade in both directions, the rotation front side edge and the rotation rear side edge of the cutting portion of the main blade are both sharpened.

[0060] In this way, the main blade and its upper auxiliary blade can both perform sharp cutting operations by cutting in both directions with the motor. Alternatively, in the example of arranging auxiliary blades I and II, the main blade can be turned over to cut the vines wrapped around the central rotating axis, so the board surface can be turned over to change the cutting part as needed.

[0061] Based on the above examples, in a preferred embodiment, the auxiliary blade II and the auxiliary blade I have the same structure, that is, they have the same shape and size. In this way, it is easy to manufacture and assemble; moreover, the required vertical length of the blade on the end cover side (axially outer side) is smaller than that on the rotating shaft side (axially inner side), and the auxiliary blade I is used for assembly, so that when the board surface is turned over to replace the cutting part, the vines wrapped around the rotating shaft side can be fully cut off.

[0062] Example 6

[0063] On the basis of any one of Embodiments 1 to 5, the present Embodiment 6 preferably has a secondary blade face structure. For details not fully explained, please refer to the aforementioned embodiments.

[0064] According to the difficulty of cutting vines, the edges on both sides of the auxiliary blade can be adjusted to be a vertical design or an inclined design, or the inclination angle of the bottom can be adjusted.

[0065] For example, the auxiliary blade I is in the shape of a right-angled trapezoid, with its side edge I at a 90° angle to the main blade surface, and side edge II at a 70° angle. Its lower base is welded to the main blade, and the blade edges at the lower base are arranged in the same direction. At this time, for situations where thick and old vines are difficult to cut, if the side edge I blade is used, the force applied during cutting may cause bending or jamming; on the contrary, the side edge II blade is used, because it has a larger inclination angle (relative to the angle of side edge I) as it shrinks away from the main blade, so that the vine can slide down more easily with the inclination of side edge II, which has a better unloading effect, and the force applied is relatively small, reducing the risk of bending or jamming.

[0066] For example, Fig.11 In the example 4 shown, the blade surface of the auxiliary blade I is an isosceles trapezoid with a lower base inner angle of 60°. When other features are the same, the force conditions on its two side edges are basically the same.

[0067] For example, Figure 1-Figure 8 In the example 1 shown, the blade surface of the auxiliary blade I is in a semi-elliptical arc shape, and its side edge narrows in a curve from the bottom to the top. Compared with a straight line, it has a longer side length, that is, its blade side length is longer, so that the cutting effect is better while ensuring better force unloading.

[0068] Therefore, the blade surface structure of the auxiliary blades I and II preferably adopts a design in which the side edges are curved and narrowed, for example, a semicircular arc shape, a semi-elliptical arc shape or a parabolic arc shape.

[0069] Example 7

[0070] On the basis of any one of Embodiments 1 to 6, this Embodiment 7 preferably limits the number and distribution structure of the auxiliary blades. For details not fully explained, please refer to the aforementioned embodiments.

[0071] See also Figure 18-Figure 21In the present embodiment 7, the blade has two cutting parts, two auxiliary blades I, or two auxiliary blades I and II.

[0072] Among them, the two auxiliary blades I and II can be arranged in two symmetrically arranged cutting parts. Or, the two auxiliary blades I are arranged in two symmetrically arranged cutting parts. Or, the two auxiliary blades I and the auxiliary blade II are distributed in a ring array, and the two auxiliary blades I are arranged in two cutting parts; etc. As shown in the figure, on a similar main blade, the auxiliary blade is arranged in the cutting part, the cutting part extends a certain length, the radius is larger, and the auxiliary blade welding point selection range is wider.

[0073] On the other hand, the auxiliary blades I and II can be arranged at the same position at the same time, or arranged at limited positions respectively, taking into account the opening of auxiliary blade holes and welding operations, such as Figure 18-Figure 21 The example 7 shown is described as preferably using the auxiliary blade I'2' and the auxiliary blade II'3', and the support '21' (for the above distinction, they are defined as the auxiliary blade I' and the auxiliary blade II', and the support ') integrated and arranged at the same position.

[0074] like Figure 18-Figure 21 As shown, the two cutting parts of the main blade are symmetrically arranged about its normal surface k1, and the two auxiliary blades I are symmetrically arranged about the normal surface k1, and the two auxiliary blades II are symmetrically arranged about the normal surface k1. Specifically, two auxiliary blade holes are opened on the main blade, and then the support '21' is placed in the auxiliary blade hole, and then the auxiliary blade I'2' and the auxiliary blade II'3' are fixed by welding.

[0075] In this way, it is easy to coordinate the distribution of blade weight and prevent eccentric rotation caused by uneven distribution, so as to solve the dynamic balance problem and avoid the shaking of the lawn mower. At the same time, the auxiliary blades I and II are designed as an integrated unit, and a pair of blade holes are opened for installation, which is convenient for assembling the auxiliary blades and has better connection stability.

[0076] Example 8

[0077] The difference between this embodiment 8 and the aforementioned embodiments 1 to 7 lies in the main blade structure. For any details not fully explained, please refer to the aforementioned embodiments.

[0078] See also Figure 22-Figure 24 Example 8 shows another example of the main blade face structure. For the purpose of distinguishing and explaining, it is defined as the main blade '1'. The cutting edge of the main blade '1' narrows from the inside to the outside in an elliptical arc shape. Other similar structures narrow in a circular arc or parabola shape. In addition, the main blade '1' adopts a different edge structure from the main blade 1.

[0079] Example 9

[0080] The difference between this embodiment 9 and the aforementioned embodiments 1 to 8 lies in the main blade structure. For details not fully explained, please refer to the aforementioned embodiments.

[0081] See also Fig.25 The example 9 shown shows another example of the main blade face structure. The main blade "1" is rectangular, and its cutting edge does not narrow from the inside to the outside. Compared with the two main blade structures mentioned above, the main blade "1" of this embodiment 9 is not designed with a narrowing structure for the external sliding unloading force. When the motor power is not sufficient, it is easier to get stuck in hard and old vines that are difficult to cut, causing obstructions and requiring shutdown for maintenance.

[0082] As in the above-mentioned embodiments 1 to 9, the blade of the present application is to install two symmetrical upright auxiliary blades on the plane main blade, and the upright blades are sharpened in two directions. The vines that are wrapped around the central axis are cut off by using the natural cutting angle between the blade opening direction and the rotation axis direction, thereby blocking various factors that cause the rotation to be blocked and automatically cleaning. The main blade is sharpened in four directions symmetrically, and the same effect can be achieved in both forward and reverse rotations, and one blade can replace two blades.

[0083] It is specifically used in general-purpose back-type oil-powered lawn mowers. Its interface: the rotating shaft flange interface (rotating hole) is 25.4mm (universal standard). Cutting direction: the thickness of the main blade and the auxiliary blade is 1-5mm, such as 2mm or 3mm; the vertical length of the blade of the integrated auxiliary blade is 25-35mm, such as 30mm; the blade width w of the integrated auxiliary blade is 10-20mm, such as 15mm. Control process: 1. Installation preparation: Remove the lawn mower blade fixing screws and flange, align the rotating shaft slot to install the upper blade, tighten the flange and screws, and replace the operation side in reverse order. 2. Efficiency check: After a certain period of operation, check the sharpness of the blade edge and install the blade 180 degrees. You can also grind the edge as appropriate to maintain the cutting effect.

[0084] Two symmetrical upright small blades are installed on the traditional flat blade of the lawn mower to cut off the vines that are entangled with the central axis, achieving an automatic cleaning effect and effectively avoiding the problem of transmission shaft blocking. It has the following advantages:

[0085] 1. It can be realized by simply replacing the main blade without modifying other structures. It is easy to install, safe and reliable.

[0086] 2. Extend the lifespan, one piece is equivalent to two pieces.

[0087] 3. Automatic cleaning, saving time and worry.

[0088] 4. Power fuel economy and operating efficiency are improved.

[0089] As mentioned above, this blade is used in actual operating scenarios where high efficiency is required. For example, in weeding farmland and forest fire rescue, in a complex perennial weed environment, it is necessary to race against time to quickly establish firebreaks to prevent the fire from spreading and causing greater harm. Efficient tools are particularly important.

[0090] It should be pointed out that the examples of the above-mentioned embodiments can be preferably combined with one or more of them according to actual needs, and multiple examples use a set of drawings to illustrate the combined technical features, which will not be described one by one here.

[0091] It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0092] The above description is a detailed description and illustration of the preferred feasible embodiments of the utility model, but these descriptions are not intended to limit the scope of protection required by the utility model. All equivalent changes or modified changes completed under the technical teachings suggested by the utility model should fall within the scope of patent protection covered by the utility model.

Claims

1. A two-dimensional blade for a lawn mower, comprising a main blade provided with a rotating hole so as to be mounted on a rotating shaft of the lawn mower, characterized in that: It also includes an auxiliary blade, which includes an auxiliary blade I. At least one upright auxiliary blade I is arranged on the axial inner plate surface of the main blade, and a blade edge is provided at the outer end of the blade surface of the auxiliary blade I.

2. A two-dimensional blade for a lawn mower according to claim 1, characterized in that: The cutting edge of the auxiliary blade I intersects with the tangent direction of its rotation trajectory to form a cutting angle a1, wherein the cutting angle a1 is an acute angle.

3. A two-dimensional blade for a lawn mower according to claim 2, characterized in that: The cutting angle a1 is greater than or equal to 30° and less than or equal to 50°; the thickness of the auxiliary blade I is 2-5 mm.

4. The two-dimensional blade for a lawn mower according to claim 1, characterized in that: The auxiliary blade also includes an auxiliary blade II. At least one auxiliary blade II is arranged upright on the axial outer plate surface of the main blade, and a blade is formed at the outer end of the blade surface of the auxiliary blade II. The auxiliary blade I and the auxiliary blade II are respectively arranged vertically on the main blade.

5. A two-dimensional blade for a lawn mower according to claim 4, characterized in that: The cutting edge of the auxiliary blade II intersects with the tangent direction of its rotation trajectory to form a cutting angle a3, wherein the cutting angle a3 is an acute angle.

6. A two-dimensional blade for a lawn mower according to claim 5, characterized in that: The cutting angle a3 is greater than or equal to 30° and less than or equal to 50°; the thickness of the auxiliary blade I is 2-5 mm.

7. The two-dimensional blade for a lawn mower according to claim 4, characterized in that: The outer end portion of the blade surface of the auxiliary blade I and the inner end portion of the blade surface are arranged in the same circle with the rotating hole as the center, wherein the inner end portion of the blade surface of the auxiliary blade I is provided with a cutting edge; and / or, the outer end portion of the blade surface of the auxiliary blade II and the inner end portion of the blade surface are arranged in the same circle with the rotating hole as the center, wherein the inner end portion of the blade surface of the auxiliary blade II is provided with a cutting edge.

8. The two-dimensional blade for a lawn mower according to claim 7, characterized in that: The rotation front side edge and the rotation rear side edge of the cutting portion of the main blade are both sharpened.

9. The two-dimensional blade for a lawn mower according to claim 7, characterized in that: The auxiliary blade II and the auxiliary blade I have the same structure.

10. The two-dimensional blade for a lawn mower according to claim 7, characterized in that: The main blade is configured with two cutting parts, and the two cutting parts of the main blade are symmetrically arranged about its normal plane; and the two auxiliary blades I are symmetrically arranged about the normal plane, and / or the two auxiliary blades II are symmetrically arranged about the normal plane.

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