CN212087025U - Planetary multifunctional lawn trimmer - Google Patents

Abstract

The utility model relates to a garden equipment, especially planetary multi-functional lawn trimmer. The front end of the frame is provided with a fixed mount hinged with the frame, the fixed mount comprises a swinging frame and a frame body at the front end of the swinging frame, the lower part of the frame body is provided with a supporting wheel, and a lifting mechanism is arranged between the swinging frame and the frame; the two ends of the frame body are respectively provided with a swing arm hinged with the frame body, a swing oil cylinder is arranged between the frame body and the swing arms, the front ends of the two swing arms are respectively hinged with the connecting rods, and the front ends of the two connecting rods are hinged; the front ends of the swing arms are respectively provided with a cutting and raking device, the cutting and raking device comprises a differential mechanism with a planetary wheel structure, a planetary carrier of the differential mechanism is fixedly connected with the swing arms, an inner gear of the differential mechanism is provided with a raking rake, and a driving shaft of a sun gear of the differential mechanism is provided with a first pruning knife; the front end of the connecting rod is provided with a second pruning knife; the differential and the second pruning knife are respectively driven by a power device; a conveying and collecting device is arranged between the fixed frame and the rear part of the frame. The utility model discloses to mow, hug the grass bits and accomodate the grass bits operation and accomplish simultaneously, the operating efficiency is high.

Description

Planetary multifunctional lawn trimmer

Technical Field

The utility model relates to a garden equipment, especially a planetary multi-functional lawn trimmer.

Background

With the increasing importance of people on ecological civilization construction, the phenomenon of planting lawns to green the environment is increasingly widespread. In order to maintain the aesthetic appearance of a lawn, people need to regularly trim the lawn with a lawn trimming device.

The traditional manual operation of trimming equipment (such as backpack type and push type) is used for trimming large-area lawns, so that the efficiency is low, the lawn trimming flatness is poor, and operators are easy to fatigue. In the existing lawn trimmer, the cut grass scraps are often scattered among the lawns in the grass cutting operation process and cannot be recycled, so that the working efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem and provides a planetary multi-functional lawn trimmer that operating efficiency is high.

The utility model provides a technical scheme that its technical problem adopted is:

a planetary multifunctional lawn trimmer comprises a trimmer body and a trimmer cutter, wherein the trimmer body comprises a frame and a trimmer head arranged at the front end of the frame, the front end of the frame is provided with a fixed frame hinged with the frame, the fixed frame comprises a swing frame and a frame body at the front end of the swing frame, the lower part of the frame body is provided with a supporting wheel, and a lifting mechanism is arranged between the swing frame and the frame; the two ends of the frame body are respectively provided with a swing arm hinged with the frame body, a swing oil cylinder is arranged between the frame body and the swing arms, the front ends of the two swing arms are respectively hinged with the connecting rods, and the front ends of the two connecting rods are hinged; the front ends of the swing arms are respectively provided with a cutting and raking device, the cutting and raking device comprises a differential mechanism with a planetary wheel structure, a planetary carrier of the differential mechanism is fixedly connected with the swing arms, an inner gear of the differential mechanism is provided with a raking rake, and a driving shaft of a sun gear of the differential mechanism is provided with a first pruning knife; the front end of the connecting rod is provided with a mowing disc; the differential and the mowing disc are respectively driven by a power device; a conveying and collecting device is arranged between the fixed frame and the rear part of the frame.

Adopt above-mentioned technical scheme the utility model discloses compare with prior art, beneficial effect is:

the width and the height of the lawn to be trimmed can be adjusted, the trimming effect is good, and the practicability is strong; the grass cutting and raking machine has the advantages that grass cutting, raking and storage operations are automatically completed simultaneously, operation efficiency is high, and the grass cutting and raking machine has the advantages of being convenient to operate, saving time and labor and being wide in application.

Further, the utility model discloses an optimization scheme can be:

the lifting mechanism comprises a frame, a swing frame and a lifting oil cylinder, wherein the swing frame is a rectangular welding component and comprises support frames and a swing shaft, the two support frames are longitudinally arranged, the swing shaft is arranged at the rear end of each support frame, two ends of the swing shaft are respectively hinged with longitudinal beams of the frame, the lifting oil cylinder is respectively arranged on two sides of the bottom of the swing frame, a cylinder body of the lifting oil cylinder is hinged with a lifting oil cylinder seat, the lifting oil cylinder seat is fixedly connected with a cross beam of the frame, and a piston rod of the lifting oil cylinder is hinged with the support frames of the swing frame.

The frame body is a U-shaped welding component, the two sides of the middle part of the bottom plate of the frame body are provided with swing oil cylinder seats, the two sides of the frame body are provided with vertical side plates, the outer sides of the side plates are provided with swing arm seats and return spring lugs, and the swing arm seats are positioned at the rear parts of the return spring lugs; the rear end of the swing arm is hinged to a swing arm seat, a swing arm lug and a spring seat are arranged on the inner side and the outer side of the rear end of the swing arm respectively, a cylinder body of the swing oil cylinder is hinged to the swing oil cylinder seat, a piston rod of the swing oil cylinder is hinged to the swing arm lug, one end of a return spring is connected with the return spring lug, and the other end of the return spring is connected with the spring seat.

The driving device comprises a first hydraulic motor and a second hydraulic motor, wherein a shell of the first hydraulic motor is fixedly connected with the swing arm, and an output shaft of the first hydraulic motor is connected with a driving shaft of a sun gear of the differential mechanism; the shell of the second hydraulic motor is fixedly connected with the connecting rod, the output shaft of the second hydraulic motor is connected with the mowing disc, the mowing disc comprises a cutter shaft and a second pruning knife arranged at the lower end of the cutter shaft, and the output shaft of the second hydraulic motor is connected with the cutter shaft.

The rake comprises a rake frame, a support rod and a rake rod, wherein the annular rake frame is fixedly connected with the inner gear, the support rod is radially arranged on the outer circumference of the rake frame, and the outer end of the support rod is provided with a plurality of vertical rake rods.

The lower end planes of the rake rods are arranged obliquely relative to the horizontal plane, and the inclination angle is 1.5-3 degrees.

The conveying and collecting device comprises a swing rod, a support rod, a buffer device, a suction head ear, a suction pipe, a pipe support and a containing box, wherein the suction head is arranged below the frame body, the suction head is of a flat box body structure with an opening at the bottom of the front end, the rear end of the suction head is communicated with one end of the suction pipe, the other end of the suction pipe is communicated with the containing box, the containing box is arranged at the rear part of the frame, and the containing box is provided with a negative pressure device; suction head ears are respectively arranged on two sides of the front end of the suction head, one ends of the two swing rods are respectively hinged with the suction head ears, and the other ends of the two swing rods are respectively hinged with a suction head seat at the bottom of the frame body; two sides of the rear end of the suction head are fixedly connected with one ends of the two supporting rods respectively, and the other ends of the two supporting rods are hinged with the suction head seat.

The buffering device comprises a buffering spring, a fixing plate, a bolt and a nut, wherein an outward extending supporting rod lug is arranged on the outer side of the rear end of the supporting rod, the buffering spring is arranged on the upper portion of the supporting rod lug, the transverse fixing plate is arranged on the upper portion of the spring, the fixing plate is fixedly connected with the supporting frame, and a bolt penetrating through the buffering spring is arranged between the fixing plate and the supporting rod lug.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

fig. 2 is a schematic view of a vehicle body structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of the upper portion of the fixing frame structure according to the embodiment of the present invention;

fig. 4 is a schematic view of the bottom of the fixing frame structure according to the embodiment of the present invention;

fig. 5 is a schematic structural view of a robot arm according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a conveying device according to an embodiment of the present invention;

FIG. 7 is a schematic view of the connection between the suction pipe and the frame of the conveying device according to the embodiment of the present invention;

fig. 8 is a schematic structural view of a buffering device according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a cutting and raking device according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a differential according to an embodiment of the present invention;

fig. 11 is a schematic view of a mowing disc structure according to an embodiment of the present invention.

In the figure: a vehicle body 1; a mechanical arm 2; a grass cutting and raking device 3; a mowing disc 4; a fixed mount 5; a conveying and collecting device 6; a support wheel 7; a vehicle head 11; a frame 12; a storage box 13; a negative pressure device 131; a swing arm 21; a swing arm ear 211; a spring seat 212; a connecting rod 22; a swing cylinder 23; a cylinder 231; a piston rod 232; a return spring 24; first trimming blade 31; a rake 32; a differential 33; a sun gear 331; the planet wheels 332; an internal gear 333; a carrier 334; a first hydraulic motor 335; a drive shaft 336; a rake rack 337; a planetary gear shaft 338; second trimming blade 41; the second hydraulic motor 42; a cutter shaft 43; a frame body 51; a swing cylinder block 52; a swing arm base 53; a return spring ear 54; a suction head base 55; a swing frame 56; a supporting wheel seat 57; a lift cylinder 58; a lift cylinder base 59; a swing shaft 561; a support 562; a swing link 61; a strut 62; a strut ear 621; the damper 63 damps the spring; 631; a fixed plate 632; bolts 633; a nut 634; a suction head 64; a suction head ear 65; a suction pipe 66; a tube holder 67.

Detailed Description

The present invention will be further described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1 and 2, the present embodiment is a planetary multifunctional lawn mower, which is composed of a vehicle body 1, a mechanical arm 2, a cutting and raking device 3, a mowing disc 4, a fixing frame 5, a conveying and collecting device 6, a supporting wheel 7 and the like. The vehicle body 1 comprises a vehicle head 11, a vehicle frame 12, a containing box 13, wheels 14 and the like, wherein the vehicle frame 12 is a welding component, the wheels 14 are installed on the lower portion of the vehicle frame 12, the vehicle head 11 is installed on the upper portion of the front end of the vehicle frame 12, the containing box 13 is installed on the upper portion of the rear end of the vehicle frame 12, a negative pressure device 131 communicated with the containing box 13 is arranged on the upper portion of the containing box 13, the negative pressure device 131 is a fan, the fan is driven by a motor, the motor is electrically connected with a control system, and the negative.

The front end of the frame 12 is provided with a fixed mount 5 (shown in fig. 3 and 4), the fixed mount 5 is composed of a frame body 51, a swing frame 56 and the like, a supporting wheel 7 is installed below the frame body 51, the supporting wheel 7 is installed at the lower part of an inverted U-shaped wheel carrier, a vertical lead screw is welded at the upper end of the wheel carrier, a nut is welded on the frame body 51, the lead screw is matched with the nut, the height of the supporting wheel 7 can be adjusted, and the supporting wheel 7 supports the dead weight of the mechanical arm 2, the grass cutting and raking device 3, the grass cutting disc 4 and the like, so that the supporting wheel is stably. The swing frame 56 is a rectangular welding component, the swing frame 56 is composed of support frames 562 and a swing shaft 561, the two support frames 562 are longitudinally arranged, the cross section of each support frame 562 is L-shaped, the rear ends of the two support frames 562 are welded with the transverse swing shaft 561, and two ends of the swing shaft 561 are respectively hinged with longitudinal beams on two sides of the frame 12. A lifting mechanism is arranged between the swing frame 56 and the frame 12 and consists of the frame 12, the swing frame 56, a lifting oil cylinder 58 and the like, the lifting oil cylinder 58 is respectively arranged on two sides of the bottom of the swing frame 56, the body of the lifting oil cylinder 58 is hinged with a lifting oil cylinder seat 59, the lifting oil cylinder seat 59 is welded with a cross beam of the frame 12, and the piston rod of the lifting oil cylinder 58 is hinged with a support frame 562 through a hinge seat and a pin shaft.

The frame body 51 is transversely welded at the front end of the swing frame 56, the frame body 51 is a U-shaped welding component (shown in fig. 5), the swing cylinder bases 52 are respectively welded at two sides of the middle part of the bottom plate of the frame body 51, vertical side plates are welded at two ends of the bottom plate of the frame body 51, the swing arm base 53 and the return spring lug 54 are welded on the outer side surface of each side plate, the return spring lug 54 is of a rectangular frame structure, and the swing arm base 53 is located at the rear part of the return spring lug 54. The front portion of support body 51 is equipped with arm 2, and arm 2 comprises swing arm 21 and connecting rod 22 etc. swing arm 21 is the structure, and the rear end of two swing arms 21 is articulated through the round pin axle with two swing arm seats 53 respectively, and the front end of swing arm 21 is equipped with the seat hole, and the front end of two swing arms 21 is articulated with the rear end of two connecting rods 22 respectively, and the front end of two connecting rods 22 is equipped with otic placode and U-shaped seat respectively, and otic placode and U-shaped seat are articulated. The inner side of the rear end of the swing arm 21 is welded with a swing arm lug 211, the outer side of the rear end of the swing arm 21 is welded with a spring seat 212, a cylinder body 231 of the swing oil cylinder 23 is hinged with the swing oil cylinder seat 52, and a piston rod 232 of the swing oil cylinder 23 is hinged with the swing arm lug 211. One end of the return spring 24 is connected to the return spring ear 54 and the other end of the return spring 24 is connected to the spring seat 212. Under the action of the swing oil cylinder 23 and the return spring 24, the swing arm 21 drives the connecting rod 21 to adjust the transverse angle together, so that the mowing width is adjusted.

The cutting and raking devices 3 (shown in fig. 9, 10 and 11) are respectively installed in seat holes at the front ends of the two swing arms 21, and each cutting and raking device 3 comprises a first trimming blade 31, a raking rake 32, a differential 33, a first motor 335, a driving shaft 336 and the like. The differential 33 is of a planetary gear structure, and is composed of a sun gear 331, a planetary gear 332, an internal gear 333, and a planet carrier 334, wherein the sun gear 331 is engaged with the planetary gear 332, the planetary gear 332 is engaged with the internal gear 333, the planetary gear 332 is connected with a planetary gear shaft 338 through a key, and the planetary gear shaft 338 is connected with the planet carrier 334 through a revolute pair. The planet carrier 334 is bolted to the seat hole of the swing arm 21, the first motor 335 is disposed above the differential 33, and the housing of the first motor 335 is bolted to the seat hole of the swing arm 21. The sun gear 331 is connected with the vertical driving shaft 336 through a key, the upper end of the driving shaft 336 is connected with the output shaft of the first motor 335, the lower end of the driving shaft 336 is provided with the transverse first pruning knife 31, and the first pruning knife 31 is in a straight shape.

Differential mechanism 33's internal gear 333 is connected with raking rake 32, and raking rake 32 comprises raking frame 337, bracing piece 339 and raking pole 340, and raking frame 337 is the ring shape, and it is connected with internal gear 332, and the outer circumference of raking frame 337 is radially installed to circular bracing piece 339, and a plurality of vertical raking poles 340 are installed to the outer end of bracing piece 339, and the upper end and the bracing piece 339 fixed connection of raking pole 340. The differential 33 enables high speed rotation of the first trimming blade 31 and low speed rotation of the rake 32. The plane that the lower extreme of the pole 340 that rakes of a plurality of bracing pieces 339 constitutes sets up for the horizontal plane slope, and inclination is 1.5 degrees ~ 3 degrees, has guaranteed to rake 32 lower extreme to be higher than the grass bits plane near 1 width central line one side of automobile body, and the rake 32 lower extreme of opposite side is less than the grass bits plane, realizes raking near automobile body width central line with the grass bits.

A vertical cutter shaft 43 is installed in a hinged hole at the front end of each connecting rod 22, a transverse second trimming cutter 41 is installed at the lower end of each cutter shaft 43, the cutter shafts 43 are driven by a second hydraulic motor 42, a shell of the second hydraulic motor 42 is connected with the connecting rods 22 through bolts, an output shaft of the second hydraulic motor 42 is connected with the cutter shafts 42, the second trimming cutters 41 are in a straight line shape, and the length of each second trimming cutter 41 is smaller than that of each first trimming cutter. When the lawn mower works, the second hydraulic motor 42 drives the second trimming blade 41 to rotate at a high speed, the second hydraulic motor 42 and the second trimming blade 41 are adjusted in position along with the connecting rod 22, and the lawn mower can trim the missed lawn of the cutting and raking device 3.

The conveying and collecting device 6 comprises a swing rod 61, a support rod 62, a buffer device 63, a suction head 64, a suction head ear 65, a suction pipe 66, a pipe bracket 67, a containing box 13 and the like, wherein the suction head 64 is arranged below the frame body 51, the suction head 64 is of a box body structure with the front end opened at the lower part, the rear end of the suction head 64 is communicated with one end of the suction pipe 66, the other end of the suction pipe 66 is communicated with the containing box 13, the containing box 13 is provided with a negative pressure device 131, and the suction pipe 66 is fixed on the frame 12 through the pipe bracket. Two sides of the front end of the suction head 64 are respectively provided with a suction head ear 65, one end of the swing rod 61 is hinged with the suction head ear 65, and the other end of the swing rod 61 is hinged with the suction head seat 55 at the bottom of the frame body 51. The two sides of the rear end of the suction head 64 are respectively welded with one end of the supporting rod 62, and the other end of the supporting rod 62 is hinged with the suction head seat 55. Carry collection device 6 and can realize the high automatically regulated of suction head 64, make suction head 64 adapt to the meadow of unevenness, realize accomodating the automatic containing of ground grass bits of concentrating in containing box 13. The buffer device 63 comprises a buffer spring 631, a fixing plate 632, a bolt 633, a nut 634 and the like, an outward-extending supporting rod ear 621 is arranged on the outer side of the rear end of the supporting rod 62, the buffer spring 631 is mounted on the upper portion of the supporting rod ear 621, the transverse fixing plate 632 is mounted on the upper portion of the buffer spring 631, the fixing plate 632 is welded with supporting frames 562 on two sides, the bolt 633 penetrating through the buffer spring is mounted between the fixing plate 631 and the supporting rod ear 621, and the nut 634 is mounted on the bolt 633.

The swing cylinder 23, the lift cylinder 58, the first hydraulic motor 335 and the second hydraulic motor 42 are respectively in communication with the hydraulic valve block through hydraulic lines.

The working principle of the embodiment is as follows: before the lawn mower is used for mowing, the fixed frame 5 swings under the driving of the lifting oil cylinder 58, the mechanical arm 2 connected with the fixed frame is swung to a proper height, the height of the supporting wheel 7 is manually adjusted according to the leveling degree of a lawn, the nut 635 of the buffer device 63 is rotated, and the height of the suction head 64 from the ground is adjusted. In the process of mowing, the swing oil cylinder 23 is operated at any time according to the size of the lawn, the swing arm 21 and the connecting rod 22 are enabled to swing in a reciprocating mode under the combined action of the return spring 24, the cutting raking devices 3 and the mowing disc 4 connected with the swing arm are driven to adjust the positions, the mowing width is adjusted, and when the distance between the two cutting raking devices 3 is large, the mowing disc 4 finishes trimming the lawn with the missing part in the middle; the differential mechanism 33 is driven by a first hydraulic motor 335 of the cutting and raking device 3, the differential mechanism 33 drives the raking rake 32 and the first trimming blade 31 to rotate at different speeds, the raking rake 32 concentrates grass scraps to the middle of the width of the vehicle body while the first trimming blade 31 performs mowing, a grass scrap belt is formed, and the suction head 64 arranged at the middle moves forward along with the vehicle body and is used for containing the grass scraps in the containing box 13 through the suction pipe 66 under the action of the negative pressure device 131. After the mowing operation is finished, the fixing frame 5 swings under the driving of the lifting oil cylinder 58, and the mechanical arm 2, the mowing and raking device 3 and the mowing disc 4 connected with the fixing frame are collected at the front end of the vehicle body, so that the mowing vehicle can conveniently run on a road.

The above description is only a preferred and practical embodiment of the present invention, and not intended to limit the scope of the present invention, and all structural equivalents made by using the contents of the specification and drawings are included in the scope of the present invention.

Claims (8)

1. The utility model provides a planetary multi-functional lawn trimmer, includes the automobile body, the pruning sword, the automobile body includes the frame and arranges the locomotive of frame front end in, its characterized in that: the front end of the frame is provided with a fixed mount hinged with the frame, the fixed mount comprises a swinging frame and a frame body at the front end of the swinging frame, the lower part of the frame body is provided with a supporting wheel, and a lifting mechanism is arranged between the swinging frame and the frame; the two ends of the frame body are respectively provided with a swing arm hinged with the frame body, a swing oil cylinder is arranged between the frame body and the swing arms, the front ends of the two swing arms are respectively hinged with the connecting rods, and the front ends of the two connecting rods are hinged; the front ends of the swing arms are respectively provided with a cutting and raking device, the cutting and raking device comprises a differential mechanism with a planetary wheel structure, a planetary carrier of the differential mechanism is fixedly connected with the swing arms, an inner gear of the differential mechanism is provided with a raking rake, and a driving shaft of a sun gear of the differential mechanism is provided with a first pruning knife; the front end of the connecting rod is provided with a second pruning knife; the differential and the second pruning knife are respectively driven by a power device; a conveying and collecting device is arranged between the fixed frame and the rear part of the frame.

2. The planetary multi-function lawn mower of claim 1, wherein: the lifting mechanism comprises a frame, a swing frame and a lifting oil cylinder, wherein the swing frame is a rectangular welding component and comprises support frames and a swing shaft, the two support frames are longitudinally arranged, the swing shaft is arranged at the rear end of each support frame, two ends of the swing shaft are respectively hinged with longitudinal beams of the frame, the lifting oil cylinder is respectively arranged on two sides of the bottom of the swing frame, a cylinder body of the lifting oil cylinder is hinged with a lifting oil cylinder seat, the lifting oil cylinder seat is fixedly connected with a cross beam of the frame, and a piston rod of the lifting oil cylinder is hinged with the support frames of the swing frame.

3. The planetary multi-function lawn mower of claim 1, wherein: the frame body is a U-shaped welding component, the two sides of the middle part of the bottom plate of the frame body are provided with swing oil cylinder seats, the two sides of the frame body are provided with vertical side plates, the outer sides of the side plates are provided with swing arm seats and return spring lugs, and the swing arm seats are positioned at the rear parts of the return spring lugs; the rear end of the swing arm is hinged to a swing arm seat, a swing arm lug and a spring seat are arranged on the inner side and the outer side of the rear end of the swing arm respectively, a cylinder body of the swing oil cylinder is hinged to the swing oil cylinder seat, a piston rod of the swing oil cylinder is hinged to the swing arm lug, one end of a return spring is connected with the return spring lug, and the other end of the return spring is connected with the spring seat.

4. The planetary multi-function lawn mower of claim 1, wherein: the driving device comprises a first hydraulic motor and a second hydraulic motor, wherein a shell of the first hydraulic motor is fixedly connected with the swing arm, and an output shaft of the first hydraulic motor is connected with a driving shaft of a sun gear of the differential mechanism; the shell of the second hydraulic motor is fixedly connected with the connecting rod, the output shaft of the second hydraulic motor is connected with the mowing disc, the mowing disc comprises a cutter shaft and a second pruning knife arranged at the lower end of the cutter shaft, and the output shaft of the second hydraulic motor is connected with the cutter shaft.

5. The planetary multi-function lawn mower of claim 1, wherein: the rake comprises a rake frame, a support rod and a rake rod, wherein the annular rake frame is fixedly connected with the inner gear, the support rod is radially arranged on the outer circumference of the rake frame, and the outer end of the support rod is provided with a plurality of vertical rake rods.

6. The planetary multi-function lawn mower of claim 5, wherein: the lower end planes of the rake rods are arranged obliquely relative to the horizontal plane, and the inclination angle is 1.5-3 degrees.

7. The planetary multi-function lawn mower of claim 1, wherein: the conveying and collecting device comprises a swing rod, a support rod, a buffer device, a suction head ear, a suction pipe, a pipe support and a containing box, wherein the suction head is arranged below the frame body, the suction head is of a flat box body structure with an opening at the bottom of the front end, the rear end of the suction head is communicated with one end of the suction pipe, the other end of the suction pipe is communicated with the containing box, the containing box is arranged at the rear part of the frame, and the containing box is provided with a negative pressure device; suction head ears are respectively arranged on two sides of the front end of the suction head, one ends of the two swing rods are respectively hinged with the suction head ears, and the other ends of the two swing rods are respectively hinged with a suction head seat at the bottom of the frame body; two sides of the rear end of the suction head are fixedly connected with one ends of the two supporting rods respectively, and the other ends of the two supporting rods are hinged with the suction head seat.

8. The planetary multi-function lawn mower of claim 7, wherein: the buffer device comprises a buffer spring, a fixing plate, a bolt and a nut, an outward extending supporting rod lug is arranged on the outer side of the rear end of the supporting rod, the buffer spring is arranged on the upper portion of the supporting rod lug, the transverse fixing plate is arranged on the upper portion of the spring, the fixing plate is fixedly connected with the supporting frame, and a bolt penetrating through the buffer spring is arranged between the fixing plate and the supporting rod lug.

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