CN115443796A

CN115443796A - Trimming machine for garden lawn

Info

Publication number: CN115443796A
Application number: CN202211075149.7A
Authority: CN
Inventors: 王爱爱
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-03
Filing date: 2022-09-03
Publication date: 2022-12-09

Abstract

The invention discloses a pruning machine for a garden lawn, and belongs to the technical field of greening equipment. A trimming machine for garden lawns, includes the casing, still includes: the cutting machine comprises side plates welded with a machine shell, wherein an L-shaped supporting seat is welded between the side plates on two sides of the side plates, the L-shaped supporting seat is connected with an L-shaped cutting frame in a sliding mode through a lifting assembly, an upper blade is connected in the L-shaped cutting frame in a sliding mode, fixed blocks are symmetrically arranged on the upper blade, a hollow pipe is connected between the symmetrical fixed blocks, and a plurality of nozzles are arranged on the hollow pipe at equal intervals; install the first air bag seat on one side curb plate, when the inflator extrusion air, but partial air makes the first air bag seat intermittent type formula admit air and give vent to anger and realize the inflation or the shrink of air bag face, when the inflation of admitting air of first air bag seat, make the actuating lever pass through the fixed block and drive the blade and slide to one side in L shape cutting frame, when the first air bag seat is given vent to anger and is contracted, the air bag face indent makes the actuating lever pass through the fixed block and drives the blade and reset to this satisfies the required power of pruning lawn.

Description

Trimming machine for garden lawn

Technical Field

The invention relates to the technical field of greening equipment, in particular to a pruning machine for a garden lawn.

Background

Lawn mowers are also known as weed trimmers, lawnmowers, and the like. The lawn trimmer is a mechanical tool for trimming lawns, vegetations and the like, saves the operation time of weeders and reduces a large amount of manpower resources.

With the increase of economy and the development of home gardening, the use of the lawn trimmer is increased. With the increase of the awareness of green and environmental protection of people, the power mowers on the market have more and more problems when used in the garden. For example, the power lawn trimmer is heavy and needs electric power to walk, the trimmer works only by being pushed, power consumption is large, and the walking unit and the trimming unit of the existing trimmer on the market are driven to work through two driving sources basically, so that extra energy consumption is increased, noise is increased, and the life of other people is seriously interfered and influenced.

Disclosure of Invention

The invention aims to solve the problem that in the prior art, the walking unit and the trimming unit are driven to work respectively by two driving sources, so that extra energy consumption is increased, and provides a trimmer for a garden lawn.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a trimming machine for garden lawn, includes that the casing of rectangle notch is seted up to one side, still includes: the cutting device comprises side plates fixedly welded with two sides of a shell, an L-shaped supporting seat welded between the side plates at two sides, an L-shaped cutting frame connected to the L-shaped supporting seat in a sliding mode through a lifting assembly, an upper blade connected to the inside of the L-shaped cutting frame in a sliding mode, fixed blocks symmetrically installed on the upper blade, a hollow pipe connected between the fixed blocks symmetrically, and a plurality of nozzles installed on the hollow pipe at equal intervals; the first air bag seat is arranged on the side plate on one side, and a driving rod is arranged between the first air bag seat and the fixing block on the same side; the inflator is installed in the casing, the air supply assembly is connected to the inflator in a sliding mode, a first air inlet pipe is connected between the inflator and the first air bag seat, and an air inlet branch pipe is connected between the inflator and the hollow pipe.

In order to reduce the manpower and promote, alleviate the labour, provide the driving source for the start-up of device simultaneously, preferably, the symmetry rotate between the curb plate and be connected with the dwang, coaxial arrangement has first band pulley and second band pulley on the dwang, the both ends of dwang run through the curb plate and install the auxiliary wheel, install the motor on the casing, the output of motor runs through the curb plate and installs the third band pulley, be connected through belt drive between third band pulley and the first band pulley.

For aerifing and the gassing to first gasbag, for the horizontal slip of last blade provides power, furtherly, the air feed subassembly include with casing inner wall fixed connection's first U-shaped seat and second U-shaped seat, the both sides of first U-shaped seat and second U-shaped seat opening part are rotated respectively and are connected with first rotation axis and second rotation axis, install the gear on the first rotation axis, the homonymy gear engagement connects, one side install the fourth band pulley on the second rotation axis, be connected through belt transmission between fourth band pulley and the second band pulley, arbitrary install sleeve and sliding connection the piston rod in the sleeve through link mechanism between first rotation axis and the second rotation axis, first piston plate is installed to telescopic upper end, the upper end of piston rod runs through the sleeve and installs the second piston plate, first piston plate and the equal sliding connection of second piston plate are in the inflator.

In order to enable the upper blade to be reset after sliding and facilitate secondary trimming, furthermore, a sliding groove is formed in the upper end face of the L-shaped cutting frame, a sliding rod is connected in the sliding groove, two first sliding blocks which are symmetrically arranged are connected on the sliding rod in a sliding mode, springs are sleeved at two ends of the sliding rod, two ends of each spring are fixedly connected with the first sliding block and the inner wall of the corresponding sliding groove respectively, a supporting rod is welded on the first sliding block at one side, and the supporting rod is welded and fixed with the driving rod.

In order to supplement air to the interior of the air cylinder, preferably, an air outlet pipe is connected to the air cylinder, and an air outlet check valve is installed in the air outlet pipe.

In order to enable the upper blade and the lower blade to cooperate to trim the lawn, preferably, the lower blade is mounted on the L-shaped cutting frame, the cutting edges of the upper blade and the lower blade are both inclined planes, and the cutting edges of the upper blade and the lower blade are arranged in a mirror image manner.

In order to conveniently replace the upper blade, preferably, pin platforms are installed on two sides of the upper blade, pin holes matched with the pin platforms are formed in the bottom of the fixing block, and locking bolts are connected between the pin platforms and the pin holes.

In order to adjust the height of the L-shaped cutting frame conveniently and adapt to the trimming of lawns with different heights, preferably, the second sliding blocks are symmetrically installed on one side, close to the L-shaped supporting seat, of the L-shaped cutting frame, sliding rail seats are symmetrically installed on the L-shaped supporting seat, and the second sliding blocks are connected in the sliding rail seats in a sliding mode.

In order to drive the altitude mixture control of L shape cutting frame, preferably, the mounting groove has been seted up on the L shape supporting seat, install a plurality of second gasbag seats in the mounting groove, it is a plurality of communicate each other between the second gasbag seat, be connected with the second intake pipe between inflator and the second gasbag seat.

In order to reduce the back suction of cut grass clippings into the nozzle, which can cause the nozzle to be blocked, the nozzle is preferably provided with a filter screen.

Compared with the prior art, the invention provides a pruning machine for a garden lawn, which has the following beneficial effects:

1. this kind of trimming machine for garden lawn, when inflator extrusion air, but partial air makes the inflation or the shrink of the gasbag face of admitting air and giving vent to anger realization of first gasbag seat intermittent type formula, when the inflation of admitting air of first gasbag seat, the gasbag face of bloating supports the actuating lever, make the actuating lever pass through the fixed block and drive the blade and slide to one side in L shape cutting frame, when the shrink of giving vent to anger of first gasbag seat, gasbag face indent, make the actuating lever pass through the fixed block and drive the blade and reset, satisfy the required power in pruning lawn with this, the energy can be saved.

2. According to the pruning machine for the garden lawn, when the air cylinder extrudes air, part of the air can be intermittently sprayed out through the nozzle to blow away grass scraps clamped between the upper blade and the lower blade, and the pruning efficiency is improved.

3. This kind of trimmer for garden lawn, when needing to adjust the height of L shape cutting frame according to actual conditions, the valve in first intake pipe and the air-out pipe is closed, and the air extrusion in the inflator gets into the second intake pipe and aerifys the second gasbag seat, and the inflation of second gasbag seat is with the jacking of L shape cutting frame and slide through the slide rail seat, aerifys the back that finishes, and the control valve in the second intake pipe is closed, makes L shape cutting frame keep at current height, reinforcing device's practicality.

Drawings

Fig. 1 is a schematic structural view of a trimmer for garden lawns according to the present invention;

FIG. 2 is a schematic structural view of an air supply assembly of the trimmer for garden lawns according to the present invention;

FIG. 3 is a schematic view of a second perspective of an air supply assembly of the trimmer for garden lawns according to the present invention;

FIG. 4 is a schematic side view of an L-shaped support seat of the pruning machine for garden lawns according to the present invention;

FIG. 5 is a schematic view of an upper blade structure of a trimmer for garden lawns according to the present invention;

FIG. 6 is a schematic view of an internal structure of a chute of the trimmer for garden lawns according to the present invention;

fig. 7 is an enlarged schematic view of a structure a in fig. 1 of the trimmer for a garden lawn according to the present invention.

In the figure: 1. a housing; 101. a rectangular notch; 2. a side plate; 3. an L-shaped support seat; 301. mounting grooves; 4. an L-shaped cutting frame; 401. a chute; 5. an upper blade; 501. a pin table; 6. a fixed block; 601. a pin hole; 7. a hollow tube; 8. a nozzle; 9. a first airbag seat; 10. a drive rod; 11. an air cylinder; 12. a first intake pipe; 13. an intake manifold; 14. rotating the rod; 15. an auxiliary wheel; 16. a first pulley; 17. a second pulley; 18. a motor; 19. a third belt pulley; 20. a first U-shaped seat; 21. a second U-shaped seat; 22. a first rotating shaft; 23. a second rotation shaft; 24. a gear; 25. a fourth pulley; 26. a sleeve; 27. a piston rod; 28. a first piston plate; 29. a second piston plate; 30. a slide bar; 31. a first slider; 32. a spring; 33. a strut; 34. a lower blade; 35. a second slider; 36. a slide rail seat; 37. a second airbag seat; 38. a second intake pipe; 39. an air outlet pipe; 40. an air outlet one-way valve; 41. locking the bolt; 42. filtering with a screen; 43. a first link; 44. a second link; 45. a third link; 46. a fourth link; 47. a first cross bar; 48. a fifth link; 49. a second cross bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1:

referring to fig. 1-7, a trimmer for garden lawns comprises a housing 1 with a rectangular notch 101 formed on one side, and further comprises: with 1 both sides welded fastening's of casing curb plate 2, the welding has L shape supporting seat 3 between the curb plate 2 of both sides, has L shape cutting frame 4 through lifting unit sliding connection on the L shape supporting seat 3, and sliding connection goes up blade 5 in L shape cutting frame 4, goes up the symmetry on the blade 5 and installs fixed block 6, is connected with hollow tube 7 between the symmetry fixed block 6, and equidistant a plurality of nozzles 8 of installing on hollow tube 7, installs filter screen 42 in the nozzle 8.

Furthermore, the L-shaped cutting frame 4 is provided with a lower blade 34, the cutting edges of the upper blade 5 and the lower blade 34 are both inclined planes, and the cutting edges of the upper blade 5 and the lower blade 34 are arranged in a mirror image manner.

The lawn is trimmed by the shearing force between the upper blade 5 and the lower blade 34, and the trimmed grass scraps are scattered on the ground for natural degradation and provide nutrients for the lawn.

In operation, the working surfaces of the plurality of nozzles 8 face the upper blade 5 for blowing away grass clippings caught between the upper blade 5 and the lower blade 34, improving the efficiency of the trimming.

A first air bag seat 9 arranged on the side plate 2 at one side, and a driving rod 10 is arranged between the first air bag seat 9 and the fixing block 6 at the same side.

The expansion or the shrink of the gasbag face is realized with giving vent to anger to first gasbag seat 9 accessible, and when the inflation of admitting air of first gasbag seat 9, the gasbag face that swells supports actuating lever 10, makes actuating lever 10 drive blade 5 through fixed block 6 and slides to one side in L shape cutting frame 4, when the shrink of giving vent to anger of first gasbag seat 9, the gasbag face indent makes actuating lever 10 drive blade 5 through fixed block 6 and resets to this satisfies the required power of pruning lawn.

An air cylinder 11 is arranged in the machine shell 1, an air supply component is connected in the air cylinder 11 in a sliding mode, a first air inlet pipe 12 is connected between the air cylinder 11 and the first air bag seat 9, and an air inlet branch pipe 13 is connected between the air cylinder 11 and the hollow pipe 7.

Furthermore, the air cylinder 11 is connected with an air outlet pipe 39, and an air outlet check valve 40 is arranged in the air outlet pipe 39.

The air cylinder 11 provides wind power for air inlet of the first air bag seat 9 and air outlet of the nozzle 8, air is intermittently extruded out of the air cylinder 11 under the action of the air supply assembly and respectively enters the nozzle 8 and the first air bag seat 9 through the first air inlet pipe 12 and the air inlet branch pipe 13, and when the air is extruded out, the air returns to the air cylinder 11 from the air outlet pipe 39 under the action of the air supply assembly for air compensation, so that the nozzle 8 can intermittently spray airflow to blow away grass clippings clamped between the upper blade 5 and the lower blade 34.

It should be noted that the air inlet check valve is installed in the first air inlet pipe 12, so that air can only flow from the air cylinder 11 to the first air inlet pipe 12, but cannot flow in the reverse direction, and the air outlet check valve 40 installed in the air outlet pipe 39, so that air can only enter the air cylinder 11, but cannot be exhausted.

Referring to fig. 1, a rotating rod 14 is rotatably connected between the symmetrical side plates 2, a first belt wheel 16 and a second belt wheel 17 are coaxially installed on the rotating rod 14, two ends of the rotating rod 14 penetrate through the side plates 2 and are provided with auxiliary wheels 15, a motor 18 is installed on the casing 1, an output end of the motor 18 penetrates through the side plates 2 and is provided with a third belt wheel 19, and the third belt wheel 19 is in transmission connection with the first belt wheel 16 through a belt.

During the operation of the motor 18, the third belt wheel 19 at the output end of the motor 18 rotates, and the rotating third belt wheel 19 drives the coaxial rotating rod 14 to rotate and transmit force to the auxiliary wheels 15 at the two sides, so that the pushing force required by a worker in lawn trimming is reduced.

Referring to fig. 2-3, the air supply assembly includes a first U-shaped seat 20 and a second U-shaped seat 21 fixedly connected to the inner wall of the housing 1, a first rotating shaft 22 and a second rotating shaft 23 are rotatably connected to two sides of the opening of the first U-shaped seat 20 and the second U-shaped seat 21, the first rotating shaft 22 is provided with a gear 24, the gear 24 is engaged with the gear 24 on the same side, the second rotating shaft 23 on one side is provided with a fourth belt wheel 25, the fourth belt wheel 25 is connected to the second belt wheel 17 through a belt, a sleeve 26 and a piston rod 27 slidably connected to the sleeve 26 are installed between any one of the first rotating shaft 22 and the second rotating shaft 23 through a link mechanism, the upper end of the sleeve 26 is provided with a first piston plate 28, the upper end of the piston rod 27 penetrates through the sleeve 26 and is provided with a second piston plate 29, and the first piston plate 28 and the second piston plate 29 are slidably connected to the inside the air cylinder 11.

During the operation of the motor 18, the rotating rod 14 drives the second belt wheel 17 to rotate, the rotating second belt wheel 17 drives the fourth belt wheel 25 through a belt, the rotating fourth belt wheel 25 drives the pair of gears 24 to rotate in a meshing manner through the link mechanism, so as to drive the link mechanisms on both sides to move coaxially and reversely, and the relative sliding between the control sleeve 26 and the piston rod 27 enables the first piston plate 28 and the second piston plate 29 to approach or separate from each other, so as to realize the extrusion and suction of air.

It should be noted that the link mechanism includes a first link 43 connected with the first rotating shaft 22, one end of the first link 43 away from the first rotating shaft 22 is rotatably connected with a second link 44, one side of the second link 44 away from the first link 43 is rotatably connected with a third link 45, one end of the second rotating shaft 23 away from the gear 24 is mounted with a fourth link 46, a fifth link 48 is rotatably connected between the fourth link 46 and the third link 45, a first cross bar 47 is rotatably connected between the second links 44 on both sides, the sleeve 26 is fixedly mounted on the first cross bar 47, a second cross bar 49 is rotatably connected between the fifth links 48 on both sides, and the piston rod 27 is fixedly mounted on the second cross bar 49.

Example 2:

referring to fig. 1, fig. 6 and fig. 7, basically the same as in embodiment 1, further, a sliding groove 401 is formed in an upper end surface of the L-shaped cutting frame 4, a sliding rod 30 is connected in the sliding groove 401, two first sliding blocks 31 symmetrically arranged are slidably connected to the sliding rod 30, springs 32 are sleeved at two ends of the sliding rod 30, two ends of each spring 32 are fixedly connected to the inner walls of the first sliding block 31 and the sliding groove 401, a supporting rod 33 is welded to the first sliding block 31 at one side, and the supporting rod 33 is welded to the driving rod 10.

In an original state, the spring 32 is in a relaxed state, when the first air bag seat 9 is inflated, the spring 32 is stressed and stretched, when the first air bag seat 9 is deflated and contracted, the air bag surface is concave, and the stretched spring 32 pulls the first sliding block 31 to slide reversely under the action of reset potential energy, so that the upper blade 5 is reset, and the purpose of left-right reciprocating motion of the upper blade 5 is met.

Referring to fig. 5, pin bosses 501 are installed at both sides of the upper blade 5, pin holes 601 matched with the pin bosses 501 are formed at the bottom of the fixing block 6, and locking bolts 41 are connected between the pin bosses 501 and the pin holes 601.

The mounting between the upper blade 5 and the fixing block 6 is realized by disassembling the locking bolt 41, which facilitates the replacement of a new upper blade 5.

Referring to fig. 4, the second slide blocks 35 are symmetrically installed on one side of the L-shaped cutting frame 4 close to the L-shaped supporting seat 3, the slide rail seats 36 are symmetrically installed on the L-shaped supporting seat 3, and the second slide blocks 35 are slidably connected in the slide rail seats 36.

Furthermore, an installation groove 301 is formed in the L-shaped support base 3, a plurality of second air bag seats 37 are installed in the installation groove 301, the plurality of second air bag seats 37 are communicated with each other, and a second air inlet pipe 38 is connected between the air cylinder 11 and the second air bag seats 37.

Note that a control valve is installed in the second intake pipe 38 to control the intake or discharge of air.

Because the lawn mowing modes are different, some mowing machines can only mow weeds with fixed height, and therefore when the height of the L-shaped cutting frame 4 needs to be adjusted according to actual conditions, valves in the first air inlet pipe 12 and the air outlet pipe 39 are closed, air in the air cylinder 11 is extruded to enter the second air inlet pipe 38 to inflate the second air bag seat 37, the second air bag seat 37 is inflated and expanded to lift the L-shaped cutting frame 4 and slide through the slide rail seat 36, and after the air inflation is finished, the control valve in the second air inlet pipe 38 is closed, so that the L-shaped cutting frame 4 is kept at the existing height.

Here, the overall working process is described once more throughout:

when the lawn mower is used, the rotating rod 14 drives the second belt wheel 17 to rotate, the rotating second belt wheel 17 drives the fourth belt wheel 25 through a belt, the rotating fourth belt wheel 25 drives the pair of gears 24 to rotate in a meshed mode through the link mechanism, so that the link mechanisms on two sides are driven to coaxially and reversely move, the relative sliding of the sleeve 26 and the piston rod 27 is controlled, the first piston plate 28 and the second piston plate 29 are enabled to be close to or away from each other, the air is extruded and sucked, one part of the extruded air enters the first air bag seat 9 to expand or contract the air bag surface, when the first air bag seat 9 is inflated and expanded, the inflated air bag surface driving rod 10 abuts against the driving rod 10, the driving rod 10 drives the upper blade 5 to slide towards one side in the L-shaped cutting frame 4 through the fixing block 6, when the first air bag seat 9 is deflated, the air bag surface is recessed, the driving rod 10 drives the upper blade 5 to reset through the fixing block 6, so that the power required by lawn mowing is met, and the other part is blown out through the nozzle 8 to blow grass clippings clamped between the upper blade 5 and the lower blade 34.

When the height of the L-shaped cutting frame 4 needs to be adjusted according to actual conditions, the valves in the first air inlet pipe 12 and the air outlet pipe 39 are closed, air in the air cylinder 11 is extruded to enter the second air inlet pipe 38 to inflate the second air bag seat 37, the second air bag seat 37 is inflated to expand to lift up the L-shaped cutting frame 4 and slide through the slide rail seat 36, and after the inflation is finished, the control valve in the second air inlet pipe 38 is closed, so that the L-shaped cutting frame 4 is kept at the existing height.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a trimming machine for garden lawn, includes that casing (1) of rectangle notch (101) are seted up to one side, its characterized in that still includes:

the side plates (2) are fixedly welded with the two sides of the shell (1), an L-shaped supporting seat (3) is welded between the side plates (2) on the two sides, and the L-shaped supporting seat (3) is connected with an L-shaped cutting frame (4) in a sliding mode through a lifting assembly;

the cutter comprises an upper blade (5) which is connected in an L-shaped cutting frame (4) in a sliding manner, wherein fixing blocks (6) are symmetrically arranged on the upper blade (5), hollow pipes (7) are connected between the symmetrical fixing blocks (6), and a plurality of nozzles (8) are equidistantly arranged on the hollow pipes (7);

a first air bag seat (9) arranged on the side plate (2) at one side, and a driving rod (10) is arranged between the first air bag seat (9) and the fixing block (6) at the same side;

install inflator (11) in casing (1), sliding connection has the air feed subassembly in inflator (11), be connected with first intake pipe (12) between inflator (11) and first gasbag seat (9), be connected with air intake branch (13) between inflator (11) and hollow tube (7).

2. The trimmer according to claim 1, characterized in that a rotating rod (14) is rotatably connected between the symmetrical side plates (2), a first belt wheel (16) and a second belt wheel (17) are coaxially installed on the rotating rod (14), and two ends of the rotating rod (14) penetrate through the side plates (2) and are provided with auxiliary wheels (15);

one side install motor (18) on casing (1), the output of motor (18) runs through curb plate (2) and installs third band pulley (19), be connected through belt transmission between third band pulley (19) and first band pulley (16).

3. The trimmer according to claim 2, wherein the air supply assembly comprises a first U-shaped seat (20) and a second U-shaped seat (21) fixedly connected with the inner wall of the housing (1), a first rotating shaft (22) and a second rotating shaft (23) are respectively and rotatably connected with two sides of the opening of the first U-shaped seat (20) and the second U-shaped seat (21), a gear (24) is installed on the first rotating shaft (22), the gear (24) is meshed and connected with the same side, a fourth belt wheel (25) is installed on the second rotating shaft (23) on one side, and the fourth belt wheel (25) is in transmission connection with the second belt wheel (17) through a belt;

a sleeve (26) and a piston rod (27) which is connected in the sleeve (26) in a sliding mode are installed between any one first rotating shaft (22) and the second rotating shaft (23) through a connecting rod mechanism, a first piston plate (28) is installed at the upper end of the sleeve (26), the upper end of the piston rod (27) penetrates through the sleeve (26) and is provided with a second piston plate (29), and the first piston plate (28) and the second piston plate (29) are connected in the air cylinder (11) in a sliding mode.

4. The trimmer according to claim 3, wherein a sliding groove (401) is formed in the upper end face of the L-shaped cutting frame (4), a sliding rod (30) is connected in the sliding groove (401), two first sliding blocks (31) which are symmetrically arranged are connected on the sliding rod (30) in a sliding manner, springs (32) are sleeved at two ends of the sliding rod (30), and two ends of each spring (32) are fixedly connected with the first sliding block (31) and the inner wall of the sliding groove (401);

one side first slider (31) go up the welding have branch (33), branch (33) and actuating lever (10) welded fastening.

5. The trimmer for garden lawns according to claim 1, wherein the air cylinder (11) is connected with an air outlet pipe (39), and an air outlet check valve (40) is installed in the air outlet pipe (39).

6. The trimmer for garden lawns according to claim 1, wherein the L-shaped cutting frame (4) is provided with a lower blade (34), the cutting edges of the upper blade (5) and the lower blade (34) are inclined surfaces, and the cutting edges of the upper blade (5) and the lower blade (34) are mirror images.

7. The trimmer for the garden lawns according to claim 1, wherein the pin platforms (501) are installed on two sides of the upper blade (5), the bottom of the fixing block (6) is provided with pin holes (601) matched with the pin platforms (501), and locking bolts (41) are connected between the pin platforms (501) and the pin holes (601).

8. The trimmer according to claim 1, wherein the L-shaped cutting frame (4) is symmetrically provided with second sliding blocks (35) at one side close to the L-shaped supporting seat (3), the L-shaped supporting seat (3) is symmetrically provided with sliding rail seats (36), and the second sliding blocks (35) are slidably connected in the sliding rail seats (36).

9. The trimming machine for the garden lawns according to claim 1, wherein the L-shaped supporting seat (3) is provided with a mounting groove (301), a plurality of second air bag seats (37) are mounted in the mounting groove (301), the second air bag seats (37) are communicated with each other, and a second air inlet pipe (38) is connected between the air cylinder (11) and the second air bag seats (37).

10. A trimmer for garden lawns according to claim 1, wherein a screen (42) is mounted in the nozzle (8).