JP2010172262A - Land-leveling float structure of paddy field implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paddy field implement capable of preventing a mud-pushing action even by a land-leveling float having a width corresponding to the transplanting width of the whole rows, reducing the influence on already transplanted seedlings, and enabling the transplantation to be carried out well. <P>SOLUTION: The land-leveling float 11 having the width L corresponding to the transplanting width of the whole rows is installed, and a belt-shaped land-leveling part A exhibiting a belt shape along the width direction is formed over the whole length or nearly the whole length in the width direction on the bottom face of the land-leveling float 11. Mud-releasing recessed parts 27A recessed upward and for introducing the mud rearward are formed in the belt-shaped land-leveling part A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a leveling float structure of a paddy field machine provided with a leveling float having a lateral width corresponding to the entire strip.

  As a leveling float, a float main body portion (within the publication: the float front portion 13) having a width corresponding to the entire strip, and three rear overhang portions (within the publication: the float rear portion 12) extending rearward from the float body portion There is one that presents a float composed of: a bottom body portion that is hung from a rear end portion of a float main body portion to a rear overhang portion, and a series of plate materials are circulated (Patent Document 1).

Patent 2641636 (paragraph numbers [0010] [0011], FIG. 1 and FIG. 3)

  Therefore, since the plate-shaped bottom surface portion is grounded in a depressed state over a wide range from the float main body portion to the rear overhang portion, the mud is abutted against the plate-shaped bottom surface portion and the plate-shaped bottom surface portion. If the accumulated mud stays at the front end of the plate and flows to the lateral side along the front end of the plate-shaped bottom, the drained mud affects the adjacent strips (for example, pushes down the already planted seedlings). There was a fear.

  The object of the present invention is to provide a paddy field work machine that can suppress mud pushing even if it is a leveling float having a width corresponding to all the strips, suppresses the influence on adjacent strips, and is well planted. is there.

(Constitution)
The characteristic configuration of the invention according to claim 1 is provided with a leveling float having a lateral width corresponding to the entire strip, and presents a strip shape along the lateral width direction over the entire length in the lateral width direction or substantially the entire length of the bottom surface of the leveling float. A band-shaped leveling portion is formed, and a mud relief recess portion is formed in the band-shaped leveling portion so as to be recessed upward so as to guide mud behind. The operational effects thereof are as follows.

(Function)
In other words, since the strip body leveling part is provided in the float main body part that has the horizontal width over the whole strip, the side of each float part is compared to the one with a float structure that covers the whole strip with a plurality of float parts. It is possible to reduce the float passage trace formed by the end sinking in the field.
Moreover, since the field surface of all the strips is leveled by this strip-shaped leveling part, for example, seedlings can be planted on the leveled field surface, so that the planting strips are formed with good appearance.

In the section of the problem to be solved by the invention, when the bottom surface of the leveling float is formed in the same plane over the entire strip, mud pool is likely to occur at the front end of the bottom surface, and the accumulated mud is The point which may flow further laterally from the side end portion along the front end of the portion and affect the adjacent strips has been described.
On the other hand, in the present invention, since the mud escape recessed part that is recessed upward is formed in a part of the belt-shaped leveling part, the mud can be caused to flow behind the leveling float through the mud escape recessed part. It is possible to suppress the accumulation of mud at the front end of the belt-shaped leveling portion and the influence on adjacent strips.

(The invention's effect)
Since the strip-shaped leveling section is provided with a width across the entire strip, the leveling condition can be made constant over the entire strip compared to those with multiple floats, compared to those with multiple leveling floats, In addition to the effect that the float passage mark is difficult to be attached, the following specific effects can be obtained.
Providing a leveling float for paddy field work machines that can prevent mud from staying at the front end of the band leveling part and the effect on adjacent strips by improving the formation of a mud escape recess in a part of the band leveling part I was able to do it.

(Constitution)
The characteristic configuration of the invention according to claim 2 is that the leveling float has a float body portion having a lateral width over the entire strip, and is narrower than the lateral width of the float body portion, and is directed forward from the float body portion. And the mud relief recesses are formed on both sides of the front overhanging portion on the bottom surface of the float main body, and the effects thereof are as follows: It is.

(Function)
In other words, since a forward overhanging portion having a width narrower than that of the float main body portion is provided forward from the float main body portion having a horizontal width over the entire strip, the front overhanging portion is located on the field surface prior to the float main body portion. It is possible to sense a change in ground pressure due to the unevenness.
In addition, since the forward overhanging portion does not extend over the entire line, even when working at the shore, the degree of sensing the uneven portion at the shore is small, and the sensor function of the leveling float is stabilized.
On the other hand, by providing the front overhanging portion, mud that flows along the side edge of the front overhanging portion may stay at the front end portion of the float main body portion.
Therefore, in the present invention, a mud relief recessed portion that is recessed upward is formed on both sides of the front overhang portion on the bottom surface of the float main body portion so as to guide the mud behind. Accordingly, the mud flowing along the side edge portion of the front overhanging portion passes through the float main body portion from the mud escape recessed portion, so that the mud staying at the front end of the float main body portion is suppressed.

(The invention's effect)
Therefore, due to the provision of a forward overhanging portion that enhances the function of the leveling float as a ground contact sensor, by forming the above-mentioned mud escape recess in order to suppress the stay of mud at the front end of the float main body, For example, a leveling float structure that can suppress mud accumulation and hardly causes floating seedlings or the like during planting work is provided.

(Constitution)
The characteristic configuration of the invention according to claim 3 resides in that the bottom surface of the side end portion of the leveling float is formed as an inclined surface whose side end approaches the top surface of the float main body portion. It is as follows.

(Function and effect)
In other words, if the sinking of the side edge of the leveling float into the field surface is large, mud push occurs and the side of the leveling float is located on the side of the leveling float. An end trace may be formed on the field.
On the other hand, in the present invention, since the side end is formed on the inclined surface approaching the upper surface of the float main body part on the bottom surface of the side end part of the leveling float, it is formed on the side end part of the leveling float. The mud is leveled on the inclined surface and remains as a float passage trace.

(Constitution)
The characteristic configuration of the invention according to claim 4 is that the leveling float is supported so as to be swingable up and down around a rear fulcrum, and a rear fulcrum position of the leveling float is provided on the rear side of the belt-shaped leveling part. The operational effects are as follows.

(Function and effect)
That is, since the float main body part provided with the horizontal width over the whole strip is provided with the belt-shaped leveling part, the effect on the invention according to claim 1 is exhibited.
In addition to this, a rear fulcrum that supports the leveling float in a swingable manner is provided behind the belt-shaped leveling part, so that the rear fulcrum of the leveling float is the field surface after the uneven part is leveled by the belt-leveling part. The rear fulcrum is less rattling and the reference position of the leveling float that swings up and down due to the unevenness of the field surface is stable.
As a result, when this leveling float is incorporated into automatic control for keeping the tilling depth related to planting constant, and the leveling float is used as a grounding sensor, the backlash of the rear fulcrum is reduced. It is stable and the control itself is stable.
In addition, by arranging the rear fulcrum behind the belt leveling part, the position of the fulcrum related to the swing can be arranged sufficiently rearward, and the distance from the rear fulcrum to the front end of the leveling float can be increased. Even if the front end of the leveling float is lifted by the convex portion of the height, the swing angle can be reduced and the leveling float is less susceptible to disturbance.

(Constitution)
The characteristic configuration of the invention according to claim 5 is that a rear projecting portion is formed from the float main body portion, which is narrower than the lateral width of the float main body portion and protrudes rearward, and its operational effects. Is as follows.

(Function and effect)
In other words, from the float main body part, it is narrower than the width of the float main body part, and the rear projecting part protruding rearward is formed, so that the front and rear length of the float main body itself is not taken too long, Since the necessary longitudinal length can be secured for the entire leveling float, the entire leveling float is not so large, and a float structure that operates stably can be constructed.

(Constitution)
According to a sixth aspect of the present invention, the strip-shaped leveling portion is provided with the mud relief recessed portion and a leveling flat portion positioned below the mud relief recessed portion, and the mud relief recessed portion and the leveling flat portion. The boundary position is formed on a gently sloping surface along the lateral width direction, and the effects thereof are as follows.

(Function and effect)
When a mud escape recess is formed in the belt-shaped leveling portion, a step can be formed at a boundary portion between the mud escape recess and the leveling flat portion located below the mud escape recess. If it does so, the level | step-difference part will be formed as a float passage trace on a farm surface.
On the other hand, since a gently inclined surface is formed at the boundary part between the mud escaping recess and the leveling flat part, there is no stepped portion, and the formation of the float passage trace is from where the inclined surface is leveled. It is suppressed.

It is a whole side view showing a riding type rice transplanter. It is a whole top view showing a riding type rice transplanter. It is a side view which shows a leveling float. It is a top view which shows a leveling float. It is a rear view which shows a leveling float. It is a bottom view which shows a leveling float. It is the VII-VII sectional view taken on the line in FIG. It is the VIII-VIII sectional view taken on the line in FIG. It is the IX-IX sectional view taken on the line in FIG. FIG. 7 is a sectional view taken along line XX in FIG. 6. It is the XI-XI sectional view taken on the line in FIG. It is the XII-XII sectional view taken on the line in FIG. It is the XIII-XIII sectional view taken on the line in FIG. It is the XIV-XIV sectional view taken on the line in FIG.

A riding type rice transplanter as an example of a paddy field working machine will be described. As shown in FIGS. 1 and 2, the riding type rice transplanter is provided with an engine 4 or the like in the front part of a traveling machine body 3 equipped with front and rear wheels 1 and 2 as propulsion wheels, and behind the driving control part 5. A seedling planting device 7 is provided via a lifting link mechanism 6 and is configured as a four-row planting rice transplanter.
The seedling planting device 7 includes a seedling setting table 8, a planting transmission case 9 in a front-rear posture positioned below the seedling mounting table 8, and a seedling planting mechanism provided on the left and right of the rear end of the planting transmission case 9. 10. The planting transmission case 9 is equipped with a leveling float 11 that can swing up and down around the rear fulcrum.

The leveling float 11 will be described. As shown in FIGS. 3 to 6, the leveling float 11 has a horizontally long float main body 12 having a horizontal width L corresponding to the total planting width, and the left and right center positions of the float main body 12. And a pair of left and right rear overhang portions 14 extending rearward from two left and right directions of the float main body portion 12.
The front projecting portion 13 projects from the left and right center position of the front end of the float main body portion 12 toward the front, and has a function as a sensor float used for planting control.

  The front overhanging portion 13 and the rear overhanging portion 14 exhibit a lateral width of one third to one quarter of the lateral width of the float main body portion 12. The float main body 12, the front overhanging portion 13, and the rear overhanging portion 14 are integrally formed by blow molding in which two resin plates are stacked and placed in a mold, and compressed air is blown between the two resin plates. Yes. As the resin material used, engineering resins such as nylon, polyethylene, ABS, and PET are used.

  As shown in FIGS. 3 to 6, the front overhang portion 13 and the float main body portion 12 located behind the front overhang portion 13 are floated with respect to the rear end portion of the float main body portion 12 in a side view. The front end portion side of the main body 12 and the front overhanging portion 13 are formed to be slightly curved upward. The lateral portion 12A located on the lateral side of the front overhanging portion 13 in the float body portion 12 is also formed to be slightly curved upward toward the front end side with respect to the rear end portion.

  Since the leveling float 11 is blow-molded by superposing two resin plates, a flange part 11a that clearly indicates a parting line is formed at the middle position of the leveling float 11 as a shape after molding. The outer shell of the float bulges up and down with respect to the flange portion 11a.

  A description will be given of the belt-shaped leveling portion A that is a portion that comes into contact with the farm surface when the vehicle is traveling. That is, as shown in FIGS. 3 and 6, the front-rear width in the front-rear direction of the float main body 12 is shortened on the bottom surface of the rear end portion of the float main body 12 over the lateral width corresponding to the entire planting strip. A strip-shaped leveling portion A having a strip shape is formed. In FIG. 6, the belt-shaped leveling portion A clearly shows the region by a two-dot chain line. The strip leveling part A will be described later.

[Top structure of leveling float]
The shape of the upper surface of the leveling float 11 will be described. As shown in FIGS. 4, 5 and 9, in the front overhanging portion 13, the upper surface is formed on an inclined flat surface 13A which is located upwardly toward the front end side and is gently inclined, and extends laterally from the front end of the inclined flat surface 13A. A forward downward inclined surface 13 </ b> C that is inclined forward and downward toward the side is formed. As shown in FIGS. 4, 11, and 12, a mounting surface 13 </ b> B that is recessed downward is provided near the front end of the forward downward inclined surface 13 </ b> C. A front bracket 15 for hanging and supporting the leveling float 11 on the machine body frame side is attached to the mounting portion 13B.

  The mounting surface 13B formed in a state of being recessed downward is partly cut out of the inclined flat surface 13A and the front downward inclined surface 13C so as to open to the front space at the front end of the front overhanging portion 13. . Thus, since the mounting surface 13B is in a state of communicating with the front space, the muddy water on the farm surface can be guided onto the inclined flat surface 13A.

With such a configuration, muddy water can be introduced onto the inclined flat surface 13A, so that the muddy water is pushed away at the front end of the forward overhanging portion 13 and the pushed muddy water is prevented from pushing down adjacent planted seedlings. it can.
Further, since muddy water acts as a running resistance at the front end of the front overhanging portion 13, the vertical swing of the leveling float 11 is not stable due to the resistance, and the vertical fluctuation based on the ground pressure of the leveling float 11 is used. Then, the planting control for maintaining the planting height to be constant can reduce the muddy water resistance by the above-described notch, and can ensure the stability of the control.

As shown in FIG. 3, the left and right rear projecting portions 14 are formed with mounting seats 14 </ b> A in which mounting holes and the like are formed, and the rear bracket 20 that forms the rear fulcrum a of the leveling float 11 is fixedly mounted. It is configured.
Since the mounting seat 14A is provided near the rear end of the rear overhanging portion 14, the mounting seat 14A and the rear end of the rear overhanging portion 14 are in close proximity to each other. Therefore, even if the leveling float 11 rotates upward around the rear fulcrum a of the rear bracket 20, the depth at which the rear end of the rear overhanging portion 14 enters the farm surface is not so large, and the belt-shaped leveling surface A is applied. There is little disturbance to the ground leveling.

  As shown in FIGS. 4, 5, and 10, downward recessed installation portions 12 </ b> C are formed at four locations in the left-right direction at the rear end of the float main body 12. The recessed installation portion 12C is configured to mount a groove producing device (not shown) through an attachment hole when a fertilizer application device (not shown) is mounted on the rear part of the machine body.

  As shown in FIGS. 3 to 5, the front end of the lateral portion 12 </ b> A located on the left and right lateral sides of the left and right central portion where the forward projecting portion 13 of the float main body 12 projects is integrated from the upper surface of the lateral portion 12 </ b> A. In particular, a vertical wall 21 is erected.

  The vertical wall 21 is continuous from the root position, which is a connection site of the front overhang portion 13 to the float main body portion 12, toward the left and right lateral ends, and is slightly obliquely upward and forward from the upper surface of the lateral portion 12A. And projecting. The vertical wall 21 has a function of receiving mud that the rear wheel 2 positioned in front of the lateral part 12A jumps up and suppressing the mud from adhering and accumulating on the upper surface of the lateral part 12A.

The lateral end 12a of the lateral portion 12A of the float body 12 is formed in a direction perpendicular to the front end, and the end surface of the lateral end 12a is formed in a plane along the propulsion direction.
As described above, since the end surface of the lateral end 12a is formed in a plane along the propulsion direction, the muddy soil flowing along the end surface of the lateral end 12a is less likely to be swept laterally, and adjacent seedlings Inconvenience such as pushing down can be suppressed.

  In the above configuration, the end surface of the lateral side end 12a is configured as a surface along the propulsion direction. However, the end surface of the lateral side end 12a is closer to the left and right center side of the leveling float 11 toward the rear end side in the propulsion direction. You may comprise in the state inclined with respect to. Thereby, the function which suppresses that the already planted seedling to which mud soil adjoins flows into a crocodile can be improved.

[Bottom structure of leveling float]
As shown in FIGS. 6 and 11, a center-side mud intake recess 23 is formed across the bottom surface of the front overhang portion 13 and the bottom surface of the portion of the float main body portion 12 located behind the front overhang portion 13. It is. The center-side mud intake recess 23 is recessed upward from the front end position of the front overhanging portion 13 in a side view, and maintains a substantially constant recess depth along the curved state of the bottom surface. It is formed up to the vicinity of the rear end of the main body 12.

  The bottom view shape of the center side mud intake recess 23 is as follows. The center-side mud intake recess 23 is opened from the front end position of the front overhang portion 13, and the fan-like intake portion 23A that enters the rear side in a state where the width of the opening 23a is gradually narrowed, the front overhang portion 13 and the float body It has a minimum lateral width at a position corresponding to the connecting portion with the portion 12, and is composed of a narrow width portion 23B extending to the rear end portion of the float main body 12 while maintaining the minimum lateral width.

  In the case of the conventional configuration in which the central mud intake recess 23 is not provided, the mud soil blocked by the front end of the front overhanging portion 13 flows to the front end side of the lateral portion 12A of the float main body 12 and further adjoins. It could not be suppressed to reach the planting area. As a result, the mud that flowed in the adjacent planted seedlings sometimes fell down.

  On the other hand, in this invention, since the mud intake recessed part 23 was formed in the front overhang | projection part 13, it became possible to guide the mud soil from the front into the mud intake recessed part 23, and to make it flow back. It was. Therefore, it was not possible to flow more than necessary to the side portion 12A side, and it was possible to suppress the existing seedlings and the like from falling down.

Next, the side-side mud intake recess 24 that takes in the mud, which is formed on the bottom surface of the lateral portion 12A of the float main body 12 that smoothes the propulsion wheel traces, will be described.
As shown in FIGS. 6 and 8, the side-side intake recessed portion 24 opens from the front end of the lateral portion 12A of the float main body 12, and the ceiling surface 24b of the side-side intake recessed portion 24 in the side view is , Formed in a curved shape along the curved shape of the bottom surface of the float main body 12 (the first leveling flat portion 26A described later) and extending rearward, and the same at the rear end portion of the first leveling flat portion 26A The rear end side becomes gradually shallower so as to be at the height position, and is connected to the horizontal surface 26a of the third leveling portion 26C without a step. Thus, the rear end portion of the side-side intake recessed portion 24 is connected to the third leveling portion 26C without a step, and this rear end portion is referred to as a fourth inclined connecting surface 24D.

  The bottom view shape of the side-side mud intake recess 24 is as follows. As shown in FIG. 6, the side-side mud intake recess 24 is opened from the front end of the lateral portion 12A of the float body 12, and the fan-like shape enters the rear side in a state where the lateral width of the opening 24a is gradually reduced. It has a concave shape.

  With such a configuration, mud soil swelled on both lateral sides of the wheel marks formed by the front and rear wheels 1 and 2 is taken into the side mud take-in recessed portion 24 through the wide opening 24a, and the lateral width is gradually reduced. And it can push down by the ceiling surface 24b of the side side taking-in recessed part 24, and the taken-in mud can be brought near a wheel trace, and a wheel trace can be refilled.

  As shown in FIGS. 5, 6, and 10, between the center-side mud intake recess 23 and the side-side mud intake recess 24 located on both sides thereof, and laterally outward of the side-side mud intake recess 24. On the side, a mounting seat 25 used for mounting the groove forming device is formed together with a recess mounting portion 12C for mounting the groove forming device which is recessed toward the upper surface. Thus, since the mounting seat 25 is formed so as to be greatly recessed above the bottom surface, even if the mounting tool is inserted into the mounting seat 25, the leveling surface is rarely roughened.

Next, the part except the center side mud intake recess 23, the side mud intake recess 24, and the groove holder mounting seat 25 on the bottom surface will be described.
As shown in FIGS. 6-11, the bottom face part 26 is formed in the circumference | surroundings surrounding the center side mud taking-in recessed part 23, and the front bottom face part 26E of the bottom face parts 26 is located in the upper part at the front end side in a side view. It is formed in a curved shape. The rear bottom surface surrounding the narrow portion 24B of the center-side mud intake recess 23 is a portion that protrudes most downward on the bottom surface of the entire leveling float 11. Of the rear bottom surface portion, a portion surrounding the narrow portion 24B from the left and right sides is referred to as a second leveling flat portion 26B, and a portion positioned behind the narrow width portion 24B is referred to as a fourth leveling flat portion 26D.

  As shown in FIG. 6, a recessed portion 27 that is recessed above the second leveling flat portion 26B and the fourth leveling flat portion 26D on both lateral sides of the second leveling flat portion 26B and the fourth leveling flat portion 26D. Is formed. The recessed portion 27 is formed in a region from the second leveling flat portion 26B and the fourth leveling flat portion 26D to the vicinity of the side mud intake recessed portion 24, and the front-rear width thereof is substantially the front-rear width of the float body portion 12. It is formed in the width over.

  The recessed portion 27 is divided into two regions on the left and right, and the inclination of the bottom surface is different. That is, as shown in FIGS. 6 and 10, the recessed portion 27 is formed on both lateral sides of the second leveling flat portion 26 </ b> B and the fourth leveling flat portion 26 </ b> D surrounding the narrow width portion 24 </ b> B of the center-side mud intake recessed portion 23. The second recessed portion 27B adjacent to the first recessed portion 27A disposed adjacent to the second recessed portion 27B and close to the side mud intake recessed portion 24, as shown in FIGS. It is composed of.

  As shown in FIGS. 6 and 10, the second recessed portion 27 </ b> B is formed in a linear inclined surface 27 a that is inclined so as to be gradually positioned downward toward the front end side in a side view, and is centered at the front end position. It is connected to the front end bottom surface portion 26E surrounding the fan-shaped intake portion 23A of the side mud intake recessed portion 23.

On the other hand, as shown in FIGS. 6 and 9, the first recessed portion 27 </ b> A is formed on the curved surface 27 b located on the upper side of the front end in a side view, and a straight line is formed at the rear end of the float main body 12. It is formed on a flat surface 27c.
As shown in FIGS. 5, 10, and 11, both the first recessed portion 27 </ b> A and the second recessed portion 27 </ b> B are formed up to the rear end of the float main body 12, and near the rear end of the float main body 12, The height of the flange portion 11a is aligned.

  The first recessed portion 27 </ b> A described above is configured to take in the muddy soil flowing along the peripheral edge portion of the front overhang portion 13 and to flow backward. Here, the first recessed portion 27A is referred to as a mud relief recessed portion that is recessed upward to guide the mud behind, as described in claims 1 and 2.

  As shown in FIGS. 6-8, the 1st leveling flat part 26A and the 3rd leveling flat part 26C are formed in the circumference | surroundings of the side side mud taking in recessed part 24, and the 1st leveling flat part 26A is a side. It is located on both lateral sides of the side mud intake recess 24, and as described above, it is formed in a curved shape that is positioned upwardly toward the front end side along the curved shape of the bottom surface of the float main body 12 in a side view.

  As shown in FIGS. 6-8, the 3rd leveling flat part 26C is provided in the back side of the side mud taking-in recessed part 24, and is formed in the state where the horizontal part 26a continues in the back of the 1st leveling flat part 26A. The horizontal portion 26a is a portion located at the lowest position of the leveling float 11. On the rear side of the horizontal portion 26a, a rear rising inclined surface 26b is formed so as to be located closer to the rear end of the rear overhang portion 13. The horizontal portion 26a and the rearward rising inclined surface 26b form a third leveling flat portion 26C.

The rear end of the side-side mud intake recess 24 is connected to the front end of the horizontal portion 26a without a step, and the mud taken in the side-side mud intake recess 24 does not stay at the connection site and stays on the horizontal portion 26a side. To flow.
In addition, since the inclined surface 26b that is inclined upward toward the rear side is formed on the rear side of the horizontal portion 26a, mud retention on the inclined surface 26b is suppressed, and the leveling float 11 swings up and down around the rear fulcrum. Even if it moves, the inclined surface 26b portion does not sink deeply into the field surface, and mud pushing is also small.

Next, an inclined connecting surface formed between the center side mud intake recessed portion 23 and the side mud intake recessed portion 24 and the bottom surface portion 26 will be described.
As shown in FIGS. 6, 13, and 14, a second inclined connecting surface 23 </ b> C along the lateral width direction is formed at the boundary portion between the narrow width portion 23 </ b> B and the second leveling flat portion 26 </ b> B of the central mud intake recess 23. Has been. The second inclined connecting surface 23 </ b> C is formed on an inclined surface that is gentler than the escape gradient of the mold used when the leveling float 11 is blow-molded.

Since the second inclined connecting surface 23C is a gently inclined surface, the trace of the boundary surface between the narrow-side portion 23B of the center-side mud intake recess 23 and the second leveling flat portion 26B is difficult to adhere to the farm surface. It has become. For example, when the boundary surface between the narrow-side portion 23B of the center-side mud intake recess 23 and the second leveling flat portion 26B is formed at an angle close to a right angle, the narrow-width portion of the center-side mud intake recess 23 A large level difference is formed between 23B and the second leveling flat part 26B, and the level difference is formed on the field surface and remains as a level difference, which degrades the quality of planting work.
Accordingly, in the present invention, such a step trace is unlikely to remain.

A first inclined connecting surface 27C along the lateral width direction is formed on the boundary surface between the mud escape recessed portion 27A, the first leveling flat portion 26A, and the third leveling flat portion 26C. As shown in FIGS. 5 and 6, the first inclined connecting surface 27 </ b> C is formed on an inclined surface that is gentler than the escape gradient of the mold used when the leveling float 11 is blow-molded.
As a result, the traces of steps are unlikely to remain, and the unevenness of the planting surface is leveled, so that the planting posture of the seedling is not disturbed, the planting depth is stabilized, and the growth of the seedling is improved.

  Next, as shown in FIGS. 6 and 11, a third slope along the front-rear direction is formed at the boundary portion between the rear end portion of the narrow-width portion 23B of the center-side mud intake recess 23 and the fourth leveling flat portion 26D. A connecting surface 23D is formed. The third inclined connecting surface 23 </ b> D is formed on an inclined surface that is gentler than the escape angle of the mold used when the leveling float 11 is blow-molded.

  With such a configuration, it is possible to prevent the muddy soil that has reached the front end of the front overhanging portion 13 from being taken into the center side mud intake recessed portion 23 and flowing to the lateral side of the front overhanging portion 13. The muddy soil taken into the center-side taking-in recessed portion 23 can flow more smoothly from the third inclined connecting surface 23D toward the fourth leveling portion 26D. If the third inclined connecting surface 23D has a stepped shape with a large degree of inclination, there is a drawback that mud stays at the stepped portion, but the retention makes the inclination of the third inclined connecting surface 23D moderate. This is solved.

As shown in FIGS. 13 and 14, inclined surfaces 12 b are formed along the left-right direction on the bottom surfaces of the left and right end portions 12 a of the float main body 12. The inclined surface 12 b is formed in an inclined posture that is closer to the upper surface as it is closer to the lateral end of the float body 12.
In this way, by forming the upward inclined surface 12b on the bottom surface of the lateral end of the float main body 12 (leveling float 11), the sinking of the lateral end portion of the leveling float 11 into the field surface is suppressed, and It is possible to reduce mud extrusion to the side.

  As shown in FIG. 6 and FIG. 7, the curved first shape leveling that surrounds the side-side mud intake recess 24 at the lateral side end portion further than the formation position of the side-side mud intake recess 24 in the float main body 12. The flat portion 26A is formed in a continuous state. Behind the first leveling flat part 26A, the horizontal part 26a is formed in a continuous state, and forms a part of the third leveling flat part 26C.

[Zone-shaped leveling section]
A strip leveling portion A is formed at the rear end of the float main body 12. As shown in FIG. 6, the strip-shaped leveling portion A is a surface that exhibits a strip shape along the lateral width direction over the entire length or substantially the entire length of the bottom surface of the rear end portion of the float main body 12. The belt-shaped leveling portion A includes a fourth leveling flat portion 26D formed at the rear end portion of the central mud intake recess 23 and a rear end of the second concave insertion portion 27B formed on both lateral sides of the central mud intake recess 23. A flat surface 27c formed at the rear end portion of the first recessed portion 27A adjacent to the front-rear inclined surface 27a and the second recessed portion 27B formed along the width direction along the lateral width direction adjacent to the lateral side of the flat surface 27c. The first inclined connecting surface 27C that inclines and the third leveling flat portion 26C having a horizontal plane formed at the rear end of the side-side mud intake recessed portion 24 positioned further laterally than the recessed portion 27. . The third leveling flat portion 26 </ b> C is formed in a state from the side-side intake recess 24 to the lateral end of the float main body 12.

  As shown in FIG. 5 and FIG. 6, among those constituting the belt-shaped leveling portion A described above, the fourth leveling flat portion 26 </ b> D located behind the center-side mud intake recess 23 and the side-side mud intake recess 24. The third leveling flat portion 26C formed at the rear end is formed on the flat surface that protrudes downward. On the other hand, the inclined surface 27a and the flat surface 27c forming the recessed portion 27, which are sandwiched between the third leveling flat portion 26C and the fourth leveling flat portion 26D, are located slightly above and have the same height as the flange portion 11a. Is in position.

The third leveling flat portion 26C is located at the lowest position and forms a horizontal plane in the region including the front side overhang portion 13 and the portion of the float main body portion 12 located behind the front side overhang portion 13. Yes, it has a high leveling function.
4th leveling flat part 26D is located in the lowest part and forms a horizontal surface in the area | region containing the part located in the back of the front side overhang | projection part 13 in the back side overhang | projection part 14 and the float main body part 12. FIG. Yes, it has a high leveling function.

  The meaning of the presence of the recessed portion 27 formed between the central mud intake recess 23 and the lateral mud intake recess 24 is that the strip-shaped leveling portion A is on the same plane over the entire length of the planting width. However, in this case, mud pool and mud push are likely to occur in the belt leveling part A, and the function of improving the leveling function and avoiding mud push is satisfied. It doesn't let you.

  Therefore, the muddy soil flowing to the front end of the float main body 12 in which the recessed portion 27 is formed along the lateral side edge of the front overhanging portion 13 that protrudes forward is provided to the float main body 12. Rather than catching at the front end, by guiding backward through the recessed portion 27, mud pools are avoided, and the muddy soil is prevented from flowing out to the lateral side of the float main body 12.

As shown in FIGS. 3 to 6, the left and right rear projecting portions 14 are provided with mounting seats 14 </ b> A having mounting holes and the like so as to fix and fix the rear bracket 20 that forms the rear fulcrum a of the leveling float 11. It is formed. The mounting seat 14A is formed with a through hole 14a provided on the surface of the left and right overhanging portion 14 and a mounting hole 14b that is largely recessed upward on the bottom surface side.
The mounting hole 14b is formed in a shape that is largely recessed above the flat surface 27c of the mud relief recess 27B formed in the belt-shaped leveling portion A. Thus, only the function as a fulcrum is exhibited, and the mounting hole 14b does not disturb the ground leveling by the belt-shaped leveling part A.

  The belt-shaped leveling part A of the leveling float 11 is located in front of the seedling planting mechanism 10. Thereby, the leveling function with respect to the planting surface is sufficiently performed by the belt-shaped leveling part A, and there is no floating seedling or the like, and the posture of the planting seedling is maintained without falling down.

  The strip-shaped leveling part A is also formed in the rear part of the front overhanging part 13 located at the center of the planting width, and the marker marks applied to the farm surface in the previous step can be leveled.

[Another embodiment]
(1) Although the pair of left and right mud relief portions 27B are formed in the belt-shaped leveling portion A, the number, shape, width, etc. of the mud relief portions 27B can be arbitrarily provided.
Further, the position to be provided is not limited to the lateral side of the front overhanging portion 13.

(2) The mud intake recesses 23, 24 and the first to third inclined connecting surfaces 27C, 23C, 23D may not be particularly provided.

  The present invention can be applied to paddy field work machines such as walking type rice transplanters, direct seeding machines, and grass transplanting machines in addition to riding type rice transplanters.

DESCRIPTION OF SYMBOLS 11 Leveling float 12 Float main-body part 12a Side edge part 12b Inclined surface 13 Front overhanging part 14 Back overhanging part 26A 1st leveling flat part (leveling flat part)
26C 3rd leveling flat part (leveling flat part)
27A First recess (mud escape recess)
A Strip-shaped leveling part L Width

Claims (6)

  Providing a leveling float having a lateral width corresponding to the entire strip, forming a belt-like leveling part that exhibits a belt-like shape along the lateral width direction over the entire length or substantially the entire length of the bottom surface of the leveling float; Furthermore, the leveling float structure of the paddy field machine which has formed the mud escape recessed part which dents upwards in order to guide mud behind.   The leveling float is formed by a float main body portion having a lateral width over the entire strip, and a front overhanging portion that is narrower than the lateral width of the float main body portion and projects forward from the float main body portion, The leveling float structure of the paddy field machine according to claim 1, wherein a mud escape recessed portion is formed on both sides of the front overhanging portion at a bottom surface of the float main body portion.   The leveling float structure of the paddy field machine according to claim 1 or 2, wherein the bottom surface of the side end portion of the leveling float is formed as an inclined surface whose side end approaches the upper surface of the float main body portion.   The said leveling float is supported so that it can rock | fluctuate up and down around a back fulcrum, and the back fulcrum position of the said leveling float is provided in the back side from the said strip | belt leveling part. Leveling float structure of paddy field machine.   The leveling float structure of the paddy field machine according to claim 2, wherein a rear projecting portion that is narrower than a lateral width of the float main body portion and protrudes rearward is formed from the float main body portion.   The belt-shaped leveling portion is provided with the mud relief recess and a leveling flat portion positioned below the mud relief recess, and the boundary position between the mud relief recess and the leveling flat portion is gently adjusted along the lateral width direction. The leveling float structure of the paddy field machine as described in any one of Claims 1-5 currently formed in the various inclined surface.

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