阅读说明：本技术 一种带有快捷碎草机构的割草机 (Mower with quick grass chopping mechanism ) 是由 谢安源 刘超鹏 史新明 陈兰 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种带有快捷碎草机构的割草机,涉及园艺辅助器械技术领域,包括割草机外壳和安装在割草机外壳中的切割刀片,所述切割刀片中心上开设一安装孔,所述刀座配合平键固定安装在发动机机轴底端,所述发动机机轴活动穿插过割草机外壳上,通过设置切割刀片的刀片壁由上升部、凸出部、下降部和外端部组成,倾斜状的上升部和下降部连接凸出部和外端部,使凸出部和外端部所在的高度不同,从而使刀片壁形成两个不同高度的切割点,在切割过程中同时对杂草进行两侧切割,并且设置两个切割刀片,两个切割刀片上下垂直分布并且一同运转,运转时有四个不同高度的切割点,可同时对杂草进行多段切割,可以快速切碎杂草,提高碎草效率。(The invention discloses a mower with a quick grass chopping mechanism, which relates to the technical field of gardening auxiliary instruments and comprises a mower shell and cutting blades arranged in the mower shell, wherein a mounting hole is formed in the center of each cutting blade, a cutter holder is fixedly arranged at the bottom end of an engine shaft in a matching manner with a flat key, the engine shaft movably penetrates through the mower shell, a blade wall provided with the cutting blades consists of an ascending part, a protruding part, a descending part and an outer end part, the inclined ascending part and the inclined descending part are connected with the protruding part and the outer end part, so that the heights of the protruding part and the outer end part are different, two cutting points with different heights are formed on the blade wall, two sides of weeds are simultaneously cut in the cutting process, the two cutting blades are arranged, the two cutting blades are vertically distributed up and down and operate together, and four cutting points with different heights are formed during operation, can carry out the multistage cutting to weeds simultaneously, can cut up weeds fast, improve garrulous grass efficiency.)

1. A lawn mower with a quick grass cutting mechanism, comprising a mower housing (2) and two cutting blades (5) mounted in the mower housing (2), characterized in that: cutting blade (5) are seted up a mounting hole (52) on the center, two cutting blade (5) are vertical to distributing, are located the top cutting blade (5) are through bolt (7) fixed mounting on blade holder (4), be provided with between cutting blade (5) bottom and bolt (7) packing ring (6), blade holder (4) cooperation parallel key (3) fixed mounting is in engine crankshaft (1) bottom, on lawn mower shell (2) was alternated in engine crankshaft (1) activity, be located the top cutting blade (5) bottom is provided with two adjusting part (8), two adjusting part (8) are located mounting hole (52) both sides respectively, adjusting part (8) bottom sets up on cutting blade (5) top that is located the below.

2. The mower with quick grass cutting mechanism according to claim 1, wherein the cutting blade (5) comprises blade walls (51) at both ends thereof, and the front side of the blade walls (51) is provided with a slope gradually decreasing in height along the front side of the blade walls (51) to form blade edges (516).

3. The mower with the grass chopping mechanism according to claim 2, wherein the blade wall (51) comprises a rising part (511), a protruding part (512), a falling part (513) and an outer end part (515), the rising part (511) and the falling part (513) are connected to two ends of the protruding part (512) in an inclined manner, and the bottom end of the falling part (513) is connected with one end of the outer end part (515).

4. A lawnmower with a grass cutting mechanism according to claim 3, wherein the angle between the protrusion (512) and the rising portion (511) is the same as the angle between the protrusion (512) and the falling portion (513).

5. The mower with quick grass cutting mechanism according to claim 3, wherein the whole of the lowered part (513) and the outer end part (515) of the blade wall (51) is turned up obliquely along the blade edge end (516).

6. The mower with the grass chopping mechanism according to claim 2, wherein the cutting blade (5) is integrally formed, the cutting blade (5) is of a fan blade structure, and blade walls (51) at two ends of the cutting blade (5) are axially symmetrically distributed around the mounting hole (51).

7. The mower with the grass chopping mechanism according to claim 1, wherein the adjusting assembly (8) comprises a connecting rod (81), a threaded sleeve (83) and a sleeve post (84), the top end of the connecting rod (81) is fixedly connected to the bottom end of the uppermost cutting blade (5), the bottom end of the connecting rod (81) is provided with a threaded post (82), the diameter of the connecting rod (81) is smaller than that of the threaded post (82), the threaded sleeve (83) is connected with the threaded post (82) through threads, the top end of the threaded sleeve (83) is fixedly connected with a retaining ring (85), the diameter of the inner ring of the retaining ring (85) is smaller than that of the threaded post (82), the outer wall of the bottom end of the threaded sleeve (83) is fixedly provided with a limiting ring (831), and the inner wall of the sleeve post (84) is provided with a limiting groove (841) matched with the limiting ring (831), the bottom end of the threaded sleeve (83) is rotatably clamped in the sleeve column (84) through a limiting ring (831), the bottom end of the sleeve column (84) is fixedly connected to the top end of the cutting blade (5) located at the lowest position, and the thread directions of the threaded sleeve (82) in the adjusting assembly (8) are opposite.

8. The mower with the quick grass chopping mechanism according to claim 3, wherein the outer end part (515) is provided with three tooth grooves (514) on the side deviating from the blade end (516), and one corner of the outermost end of the outer end part (515) far away from the blade end (516) is in the shape of a circular arc to form a circular arc end (517).

9. Mower with grass chopping mechanism according to claim 1, characterized in that the mower housing (2) is shaped like a scroll.

10. Mower with grass chopping mechanism according to claim 1, characterized in that said gasket (6) is a butterfly gasket.

Technical Field

The invention relates to the technical field of gardening auxiliary instruments, in particular to a mower with a quick grass chopping mechanism.

Background

With the continuous progress of computer technology and artificial intelligence technology, automatic mowers similar to intelligent robots have started to walk slowly into people's lives. The automatic mower can automatically cut grass and charge in the lawn of a user without user interference. The automatic working system does not need to be invested in energy management after being set once, and frees users from tedious and time-consuming and labor-consuming housework such as cleaning, lawn maintenance and the like, wherein a mower cutting blade is a core part of a mower, and the cutting speed and the cutting efficiency of the mower are related to the structure of the mower cutting blade.

The cutting blade of the existing mower on the market is in a planar mode mostly, so that the cutting blade needs to be cut from high to low for multiple times in the cutting process, and the grass chopping efficiency is low, and the time is consumed.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a mower with a quick grass chopping mechanism.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a lawn mower with swift grass-chopping mechanism, includes lawn mower shell and installs two cutting blade in the lawn mower shell, set up a mounting hole, two in the cutting blade center cutting blade is vertical to distributing, is located the top cutting blade passes through bolt fixed mounting on the blade holder, be provided with the packing ring between cutting blade bottom and the bolt, blade holder cooperation parallel key fixed mounting is in engine shaft bottom, engine shaft activity alternates on the lawn mower shell, is located the top cutting blade bottom is provided with two adjusting part, two adjusting part is located the mounting hole both sides respectively, the adjusting part bottom sets up on the cutting blade top that is located the below.

In any of the above solutions, it is preferable that the cutting blade includes blade walls at both ends thereof, and a front side of the blade wall is provided with a slope, and the slope gradually decreases in height along the front side of the blade wall to form a blade edge.

In any of the above aspects, preferably, the blade wall includes a rising portion, a protruding portion, a falling portion, and an outer end portion, the rising portion and the falling portion are connected to two ends of the protruding portion in an inclined manner, and a bottom end of the falling portion is connected to one end of the outer end portion.

In any of the above aspects, it is preferable that an angle between the protruding portion and the rising portion is the same as an angle between the protruding portion and the falling portion.

In any of the above embodiments, preferably, the entire lowered part and the outer end part of the blade wall are turned up obliquely along the blade edge.

In any of the above schemes, preferably, the cutting blade is integrally formed, the cutting blade is of a fan blade structure, and the blade walls at the two ends of the cutting blade are distributed in an axisymmetric manner by taking the mounting hole as the center.

Preferred in any of the above-mentioned schemes, the adjusting part includes connecting rod, threaded sleeve and cover post, connecting rod top fixed connection is in the cutting blade bottom that is located the top, the connecting rod bottom sets up a threaded post, the connecting rod diameter is less than the diameter of threaded post, threaded sleeve passes through screw thread and threaded post connection, a threaded sleeve top fixed connection fender ring, fender ring inner circle diameter is less than the diameter of threaded post, fixed cover is equipped with the spacing ring on the threaded sleeve bottom outer wall, set up on the cover post inner circle wall with spacing ring assorted spacing groove, the threaded sleeve bottom rotates the joint in the cover post through the spacing ring, cover post bottom fixed connection is on the cutting blade top that is located the below, two screw thread opposite direction on the threaded post in the adjusting part.

In any of the above schemes, preferably, three tooth sockets are disposed on one side of the outer end portion deviating from the blade end, and an angle of the outermost end of the outer end portion far from the blade end is arc-shaped to form an arc end.

In any of the above aspects, preferably, the mower housing has a spiral shape.

In any of the above solutions, preferably, the gasket is a butterfly gasket.

Compared with the prior art, the invention has the beneficial effects that:

1. blade wall through setting up cutting blade is by the portion of rising, the bulge, the portion of falling and outer tip component, the bulge is connected with outer tip to the portion of rising and the portion of falling of slope form, make the height difference at bulge and outer tip place, thereby make the blade wall form the cutting point of two co-altitude, carry out both sides cutting to weeds simultaneously in cutting process, and set up two cutting blade, vertical distribution about two cutting blade and together operation, four co-altitude cutting points during the operation, can carry out the multistage cutting to weeds simultaneously, can cut up weeds fast, improve garrulous grass efficiency.

2. Through setting up lawn mower shell shape for the vortex form, can be more effectual increase when cutting blade is rotatory smooth and easy and the trend that the air current is steadily going with the air current, reduce air resistance to increase cutting efficiency.

3. Be the flabellum structure through setting up cutting blade, the blade wall at cutting blade both ends uses the mounting hole to be axisymmetric form distribution as the center to portion and outer tip wholly follow cutting edge end slant jack-up, the outer tip's of cooperation circular arc end can reduce the resistance when cutting blade rotates simultaneously, and the noise can be reduced simultaneously to the raise the efficiency.

4. Through set up adjusting part between two cutting blades that distribute perpendicularly from top to bottom, can adjust the distance between two cutting blades to can change the size of garrulous grass, can cut out the weeds of different length according to different demands, convenient later recycle is weeds.

5. The adjusting component is arranged to be composed of a connecting rod, a threaded sleeve and a sleeve column, the bottom end of the connecting rod is connected with the threaded column, the diameter of the threaded sleeve is smaller than that of the threaded column, the connecting rod can be sleeved in a baffle ring which is fixedly connected to the top end of the threaded sleeve, the threaded sleeve is connected with the threaded column, under the blocking of the baffle ring, the threaded sleeve can not be separated from the threaded column all the time in the rotating process, so that the cutting blade located at the lowest part can be prevented from falling off, the bottom end of the sleeve column is fixedly connected to the top of the cutting blade located at the lowest part, the bottom end of the threaded sleeve is movably and rotatably connected in the sleeve column through the limiting ring, the rotation of the threaded sleeve is not blocked while the threaded sleeve is connected, the directions of threads in the two adjusting components are opposite, when the distance between the two cutting blades is adjusted, the two threaded sleeves need to be simultaneously rotated in opposite directions, and the height of the cutting blade located at the lowest part is adjusted, the cutting blade that is located the below simultaneously remains the level all the time to the screw thread on two adjusting part of reverse setting can be so that the cutting blade that is located the below is difficult for droing when the operation, and is more firm.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is an exploded view of the overall structure proposed by the present invention;

FIG. 2 is a schematic view of the overall structure proposed by the present invention;

FIG. 3 is a schematic view of a cutting blade according to the present invention;

FIG. 4 is a schematic view of a blade wall structure according to the present invention;

fig. 5 is an exploded view of the adjustment assembly according to the present invention.

In the figure: 1. an engine crankshaft; 2. mower housings; 3. a flat bond; 4. a tool apron; 5. a cutting blade; 51. a blade wall; 511. a rising part; 512. a projection; 513. a descending section; 514. a tooth socket; 515. an outer end portion; 516. a blade end; 517. an arc end; 52. mounting holes; 6. a gasket; 7. a bolt; 8. an adjustment assembly; 81. a connecting rod; 82. a threaded post; 83. a threaded bushing; 831. a limiting ring; 84. sleeving a column; 841. a limiting groove; 85. and (4) a baffle ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

For better understanding of the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the drawings and the detailed description of the present invention.

Examples

Referring to fig. 1, 2, 3 and 4, a lawn mower with a grass chopping mechanism comprises a mower housing 2 and two cutting blades 5 installed in the mower housing 2, wherein the two cutting blades 5 are structurally identical, the length of a blade wall on the lowermost cutting blade 5 is less than or equal to the length of a blade wall 51 on the uppermost cutting blade 5, the two cutting blades 5 are vertically distributed and work together, four cutting points with different heights are arranged in the cutting process, so that the grass chopping efficiency can be improved, a mounting hole 52 is formed in the center of each cutting blade 5, a bolt 7 is conveniently installed on a cutter holder 4, the two cutting blades 5 are vertically distributed, the uppermost cutting blade 5 is fixedly installed on the cutter holder 4 through the bolt 7, a gasket 6 is arranged between the bottom end of each cutting blade 5 and the bolt 7, can prevent thereby bolt 7 drops so that cutting blade 5 drops, blade holder 4 cooperation parallel key 3 fixed mounting is in engine crankshaft 1 bottom, on mower housing 2 was passed through in engine crankshaft 1 activity, be located the top cutting blade 5 bottom is provided with two adjusting part 8, can adjust the distance between two cutting blade 5 through setting up adjusting part 8 to can change the size of garrulous grass, can cut out the weeds of different length according to different demands, convenient later recycle weeds, two adjusting part 8 is located mounting hole 52 both sides respectively, ensures to be located the cutting blade 5 of below and remains the level all the time, adjusting part 8 bottom sets up on the cutting blade 5 top that is located the below.

As shown in fig. 1, 2, 3 and 4, the cutting blade 5 includes blade walls 51 at both ends thereof, and the front sides of the blade walls 51 are provided with slopes which gradually decrease in height along the front sides of the blade walls 51 to form blade ends 516 for cutting up weeds.

As shown in fig. 1, 2, 3 and 4, the blade wall 51 includes a rising portion 511, a protruding portion 512, a falling portion 513 and an outer end portion 515, the rising portion 511 and the falling portion 513 are connected to two ends of the protruding portion 512 in an inclined manner, so that the height of the protruding portion 512 is higher than the height of the outer end portion 515, the same blade wall 51 has two cutting points with different heights, the same weed is cut simultaneously in the grass chopping process, the grass chopping effect can be achieved quickly, and the bottom end of the falling portion 513 is connected to one end of the outer end portion 515.

As shown in fig. 1, 2, 3 and 4, the included angle between the protruding portion 512 and the rising portion 511 is the same as the included angle between the protruding portion 512 and the falling portion 513, and the protruding portion 512 is made to be horizontal by setting the included angles to be the same, which is beneficial to cutting weeds neatly and improving efficiency.

As shown in fig. 1, 2, 3 and 4, the whole of the descending part 513 and the outer end part 515 of the blade wall 51 is turned up along the blade end slant 516, so that the air resistance of the cutting blade 5 during operation can be reduced, and the grass chopping efficiency can be improved.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the cutting blade 5 is formed integrally, the cutting blade 5 is formed by forming integrally, so that the strength of the whole cutting blade 5 can be increased, the cutting blade 5 is prevented from being broken in long-term use, the service life of the cutting blade 5 is prolonged, meanwhile, compared with a welding or splicing mode, the cost is lower, and the processing efficiency is high, the cutting blade 5 is of a fan blade structure, the blade walls 51 at the two ends of the cutting blade 5 are distributed in an axisymmetric manner by taking the mounting hole 51 as a center, so that the cutting blade 5 rotates like a fan when rotating, the blade walls 51 at the two ends of the cutting blade 5 simultaneously mow, and the grass chopping efficiency can be improved.

As shown in fig. 1, 2 and 5, the adjusting assembly 8 includes a connecting rod 81, a threaded sleeve 83 and a sleeve column 84, the top end of the connecting rod 81 is fixedly connected to the bottom end of the uppermost cutting blade 5, the bottom end of the connecting rod 81 is provided with a threaded column 82, the diameter of the connecting rod 81 is smaller than that of the threaded column 82, so that the connecting rod 81 can be sleeved in a stop ring 85, the threaded sleeve 83 is connected with the threaded column 82 through threads, the threaded sleeve 83 rotates on the threaded column 82 through rotation of the threaded sleeve 83 and moves upwards or downwards, so that the lowermost cutting blade 5 can be driven to move upwards or downwards, the top end of the threaded sleeve 83 is fixedly connected with a stop ring 85, the inner ring diameter of the stop ring 85 is smaller than that of the threaded column 82, so that the threads 82 cannot pass through the stop ring 85, and the stop ring 85 is arranged above the threaded column 82, so that the threaded sleeve 83 of the threaded column 82 can be prevented from being disengaged, the threaded sleeve 83 is always connected with the threaded column 82, the cutting blade 5 located at the bottom in the adjusting process can be prevented from falling off, the adjusting distance cannot be smaller than the height of the threaded sleeve 83, the cutting blade 5 cannot contact with each other all the time, the normal operation of the mower is prevented from being influenced, the limiting ring 831 is fixedly sleeved on the outer wall of the bottom end of the threaded sleeve 83, the limiting groove 841 matched with the limiting ring 831 is formed in the inner ring wall of the sleeve column 84, the bottom end of the threaded sleeve 83 is rotationally clamped in the sleeve column 84 through the limiting ring 831, the threaded sleeve 83 is connected to the sleeve column 84 in a rotationally clamping manner through the always-threaded sleeve 83, the effect of supporting the threaded sleeve 83 can be achieved when the rotation of the threaded sleeve 83 is not influenced, the threaded sleeve 83 is prevented from falling off, the bottom end of the sleeve column 84 is fixedly connected to the top end of the cutting blade 5 located at the bottom, and the thread directions of the threaded column 82 in the adjusting assembly 8 are opposite, when adjusting the distance between two cutting blade 5, need rotate two threaded sleeve 83 toward opposite direction simultaneously to rotate two threaded sleeve 83 simultaneously and can guarantee to be located cutting blade 5 of below and remain the level all the time, reverse screw thread that sets up on two adjusting part 8 can not influence threaded sleeve 83 when cutting blade 5 receives one-way windage resistance in the operation, makes to be located the cutting blade of below and is difficult for droing, and is more firm.

As shown in fig. 1, 2, 3 and 4, three tooth grooves 514 are formed on one side of the outer end portion 515, which is deviated from the blade end 516, so that air resistance is reduced, and efficiency is improved, one corner of the outermost end of the outer end portion 515, which is far away from the blade end 516, is arc-shaped to form an arc end 517, and the arc end 517 increases air flow, reduces air resistance, and improves the grass-crushing efficiency of the grass chopper.

The mower shell 2 comprises a material dredging layer, a reinforcing layer, a flame retardant layer and a waterproof layer which are sequentially arranged from inside to outside, wherein the material dredging layer is composed of the following raw materials in parts by weight: 50-70 parts of PET, 30-40 parts of nano-silicon dioxide, 5-8 parts of graphite powder, 1-5 parts of stearate, 2-5 parts of compatilizer, 1-2 parts of color master batch and 10-15 parts of ABS resin, the PET material has good toughness, the strength of the mower housing 2 can be increased, the stearate is added to increase the stability of the mower housing 2, and the service life of the mower housing 2 can be prolonged.

In the mower with the quick grass chopping mechanism provided by the embodiment of the invention, in a preferred embodiment, the sparse material layer is composed of the following raw materials in parts by weight: 50 parts of PET, 30 parts of nano-scale silicon dioxide, 5 parts of graphite powder, 1 part of stearate, 2 parts of compatilizer, 1 part of color master batch and 10 parts of ABS resin, wherein in a more preferable embodiment, the hydrophobic layer is composed of the following raw materials in parts by weight: 70 parts of PET, 40 parts of nano-silicon dioxide, 8 parts of graphite powder, 5 parts of stearate, 5 parts of compatilizer, 2 parts of color master batch and 15 parts of ABS resin. Therefore, the polyethylene terephthalate is the most important kind of thermoplastic polyester in the PET, and its english name is polyethylene terephthalate (PET) or PEIT (hereinafter referred to as PET), which is commonly called polyester resin. The PET-based composite material is a polycondensate of terephthalic acid and ethylene glycol, which is commonly called as thermoplastic polyester or saturated polyester together with PBT, and through the arrangement of the PET, a hydrophobic material layer has good mechanical property, higher impact strength and better folding resistance; through setting up nanometer silica, can improve the intensity, toughness, waterproof performance and the ageing resistance in the hydrophobic material layer, through setting up graphite powder, can make its fire resistance stronger, through setting up ABS resin, can make the hydrophobic material layer comprehensive properties better, and impact strength is higher, chemical stability.

In the mower with the rapid grass chopping mechanism, the reinforcing layer is formed by compounding PET and PP according to the mass ratio of 5: 7-9, and the toughness of PET and PP materials is utilized, so that the overall strength of the mower shell 2 is increased, and the mower shell is not easy to break.

In the mower with the rapid grass chopping mechanism provided by the embodiment of the invention, the flame-retardant layer is composed of the following raw materials in parts by weight: 2-5 parts of glass fiber, 2-8 parts of phenolic resin and 2-5 parts of diatomite, wherein the glass fiber has the effects of good insulativity, strong heat resistance and good corrosion resistance, the strength and the heat resistance of the mower shell 2 can be improved by adding the phenolic resin and the diatomite, and the cost is reduced, and in a preferred embodiment, the flame-retardant layer is composed of the following raw materials in parts by weight: 2 parts of glass fiber, 2 parts of phenolic resin and 2 parts of diatomite; in a more preferred embodiment, the flame-retardant layer is composed of the following raw materials in parts by weight: 5 parts of glass fiber, 8 parts of phenolic resin and 5 parts of diatomite. Through adopting glass fiber, can make fire-retardant layer tensile strength bigger, the heat resistance is good, does not influence intensity when the temperature reaches 300 ℃, has good electrical insulation, through adopting phenolic resin, can make fire-retardant layer have the advantage of low cigarette low toxicity to can also make glass fiber, phenolic resin and diatomaceous earth bond more, through adopting diatomaceous earth, can make wear-resisting, heat-resisting stronger of fire-retardant layer, can provide excellent surface properties for fire-retardant layer.

In the mower with the rapid grass chopping mechanism provided by the embodiment of the invention, the waterproof layer is composed of the following raw materials in parts by weight: 20-25 parts of isocyanate, 2-10 parts of polyether, 3-6 parts of rubber and 2-5 parts of asphalt. In a preferred embodiment, the waterproof layer is composed of the following raw materials in parts by weight: 20 parts of isocyanate, 2 parts of polyether, 3 parts of rubber and 2 parts of asphalt; in a more preferred embodiment, the waterproof layer is composed of the following raw materials in parts by weight: 25 parts of isocyanate, 10 parts of polyether, 6 parts of rubber and 5 parts of asphalt. Isocyanate and polyether are subjected to polymerization reaction to form a prepolymer containing isocyanate groups, and then rubber and asphalt are added to enable the waterproof layer to have the effects of high strength, large elongation, strong adsorbability, difficulty in falling and the like, and meanwhile, the surface of the mower shell 2 is isolated from water, so that the waterproof effect can be achieved.

As shown in fig. 1 and 2, the mower housing 2 is formed in a spiral shape, and by forming the mower housing 2 in a spiral shape, the smoothness of the airflow and the tendency of the airflow to go up steadily when the cutting blade 5 rotates can be increased more effectively, the air resistance can be reduced, and the cutting efficiency can be increased.

As shown in fig. 1 and 2, the washer 6 is a butterfly washer, which can achieve a shock absorption effect, reduce the shaking of the cutting blade 5 during the rotation process, and avoid affecting the cutting rate.

The two threaded sleeves 83 are rotated reversely according to the length of the required grass chopping, the threaded sleeves 83 are rotated and moved on the threaded columns 82 at the bottom ends of the connecting rods 84, the cutting blade 5 positioned at the lowest part is moved to a proper position, the engine shaft 1 is rotated, the cutter seat 4 is rotated, the cutting blade 5 is fixedly arranged at the bottom end of the cutter seat 4 through the bolt 7, the cutting blade 5 rotates along with the engine shaft 1, the grass chopping operation is carried out, the inclined ascending part 511 and the inclined descending part 513 on the blade wall 51 are used for connecting the convex part 512 and the outer end part 515, the convex part 512 and the outer end part 515 are different in height, so that the blade wall 51 forms two cutting points with different heights, and the cutting blades 5 are two, so that four cutting points with different heights are formed in the cutting process, can carry out the multistage cutting to weeds simultaneously in cutting process, cutting blade 5 both ends when moving blade wall 51 rotates syntropy normal running fit simultaneously can cut weeds fast to can cut up weeds fast, improve garrulous grass efficiency, mower housing 2 shape design is the vortex form, can more effectual increase the smooth and easy and air current of air current are the trend of going steadily when cutting blade 5 is rotatory, cooperates the cutting blade 5 of flabellum structure and the structure that falls portion 513 and outer tip 515 on blade wall 51 are whole along cutting edge end 516 slant turn-up, cooperates simultaneously the circular arc end 517 of outer tip 515 can reduce the resistance when cutting blade 5 rotates, thereby increases cutting efficiency.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.