CN217580067U - Grass square spreading machine - Google Patents

Abstract

The utility model discloses a grass square paver, which comprises a chassis, a grass curtain platform, a feeding mechanism, a cutting mechanism and a rolling mechanism; the chassis is provided with traveling wheels and is used for enabling the grass square paver to have self-traveling capacity or facilitating the grass square paver to travel under the traction action of traction equipment; the straw curtain platform is arranged above the chassis and is used for laying the straw curtain thereon; the feeding mechanism is used for paving the straw curtain on the straw curtain platform along the straw curtain; the cutting mechanism is arranged above the straw curtain platform and is used for cutting off the straw curtain laid on the straw curtain platform; the rolling mechanism is arranged above the straw curtain platform and used for pressing the cut straw curtain into sandy soil. Through setting up straw curtain platform, feeding mechanism, cutting mechanism and rolling mechanism, whole journey only need alone will roll up the cylinder that has the straw curtain and install on the chassis, can realize the autoloading of straw curtain, cut and press the grass function, practice thrift artifically, improve the grass square and lay efficiency and shop grass quality.

Description

Grass square spreading machine

Technical Field

The utility model belongs to the technical field of the equipment of controlling sand, concretely relates to grass square paver.

Background

Desertification is caused by the fact that the ecological system is destroyed due to excessive pursuit of economic activities by human beings, so that an environment change process similar to desert landscape appears in non-desert areas. Land desertification is a sign of environmental degradation and is a positive feedback process of environmental instability. If no fundamental measures are taken, the process of the land wind erosion desertification cannot be automatically stopped, but the development is aggravated.

At present, one of the national means for controlling land desertification is to arrange sand barriers, including grass grid sand barriers, clay sand barriers and the like. The Chinese herbal check sand barrier is made of wheat straw, rice straw, reed and other materials, and is tied on a flowing sand dune to form a wind-shield wall so as to weaken the erosion of wind power, and meanwhile, the Chinese herbal check sand barrier has the function of intercepting rainfall, can improve the water content of a sand layer and is beneficial to the growth of sand plants.

The prior common use of China is still the traditional grass square grid laying technology, and the main steps of grass square grid production are wheat straw sorting, wheat straw placing and treading and forming. The worker wears the glove and picks up a proper amount of wheat straw to flap against the wind, and then flares the broken wheat straw and the shorter wheat straw to leave the long wheat straw which is suitable to be used as a grass square. After the wheat straw is sorted, the worker places the wheat straw along the square squares that have been drawn and keeps the thickness of the wheat straw constant during the placement. And finally, the placed wheat straws are pressed downwards by using a shovel along the direction of the square grids with force, and two sides of the wheat straws naturally stand up due to the force of the shovel, so that a natural barrier consisting of the wheat straws is formed. After the wheat straw is erected, workers can step the surrounding soil on the root of the wheat straw, so that the stability of the wheat straw barrier is enhanced. The grass square sand barrier needs to consume a large amount of manpower and material resources, takes a lot of labor in the laying process, needs manual maintenance, and needs manual screening of wheat straw and production when grass squares are produced.

Ningxia now uses brush-shaped net rope type grass grid sand barrier sand control technology. Workers need to use a special grass square sand barrier material production device to fix the grass ropes and the brush-shaped grass curtains together in advance, so that a certain number of brush-shaped net ropes are obtained. After the production is finished, workers need to transport the products to the area needing to be treated by trucks. In the process of making the grass square, workers need to lay the brush-shaped net rope on the sand ground in a mode of 1m multiplied by 1m by one group. Only 3 minutes are needed, and the net rope type grass grid sand barrier with the area of 8m & lt 2 & gt can be manufactured. Compared with the traditional manufacturing mode of the grass square sand barrier, the net rope type grass square sand barrier only fixes the periphery, and the net rope intersection is tied and fixed by using the rope. Although the method improves the manufacturing efficiency and reduces the cost to a certain extent, certain manpower is still required.

For semi-automatization machinery, the cost of labor is reduced to the very big degree of robot is laid to the grass curtain, and mechanical structure can also guarantee the sand prevention effect of grass square sand barrier, reduces follow-up maintenance process. The straw mat laying robot mainly comprises a tractor, a longitudinal laying mechanism and a transverse laying mechanism, wherein the desert vehicle is used for drawing, and the longitudinal laying mechanism and the transverse laying mechanism execute the task of laying straw squares. The robot can realize automatic production and manufacture of the grass square grid sand barriers, but needs to be stopped repeatedly in the laying process, the efficiency is improved compared with the traditional method, the labor is saved, the result is still unsatisfactory, a better solution is provided, and the labor is saved while the higher efficiency is considered.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve prior art's shortcoming, provide a practice thrift artifical, improve the grass square machine of spreading grass of efficiency and grass quality.

The technical scheme for achieving the purpose comprises the following steps.

The utility model provides a grass square paver, which comprises a chassis, a grass curtain platform, a feeding mechanism, a cutting mechanism and a rolling mechanism; the chassis is provided with traveling wheels and is used for enabling the grass square paver to have self-traveling capacity or facilitating the grass square paver to travel under the traction action of traction equipment; the straw curtain platform is arranged above the chassis and is used for laying the straw curtain thereon; the feeding mechanism is used for paving the straw curtain on the straw curtain platform along the straw curtain; the cutting mechanism is arranged above the straw curtain platform and is used for cutting off the straw curtain laid on the straw curtain platform; the rolling mechanism is arranged above the straw curtain platform and used for pressing the cut straw curtain into sandy soil.

In some embodiments, the feeding mechanism comprises a roller with the same axial direction as the travelling direction and a motor driving the roller to rotate, and the roller can rotatably unfold the straw mat wound on the roller on the straw mat platform and gradually extend along the straw mat platform to the position below the cutting mechanism.

In some of these embodiments, the cutting mechanism includes a cutting blade that can cut off the grass cords on the grass curtain and a cutting cylinder that drives the cutting blade up and down, the cutting cylinder being disposed adjacent to the drum.

In some embodiments, the rollers are provided with two rollers, and the arrangement direction of the two rollers is perpendicular to the travelling direction;

the rolling mechanism comprises a screw rod, a sliding block, a rolling cylinder, a connecting rod mechanism and two rolling wheels, the screw rod, the sliding block, the rolling cylinder, the connecting rod mechanism and the two rolling wheels are all arranged between the two rollers and perpendicular to the rollers, the sliding block is sleeved on the screw rod, the rolling cylinder is rotatably arranged on the sliding block, a piston rod of the rolling cylinder is connected to the connecting rod mechanism, the two rolling wheels are all connected with the connecting rod mechanism, the two rolling wheels are perpendicular to a connecting line of the connecting rod, the screw rod can be driven to rotate forwards or backwards to enable the sliding block to move back and forth along the screw rod, and the connecting rod mechanism can be driven by the piston rod of the rolling cylinder to realize switching of the two rolling wheels.

In some embodiments, the number of the cutting mechanisms is two, and the two cutting mechanisms are arranged close to the two rollers in a one-to-one correspondence and are positioned between the rollers and the screw rod.

In some of these embodiments, still include straw curtain length detection subassembly, it includes the sensor that two intervals set up, and two sensors are all located between two cylinders and when straw curtain passes through two sensors successively the output sign straw curtain length satisfies the signal of telecommunication of demand.

In some of these embodiments, both sensors are ultrasonic sensors.

In some embodiments, the straw curtain platform and the chassis are both provided with a straw pressing groove, the straw pressing groove is arranged in the middle of the straw curtain platform in the width direction and extends along the length direction of the straw curtain platform, and the rolling wheel is arranged right above the straw pressing groove.

In some embodiments, a guide slope is connected to the end of the straw curtain platform close to the feeding mechanism.

In some embodiments, the straw curtain cutting and rolling device further comprises a wind and sand prevention cover, the wind and sand prevention cover is connected with the chassis and defines a containing cavity, the straw curtain platform, the feeding mechanism, the cutting mechanism and the rolling mechanism are all arranged in the containing cavity, and the cutting mechanism and the rolling mechanism are fixed with the wind and sand prevention cover.

The utility model provides a technical scheme has following advantage and effect:

through setting up straw curtain platform, feeding mechanism, cutting mechanism and rolling mechanism, whole journey only need alone will roll up the cylinder that has the straw curtain and install on the chassis, can realize the autoloading of straw curtain, cut and press the grass function, practice thrift artifically, improve the grass square and lay efficiency and shop grass quality.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles, principles and effects of the invention.

Unless otherwise specified or defined, the same reference numerals in different figures refer to the same or similar features, and different reference numerals may be used for the same or similar features.

Fig. 1 is a schematic perspective view of a grass square paver according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the grass grid paver of FIG. 1 with the wind and sand control covers removed;

FIG. 3 is a diagram illustrating the assembly of the feeding mechanism, the cutting mechanism and the rolling mechanism of the square straw paver of FIG. 1 according to the present invention;

FIG. 4 is a schematic perspective view of a grass grid paver according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating the assembly of the feeding mechanism, the cutting mechanism and the rolling mechanism of the square straw paver of FIG. 4 according to the present invention;

figure 6 is a schematic view of the rolling cylinder of figure 5 in an extended position;

figure 7 is a schematic view of the rolling cylinder of figure 5 in a fully extended configuration;

fig. 8a-8d are the utility model discloses a grass curtain laying machine spreads the effect schematic diagram of grass, and fig. 8a and 8b show the relation between direction of traction's speed and rolling mechanism speed, and 8c shows the grass curtain and lays the route, and fig. 8d lays the effect picture for whole grass square, and wherein, v1 is rolling wheel speed, and v2 is tractor speed, and v3 is grass square and lays speed, and s lays actual effect for single row grass square.

Description of the reference numerals:

10. a chassis; 20. a wind and sand prevention cover; 21. a feed chute; 30. a grass curtain platform; 31. pressing a grass groove; 32. Guiding the slope surface; 40. a feeding mechanism; 41. a drum; 50. a cutting mechanism; 51. cutting the air cylinder; 52. A cutting blade; 60. a rolling mechanism; 61. mounting blocks; 62. a screw rod; 63. a slider; 64. a rolling cylinder; 65. a link mechanism; 66. rolling wheels; 67. a moving motor; 70. a fixing mechanism; 71. fixing the rod; 72. a rotating shaft; 80. a finished product straw mat; 100. a grass grid paver; 101. a traveling wheel; 200. a tow hook.

Detailed Description

To facilitate understanding of the present invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.

Unless specifically stated or otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the case of combining the technical solution of the present invention with realistic scenarios, all technical and scientific terms used herein may also have meanings corresponding to the objects of realizing the technical solution of the present invention.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless otherwise specified or defined.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

As shown in fig. 1 to 3, the utility model relates to a grass square paver 100 for automatically cutting grass curtains and pressing the grass curtains into sandy soil, greatly saving manpower, improving grass paving efficiency and grass paving quality. This grass square paver 100 may be provided with a self-walking mechanism to achieve a walking function, or connected with a tractor by a tow hook 200 to pave grass in a preset direction under the traction of the tractor.

The grass grid paver 100 comprises a chassis 10, a wind-proof and sand-proof cover 20, a grass curtain platform 30, a feeding mechanism 40, a cutting mechanism 50 and a rolling mechanism 60, wherein the chassis 10 and the wind-proof and sand-proof cover 20 define a containing cavity, and the grass curtain platform 30, the feeding mechanism 40, the cutting mechanism 50 and the rolling mechanism 60 are all located in the containing cavity.

The corner end of the chassis 10 is provided with a traveling wheel 101, and the traveling wheel 101 is preferably a roller, so that the grass square paver 100 can conveniently travel on the sand.

The straw curtain platform 30 is fixed above the chassis 10, the straw curtain platform 30 is provided with a plane and a guide slope surface 32 connected to two ends of the plane, the plane is used for unfolding the straw curtain to be laid on the plane, and the guide slope surface 32 is used for guiding the activity direction of the straw curtain to ensure the smooth transmission and unfolding of the straw curtain. Grass pressing grooves 31 are formed in the middle of the grass curtain platform 30 in the width direction, the width of each grass pressing groove 31 is 100mm, and the grass pressing grooves extend in the length direction of the grass curtain platform 30.

In one embodiment, the feeding mechanism 40 includes a roller 41 and a driving motor for driving the roller 41 to rotate, the axial direction of the roller 41 is the same as the traveling direction of the grass grid paver 100, a finished grass curtain 80 is wound on the roller 41, and the roller 41 is disposed above the guide slope 32 and can rotatably drop the grass curtain on the guide slope 32 and unfold the grass curtain along a plane.

The cutting mechanism 50 is disposed above the straw mat platform 30 and adjacent to the roller 41, and is used for cutting the straw mat lines of the straw mat to cut the desired straw mat sections from the finished straw mat 80. The cutting mechanism 50 includes a cutting blade 52 and a cutting cylinder 51 for driving the cutting blade 52 to move up and down.

The rolling mechanism 60 is used for pressing the cut grass curtain sections into sandy soil to complete the laying of the grass squares. The rolling mechanism 60 comprises rolling wheels 66, and the rolling wheels 66 can be driven to penetrate out of the grass pressing groove 31 and roll to press the grass curtain sections into the sandy soil. The running direction of the roller 66 is perpendicular to the traveling direction of the grass square paver 100 (the traction direction if the grass square paver 100 is towed).

In one embodiment, there are two feeding mechanisms 40, and two feeding mechanisms 40 are arranged in a direction perpendicular to the traveling direction, that is, two feeding mechanisms 40 are disposed at the left and right sides of the traveling direction. The cutting mechanisms 50 are provided in two, respectively adjacent to the two rollers 41.

Please refer to fig. 4 to 5:

in an embodiment, two opposite fixing mechanisms 70 are disposed on two sides of the top of the wind-proof and sand-proof cover 20, the fixing mechanism 70 includes two opposite fixing rods 71, a rotatable rotating shaft 72 is erected on the fixing rods 71, the finished straw curtain 80 is wound on the rotating shaft 72, two feeding grooves 21 communicated with the accommodating cavity are disposed on two sides of the wind-proof and sand-proof cover 20, and the straw curtain penetrates through the feeding grooves 21 and extends into the accommodating cavity to be connected with the feeding mechanism 40.

In one embodiment, the feeding mechanisms 40 are disposed at two sides of the straw mat platform 30, and each feeding mechanism 40 is provided with two rollers 41, a feeding gap for the straw mat to pass through is formed between the two rollers 41, and the guiding slope 32 is formed on the roller 41 located below in the direction toward the cutting mechanism 50.

The rolling mechanism 60 further comprises a lead screw 62, a sliding block 63, a rolling cylinder 64 and a link mechanism 65, the lead screw 62 is perpendicular to the roller 41 and connected between the two cutting mechanisms 50, the sliding block 63 is sleeved on the lead screw 62 and can slide along the lead screw 62, the rolling cylinder 64 is rotatably arranged on the sliding block 63, the link mechanism 65 is connected to a piston rod of the rolling cylinder 64, the two rolling wheels 66 are connected with the link mechanism 65, the connecting line between the two rolling wheels 66 and the link mechanism 65 is perpendicular, the lead screw 62 can be driven by a moving motor 67 in transmission connection with the lead screw to rotate forward or backward to drive the sliding block 63 to slide leftward or rightward, and the link mechanism 65 can be driven by the rolling cylinder 64 to switch the two rolling wheels 66. Through the alternate work of two rolling wheels to and the reciprocating motion of lead screw slider, realize the seamless connection between the grass square, still guaranteed the quality of laying of grass square when having improved the efficiency of laying of grass square.

When the device is used, the top end of the rolling air cylinder 64 is provided with a hinged block, the hinged block is hinged with the sliding block 63, and a piston rod of the rolling air cylinder 64 is contracted at the moment;

referring to fig. 5, when the piston rod of the rolling cylinder 64 is completely retracted, the rolling cylinder 64 is inclined to the traveling direction of the slider 63, and at this time, the rolling wheel 66 connected to the link mechanism 65 is parallel to the traveling direction of the slider 63, and the other rolling wheel 66 is perpendicular to the traveling direction of the slider 63;

referring to fig. 6, when the piston rod of the rolling cylinder 64 starts to extend out, the rolling cylinder 64 rotates along the hinge joint with the sliding block 63 in a direction perpendicular to the traveling direction of the sliding block 63, and meanwhile, the piston rod of the rolling cylinder 64 pushes the link mechanism 65 to rotate, and the link mechanism 65 pushes the two rolling wheels 66 to rotate;

referring to fig. 7, when the piston rod of the rolling cylinder 64 is fully extended, the rolling cylinder 64 rotates along the hinge of the rolling cylinder 64 and the sliding block 63 in a direction perpendicular to the traveling direction of the sliding block 63 to a direction perpendicular to the traveling direction of the sliding block 63, or close to the direction perpendicular to the traveling direction of the sliding block 63, or still inclines, at this time, the rolling wheels 66 connected to the link mechanism 65 rotate to a direction perpendicular to the traveling direction of the sliding block 63, and the other rolling wheel 66 rotates to a direction parallel to the traveling direction of the sliding block 63.

Preferably, the grass grid paver 100 further comprises a grass mat length detection assembly comprising two spaced sensors (not shown, the same applies hereinafter), both of which are arranged between the two rollers 41 and output an electrical signal indicative of the length of the grass mat meeting the requirements when the grass mat passes successively over the two sensors. From this, can automatic identification grass curtain's expansion length for the length of the forage section of cutting is the same, improves the uniformity, thereby improves the grass square and lays the effect. Preferably, the two sensors are ultrasonic sensors, and can be arranged on or above the straw mat platform, the distance between the two sensors can be set according to the length of the straw mat to be cut, and in the embodiment, the distance between the two sensors is one meter.

The cutting cylinder 51 is fixed to the wind and sand prevention cover 20, and the lead screw 62 is fixed below the wind and sand prevention cover 20 by a mounting block 61. Prevent wind sand prevention lid 20 through setting up, can realize preventing wind husky function, protect the inside mechanism of grass square paver, increase of service life also can provide cutting mechanism 50 and rolling mechanism 60's fixed position, makes things convenient for the structure setting of grass square paver 100.

The grass grid paver of the present embodiment shown in fig. 1-3 may protect the finished curtain 80 during use, and the grass grid paver of fig. 4-7 may facilitate the removal of the finished curtain 80.

Referring to fig. 8a-8d, the working principle of the grass square paver 100 of the present invention is as follows:

when the initial state is set, the slide block 63 is positioned at the left side of the straw mat platform 30, and the rolling cylinder 64 contracts. At this time, the feeding mechanism 40 on the right side works, the motor is started, the straw mat is flatly laid on the straw mat platform 30, when the sensor detects that the straw mat on the straw mat platform 30 is already laid to 1 meter, a signal is sent, the right cutting mechanism 50 works, the straw mat is cut off (namely, a straw mat section with the length of 1 meter is cut off), meanwhile, a piston rod of the rolling air cylinder 64 extends out, and the connecting rod mechanism 65 works, so that a rolling wheel 66 presses the straw mat section downwards into the sand by 15mm to 25mm. Then the grass grid paver 100 advances with the running speed v2 and the direction downward, the screw rod 62 is started at the same time, the rolling wheel 66 has the speed v1 and the direction rightward, the screw rod 62 drives the connecting rod mechanism 65 to move, and hay rows which are 1 meter long and form an included angle of 45 degrees with the moving direction of the grass grid paver 100 are paved on the ground.

When the screw rod 62 is started, the feeding mechanism 40 positioned on the left side of the straw curtain platform 30 starts to work, the straw curtain is tiled on the straw curtain platform 30 from the left side, when the screw rod 62 moves to the right side of the straw curtain platform 30, the feeding mechanism 40 positioned on the left side just lays the straw curtain of 1 meter on the straw curtain platform 30, the cutting mechanism 50 positioned on the left side works at the moment, the straw curtain is cut off, meanwhile, the connecting rod mechanism 65 works, the piston rod of the rolling air cylinder 64 contracts, and the straw curtain is pressed into the sand by 15mm to 25mm by switching to the other rolling wheel 66. Then the screw 62 is reversed, the link mechanism 65 moves to the left, and hay rows which are 1 meter long and form an included angle of 135 degrees with the movement direction of the grass square paver 100 are paved on the ground.

Through repeated cycles of the above movement process, 1m x 1m square of grass is laid on the ground as shown in fig. 8 d. When the straw mat on the roller 41 in the feeding mechanism 40 is used up, the straw mat can be replaced quickly by directly replacing the roller 41.

Compared with the existing grass grid laying technology, firstly, the grass curtain laying robot needs two horizontal and vertical slotting tools, and the grass curtain laying robot belongs to intermittent laying. And the utility model discloses a grass square paver 100 just can realize the preparation of the grass square sand barrier of horizontal and two vertical directions with a rolling mechanism 60, belongs to and lays in succession, can improve and lay efficiency. In addition, the transverse slotting tools and the longitudinal slotting tools of the straw mat laying robot need to be frequently lifted and put down, and in order not to influence the laying of the grass square sand barriers, the lifting time and the putting down time of the slotting tools are as short as possible. However, the increased speed brings certain impact force to the machine itself, which is not beneficial for long-term use. And the utility model discloses a grass square paver 100 adopts two gyro wheels of rotatory switching of mode of roll extrusion cylinder 64 drive link mechanism 65, does not have the impact force basically to the tractor, has prolonged the life of paver.

Secondly, the straw mat laying robot needs to stop once every 1 meter of running in the working process, and frequent starting and stopping can lead to error increase, and meanwhile, a driver can swing back and forth due to inertia to cause discomfort and be not beneficial to work. The full-automatic grass square groove paving machine of the utility model does not need to stop in the working process, thus reducing the uncomfortable feeling of the driver and improving the grass paving efficiency.

When the drawing description is quoted, the new characteristics are explained; in order to avoid that repeated reference to the drawings causes the description to be not concise, the drawings are not referred to one by one in the case of clear description of the described features.

The above embodiments are intended to be illustrative, and should not be construed as limiting the scope of the invention, and the technical solutions, objects and effects of the present invention are described in full herein.

The above embodiments are not intended to be exhaustive list of the present invention, and there may be many other embodiments not listed. Any replacement and improvement made on the basis of not violating the concept of the utility model belong to the protection scope of the utility model.

Claims (10)

1. The grass square paver is characterized by comprising a chassis, a grass curtain platform, a feeding mechanism, a cutting mechanism and a rolling mechanism; the chassis is provided with traveling wheels and is used for enabling the grass square paver to have self-traveling capacity or facilitating the grass square paver to travel under the traction action of traction equipment; the straw curtain platform is arranged above the chassis and is used for laying the straw curtain thereon; the feeding mechanism is used for paving the straw curtain on the straw curtain platform along the straw curtain; the cutting mechanism is arranged above the straw curtain platform and is used for cutting off the straw curtain laid on the straw curtain platform; the rolling mechanism is arranged above the straw curtain platform and used for pressing the cut straw curtain into sandy soil.

2. A square lawnmower according to claim 1, wherein the feed mechanism comprises a roller having an axis in the same direction as the direction of travel and a motor for driving the roller to rotate, the roller being rotatable to unwind the mat wound thereon onto the mat platform and progressively extend along the mat platform below the cutting mechanism.

3. A square lawnmower according to claim 2, wherein the cutting mechanism comprises a cutting blade operable to cut the grass cords from the grass mat and a cutting cylinder for driving the cutting blade up and down, the cutting cylinder being located adjacent the drum.

4. A square lawnmower according to claim 2, wherein there are two of said rollers, the two rollers being arranged perpendicular to the direction of travel;

the rolling mechanism comprises a screw rod, a sliding block, a rolling cylinder, a connecting rod mechanism and two rolling wheels, the screw rod, the sliding block, the rolling cylinder, the connecting rod mechanism and the two rolling wheels are all arranged between the two rollers and perpendicular to the rollers, the sliding block is sleeved on the screw rod, the rolling cylinder is rotatably arranged on the sliding block, a piston rod of the rolling cylinder is connected to the connecting rod mechanism, the two rolling wheels are all connected with the connecting rod mechanism, the two rolling wheels are perpendicular to a connecting line of the connecting rod, the screw rod can be driven to rotate forwards or backwards to enable the sliding block to move back and forth along the screw rod, and the connecting rod mechanism can be driven by the piston rod of the rolling cylinder to achieve switching of the two rolling wheels.

5. A square paver according to claim 4 wherein there are two of said cutting mechanisms, two of said cutting mechanisms being located one adjacent each of the two rollers and between the rollers and the screw.

6. A square lawnmower according to claim 4, further comprising a shade length detection assembly comprising two spaced apart sensors, both of which are disposed between the two rollers and output an electrical signal indicative of the shade length meeting the requirements when the shade passes over the two sensors in sequence.

7. A square lawnmower according to claim 6, wherein both sensors are ultrasonic sensors.

8. A square straw spreader as claimed in claim 4, wherein the straw screen platform and the chassis are each provided with a straw pressing groove, the straw pressing groove is arranged in the middle of the straw screen platform in the width direction and extends along the length direction of the straw screen platform, and the rolling wheel is arranged right above the straw pressing groove.

9. A square hay spreader as claimed in claim 1, wherein a guide ramp is attached to the end of said mat platform adjacent said feed mechanism.

10. A square grass paver as defined in claim 1 further comprising a wind and sand prevention cover connected to the chassis and defining a cavity, said grass curtain platform, feed mechanism, cutting mechanism and roller press mechanism all being located in said cavity and both being fixed to the wind and sand prevention cover.

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