JPH07255205A - Method for fluorescent labeling of sugar and rotary tiller - Google Patents

Abstract

PURPOSE:To prevent soil clogging in an extended cover part caused by narrowing between a rotation locus of a rotary tiller and the extended cover by keeping smoothness of rocking up and down a land grading body and accurately preventing clogging up of a tilled soil sprung up by the rotary tiller between the rear terminal part of a fixed cover and the upper part of a land grading part. CONSTITUTION:An elastic cover material 35 is installed which covers above a rotary tilling body 14. The elastic cover body 35 has an extended cover part 39 extended toward a land grading body 22. A space between the rear end of a fixed cover body 18 and the upper end of the land grading body 22 is covered with the extended cover part 39. The extended cover part 39 is supported by a supporter 40 along the land grading body 22 by bending it in shape of backward projected concaved arc. The lower end of the extended cover part 39 is arranged by extending to almost middle part between upper and lower directions of the inside of the land grading body 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tiller, and more particularly to a cover device for covering the upper part of a rotary tiller.

[0002]

2. Description of the Related Art Conventionally, as a rotary cultivating apparatus of this type, a fixed cover body is arranged above a rotary cultivated body, as described in Japanese Utility Model Laid-Open No. 4-127102, and the fixed cover is provided. The upper end of the ground leveling body is pivotally supported by a hinge pin at the rear end of the body, and the upper end of the rubber cover is attached to the support plate part projecting forward from the rear end of the cover body with bolts, nuts and pressers. While supporting with a plate, the lower end of the rubber cover is provided between the holding plate and the hinge part at the upper end of the ground leveling body, or it is curved and projected toward the rotary cultivator. There is known a structure in which the upper end of the rubber cover is fixed to the support plate by bolts and nuts, and the lower end of the rubber cover is fixed to the upper end of the ground leveling body by bolts and nuts.

[0003]

In the structure described in the above-mentioned publication, the plowing soil, which is sprung up by the rotary plowing body with the rubber cover, is clogged between the rear end portion of the cover body and the upper end portion of the ground leveling body. However, since the holding plate supporting this rubber cover has a vertical portion protruding toward the rotary tillage and an inclined portion inclined rearward from the lower end of this vertical portion. , The vertical portion of the holding plate narrows the distance between the rotary locus of the rotary cultivated body, and the inclined portion of the holding plate is attached to the cultivated soil that is flipped up by the rotary cultivated body, so that the soil is easily clogged. Also, when the rubber cover is curved and protruded toward the rotary cultivator, the cultivated soil that is flipped up by the rotary cultivator is attached to the bolt head of the bolt at the lower end of the rubber cover. Easy to use, therefore, the tillage soil is rotated around the rotary tiller easily, and the tilling resistance is easily increased. Moreover, this rubber cover prevents the tillage soil from being clogged between the rear end of the cover and the upper end of the soil leveler. Since it is a dedicated one and is not arranged along the lower side of the fixed cover body, there is a problem that the tilling soil carried by the rotary tiller easily attaches to the lower side portion of the fixed cover body. .

The present invention has been made in view of the above circumstances, and the rear portion of the fixed cover body is extended by the extension cover portion of the elastic cover body which prevents the plowing soil from attaching to the lower side portion of the fixed cover body. It is possible to reliably prevent clogging of the cultivated soil that is flipped up by the rotary cultivated body between the end and the upper end of the soil cultivating body, and to prevent the rotary cultivated body's rotation locus with this extension cover. The space will not be narrowed and the soil will not be clogged, the plowing soil will not attach to the extension cover part,
In addition, a soil receiving space is formed at the upper rear part of the rotary cultivating body by the concave arc-shaped curved portion of the extension cover portion, and this soil receiving space allows the cultivated soil to be lifted up by the rotary cultivating body well, so that the soil of the cultivating soil is well separated. There is little carry around and the tilling resistance does not increase, and the extension cover part is not pulled by the tilling soil at the time of leveling. Therefore, the leveling body can smoothly rotate up and down with the simple structure to level the tilling soil. An object of the present invention is to provide a rotary cultivating device that can be used.

[0005]

A rotary tiller according to claim 1 is a machine frame, a rotary tiller rotatably provided on the machine frame, and the rotary tiller located above the rotary tiller. A fixed cover body provided on the frame, a leveling body that is disposed rearward of the rotary tiller and is pivotally supported in the rear end portion of the fixed cover body so as to be vertically rotatable, and a lower portion of the fixed cover body. An elastic cover body which is disposed along a side portion and covers an upper portion of the rotary tillage body, the elastic cover body having an extension cover portion extending toward the ground leveling body, and the extension cover portion. And to cover between the rear end of the fixed cover and the upper end of the ground leveling body.

A rotary tiller according to a second aspect of the present invention is the rotary tiller according to the first aspect, wherein the elastic cover body has its front end portion attached to the front end portion of the fixed cover body and its extension cover portion. It is supported along the ground leveling body by being curved in a concave arc shape protruding rearward by a support tool attached to the rear end portion of the fixed cover body.

According to a third aspect of the present invention, there is provided the rotary cultivating device according to the first or second aspect, wherein the elastic cover body has a lower end portion of the extension cover portion which is substantially an intermediate portion in the vertical direction of the inner portion of the ground leveling body. It has been extended and arranged.

[0008]

In the rotary tiller according to the first aspect of the present invention, the rotary tiller is driven to rotate as the machine frame progresses, whereby the soil of the field is sequentially tilled by the rotary tiller and the rotary tiller is added to the rotary tiller. The tilled soil is thrown up toward the ground leveling body one after another, while the tilled soil is received by the lower front part of the ground leveling body and the extension cover part of the elastic cover body which are towed by the progress of the machine frame. At the same time, these tillages are dropped from the extension cover portion toward the lower front side of the ground leveling body.

At this time, the extension cover portion of the elastic cover body is pressed toward the ground leveling body by the earth pressure of the tilled soil which is successively discharged from the rotary cultivating body, and the extension cover part of the elastic cover body pushes up the ground leveling body. Cultivation soil is prevented from entering and clogging between the upper end and the rear end of the fixed cover body. Further, the elastic action of the extension cover portion prevents the tillage soil from attaching to the extension cover portion.

Then, while the ground leveling body rotates in the up-and-down direction around the pivotal support portion with the rear end of the fixed cover body, the ground leveling body sequentially cultivates the tilled soil flatly from the rotary field. It is leveled.

Further, the tilled soil carried by the rotary tiller is thrown toward the elastic cover body arranged along the lower side of the fixed cover body, and the elastic action of this elastic cover body is provided. This prevents the tilling soil from attaching to the elastic cover body.

In the rotary tiller according to the second aspect of the present invention, the cultivated soil released from the rotary cultivated body is received by the concave arc-shaped curved portion of the extension cover portion, and the cultivated soil is terrained from the extension cover portion. It is dropped toward the lower front side.

Further, a soil receiving space is formed at the upper rear portion of the rotary cultivating body by the concave arc-shaped curved portion of the extension cover portion, and the soil of the cultivated soil released from the rotary cultivating body is separated from the soil in the soil receiving space. Well, the cultivated soil radiated from the rotary cultivated body is received in this soil receiving space, and the cultivated soil is less likely to rotate and the cultivating resistance does not increase. The soil is prevented from clinging to the extension cover part.

In the rotary cultivator according to the third aspect of the present invention, since the lower end portion of the extension cover portion of the elastic cover body is disposed so as to extend to a substantially middle portion in the vertical direction of the ground leveling body, the ground leveling by the ground leveling body is performed. During the operation, the extension cover is not pulled by the cultivated soil, and the cultivated soil is rectified by the soil terrain.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a machine frame, which has a pipe-shaped main frame 2 which is long in the left-right direction, and has brackets 3 arranged vertically at opposite ends of the main frame 2. The upper end portions are integrally fixed to each other, and the vertical transmission case 4 is integrally fixed to the outer side portion of the bracket 3 on one side.

Further, a mission 6 having an input shaft 5 rotatably projecting forward is provided at a substantially middle portion of the main frame 2 in the left-right direction, and a top mast 7 is provided above the mission 6. A substantially semi-cylindrical cover 8 is provided at the front end of the mission 6 so as to integrally project upward and cover the upper side of the input shaft 5.

Further, a pipe-shaped support frame 9 which is long in the left-right direction and which is disposed in parallel with the main frame 2 is integrally fixed between the upper portions of the front ends of the left and right brackets 3.
Suspending bodies 10 are integrally projecting forward at both ends of each, and supporting rods 12 on which a gauge wheel 11 is rotatably mounted are vertically positionally adjustable on the left and right suspending bodies 10. It is connected to and supported by. Further, both side portions of the support frame 9 are connected to and supported by supporting pieces 13 projecting from both side portions of the main frame 2.

Next, a rotary tiller 14 is rotatably mounted between the lower ends of the bracket 3 and the transmission case 4 on the one side and the lower end of the bracket 3 on the other side. This rotary cultivator 14 has a cultivating shaft 15 rotatably mounted between the lower end of the bracket 3 and the transmission case 4 on the one side and the lower end of the bracket 3 on the other side,
This cultivating shaft 15 has a large number of flanges axially spaced from each other.
16 are integrally fixed, and each of the flanges 16 is provided with a plurality of tilling claws 17 radially protruding.

The rotary tiller 14 is rotatably inserted in the main frame 2 to form the mission 6.
The output shaft (not shown) and an interlocking medium (not shown) provided in the transmission case 4 are rotationally driven by the output from the mission 6.

A fixed cover 18 is fixed between the left and right brackets 3 of the machine frame 1 located above the rotary tiller 14. The fixed cover body 18 has side covers 19 arranged and fixed inside the left and right brackets 3, and the rotary tiller is provided between the left and right side covers 19.
An arc-shaped cover top plate 20 that covers the upper part of 14 is integrally fixed.

A cover top plate 20 of the fixed cover body 18 is also provided.
The left and right hinges 21 are provided at the rear end of the rotary tiller 14
An upper end portion of the ground leveling body 22 arranged at the rear of is rotatably supported in the vertical direction. The ground leveling body 22 has a vertical ground leveling plate 23 formed to have a width substantially equal to the width of the rotary tiller 14 in the left-right direction. The grounding plate 23 is formed with an earth depression 25 projecting rearward while a concave recess 24 projecting upward is formed.

Further, vertical reinforcing support frames 26 are integrally fixed to both end portions and both side portions of the leveling plate 23 in the left-right direction, and both sides fixed to inner portions of the reinforcing support frames 26 at both end portions. The links 27 are integrally projecting upward at the upper end of the reinforcing support frame 26, and the links 27 on both sides are
The lower end of the support rod 28 is rotatably supported by a support shaft 29 in the vertical direction at the upper end of the support rod 28. The upper ends of the support rods 28 on both sides of the support rod 28 are supported on both sides of the machine frame 1. Each of them is connected to and supported by a support tool 30 projecting from the rear end thereof so as to be positionally adjustable in the front-rear direction and rotatable in the vertical direction.

The hinges 21 on both sides are the support shafts 31 in the left-right direction.
Has hinge pieces 32 on both sides rotatably supported, and one of the hinge pieces 32 is integrally projectingly provided on the rear end of the cover top plate 20 to form a vertical portion 34 of the connecting frame 33. The hinge piece 32 at the other end is fixed to the leveling plate 23.
Is fixed to the upper end of the.

Next, the cover top plate of the fixed cover body 18
An elastic cover body 35 is arranged along the entire lower surface of the 20. The elastic cover body 35 is formed of an elastic plate member such as a rubber plate, and its front end is attached to the front end of the cover top plate 20 by a plurality of bolts and nuts 36 arranged in the left-right direction. At the same time, the rear side of the cover top plate 20 is attached to the left and right connecting pieces 37 connected to the rear end of the cover top plate 20 by a plurality of bolts and nuts 38 arranged in the left and right direction.

The connecting piece 37 is positioned below the left and right hinges 21 and is continuously inclined toward the rear end of the cover top plate 20 from the lower end of the vertical portion 34 of the connecting frame 33 toward the rear lower side. And the connecting piece 37 constitutes a part of the rear end portion of the arc-shaped cover top plate 20.

The elastic cover body 35 is attached to the ground leveling body 22 from the attachment portion attached by the plurality of bolts and nuts 38.
Has an extension cover part 39 extending toward the rear end of the cover top plate 20 and the ground leveling body 22.
The upper part of the leveling plate 23 is covered.

A support member 40 is attached to the lower portion of the elastic cover body 35 by the plurality of bolts and nuts 38. This support 40 is a plurality of support plates that are long in the left-right direction.
41, and the plurality of support plates 41 are the elastic cover members 35.
Abutting piece 42 supported by the bolts and nuts 38 in a state of abutting on the lower side portion of the abutting piece 42 and tilting downward and rearward from the rear end portion of the abutting piece 42. It has a protruding guide piece 43 and is formed in a substantially V shape in side view.

By attaching the rear side portion of the elastic cover body 35 to the rear end portion of the cover top plate 20 with the plurality of bolts and nuts 38 through the contact pieces 42 of the respective support plates 41. The extension cover portion 39 is curved in a concave arc shape protruding rearward by the guide protrusion 43 of each of the support plates 41, and the curved portion 44 is a concave recess formed in the upper portion of the ground plate 23. Part 24
The curved portion 44 is disposed and supported along the inner side thereof, and the lower side portion of the curved portion 44 is disposed and supported along the inner side of the ground plate 23 which is continuous with the lower portion of the concave portion 24.

Further, since the extension cover portion 39 is supported by the guide protrusion 43 of each support plate 41, the extension cover portion 39 is
The lower end portion of the ground leveling plate 23 is arranged so as to extend to a substantially middle portion of the inner side portion of the ground leveling plate 23 in the vertical direction. The curved portion 44 of the extension cover portion 39 is provided along the concave portion 24 of the ground leveling plate 23, so that the curved portion 44 and the rear upper portion of the rotation locus of the rotary tiller 14 are provided. A soil receiving space 45 is formed which is larger than the space between the substantially middle portion of the leveling plate 23 in the vertical direction and the rear side portion of the rotation locus of the rotary tiller 14.

Next, the operation of the above embodiment will be described.

The three-point connecting portion of the machine frame 1 is connected to the three-point suspension mechanism of the tractor, and the input shaft 5 of the mission 6 is connected to the PTO shaft of the tractor via a power transmission shaft.
When the machine frame 1 is pulled by the tractor and the input shaft 5 is rotated by the output from the PTO shaft of the tractor, the output shaft of the mission 6 and the transmission case 4 are rotated.
The rotary tiller 14 is rotationally driven in the downcut direction through the interlocking medium therein.

Then, each tillage claw of this rotary tiller 14
While the soil in the field is sequentially cultivated at 17, the cultivated soil that is flipped up by each of the tilling claws 17 of the rotary cultivable body 14 is successively thrown toward the leveling plate 23 of the leveling body 22, while The cultivated soil is a leveled body 22 towed by the progress of the machine frame 1.
While being received by the front lower part of the leveling plate 23 and the curved part 44 of the extension cover part 39 of the elastic cover body 35, these tillages are directed from the extension cover part 39 to the lower front side of the leveling plate 23 of the leveling body 22. Be dropped.

At this time, the extension cover portion of the elastic cover body 35 is caused by the earth pressure of the tilled soil which is sequentially thrown from the rotary tiller 14.
39 is pressed toward the leveling plate 23, and the extension cover portion 39 of the elastic cover body 35 causes the plowing soil to enter and be clogged between the upper end of the leveling plate 23 and the rear end portion of the fixed cover body 18. Is prevented. Further, the elastic action of the extension cover portion 39 prevents the tillage soil from attaching to the extension cover portion 39.

Further, the concave arc-shaped curved portion 44 of the extension cover portion 39.
At the same time, the tilled soil released from the rotary tiller 14 is received, and the tilled soil is dropped from the extension cover portion 39 toward the lower front side of the ground leveling plate 23.

Further, a concave arc-shaped curved portion 44 of the extension cover portion 39.
And a rear upper portion of the rotary locus of the rotary tiller 14, there is a soil receiving space 45 that is larger than the interval between the vertical middle portion of the leveling plate 23 and the rear side of the rotary locus of the rotary tiller 14. Since it is formed, the rotary tillage in this earth receiving space 45
The soil of the cultivated soil released from each of the 14 plowing nails 17 is well separated,
In this soil receiving space 45, the tillable soil radiated from each tilling claw 17 of the rotary tiller 14 is received, and the tillage resistance does not increase because the tillage is not carried around so much, and therefore the rotary tiller 14 is provided. It is possible to prevent the tilling soil, which is flipped up by each of the tilling claws (17), from clinging to the extension cover portion (39).

A plurality of support plates 41 supporting the rear side of the elastic cover body 35 are abutting pieces 42 supported by bolts and nuts 38 in a state of being inclined rearward and downward, and the abutting pieces 42.
The plurality of support plates 41 are formed along the cover top plate 20 because the support plates 41 are formed in a substantially V-shape when viewed from the side, having the guide protrusions 43 that are inclined and projected rearward and upward from the rear end portion. Since it is located on the arc-shaped extension line of the elastic cover body 35 that is arranged as the above and does not project toward the rotation locus of the rotary cultivator body 14, the rotation locus of the rotary cultivator body 14 is defined by the plurality of support plates 41. The space is not narrowed, the soil of the cultivated soil released from each plowing claw 17 is well separated, and clogging of the cultivated soil is prevented.

Then, the ground leveling body 22 is vertically rotated about the support shaft 31 of the hinge 21 with the rear end portion of the cover top plate 20 of the fixed cover body 18, and the ground leveling plate 23 of the ground leveling body 22 is rotated. The cultivated soil that is successively squirted from each of the plowing claws 17 of the rotary cultivating body 14 is leveled in order.

Further, the tilled soil carried by each tilling claw 17 of the rotary tiller 14 is directed toward the elastic cover body 35 arranged along the lower side of the cover top plate 20 of the fixed cover body 18. Although it is thrown, the elastic action of the elastic cover body 35 prevents the cultivated soil from attaching to the elastic cover body 35.

At this time, the extension cover portion 39 of the elastic cover body 35
The lower end of the upper part of the ground leveling plate 23, that is, by being arranged to extend to a substantially middle part in the vertical direction of the ground leveling plate 23,
The extension cover portion 39 is not pulled by the cultivating soil at the time of the leveling operation by the leveling plate 23, and the cultivating soil is leveled smoothly by the leveling plate 23.

Next, in the above-described embodiment, the case where the support tool 40 for supporting the extension cover portion 39 is composed of a plurality of support plates 41 arranged in the left-right direction and long in the left-right direction has been described, but the present invention is not limited to this. As shown in FIG. 4, the tool 40 is composed of a plurality of support pieces 46 which are long in the front-rear direction, and the support pieces 46 are arranged in the left-right direction at predetermined intervals. As in the case of the embodiment, it is attached to the rear end portion of the cover top plate 20 via the elastic cover body 35 with the bolt and nut 38.

In this case, each support piece 46 is supported by the bolts and nuts 38 in a state in which it abuts the lower side of the elastic cover body 35 and inclines rearward and downward as in the case of the above embodiment. The contact piece portion 47 and the guide projection piece portion 48 that is inclined and protruded rearward and upward from the rear end portion of the contact piece portion 47 are formed in a substantially V shape in a side view.

With this configuration, each support piece is
The extension cover portion 39 is curvedly formed in a concave arc shape projecting rearward by the guide protrusion piece 48 of 46, and the curved portion 44 is the ground leveling plate.
It is installed along the concave portion 24 of 23. A large soil receiving space 45 is formed between the curved portion 44 and the upper rear portion of the rotary locus of the rotary tiller 14 in the same manner as in the above-described embodiment, and each plowing pawl is formed in the soil receiving space 45. The soil is well removed from 17 and clogging is prevented.

Next, in each of the above-mentioned embodiments, each support plate 41 and each support piece 46 of the support tool 40 are arranged on the lower side of the elastic cover body 35, and the bolts and nuts 38 are used to cover the rear side of the cover top plate 20. Although the case of attaching to the end portion has been described, the present invention is not limited to this, and each support plate 41 and each support piece 46 are integrally attached to the upper portion of the extension cover portion 39 with an adhesive 49 as shown in FIG. The extension cover portion 39 is curved and formed in a concave arc shape projecting rearward by the support plates 41 and the support pieces 46.
Is installed along the concave portion 24 of the ground leveling plate 23.

With this structure, a large soil receiving space 45 is formed between the curved portion 44 and the upper rear portion of the rotary locus of the rotary tiller 14 as in the case of the above-described embodiment. In the soil receiving space 45, soil is well separated from each tilling claw 17 and clogging is prevented, and each support plate 41 and each support piece 46 is located on the upper side of the extension cover portion 39. The plate 41 and each support piece 46 have a rotary cultivated body.
It is prevented that the tilling soil thrown from each of the 14 tilling claws 17 is attached.

Further, in each of the above-described embodiments, each support plate 41 and each support piece 46 of the support tool 40 are disposed on the lower side portion of the elastic cover body 35 and the upper side portion of the extension cover portion 39, and the bolts and nuts 38 are provided. Although the case where the cover top plate 20 is attached to the rear end of the cover top plate 20 has been described above, the support plates 41 and the support pieces 46 are not limited to this and are embedded in the extension cover part 39 as shown in FIG. You may make it shape | mold. Then, the extension cover portion 39 is curvedly formed in a concave arc shape projecting rearward in each support plate 41 and each support piece 46, and the curved portion 44 is provided along the concave recess portion 24 of the ground plate 23.

Further, each support plate 41 and each support piece of the support tool 40
46 is formed of an elastic member, and each support plate 41 and each support piece
At 46, the extension cover portion 39 is constantly urged and joined toward the front surface portion of the ground leveling plate 23 including the recessed portion 24 of the ground leveling plate 23 so that the extension cover portion 39 follows the vertical rotation of the ground leveling plate 23. You may With this configuration, the extension cover part
Soil can be more reliably prevented from entering between the 39 and the leveling plate 23.

[0048]

According to the invention of claim 1, the elastic cover body covering the upper part of the rotary cultivating body has an extension cover portion extending toward the ground leveling body, and the extension cover portion serves as a fixing cover body. Since the space between the rear end and the top of the ground leveling body is covered, the extension cover part of the elastic cover body prevents the fixed cover body from being attached to the lower side part of the fixed cover body. It is possible to reliably prevent clogging of the tilling soil, which is sprung up by the rotary tiller, between the rear end portion and the upper end portion of the soil tillage body, and to secure smoothness of vertical rotation of the soil tillage body. The extension cover part does not narrow the space between the rotary tillage body and the rotation track of the rotary tillage and does not clog the soil.The extension cover part is formed by extending the elastic cover part. The plowing soil is attached to the extension cover by It is possible to prevent that, it is possible to reliably guide the tilling soil towards the lower part of the leveling member from the extended cover.

According to the second aspect of the present invention, the extension cover portion is curved along the rear end portion of the fixed cover portion in the shape of a concave arc protruding rearward and is supported along the ground leveling body. Therefore, a soil receiving space is formed above and behind the rotary cultivator in the concave arc-shaped curved portion of the extension cover, and the soil receiving space allows the cultivated soil to be lifted up by the rotary cultivator well, and the cultivating soil is well separated. It is possible to reliably prevent the extension cover part from being caught in the rotary cultivating body because the rotation of the cultivator is small and the cultivating resistance does not increase.

According to the third aspect of the present invention, the lower end of the extension cover portion of the elastic cover body is extended to a substantially middle portion of the inner side of the ground leveling body in the vertical direction. It is possible to prevent the tilling soil from adhering to the upper part of the soil leveling body without pulling the extension cover portion, and therefore the soil tilling soil can be leveled smoothly while the soil leveling body smoothly rotates up and down with a simple structure.

[Brief description of drawings]

FIG. 1 is a side view of a rotary tiller according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same cover body and ground leveling body.

FIG. 3 is a perspective view of the rotary cultivating device of the above.

FIG. 4 is a perspective view of a support according to another embodiment.

FIG. 5 is a perspective view of a support according to still another embodiment.

FIG. 6 is a perspective view of a support according to still another embodiment.

[Explanation of symbols]

 1 Machine frame 14 Rotary tiller 18 Fixed cover 22 Leveling ground 35 Elastic cover 39 Extension cover 40 Support tool 44 Curved part

Claims (3)

[Claims] 1. A machine frame, a rotary cultivator rotatably provided on the machine frame, a fixed cover body provided on the machine frame above the rotary cultivator body, and the rotary cultivator body. And a ground leveling body that is disposed rearward of the fixed cover body and is pivotally supported in the rear end portion of the fixed cover body so as to be vertically rotatable, and above the rotary tillage body that is disposed along the lower side portion of the fixed cover body. The elastic cover body has an extension cover portion extending toward the ground leveling body, and the rear end portion of the fixed cover body and the ground leveling body are provided at the extension cover portion. A rotary tilling device, characterized in that a space is provided between the upper end of the rotary tiller and the upper end. 2. The elastic cover body has its front end portion attached to the front end portion of the fixed cover body, and its extension cover portion is attached to the rear end portion of the fixed cover body by a support tool which faces rearward. The rotary tiller according to claim 1, wherein the rotary tiller is curved along a protruding concave arc and supported along the ground leveling body. 3. The rotary tillage according to claim 1, wherein a lower end portion of the extension cover portion of the elastic cover body is arranged so as to extend to a substantially middle portion of an inner portion of the ground leveling body in a vertical direction. apparatus.