Grass chopper

Abstract

The utility model discloses a grass chopper which comprises a chassis, a power mechanism, a grass chopping mechanism and a crawler belt mechanism, and a driving wheel of the crawler belt mechanism is connected to a walking output shaft of a walking power assembly through a non-cantilever supporting structure. The grass chopping mechanism comprises a front blocking cover and a chopping assembly, the two shaft ends of the chopping assembly are rotationally installed in the lower portion of the front blocking cover, one shaft end of the chopping assembly is connected with the grass chopping power assembly, and the rear end of the front blocking cover is rotationally installed on the chassis through a blocking cover rotating assembly. A blocking cover lifting assembly for driving the front blocking cover to swing around the blocking cover rotating assembly is further arranged between the chassis and the front blocking cover, and a row of anti-splashing blocking chains capable of naturally drooping are arranged at the front end of the front blocking cover in the width direction. According to the novel grass chopper, multi-direction improvement is carried out on a multi-transmission grass chopper, the stubble height can be adjusted, chopped grass is prevented from splashing, and non-cantilever stable output is achieved.

Description

Technical Field

[0001] The utility model relates to a straw crusher. Background Art

[0002] With the development of society and the improvement of the degree of mechanization, various agricultural machines have begun to be widely used in agricultural operations. A straw crusher is a machine for cutting various grasses and stem plants such as millet straw, rice straw, wild grass, wheat straw, and corn straw. The straw crusher includes a chassis, a power mechanism arranged above the chassis, a straw crushing mechanism arranged in front of the chassis, and crawler mechanisms arranged on both sides of the chassis. The cutting knives in the straw crushing mechanism are used to cut and crush grasses and stem plants. The crawler mechanisms, as walking components, are used to realize operation walking in the straw crushing state and transfer movement in the non-straw crushing state. Currently, the straw crusher has the following problems: First, the height of the current straw crushing mechanism cannot be adjusted, and the stubble height cannot be adjusted, so it cannot well meet the stubble requirements of different plants; Second, the driving wheels of the crawler mechanisms are installed at the cantilever end of the walking output shaft, which affects the service life of the output shaft; Third, when the straw crushing mechanism crushes straw, a large amount of crushed straw splashes forward, easily flying onto the surface of the straw crusher, affecting the heat dissipation of the straw crusher. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a straw crusher with adjustable stubble height, non-cantilever installation of crawlers, and prevention of straw flying.

[0004] To solve the above technical problems, the technical solution of the utility model is: A straw crusher includes a chassis, a power mechanism arranged above the chassis, a straw crushing mechanism arranged in front of the chassis, and crawler mechanisms arranged on both sides of the chassis. The power mechanism includes a straw crushing power component for driving the straw crushing mechanism and a walking power component for driving the crawler mechanisms. The driving wheels of the crawler mechanisms are connected to the walking output shaft of the walking power component through a non-cantilever support structure; The straw crushing mechanism includes a front shield and a cutting component. The two shaft ends of the cutting component are rotatably installed inside the lower part of the front shield. One shaft end of the cutting component is connected to the straw crushing power component. The rear end of the front shield is rotatably installed on the chassis through a shield rotation component. A shield lifting component for driving the front shield to swing around the shield rotation component is also arranged between the chassis and the front shield. A row of anti-splash chains that can naturally droop is arranged along the width direction at the front end of the front shield.

[0005] As a preferred technical solution, the non-cantilever support structure includes an inner support plate and an outer support plate that are fixedly connected to each other. The end of the traveling output shaft extends between the inner support plate and the outer support plate, and a driving shaft sleeve is fixedly installed on the outer periphery of the end. The driving shaft sleeve is rotatably connected to the outer support plate through an outer bearing, and the traveling output shaft is rotatably connected to the inner support plate through an inner bearing. The driving wheel is fixedly installed outside the driving shaft sleeve and is located between the inner bearing and the outer bearing.

[0006] As a preferred technical solution, the inner periphery of the driving shaft sleeve is provided with a mounting hole, the end of the traveling output shaft is sleeved in the mounting hole, a circumferential positioning structure is provided between the outer periphery of the traveling output shaft and the inner periphery of the mounting hole, and an axial positioning structure is further provided between the end of the traveling output shaft and the driving shaft sleeve; the circumferential positioning structure includes a keyway one provided on the inner peripheral surface of the mounting hole and a keyway two provided on the outer peripheral surface of the traveling output shaft, and the keyway one and the keyway two are connected by a key; the axial positioning structure includes a positioning shoulder provided on the inner periphery of the driving shaft sleeve and outside the mounting hole, a positioning retaining plate is provided at the end of the traveling output shaft, the positioning retaining plate is fixed to the center of the traveling output shaft by a bolt, and the positioning retaining plate abuts against the end of the traveling output shaft and the positioning shoulder.

[0007] As a preferred technical solution, the shield rotating assembly includes a rotating shaft sleeve fixedly installed on the front shield, rotating shaft seats are fixedly installed outside the two ends of the rotating shaft sleeve on the chassis, the rotating shaft sleeve and the rotating shaft seats are coaxially installed through a rotating shaft, outer positioning sleeves are respectively provided at the two ends of the rotating shaft sleeve, inner positioning sleeves are respectively provided on the rotating shaft seats, and the outer positioning sleeves and the inner positioning sleeves are concentrically installed outside the rotating shaft.

[0008] As a preferred technical solution, the shield lifting assembly includes a hydraulic cylinder, one end of the hydraulic cylinder is connected to the front shield through a hinge support one, and the other end of the hydraulic cylinder is connected to the chassis through a hinge support two.

[0009] As a preferred technical solution, an anti-back-splash vertical net extending upward is further installed at the top of the front shield.

[0010] As a preferred technical solution, the straw crushing power assembly includes a starting battery, an engine and a gearbox. A pulley one is installed on the power shaft of the gearbox. An intermediate shaft coaxially arranged with the hood rotating assembly is rotatably installed on the front hood. A pulley two and a pulley three are respectively installed at both ends of the intermediate shaft. The pulley one and the pulley two are drivingly connected by a belt one. A pulley four is installed at one shaft end of the chopping assembly. The pulley three and the pulley four are drivingly connected by a belt two. A belt tensioning member cooperating with the belt one is further provided on the chassis.

[0011] As a preferred technical solution, the belt tensioning member includes a tensioning swing arm. The bottom end of the tensioning swing arm is rotatably installed on the chassis through a bracket. A tensioning wheel pressing on the surface of the belt one is rotatably installed at the top end of the tensioning swing arm. A tensioning spring wire is provided between the chassis and the tensioning swing arm.

[0012] As a preferred technical solution, the traveling power assembly includes a traveling battery, a traveling motor, a speed reducer, and an extended-range generator drivingly connected to the power shaft of the gearbox. The extended-range generator supplies power to the traveling battery. The output shaft of the speed reducer serves as the traveling output shaft for installing the driving wheel.

[0013] As a preferred technical solution, the chopping assembly includes a chopping shaft rotatably installed on the front hood. One end of the chopping shaft is connected to the straw crushing power assembly. A plurality of chopping moving knives are arranged along the length direction on the outer periphery of the chopping shaft. A plurality of chopping fixed knives staggered with the chopping moving knives are further fixedly installed on the inner surface of the top end of the front hood.

[0014] Due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows: Through various improvements to the transmission straw crusher, a new type of straw crusher is provided; by the combined use of the hood rotating assembly and the hood lifting assembly, the height of the straw crushing mechanism can be adjusted, and the stubble height can be better adjusted; on the basis of the existing traditional cantilever structure, the structure is improved. By adding a driving shaft sleeve and combining internal and external rotating supports, the problem of structural instability easily caused by the traditional cantilever structure is solved. It is improved on the original structure and has the advantages of simple structure, convenient installation, and stable structure; and by adding a splash-proof chain at the front, the straw crushing splash is reduced, providing a good working environment. Description of the Drawings

[0015] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model.

[0016] Figure 1 It is a side view of an embodiment of the present utility model;

[0017] Figure 2 is a schematic diagram of a partial structure of an embodiment of the present utility model;

[0018] Figure 3 is a top view of an embodiment of the present utility model;

[0019] Figure 4 is a schematic diagram of a non - cantilever support structure of an embodiment of the present utility model;

[0020] In the figure: 100 - chassis; 200 - power mechanism; 211 - engine; 212 - gearbox; 213 - pulley one; 214 - intermediate shaft; 215 - pulley two; 216 - pulley three; 217 - pulley four; 218 - tensioning swing arm; 219 - tensioning pulley; 221 - traveling output shaft; 222 - traveling motor; 223 - reducer; 224 - range extender generator; 300 - straw crushing mechanism; 301 - front shield; 302 - cutting assembly; 400 - crawler mechanism; 401 - driving wheel; 402 - driven wheel; 500 - lifting mechanism; 501 - rotating shaft sleeve; 502 - rotating shaft seat; 503 - rotating shaft; 504 - hydraulic cylinder; 505 - hinge support one; 506 - hinge support two; 600 - non - cantilever support structure; 601 - inner support plate; 602 - outer support plate; 603 - driving shaft sleeve; 604 - outer bearing; 605 - inner bearing; 606 - outer bearing seat; 607 - inner bearing seat; 608 - key; 609 - positioning retaining piece; 610 - bolt; 611 - driving wheel mounting plate; 700 - anti - splash chain; 800 - anti - rear - splash vertical net. Detailed implementation manners

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. Undoubtedly, those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the accompanying drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0022] As Figures 1 to 3As shown in the figure, a straw crusher includes a chassis 100, a power mechanism 200, a straw crushing mechanism 300, a crawler mechanism 400, and a lifting mechanism 500. The chassis 100 serves as the supporting base of this mechanism, and other structures are directly or indirectly installed on the chassis 100; the power mechanism 200 is arranged above the chassis 100, the straw crushing mechanism 300 is located in front of the chassis 100, the crawler mechanism 400 is arranged on both sides of the chassis 100. The power mechanism 200 includes a straw crushing power component and a traveling power component. The straw crushing power component is used to drive the straw crushing mechanism 300 to perform rotary straw crushing operations, and the traveling power component is used to drive the crawler mechanism 400 to perform straw crushing and traveling during operations and transfer and movement during non-operations. The lifting mechanism 500 is used to control the height of the straw crushing mechanism 300 to adjust the stubble height.

[0023] To solve the problem of low service life caused by the cantilever installation of the crawler mechanism 400 in the prior art, a non-cantilever support structure 600 is designed in this application. The drive wheel 401 of the crawler mechanism 400 is connected to the traveling output shaft 221 of the traveling power component through the non-cantilever support structure 600. See Figure 4, the non-cantilever support structure 600 includes an inner support plate 601 and an outer support plate 602 that are fixedly connected to each other. The end of the traveling output shaft 221 extends between the inner support plate 601 and the outer support plate 602, and a drive shaft sleeve 603 is fixedly installed on the outer periphery of the end. The drive shaft sleeve 603 is connected to the outer support plate 602 through an outer bearing assembly, and the traveling output shaft 221 is connected to the inner support plate 601 through an inner bearing assembly. The drive wheel 401 is fixedly installed outside the drive shaft sleeve 603 and is located between the inner bearing 605 and the outer bearing 604. The outer bearing assembly includes an outer bearing 604 fixedly installed on the outer periphery of the drive bearing 603, and the outer ring of the outer bearing 604 is installed on the outer support plate 602 through an outer bearing seat 606; the inner bearing assembly includes an inner bearing 605 fixedly installed on the outer periphery of the traveling output shaft 221, and the outer ring of the inner bearing 605 is installed on the inner support plate 601 through an inner bearing seat 607. By adding a drive shaft sleeve 603 to the outer end of the traveling output shaft 221 and using the inner support plate 601 and the outer support plate 602 to respectively rotate and support the traveling output shaft 221 and the drive shaft sleeve 603, the traveling output shaft 221 is no longer a cantilever structure at this time. Its two ends are cooperatively formed by the inner support plate 601 and the outer support plate 602 into a non-cantilever type stable support structure. The drive wheel 401 is fixedly installed outside the drive shaft sleeve 603 and is located at the middle position between the inner support plate 601 and the outer support plate 602. During power transmission, the traveling output shaft 221 drives the drive shaft sleeve 603 and the drive wheel 401 thereon to rotate together, thereby realizing the traveling of the crawler mechanism 400. This device improves the structure on the basis of the existing traditional cantilever structure. By adding a drive shaft sleeve 603 and combining internal and external rotational supports, it solves the problem of structural instability easily caused by the traditional cantilever structure. It makes improvements on the original structure and has the advantages of simple structure, convenient installation, and stable structure.

[0024] The inner circumference of the drive shaft sleeve 603 is provided with a mounting hole, the end of the traveling output shaft 221 is sleeved in the mounting hole, a circumferential positioning structure is provided between the outer circumference of the traveling output shaft 221 and the inner circumference of the mounting hole, and an axial positioning structure is further provided between the end of the traveling output shaft 221 and the drive shaft sleeve 603; the circumferential positioning structure includes a keyway one provided on the inner circumferential surface of the mounting hole and a keyway two provided on the outer circumferential surface of the traveling output shaft 221, and the keyway one and the keyway two are connected by a key 608 to ensure that there is no circumferential rotation between the traveling output shaft 221 and the mounting hole; the axial positioning structure includes a positioning shoulder provided on the inner circumference of the drive shaft sleeve 603 and outside the mounting hole, a positioning washer 609 is provided at the end of the traveling output shaft 221, the positioning washer 609 is fixed to the center of the traveling output shaft 221 by a bolt 610, the positioning washer 609 abuts against the end of the traveling output shaft 221 and the positioning shoulder, and through the cooperation of the positioning washer 609, the bolt 610 and the positioning shoulder, the traveling output shaft 221 and the drive shaft sleeve 603 are axially fixed.

[0025] A drive wheel mounting plate 611 is welded and fixed to the outer circumference of the middle part of the drive shaft sleeve 603, the drive wheel 401 is fixedly connected to the drive wheel mounting plate 611 by bolts, and the installed drive wheel 401 is located at the middle position between the inner support plate 601 and the outer support plate 602.

[0026] The inner support plate 601 and the outer support plate 602 are fixedly connected by studs and bolts. Here, the inner support plate 601 and the outer support plate 602 also serve as the mounting base of the crawler mechanism 400 and can be part of the crawler mechanism 400.

[0027] The crawler mechanism 400 further includes a plurality of driven wheels 402 installed between the inner support plate 601 and the outer support plate 602, and a traveling crawler is installed outside the drive wheel 401 and the plurality of driven wheels 402.

[0028] To solve the problem that the stubble height cannot be adjusted by the straw crushing mechanism 300 in the prior art, the lifting mechanism 500 is designed in this application. The lifting mechanism 500 includes a shield rotation assembly and a shield lifting assembly. The straw crushing mechanism 300 includes a front shield 301 and a shredding assembly 302. The two shaft ends of the shredding assembly 302 are rotatably installed inside the lower part of the front shield 301. One of the shaft ends of the shredding assembly 302 is connected to the straw crushing power assembly. The rear end of the front shield 301 is rotatably installed on the chassis 100 through the shield rotation assembly. The shield lifting assembly is connected between the chassis 100 and the front shield 301 to drive the front shield 301 to swing around the shield rotation assembly, so as to drive the shredding assembly 302 to swing to achieve the purpose of adjusting the stubble height.

[0029] The shield rotation assembly includes a rotating shaft sleeve 501 fixedly installed on the front shield 301. Rotating shaft seats 502 are fixedly installed outside the two ends of the rotating shaft sleeve 501 on the chassis 100. The rotating shaft sleeve 501 and the rotating shaft seats 502 are coaxially installed through a rotating shaft 503. Outer positioning sleeves are respectively arranged at the two ends of the rotating shaft sleeve 501, and inner positioning sleeves are respectively arranged on the rotating shaft seats 502. The outer positioning sleeves and the inner positioning sleeves are concentrically installed outside the rotating shaft 503. The two outer positioning sleeves, the two inner positioning sleeves and the rotating shaft 503 cooperate to realize the concentric installation of the rotating shaft sleeve 501 and the rotating shaft seats 502.

[0030] The shield lifting assembly includes a hydraulic cylinder 504. One end of the hydraulic cylinder 504 is connected to the front shield 301 through a hinge support one 505, and the hinge support one 505 is installed on the top of the front shield 301. The other end of the hydraulic cylinder 504 is connected to the chassis 100 through a hinge support two 506. When the hydraulic cylinder 504 extends, it can drive the front shield 301 to swing downward. When the hydraulic cylinder 504 retracts, it can drive the front shield 301 to swing upward.

[0031] The shredding assembly 302 includes a shredding shaft rotatably installed on the front shield 301. One end of the shredding shaft is connected to the straw crushing power assembly. A plurality of shredding moving knives are arranged along the length direction on the outer periphery of the shredding shaft. The shredding moving knives adopt the commonly used Y-shaped throwing knives in the existing design. A plurality of shredding fixed knives staggered with the shredding moving knives are also fixedly installed on the inner surface of the top end of the front shield 301. When the shredding moving knives rotate for operation, they cooperate with the fixed shredding fixed knives to better achieve fine shredding.

[0032] In order to solve the problem of grass fragments splashing forward in the prior art, the present application designs an anti-splashing chain 700, which is arranged in a row and installed at the front edge of the front shield 301. The anti-splashing chain 700 is arranged in a row along the width direction of the front shield 301 to form a blocking structure in front of the chopping assembly 302. Here, since the anti-splashing chain 700 is a chain structure composed of chain links, the structure has mobile flexibility. When the height of the grass chopping mechanism 300 is low, the anti-splashing chain 700 can also be deformed and mopped adaptively. During operation, the chopping assembly 302 adopts a backward rotation method to perform rotary chopping. After the splashing grass fragments are driven by the chopping assembly 302 to be thrown forward, they just touch the anti-splashing chain 700 and are blocked by the anti-splashing chain 700 to avoid splashing outward. The grass fragments that touch the anti-splashing chain 700 continue to remain in the front shield 301, and multiple grass fragments can be cut.

[0033] In order to further prevent the splashed grass clippings from falling backwards on the surface of the machine, an upwardly extending anti-splash vertical net 800 is also installed on the top of the front shield 301. A small amount of grass clippings splashed out from the front of the anti-splash chain 700 fly upwards and are blocked by the anti-splash vertical net 800 as the machine moves forward. They are accumulated at the anti-splash vertical net 800, which can effectively prevent them from falling onto the machine at the rear and affecting the heat dissipation effect of the machine.

[0034] The grass-chopping power assembly includes a starting battery, an engine 211 and a gearbox 212, a power shaft of the gearbox 212 is provided with a pulley 1 213, an intermediate shaft 214 coaxially arranged with the guard rotating assembly is rotatably provided on the front guard 301, a pulley 2 215 and a pulley 3 216 are provided at both ends of the intermediate shaft 214, the pulley 1 213 and the pulley 2 215 are connected by a belt 1 transmission, and a pulley 4 217 is provided at one shaft end of the chopping assembly 302. The pulley three 216 and the pulley four 217 are connected through the belt two transmission. The chassis 100 is also provided with a belt tensioner used in conjunction with the belt one. The belt tensioner includes a tensioning swing arm 218. The bottom end of the tensioning swing arm 218 is rotatably mounted on the chassis 100 through a bracket. The top end of the tensioning swing arm 218 is rotatably mounted with a tensioning wheel 219 pressed against the surface of the belt one. A tensioning spring pull wire is provided between the chassis 100 and the tensioning swing arm 218.

[0035] A crawler mechanism is provided on the left and right sides of the grass shredder, respectively, so there are two travel power assemblies, which are located on the left and right sides of the machine and are symmetrically arranged. Each crawler mechanism is driven by a travel motor, which is fixed to the chassis. The drive wheel 401 of the crawler mechanism at the rear is connected to the power output shaft of the travel motor through a non-cantilever support structure 600, and the driven shaft on a driven wheel 402 at the front of the crawler mechanism is rotatably connected to the chassis. The travel power assembly includes a travel battery, a travel motor 222, a reducer 223, and a range extender generator 224 that is transmission-connected to the power shaft of the gearbox 212. The range extender generator 224 supplies power to the travel battery, and the output shaft of the reducer 223 is used as the travel output shaft 221 for mounting the drive wheel 401.

[0036] In this embodiment, the starting battery is used as the starting power source of the engine 211, and two traveling batteries are provided, which are used as the power source of the traveling motor 222 respectively. The power of the traveling motor 222 is a combination of a traveling battery and a generator to increase the range, and the continuous working time is longer. In addition, the starting battery and the traveling battery are provided separately to realize different functions, and the arrangement is reasonable, which effectively improves the operation time and service life of the machine.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A grass chopper, comprising a chassis, a power mechanism disposed above the chassis, a grass chopping mechanism disposed in front of the chassis, and a crawler mechanism disposed on both sides of the chassis, wherein the power mechanism comprises a grass chopping power assembly for driving the grass chopping mechanism and a traveling power assembly for driving the crawler mechanism, and is characterized in that: The driving wheel of the crawler mechanism is connected to the walking output shaft of the walking power assembly through a non-cantilever support structure; the grass-chopping mechanism includes a front shield and a chopping assembly, the two shaft ends of the chopping assembly are rotatably installed under the front shield, one shaft end of the chopping assembly is connected to the grass-chopping power assembly, the rear end of the front shield is rotatably installed on the chassis through a shield rotating assembly, and a shield lifting assembly is also provided between the chassis and the front shield for driving the front shield to swing around the shield rotating assembly, and a row of anti-splash chains that can naturally droop are arranged at the front end of the front shield along the width direction.

2. A lawn mower according to claim 1, characterized in that: The non-cantilever support structure includes an inner support plate and an outer support plate fixedly connected to each other, the end of the travel output shaft extends between the inner support plate and the outer support plate, and a drive sleeve is fixedly installed on the outer periphery of the end, the drive sleeve is connected to the outer support plate via an outer bearing assembly, the travel output shaft is connected to the inner support plate via an inner bearing assembly, and the drive wheel is fixedly installed outside the drive sleeve and is located between the inner bearing and the outer bearing.

3. A lawn mower according to claim 2, characterized in that: A mounting hole is provided on the inner circumference of the driving sleeve, and the end of the travel output shaft is sleeved in the mounting hole. A circumferential positioning structure is provided between the outer circumference of the travel output shaft and the inner circumference of the mounting hole, and an axial positioning structure is also provided between the end of the travel output shaft and the driving sleeve; the circumferential positioning structure includes a keyway 1 provided on the inner circumferential surface of the mounting hole and a keyway 2 provided on the outer circumferential surface of the travel output shaft, and the keyway 1 and the keyway 2 are connected by a key; the axial positioning structure includes a positioning shoulder provided on the inner circumference of the driving sleeve and located outside the mounting hole, and a positioning baffle is provided at the end of the travel output shaft, and the positioning baffle is fixed to the center of the travel output shaft by bolts, and the positioning baffle abuts against the end of the travel output shaft and the positioning shoulder.

4. A lawn mower according to claim 1, characterized in that: The shield rotating assembly includes a rotating sleeve fixedly mounted on the front shield, and rotating shaft seats are fixedly mounted on the chassis at both ends of the rotating sleeve, the rotating sleeve and the rotating shaft seat are coaxially mounted through a rotating shaft, outer locating sleeves are respectively provided at both ends of the rotating sleeve, and inner locating sleeves are respectively provided on the rotating shaft seat, and the outer locating sleeves and the inner locating sleeves are concentrically mounted outside the rotating shaft.

5. A lawn mower according to claim 1, characterized in that: The shield lifting assembly comprises a hydraulic cylinder, one end of the hydraulic cylinder is connected to the front shield through a hinge support 1, and the other end of the hydraulic cylinder is connected to the chassis through a hinge support 2.

6. A lawn mower according to claim 1, characterized in that: The top end of the front shield is also provided with a back-splash prevention vertical net extending upward.

7. A lawn mower according to claim 1, characterized in that: The grass-chopping power assembly includes a starting battery, an engine and a gearbox, a power shaft of the gearbox is equipped with a pulley 1, an intermediate shaft coaxially arranged with the guard rotating assembly is rotatably installed on the front guard, and pulleys 2 and 3 are respectively installed at both ends of the intermediate shaft, and pulleys 1 and 2 are connected by belt 1. Pulley 4 is installed at one shaft end of the chopping assembly, and pulleys 3 and 4 are connected by belt 2. A belt tensioner used in conjunction with belt 1 is also provided on the chassis.

8. A lawn mower according to claim 7, characterized in that: The belt tensioner includes a tensioning swing arm, the bottom end of which is rotatably mounted on the chassis via a bracket, the top end of which is rotatably mounted with a tensioning wheel pressed against a surface of the belt, and a tensioning spring pull wire is provided between the chassis and the tensioning swing arm.

9. A lawn mower according to claim 7, characterized in that: The travel power assembly includes a travel battery, a travel motor, a reducer, and a range-extending generator that is transmission-connected to the power shaft of the gearbox. The range-extending generator supplies power to the travel battery, and the output shaft of the reducer serves as the travel output shaft for mounting the drive wheel.

10. The lawn mower according to claim 1, characterized in that: The chopping assembly includes a chopping shaft rotatably mounted on the front shield, one end of the chopping shaft is connected to the grass chopping power assembly, a plurality of chopping moving knives are arranged along the length direction on the outer circumference of the chopping shaft, and a plurality of chopping fixed knives staggered with the chopping moving knives are fixedly mounted on the inner surface of the top end of the front shield.

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