CN115428644A

CN115428644A - Mower and control method thereof

Info

Publication number: CN115428644A
Application number: CN202110609973.5A
Authority: CN
Inventors: 赵凤丽; 查霞红
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2022-12-06

Abstract

The application provides a lawn mower and a control method of the lawn mower, wherein the lawn mower comprises: at least one first cutting unit configured to form a first cutting region at a first height; and at least one second cutting unit disposed with the first cutting unit along a length of the mower, the second cutting unit configured to form a second cutting zone at a second height; wherein the first height is different from the second height.

Description

Mower and control method thereof

Technical Field

The application belongs to the field of gardening tools, and particularly relates to a mower and a control method of the mower.

Background

The lawn mower can be used for performing a mowing task, trimming a lawn and keeping the lawn clean. The prior art mower comprises a rotary cutter with a flanging, and the rotary cutter with the flanging can form an ascending air flow through the flanging when rotating, so that grass moves upwards and is cut for multiple times. But the rotary cutter with the flanging has large resistance and high energy consumption during rotation. If the rotary cutter is not provided with a flanging, although the grass can be cut off, the cut grass is long in length and easy to wind, so that the motor is blocked.

Disclosure of Invention

The application aims to provide a mower convenient for cutting long-length grass and a control method of the mower.

The application provides a lawn mower, lawn mower includes:

at least one first cutting unit configured to form a first cutting region at a first height; and

at least one second cutting unit disposed along a length of the mower with the first cutting unit, the second cutting unit configured to form a second cutting zone at a second height;

wherein the first height is different from the second height.

Preferably, the second cutting unit is spaced apart from the first cutting unit along the length of the lawnmower.

Preferably, the first cutting unit is provided in plurality, the plurality of first cutting units being arranged in a width direction of the lawnmower, the first cutting zones of the plurality of first cutting units being equal in height; and/or the presence of a gas in the gas,

the second cutting unit is provided in plurality, the plurality of second cutting units are arranged in a width direction of the lawn mower, and heights of the second cutting areas of the plurality of second cutting units are the same.

Preferably, projections of the first cutting zones of adjacent first cutting units on a plane perpendicular to a length direction of the lawn mower along the length direction of the lawn mower have overlapping portions;

the second cutting zones of adjacent second cutting units have overlapping portions in a projection of a length direction of the lawn mower onto a plane perpendicular to the length direction of the lawn mower.

Preferably, the first cutting unit comprises a first cutter disc and a plurality of groups of first blades, wherein the first blades of each group are arranged on the first cutter disc at intervals along the height direction of the mower;

the second cutting unit comprises a second cutter disc and a plurality of groups of second blades, wherein the second blades of each group are arranged on the second cutter disc at intervals along the height direction of the mower.

Preferably, the cutting radius of each set of the first blades gradually increases and the cutting radius of each set of the second blades gradually increases in a direction away from the ground in a height direction of the lawnmower.

Preferably, the first cutting unit is configured to be mounted to a housing and/or a frame of the lawn mower with an installation height adjustable in a height direction of the lawn mower;

the second cutting unit is configured to be mounted to a housing and/or a frame of the lawn mower with an installation height adjustable in a height direction of the lawn mower.

Preferably, the lawn mower further comprises a first driving unit for driving the first cutting unit, and a second driving unit for driving the second cutting unit; or,

the lawn mower further comprises a driving device, wherein the driving device comprises a clutch used for driving the first cutting unit and the second cutting unit alternatively or simultaneously.

The present application further provides a lawn mower, the lawn mower includes:

at least one second cutting unit disposed along a width direction of the lawn mower with the first cutting unit, the second cutting unit configured to form a second cutting area at a second height;

wherein the first height is different from the second height.

Preferably, along the length direction (X) of the mower, the axis of the first cutting zone (S1) has a first projection on a plane perpendicular to the length direction (X) of the mower, and the axis of the second cutting zone (S2) has a second projection on a plane perpendicular to the length direction (X) of the mower; wherein the perpendicular distance of the first projection from the second projection is smaller than or equal to the sum of the radii of the first cutting region (S1) and the second cutting region (S2).

Preferably, the first cutting unit is configured to be mounted to a housing and/or a frame of the lawn mower with an adjustable mounting height in a height direction of the lawn mower;

The present application further proposes a control method of a mower as claimed in any one of the above solutions,

obtaining the grass height of a region to be cut;

judging whether the grass height of the area to be cut is greater than or equal to a preset grass height, if so, controlling the first cutting unit and the second cutting unit to work simultaneously; if not, controlling the first cutting unit or the second cutting unit to work.

Preferably, the grass height of the area to be cut comprises the average grass height or the maximum grass height of the area to be cut.

Through adopting above-mentioned technical scheme, through setting up the first cutting unit and the second cutting unit of high difference on the length direction at lawn mower, make lawn mower carry out the single walking, alright make the longer grass of walking route on the way cut on the co-altitude, and then cut short, cut up the grass, and do not have the duplicate path in the walking route, can save cutting time greatly when guaranteeing cutting effect.

By adopting the technical scheme, the first cutting unit and the second cutting unit with different heights are arranged in the width direction of the mower, so that the mower can walk once in a preset area according to a planned path, longer grass in the preset area can be cut at different heights, the grass is cut short and cut up, no repeated path exists in the walking path, and the cutting time can be greatly saved while the cutting effect is ensured.

By using the control method of the mower, the working mode can be selected, and only the first cutting unit or the second cutting unit is controlled to work according to the grass height of the area to be cut, so that the energy consumption is reduced.

Drawings

Fig. 1 shows a schematic structural view of a lawnmower according to a first embodiment of the present application.

Fig. 2 shows a bottom view of a lawn mower according to a first embodiment of the present application.

Fig. 3 shows a bottom view of a lawn mower according to a second embodiment of the present application.

Fig. 4 shows a bottom view of a lawn mower according to a third embodiment of the present application.

Fig. 5 shows a bottom view of a lawn mower according to a fourth embodiment of the present application.

Fig. 6 shows a schematic view of a working path of a lawn mower according to a third embodiment of the present application.

Description of the reference numerals

1 casing

2 travelling wheel

3 first cutting unit 31 first motor 32 first cutter head 33 first blade

4 second cutting unit 41 second motor 42 second cutter disc 43 second blade

S1 first cutting region

S2 second cutting zone

The X longitudinal direction, the Y width direction and the Z height direction.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.

In the prior art, under the condition that the rotary cutter with the flanging is used, the energy consumption is high although the cutting effect is good when the grass with the long cutting length is cut, and the motor stalling is caused by the easy winding of the rotary cutter without the flanging when the rotary cutter without the flanging is used.

In view of the above, as shown in fig. 1 to 3, the present application proposes a lawn mower comprising at least one first cutting unit 3 and at least one second cutting unit 4, the first cutting unit 3 and the second cutting unit 4 being respectively used for cutting grass. The first cutting unit 3 is configured to form a first cutting area S1 at a first level, the first cutting unit 3 being capable of cutting grass entering the first cutting area S1. The second cutting unit 4 is configured to form a second cutting area S2 at a second height, the second cutting unit 4 being capable of cutting grass entering the second cutting area S2. The first cutting unit 3 and the second cutting unit 4 are arranged along the length direction X of the mower, and the first height is different from the second height.

When the mower works, the mower can be controlled to walk once along the length direction X of the mower, so that long grass on the walking path can be cut by the first cutting unit 3 and the second cutting unit 4 at different heights, the grass is cut short and chopped, no repeated path exists in the walking path, and the cutting time can be greatly saved while the cutting effect is ensured.

In a possible embodiment, as shown in fig. 1, the first cutting unit 3 is located at the front side of the second cutting unit 4, and normally the side where the universal wheels of the lawn mower are located appears as the front side of the lawn mower, i.e., the left side in fig. 1 to 3 is the front side of the lawn mower. In the height direction Z of the lawn mower, the second cutting zone S2 is located below the first cutting zone S1, i.e. the distance of the second cutting zone S2 from the ground is smaller than the distance of the first cutting zone S1 from the ground. The second cutting zone S2 may be located entirely below the first cutting zone S1, or the second cutting zone S2 may be located partially below the first cutting zone S1, such that the projections of the first cutting zone S1 and the second cutting zone S2 along the length direction X of the lawn mower on a plane perpendicular to the length direction X of the lawn mower have overlapping portions.

By providing the first cutting unit 3 and the second cutting unit 4 having different heights in the length direction X of the lawnmower, when the lawnmower travels forward a single time in the length direction X of the lawnmower (for example, a single straight travel), for the same area along the travel path, the longer grass can be cut short by the first cutting unit 3 first, and then the second cutting unit 4 performs the cutting operation, thereby further cutting the longer grass. Therefore, long grass in the preset area can be cut for multiple times to cut the grass into pieces and short, no repeated path exists in the walking path, and cutting time can be greatly saved while the cutting effect is ensured.

In one possible embodiment, as shown in fig. 2, the first cutting unit 3 and the second cutting unit 4 are arranged at intervals along the length direction X of the mower, i.e. the projections of the first cutting area S1 and the second cutting area S2 on the ground along the height direction Z of the mower have no overlapping part, thereby facilitating grass discharge during cutting and facilitating the cut grass to fall on the ground.

In one possible embodiment, as shown in fig. 2, the first cutting unit 3 may be provided in plurality, the plurality of first cutting units 3 being arranged in the width direction Y of the lawnmower, the first cutting zones S1 of the plurality of first cutting units 3 being at the same height, such that the plurality of first cutting zones S1 are at the same height in the height direction Z of the lawnmower; and/or the second cutting unit 4 may be provided in plurality, the plurality of second cutting units 4 being arranged in the width direction Y of the lawnmower, the second cutting zones S2 of the plurality of second cutting units 4 being of the same height. Alternatively, as shown in fig. 2, the first cutting unit 3 and the second cutting unit 4 are each provided in two in the Y direction. Alternatively, as shown in fig. 3, three first cutting units 3 and three second cutting units 4 are provided in the Y direction. By arranging the plurality of first cutting units 3 and/or the plurality of second cutting units 4 in the width direction Y of the lawnmower, the first cutting zone S1 and/or the second cutting zone S2 can be made to cover a wider area in the width direction Y of the lawnmower, thereby increasing the width of the cutting zone; in addition, since the first cutting sections S1 of the plurality of first cutting units 3 have the same height, the plurality of first cutting sections S1 can be made to have the same height in the height direction Z of the lawnmower, the second cutting sections S2 of the plurality of second cutting units 4 can be made to have the same height in the height direction Z of the lawnmower, and the cutting flatness of the lawn can be improved.

In another possible embodiment, the projections of the first cutting area S1 and the second cutting area S2 on the ground in the height direction Z of the mower have a partial overlapping area, so that the chassis space of the mower can be fully utilized, the plurality of cutting units can be arranged compactly, and a proper number of first cutting units 3 and second cutting units 4 can be arranged. The skilled person can select the number of the first cutting unit 3 and the second cutting unit 4 according to practical situations, which is not limited in this application.

In a possible embodiment, as shown in fig. 2, the first cutting zones S1 of adjacent first cutting units 3 have overlapping portions in projection on a plane perpendicular to the length direction X of the lawn mower along the length direction X of the lawn mower, for example, the two first cutting zones may slightly overlap, so that the elongated areas formed by extending adjacent two first cutting zones S1 along the length direction X of the lawn mower have overlapping portions. The projections of the second cutting zones S2 of adjacent second cutting units 4 in the length direction X of the lawn mower onto a plane perpendicular to the length direction X of the lawn mower have overlapping portions, for example, they may slightly overlap, so that the elongated zones formed by the extension of two adjacent second cutting zones S2 in the length direction X of the lawn mower have overlapping portions. When the lawn mower travels in the longitudinal direction X of the lawn mower, the first cutting unit 3 may cut the lawn in a portion between two adjacent first cutting areas S1, and the second cutting unit 4 may cut the lawn in a portion between two adjacent second cutting areas S2. In this way, it is possible to prevent missing cutting of the portion between the adjacent two first cutting units 3 and the adjacent two second cutting units 4 while increasing the mowing width of the lawnmower. It will be appreciated that the projections of the first cutting zones S1 of the plurality of first cutting units 3 in the height direction Z of the lawnmower may not overlap, thereby facilitating grass discharge during cutting and facilitating the cut grass to fall onto the ground.

In a possible embodiment, as shown in fig. 1, the first cutting unit 3 comprises a first motor 31, a first blade disc 32 and a plurality of sets of first blades 33, wherein each set of first blades 33 is mounted to the first blade disc 32 at intervals in the height direction Z of the lawn mower. The second cutting unit 4 comprises a second motor 41, a second cutter disc 42 and a plurality of sets of second blades 43, wherein each set of second blades 43 is mounted to the second cutter disc 42 at intervals along the height direction Z of the mower. The second cutting unit 4 and the first cutting unit 3 are installed at different positions, and the specific structures of the two may be the same, so only the specific structure of the first cutting unit 3 will be described in detail below, and detailed description of the specific structure of the second cutting unit 4 will not be repeated.

Alternatively, the first knife disc 32 is connected to an output shaft of the first motor 31, and the first motor 31 can drive the first knife disc 32 to rotate. It will be appreciated that the first cutter head 32 may be connected, but is not limited to, to the output shaft of the first motor 31 via a suitable speed reduction mechanism. The first blade 33 is mounted to the first cutter head 32. The output shaft of the first motor 31 extends along the height direction Z of the mower, and when the first blade 33 is driven by the first blade disc 32 to rotate in the horizontal plane, the first blade 33 forms an annular first cutting area S1 at a first height, and the first cutting unit 3 can cut grass entering the first cutting area S1. When the lawnmower travels in the longitudinal direction X, the lawn can be cut in the strip-shaped region.

The first cutter 33 may be mounted to a peripheral portion of the first cutter disc 32, the first cutter disc 32 mounting a plurality of sets of the first cutter 33, for example, the first cutter disc 32 may mount 3 sets of the first cutter 33. The 3 sets of first blades 33 are spaced apart in the height direction Z of the mower, and each set of first blades 33 can be used to cut grass of different heights, or different height positions of the grass.

Since the first cutting unit 3 and the second cutting unit 4 each have a plurality of sets of blades staggered in the height direction of the lawnmower, a single pass of the lawnmower through the predetermined area can cause longer grass in the predetermined area to be cut multiple times. The grass is cut up by cutting the grass for multiple times, so that the motor is not easy to block, the grass can be cut up and cut short by passing through a preset area once, and the working efficiency is high.

In a possible embodiment, the cutting radius of each set of first blades 33 increases progressively and the cutting radius of each set of second blades 43 increases progressively, in a direction away from the ground in the height direction Z of the mower. Taking the example shown in fig. 1, in the plurality of sets of first blades 33, the working radius of the first blade 33 located above is larger than the working radius of the first blade 33 located below; the dimension of the first blade 33 located above in the radial direction of the first cutter 32 is larger than the dimension of the first blade 33 located below in the radial direction of the first cutter 32. The first cutting area S1 formed by the rotation of the first blade 33 may be tapered or stepped when the first cutter disc 32 rotates. When the mower travels forward along the length direction X of the mower, the longer grass can be cut by the first blade 33 located above and then by the first blade 33 located below, so that the longer grass can be cut many times to cut the grass.

In one possible embodiment, as shown in fig. 2 and 3, the first blades 33 in each set of first blades 33 may have a plurality, for example, 3, and the 3 first blades 33 may be uniformly mounted to the first cutter head 32 at intervals in the circumferential direction of the first cutter head 32. The first blade 33 is in a sheet shape, and the first blade 33 is cut a plurality of times by moving the grass upward by the updraft without forming a burring portion that provides the updraft when rotating. The windward area of the first blade 33 is small, and the wind resistance is small when the first cutter head 32 rotates, so that the first motor 31 with low power can be selected, and the energy consumption of the mower is low. It will be appreciated that a plurality (e.g., 3) of first blades 33 having different radii may be mounted to the same location of the first cutter head 32 by a mounting mechanism. In this way, the mounting structure and the mounting step of the plurality of first blades 33 can be simplified.

In addition, a plurality of first blades 33 having different heights, which are located at the same (circumferential) position of the first blade disc 32, may also be referred to as a set of first blades. In this way, the first cutting unit 3 may have one or more sets of first blades 33 having a plurality of first blades 33 of different heights. In the case of having a plurality of sets of first blades 33, the plurality of sets of first blades 33 are preferably distributed at equal intervals in the circumferential direction of the first cutter head 32.

It can be understood that the above two blade grouping ways do not affect the installation, working process and effect of the blades of the present invention.

In one possible embodiment, the mower may comprise a frame, which may be a structural body of the mower.

Preferably, the first cutting unit 3 is configured to be mounted to the housing and/or frame of the lawn mower with an adjustable mounting height in the height direction Z of the lawn mower; the second cutting unit 4 is configured to be mounted to the housing and/or the frame of the lawn mower with an adjustable mounting height in the height direction Z of the lawn mower. This allows the mower to be adapted to different grass conditions, particularly lawns having different grass lengths. Specifically, for example, the height adjustment of the first cutting unit 3 may be performed by adjusting the mounting height of the first motor 31 to the housing 1 or by adjusting the mounting height of the first blade 33 to the first cutter 32. The height adjustment function can be realized by a link mechanism or a screw mechanism.

In a possible embodiment, the lawn mower further comprises a first drive unit for driving the first cutting unit 3, and a second drive unit for driving the second cutting unit 4; alternatively, the mower further comprises driving means comprising a clutch for alternatively or simultaneously driving the first cutting unit 3 and said second cutting unit 4. The clutch may control the first cutting unit 3 and the second cutting unit 4 to be driven simultaneously or alternatively. Depending on the actual situation, the first cutting unit 3 and the second cutting unit 4 can be operated simultaneously, or only one of the first cutting unit 3 and the second cutting unit 4 can be operated. For example, when the length of grass is short, it is possible to operate only the second cutting unit 4, thereby reducing energy consumption.

The application also provides a control method of the mower, which comprises the following steps:

s100, obtaining the grass height of the area to be cut, wherein the grass height of the area to be cut comprises the average grass height or the maximum grass height of the area to be cut.

The method for acquiring the grass height of the area to be cut can be that the mower automatically acquires the grass height through a sensor (such as a capacitance sensor or an ultrasonic sensor) or a user acquires the grass height through other methods.

S200, judging whether the grass height of the area to be cut is larger than or equal to a preset grass height, and if so, controlling the first cutting unit 3 and the second cutting unit 4 to work simultaneously; if not, the first cutting unit 3 or the second cutting unit 4 is controlled to work.

The preset grass height may be a grass height of a lawn desired by a user, and whether the grass height of the area to be cut is greater than or equal to the preset grass height may be determined automatically by the lawn mower or by the user, and then the working modes of the first cutting unit 3 and the second cutting unit 4 are set automatically by the lawn mower or manually by the user.

With the control method of the lawn mower, the operation mode can be selected according to the actual grass height condition, the first cutting unit 3 and the second cutting unit 4 can be operated simultaneously, or only one of the first cutting unit 3 and the second cutting unit 4 can be operated. For example, when the grass height is less than the preset grass height, only the second cutting unit 4 may be operated, thereby reducing power consumption.

As shown in fig. 4, the present application also proposes a lawn mower comprising at least one first cutting unit 3 and at least one second cutting unit 4, the first cutting unit 3 being configured to form a first cutting zone S1 at a first height, the first cutting unit 3 being capable of cutting grass entering the first cutting zone S1. The second cutting unit 4 is configured to form a second cutting area S2 at a second height, the second cutting unit 4 being capable of cutting grass entering the second cutting area S2. The second cutting unit 4 is arranged in the width direction Y of the lawn mower from the first cutting unit 3, and the first height is different from the second height.

By arranging the first cutting unit 3 and the second cutting unit 4 with different heights in the width direction Y of the mower, the mower can walk once in a preset area according to a planned path, so that longer grass in the preset area can be cut at different heights, the grass can be cut short and chopped, no repeated path exists in the walking path, and the cutting time can be greatly saved while the cutting effect is ensured.

In a possible embodiment, as shown in fig. 5, in order to reduce the interference between the first cutting unit 3 and the second cutting unit 4 and at the same time make the grass cut by the first cutting unit 3 and the second cutting unit 4 easier to fall to the ground, the second cutting unit 4 may be offset from the first cutting unit 3 in the width direction Y of the mower in the length direction X of the mower, i.e. so that the second cutting unit 4 is spaced from the first cutting unit 3 in the projection of the height direction Z of the mower on the ground.

Optionally, along the length direction (X) of the mower, the axis of the first cutting zone (S1) has a first projection on a plane perpendicular to the length direction (X) of the mower, and the axis of the second cutting zone (S2) has a second projection on a plane perpendicular to the length direction (X) of the mower; wherein the perpendicular distance of the first projection from the second projection is less than or equal to the sum of the radii of the first cutting region (S1) and the second cutting region (S2). In this way, when the lawnmower travels in the longitudinal direction X of the lawnmower, the lawnmower can cut the lawn in the portion between the first cutting area S1 and the second cutting area S2, thereby preventing missed cutting and improving the final cutting flatness of the lawn.

The first cutting unit 3 is configured to be mounted to the housing and/or the frame of the lawn mower with an adjustable mounting height in the height direction Z of the lawn mower. The second cutting unit 4 is configured to be mounted to the housing and/or the frame of the lawn mower with an adjustable mounting height in the height direction Z of the lawn mower. Therefore, the mower can change the height of the first cutting area S1 and the height of the second cutting area S2, and flexibly cope with the conditions of different grass heights.

In a possible embodiment, the first cutting unit 3 and the second cutting unit 4 may each be provided in plurality, the plurality of first cutting units may be arranged along the length direction X of the lawn mower, and the plurality of second cutting units may be arranged along the length direction X of the lawn mower. When the mower runs along the length direction X of the mower, the grass can be cut for multiple times by the first cutting units and the second cutting units, and the phenomenon of missed cutting is reduced.

Fig. 6 shows a schematic view of the working path of the lawn mower of the embodiment shown in fig. 4. As shown in fig. 6, the area within the dashed rectangle represents the area a to be cut, the mower follows the planned path L for a single walk, and the first cutting area S1 and the second cutting area S2 are located on both sides of the planned path L.

When the lawnmower travels along the planned path L from one side (lower side in fig. 6) of the area a to be cut to the other side (upper side in fig. 6), the head of the lawnmower can be made to travel forward, and the first part A1 of the area a to be cut is cut by the first cutting unit 3 first. When the mower travels along the planned path L from the other side (upper side in fig. 6) of the area a to be cut to one side (lower side in fig. 6) of the area a to be cut, the tail of the mower can be caused to travel forward (backward), at this time, the first part A1 of the area a to be cut is cut by the second cutting unit 4, and the second part A2 of the area a to be cut is cut by the first cutting unit 3. By doing so, each part of the area a to be cut can be cut by the first cutting unit 3 and the second cutting unit 4, respectively, that is, in the process of a single walk of the mower along the planned path L, the same area can be cut once by the first cutting unit 3 and the fourth cutting unit 4, so that the longer grass in the area a to be cut can be cut for a plurality of times, and the grass can be cut up and short.

It can be understood that the mower can combine head-forward driving and tail-forward driving during walking, such as changing the driving direction during the sharp corner turning of fig. 6, and changing the head-forward driving into the tail-forward driving; it is also possible to always drive the head or the tail forward and adjust the heights of the first cutting unit 3 and the second cutting unit 4 after a u-turn and change the heights of the first cutting area S1 and the second cutting area S2 so that each part of the area a to be cut is cut by the first cutting unit 3 or the second cutting unit 4 at different heights.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

While the present application has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any limiting meaning for the present application.

Claims

1. A lawnmower, characterized in that it comprises:

at least one first cutting unit (3), the first cutting unit (3) being configured to form a first cutting region (S1) at a first height; and

at least one second cutting unit (4), the second cutting unit (4) being arranged with the first cutting unit (3) along a length direction (X) of the lawn mower, and the second cutting unit (4) being configured to form a second cutting zone (S2) at a second height;

wherein the first height is different from the second height.

2. A lawn mower as claimed in claim 1, characterized in that the second cutting unit (4) is arranged at a distance from the first cutting unit (3) in the length direction (X) of the lawn mower.

3. The mower of claim 1,

the first cutting unit (3) is provided in plurality, the plurality of first cutting units (3) are arranged in a width direction (Y) of the lawn mower, and the first cutting areas (S1) of the plurality of first cutting units (3) are the same in height; and/or the presence of a gas in the atmosphere,

the second cutting unit (4) is provided in plurality, the plurality of second cutting units (4) are arranged in a width direction (Y) of the lawn mower, and the second cutting zones (S2) of the plurality of second cutting units (4) are equal in height.

4. The mower of claim 3,

-the first cutting zones (S1) of adjacent first cutting units (3) have overlapping portions in a projection of the length direction (X) of the lawn mower onto a plane perpendicular to the length direction (X) of the lawn mower;

the projections of the second cutting zones (S2) of adjacent second cutting units (4) in the length direction (X) of the lawn mower onto a plane perpendicular to the length direction (X) of the lawn mower have overlapping portions.

5. The mower of claim 1,

the first cutting unit (3) comprises a first cutter disc (32) and a plurality of groups of first blades (33), wherein the first blades (33) of each group are arranged on the first cutter disc (32) at intervals along the height direction (Z) of the mower;

the second cutting unit (4) comprises a second cutter disc (42) and a plurality of groups of second blades (43), wherein the second blades (43) of each group are arranged on the second cutter disc (42) at intervals along the height direction (Z) of the mower.

6. A lawnmower as claimed in claim 5, wherein the cutting radius of each group of the first blades (33) increases progressively and the cutting radius of each group of the second blades (43) increases progressively in a direction away from the ground in the height direction (Z) of the lawnmower.

7. The mower of claim 1,

the first cutting unit (3) is configured to be mounted to a housing and/or a chassis of the lawn mower with an adjustable mounting height in a height direction (Z) of the lawn mower;

the second cutting unit (4) is configured to be mounted to a housing and/or a frame of the lawn mower with an adjustable mounting height in a height direction (Z) of the lawn mower.

8. The mower of claim 1,

the lawn mower further comprises a first driving unit for driving the first cutting unit (3), and a second driving unit for driving the second cutting unit (4); or,

the mower further comprises a drive device comprising a clutch for alternatively or simultaneously driving the first cutting unit (3) and the second cutting unit (4).

9. A lawnmower, characterized in that it comprises:

at least one second cutting unit (4), the second cutting unit (4) being arranged with the first cutting unit (3) in a width direction (Y) of the lawn mower, and the second cutting unit (4) being configured to form a second cutting zone (S2) at a second height;

wherein the first height is different from the second height.

10. The mower of claim 9,

-along a length direction (X) of the mower, the axis of the first cutting zone (S1) has a first projection on a plane perpendicular to the length direction (X) of the mower, and the axis of the second cutting zone (S2) has a second projection on a plane perpendicular to the length direction (X) of the mower;

wherein the perpendicular distance of the first projection from the second projection is smaller than or equal to the sum of the radii of the first cutting region (S1) and the second cutting region (S2).

11. The mower of claim 9,

12. A method of controlling a lawnmower according to any one of claims 1 to 11,

obtaining the grass height of a region to be cut;

judging whether the grass height of the area to be cut is greater than or equal to a preset grass height, if so, controlling the first cutting unit (3) and the second cutting unit (4) to work simultaneously; if not, controlling the first cutting unit (3) or the second cutting unit (4) to work.

13. The method of controlling a lawnmower according to claim 12, wherein the grass height of the area to be cut comprises an average grass height or a maximum grass height of the area to be cut.