JP3017476U - Cultivator in a tiller - Google Patents

Abstract

(57) [Abstract] [Purpose] When performing back travel (reverse travel), minimize the impact on workers during the rotation of the tiller toward the rear, and improve the safety of maneuvering during back travel. thing. [Structure] Three large surface parts 1, 1, ... and Three small surface parts 2,
The triangular cultivator barrel A, in which 2, ... The corner portions between the small face portion 2 and the large face portions 1 and 1 on both sides of the small face portion 2 are referred to as a forward side small corner portion Cf and a reverse side large corner portion Cb, respectively. Further, the cultivating blades 10, 10, ... Are provided around the triangular cultivating cylinder A at predetermined intervals. The plowing blades 10, 10, ... Can be appropriately projected and fixed along the blade tip direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention makes it possible to improve the safety of maneuvering while traveling backward by minimizing the impact on the worker during the backward traveling of the tiller when performing backward traveling (reverse traveling). Regarding the tiller in the machine.

[Prior art]

[0002] Conventionally, there are various types of tillers mounted on both sides of a drive case of an agricultural power traveling machine such as a tiller and a tractor, such as a round cross section, an octagon cross section, and a hexagon cross section. There is. 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 tilling tube is octagonal, hexagonal, etc., it is possible to slightly till the soil near each corner and slightly reduce the tilling resistance, but with this, I could not hope for good tilling work. Therefore, the applicant has developed a tiller with a triangular cross section as a solution to the drawbacks of the conventional tiller.

By the way, the cultivating tube having a triangular cross section can remarkably reduce the cultivating resistance. Because the cultivator has a triangular cross section, the cross section can be minimized when it has a rectangular cross section, and the soil rake angle of the triangular cultivator has an octagonal cross section and a hexagonal cross section. This is because it can be much smaller than the soil rake angle. The soil rake angle is 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.

With this small soil rake angle, the end portion of the large surface portion (near the corner corner portion of the large surface portion and the small surface portion) plays a role of a plowing blade, and while scooping the soil, the clay mass can be thrown backward. It is what Therefore, conventional type round tillers have a large resistance to compress against soil and a large amount of condensing force to increase the tilling resistance.However, the triangular tillers have a significantly higher tilling resistance. It can be reduced and the forward performance can be improved.

Further, by performing the function of the plowing blade as described above, it was originally necessary to cut the soil, hold the clod of soil, and throw the soil rearward only by the plowing blade. The imaginary circle of the cylinder is already cultivated, so that only the outer periphery is cultivated by the cultivating blade, and the cultivating resistance such as cutting resistance can be remarkably reduced. The cultivating work by the triangular cultivating cylinder and the cultivating work by the cultivating blade act synergistically to make the cultivating efficiency extremely high. In this way, the use of a triangular tillage tube allows the drive source to be made small, or even when the soil has a viscosity, the tilling work can be made efficient while reducing the tilling resistance. is there.

As described above, the triangular tiller has a role like a tilling blade. Therefore, when the cultivator having the triangular tiller is moved forward, the advance is performed efficiently without waste. The advantage of this is that, even when traveling backward, the triangular tiller travels backward with the same lean torque as in forward traveling. This back running is as powerful as moving forward.

[0007]

[Problems to be solved by the device]

 When traveling backwards due to the power of the tiller, the tiller blade may be rotating immediately in front of the operator.If the operator slips or falls, stagger the body with the tiller blade or the like. It is damaged by the cultivator and is pressed against standing trees, stone walls, banks, pillars in the house, other obstacles, etc., and also on the steep slope of the end of the cultivated land, when working on this end, cultivating the valley. It may fall with the aircraft and die in extreme cases, and many fatal accidents have actually occurred.

Particularly, in the conventional art, as shown in FIG. 29, when the back running is suddenly started, the drive shaft may be low in speed, so that a large reaction force is generated. Moves, and the reaction force Q raises the operating handle of the cultivator to make it almost vertical. When a worker is physically unstable and feels dangerous, he / she desperately tries to lower the operation handle and grasps the handshake part. Therefore, it is actually difficult to disengage the clutch and turn off the engine switch, and even today, accidents are constant.

As described above, when the cultivator makes a rapid backward movement from the forward or stopped state, the tiller makes a strong movement by kicking the soil, and therefore an impact is transmitted to the handle operation of the worker during the initial movement of the backward traveling. As described above, the operating force of the tiller is lifted by the reaction force Q, and the worker momentarily becomes extremely dangerous. This is because, as mentioned above, the tiller rotates strongly while pushing back the soil strongly even when it moves backward even when it moves backward.

As shown in FIG. 29 (B), as a conventional type of tiller, three apexes of a triangular tiller are formed as relatively small and flat sides, so that the soil is first attached to the soil when traveling backwards. There is a type with a cutaway side. This was intended to reduce the resistance from soil during back running, but in reality the cutouts became sharp, the resistance from the soil increased, and the cutouts were sharp, so It is also a dangerous factor for

[0011]

[Means for Solving the Problems]

 Therefore, as a result of earnest studies and researches to solve the above-mentioned problems, the inventor has made the present invention the small face part and the small face part of a triangular tillage tube in which three large face parts and three small face parts are alternately continuous. The corners with the large surface on both sides of the section are the small corners on the forward side and the large corners on the reverse side, respectively, and the cultivating device in the cultivator is equipped with cultivating blades around the triangular cultivating cylinder at predetermined intervals. As a result, the worker's safety can be improved and the structure of the tiller can be simplified without giving a sudden shock to the worker during the back traveling operation of the tiller. It was done.

[0012]

[Action]

 In the triangular cultivator A, three large surface parts 1, 1, ... And three small surface parts 2, 2, ... Are alternately continuous, and the small surface part 2 and the large surface parts 1, 1 on both sides of the small surface part 2 are formed. This is a structure in which the composing corners are the forward small corner Cf and the large reverse corner Cb, respectively. When the cultivator equipped with the cultivating blades 10, 10, ... provided at predetermined intervals around the triangular cultivating cylinder A performs backward traveling on the soil from the forward or stopped state, the results are shown in Figs. As shown, in the triangular cultivator A, the reverse 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 the soil at the moment when moving from forward to back running and when stopped). (Except when you are cutting into).

As described above, in the triangular tillage cylinder A, the large reverse corner Cb always bites into the soil ahead of the forward small corner Cf when traveling backward, but the large reverse corner Cb moves forward. Since it is formed to be larger than the small side corner portion Cf, as shown in FIG. 11, the biting angle with respect to the average horizontal plane of the soil becomes extremely small, and the kicking force of the soil at the large reverse side corner portion Cb is extremely small. Become. 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 pipe A itself slips with respect to the soil. The safety can be improved without giving a big impact to the operator who operates the cultivator.

[0014]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIGS. 1 and 2, the triangular cultivating cylinder A has a substantially triangular cross section, and the three main surfaces constituting the triangular cross section are large surface portions 1, 1, ... The small face portions 2, 2, ... Are formed at the corners of the adjacent large face portions 1, 1 ,. The large surface portions 1, 1, ... 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 three times or more the width of the small surface portions 2, 2, ... As shown in FIG. It is not limited to this.

At both corners formed by the respective facets 2 and the large faces 1, 1 on both sides of the facet 2, the forward traveling direction side of any facet 2 is defined as the forward side small corner Cf, and The traveling direction side is referred to as the reverse 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 made into a square shape, the angle θ _b of the reverse side large corner portion Cb is the forward direction of the triangular tiller A and the forward side of the rotating side. It is formed to be larger than the angle θ _f of the small corner portion Cf. That is, (the angle θ _{b of the} rearward-side large corner Cb)> (the angle of the forward-side small corner Cf θ _f ).

Next, when the concept of the rake angle is applied to each of the reverse side large corner portion Cb and the forward side small corner portion Cf, first, the rake angle at the reverse side large corner portion Cb is set to the angle α _b , and the forward movement is performed. If the rake angle at the side small corner portion Cf is the angle α _f , then (rake angle α _b )> (rake angle α _f ) (see FIG. 3, FIG. 4, etc.). That is, the rake angle α _{b of} the rearward-side large corner portion Cb becomes 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 decreases, the horizontal component force F _h when kicking the soil increases, and the resistance received from the soil also increases.

As for the type of surface shape of the small face portion 2, it is formed in a straight line from the large rearward corner Cb toward the small forward corner Cf, or bulged in a flat mountain shape. (See FIG. 5). Further, there is an embodiment in which the rearward-side large corner portion Cb is formed as an arcuate corner surface r so as to bulge outward in a substantially arcuate 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 is approximately 180 °. When the cultivator is initially moving backward, the triangular cultivator A is extremely resistant to the resistance from the soil, and the arc-shaped corner surface r of the triangular cultivator A makes it easier to slip. Will be relieved. In the type in 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 tiller A rotates backward, but the rearward-side large corner portion Cb has the rake angle α _f (the forward side small Since the corner portion Cf is larger than the rake angle α _{f (} when compared with the rake angle α _f ), even if the large reverse-side corner portion Cb digs 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 by which the triangular tiller A kicks the soil at the time of traveling backward 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 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 movement in the back running. Therefore, when the cultivator travels backward, the reaction force received from the soil can be weakened, the impact caused by it can be made extremely small, and the safety of the operator operating the cultivator at the time of the initial traveling of the back cultivator can be improved. it can .

On the other hand, when the cultivator moves forward, the rake angle α _f of the forward-side corner Cf is smaller than the rake angle α _{b of the} reverse-side large corner Cb. The angle formed between 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 small corner portion Cf on the advancing side can strongly kick the soil backward and move forward. (See FIGS. 13 and 14).

As shown in FIGS. 1 and 2, a rotary shaft portion 9 is provided in a central portion of the triangular tillage cylinder A so as to penetrate therethrough. An input through hole 9a is formed in the rotary shaft portion 9 so that a traveling drive shaft 13 protruding from a chain case 12 of the cultivator can be connected and inserted. The input through hole 9a of the rotary shaft portion 9 is made to match the cross-sectional shape of the drive shaft for traveling 13, and specifically, it is of a polygonal type such as a hexagonal shape (see FIGS. 1 and 2). ) Or a spline shape. FIG. 26 shows a state in which the triangular cultivating cylinder A of the present invention is attached to the drive shaft 13 for traveling of the cultivator.

Next, as shown in FIG. 15, the triangular tillage cylinder A is provided with tilling blades 10, 10, ... Around the periphery at predetermined intervals. The plowing blades 10, 10, ... Are mounted on a plurality of holders A ₁ , A ₁ , ... Provided on the circumference of the triangular plowing cylinder A. One holder A ₁ is equipped with one plowing blade 10, and the plowing blade 10 is protruded to the outside of the triangular plowing cylinder A by an appropriate amount and can be fixed (see FIG. 16). In order to allow the plowing blade 10 to project from the triangular plowing cylinder A and to be fixed appropriately, it is necessary to prevent a decrease in plowing work efficiency due to wear of the plowing blade 10 and to appropriately adjust the plowing depth. It is in. FIG. 25 shows the wear of the plowing blade 10, (A) shows the worn state when the plowing blade 10 is seen in a plan view, and (B) shows the P ₂ -P ₂ arrow of the plowing blade 10. It is a sectional view.

The holder A ₁ is formed of a plowing blade support plate 5 made of a relatively thick metal plate and a mounting portion 6 formed on the plowing blade supporting plate 5. The mounting portion 6 of the holder A ₁ has a through-hole shape, and the plowing blade 10 is fixed to the plowing blade support plate 5 via a fixing tool 11 such as a bolt or a nut. There are various embodiments of the mounting portion 6 of the holder A _1. As the first embodiment, as shown in FIG. 17, a plurality of diamond-shaped through holes 6a, 6a, ... Are continuously formed. It is a thing. Further, specifically, the diamond-shaped through holes 6a, 6a, ... Are continuously formed so that the adjacent diamond-shaped through holes 6a, 6a ,.

As a type of the fastener 11 used in the above embodiment, as shown in FIG. 17, a substantially cubic prismatic base 11a ₁ is formed at the base of the screw portion of the bolt 11a, and the prismatic base 11a ₁ is formed. The cross-sectional shape of 11a ₁ is the same as the diamond-shaped through hole 6a and is formed to be slightly smaller than the diamond-shaped through hole 6a, and the rectangular base 11a ₁ can be inserted into the diamond-shaped through hole 6a. Then, when the plowing blade 10 is attached to the holder A ₁ , the idling of the bolt 11a is prevented during the tightening operation of the nut 11b.

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. The rectangular base 11a ₁ is inserted into only one of the shape through holes 6a, 6a, .... By inserting a rectangular base portion 1 1a ₁ of the bolt 11a in a proper rhombic-shaped through-holes 6a, thereby making it possible to adjust the pop-out amount from the triangular tilling tube A of tilling blade 10 incrementally There is. 18 (A) shows a state in which the rectangular base portion 11a ₁ of the bolt 11a is inserted into the diamond-shaped through hole 6a so that the protruding amount of the tilling blade 10 becomes the smallest with respect to the triangular tillage cylinder A ₁ . Further, FIG. 18 (C) shows a state in which the square base portion 11a ₁ of the bolt 11a is inserted into the diamond-shaped through hole 6a so that the protruding amount of the tilling blade 10 becomes the largest with respect to the triangular tillage cylinder A. . Furthermore, FIG. 18 (B) shows a state in which it is positioned between the minimum protrusion amount and the maximum protrusion amount.

Further, it is preferable for stability of the cultivating blade 10 after mounting the cultivating blade 10 that the mounting portions 6 are formed at two positions on the cultivating blade supporting plate 5 of the holder A ₁ . Alternatively, as shown in FIG. 23, when only one mounting portion 6 is formed on the plowing blade support plate 5, the auxiliary supporting portion 7 should be formed along the upper edge of the plowing blade support plate 5. There is also. Then, the upper edge of the blade edge 10a of the tilling blade 10 that comes into contact with the tilling blade support plate 5 is surrounded by a predetermined range (see FIG. 24). The plowing blade 10 is fixed to the holder A ₁ by only one mounting portion 6, and the auxiliary supporting portion 7 presses the upper edge of the blade portion 10b to prevent the plowing blade 10 from swinging. can do.

Next, as a second embodiment of the mounting portion 6, as shown in FIG. 19, a circular through hole 6b is used, and one mounting portion 6 has at least two circular through holes 6b. The structure is formed so that the amount of protrusion of the tilling blade 10 from the triangular tillage cylinder A can be adjusted stepwise. Further, the circular through hole 6b is a through hole (stupid hole) having a play larger than the screw diameter of the bolt 11a of the fixture 11, and the screw portion of the bolt 11a moves within the circular through hole 6b. In some cases, the mounting range of the tilling blade 10 may be finely adjusted (see FIG. 20).

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 tilling blade 10 can be adjusted steplessly by the long hole 6c. In addition, as shown in FIG. 22, 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 a structure that enables fine adjustment in the vertical direction orthogonal to the protruding direction of the tilling blade 10.

Next, the cultivating blade 10 is composed of a blade base 10a and a blade portion 10b. As shown in FIGS. 1 and 16 and the like, the blade portion 10b is curved in a substantially J-shape when viewed two-dimensionally. The front end is formed by gently twisting. A plurality of fixing through holes 10c, 10c, ... Are formed in the blade base 10a at appropriate intervals along the longitudinal direction. Two of the fixing through holes 10c, 10c, ... Are often formed. Further, although the fixing through hole 10c is a circular through hole, it may be a long hole type or the like if necessary.

Then, the blade edge 10a of the tilling blade 10 is brought into contact with the attachment 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 attachment portion 6 are formed. , 6a, ... And so on, the blade base 10a of the tiller blade 10 is fixed to the holder A ₁ by the bolts 11a and nuts 11b of the fixing tool 11. Then, by loosening the fixing tool 11, the plowing blade 10 can be slidable with respect to the triangular plowing tube A within the allowable range of the mounting portion 6, and the plowing blade 10 can be set to a desired state. Then, the fixing tool 11 provided on the triangular cultivating cylinder A is tightened to fix the cultivating blade 10.

Next, the plowing work radius between the plowing blades 10, 10, ... And the triangular plowing cylinder A will be described with reference to FIGS. 15 and 16. First, the plural plowing blades 10, 10 ,. When the state of being fixed in the most retracted state with respect to the tube A is the standard tilling state, at this time, the center part of the triangular tilling tube A at the time of rotation is set as the rotation center O _p , and the standard tilling work virtual circle C _O Let the radius be R _O. Further, the radius R _M of the maximum plowing work virtual circle C _M in a state where the plowing blades 10, 10, ... Are protruded to the maximum from the triangular plowing cylinder A and fixed.

Further, tilling blades 10 has a substantially J-shape in plan view as described above, the blade portion 10b while inscribed in tilling virtual circle, the tip is warped, again the center of rotation O _p Leaning to the side. The distance between the plowing work radius and the tip of the blade portion 10b is called the amount of warp. In this way, as shown in FIG. 16, when the respective tilling blades 10, 10, ... Are in the most retracted state with respect to the triangular tilling cylinder A, the tip of the blade portion 10b with the standard tilling work virtual circle C _O is formed. warpage amount L _O next, warping amount L _M becomes the maximum tilling virtual circle C _M and the blade portion 10b tip when in a state in which most projects from the triangular plow cylinder a, a comparison of these, warping amount L _M > the warped amount L _O. This is because when the plowing blade 10 is further projected to the outside of the triangular plowing cylinder A, the amount of warping is increased, and the plowing blades 10, 10, ... excavate soil soil during plowing work. The amount of waste can be increased.

In addition, each plowing blade 10 is provided with wear graduations 10m, 10m, ... For measuring the degree of wear (see the sectional views taken along arrows P ₁ -P _{1 in} FIGS. 2 and 16). The wear scales 10m, 10m, ... 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 (not shown). Then, it is possible to see how the plowing blade 10 gradually wears due to the plowing work, and when the abrasion reaches a constant wear scale 10 m, it can be used as a standard for projecting the plowing blade 10 in the longitudinal direction, or It is possible to properly determine when to replace.

Each of the triangular tillage tubes A in the present invention has a rotary shaft portion 9, and the rotary shaft portion 9 has an input through hole 9a. The traveling drive shaft 13 protruding from the lower part of the chain case 12 of the cultivator can be inserted into the input through hole 9a and fixed by 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. 26 shows a state in which the triangular tillage cylinder A is mounted on the traveling drive shaft 13 of the tiller. 27 shows a state in which the soil is being cultivated, the triangular cultivating cylinders A are connected in a plurality of axial directions, and the protruding amount of the cultivating blades 10, 10, ... Is appropriately changed to cultivate the soil. The cross-section in the state is flat-hole-shaped. Further, FIG. 28 is a P ₃ -P ₃ cross-sectional view along a line 27, which shows a state where the coupling by shifting the triangular plow cylinder A in the axial circumferential direction when connecting the two triangular plow cylinder A, A Is.

[0035]

[Effect of device]

 In the invention of claim 1, the small face portion 2 and the small face portion 2 on both sides 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 are a forward side small corner portion Cf and a backward side large corner portion Cb, respectively, and cultivating blades 10, 10, ... Are provided around the triangular cultivating cylinder A at predetermined intervals. By using the tiller for the tiller, firstly, it is possible to improve the safety of the worker at the initial movement of the tiller in the backward traveling, and secondly, to improve the tilling efficiency at the time of moving forward.

To describe the above effect in detail, the large reverse-side corner portion Cb formed by the large surface portion 1 adjacent on the backward rotation side is the small forward corner formed by the large surface portion 1 adjacent on the forward rotation side. By making it larger than the section Cf, when the cultivator is stopped or when the forward traveling state is changed to the back traveling, the large reverse corner Cb always bites into the soil before the small forward corner Cf. Become. Since the large reverse-side corner Cb is formed larger than the forward small-corner Cf, the forward small corner Cf bites into the soil and advances in comparison with the forward-moving small corner Cf. Even if the large reverse-side corner 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 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 of the triangular tiller A. It flows so as to go down the lower side, and the triangular tiller A is temporarily in the idling state in the initial movement of the back running, and therefore, it prevents the operator who operates the tiller from giving a large impact. Therefore, it is possible to reduce the risk of the operator's operation. Therefore, the safety of workers can be improved.

On the other hand, at the time of forward movement, the forward-side corner portion Cf is smaller than the backward-side large corner portion Cb, so that the angle formed between the forward-side small corner portion Cf and the average horizontal surface of the soil becomes large. Therefore, the horizontal component force F _{h at the} time of kicking the soil is also increased, and the forward small corner Cf can strongly move backward as if it strongly kicks the soil backward.

Next, the invention of claim 2 is the device according to claim 1, wherein the facet portion 2 is a cultivating device formed to bulge into a flat mountain shape along the rotation direction, whereby the facet portion 2 is moved backward. The angle θ _b of the reverse large corner Cb can be made relatively large as compared with the case where the straight large slope is provided from the side large corner Cb toward the forward small corner Cf. By increasing the angle θ _b of the large corner portion Cb, 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, the invention of claim 3 is the invention of claim 1, wherein the large reverse corner Cb is a cultivating device in which the large reverse corner Cb is an arcuate corner surface r bulging outward. The part Cb is approximated to a substantially horizontal shape, and by having a smooth surface, it is more difficult to bite into the soil as compared with the case where the large reverse-side corner part Cb has a corner shape, and when traveling backward, The resistance from the soil can be reduced as much as possible, and the slip state of the triangular tillage cylinder A can be increased to reduce the impact given to the operator who operates the steering wheel during the initial movement of back running.

Next, the invention of claim 4 is the device according to claim 1, wherein the triangular plowing cylinder A is provided with plowing blades 10, 10, ... At predetermined intervals, and the plowing blades 10, 10 ,. By the cultivating device in the cultivator characterized in that it can be appropriately projected and fixed along the direction, firstly, the cultivating blades 10, 10, ... Can be used for a long period of time. Secondly, there is an effect that the plowing depth can be finely adjusted.

To describe the above effect in detail, in the present invention, the plowing blades 10, 10, ... Are appropriately protruded from a predetermined position in the triangular plowing cylinder A, and the plowing blades 10, 10 ,. Since the structure is such that the plowing blades 10 can be fixed, even if the plowing blades 10 wear due to long-term use, only the amount of wear causes the plowing blades 10 to project outwardly. It can be used continuously in the same way by fixing it.

As a result, in the conventional type, the plowing blade is only slightly worn by the plowing work, and even if no other disadvantage is found in the plowing work, the plowing depth is equal to the worn amount. However, the cultivating blade 10 must be replaced with a new one, which is extremely uneconomical. However, in the present invention, the cultivating blade 10 is used for cultivating work. Even if it is worn out, the plowing depth can be sufficiently secured by projecting it outward from the triangular tillage tube A only by the worn amount, and the tilling blade 10 can be used without waste, and a new one can be used. It is economical because it can be exchanged for a longer period.

Further, in the present invention, when the plowing blade 10 is worn, not only is the plunging blade 10 projected outward from the triangular plowing cylinder A by the amount of wear to obtain the required plowing depth, but also the plowing blade 10 is Even if it is not worn, the plowing depth can be appropriately finely adjusted by projecting it to the outside of the triangular cultivating cylinder A for use. In the past, it was necessary to change the plowing blades of different sizes according to the desired plowing depth, but in the present invention, the plowing depth can be changed with only one type of plowing blade 10. It is possible.

[Brief description of drawings]

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

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

[Figure 3] Front view of a 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 a front view showing a state in which the plowing blade is most retracted from the triangular tillage cylinder and a state in which the plowing blade is most outwardly projected.

FIG. 16 is an enlarged view showing a state where the tilling blade is most retracted from the holder and a state where it is most outwardly projected.

FIG. 17 is a perspective view of an embodiment in which a mounting portion has a diamond-shaped through hole.

FIG. 18 (A) is a schematic view of a state in which a fastener is provided at the most retracted portion of the mounting portion. (B) is a schematic view of a state in which the fastener is provided at an intermediate portion of the mounting portion. Schematic diagram of the state where a fastener is provided on the outermost part of the mounting part

FIG. 19 is a perspective view of an embodiment in which a mounting portion has a circular through hole.

FIG. 20 is a schematic view when the mounting portion is a circular through hole with a play.

FIG. 21 is a perspective view of an embodiment in which the mounting portion has a long hole.

FIG. 22 is a schematic view when the mounting portion is a long hole with a play.

FIG. 23 is a perspective view of an embodiment in which a holder is provided with an auxiliary support part with one mounting part.

FIG. 24 is a front view of an embodiment in which the holder is provided with an auxiliary support part with one mounting part.

FIG. 25 (A) is a front view of a worn plowing blade. (B) is a sectional view taken along the line P ₂ -P ₂ in (A).

FIG. 26 is a schematic view of an embodiment in which a cultivator is provided with a triangular cultivating cylinder equipped with a cultivating blade.

FIG. 27 is a schematic view showing a state of plowing work.

28 is a cross-sectional view taken along the line P ₃ -P _{3 of} FIG.

FIG. 29 (A) is a schematic view showing an operating state of a conventional technique. (B) is a schematic view of a conventional type tiller.

[Explanation of symbols]

 A ... Triangular tiller 1 ... Large surface 2 ... Small surface Cf ... Small corner portion on forward side Cb ... Large corner portion on reverse side r ... Arced corner surface 10 ... Cultivating blade

Claims (4)

[Scope of utility model registration request] 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 cultivating device for a cultivator, which has large corners and is provided with cultivating blades around the triangular cultivating cylinder at predetermined intervals. 2. A corner portion between a small face portion of a triangular tillage tube in which three large face portions and three small face portions are alternately continuous and the large face portions on both sides of the small face portion are respectively formed on a forward side small corner portion and a backward side. Plowing in a cultivator characterized in that it is a large corner portion, cultivating blades are provided around the triangular cultivating cylinder at predetermined intervals, and the small face portion is formed to bulge into a flat mountain shape along the rotation direction. apparatus. 3. A small corner portion on the forward side and a reverse side on the rearward side, respectively, at the corner portions of the small face portion of the triangular tillage tube in which the three large face portions and the three small face portions are alternately continuous and the large face portions on both sides of the small face portion. A large corner portion is provided with plowing blades around the triangular tilling tube at a predetermined interval, and the rearward-side large corner portion is an arc-shaped corner surface that bulges outwardly. apparatus. 4. 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, wherein the large surface portion of the three surfaces and the small surface portion of the three surfaces are alternately continuous, are respectively formed on a forward side small corner portion and a reverse side side. A cultivating device for a cultivator, comprising a large corner portion, cultivating blades provided at predetermined intervals around the triangular cultivating cylinder, and the cultivating blades can be appropriately projected and fixed along the blade tip direction.