CN210042820U

CN210042820U - Automatic walking gardens trimming machine

Info

Publication number: CN210042820U
Application number: CN201920228657.1U
Authority: CN
Inventors: 吴祺礼
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-02-20
Filing date: 2019-02-20
Publication date: 2020-02-11
Anticipated expiration: 2029-02-20

Abstract

The utility model discloses an automatic walking type garden trimmer, which comprises a power locomotive and a trimming device, wherein a turntable support which is driven by the power device to horizontally rotate is rotatably connected on the power locomotive, a lower support arm and a base oil cylinder which drives the lower support arm to swing are hinged on the turntable support, at least two overhanging support arms and an extending oil cylinder which is used for driving the overhanging support arms to swing and adjusting overhanging distance are hinged on the end part of the support arm, and a sphere is connected on a connecting seat; set up two sets of trimming means on spheroidal side, trimming means includes screw means and pruning ring, screw means includes the spiral support, set up the sleeve on the spiral support, trimming means's rotating blade can be changed, operating personnel can be according to the shape of pruning branch, the difference of size to select suitable blade, operate, make the application range of device more wide, in case appear under the circumstances that the blade damaged, can carry out the blade of renewal, the time of maintenance has been saved, work efficiency is provided.

Description

Automatic walking gardens trimming machine

Technical Field

The utility model relates to a garden machine equipment field specifically is an automatic walking gardens trimming machine.

Background

At present, both sides of an urban road or an expressway are provided with green belts, for example, high wintergreen planted on both sides of the expressway, small green trees of various shapes and the like, green trees planted in an isolation belt arranged in the middle of the expressway, and green trees arranged on both sides of the expressway. Most of garden green belts are trimmed manually by a common handheld trimmer, so that the labor intensity is high and the labor efficiency is low; because the trimming machine of own has certain self weight, be difficult to go to accomplish when pruning the greenbelt of eminence and side simultaneously and have great working strength, often so the operation causes work efficiency low easily for a long time, and leads to people's health fatigue very easily, in addition, the afforestation trees of highway middle or both sides are difficult to be pruned, and its height is higher and need artifical climbing, therefore not only work efficiency is low but also there is certain potential safety hazard.

In addition, the existing pruning machine has low mechanical efficiency, single pruning style, can not meet the requirements of garden pruning, has the disadvantages of short operation, time and labor waste and low efficiency, and in addition, the pruning device is unstable in pruning and unattractive in the using process due to the driving of a motor, the existing device is fixed to the cutter head and can not be replaced, so that only one type of tree or flower and grass can be pruned, the pruning effect is single, and the thickness and the hardness of different trees are different, thereby causing serious damage to the cutter blade.

Disclosure of Invention

The utility model discloses a shortcoming to existence among the prior art provides one kind can carry out automatic pruning and efficient automatic walking gardens trimming machine to the greenbelt of road both sides to solve the pruning machine mechanical efficiency that exists among the prior art lower, working strength is big, work efficiency is low, prune shortcomings such as style is single, the molding is not pleasing to the eye.

An automatic walking type garden trimmer comprises a power locomotive, a trimming device and a controller, wherein a turntable support driven by the power device to horizontally rotate is rotatably connected to the power locomotive, a lower supporting arm and a base oil cylinder for driving the lower supporting arm to swing are hinged to the turntable support, at least two extending supporting arms and an extending oil cylinder for driving the extending supporting arms to swing and adjusting extending distance are hinged to the end portion of the lower supporting arm, a connecting seat and a rotary power device for driving the connecting seat to rotate are rotatably connected to the end portion of the extending supporting arms, a plane formed by the rotary track of the connecting seat is parallel to or coincident with a plane formed by the swing track of the extending supporting arms, and a sphere is connected to the connecting seat;

two groups of trimming devices are arranged on the side surface of the sphere, each trimming device comprises a spiral device and a trimming ring, the spiral device comprises a spiral support and a sleeve arranged on the spiral support, the lengths of the sleeves of the two groups of trimming devices are different, the sleeves are sequentially provided with two rows of first telescopic rods, second telescopic rods and third telescopic rods through hydraulic cylinders from inside to outside, the outer end of the third telescopic rod is provided with a push rod, the outer end of the push rod is provided with a tension spring with strong hardness, the outer end of the tension spring is provided with a hook, each trimming ring comprises a plurality of metal frameworks, pin shaft mounting holes are formed in the two end parts and the midpoint position of each metal framework, the middle pin shaft mounting holes of each two metal frameworks are superposed and are mounted into an X-shaped cross moving part through pin shafts, the end parts on the opposite sides of every two X-shaped cross moving parts are connected through pin shafts, and the X-shaped, the two hooks are respectively and fixedly connected with two metal frameworks of one X-shaped cross moving piece on the trimming ring;

a micro motor is arranged below the connecting pin shaft of every two X-shaped cross moving parts in the trimming ring, a detachable rotating blade is arranged on the output shaft of the micro motor,

the power device, the base oil cylinder, the micro motor, the stretching oil cylinder and the rotating power device are all controlled by the controller.

Preferably, the radius of the shear ring in its fully extended state is 3 times greater than in its fully contracted state.

In a more preferred embodiment, the maximum length of the rotary blade is no greater than 1/2 the length of the metal skeleton.

In a more preferred embodiment, each of the two sets of trimming means is disposed at an angle of between 110 ° and 180 ° to the axis in the middle of the ball.

In a more preferred embodiment, the rear end of the extension cylinder and the rod end of the piston are respectively hinged to the front portion of the front one of the two adjacent extension arms and the middle front portion of the rear one of the two adjacent extension arms.

In a more preferable embodiment, the connecting base is rotatably connected to a rotating shaft at the overhanging end part of the overhanging supporting arm, the rotary power device comprises a rotary gearbox connected to the overhanging supporting arm and in power connection with a servo drive motor, a worm section is arranged on a power output shaft of the rotary gearbox, and a power worm wheel meshed with the worm section is arranged on the rotating shaft.

In a more preferred embodiment, the rotary power device comprises a connecting rod fixedly connected to the connecting seat, the connecting rod is hinged to the extending end of the extending support arm through a hinge shaft, the extending support arm is hinged to a pulling cylinder, and a piston rod of the pulling cylinder is hinged to the connecting seat.

In a more preferable embodiment, the turntable support is rotatably connected to a main rotating shaft of a rear support seat of the power locomotive, the power device comprises a main transmission box which is connected to the rear support seat and is driven by power of a main driving motor, a worm section is arranged on a power output shaft of the main transmission box, and a worm wheel meshed with the worm section is arranged on the main rotating shaft.

In a more preferred embodiment, the rear supporting seat is provided with a braking plate which is driven by an electric push rod and can be abutted against the turntable support, and the electric push rod and the main driving motor are controlled by the controller.

In a more preferred embodiment, the controller is automatically controlled by a PLC controller.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a rotary blade of trimming means can change, and operating personnel can be according to the shape of pruning branch, the difference of size to select suitable blade to operate, makes the application range of device wider, and the practicality is strong, in case the blade damage condition appears, can carry out the blade of renewal, has saved the time of maintenance, provides work efficiency;

the utility model discloses two sets of trimming means have been set up, stability can be high, trimming means includes the helical support, in addition, the helical support structure has reduced the vibrations of constructor in operation process greatly, thereby make the device more stable, set up first telescopic link, the second telescopic link, the third telescopic link, push rod and extension spring, the rate of telescoping improves greatly, it is inequality to set up telescopic length, can be according to the height of different branches, through adjusting the different sleeve of rotation axis selection, according to the thickness of different branches, change different rotary cutter piece, thereby better realization is to the pruning of branch.

The utility model discloses an above-mentioned mechanism can carry out the automation to the greening plant of urban road both sides or highway both sides and prune, has the advantage that labor efficiency is high and pruning scope is big.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural view of the self-walking garden trimmer according to the present invention;

FIG. 2 is a schematic view of the structure in the direction B in FIG. 1;

FIG. 3 is a schematic structural view taken along line D-D in FIG. 2;

FIG. 4 is a schematic diagram of a use state of the embodiment in FIG. 1;

fig. 5 is a schematic structural diagram of another embodiment of the present invention;

fig. 6 is a schematic structural view of the pruning ring of the automatic walking garden pruning machine according to the present invention in a contracted state;

fig. 7 is a schematic structural view of the pruning ring of the automatic walking garden pruning machine according to the present invention in an extended state;

fig. 8 is a schematic structural view of a trimming ring of the automatic walking type garden trimmer according to the present invention;

fig. 9 shows different shapes of the rotary blades of the self-walking type garden trimmer according to the present invention;

fig. 10 is a state diagram of the present invention in which the sleeve of the walk-behind auto-pruning machine is extended;

fig. 11 is a state diagram of the retraction in the sleeve of the automatic walking type garden trimmer according to the present invention;

fig. 12 is an enlarged view of the trimming device at C in fig. 1.

The drawing shows the following marks of 1, a power locomotive, 2, a turntable support, 3, a lower support arm, 4, a base oil cylinder, 5, an overhanging support arm, 6, an extending oil cylinder, 7, a connecting seat, 8, a connecting rod, 9, a pulling oil cylinder, 10, a main driving motor, 11, a main gearbox, 12, a brake plate, 17, a power output shaft, 18, a trimming device, 19, a sphere, 20, a spiral device, 21, a spiral support, 22, a sleeve, 23, a first telescopic rod, 24, a second telescopic rod, 25, a third telescopic rod, 26, a push rod, 27, a tension spring, 28, a hook, 29, a trimming ring, 30, a metal framework, 31, a pin shaft, 32, a micro motor, 33, a rotary blade, 34 and an electric push rod.

Detailed Description

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

As shown in fig. 1 to 12, an automatic walking type garden trimmer comprises a power locomotive 1, wherein the power locomotive 1 can be a tractor or other locomotives, and the specific walking mechanism, power mechanism and control mechanism thereof are all prior art, and are not described herein again, a power device is rotatably connected to the power locomotive 1 to drive a turntable support 2 which horizontally rotates, a lower support arm 3 and a base cylinder 4 which drives the lower support arm 3 to swing are hinged to the turntable support 2, two overhanging support arms 5 and an extending cylinder 6 which is used for driving the overhanging support arms to swing and adjusting overhanging distance are hinged to the lower support arm 3, in this embodiment, two overhanging support arms 5 are sequentially hinged to the end of the lower support arm 3, the rear end and the piston rod end of the extending cylinder 6 are respectively hinged to the front portion of the front overhanging support arm 5 and the middle front portion of the rear overhanging support arm 5 of the two adjacent overhanging support arms, the front-rear position means that the position close to the power locomotive is the rear end of the overhanging arm, and the lower support arm 3 and the two overhanging arms 5 are all in the same plane, so that the overhanging ends of the overhanging arms 5 can be extended outwards by the power drive of the base cylinder 4 and the extending cylinder 6. The end part of the overhanging support arm 5 is rotationally connected with a connecting seat 7 and a rotary power device for driving the connecting seat 7 to rotate, a plane formed by the rotating track of the connecting seat 7 is parallel to or coincided with a plane formed by the swinging track of the overhanging support arm 5, and the connecting seat 7 is connected with a ball body 19.

Two groups of trimming devices 18 are arranged on the side surface of a sphere 19, each group of trimming device in the two groups of trimming devices 18 and an axis in the middle of the sphere 19 are arranged at an angle of 110-180 degrees, each group of trimming device 18 comprises a spiral device 20 and a trimming ring 29, the spiral device 20 comprises a spiral support 21, a sleeve 22 is arranged on the spiral support 21, the lengths of the sleeves 22 of the two groups of trimming devices 18 are different, two rows of first telescopic rods 23, second telescopic rods 24 and third telescopic rods 25 are sequentially arranged in the sleeve 22 from inside to outside through hydraulic cylinders, a push rod 26 is arranged at the outer end of the third telescopic rod 25, a tension spring 27 with strong hardness is arranged at the outer end of the push rod 26, a hook 28 is arranged at the outer end of the tension spring 27, the trimming ring 29 comprises a plurality of metal frameworks 30, the radius of the trimming ring 29 in a fully extended state is 3 times that of the trimming ring 29 in a fully retracted state, the middle pin shaft mounting holes of every two metal frameworks 30 are overlapped and are mounted into X-shaped cross moving parts through pin shafts 31, the end parts of the opposite sides of every two X-shaped cross moving parts are connected through the pin shafts 31, the X-shaped cross moving parts are connected into an annular telescopic trimming ring 29, and two hooks 28 are respectively and fixedly connected with the two metal frameworks 30 of one X-shaped cross moving part on the trimming ring 29; a micro motor 32 is arranged below the connecting pin shaft of every two X-shaped cross moving pieces in the trimming ring 29, a detachable rotating blade 33 is arranged on the output shaft of the micro motor 32, the maximum length of the rotating blade 33 is not more than 1/2 of the length of the metal framework 30,

the power device, the base cylinder 4, the micro motor 32, the extension cylinder 6 and the rotation power device are all controlled by the controller, in this embodiment, a PLC controller is used for automatic control, and a specific control structure thereof can be obtained according to an action process, which is the prior art and is not described herein again.

The connecting base 7 is rotatably connected to a rotating shaft at the extending end part of the extending support arm 5, the rotary power device comprises a rotary gearbox which is connected to the extending support arm 5 and is in power connection with a servo drive motor, a worm section is arranged on a power output shaft of the rotary gearbox, and a power worm wheel meshed with the worm section is arranged on the rotating shaft.

The rotary power device comprises a connecting rod 8 fixedly connected to the connecting seat 7, the connecting rod 8 is hinged to the extending end of the extending support arm 5 through a hinge shaft, a pulling oil cylinder 9 is hinged to the extending support arm 5, and a piston rod of the pulling oil cylinder 9 is hinged to the connecting seat 7.

The rotary table support 2 is rotatably connected to a main rotating shaft of a rear support seat of the power locomotive 1, the power device comprises a main gearbox 11 which is connected to the rear support seat and is driven by a main driving motor 10, a worm section is arranged on a power output shaft of the main gearbox, and a worm wheel meshed with the worm section is arranged on the main rotating shaft.

The rear supporting seat is provided with a brake plate 12 which is driven by an electric push rod 34 and can be attached to the turntable support 2, and the electric push rod 34 and the main driving motor 10 are controlled by a controller.

As shown in fig. 1, in this embodiment, the rotary power device includes a connecting rod 8 fixedly connected to the connecting seat 7, the connecting rod 8 is hinged to the extending end of the extending arm 5 through a hinge shaft, the extending arm 5 is hinged to a pulling cylinder 9, a piston rod of the pulling cylinder 9 is hinged to the connecting seat 7, and the connecting seat 7 can rotate by a certain angle through a pulling action of the pulling cylinder 9, that is, the automatic cutting device is driven to rotate to adjust the cutting angle.

As shown in fig. 1, 2 and 3, the turntable support 2 is fixedly connected with a main rotating shaft which is rotatably connected to a rear support base of the power locomotive 1, the power device includes a main transmission case 11 which is connected to the rear support base and is driven by power of a main driving motor 10, a worm section is arranged on a power output shaft of the main transmission case 11, a worm wheel which is engaged with the worm section is arranged on the main rotating shaft, the main transmission case 11 is structured as shown in fig. 3, a power input shaft of the main driving motor 10 is input into the main transmission case 11 and is transmitted to a power output shaft 17 through power transmission of a bevel gear, a middle transmission shaft and a cylindrical gear, the power output shaft 17 is provided with the worm section, of course, the main transmission case 11 can have other structures, which do not exemplify one by one, the self-locking performance of the worm wheel during worm transmission is fully utilized, thereby ensuring the rotational stability of the turntable support, be equipped with on the back supporting seat by electric putter 34 drive and can paste the brake lining 12 that leans on carousel support 2, electric putter 34 and main driving motor 10 are controlled by the PLC controller, when main driving motor 10 orders about carousel support 2 and rotates, brake lining 12 breaks away from carousel support 2 under electric putter 34's drive, when above-mentioned carousel support rotates and stops, electric putter 34 drive brake lining 12 pastes and leans on carousel support 2 to reduce the rotation inertia of carousel support 2, guarantee its rotation accuracy and protection power drive mechanism.

As shown in fig. 1 to 11, when a green plant on one side of an urban road needs to be trimmed, the power locomotive 1 is controlled to run to the roadside of the urban road, the overhanging end of the overhanging support arm 5 can be extended outwards to be positioned above or beside the green plant through the power drive of the base oil cylinder 4 and the extension oil cylinder 6, then the connecting seat 7 is driven to rotate for a certain angle through the power drive of the pulling oil cylinder 9, so that the cutting fixed knife and the cutting movable knife are positioned at the optimal cutting angle, the green plant is trimmed through the walking of the power locomotive 1, the trimming device 18 comprises a spiral device 20 and a trimming ring 29, the spiral device 20 comprises a spiral support 21, two sets of sleeves 22 are arranged on the spiral support 21, the lengths of the sleeves 22 of the two sets of trimming devices 18 are different, when branches at high positions need to be trimmed, the corresponding branches of the sleeves are lengthened through the rotating ball 19, pruning is carried out, otherwise, the short one is selected; when the pruning ring 29 reaches the operation position, the PLC controller automatically controls to open the X-shaped cross moving part, when thick branches need to be pruned, the PLC controller automatically controls to realize the extension of the pruning ring 29 and enlarge the pruning radius of the pruning ring, otherwise, when thin branches need to be pruned, the pruning ring 29 is contracted to contract the pruning radius of the pruning ring, after the pruning ring 29 is extended or contracted in place, the micro motor 32 is controlled to drive the rotary blade 33 to operate, and meanwhile, the rotary blades 33 with different shapes are replaced according to the different shapes of the pruned leaves, as shown in FIG. 9.

As shown in fig. 10 and 12, the stretching of the hydraulic cylinder is controlled by the PLC controller, so as to control the stretching of the first telescopic rod 23, the second telescopic rod 24 and the third telescopic rod 25, further to push the pushing rod 26 to stretch, so as to control the stretching of the tension spring 27 and the trimming ring 29, when the tree branches need to be trimmed, the tree branches are extended, and when the tree branches do not need to be trimmed, the tree branches are retracted, so that the occupied area can be saved, other people cannot be accidentally injured, and the tree pruning machine is safe and free of hidden dangers.

As shown in fig. 5, the present invention provides another embodiment, which has the same basic structure as the above structure and is different from the above structure in that: the connecting base 7 is rotatably connected to a rotating shaft at the extending end part of the extending support arm 5, the rotating power device comprises a rotating gearbox which is connected to the extending support arm 5 and is in power connection with a servo drive motor, a worm section is arranged on a power output shaft of the rotating gearbox, and a power worm wheel meshed with the worm section is arranged on the rotating shaft.

The utility model discloses a trimming means's rotating blade can be changed, and operating personnel can be according to the shape of being pruned the branch, the difference of size to select suitable blade, operate, make the application range of device more wide, the practicality is strong, in case under the circumstances that the blade damaged appears, can carry out the blade of renewal, has saved the time of maintenance, provides work efficiency.

The utility model discloses two sets of trimming means have been set up, stability can be high, trimming means 18 includes spiral support 21, in addition, the vibrations of constructor in operation process have been reduced greatly to spiral support 21 structure, thereby make the device more stable, set up first telescopic link 23, second telescopic link 24, third telescopic link 25, push rod 26 and extension spring 27, the rate of expansion improves greatly, the length that sets up sleeve 22 is inequality, can be according to the height of different branches, through adjusting different sleeves 22 of rotation axis selection, according to the thickness of different branches, change different rotary blade 33, thereby better realization is to the pruning of branch.

In the description of the present invention, it is to be understood that the terms "one end", "upper front", "end", "length", "width", "inner", "upper", "other end", "both ends", "horizontal", "coaxial", "bottom", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "disposed", "engaged", "connected", "fitted", "cover" and the like are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the content of the present invention or the direct or indirect application attached to the technical field of other related products are included in the patent protection scope of the present invention.

Claims

1. The utility model provides an automatic walking gardens trimming machine which characterized in that: the power locomotive comprises a power locomotive (1), a trimming device and a controller, wherein the power locomotive (1) is rotatably connected with a turntable support (2) driven by a power device to horizontally rotate, the turntable support (2) is hinged with a lower support arm (3) and a base oil cylinder (4) for driving the lower support arm (3) to swing, the end part of the lower support arm (3) is hinged with at least two overhanging support arms (5) and an extending oil cylinder (6) for driving the overhanging support arms (5) to swing and adjusting overhanging distance, the end part of the overhanging support arms (5) is rotatably connected with a connecting seat (7) and a rotary power device for driving the connecting seat (7) to rotate, a plane formed by the rotating track of the connecting seat (7) is parallel to or coincident with a plane formed by the swinging track of the overhanging support arms (5), and the connecting seat (7) is connected with a sphere (19);

two groups of trimming devices (18) are arranged on the side surface of the sphere (19), each trimming device (18) comprises a spiral device (20) and a trimming ring (29), each spiral device (20) comprises a spiral support (21) and a sleeve (22) arranged on the spiral support (21), the lengths of the sleeves (22) of the two groups of trimming devices (18) are different, the sleeves (22) are sequentially provided with two rows of first telescopic rods (23), second telescopic rods (24) and third telescopic rods (25) through hydraulic cylinders from inside to outside, the outer end of each third telescopic rod (25) is provided with a push rod (26), the outer end of each push rod (26) is provided with a tension spring (27) with strong hardness, the outer end of each tension spring (27) is provided with a hook (28), each trimming ring (29) comprises a plurality of metal frameworks (30), and pin shaft mounting holes are formed in the two end parts and the middle point positions of each metal framework (, the middle pin shaft mounting holes of every two metal frameworks (30) are overlapped and are mounted into X-shaped cross moving parts through pin shafts (31), the end parts of the opposite sides of every two X-shaped cross moving parts are connected through the pin shafts (31), the X-shaped cross moving parts are connected into an annular telescopic trimming ring, and two hooks (28) are respectively and fixedly connected with the two metal frameworks (30) of one X-shaped cross moving part on the trimming ring (29);

a micro motor (32) is arranged below the connecting pin shaft of every two X-shaped cross moving pieces in the trimming ring (29), a detachable rotating blade (33) is arranged on the output shaft of the micro motor (32),

the power device, the base oil cylinder (4), the micro motor (32), the stretching oil cylinder (6) and the rotating power device are all controlled by a controller.

2. The walk-behind garden trimmer according to claim 1, wherein: the radius of the trimming ring (29) in the fully extended state is 3 times greater than that in the fully contracted state.

3. The walk-behind garden trimmer according to claim 1, wherein: the maximum length of the rotary blade (33) is not more than 1/2 of the length of the metal framework (30).

4. The walk-behind garden trimmer according to claim 1, wherein: each of the two groups of trimming devices (18) is arranged at an angle of between 110 and 180 degrees with respect to the axis in the middle of the sphere (19).

5. The walk-behind garden trimmer according to claim 1, wherein: the rear end and the piston rod end of the extension oil cylinder (6) are respectively hinged on the front part of the front overhanging arm (5) and the middle front part of the rear overhanging arm (5) in the two adjacent overhanging arms (5).

6. The walk-behind garden trimmer according to claim 1, wherein: the connecting seat (7) is rotatably connected to a rotating shaft at the extending end part of the extending support arm (5), the rotary power device comprises a rotary gearbox which is connected to the extending support arm (5) and is in power connection with a servo drive motor, a worm section is arranged on a power output shaft of the rotary gearbox, and a power worm wheel meshed with the worm section is arranged on the rotating shaft.

7. The walk-behind garden trimmer according to claim 1, wherein: the rotary power device comprises a connecting rod (8) fixedly connected to the connecting seat (7), the connecting rod (8) is hinged to the extending end of the extending support arm (5) through a hinge shaft, a pulling oil cylinder (9) is hinged to the extending support arm (5), and a piston rod of the pulling oil cylinder (9) is hinged to the connecting seat (7).

8. The walk-behind garden trimmer according to claim 1, wherein: the rotary table support (2) is rotatably connected to a main rotating shaft of a rear support seat of the power locomotive, the power device comprises a main gearbox (11) which is connected to the rear support seat and is driven by a main driving motor (10) in a power mode, a worm section is arranged on a power output shaft (17) of the main gearbox (11), and a worm wheel meshed with the worm section is arranged on the main rotating shaft.

9. The walk-behind garden trimmer according to claim 1, wherein: the rear supporting seat is provided with a brake plate (12) which is driven by an electric push rod and can be attached to the turntable support (2), and the electric push rod (34) and the main driving motor (10) are controlled by the controller.

10. The walk-behind garden trimmer according to claim 1, wherein: the controller adopts a PLC controller to carry out automatic control.