JPH08294302A - Ridging device in power tiller - Google Patents

Abstract

PURPOSE: To minimize a shock to an operator and to improve safety of control in backward traveling in turning of a tilling column toward the rear when a power tiller is traveled backward (backward traveling). CONSTITUTION: This tilling device comprises a triangular tilling column A in which large area parts 1 of three faces and small area parts 2 of three faces are alternately continued. Corner parts between the small area parts 2 and the large area parts 1 at both sides of the small area parts 2 form forward side small corner parts Cf and backward side large corner parts Cb, respectively. Ridging plates 10 are installed at given intervals around the triangular tilling column A, the triangular tilling column A is equipped with the ridging plates 10 at given intervals and the ridging plates 10 can be properly protruded and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention minimizes the impact on workers during the backward traveling of the tiller when the vehicle is traveling backward (reverse traveling), thus ensuring the safety of maneuvering during backward traveling. The present invention relates to a soil tilling device for a tiller that can be improved.

[0002]

2. Description of the Related Art Conventionally, tillers mounted on both sides of a drive case of an agricultural power traveling machine such as a tiller and a tractor,
There are various types of tillage tubes supported on both sides by side drives, such as a round section, an octagonal section, and a hexagonal section. The round-shaped tiller itself did not have such high tilling performance at the time of tilling, and also became a major factor of increasing the tilling resistance. Also, when the cross section of the tiller is octagonal, hexagonal, etc., the soil can be slightly tilled near the corners, or the tilling resistance can be slightly reduced, but this is good. I couldn't hope for some plowing work. Therefore, the applicant has developed a cultivating tube having a triangular cross section as a solution to the above drawbacks of the conventional cultivating tube.

By the way, this cultivating tube having a triangular cross section is
Tillage resistance can be significantly reduced. Because the cultivator has a triangular cross section, the cross section can be minimized as a square cross section, and the rake angle of the triangular cultivator is the octagonal and hexagonal cross section. This is because it can be much smaller than the soil rake angle. The soil rake angle refers to the angle between the line connecting the center of the triangular tillage tube and the end of the large surface portion and the outer surface line of the cross section of the large surface portion.

Due to the small rake angle of the earth, the end portion of the large surface portion (in the vicinity of the corner portion between the large surface portion and the small surface portion) plays a role of a shredding plate, and it is possible to scoop out the soil and throw the lump of mass backward. It was done. Therefore, the conventional type of cultivator such as round type has resistance to compress against soil,
Although the condensing force acts largely to increase the tilling resistance, the triangular tilling tube can significantly reduce the tilling resistance and improve the forward movement performance. The plowing work with the triangular tillage cylinder and the soil gathering work with the soil gathering plate act synergistically to make the soil gathering and tilling efficiency extremely high. As described above, by using the triangular tillage cylinder, the driving source can be made small, or even if the soil has viscosity, the tilling work can be efficiently performed while reducing the tilling resistance.

As described above, since the triangular cultivator has a role like a plowing blade, the cultivator having the triangular cultivator can be efficiently moved forward without waste. The advantage is that, even when the vehicle is traveling backward, the triangular cultivator obtains the same rotational force as when traveling forward and travels backward as well. This back running is as powerful as moving forward.

[0006]

When the vehicle travels back by the power of the tiller, the mulch board may be rotating immediately in front of the operator, and if the operator slips or falls over. Is damaged by shreds, etc., and it is pressed against standing trees, stone walls, banks, pillars in the house, other obstacles, etc. by a tiller, and the steep slope of the end of the cultivated land, this end At the time of the work of the department, it falls with a cultivator in the valley and may die in a remarkable case, and in fact, many fatal accidents occur.

In particular, conventionally, as shown in FIG. 26, when the vehicle suddenly starts traveling backward, a large reaction force is generated due to the low rotation of the drive shaft, causing the center of gravity to move abruptly to the front side of the cultivator. With the reaction force Q, the operation handle of the cultivator is lifted and becomes substantially vertical. When the operator feels physically unstable and dangerous, he / she desperately tries to lower the operation handle and grasps the handshake part. For this reason, it is actually difficult to disengage the clutch and turn off the engine switch, and even today, accidents continue.

As described above, when the cultivator rapidly moves backward from the forward or stopped state, the cultivating cylinder kicks the soil and makes a strong movement. Therefore, an impact is transmitted to the handle operation of the worker at the time of the first backward movement. , Reaction force Q as described above
With, the operating handle of the cultivator is lifted, and the worker momentarily becomes extremely dangerous. This is because, as described above, the tiller rotates strongly while strongly pushing back the soil even when the tiller moves forward even when traveling backward.

As a conventional type of tiller, FIG.
As shown in FIG. 6 (B), there is a type in which three vertices of a triangular tillage tube are formed as relatively small and flat sides, and the side that comes into contact with the soil first during back running is cut away. This is intended to reduce the resistance from the soil when running backwards, but in reality the notch part becomes sharp, the resistance from the soil becomes large, and the notch part is sharp and It is a very dangerous element.

[0010]

Therefore, as a result of earnest and repeated studies to solve the above problems, the inventor has made the present invention a triangular tillage in which three large surface portions and three small surface portions are alternately continuous. The corners of the small face portion of the cylinder and the large face portions on both sides of the small face portion are used as the forward side small corner portion and the reverse side large corner portion, respectively. By using the earth moving device in the tiller, it is possible to improve the safety of the operator without giving a sudden impact to the operator during the back traveling operation of the tiller and to simplify the structure of the tiller. The above problems are solved.

[0011]

In the triangular tillage tube A, the three large surface portions 1, 1, ... And the three small surface portions 2, 2 ,.
The corner portions formed by the large surface portions 1 and 1 on both sides of the small surface portion 2 are a forward side small corner portion Cf and a backward side large corner portion Cb, respectively. When the cultivator equipped with the soil tillage plates 10, 10, ... Arranged around the triangular cultivator A at a predetermined interval travels back on the soil from the forward or stopped state, the results are shown in FIGS. 8 to 10. As shown, in the triangular cultivator A, the rearward-side large corner portion Cb always bites into the soil ahead of the forward-side small corner portion Cf (however, the forward-side small corner portion Cf is soiled at the moment when moving from forward to back traveling and when stopped). Except if you are cutting into).

As described above, in the triangular cultivator A, the large reverse corner Cb always digs into the soil ahead of the forward small corner Cf when the vehicle is running backward, but the large reverse Cb is small on the forward side. Since it is formed larger than the corner portion Cf, as shown in FIG. 11, the biting angle with respect to the average horizontal surface of the soil becomes extremely small, and the kicking force of the soil at the large reverse-side corner portion Cb becomes extremely small. Therefore, as shown in FIG. 12, as the soil soil flows under the large rearward-side large corner portion Cb, it slips into the soil, and the triangular tillage tube A itself is in a slip state with respect to the soil. The safety can be improved without giving a big impact to the operator who operates the machine.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIGS. 1 and 2, the triangular cultivator barrel A has a substantially triangular cross section, and the three major surfaces constituting the triangular cross section are large surface portions 1, 1, .... And
At the corners of the adjacent large surface parts 1, 1, ...
2, ... are formed respectively. The large surface 1,1,
2, may have a substantially flat shape as shown in FIG. 2 or may have a convex shape and a slightly bulging shape (not shown). It is experimentally preferable that the width of the large surface portions 1, 1, ... Is about 3 times or more the width of the small surface portions 2, 2, ... As shown in FIG. It is not limited to.

At both corners formed by the respective small face portions 2 and the large face portions 1, 1 on both sides of the small face portion 2, the forward advancing direction side of an arbitrary small face portion 2 is defined as a forward side small corner portion Cf,
The backward traveling direction side is referred to as the backward traveling side large corner portion Cb (see FIG. 3). Here, in the type in which each of the reverse side large corner portion Cb and the forward side small corner portion Cf is angular, the angle θ _b of the reverse side large corner portion Cb is the forward side small side of the triangular tillage tube A in the forward direction rotating side. Corner C
It is formed to be larger than the angle θ _{f of f} . That is, (the angle θ _{b of the} reverse-side large corner Cb)> (the angle of the forward-side small corner Cf θ _f ).

Next, when adapting each the concept of rake angle in place of the reverse side the large corner Cb and the forward side small corner Cf, rake angle in the reverse side the large corner Cb First is the angle alpha _b, also forward If the rake angle at the side small corner portion Cf is an angle α _f , (rake angle α _b )
> (Rake angle α _f ) (see FIGS. 3 and 4). That is, the rake angle α _{b of} the rearward-side large corner portion Cb is larger than the rake angle α _f of the forward-side corner portion Cf, and therefore the resistance received from the soil mass is reduced. Here, the rake angle means an angle between a line connecting the rotation center O _p of the triangular cultivator A and the end of the large surface portion 1 and the outer surface line of the cross section of the large surface portion 1. That is, as the rake angle becomes smaller, the horizontal component force F _h when kicking the soil becomes larger, and similarly, the resistance received from the soil becomes larger.

As for the type of surface shape of the small face portion 2, it is formed so as to be linearly inclined from the large rearward corner portion Cb toward the small forward corner portion Cf, or is bent in an inverted V shape. (See Figure 5). Further, there is an embodiment in which the rearward-side large corner portion Cb is formed as an arc-shaped corner surface r so as to bulge outward in a substantially arc-shape. In the arc-shaped corner surface r, the small surface portion 2 and the large surface portion 1 change gently at the reverse side large corner portion Cb, that is, the angle θ _b becomes approximately 180 °, and the cultivator At the time of the initial movement of the back running, the triangular tillage tube A is extremely resistant to the resistance from the soil, and the arc-shaped corner surface r of the triangular tilling tube A makes it easy to slip, which softens the shock at the initial movement of the backward running. In the type to which the arc-shaped corner surface r is applied, the facet portion 2 may be inclined (see FIG. 6) or horizontal (see FIG. 7).

A state in which the triangular tiller A travels back on the soil is shown in FIGS. 8 to 10. That is, the rearward-side large corner portion Cb bites into the surface layer of the soil, and the triangular cultivator A rotates backward. However, the rearward-side large corner portion Cb has a rake angle α _f of By making it larger than the rake angle α _f of the corner Cf, even if the large reverse-side corner Cb bites into the soil, the angle of the soil with respect to the horizontal plane becomes small.

Therefore, as shown in FIG. 11, the horizontal component force F _{h of the} force of the triangular tillage tube A for kicking the soil during backward traveling is also relatively small, and therefore the resistance from the soil can be extremely reduced. Then, as shown in FIG. 12, the soil moves as if it flows under the large rearward-side corner portion Cb of the triangular cultivating cylinder A, and the triangular cultivating cylinder A temporarily becomes a slip state at the time of the initial back running. Therefore, when the cultivator travels backward, the reaction force received from the soil can be weakened, and the impact caused thereby can be made extremely small, so that the safety of the worker operating the cultivator at the time of the initial movement in the backward travel can be improved.

On the other hand, when the cultivator moves forward, the rake angle α _f of the forward side corner portion Cf is smaller than the rake angle α _{b of the} reverse side large corner portion Cb. The angle formed by the part Cf and the average horizontal plane of the soil becomes large, and therefore the horizontal component force F _h when kicking the soil also becomes large, and the forward side small corner part Cf can strongly move backward as if it kicks the soil strongly. (Figs. 13 and 14
reference).

At the center of the triangular tiller A, as shown in FIG.
As shown in FIG. 2, the rotary shaft portion 9 is provided in a penetrating manner. An input through hole 9a is formed in the rotary shaft portion 9, and the traveling drive shaft 1 protruding from the chain case 12 of the cultivator
3 can be connected and inserted. The input through hole 9a of the rotary shaft portion 9 is adapted to the cross-sectional shape of the drive shaft 13 for traveling, specifically, a polygonal type such as a hexagonal shape (see FIGS. 1 and 2 etc.). ), Or a spline shape. FIG. 26 shows a state in which the triangular cultivating cylinder A of the present invention is mounted on the traveling drive shaft 13 of the cultivator.

Next, as shown in FIG. 1 and FIG. 2, the triangular tillage cylinder A is provided with the earth gathering plates 10 and 1 at predetermined intervals around its circumference.
0, ... Are provided. The earth moving plates 10, 10, ... Are provided with a plurality of holders A ₁ , A ₁ ,.
Be attached to. One holder A ₁ is equipped with one earth-moving plate 10, and the earth-moving plate 10 is protruded by an appropriate amount to the outside of the triangular cultivating cylinder A and can be fixed (see FIG. 15). In this way, the earth gathering plate 10 can be projected from the triangular tillage tube A and can be appropriately fixed in order to prevent a decrease in the earth gathering work efficiency due to abrasion of the earth gathering plate 10 and to appropriately adjust the depth of the earth gathering. It is in. Figure 24 shows
It shows the wear of the earth gathering plate 10, and shows the state where the earth gathering plate 10 is worn in a plan view.

The holder A ₁ is made up of a soil attracting plate support plate 5 made of a relatively thick metal plate material and a mounting portion 6 formed on the soil attracting plate support plate 5. Its holder A
The mounting portion 6 of ₁ is a through-hole-shaped member,
0 to the earth gathering plate support plate 5 and fasteners 11 such as bolts and nuts
It is fixed through the. There are various embodiments of the mounting portion 6 of the holder A _1. As the first embodiment, as shown in FIGS. 16 and 17, a plurality of diamond-shaped through holes 6a, 6a, ... Are continuously formed. It was done. Further, specifically, the diamond-shaped through holes 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6a, 6 are continuously formed so that the adjacent diamond-shaped through holes 6a, 6a,
The pitch dimension of a, ... Is reduced.

Fastener 11 used in the above embodiment
As shown in FIG. 17, the types of bolts 11a are
An approximately cubic prismatic base portion 11a ₁ is formed at the base of the screw portion, and the rectangular base portion 11a _{1 has} the same cross-sectional shape as the diamond-shaped through hole 6a and is slightly smaller than the diamond-shaped through hole 6a. The rectangular base 11a ₁ can be inserted into the diamond-shaped through hole 6a. And holder A ₁
When attaching the soil gathering plate 10 to the bolt 11, the bolt 11a is prevented from idling when the nut 11b is tightened. As described above, the mounting portion 6 of the first embodiment is formed by continuously connecting a plurality of diamond-shaped through holes 6a, 6a, ..., And the bolt 11a of the fixing tool 11 is a continuous diamond-shaped through hole. The rectangular base 11a ₁ is inserted into only one of 6a, 6a, .... Then, by inserting the square base portion 11a ₁ of the bolt 11a into the appropriate diamond-shaped through hole 6a, it is possible to adjust the projecting amount of the shredding plate 10 from the triangular tillage tube A in stages. .

Next, as a second embodiment of the mounting portion 6, as shown in FIG. 15, a circular through hole 6b is used.
At least two circular through holes 6b are formed in one mounting portion 6 so that the amount of protrusion of the earth moving plate 10 from the triangular cultivating cylinder A can be adjusted stepwise.
Further, the circular through hole 6b is formed in the bolt 1 of the fastener 11.
A through hole having a play larger than the screw diameter of 1a (stupid hole), the screw portion of the bolt 11a moves in the circular through hole 6b, and the mounting range of the shredding plate 10 can be finely adjusted. There are also things to do.

As a modification of the mounting portion 6 of the second embodiment, there is an embodiment in which the mounting portion 6 is formed as a long hole 6c as shown in FIG. In this embodiment, the projecting amount of the earth gathering plate 10 can be adjusted steplessly by the elongated hole 6c. In addition, as shown in FIG. 19, there is also a type in which one of the two elongated holes 6c and 6c has a larger play than the other. This is the earth moving board 10
The structure allows for fine adjustment in the vertical direction orthogonal to the protruding direction of. Further, in the type in which the mounting portion 6 has the long hole 6c,
There are embodiments in which the long diameter direction of the long hole 6c is inclined (see FIGS. 18 and 19) or horizontal (see FIG. 20).

Next, the earth gathering plate 10 is composed of a blade base 10a and a blade portion 10b. As shown in FIGS. 1 and 16, the blade portion 10b is formed in a substantially fan shape in plan view. It is formed on a flat curved surface. At the blade base 10a,
A plurality of fixing through holes 10c, 10c, ... Are formed. Two of the fixing through holes 10c, 10c, ... Are often formed. Further, the fixing through hole 10c is a circular through hole, but if necessary, as shown in FIG.
It may be a long hole type having a long diameter horizontal or inclined.

The blade edge 10a of the earth closing plate 10 is brought into contact with the mounting portion 6 forming portion of the holder A ₁ , and the fixing through holes 10c, 10c, ... Formed in the blade edge 10a and the long hole 6a of the mounting portion 6 are formed. , 6a, ... and the like in position so that the fastener 1
The blade edge 10a of the earth gathering plate 10 is fixed to the holder A ₁ by the first bolt 11a and the nut 11b. Then, by loosening the fixing tool 11, the earth moving plate 10 is placed in the triangular cultivating tube A.
It is possible to make it slidable within the permissible range of the mounting portion 6, and set the earth shifting plate 10 to a desired state, and tighten the fixing tool 11 provided on the triangular tillage tube A to tighten the earth shifting plate 10. It is something that is fixed.

Next, referring to FIGS. 1 and 15, the earth moving work radius between the earth moving boards 10, 10, ... And the triangular cultivating tube A will be described. Assuming that the state of being fixed in the most retracted state is the standard tilling state, the center of rotation of the triangular tilling cylinder A is the rotation center O _p, and the radius R _{O of the} standard earth-filling work virtual circle C _O at this time. And Further, the radius R _M of the maximum earthing up working virtual circle C _M of being fixed by maximally protrudes from the earthing up plate 10 triangular plow tube A.

The earth retaining plate supporting plate 5 constituting each holder A ₁ is provided in such a manner that it crosses the triangular cultivating cylinder A at a substantially right angle and has a slight twist while having a slight twist. (See FIG. 22). Therefore, when the earth retaining plate 10 is attached to the earth retaining plate support plate 5, the earth retaining plate 1
0 is also attached with a slight twist with respect to the axial direction of the triangular cultivator A. When the earth gathering plate 10 is projected from the earth gathering plate support plate 5 to the outside of the triangular tillage tube A, not only does it protrude outward than when it is most retracted, but also the earth gathering angle of its tip becomes large. For example, assuming that the earth pulling plate 10 is pulled out to the amount δ in order to change the state from the most retracted state to the most protruded state, the earth gathering angle β ₁ is set when the earth retracting plate 10 is most retracted, and the earth bringing angle when the earth gathering plate 10 is most protruded is set. When β ₂ is set, the soil gathering angle β ₂ > the soil gathering angle β ₁ (see FIG. 23). That is, by projecting the earth gathering plate 10 outward from the triangular tillage cylinder A, the earth gathering depth can be deepened and the earth gathering angle can be increased, so that the efficiency of the earth gathering operation can be improved.

Further, each earthing plate 10 is provided with wear scales 10m, 10m, ... For measuring the degree of wear (see FIG. 15). The wear scale 10m, 10
m, ... Are arranged in a direction orthogonal to the longitudinal direction of the blade portion 10b and may be formed in a stamped shape, or may be marked with a paint agent or the like. Then, it is possible to visually observe how the earth gathering plate 10 is gradually worn by the earth gathering work, and when the wear reaches a constant wear scale 10 m, the earth gathering plate 10 can be used as a guide for projecting in the longitudinal direction or replaced. The time can be properly judged.

Each of the triangular tillage tubes A according to the present invention has a rotary shaft portion 9, and the rotary shaft portion 9 has an input through hole 9a. The drive shaft 13 for traveling, which projects from the lower part of the chain case 12 of the cultivator, has the input through hole 9a.
It can be inserted into and fixed with a pin or the like. The traveling drive shaft 13 has a polygonal cross section (generally, a hexagonal shape in general) or a spline shaft shape. The input through hole 9a has a shape corresponding to the cross-sectional shape of the traveling drive shaft 13. FIG. 25 shows a state in which the triangular cultivating cylinder A is mounted on the traveling drive shaft 13 of the cultivator.

[0032]

According to the first aspect of the present invention, the small face portion 2 of the triangular tillage tube A in which the three large face portions 1, 1, ... And the three small face portions 2, 2 ,. The corner portions with the large surface portions 1 and 1 on both sides of the small surface portion 2 are respectively defined as a forward side small corner portion Cf and a backward side large corner portion Cb, and the earth gathering plates 10, 10, around the triangular tillage pipe A at predetermined intervals. …
By using the soil tilling device in the cultivator, firstly, the efficiency of the soil tilling work can be improved when moving forward, and secondly, the safety of the worker at the time of the initial movement of the back traveling of the tiller is improved. You can

To explain the above effect in detail, when the cultivator moves forward, the forward side corner portion Cf is the reverse side large corner portion C.
Since it is smaller than b, the angle formed between the forward small corner Cf and the average horizontal plane of the soil is large, and therefore the horizontal component force F _h when kicking the soil is also large, and the small forward corner Cf moves the soil. Kick backwards and move forward,
It is possible to improve the soil gathering work efficiency of the soil gathering plates 10, 10, ... Attached to the triangular tillage cylinder A.

Next, when the vehicle is running backwards, the large reverse-side corner Cb is formed larger than the small forward-side corner Cf, so that the small forward-side corner Cf cuts into the soil to move forward. In comparison, even if the rearward-side large corner portion Cb bites into the soil, the angle formed by the average horizontal plane of the soil becomes extremely small. That is, as shown in FIG. 11, the horizontal component force F _{h by} which the large reverse-side corner Cb kicks the soil becomes extremely small, or, as shown in FIG. 12, the soil of the soil is located below the triangular tillage tube A. It flows so as to crawl, and the triangular tillage cylinder A temporarily turns into an idling state in the initial movement of the back running. Therefore, it is possible to prevent a large impact on the operator who operates the cultivator, and it is possible to reduce the risk of the operator's operation. Therefore, the safety of the worker can be improved.

Next, the invention according to claim 2 is the earth-moving device in a cultivator according to claim 1, wherein the facet portion 2 is formed to bulge into a flat mountain shape along the rotation direction. The angle θ _b of the reverse side large corner portion Cb can be made relatively large as compared with the case where 2 is linearly inclined from the reverse side large corner portion Cb toward the forward side small corner portion Cf. Further, by increasing the angle θ _b of the large corner portion Cb on the reverse side, it is possible to further reduce the impact given to the operator who operates the steering wheel during the initial movement of the back traveling.

Next, according to the invention of claim 3, in claim 1, the large reverse corner Cb is an earth moving device in a cultivator in which the large corner portion Cb on the reverse side is an arcuate corner surface swelling outwardly. The large side corner portion Cb has a substantially horizontal shape, and by having a smooth surface, it is more difficult to bite into the soil as compared with a case where the rearward side large corner portion Cb has a corner shape, and it runs backwards. It is possible to reduce the resistance from the soil at the time of time as much as possible and increase the slip state of the triangular tillage tube A to reduce the impact given to the operator who operates the steering wheel during the initial movement of the back travel.

Next, the invention of claim 4 is based on claim 1, wherein the triangular tillage cylinder A is provided with a predetermined distance from the earth shifting plate 1.
.. are provided, and the earth shredding plates 10, 10, ... Are used as the earth shredding device in the cultivator capable of appropriately projecting and fixing, so that the earth shredding plates 10, 10 ,. It can be used, and secondly, effects such as fine adjustment of the depth of soil can be achieved.

To explain the above effect in detail, in the present invention, the soil tillage plates 10, 10, ... Are appropriately protruded from a predetermined position in the triangular cultivating cylinder A, and at each appropriate position thereof. Since the earth moving board 10 is structured so that it can be fixed, even if the earth moving board 10 is worn due to long-term use, it is fixed by projecting outward from the triangular tillage tube A by the amount of wear. By doing so, it can be continuously used in the same manner.

As a result, in the conventional type, even if the earth gathering plate is slightly worn by the earth gathering work, and there is no other inconvenience in the earth gathering work, the earth gathering depth is equal to the worn amount. However, it is very uneconomical to replace the earth moving plate with a new one, but in the present invention, the earth moving plate 10 is used for the earth moving operation. Even if it wears out, it is possible to secure a sufficient earthing depth by projecting outwardly from the triangular tillage tube A by the amount of the wear, and it is possible to use the earthing board 10 without waste and replace it with a new one. It is economical because you can extend the period.

Further, in the present invention, when the earth moving plate 10 is worn, not only is the amount of wear worn to project outward from the triangular tillage tube A to obtain the necessary earth moving depth, but the earth moving plate 10 is Even if it is not worn, it can be finely adjusted as appropriate by projecting it to the outside of the triangular tillage cylinder A and using it. Conventionally, it has been necessary to replace the soil adhering plates of different sizes according to the desired soil adhering depth, but in the present invention, the soil adhering depth is changed by only one type of the soil adhering plate 10. It is possible to increase the amount of soil replenishment.

[Brief description of drawings]

FIG. 1 is a plan view of the present invention.

FIG. 2 is a perspective view of the present invention.

[Fig. 3] Plan view of the triangular tillage cylinder

[Figure 4] Enlarged view of the main parts of the triangular tillage cylinder

FIG. 5 is an enlarged view of an essential part showing the shape of a facet of a triangular tillage tube.

FIG. 6 is an enlarged view of a main part showing a modified row of the shape of the facet of the triangular tillage tube.

FIG. 7 is an enlarged view of an essential part showing a modified row of another shape of the facet of the triangular tillage tube.

FIG. 8 is a schematic view showing a state in which the triangular tillage cylinder starts reverse rotation.

FIG. 9 is a schematic view showing a state in which a large corner portion on the reverse side starts to bite into the soil.

FIG. 10 is a schematic view showing a state where the facet has started to bite into the soil.

FIG. 11 is an enlarged view showing a state in which the large corner portion on the reverse side bites into the soil in the reverse state.

FIG. 12 is an enlarged view showing a state in which soil flows under a large corner portion on the reverse side in a reverse state.

FIG. 13 is an enlarged view showing a state where the small corner portion on the forward side bites into the soil in the forward state.

FIG. 14 is an enlarged view showing a state where the small corner portion on the forward side kicks the soil in the forward state.

FIG. 15 is an enlarged view showing a state where the earth gathering plate is most retracted from the holder and a state where it is most outwardly projected.

FIG. 16 is a front view of an embodiment in which a holder mounting portion has a rhombic through hole.

FIG. 17 is a perspective view of an essential part of an embodiment in which a holder mounting portion has a rhombic through hole.

FIG. 18 is a front view of an embodiment in which a holder mounting portion has a long hole.

FIG. 19 is a front view of an embodiment in which a holder mounting portion is an elongated hole with a play.

FIG. 20 is a front view of an embodiment in which a holder mounting portion has a horizontal elongated hole.

FIG. 21 is a front view of an embodiment in which the fixing through hole of the earth gathering plate is a long hole.

FIG. 22 is a schematic perspective view of a triangular tillage tube with a shredding plate attached.

FIG. 23 is an enlarged view showing a state in which the earth closing plate is attached to the holder.

FIG. 24 is a plan view of the worn earth moving plate.

FIG. 25 is a schematic view of an embodiment in which a cultivator is provided with a triangular cultivating cylinder equipped with an earth moving plate.

FIG. 26 (A) is a schematic view showing a state of operation of a conventional technique. (B) is a schematic view of a conventional type tiller.

[Explanation of Codes] A ... Triangular tillage cylinder 1 ... Large surface portion 2 ... Small surface portion Cf ... Forward side small corner portion Cb ... Reverse side large corner portion r ... Arc-shaped corner surface 10 ... Earthing plate

Claims (4)

[Claims] 1. A corner portion between a small surface portion of a triangular tillage tube and a large surface portion on both sides of the small surface portion, in which a large surface portion of three surfaces and a small surface portion of three surfaces are alternately continuous, are respectively formed on a forward side small corner portion and a backward side. A mulching device for a cultivator, which has large corners and is provided with mulching plates around the triangular cultivating cylinder at predetermined intervals. 2. The earthmoving device for a cultivator according to claim 1, wherein the small face portion is formed to bulge into a flat mountain shape along a rotation direction. 3. The earthmoving device for a cultivator according to claim 1, wherein the rearward-side large corner portion is an arc-shaped corner surface that bulges outward. 4. The soil tilling device for a tiller according to claim 1, wherein the triangular tillage cylinders are provided with earth gathering plates at predetermined intervals, and the earth gathering plates can be appropriately projected and fixed.