CN210042820U - A self-propelled garden trimmer - Google Patents

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

A self-propelled garden trimmer

technical field

The utility model relates to the field of garden machinery and equipment, in particular to an automatic walking garden trimmer.

Background technique

At present, there are green belts on both sides of urban roads or highways. For example, green belts such as holly of equal height and small green trees of various shapes are planted on both sides of the highway. There are green trees on both sides of the road. Most of the pruning of landscaping belts is done manually by ordinary hand-held pruning machines, which is labor-intensive and labor-inefficient; due to the pruning machine itself has a certain weight, at the same time, it trims the green belts at high places and sides. It is not easy to complete the work with high intensity, and it is often easy to cause low work efficiency and physical fatigue when doing so for a long time. In addition, the green trees in the middle or on both sides of the expressway are not easy to prune, and their height is relatively high. It is high and requires manual climbing, so it is not only inefficient but also has certain safety hazards.

In addition, the existing pruning machine has low mechanical efficiency, single pruning style, can not meet the requirements of garden pruning, and the operation is not simple enough, time-consuming and laborious, and low in efficiency. In addition, the pruning device is driven by the motor during use. As a result, the pruning is unstable and the shape is unsightly. The existing device is fixed for the part of the cutter head and cannot be replaced, resulting in only one type of tree or flower and grass can be pruned, so that the effect of pruning is single, The thickness and hardness of different trees are different, which will cause serious damage to the blade. In view of the shortcomings in the prior art, it is necessary to provide a novel device.

SUMMARY OF THE INVENTION

The purpose of this utility model is to provide a self-propelled garden pruning machine that can automatically trim the green belts on both sides of the road and has high efficiency in view of the shortcomings in the prior art, so as to solve the problem of the existing pruning machine in the prior art. It has the disadvantages of low efficiency, high work intensity, low work efficiency, single trimming style, and unsightly shape.

An automatic walking garden trimmer, comprising a power locomotive, a trimming device and a controller, the power locomotive is rotatably connected with a turntable support that is driven by the power device to rotate horizontally, and a lower support arm and a drive lower support are hinged on the turntable support The base oil cylinder for arm swing, the end of the lower support arm is hinged with at least two outrigger arms and an extension oil cylinder for driving the outrigger to swing and adjust the outreach distance, and the end of the outrigger rotates on the outrigger A connecting seat and a rotary power device for driving the connecting seat to rotate are connected, the plane formed by the rotation track of the connecting seat and the plane formed by the swing track of the outrigger arm are parallel or coincident, and the connecting seat is connected with a sphere ;

Two sets of trimming devices are arranged on the side of the sphere, the trimming devices include a screw device and a trimming ring, the screw device includes a screw support and a sleeve arranged on the screw support, and the lengths of the sleeves of the two sets of trimming devices are different. The sleeve is provided with two rows of a first telescopic rod, a second telescopic rod and a third telescopic rod through the hydraulic cylinder from the inside to the outside. The outer end of the third telescopic rod is provided with a push rod, and the outer end of the push rod is provided with a hardness Strong tension spring, the outer end of the tension spring is provided with hooks, the trimming ring includes a plurality of metal skeletons, the two ends and the midpoint of each metal skeleton are provided with pin shaft mounting holes, and the middle part of each two metal skeletons is provided. The mounting holes of the pin shaft are overlapped and installed through the pin shaft to form an "X"-shaped cross movable piece. The opposite ends of each two "X"-shaped cross movable pieces are connected by a pin shaft, and a plurality of "X"-shaped cross movable pieces are connected to form a An annular telescopic trimming ring, the two hooks are respectively fixedly connected with the two metal skeletons of one of the "X"-shaped cross movable parts on the trimming ring;

In the trimming ring, a micro-motor is installed below the connecting pin shaft of each two "X"-shaped cross movable parts, and a detachable rotating blade is installed on the output shaft of the micro-motor,

The power unit, base cylinder, micro motor, extension cylinder and rotary power unit are all controlled by the controller.

Preferably, the radius of the trimming ring in the fully extended state is 3 times that in the fully retracted state.

In a more preferred embodiment, the maximum length of the rotating blade is not greater than 1/2 of the length of the metal skeleton.

In a more preferred embodiment, each of the two groups of trimming devices is disposed between 110° and 180° with the axis in the middle of the sphere.

In a more preferred embodiment, the rear end of the extending cylinder and the end of the piston rod are hingedly mounted on the front part of the former outrigger arm and the rear outrigger arm of the two adjacent outrigger arms, respectively. Middle front.

In a more preferred embodiment, the connecting base is rotatably connected to the rotating shaft of the outrigger end of the outrigger arm, and the rotary power device includes a rotary speed changer connected to the outrigger arm and powered by the servo drive motor A worm segment is arranged on the power output shaft of the rotary gearbox, and a power worm gear engaged with the worm segment is mounted on the rotating shaft.

In a more preferred embodiment, the rotary power device includes a connecting rod fixed on the connecting base, and the connecting rod is hinged with the outrigger end of the outrigger arm through a hinge shaft, and the outrigger arm is on the The hinge is equipped with a pulling oil cylinder, and the piston rod of the pulling oil cylinder is hinged with the connecting seat.

In a more preferred embodiment, the turntable support is rotatably connected to the main shaft of the rear support seat of the power locomotive, and the power device includes a main gearbox connected to the rear support seat and driven by the power of the main drive motor, A worm segment is arranged on the power output shaft of the main gearbox, and a worm wheel meshing with the worm segment is mounted on the main rotating shaft.

In a more preferred embodiment, the rear support base is provided with a brake plate which is driven by an electric push rod and can abut on the turntable support, and the electric push rod and the main drive motor are controlled by a controller.

In a more preferred embodiment, the controller adopts a PLC controller for automatic control.

Compared with the prior art, the beneficial effects of the present utility model are:

The rotating blade of the pruning device of the utility model can be replaced, and the operator can select a suitable blade for operation according to the shape and size of the pruned branches, so that the use range of the device is wider and the practicability is strong. When the blade is damaged, it can be replaced with a new blade, which saves maintenance time and improves work efficiency;

The utility model is provided with two sets of trimming devices, and the stability is high. The first telescopic rod, the second telescopic rod, the third telescopic rod, the push rod and the tension spring, the telescopic rate is greatly improved, and the lengths of the sleeves are different. Different sleeves can be selected by adjusting the rotating shaft according to the height of different branches. According to the thickness of different branches, different rotating blades can be replaced, so as to better achieve the pruning of branches.

The utility model can automatically trim the greening plants on both sides of the city road or the two sides of the expressway through the above-mentioned mechanism, and has the advantages of high labor efficiency and large trimming range.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural representation of a kind of automatic walking garden pruning machine described in the utility model;

Fig. 2 is the structural representation of B direction in Fig. 1;

Fig. 3 is the structural schematic diagram taken along the D-D line in Fig. 2;

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

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

6 is a schematic structural diagram of a self-propelled garden trimmer according to the present invention when the trimming ring is in a retracted state;

7 is a schematic structural diagram of a self-propelled garden trimmer according to the present utility model when the trimming ring is in an extended state;

8 is a schematic structural diagram of a trimming ring of a self-propelled garden trimmer according to the present invention;

Fig. 9 is the rotary blade of different shapes of a kind of self-propelled garden pruning machine according to the utility model;

Figure 10 is a state diagram of the extension in the sleeve of a self-propelled garden trimmer according to the present invention;

Figure 11 is a state diagram of the shrinkage in the sleeve of a self-propelled garden trimmer according to the present invention;

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

The marks in the accompanying drawings are described as follows: 1, power locomotive, 2, turntable support, 3, lower support arm, 4, base oil cylinder, 5, outstretched support arm, 6, extension oil cylinder, 7, connecting seat, 8, connecting Rod, 9, Pulling Cylinder, 10, Main Drive Motor, 11, Main Gearbox, 12, Brake Plate, 17, PTO, 18, Trimming Device, 19, Ball, 20, Screw Device, 21, Screw Bracket, 22 , sleeve, 23, first telescopic rod, 24, second telescopic rod, 25, third telescopic rod, 26, push rod, 27, tension spring, 28, hook, 29, trim ring, 30, metal frame, 31 , Pin, 32, micro motor, 33, rotary blade, 34, electric push rod.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

As shown in Figures 1 to 12, a self-propelled garden trimmer includes a power locomotive 1. The power locomotive 1 can be a tractor or other locomotive, and its specific running mechanism, power mechanism and control mechanism are all in the prior art. It will not be repeated here. The power locomotive 1 is rotatably connected with a turntable support 2 driven by a power device to rotate horizontally. The turntable support 2 is hinged with a lower support arm 3 and a base oil cylinder 4 that drives the lower support arm 3 to swing. The lower support arm 3 are hinged with two outrigger arms 5 and an extension oil cylinder 6 for driving the outrigger arms to swing and adjust the outreach distance. Outrigger arm 5, the rear end of the extension oil cylinder 6 and the end of the piston rod are hingedly mounted on the front part of the former outrigger arm 5 and the middle of the latter outrigger arm 5 in the adjacent two outrigger arms respectively. The front, the above-mentioned front and rear positions mean that the position close to the power locomotive is the rear end of the outrigger arm, and the lower support arm 3 and the two outrigger arms 5 are all in the same plane. Therefore, through the base oil cylinder 4 and the extension oil cylinder The power drive of 6 can expand the outrigger end of the outrigger arm 5 to the outside. The end of the outrigger arm 5 is rotatably connected with a connection seat 7 and a rotary power device for driving the connection seat 7 to rotate. The plane formed by the rotation trajectory of the connection seat 7 and the swing trajectory of the outrigger arm 5 The planes are parallel or coincident, and the connecting seat 7 is connected with a sphere 19 .

Two sets of trimming devices 18 are arranged on the side of the sphere 19 , each of the two sets of trimming devices 18 is arranged between 110° and 180° with the axis in the middle of the sphere 19 , and the trimming device 18 includes a screw device 20 and a trimming ring 29. The screw device 20 includes a screw support 21. A sleeve 22 is arranged on the screw support 21. The lengths of the sleeves 22 of the two groups of trimming devices 18 are different. The sleeve 22 is provided with two rows of hydraulic cylinders from the inside to the outside. The first telescopic rod 23, the second telescopic rod 24 and the third telescopic rod 25, the outer end of the third telescopic rod 25 is provided with a push rod 26, and the outer end of the push rod 26 is provided with a tensile spring 27 with strong hardness, the tension spring 27 The outer end is provided with a hook 28, the trimming ring 29 includes a plurality of metal frames 30, and the radius of the trimming ring 29 when it is in a fully extended state is three times that when it is in a fully retracted state. The positions are provided with pin shaft installation holes. The middle pin shaft installation holes of each two metal skeletons 30 overlap and are installed through the pin shaft 31 to form an "X"-shaped cross movable piece. The ends are connected by pins 31, and a plurality of "X"-shaped cross movable parts are connected to form a ring-shaped telescopic trimming ring 29. The metal frame 30 is fixedly connected; a micro-motor 32 is installed under the connecting pins of each two "X"-shaped cross movable parts in the trimming ring 29, and a detachable rotating blade 33 is installed on the output shaft of the micro-motor 32. The rotating blade 33 The maximum length is not greater than 1/2 the length of the metal skeleton 30,

The power device, the base oil cylinder 4, the micro motor 32, the stretching oil cylinder 6 and the rotary power device are all controlled by the controller. In this embodiment, a PLC controller is used for automatic control, and the specific control structure can be obtained according to the action process. , which is the prior art and will not be repeated here.

The connecting seat 7 is rotatably connected to the rotating shaft of the outrigger end of the outrigger arm 5, and the rotary power device includes a rotary gearbox that is connected to the outrigger arm 5 and is powered with the servo drive motor. A worm segment is arranged on the power output shaft, and a power worm gear engaged with the worm segment is mounted on the rotating shaft.

The rotating power device includes a connecting rod 8 fixed on the connecting seat 7, the connecting rod 8 is hinged with the outrigger end of the outrigger arm 5 through a hinge shaft, and a pulling oil cylinder is hinged on the outrigger arm 5. 9. The piston rod of the pulling oil cylinder 9 is hinged with the connecting seat 7.

The turntable support 2 is rotatably connected to the main shaft of the rear support seat of the power locomotive 1, and the power device includes a main gearbox 11 connected to the rear support seat and driven by the power of the main drive motor 10. The power of the main gearbox A worm segment is arranged on the output shaft, and a worm wheel engaged with the worm segment is mounted on the main rotating shaft.

The rear support base is provided with a brake plate 12 driven by an electric push rod 34 and can abut against the turntable support 2 , and the electric push rod 34 and the main drive motor 10 are controlled by a controller.

As shown in FIG. 1 , in this embodiment, the rotary power device includes a connecting rod 8 fixed on the connecting base 7 , and the connecting rod 8 is hinged with the overhanging end of the overhanging arm 5 through a hinge shaft, so A pulling oil cylinder 9 is hinged on the outrigger arm 5, and the piston rod of the pulling oil cylinder 9 is hinged with the connecting seat 7. Through the pulling action of the pulling oil cylinder 9, the connecting seat 7 can be rotated by a certain angle, that is, the automatic cutting device is driven to rotate. , adjust the cutting angle.

As shown in Fig. 1, Fig. 2 and Fig. 3, the turntable support 2 is fixed with a main shaft that is rotatably connected to the rear support seat of the power locomotive 1, and the power device includes a main drive motor 10 that is connected to the rear support seat and powered by the main drive motor 10. The main gearbox 11 is driven, the power output shaft of the main gearbox 11 is provided with a worm segment, and the main rotating shaft is equipped with a worm gear that meshes with the worm segment. The structure of the main gearbox 11 is shown in Figure 3. The main drive motor 10 The power input shaft is input into the main gearbox 11, and is transmitted to the power output shaft 17 through the power transmission of the bevel gear, the intermediate transmission shaft and the cylindrical gear. The power output shaft 17 is provided with the above-mentioned worm segment. Of course, the main gearbox 11 Other structures may be used, which are not listed here. The above structure makes full use of the self-locking performance of the worm gear and worm drive, thereby ensuring the rotational stability of the turntable support. The rear support seat is equipped with an electric push rod. The brake plate 12 is driven by 34 and can be attached to the turntable support 2. The electric push rod 34 and the main drive motor 10 are controlled by the PLC controller. When the main drive motor 10 drives the turntable support 2 to rotate, the brake plate 12 is in Driven by the electric push rod 34, it is separated from the turntable support 2. When the rotation of the above-mentioned turntable support stops, the electric push rod 34 drives the brake plate 12 to abut on the turntable support 2, thereby reducing the rotational inertia of the turntable support 2 and ensuring its Rotational accuracy and protection of the power drive mechanism.

As shown in Figures 1 to 11, when the green plants on the side of the urban road need to be trimmed, the power locomotive 1 is controlled to run to the side of the urban road, and driven by the power of the base cylinder 4 and the extension cylinder 6, the external The outrigger end of the outrigger arm 5 expands to the outside so that it is located above or on the side of the green plant, and then driven by the power of the pulling oil cylinder 9, the connecting seat 7 is driven to rotate at a certain angle, so that the cutting fixed knife and the cutting moving knife are in the best position. Through the walking of the power locomotive 1, the green plants are trimmed. The trimming device 18 includes a screw device 20 and a trimming ring 29. The screw device 20 includes a screw support 21. Two sets of sleeves 22 are arranged on the screw support 21. The lengths of the sleeves 22 of the group pruning device 18 are not the same. When it is necessary to prune high branches, by rotating the ball 19, the corresponding branches with long sleeves are pruned, otherwise the shorter ones are selected; when the pruning ring 29 reaches the work After the position, the PLC controller performs automatic control to open the "X"-shaped cross movable parts. When it is necessary to prune thick branches, the PLC controller performs automatic control to realize the extension of the pruning ring 29 and expand its pruning radius. When branching, the trimming ring 29 is retracted and its trimming radius is reduced. After the trimming ring 29 is stretched or retracted in place, the micromotor 32 is controlled to drive the rotary blade 33 to operate, and at the same time, the rotary blades of different shapes can be replaced according to the shape of the trimmed leaves. 33, as shown in Figure 9.

As shown in FIG. 10 and FIG. 12 , the expansion and contraction of the hydraulic cylinder is controlled by the PLC controller, thereby controlling the expansion and contraction of the first telescopic rod 23 , the second telescopic rod 24 , and the third telescopic rod 25 , and then pushes the expansion and contraction of the push rod 26 , thereby Control the extension and retraction of the tension spring 27 and the pruning ring 29. When the branches need to be pruned, they are extended, and when there is no need to prune the branches, they are retracted, which not only saves the occupied area, but also does not accidentally hurt other people. It is safe and has no hidden dangers. .

As shown in FIG. 5 , the present invention provides another embodiment, the basic structure of which is the same as the above-mentioned structure, except that the connecting seat 7 is rotatably connected to the rotating shaft of the overhanging end of the overhanging arm 5, and the rotating power The device includes a rotary gearbox that is connected to the outrigger arm 5 and is dynamically connected to the servo drive motor. The power output shaft of the rotary gearbox is provided with a worm segment, and the rotary shaft is equipped with a power worm gear that meshes with the worm segment. Described in detail in the figure, a power transmission structure similar to that of the main gearbox in the above-mentioned first embodiment may be adopted, and details are not repeated here.

The rotating blade of the pruning device of the utility model can be replaced, and the operator can select a suitable blade according to the shape and size of the pruned branches, so as to operate the device, so that the use range of the device is wider and the practicability is strong. When the blade is damaged, it can be replaced with a new blade, which saves maintenance time and improves work efficiency.

The utility model is provided with two sets of trimming devices, which have high stability. The trimming device 18 includes a spiral support 21. In addition, the structure of the spiral support 21 greatly reduces the vibration of the construction personnel during the operation process, thereby making the device more stable. , set the first telescopic rod 23, the second telescopic rod 24, the third telescopic rod 25, the push rod 26 and the tension spring 27, the expansion and contraction rate is greatly improved, and the length of the sleeve 22 is not the same. Adjust the rotating shaft to select different sleeves 22, and replace different rotating blades 33 according to the thickness of different branches, so as to better realize the pruning of branches.

The utility model can automatically trim the greening plants on both sides of the city road or the two sides of the expressway through the above-mentioned mechanism, and has the advantages of high labor efficiency and large trimming range.

In the description of the present invention, it should be understood that the terms "one end", "front upper", "end", "length", "width", "inside", "upper", "the other end", " The orientation or positional relationship indicated by "two ends", "horizontal", "coaxial", "bottom", "below", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. , rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

In the present utility model, unless otherwise expressly specified and limited, the terms "arrangement", "engagement", "connection", "insert", "cover" and other terms should be understood in a broad sense, for example, it may be a fixed connection , it can be detachable connection or integrated; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the mutual connection of two elements relationship, unless otherwise expressly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model patent. Any equivalent structural transformation made by using the contents of the present utility model description, or directly or indirectly applied in the technical fields of other related products , are similarly included in the scope of patent protection of the present invention.

Claims (10)

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.

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