阅读说明：本技术 一种具有自动清除杂物功能的割草装置 (Mowing device with automatic sundry removing function ) 是由 张冰 邱绪云 尚冉琦 宋裕民 高琦 徐高伟 于 2020-12-21 设计创作，主要内容包括：本发明公开了一种具有自动清除杂物功能的割草装置,其中,包括框架,所述框架上设有多个梳理齿；所述梳理齿的上端与所述框架前端的下侧面固定连接,多个所述梳理齿之间间隔设置；且在横向上沿一个方向到另一方向,所述梳理齿逐渐向后分布；所述梳理齿为S形结构,其沿从上到下的方向依次包括第一弧形杆、直杆和第二弧形杆,所述第一弧形杆对应的曲率圆的圆心位于所述第一弧形杆的后方,所述第二弧形杆对应的曲率圆的圆心位于所述第二弧形杆的前方。本发明能够在割草的同时,对可能造成割刀损坏的杂物进行清理。(The invention discloses a mowing device with an automatic sundry removing function, which comprises a frame, wherein a plurality of combing teeth are arranged on the frame; the upper ends of the carding teeth are fixedly connected with the lower side face of the front end of the frame, and a plurality of carding teeth are arranged at intervals; and in the transverse direction from one direction to the other, the carding teeth are gradually distributed backwards; the carding teeth are of S-shaped structures and sequentially comprise first arc-shaped rods, straight rods and second arc-shaped rods from top to bottom, the circle centers of curvature circles corresponding to the first arc-shaped rods are located behind the first arc-shaped rods, and the circle centers of curvature circles corresponding to the second arc-shaped rods are located in front of the second arc-shaped rods. The mowing machine can mow and clean sundries which may cause damage to the cutting knife.)

1. The utility model provides a grass cutting device with automatic clear debris function which characterized in that: comprises a frame (1), wherein a plurality of carding teeth (2) are arranged on the frame (1);

the upper ends of the carding teeth (2) are fixedly connected with the lower side surface of the front end of the frame (1), and a plurality of carding teeth (2) are arranged at intervals; and in the transverse direction from one direction to the other, the carding teeth (2) are gradually distributed backwards;

the carding teeth (2) are of S-shaped structures and sequentially comprise first arc-shaped rods (3), straight rods (4) and second arc-shaped rods (5) in the direction from top to bottom, the circle centers of curvature circles corresponding to the first arc-shaped rods (3) are located behind the first arc-shaped rods (3), and the circle centers of curvature circles corresponding to the second arc-shaped rods (5) are located in front of the second arc-shaped rods (5).

2. The mowing device with the function of automatically removing sundries according to claim 1, wherein: the first arc-shaped rod (3) is tangent to the straight rod (4) and is fixedly connected with the straight rod;

the lower end of the straight rod (4) is provided with two parallel connecting lugs (6), and the surface where the connecting lugs (6) are located is parallel to the surface where the central line of the carding teeth (2) is located;

a rotating shaft (7) is arranged at the upper end of the second arc-shaped rod (5), and two ends of the rotating shaft (7) are respectively and rotatably connected with the two connecting lugs (6) at the lower end of the same straight rod (4); the bottom of the lower end of the second arc-shaped rod (5) is provided with a roller (8);

an angle spring is arranged at the rotating shaft (7) so that the roller (8) can be in contact with the ground when the mowing device works;

an angle sensor is arranged at the rotating shaft (7); the angle sensor is used for acquiring the lifted angle of the second arc-shaped rod (5), so that the height of the ground bulge can be acquired through the lifted angle of the second arc-shaped rod (5).

3. The mowing device with the function of automatically removing sundries according to claim 2, wherein: also comprises a cutting mechanism (10);

the cutting mechanism (10) is arranged between two adjacent carding teeth (2) in a sliding manner, and the cutting mechanism (10) is positioned at the straight rod (4) or the first arc-shaped rod (3);

the cutting mechanism (10) is used for cutting weeds which are combed by the combing teeth (2) and between two adjacent combing teeth (2).

4. The mowing device with the function of automatically removing sundries according to claim 3, wherein: the telescopic rod type electric heating device also comprises a mounting plate (11) and a telescopic rod (12);

the mounting plate (11) is fixedly mounted on the first arc-shaped rod (3), and the mounting plate (11) is positioned on one side, close to the circle center of the curvature circle, of the first arc-shaped rod (3);

one end of the telescopic rod (12) is hinged with the cutting mechanism (10), and the other end of the telescopic rod (12) is hinged with the two adjacent mounting plates (11);

the telescopic rod (12) is arranged for driving the cutting mechanism (10) to slide, so that the lowest point of the cutting mechanism (10) is higher than the height of the ground bulge.

5. The mowing device with the function of automatically removing sundries according to claim 3, wherein: two opposite side surfaces of two adjacent carding teeth (2) are respectively provided with a sliding chute (13); the sliding groove (13) is positioned on the straight rod (4); the length directions of the sliding grooves (13) are consistent;

the cutting mechanism (10) comprises a sliding plate (14), a knife board (15), a rotary driving piece (16) and a blade (17);

two sides of the sliding plate (14) are respectively and slidably arranged in the sliding grooves (13) of two adjacent carding teeth (2), and the cutting board (15) is fixed on the front side of the sliding plate (14); the rotary driving part (16) is arranged on the upper surface of the knife board (15), a plurality of blades (17) are arranged, and the plurality of blades (17) are fixedly connected with a driving shaft of the rotary driving part (16); the driving shaft penetrates through the knife board (15), and the upper surface of the blade (17) is attached to the lower plane of the knife board (15).

6. The mowing device with the function of automatically removing sundries according to claim 5, wherein: the width of the knife board (15) is gradually increased along the front-to-back aspect;

the knife board (15) gradually shrinks inwards along the direction from bottom to top;

the blade (17) is gradually contracted inward in the direction from top to bottom.

7. The mowing device with the function of automatically removing sundries according to claim 1, wherein: the width of the carding teeth (2) is gradually increased along the direction from front to back.

8. The mowing device with the function of automatically removing sundries according to any one of claims 3 to 7, wherein: also comprises a first protection plate (18);

the first protection plates (18) correspond to the carding teeth (2) one by one, and the first protection plates (18) are arranged at the lower end of the straight rod (4) and extend forwards horizontally;

the width of the first protection plate (18) is gradually increased along the direction from front to back.

9. The mowing device with the function of automatically removing sundries according to claim 1, wherein: the novel protective device is characterized by further comprising a second protective plate, wherein the second protective plate covers the first arc-shaped rods (3) so that gaps between the adjacent first arc-shaped rods (3) are shielded.

10. The mowing device with the function of automatically removing sundries according to claim 1, wherein: further comprising a conveying structure (20);

the conveying structure (20) comprises a rotating wheel (21) and a shifting lever (19);

the rotating wheel (21) is rotatably arranged in the upper front of the frame (1), and the rotating center of the rotating wheel (21) is horizontally and transversely arranged; the deflector rods (19) are uniformly distributed on the periphery of the rotating wheel (21) along multiple rows;

the poking rod (19) is used for poking the cut weeds above the frame (1) when rotating along with the rotating wheel (21).

Technical Field

The invention relates to the technical field of mowing, in particular to a mowing device with an automatic sundry removing function.

Background

In the nursing process of orchards and grasslands, a mower is usually needed.

In orchards, lawns, there are often sundries such as stones, branches, etc. The sundries can not be cleaned in time, so that the mower is easy to be seriously damaged.

In the prior art, a layer of protective shell is usually arranged on the periphery of a cutting knife to prevent impurities such as stones from entering a working area of the cutting knife so as to prevent the impurities such as the stones from colliding with the cutting knife to damage the cutting knife. On some small lawnmowers, the operator typically observes and controls to prevent the blade from hitting the rock.

To setting up protective housing and preventing the mode that the stone damaged the cutting knife, because the ground in meadow or orchard is comparatively loose, at protective housing and the in-process that the cutting knife removed together, slightly be greater than the stone of distance between protective housing and the ground to the size, still exist and be drawn into the situation in the cutting knife, and at the in-process of work, the stone is in case drawn into in the cutting knife, is difficult to discharge, until the stone is smashed, this will cause very serious damage to the cutting knife. The second mode is a manual identification mode, which is not suitable for a large-sized mower, especially for an unmanned or remote mower.

Therefore, how to clean up sundries which may cause damage to the cutting knife while mowing is one of the important problems to be solved urgently in the field.

Disclosure of Invention

The invention aims to provide a mowing device with an automatic sundry removing function, which can be used for solving the defects in the prior art and cleaning sundries which possibly cause damage to a cutting knife while mowing.

The invention provides a mowing device with an automatic sundry removing function, which comprises a frame, wherein a plurality of combing teeth are arranged on the frame;

the upper ends of the carding teeth are fixedly connected with the lower side face of the front end of the frame, and a plurality of carding teeth are arranged at intervals; and in the transverse direction from one direction to the other, the carding teeth are gradually distributed backwards;

the carding teeth are of S-shaped structures and sequentially comprise first arc-shaped rods, straight rods and second arc-shaped rods from top to bottom, the circle centers of curvature circles corresponding to the first arc-shaped rods are located behind the first arc-shaped rods, and the circle centers of curvature circles corresponding to the second arc-shaped rods are located in front of the second arc-shaped rods.

The mowing device with the function of automatically removing sundries as described above, wherein optionally, the first arc-shaped rod is tangent to the straight rod and is fixedly connected with the straight rod;

the lower end of the straight rod is provided with two parallel connecting lugs, and the surface where the connecting lugs are arranged is parallel to the surface where the center line of the carding teeth is arranged;

a rotating shaft is arranged at the upper end of the second arc-shaped rod, and two ends of the rotating shaft are respectively and rotatably connected with the two connecting lugs at the lower end of the same straight rod; the bottom of the lower end of the second arc-shaped rod is provided with a roller;

an angle spring is arranged at the rotating shaft, so that the roller can be in contact with the ground when the mowing device works;

an angle sensor is arranged at the rotating shaft; the angle sensor is used for acquiring the lifted angle of the second arc-shaped rod, so that the height of the ground bulge can be acquired through the lifted angle of the second arc-shaped rod.

The mowing device with the function of automatically clearing sundries as described above optionally further comprises a cutting mechanism;

the cutting mechanism is arranged between two adjacent carding teeth in a sliding mode and is positioned at the straight rod or the first arc-shaped rod;

the cutting mechanism is used for cutting weeds which are combed by the combing teeth and between two adjacent combing teeth.

The mowing device with the function of automatically removing sundries as described above optionally further comprises a mounting plate and a telescopic rod;

the mounting plate is fixedly mounted on the first arc-shaped rod and is positioned on one side, close to the center of a curvature circle, of the first arc-shaped rod;

one end of the telescopic rod is hinged with the cutting mechanism, and the other end of the telescopic rod is hinged with the two adjacent mounting plates;

the telescopic rod is arranged for driving the cutting mechanism to slide, so that the lowest point of the cutting mechanism is higher than the height of the ground bulge.

The mowing device with the function of automatically removing sundries is characterized in that the two opposite side surfaces of two adjacent combing teeth are respectively provided with a sliding groove; the sliding groove is positioned on the straight rod; the length directions of the sliding grooves are consistent;

the cutting mechanism comprises a sliding plate, a knife board, a rotary driving piece and a blade;

two sides of the sliding plate are respectively and slidably arranged in the sliding grooves of two adjacent carding teeth, and the cutting board is fixed on the front side of the sliding plate; the rotary driving part is arranged on the upper surface of the cutting board, a plurality of blades are arranged, and the plurality of blades are fixedly connected with a driving shaft of the rotary driving part; the driving shaft penetrates through the knife board, and the upper surface of the blade is attached to the lower plane of the knife board.

The mowing device with the automatic sundry removing function is characterized in that the width of the knife board is gradually increased along the front-to-back direction;

the knife plate gradually shrinks inwards along the direction from bottom to top;

the blades are gradually retracted inwardly in the top-to-bottom direction.

The grass cutting device with the automatic sundries removing function is characterized in that the width of the combing teeth is gradually increased from front to back.

The mowing device with the function of automatically clearing sundries as described above optionally further comprises a first protection plate;

the first protection plates correspond to the carding teeth one by one, are arranged at the lower end of the straight rod and extend forwards horizontally;

the width of the first protection plate is gradually increased along the direction from front to back.

The mowing device with the function of automatically clearing sundries as described above optionally further comprises a second protection plate, wherein the second protection plate covers the first arc-shaped rods, so that gaps between the adjacent first arc-shaped rods are shielded.

The mowing device with the function of automatically clearing sundries as described above optionally further comprises a conveying structure;

the conveying structure comprises a rotating wheel and a driving lever;

the rotating wheel is rotatably arranged in the upper front of the frame, and the rotating center of the rotating wheel is horizontally and transversely arranged; the deflector rods are uniformly distributed on the periphery of the rotating wheel along a plurality of rows;

the rotating wheel is used for poking the cut weeds to the upper part of the frame when rotating along with the rotating wheel.

Compared with the prior art, the invention has at least the following beneficial effects:

1. by providing a plurality of comb teeth on the underside of the front end of the frame, a plurality of said comb teeth are distributed progressively rearwards in the transverse direction. In the using process, as the mowing device advances, stone or other sundries on the ground can generate transverse component force after encountering the combing teeth to promote the sundries to be gradually moved to one side of the frame, so that the damage of the sundries to the cutting knife can be avoided;

2. through the arrangement of the carding teeth, grass to be cut can be straightened between the adjacent carding teeth; so as to be convenient for cutting by matching with the cutting mechanism provided by the invention.

3. The carding teeth are arranged in an S shape, particularly, the circle center of a curvature circle corresponding to the second arc-shaped rod is positioned in front of the second arc-shaped rod, so that the second arc-shaped rod can have a smaller cutting angle when encountering sundries such as stones, the stones can be conveniently moved above the second arc-shaped rod, and then a transverse component force is generated by matching with the arrangement characteristics of the second arc-shaped rod to move the stones to one side of the frame, so that the function of removing the sundries is achieved;

4. the straight rod is rotatably connected with the second arc-shaped rod, and the roller is arranged at the bottom of the lower end of the second arc-shaped rod, so that the second arc-shaped rod can be automatically lifted when the second arc-shaped rod meets the terrain such as a raised soil bag, the second arc-shaped rod is prevented from being inserted into the soil bag, and the second arc-shaped rod can be ensured to smoothly pass through the terrain such as the soil bag;

5. the second arc-shaped rod is lifted up due to the contact of the roller with the ground. According to the lifting angle of the second arc-shaped rod, the height of the ground can be calculated. The cutting mechanism can be matched with the characteristic that the cutting mechanism can slide along the carding teeth, and the cutting height can be controlled according to the calculated height value, so that the cutting mechanism can be adaptively adjusted according to the terrain.

6. Due to the design of the carding teeth, sundries can be removed. The structure is particularly suitable for the requirements of remote control operation, unmanned operation and the like of the existing agricultural machinery.

The above effects are only partial effects of the present invention, and specific reference is made to the embodiments.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a perspective view of the cutting mechanism of the present invention;

FIG. 4 is a schematic view of a proposed carding tooth structure;

FIG. 5 is a schematic view of the connection structure of a straight rod and a second arc-shaped rod according to the present invention;

fig. 6 is a schematic diagram of the calculation of the lifting height of the second curved bar according to the invention.

Description of reference numerals:

1-frame, 2-carding teeth, 3-first arc-shaped rod, 4-straight rod, 5-second arc-shaped rod, 6-connecting lug, 7-rotating shaft, 8-roller, 9-limiting structure, 10-cutting mechanism, 11-mounting plate, 12-telescopic rod, 13-sliding groove, 14-sliding plate, 15-knife plate, 16-rotary driving piece, 17-blade, 18-first protection plate, 19-deflector rod, 20-conveying structure and 21-rotating wheel.

Detailed Description

The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1 to 6, the present invention provides a mowing device with an automatic debris removing function, wherein the mowing device comprises a frame 1, the frame 1 is used for supporting the whole mowing device, and the frame 1 is used for being connected with a driving mechanism, for example, the frame can be arranged at the front end of a tractor.

Specifically, a plurality of carding teeth 2 are arranged on the frame 1; the carding teeth 2 are used for carding the grass to be cut and screening out stones on the ground. The upper ends of the carding teeth 2 are fixedly connected with the lower side surface of the front end of the frame 1, and a plurality of carding teeth 2 are arranged at intervals; and in the transverse direction from one direction to the other, the comb teeth 2 are distributed gradually backwards. For example, the distribution of the comb teeth 2 may be in a left-to-right direction, with the comb teeth 2 being disposed gradually rearward. Therefore, when sundries such as stones exist on the ground, the sundries are firstly screened out by the carding teeth 2. Because the combing teeth 2 move forwards and the arrangement of the combing teeth is characterized in that the combing teeth are gradually arranged backwards from one direction to the other direction along the transverse direction, a transverse component force can be generated on the stone block so as to enable the stone block to move to one side. Specifically, in the present invention, the front, rear, left, and right are referred to with the direction in which the tractor travels as the front.

The carding teeth 2 are of S-shaped structures and sequentially comprise first arc-shaped rods 3, straight rods 4 and second arc-shaped rods 5 from top to bottom, the circle centers of curvature circles corresponding to the first arc-shaped rods 3 are located behind the first arc-shaped rods 3, and the circle centers of curvature circles corresponding to the second arc-shaped rods 5 are located in front of the second arc-shaped rods 5.

Further, in order to improve the cleaning effect on the stone, the front side surface of the second arc-shaped rod 5 is an inclined surface, and the inclined direction of the inclined surface is consistent with the arrangement direction of the carding teeth 2. For example, if the comb teeth 2 are arranged gradually backward from left to right, the inclined surface is inclined backward from left to right. Here, the front side of the second arc-shaped lever 5 is referred to as a concave side surface.

During the specific use, when the tractor promoted the device forward movement, comb tooth 2 and sieve great stone from ground, because the mode that sets up that second arc pole 5 arranged backward gradually to and the mode that sets up on the inclined plane on the second arc pole 5, when can make the stone screened out, produce a horizontal component, thereby impel the stone to one side removal. That is, a lateral component force is generated on the slope by the forward pushing force of the second arc-shaped bar 5 to push the block to move to one side. Thereby achieving the purpose of removing stones and other sundries and further preventing the sundries on the ground, such as stones, from damaging the cutting knife.

As a better implementation manner, the first arc-shaped rod 3 is tangent to the straight rod 4 and is fixedly connected to the straight rod 4, and in specific implementation, the first arc-shaped rod 3 and the straight rod 4 are integrally formed or welded, preferably integrally formed.

Consider that the part buries the stone on ground, be difficult to be sieved by second arc pole 3 and remove to and can't clear up convex soil package, need dodge this part buries the stone on ground and bellied soil package. For this purpose, further design of the comb teeth 2 is required. Specifically, the lower end of the straight rod 4 is provided with two parallel connecting lugs 6, and the surface of each connecting lug 6 is parallel to the surface of the center line of the carding teeth 2; here, the surface of the engaging lug 6 is perpendicular to the center line of the hole of the engaging lug 6 for connecting the rotating shaft 7, in other words, the surface of the center line of the comb teeth 2 is perpendicular to the center line of the hole of the engaging lug 6 for connecting the rotating shaft 7. In the specific implementation, the center line of the comb teeth 2 is located in the vertical plane, so that the connecting lugs 6 can swing around the rotating shaft 7 in the vertical plane.

A rotating shaft 7 is arranged at the upper end of the second arc-shaped rod 5, and two ends of the rotating shaft 7 are respectively and rotatably connected with two connecting lugs 6 at the lower end of the same straight rod 4; and the bottom of the lower end of the second arc-shaped rod 5 is provided with a roller 8. When the height of the ground contacted by the roller 8 is increased, an upward force is generated on the roller 8, so that the second arc-shaped rod 5 is lifted upwards, and the purpose of avoiding is achieved.

An angle spring is arranged at the rotating shaft 7, so that the roller 8 can be in contact with the ground when the mowing device works; in order to ensure the effect of the device in use, the lower end of the second arc-shaped rod 5 should be as small as possible from the roller 8, and on the other hand, the horizontal section of the bottom of the roller 8 should be tangent to the lower end of the second arc-shaped rod 5.

When in use, the lower end of the straight rod 4 should be provided with a limiting structure 9 to limit the maximum position of the second arc-shaped rod 5 in downward rotation. The angle spring has the function of making the second arc-shaped rod 5 have the tendency of rotating downwards, so that the second arc-shaped rod 5 can abut against the limiting structure 9 under the action of the angle spring.

An angle sensor is arranged at the rotating shaft 7; the angle sensor is used for acquiring the lifting angle of the second arc-shaped rod 5, so that the height of the ground bulge can be acquired through the lifting angle of the second arc-shaped rod 5. Specifically, referring to fig. 6, taking the center of the roller 8 lifted from the position a to the position B as an example, the position of the second arc-shaped rod 5 is denoted as C, and the lifting angle is denoted as α; making auxiliary lines in the manner of the figure; the elevated height is BD; since the value of BC is fixed, the length of BE can BE solved according to the relation shown in the figure; that is, BE ═ BC sin (α/2);

and AB ═ 2 × BE;

since the angle between the initial position and the vertical, i.e. the angle ACD, is known and noted as beta,

AG ═ AC × sin β;

when the point B is lifted, the included angle between the angle BCF and the horizontal line is 90-alpha-beta;

then CF ═ BC cos (90- α - β);

thus, AD ═ CF-AG;

in the right triangle, the right side AD and the hypotenuse AB are known, and the height of BD can be found to be

As a preferred implementation, the cutting device further comprises a cutting mechanism 10; the cutting mechanism 10 is slidably arranged between two adjacent carding teeth 2, and the cutting mechanism 10 is positioned at the straight rod 4 or the first arc-shaped rod 3; the cutting mechanism 10 is used for cutting weeds which are combed by the combing teeth 2 and between two adjacent combing teeth 2.

When the moving speed of the mowing device is obtained during specific use, the horizontal distance between the second arc-shaped rod 5 and the cutting mechanism 10 is fixed due to the fixed position of the second arc-shaped rod, and therefore the time when the mowing device reaches the position above the center of the current roller 8 can be calculated to be t; so that the mowing device should be adjusted to the current BD height after t time is calculated.

Taking the illustration as an example, let the center point of the current roller 8 be B, since the distance between CF and the cutting mechanism 10 is fixed, the distance between C and C can be calculated. In addition, when the moving speed of the mowing device is known, the timing when the mowing mechanism 10 reaches above the point B can be further calculated, and at this timing, the mowing mechanism 10 can be adjusted to a position higher than the initial point position BD in the vertical direction.

Further, in order to realize the height adjustment of the cutting mechanism, the cutting mechanism also comprises a mounting plate 11 and a telescopic rod 12; the mounting plate 11 is fixedly mounted on the first arc-shaped rod 3, and the mounting plate 11 is positioned on one side of the first arc-shaped rod 3 close to the center of the curvature circle; one end of the telescopic rod 12 is hinged with the cutting mechanism 10, and the other end of the telescopic rod 12 is hinged with two adjacent mounting plates 11; the extension pole 12 is configured to drive the cutting mechanism 10 to slide such that the lowest point of the cutting mechanism 10 is higher than the height of the ground projection. In specific implementation, the telescopic rod 12 may be a pneumatic telescopic rod or an electric telescopic rod. The height of the cutting mechanism 10 can be calculated from the length of the extension rod 12 or can be achieved by providing a position sensor.

Furthermore, two opposite side surfaces of two adjacent carding teeth 2 are provided with sliding grooves 13; the sliding groove 13 is positioned on the straight rod 4; the length directions of the sliding grooves 13 are consistent; the cutting mechanism 10 comprises a sliding plate 14, a knife plate 15, a rotary driving piece 16 and a blade 17; two sides of the sliding plate 14 are respectively and slidably arranged in the sliding grooves 13 of two adjacent carding teeth 2, and the knife board 15 is fixed on the front side of the sliding plate 14; the rotary driving member 16 is mounted on the upper surface of the knife plate 15, the number of the blades 17 is multiple, and the multiple blades 17 are fixedly connected with the driving shaft of the rotary driving member 16; the driving shaft passes through the knife plate 15, and the upper surface of the blade 17 is attached to the lower plane of the knife plate 15. In one embodiment, the rotary driving member 16 may be a motor, or other structure capable of generating rotary driving force to the driving shaft. In specific implementation, a reinforcing rib is arranged between the cutting board 15 and the sliding board.

In order to further improve the cutting effect. The width of the knife plate 15 is gradually increased along the front-to-back direction; the knife board 15 gradually shrinks inwards along the direction from bottom to top; the blades 17 are gradually retracted inward in the top-to-bottom direction. Thus, the pressure generated on the weeds during cutting can be reduced to improve the shearing effect thereof.

In a preferred embodiment, the width of the comb teeth 2 is gradually increased in the front-to-rear direction.

Further, in order to prevent stones or other things from being buried in the cutter plate 15 when cleaning foreign materials. Further comprises a first protection plate 18; the first protection plates 18 correspond to the carding teeth 2 one by one, and the first protection plates 18 are arranged at the lower end of the straight bar 4 and extend forwards horizontally; the first protection plate 18 has a gradually increasing width in a front-to-rear direction. Thus, pre-combing of weeds is facilitated.

Furthermore, in order to prevent sundries from entering between two adjacent first arc-shaped rods 3, the novel umbrella further comprises a second protection plate, wherein the second protection plate covers the first arc-shaped rods 3, so that a gap between the adjacent first arc-shaped rods 3 is shielded.

In order to prevent the cut larger weeds from accumulating on the knife plate 15, the device further comprises a conveying structure 20; the conveying structure 20 comprises a rotating wheel 21 and a shifting lever 19; the rotating wheel 21 is rotatably arranged at the upper front part of the frame 1, and the rotating center of the rotating wheel 21 is horizontally and transversely arranged; the deflector rods 19 are uniformly distributed on the periphery of the rotating wheel 21 along a plurality of rows; the deflector rod 19 is used for deflecting the cut weeds above the frame 1 when rotating along with the rotating wheel 21. In specific implementation, the frame 1 is further provided with a concave plate which is concave downwards and used for storing the cut weeds, and the concave plate can play a role in preventing the weeds from falling on the ground as much as possible.

Through the structure, the invention can at least achieve the following effects:

1. by providing a plurality of comb teeth on the underside of the front end of the frame, a plurality of said comb teeth are distributed progressively rearwards in the transverse direction. In the using process, as the mowing device advances, stone or other sundries on the ground can generate transverse component force after encountering the combing teeth to promote the sundries to be gradually moved to one side of the frame, so that the damage of the sundries to the cutting knife can be avoided;

2. through the arrangement of the carding teeth, grass to be cut can be straightened between the adjacent carding teeth; so as to be convenient for cutting by matching with the cutting mechanism provided by the invention.

3. The carding teeth are arranged in an S shape, particularly, the circle center of a curvature circle corresponding to the second arc-shaped rod is positioned in front of the second arc-shaped rod, so that the second arc-shaped rod can have a smaller cutting angle when encountering sundries such as stones, the stones can be conveniently moved above the second arc-shaped rod, and then a transverse component force is generated by matching with the arrangement characteristics of the second arc-shaped rod to move the stones to one side of the frame, so that the function of removing the sundries is achieved;

4. the straight rod is rotatably connected with the second arc-shaped rod, and the roller is arranged at the bottom of the lower end of the second arc-shaped rod, so that the second arc-shaped rod can be automatically lifted when the second arc-shaped rod meets the terrain such as a raised soil bag, the second arc-shaped rod is prevented from being inserted into the soil bag, and the second arc-shaped rod can be ensured to smoothly pass through the terrain such as the soil bag;

5. the second arc-shaped rod is lifted up due to the contact of the roller with the ground. According to the lifting angle of the second arc-shaped rod, the height of the ground can be calculated. The cutting mechanism can be matched with the characteristic that the cutting mechanism can slide along the carding teeth, and the cutting height can be controlled according to the calculated height value, so that the cutting mechanism can be adaptively adjusted according to the terrain.

6. Due to the design of the carding teeth, sundries can be removed. The structure is particularly suitable for the requirements of remote control operation, unmanned operation and the like of the existing agricultural machinery.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.