CN116458322B

CN116458322B - Mower

Info

Publication number: CN116458322B
Application number: CN202310522110.3A
Authority: CN
Inventors: 陈建斌; 王哲杰; 陈进
Original assignee: Zhuji Haidao Machinery Co ltd
Current assignee: Zhuji Haidao Machinery Co ltd
Priority date: 2023-05-10
Filing date: 2023-05-10
Publication date: 2023-09-01
Anticipated expiration: 2043-05-10
Also published as: CN116458322A

Abstract

The invention belongs to the field of mowers, and particularly relates to a mowing machine which comprises a guide sleeve, a sliding seat, a ring sleeve A, an internal thread sleeve A, a cutter shaft, a shaft sleeve, a blade, a gear A, a gear B, a rotating shaft A, a grab handle A, power equipment and an exoskeleton mechanism, wherein the arc-shaped sliding seat is in sliding fit in the arc-shaped guide sleeve and has a structure for locking the sliding seat. According to the invention, when small-area lawns are trimmed, the sliding seat drives the blade to move to a certain extent to form a manual sickle structure so as to improve the efficiency of trimming lawns, and when large-area lawns are trimmed, the sliding seat drives the blade to move to a certain extent to form a power mower driven by power equipment so as to reduce the swing amplitude of an operator during mowing and the physical consumption during mowing.

Description

Mower

Technical Field

The invention belongs to the field of mowers, and particularly relates to a mowing machine.

Background

In landscaping, lawns in gardens are often required to be trimmed, and two types of equipment are commonly used for trimming lawns:

unpowered manual sickle. The device is used under the conditions that the physical strength of an operator is abundant and the lawn area is small, and the device is light, so that the efficiency of trimming the small-area lawn is high.

A simple power mower driven by power equipment or an internal combustion engine is structurally characterized in that a blade is arranged at one end of a long rod grab handle, and a power device for driving the blade to rotate is arranged at the other end of the long rod. When in use, the belt is carried on the waist side to cut grass along with the swing of the waist. Compared with a manual sickle, the mowing machine has smaller swing amplitude and labor-saving mowing. But the mowing efficiency of the blade is far less than that of the sickle because the blade is smaller than that of the sickle. Meanwhile, the equipment has a large load, so that an operator cannot operate for a long time, and the mowing efficiency is also affected.

The invention integrates the two types of equipment into a whole, can flexibly switch the two types of use modes according to the area of the lawn, and fully plays the advantages of the unpowered sickle and the powered mower. Meanwhile, the invention also designs an exoskeleton structure which is matched with the mower to reduce the load of an operator, and improves the working efficiency.

The invention designs a mower to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a mower which is realized by adopting the following technical scheme.

A mower comprises a guide sleeve, a slide seat, a ring sleeve A, an inner thread sleeve A, a cutter shaft, a shaft sleeve, a blade, a gear A, a gear B, a rotating shaft A, a grab handle A, power equipment and an exoskeleton mechanism, wherein the arc-shaped slide seat is in sliding fit in the arc-shaped guide sleeve and is provided with a structure for locking the slide seat; a cutter shaft vertically slides in the sliding groove on the sliding seat, and a structure for limiting the vertical downward movement amplitude of the cutter shaft is arranged on the cutter shaft; the cutter shaft is in threaded fit with an internal thread sleeve A rotating in an annular sleeve A on the sliding seat; two arc-shaped blades which are circumferentially separated by 180 degrees and matched with the containing grooves on the sliding seat are arranged on the shaft sleeve which is nested and rotated at the lower end of the cutter shaft; the sliding seat is provided with a structure for locking the blade vertically entering the upper containing groove; the gear A arranged on the shaft sleeve is in transmission fit with the gear B in the guide sleeve, the gear B is in transmission connection with the rotating shaft A in the grab handle A on the guide sleeve, and the rotating shaft A is driven to rotate by power equipment arranged at the tail end of the grab handle A; the grab handle A is provided with a leg exoskeleton mechanism for assisting an operator in bearing.

As a further improvement of the technology, the guide sleeve is provided with a containing groove B matched with the annular sleeve A and a containing groove A matched with the shaft sleeve; a bolt B matched with the sliding seat is screwed in the threaded hole on the guide sleeve; a bolt A which is matched with the blade along the radial direction of the shaft sleeve is screwed in the threaded hole on the sliding seat.

As a further improvement of the technology, a manual torsion wheel is arranged on the internal thread sleeve A; the upper end of the cutter shaft is provided with a limiting block A which is matched with the annular sleeve A to limit the downward movement amplitude of the cutter shaft.

As a further improvement of the technology, the gear C on the shaft where the gear B is positioned is meshed with the gear D in the guide sleeve, the gear D is meshed with the gear E in the guide sleeve, and the gear F on the shaft where the gear E is positioned is meshed with the gear G on the rotating shaft A.

As a further improvement of the technology, the grab handle A is a round rod; the power equipment is provided with a ring sleeve B matched with the tail end of the grab handle A, and an internal thread sleeve B matched with the grab handle A in a threaded manner is nested and rotated outside the ring sleeve B; the inner hexagonal groove on the output shaft of the power equipment is matched with the hexagonal head at the tail end of the rotating shaft A.

As a further improvement of the technology, the grab handle A is a semicircular round rod; the semicircular grab handle B matched with the grab handle A is provided with a ring sleeve D which is in nested fit with the grab handle A, and the grab handle A is provided with a ring sleeve C which is in nested fit with the grab handle B; the rotating shaft B rotating in the grab handle B is in transmission connection with an output shaft of the power equipment arranged on the ring sleeve D, and the inner hexagonal sleeve at the tail end of the rotating shaft B is matched with the hexagonal head at the tail end of the rotating shaft A.

As a further improvement of the technology, the grab handle A is provided with a movable groove A for accommodating the hexagonal head at the tail end of the rotating shaft A and the hexagonal sleeve at the tail end of the rotating shaft B, and the grab handle B is provided with a movable groove B for accommodating the hexagonal head at the tail end of the rotating shaft A and the hexagonal sleeve at the tail end of the rotating shaft B.

As a further improvement of the technology, the exoskeleton mechanism comprises a loop E, a waistband, a rod mechanism A, a pin shaft, a rod mechanism B, a connecting rod, a pedal ring, a volute spring, a joint plate and a binding belt, wherein the loop E is nested on the grab handle A or the grab handle A and the grab handle B which are matched with each other, and the loop E is in spherical hinge connection with a fixed rod A on the waistband; a fixed rod B arranged on the waistband is connected with a rod mechanism A with adjustable length in a spherical hinge manner; the tail end of the rod mechanism A is hinged with the rod mechanism B through a pin shaft to form a joint structure adapting to leg joints, and a vortex spring for aligning, swinging and resetting is arranged between the rod mechanism A and the rod mechanism B; the tail end of the rod mechanism B is in spherical hinge connection with a connecting rod provided with a pedal ring; two joint plates are rotatably matched on the pin shaft, and two binding belts matched with thighs and calves are arranged on the two joint plates; the limiting structure which enables the rod mechanism A and the rod mechanism B to bend reversely along the leg joint in a small amplitude is arranged between the rod mechanism A and the rod mechanism B.

As a further improvement of the technology, the rod mechanism A consists of an outer sleeve A and an inner rod A which are matched by threads; the rod mechanism B consists of an outer sleeve B and an inner rod B which are in threaded fit;

as a further improvement of the technology, the vortex spring is nested on the pin shaft and is positioned in the annular groove on the inner rod B; the inner rod B is provided with a limiting block B matched with the outer sleeve A.

The inner wall of the chute is provided with two guide strips which respectively slide in the two guide grooves on the cutter shaft.

The slide seat is provided with a trapezoidal guide bar which slides in a trapezoidal guide groove on the inner wall of the guide sleeve.

Compared with the traditional mower, the mower has the advantages that when small-area lawns are mowed, the sliding seat drives the blades to move to a certain extent to form a manual sickle structure, so that the efficiency of mowing the lawns is improved, and when large-area lawns are mowed, the sliding seat drives the blades to move to a certain extent to form a power mower driven by the power equipment, so that the swing amplitude of an operator during mowing and the physical consumption in the mowing movement process are reduced. Meanwhile, the external skeleton mechanism matched with a human body is matched with the lawn mower, so that a lawn mower operator can save physical strength, lighten load, prolong the time for continuously trimming the lawn, and further improve the lawn trimming efficiency. The invention has simple structure and better use effect.

Drawings

Fig. 1 is a schematic diagram of two states of the present invention.

Fig. 2 is a schematic cross-sectional view of a transmission structure in a guide sleeve according to the present invention from two angles.

Fig. 3 is a schematic cross-sectional view of a blade positioning into a receiving slot on a carriage.

Fig. 4 is a schematic cross-sectional view of a carriage positioning.

Fig. 5 is a schematic cross-sectional view of a first embodiment of the drive connection of the shaft a to the power plant.

Fig. 6 is a schematic cross-sectional view of a second embodiment of the drive connection of the shaft a to the power plant.

Fig. 7 is a schematic cross-sectional view of the handles a and B in the second embodiment.

Fig. 8 is a schematic cross-sectional view of the guide sleeve and the slide.

Fig. 9 is a schematic cross-sectional view of the exoskeleton mechanism in combination with either grip a or grip a and grip B from two perspectives.

Fig. 10 is a schematic partial cross-sectional view of an exoskeleton mechanism.

Reference numerals in the figures: 1. guide sleeve; 2. a trapezoidal guide groove; 3. a containing groove A; 4. a containing groove B; 5. a slide; 6. a storage groove; 7. a chute; 8. a guide bar; 9. trapezoidal guide bars; 10. a ring sleeve A; 11. an internal thread sleeve A; 12. twisting wheels; 13. a cutter shaft; 14. a guide groove; 15. a limiting block A; 16. a shaft sleeve; 17. a blade; 18. a bolt A; 19. a gear A; 20. a gear B; 21. a gear C; 22. a gear D; 23. a gear E; 24. a gear F; 25. a gear G; 26. a rotating shaft A; 27. a grab handle A; 28. a bolt B; 29. a hexagonal head; 30. an internal thread sleeve B; 31. a loop B; 32. a power plant; 33. an inner hexagonal groove; 34. a loop C; 35. a movable groove A; 37. a grab handle B; 38. a movable groove B; 39. a ring sleeve D; 41. a rotating shaft B; 42. an inner hexagonal sleeve; 43. an exoskeleton mechanism; 44. a loop E; 45. a fixed rod A; 46. a waistband; 47. a fixed rod B; 48. a lever mechanism A; 49. an inner rod A; 50. a jacket A; 51. a pin shaft; 52. a lever mechanism B; 53. a jacket B; 54. an inner rod B; 55. a connecting rod; 56. a pedal ring; 57. a volute spring; 58. a limiting block B; 59. a joint plate; 60. a binding band.

Detailed Description

The drawings are schematic representations of the practice of the invention to facilitate understanding of the principles of operation of the structure. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1 and 2, the cutter comprises a guide sleeve 1, a slide seat 5, a ring sleeve A10, an internal thread sleeve A11, a cutter shaft 13, a shaft sleeve 16, a blade 17, a gear A19, a gear B20, a rotating shaft A26, a grab handle A27, a power device 32 and an exoskeleton mechanism 43, wherein as shown in fig. 1, 2 and 4, the arc-shaped slide seat 5 is in sliding fit with the arc-shaped guide sleeve 1 and has a structure for locking the slide seat 5; as shown in fig. 2, 3 and 8, a cutter shaft 13 vertically slides in a chute 7 on the slide seat 5, and the cutter shaft 13 is provided with a structure for limiting the vertical downward movement amplitude; the cutter shaft 13 is in threaded fit with an internal thread sleeve A11 rotating in a ring sleeve A10 on the slide seat 5; as shown in fig. 1, 3 and 8, two arc-shaped blades 17 which are circumferentially 180 degrees apart and matched with the accommodating grooves 6 on the sliding seat 5 are arranged on a shaft sleeve 16 which is nested and rotated at the lower end of the cutter shaft 13; the slide seat 5 is provided with a structure for locking the blade 17 vertically entering the upper containing groove 6; as shown in fig. 1, 2 and 3, a gear a19 installed on the shaft sleeve 16 is in transmission fit with a gear B20 in the guide sleeve 1, the gear B20 is in transmission connection with a rotating shaft a26 rotating in a grab handle a27 on the guide sleeve 1, and the rotating shaft a26 is driven to rotate by a power device 32 installed at the tail end of the grab handle a 27; the handle A27 is provided with a leg exoskeleton mechanism 43 for assisting the operator in bearing weight.

As shown in fig. 2 and 8, the guide sleeve 1 is provided with a containing groove B4 matched with the annular sleeve A10 and a containing groove A3 matched with the shaft sleeve 16; as shown in fig. 3 and 4, a bolt B28 matched with the sliding seat 5 is screwed in a threaded hole on the guide sleeve 1; a bolt a18 which is engaged with the blade 17 in the radial direction of the boss 16 is screwed into a screw hole in the slide 5.

As shown in fig. 2 and 3, the manual torsion wheel 12 is installed on the internal thread sleeve a 11; the upper end of the cutter shaft 13 is provided with a limiting block A15 which is matched with the annular sleeve A10 to limit the downward movement amplitude of the cutter shaft 13.

As shown in fig. 2, the gear C21 on the shaft where the gear B20 is located is meshed with the gear D22 in the guide sleeve 1, the gear D22 is meshed with the gear E23 in the guide sleeve 1, and the gear F24 on the shaft where the gear E23 is located is meshed with the gear G25 on the rotating shaft a 26.

As shown in fig. 5, the grab handle a27 is a round rod; the power equipment 32 is provided with a loop B31 matched with the tail end of the grab handle A27, and an internal thread sleeve B30 matched with the grab handle A27 in a threaded manner is nested and rotated outside the loop B31; an internal hexagonal groove 33 on the output shaft of the power unit 32 mates with the hex head 29 at the end of the spindle a 26.

As shown in fig. 6 and 7, the grab handle a27 is a semicircular round rod; the semicircular grab handle B37 matched with the grab handle A27 is provided with a ring sleeve D39 nested and matched with the grab handle A27, and the grab handle A27 is provided with a ring sleeve C34 nested and matched with the grab handle B37; the rotating shaft B41 rotating in the grab handle B37 is in transmission connection with the output shaft of the power equipment 32 mounted on the annular sleeve D39, and the inner hexagonal sleeve 42 at the tail end of the rotating shaft B41 is matched with the hexagonal head 29 at the tail end of the rotating shaft A26.

As shown in fig. 6 and 7, the handle a27 has a movable groove a35 for accommodating the hexagonal head 29 at the end of the rotating shaft a26 and the hexagonal socket 42 at the end of the rotating shaft B41, and the handle B37 has a movable groove B38 for accommodating the hexagonal head 29 at the end of the rotating shaft a26 and the hexagonal socket 42 at the end of the rotating shaft B41.

As shown in fig. 9 and 10, the exoskeleton mechanism 43 includes a ring sleeve E44, a waistband 46, a rod mechanism a48, a pin shaft 51, a rod mechanism B52, a connecting rod 55, a pedal ring 56, a volute spring 57, a joint plate 59 and a binding band 60, wherein, as shown in fig. 1, 9 and 10, the ring sleeve E44 is nested on the grab handle a27 or the grab handle a27 and the grab handle B37 which are matched with each other, and the ring sleeve E44 is in spherical hinge connection with a fixed rod a45 on the waistband 46; a fixed rod B47 arranged on the waistband 46 is connected with a rod mechanism A48 with adjustable length in a ball hinge manner; the tail end of the rod mechanism A48 is hinged with the rod mechanism B52 through a pin shaft 51 to form a joint structure adapting to leg joints, and a vortex spring 57 for aligning, swinging and resetting is arranged between the rod mechanism A48 and the rod mechanism B; the tail end of the rod mechanism B52 is in spherical hinge connection with a connecting rod 55 provided with a pedal ring 56; the pin shaft 51 is rotatably matched with two joint plates 59, and two binding bands 60 matched with thighs and calves are arranged on the two joint plates 59; the limiting structure for bending the rod mechanism A48 and the rod mechanism B52 reversely along the leg joint in a small amplitude is arranged between the rod mechanism A48 and the rod mechanism B52.

As shown in fig. 9, the lever mechanism a48 is composed of an outer sleeve a50 and an inner lever a49 which are screw-fitted; the rod mechanism B52 consists of an outer sleeve B53 and an inner rod B54 which are in threaded fit;

as shown in fig. 10, the scroll spring 57 is nested on the pin shaft 51 and is positioned in the ring groove on the inner rod B54; the inner rod B54 is provided with a limiting block B58 matched with the outer sleeve A50.

As shown in fig. 3 and 8, the inner wall of the chute 7 is provided with two guide strips 8, and the two guide strips 8 respectively slide in two guide grooves 14 on the cutter shaft 13.

As shown in fig. 2, 4 and 8, the slide 5 is provided with a trapezoidal guide bar 9, and the trapezoidal guide bar 9 slides in the trapezoidal guide groove 2 on the inner wall of the guide sleeve 1.

As shown in fig. 1, the power plant 32 in the present invention is an electric motor or an internal combustion engine.

The working flow of the invention is as follows: in the initial state, the invention is in an unpowered sickle mode. The volute spring 57 in the exoskeleton mechanism 43 is in a compressed state, the outer sleeve A50 of the rod mechanism A48 is propped against the limiting block on the inner rod B54 of the rod mechanism B52, and the rod mechanism A48 and the rod mechanism B52 are reversely bent along the leg joints in a small amplitude. The gear A19 on the cutter shaft 13 is separated from the gear B20 in the guide sleeve 1, and the distance between the gear A19 and the gear B20 reaches the farthest. One blade 17 is located in the receiving groove 6 on the slide 5 and locked by the bolt a18, the width of the blade 17 located in the receiving groove 6 is larger than the width of the slide 5 and the blade edge horizontally protrudes from the receiving groove 6 on the slide 5. The slide 5 is locked in the guide sleeve 1 by a bolt B28.

When the invention needs to be used for trimming small-area lawns, the waistband 46 is tied and sleeved on the waist of an operator to fix, so that the grab handle A27 or the grab handle A27 and the grab handle B37 are positioned on the waist side, the two binding bands 60 are respectively nested and tightly bound on thighs and calves, and the feet of the operator can enter the pedal ring 56 and prop against the ground and swing the leg joints around the pin shaft 51 through the inner rod A49 and the outer sleeve A50 of the relative rotating rod mechanism A48 and the inner rod B54 and the outer sleeve B53 of the rod mechanism B52, so that the structures on the grab handle A27 and the grab handle B37 are all supported by the exoskeleton mechanism 43.

Then, the initial state of the exoskeleton mechanism 43 is maintained, and the handles A27 or the handles A27 and B37 are gripped by both hands to sweep horizontally and reciprocally, so that the lawn is trimmed in the sickle mode. The locking of the blade 17 in the receiving slot 6 on the carriage 5 can strengthen the blade 17 so that the blade 17 efficiently trims the lawn.

When the invention needs to be used for trimming large-area lawns, firstly, the bolt A18 is unscrewed to release the locking of the blades 17 in the accommodating groove 6 on the sliding seat 5, the torsion wheel 12 on the internal thread sleeve A11 is rotated, the torsion wheel 12 drives the cutter shaft 13 to vertically move downwards to the limit relative to the sliding seat 5 through the internal thread sleeve A11, and the cutter shaft 13 drives the gear A19 and the two blades 17 to synchronously move downwards by a certain amplitude through the shaft sleeve 16, so that the blades 17 are separated from the accommodating groove 6 of the sliding seat 5 downwards.

Then, the bolt B28 is unscrewed to unlock the sliding seat 5 in the guide sleeve 1, the sliding seat 5 is shifted to the limit in the guide sleeve 1, the ring sleeve A10 is positioned in the accommodating groove B4, the shaft sleeve 16 is positioned in the accommodating groove A3 on the guide sleeve 1, and then the position of the sliding seat 5 in the guide sleeve 1 is locked by rotating the bolt B28.

At this time, the gear a19 is engaged with the gear B20 in the guide sleeve 1, the two blades 17 are located directly below the guide sleeve 1, and the axis of the cutter shaft 13 is located in the same vertical plane as the axis of the grip a27 or the grip B37.

If the grab handle A27 is in a round rod shape according to the first scheme, the power equipment 32 drives the shaft sleeve 16 to rotate relative to the cutter shaft 13 through the rotating shaft A26, the gear G25, the gear F24, the gear E23, the gear D22, the gear C21, the gear B20 and the gear A19, and the shaft sleeve 16 drives the two blades 17 to synchronously rotate and trim lawns.

In the pruning process, the handles A27 or the handles A27 and B37 are tightly held by both hands to drive the guide sleeve 1 and the blades 17 to swing along with the waist, and the exoskeleton mechanism 43 always forms auxiliary support for equipment in the swinging process of the handles A27 or the handles A27 and B37, so that the purpose of saving the physical strength is achieved.

In summary, the beneficial effects of the invention are as follows: according to the invention, when small-area lawns are trimmed, the sliding seat 5 drives the blade 17 to move to a certain extent to form a manual sickle structure so as to improve the efficiency of trimming lawns, and when large-area lawns are trimmed, the sliding seat 5 drives the blade 17 to move to a certain extent to form a power mower driven by the power equipment 32 so as to reduce the swing amplitude of an operator during mowing and the physical consumption during mowing movement. Meanwhile, the exoskeleton mechanism 43 matched with a human body is matched with the lawn mower, so that a lawn mower operator can save physical strength, lighten load, prolong the time of continuously trimming the lawn, and further improve the lawn trimming efficiency.

Claims

1. A mower, characterized in that: the tool comprises a guide sleeve, a sliding seat, a ring sleeve A, an internal thread sleeve A, a cutter shaft, a shaft sleeve, a blade, a gear A, a gear B, a rotating shaft A, a grab handle A, power equipment and an exoskeleton mechanism, wherein the arc-shaped sliding seat is in sliding fit in the arc-shaped guide sleeve and has a structure for locking the sliding seat; a cutter shaft vertically slides in the sliding groove on the sliding seat, and a structure for limiting the vertical downward movement amplitude of the cutter shaft is arranged on the cutter shaft; the cutter shaft is in threaded fit with an internal thread sleeve A rotating in an annular sleeve A on the sliding seat; two arc-shaped blades which are circumferentially separated by 180 degrees and matched with the containing grooves on the sliding seat are arranged on the shaft sleeve which is nested and rotated at the lower end of the cutter shaft; the sliding seat is provided with a structure for locking the blade vertically entering the upper containing groove; the gear A arranged on the shaft sleeve is in transmission fit with the gear B in the guide sleeve, the gear B is in transmission connection with the rotating shaft A in the grab handle A on the guide sleeve, and the rotating shaft A is driven to rotate by power equipment arranged at the tail end of the grab handle A; the grab handle A is provided with a leg exoskeleton mechanism for assisting an operator in bearing;

the grab handle A is a semicircular round rod; the semicircular grab handle B matched with the grab handle A is provided with a ring sleeve D which is in nested fit with the grab handle A, and the grab handle A is provided with a ring sleeve C which is in nested fit with the grab handle B; the rotating shaft B rotating in the grab handle B is in transmission connection with an output shaft of the power equipment arranged on the ring sleeve D, and the inner hexagonal sleeve at the tail end of the rotating shaft B is matched with the hexagonal head at the tail end of the rotating shaft A;

the exoskeleton mechanism comprises a loop E, a waistband, a rod mechanism A, a pin shaft, a rod mechanism B, a connecting rod, a pedal ring, a volute spring, a joint plate and a binding belt, wherein the loop E is nested on the grab handle A or the grab handle A and the grab handle B which are matched with each other, and the loop E is in spherical hinge connection with a fixed rod A on the waistband; a fixed rod B arranged on the waistband is connected with a rod mechanism A with adjustable length in a spherical hinge manner; the tail end of the rod mechanism A is hinged with the rod mechanism B through a pin shaft to form a joint structure adapting to leg joints, and a vortex spring for aligning, swinging and resetting is arranged between the rod mechanism A and the rod mechanism B; the tail end of the rod mechanism B is in spherical hinge connection with a connecting rod provided with a pedal ring; two joint plates are rotatably matched on the pin shaft, and two binding belts matched with thighs and calves are arranged on the two joint plates; the limiting structure which enables the rod mechanism A and the rod mechanism B to bend reversely along the leg joint in a small amplitude is arranged between the rod mechanism A and the rod mechanism B.

2. A lawnmower as claimed in claim 1 wherein: the guide sleeve is provided with an accommodating groove B matched with the annular sleeve A and an accommodating groove A matched with the shaft sleeve; a bolt B matched with the sliding seat is screwed in the threaded hole on the guide sleeve; a bolt A which is matched with the blade along the radial direction of the shaft sleeve is screwed in the threaded hole on the sliding seat.

3. A lawnmower as claimed in claim 1 wherein: a manual torsion wheel is arranged on the internal thread sleeve A; the upper end of the cutter shaft is provided with a limiting block A which is matched with the annular sleeve A to limit the downward movement amplitude of the cutter shaft.

4. A lawnmower as claimed in claim 1 wherein: the gear C on the shaft where the gear B is positioned is meshed with the gear D in the guide sleeve, the gear D is meshed with the gear E in the guide sleeve, and the gear F on the shaft where the gear E is positioned is meshed with the gear G on the rotating shaft A.

5. A lawnmower as claimed in claim 1 wherein: the grab handle A is provided with a movable groove A for accommodating the hexagonal head at the tail end of the rotating shaft A and the hexagonal sleeve at the tail end of the rotating shaft B, and the grab handle B is provided with a movable groove B for accommodating the hexagonal head at the tail end of the rotating shaft A and the hexagonal sleeve at the tail end of the rotating shaft B.

6. A lawnmower as claimed in claim 1 wherein: the rod mechanism A consists of an outer sleeve A and an inner rod A which are in threaded fit; the rod mechanism B consists of an outer sleeve B and an inner rod B which are in threaded fit.

7. A lawnmower as claimed in claim 6 wherein: the vortex spring is nested on the pin shaft and is positioned in the annular groove on the inner rod B; the inner rod B is provided with a limiting block B matched with the outer sleeve A.