CN218007057U - Grass cutter - Google Patents

Abstract

The application discloses a grass mower, which comprises a base plate, a first blade and a second blade, wherein the first blade and the second blade are suitable for relative movement; at least two supporting points arranged along the length direction of the first blade are arranged between the first blade and the second blade, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly propped; and the tail end of the first blade is lifted up to form an included angle alpha with the second blade, wherein the alpha is more than 0 degree and less than or equal to 10 degrees. The middle end of the first blade is limited by the pressing of the fixing component, and the tail end of the first blade is jacked up by the supporting point, so that the blade part of the first blade can tightly abut against the blade part of the second blade, and automatic grinding is realized.

Description

Grass cutter

Technical Field

The application relates to the technical field of gardening tools, in particular to a grass cutter.

Background

The grass mower is a commonly used electric garden tool, and the rotation of a motor is controlled by a main switch of a handle, so that the reciprocating cutting motion of a blade is driven, the cutting motion of scissors is simulated, and the purpose of cutting grass or branches is achieved.

However, the blade structure inside the conventional lawnmower has the following drawbacks: after long-time use, the condition of edge curling can appear, thereby causing the reduction of grass cutting efficiency, and the blade is detached and then ground, which is also inconvenient.

Disclosure of Invention

The application aims to provide a grass cutting knife with a grinding function.

In order to achieve the above purpose, the technical scheme adopted by the application is as follows: a grass cutting knife comprises a base plate, a first blade and a second blade, wherein the first blade and the second blade are suitable for relative movement; at least two supporting points arranged along the length direction of the first blade are arranged on the bottom plate between the first blade and the second blade, the longitudinal heights of the supporting points are staggered, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly abutted; and an included angle alpha is formed between the tail end of the first blade and the second blade after the tail end of the first blade is lifted, wherein alpha is more than 0 degree and less than or equal to 10 degrees.

The same with traditional technical scheme, the first blade and the second blade of this application set up on the bottom plate side by side, and realize relative reciprocating angular motion through outside drive arrangement, thereby realize cutting grass, but different with traditional technical scheme is, be equipped with the strong point that can jack up first blade tail end on the bottom plate of this application, and the middle-end of first blade is by the spacing setting of fixed subassembly, consequently, the cutting edge portion of first blade front end can tightly support on the cutting edge portion of second blade front end, thereby when making first blade and second blade carry out relative reciprocating angular motion, the cutting edge portion of first blade can grind with the cutting edge portion of second blade each other, realize automatic grinding.

Preferably, alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

As another preference, α =3 °.

Further preferably, the first blade and the second blade are both adapted to be connected to an external driving device and swing under the driving of the external driving device, and the blade portions of the first blade and the second blade are adapted to repeatedly intersect and separate. The above structure is used to realize double-acting grass cutting.

As another optimization, both sides that are close to and keep away from cutting edge portion on the bottom plate tail end are equipped with first supporting shoe and second supporting shoe respectively, first supporting shoe with the second supporting shoe is all located first blade with for arranging in the same row between the second blade, just first supporting shoe with second supporting shoe top has one respectively the strong point.

Further preferably, the tail end of the bottom plate is provided with a guide sleeve, the first supporting block and the second supporting block are respectively arranged at two ends of the guide sleeve close to and far away from the blade part, and the first supporting block and the second supporting block are both suitable for pressing the second blade.

Further preferably, the first supporting block and the second supporting block are both arranged in a suspended manner, so that the second blade is suitable for being sleeved outside the guide sleeve and arranged below the first supporting block and the second supporting block, and the bottom ends of the first supporting block and the second supporting block are suitable for abutting against the second blade. The structure reliably ensures the limiting function of the second blade.

Further preferably, the first blade and the second blade are all sleeved outside the fixed component, the first blade and/or the second blade are provided with an opening edge on the blade part, at least one base end of the opening edge is arranged at a distance C from the fixed component, the front end of the opening edge is arranged at a distance D from the fixed component, and the ratio of the C to the D is 0.39. The structure is used for improving the grass cutting performance.

Further preferably, the fixing component and the supporting point are also arranged along the length direction of the first blade, and the fixing component is arranged in front of the supporting point; the fixing component comprises a positioning ring which is fixedly arranged, the bottom end of the positioning ring is abutted against the bottom plate, the second blade is sleeved outside the bottom end of the positioning ring, a limiting part which protrudes outwards is arranged at the top end of the positioning ring, and the bottom end of the limiting part is suitable for pressing the second blade downwards; the first blade is sleeved on the outer side of the limiting part. The structure design is simpler and more reasonable, is convenient to install and is suitable for limiting the axial movement of the second blade.

Further preferably, the fixing assembly further comprises a locking screw, a limiting nut and a gasket, a through hole is formed in the locating ring, the locking screw is suitable for penetrating through the through hole and then penetrating through the bottom plate to be connected with the limiting nut and is suitable for compressing the locating ring, the gasket is arranged between the locking screw and the locating ring, and the gasket is suitable for extending out of the limiting portion and limiting the first blade to longitudinally move and separate from the locating ring. The structure is used for limiting the movement of the positioning ring, and the gasket can reduce abrasion and limit the movement of the first blade.

Preferably, the bottom plate is fixedly provided with a limiting column, the first blade and the second blade are respectively provided with a first limiting hole and a second limiting hole, and the limiting column is suitable for penetrating through the first limiting hole and the second limiting hole and is suitable for matching with the first limiting hole and the second limiting hole to limit the rotation range of the first blade and the second blade. The above structure serves to limit the rotation range of the first blade and the second blade.

As another embodiment, the first blade is suitable for being connected with an external driving device and swinging under the driving of the external driving device; the tail end of second blade is equipped with outside bellied installation department, just the installation department is suitable for inserting in the bottom plate, thereby the realization is right the spacing setting of second blade, just first blade with the cutting edge portion of second blade is suitable for alternately repeatedly and keeps away from.

Compared with the prior art, the beneficial effect of this application lies in:

the technical means that at least two supporting points are arranged in the length direction of the first blade is arranged between the first blade and the second blade, the middle end of the first blade is limited by the downward pressing of the fixing component, and the tail end of the first blade is jacked up by the supporting points, so that a downward movement trend can be formed at the front end of the first blade, the blade part of the first blade is tightly propped against the blade part of the second blade, and automatic grinding is realized when the first blade and the second blade perform relative reciprocating angular movement.

Drawings

FIG. 1 is a schematic structural view of a lawnmower blade according to the present application;

FIG. 2 is an exploded view of the present lawnmower blade;

FIG. 3 is a cross-sectional view of the present application's grass cutting blade;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 3;

FIG. 6 is an enlarged view of a portion of FIG. 3;

FIG. 7 is an enlarged view of a portion of FIG. 3;

FIG. 8 is a top view of the present application grass mower;

FIG. 9 is a partial cross-sectional view of a modified embodiment of the present grass mower;

fig. 10 is a schematic view of the structure of the second blade in a modified embodiment of the lawnmower of the present application.

In the figure: 1. a base plate; 2. a first blade; 21. a first blade section; 22. a first limit hole; 3. a second blade; 31. a second blade portion; 32. a second limiting hole; 3A, fixing a blade; 4. a guide sleeve; 41. a first support block; 42. a second support block; 5. a fixing assembly; 51. positioning rings; 511. a limiting part; 512. a through hole; 52. locking the screw; 53. a limit nut; 54. a gasket; 6. a limiting column; 7. a backing plate.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 to 8, the preferred embodiment of the present application is:

the utility model provides a grass cutter, includes bottom plate 1 and is suitable for relative activity's first blade 2 and second blade 3, be equipped with fixed subassembly 5 on the bottom plate 1, fixed subassembly 5 is suitable for and pushes down the middle-end of first blade 2 and second blade 3 and restricts the removal of first blade 2 and second blade 3, and is equipped with two support points that set up along 2 length direction front and back of first blade on bottom plate 1 between first blade 2 and second blade 3, the longitudinal height of support point is wrong mutually, and all be suitable for 2 tail ends jack-up of first blade to make the cutting edge portion of first blade 2 and second blade 3 front end support tightly.

The same with traditional technical scheme, the first blade 2 and the second blade 3 of this embodiment also are for setting up side by side to set up on bottom plate 1 through fixed subassembly 5, and first blade 2 and second blade 3 can realize relative rotation round fixed subassembly 5, thereby realize cutting grass, however, traditional technical scheme has an drawback, the condition that the sword can appear after just working for a long time, thereby lead to cutting grass efficiency to reduce, and will dismantle the blade this moment and get off to grind, it is comparatively inconvenient, extravagant labour.

The inventor of the present application has found that to achieve automatic grinding, it is only necessary to achieve that the blade portions of the first blade 2 and the second blade 3 are tightly abutted together during grass cutting, and the first blade 2 and the second blade 3 can automatically cut or flatten the curled edge during relative reciprocating angular movement. However, if the fixing effect of the fixing assembly 5 is simply increased so that the first blade 2 and the second blade 3 are pressed tightly together, a serious problem occurs: the first blade 2 and the second blade 3 are integrally abutted together, so that the friction is large during relative angular movement, the power is increased when the two blades are driven to move in relative angles, the current is increased, the endurance time of the whole machine is reduced, and the cost is increased.

Therefore, the inventors of the present application made further improvements: because the part for realizing automatic grinding is the front ends of the two blades, only the front ends of the two blades are required to be tightly abutted together, in the embodiment, the bottom plate 1 is provided with two supporting points which can jack up the tail end of the first blade 2, so that the meshing of the upper blade and the lower blade is changed into 20-30 mm, the friction when the first blade 2 and the second blade 3 perform relative angular motion is greatly reduced, and the problem is well solved. Moreover, a more excellent effect is obtained, because the middle end of the first blade 2 is fixed on the bottom plate 1 by the fixing component 5, and the tail end is jacked up by the supporting point, the top end has a downward pressing movement trend, so that the tight supporting effect between the blade parts at the top ends of the first blade 2 and the second blade 3 is better, and the fixing component 5 does not need to be screwed particularly tightly; and the first blade part 21 and the second blade part 31 are tightly abutted together, so that the grass cutting efficiency is higher when grass is cut.

It is worth mentioning that the length direction of the first blade 2 can be understood as a horizontal plane as shown in fig. 3, and the two supporting points are arranged in the same row and back. Also, in the present embodiment, the number of the supporting points is two, but in other embodiments, the number of the supporting points may be more.

In addition, in order to realize that the front and the rear supporting points can be contacted with the first blade 2 and have the supporting effect, the longitudinal heights of the two supporting points are staggered.

Above-mentioned structure has guaranteed reliably that two strong points can provide the support of two tandem for 2 tail ends of first blade along 2 length direction of first blade, compare in the strong point that sets up a rear alone, effectively reduced and pushed down the in-process at fixed subassembly 5, the deformation of 2 parts of first blade between fixed subassembly 5 and the second strong point, can make the high whole of 2 tail ends of first blade higher in the in-service use, the supporting effect to 2 tail ends of first blade is more excellent promptly, correspondingly, can make the blade portion of 2 front ends of first blade and 3 front ends of second blade support tight effect better.

Further, to find a preferable range of the first blade 2 for the convenience of experiment, as shown in fig. 6 and 7, in the present embodiment, two support points are connected in a straight line to form an angle which is also an angle between the first blade 2 and the second blade 3, and the angle is set to α °.

The inventor of the present application finds that the larger the value of α, i.e., the larger the lift amount of the tail end of the first blade 2, the stronger the abutting effect between the first blade 2 and the second blade 3, the stronger the friction force between the two, the larger the deformation amount of the first blade 2 itself, and the higher the possibility of occurrence of chipping. Therefore, the value of α cannot be increased at once, and an excessive value would result in excessive power for driving the two blades, reduced endurance, and an excessive probability of damage to the first blade 2 itself. The inventors of the present application thus preferably determined the range of 0 ° < α ≦ 10 °, in which the first blade 2 and the second blade 3 have the function of automatic grinding, and the power consumption is in a more reasonable interval, and the strength of the blades themselves is sufficient.

Further through a plurality of experiments, the inventor of the application obtains the optimal range of the value of alpha, the alpha is more than or equal to 1 degree and less than or equal to 5 degrees, in the range, the first blade 2 and the second blade 3 can be well and automatically ground, and the power for driving the first blade and the second blade to realize reciprocating angular motion is more reasonable, so that the better endurance time can be ensured, and the service life of the blades can be greatly prolonged.

Further, in this embodiment, the inventor of the present application selects the most preferable technical solution, that is, the included angle α =3 °. Since 3 is the most preferred solution that allows for both auto-grinding and endurance.

In addition, as shown in fig. 2, 3, 6 and 7, in the present embodiment, the guiding sleeve 4 is provided on the tail end of the bottom plate 1, the two ends of the guiding sleeve 4 close to and far from the blade portion are respectively provided with the first supporting block 41 and the second supporting block 42 arranged in the same row, and the first supporting block 41 and the second supporting block 42 are both provided below the first blade 2 so as to be pressed by the first blade 2; the top ends of the first supporting block 41 and the second supporting block 42 are respectively provided with a supporting point, so that the tail end of the first blade 2 is jacked up; and the first and second supporting blocks 41 and 42 are adapted to press down the second blade 3, thereby pressing the second blade 3.

For the above structure, to facilitate manufacturing and installation, two supporting points are disposed at the top ends of the first supporting block 41 and the second supporting block 42 in the guiding sleeve 4, and it should be mentioned that the structure of the supporting points is not limited to this embodiment, that is, the two supporting points may be an integral structure or a split structure, and only two supporting effects along the length of the first blade 2 need to be provided.

In addition, according to the structure, the guide sleeve 4 presses the second blade 3, and then the first blade 2 presses the guide sleeve 4, so that the guide sleeve 4 can be effectively prevented from jumping out, and the axial movement of the second blade 3 can be limited.

In order to realize the limiting effect of the guide sleeve 4 on the second blade 3, in this embodiment, the first support block 41 and the second support block 42 are both suspended, so that the second blade 3 is suitable for being sleeved outside the guide sleeve 4 and is arranged below the first support block 41 and the second support block 42, and the first support block 41 and the second support block 42 are suitable for being abutted against the second blade 3. The above-mentioned hanging arrangement means that the first supporting block 41 and the second supporting block 42 are arranged outside the top end of the guide sleeve 4, and the first supporting block 41 and the second supporting block 42 are not connected to the bottom end of the guide sleeve 4, i.e. the space between the first supporting block 41 and the bottom surface of the guide sleeve 4 and the space between the second supporting block 42 and the bottom surface of the guide sleeve 4 are empty.

In the embodiment, the fixing component 5 and the supporting point are also arranged along the length direction of the first blade 2, and the fixing component 5 is arranged in front of the supporting point. The above structure is that the two supporting points are arranged in tandem on the horizontal plane as shown in fig. 3, the fixing member 5 is arranged in front of the two supporting points, and in the top view as shown in fig. 8, the two supporting points and the central three point of the fixing member 5 are connected to form a line, and the line is arranged in the symmetrical plane of the first blade 2.

As shown in fig. 2 and 4, in the present embodiment, the fixing assembly 5 includes a positioning ring 51, a locking screw 52, a limiting nut 53 and a gasket 54, a bottom end of the positioning ring 51 abuts against the bottom plate 1, the second blade 3 is sleeved outside a bottom end of the positioning ring 51, a top end of the positioning ring 51 has a limiting portion 511 protruding outward, a bottom end of the limiting portion 511 is suitable for pressing the second blade 3 downward, and the first blade 2 is sleeved outside the limiting portion 511. The structure realizes the limiting function of the positioning ring 51 on the second blade 3 on one hand, and enables the positioning ring 51 not to limit the normal rotation of the first blade 2 and the second blade 3 on the other hand.

Furthermore, a through hole 512 is formed in the positioning ring 51, and the locking screw 52 is suitable for penetrating through the through hole 512, then penetrating through the bottom plate 1 to be connected with the limiting nut 53, and is suitable for compressing the positioning ring 51. The above structure is used for realizing the fixed arrangement of the positioning ring 51, thereby realizing the longitudinal limit of the second blade 3.

Further, a spacer 54 is provided between the lock screw 52 and the retainer ring 51, and the spacer 54 is adapted to extend outwardly beyond the limiting portion 511 and to limit the longitudinal movement of the first blade 2 out of the retainer ring 51. The above structure functions to reduce the wear of the locking screw 52 and the retainer ring 51, and functions to limit the first blade 2.

As shown in fig. 8, in the present embodiment, the first blade portion 21 of the first blade 2 and the second blade portion 31 of the second blade 3 are both provided with the cutting edges, thereby forming the blade pair and effectively ensuring the efficiency in cutting grass, and of course, the grass cutting work can be performed by providing the cutting edges only on one blade portion.

Further, to ensure the grass cutting efficiency, in the present embodiment, there is a cutting edge, the base end thereof is spaced from the central axis of the blade, i.e., the axis of the locking screw 52, by a distance C, the tip end thereof is spaced from the axis of the locking screw 52 by a distance D, and the ratio of C to D is 0.39.

And it was measured that in the open edge shown in fig. 8, C was 26.67mm and D was 67.67mm, and thus a ratio of C to D was 0.39.

Of course, in the case of the grass mower, the longer the opening provided in the blade portion, the more the pair of blades can cut the vegetation in one reciprocating angular movement, thereby improving the grass cutting efficiency. However, when the pair of blades cut the vegetation at a time by a large amount, the cutting load acting on the pair of blades becomes large, and therefore the number of reciprocating angular motions of the pair of blades per unit time is reduced. From this, it is found that the length of the blade part cannot be sought at a glance in order to improve the grass cutting efficiency.

The inventors of the present application have found that when the distance C from the base end of the opening edge to the center axis of oscillation of the blade is shorter than the distance D from the tip end of the opening edge to the center axis of oscillation of the blade, the load applied to the pair of blades can be controlled to be relatively small with respect to the amount of vegetation to be cut.

A similar point of view also exists in the prior art, but it is described in the prior art that a preferable range of the ratio of the distance C to the distance D is 0.5 times or less.

Different from the prior art, the inventor of the application finally obtains the grass-cutting knife with the ratio of the distance C to the distance D being 0.39 in the embodiment through a plurality of experiments, and the grass-cutting performance of the grass-cutting knife is more excellent.

In addition, in the embodiment, the first blade 2 and the second blade 3 are both suitable for being connected with an external driving device and driven by the external driving device to swing, and the blade parts of the first blade 2 and the second blade 3 are suitable for repeatedly crossing and separating. The grass cutter is a double-acting grass cutter, and the two blades are connected with the driving device to swing, so that the movement stroke of each blade is halved, the load is reduced, and the reciprocating angular movement times in unit time can be effectively improved; for grass, the single cutting effect is stronger, and the cutting times in unit time are increased. Therefore, the double-acting grass mower can better improve the grass cutting efficiency. The performance in actual use is as follows: some grass cutters can cut soft grass, but hard grass, and the double-acting grass cutters can cut both soft and hard grass.

It is worth mentioning that, because the grass-cutting knife is double-acting type, the second blade 3 also needs to swing, so as to effectively avoid the abrasion caused by the direct contact between the second blade 3 and the bottom plate 1 during the movement, and because the bottom plate 1 is internally provided with a certain hollow structure, the top surface is uneven, the second blade 3 is not easy to be positioned during the installation, and the support for the second blade 3 is not enough. Therefore, in order to solve the above problem, in the present embodiment, a shim plate 7 is further provided between the second blade 3 and the base plate 1.

As shown in fig. 9 and 10, a modified embodiment of the present application is: the first blade 2 is adapted to be connected to and swing by an external driving means, and the first blade part 21 and the second blade part 31 are adapted to repeatedly intersect and separate. Compared with a double-acting grass mower, the grass mower has the advantages that although the grass cutting efficiency is reduced to a certain degree, the power consumption during working is reduced to a certain degree, and the cruising ability of the grass mower is improved.

Therefore, the double-acting type or the single-acting type is selected, and most of the double-acting type or the single-acting type needs to be considered according to actual requirements.

In addition, since the second blade 3 of the single-acting grass mower does not need to swing, in order to simplify the structure and facilitate the manufacturing and installation, in the present modified embodiment, the second blade 3 is a fixed blade 3A, which can replace the backing plate 7 in the double-acting grass mower, and thus, the similar functions can be achieved.

The specific structure of the fixed blade 3A is shown in fig. 9: an outwardly projecting mounting portion is provided at the trailing end, and the mounting portion is adapted to be inserted into the bottom plate 1 so that the rotation of the fixed blade 3A is restricted.

Further, as shown in fig. 5, in the present embodiment, a limiting post 6 is fixedly disposed on the bottom plate 1, and the first blade 2 and the second blade 3 are respectively disposed with a first limiting hole 22 and a second limiting hole 32, and the limiting post 6 passes through the first limiting hole 22 and the second limiting hole 32 and is adapted to cooperate with the first limiting hole 22 and the second limiting hole 32 to limit the rotation range of the first blade 2 and the second blade 3. The structure is used for limiting the left-right swing of the first blade 2 and the second blade 3 in the double-acting grass mower.

Moreover, when the grass shears are actually installed, most external driving devices comprise eccentric blocks, the eccentric blocks need to be arranged at the centers of the guide sleeves 4, but if the rotation ranges of the first blade 2 and the second blade 3 are not limited, when the offset angles of the first blade and the second blade are too large, the installation of the eccentric blocks is inconvenient, and therefore the arrangement of the limiting columns 6 also has the advantage that the eccentric blocks can smoothly enter the two blades and can be installed at the centers of the guide sleeves 4.

In addition, as shown in fig. 9, in the modified embodiment, the second blade 3 is fixedly provided with a limiting post 6, the first blade 2 is provided with a first limiting hole 22, and the limiting post 6 passes through the first limiting hole 22 and is adapted to cooperate with the first limiting hole 22 to limit the relative rotation range of the first blade 2 and the second blade 3.

In addition, the technical purpose of limiting the rotation range can be realized only by setting the limiting hole to be a waist-shaped structure.

It should be noted that the above two structures are respectively an embodiment of a double-acting type and a single-acting type, and the specific implementation is not limited, for example, in the double-acting type, a manner of arranging the limiting column 6 on the second blade 3 may also be adopted, and only the length of the waist-shaped hole and the initial position of the limiting column 6 in the first limiting hole 22 need to be determined during manufacturing and installation; or the single-acting type can also adopt the mode that the limiting column 6 is arranged on the bottom plate 1, and only the through hole 512 is arranged on the second blade 3 so that the limiting column 6 can pass through; or the single-acting type can also adopt the mode that a guide groove is arranged on the second blade 3, and a limit block is arranged at the bottom end of the first blade 2, and the like.

And, the grass-cutting sword of this application can be divided into the grass-cutting sword of two kinds of 120mm and 160mm according to its effective grass-cutting length, and the grass-cutting sword of 120mm type because its area of contact with the grass is little, and the load is not big, and too big blade thickness is reasonable inadequately, can produce the waste, consequently the grass-cutting sword of 120mm type, its first blade 2 and second blade 3 all adopt 1.2mm thickness. The 160mm type grass cutting knife has the advantages that the load is increased, the thickness is insufficient, the blade edges on two sides of the 160mm type grass cutting knife are too soft, the grass cutting efficiency is affected, and therefore the thickness of the first blade 2 and the second blade 3 is 1.6 mm. It is worth mentioning that the two types mentioned above are provided for the purpose of pursuing high practicality, and do not limit the embodiments of the present application, and blades of other lengths and thicknesses may be used.

In addition, in this embodiment, the retainer ring 51 and the guide sleeve 4 are made of powder metallurgy, because in actual use, due to the rotation of the blade, the two directly contact with the blade, and are easily worn, and the powder metallurgy has good wear resistance, which can effectively solve the above problems.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (12)

1. The utility model provides a grass cutter, includes bottom plate, first blade and second blade, its characterized in that: the first blade and the second blade are suitable for relative movement, a fixing component is arranged on the bottom plate and is suitable for limiting the movement of the first blade and the second blade; at least two supporting points arranged along the length direction of the first blade are arranged between the first blade and the second blade on the bottom plate, the longitudinal heights of the supporting points are staggered, and the supporting points are suitable for jacking the tail end of the first blade so as to enable the blade parts at the front ends of the first blade and the second blade to be tightly abutted; and an included angle alpha is formed between the tail end of the first blade and the second blade after the tail end of the first blade is lifted, wherein alpha is more than 0 degree and less than or equal to 10 degrees.

2. A lawnmower blade according to claim 1, wherein: alpha is more than or equal to 1 degree and less than or equal to 5 degrees.

3. A lawnmower blade according to claim 2, wherein: α =3 °.

4. A lawnmower blade according to claim 1, wherein: the first blade and the second blade are both suitable for being connected with an external driving device and swing under the driving of the external driving device, and the blade parts of the first blade and the second blade are suitable for being repeatedly crossed and far away.

5. A lawnmower blade according to claim 1, wherein: the bottom plate is close to and keeps away from on the tail end the both sides of cutting edge portion are equipped with first supporting shoe and second supporting shoe respectively, first supporting shoe with the second supporting shoe is all located first blade with for arranging the setting with between the second blade, just first supporting shoe with second supporting shoe top has one respectively the strong point.

6. A lawnmower blade according to claim 5, wherein: the bottom plate tail end is provided with a guide sleeve, the first supporting block and the second supporting block are arranged at two ends of the knife edge part respectively, and the first supporting block and the second supporting block are suitable for pressing down the second blade.

7. A lawnmower blade according to claim 6, wherein: the first supporting block and the second supporting block are both arranged in a suspended mode, so that the second blade is suitable for being sleeved on the outer side of the guide sleeve and arranged below the first supporting block and the second supporting block, and the bottom ends of the first supporting block and the second supporting block are suitable for abutting against the second blade.

8. A lawnmower blade according to claim 1, wherein: first blade with the second blade is all established the cover and is established outside the fixed subassembly, first blade and/or be equipped with the edging on the cutting edge portion of second blade, and have one at least the base end of edging arrives the distance of fixed subassembly is C, and the front end arrives the distance of fixed subassembly is D, and the ratio of C and D is 0.39.

9. A lawnmower blade according to claim 1, wherein: the fixing component and the supporting point are also arranged along the length direction of the first blade, and the fixing component is arranged in front of the supporting point; the fixing component comprises a positioning ring which is fixedly arranged, the bottom end of the positioning ring is abutted against the bottom plate, the second blade is sleeved outside the bottom end of the positioning ring, a limiting part which protrudes outwards is arranged at the top end of the positioning ring, and the bottom end of the limiting part is suitable for pressing the second blade downwards; the first blade is sleeved on the outer side of the limiting part.

10. A lawnmower blade according to claim 9, wherein: the fixing assembly further comprises a locking screw, a limiting nut and a gasket, a through hole is formed in the locating ring, the locking screw is suitable for penetrating through the through hole and then penetrates through the bottom plate, the limiting nut is connected with the bottom plate and is suitable for compressing the locating ring, the gasket is arranged between the locking screw and the locating ring, and the gasket is suitable for extending out of the limiting portion and limiting the first blade to longitudinally move and separate from the locating ring.

11. A lawnmower blade according to claim 4, wherein: the bottom plate is fixedly provided with a limiting column, the first blade and the second blade are respectively provided with a first limiting hole and a second limiting hole, and the limiting column is suitable for penetrating through the first limiting hole and the second limiting hole and is suitable for being matched with the first limiting hole and the second limiting hole to limit the rotation range of the first blade and the second blade.

12. A lawnmower blade according to claim 1, wherein: the first blade is suitable for being connected with an external driving device and driven by the external driving device to swing; the tail end of second blade is equipped with outside bellied installation department, just the installation department is suitable for inserting in the bottom plate, thereby the realization is right the spacing setting of second blade, just first blade with the cutting edge portion of second blade is suitable for alternately repeatedly and keeps away from.

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