JP2013192540A - Lime sower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lime sower, which has high spraying accuracy and facilitates sliding operation of a shutter plate.SOLUTION: A lime sower B is configured to perform fertilization by slidably disposing a shutter plate S outside a bottom plate V of a hopper K, and dropping and spraying a fertilizer easy to fly within the hopper K onto an agricultural field by rotating an agitator A disposed at the bottom of the hopper K. The shutter plate S and an overlap portion with the shutter plate S in the bottom plate V are bent respectively at a plurality of positions which are identical with each other in a cross sectional view, and a portion defined by each bending line L, L, L(L', L', L') is formed in a planar shape. Each spray hole H, H2 is formed in each planar portion on both sides of the specific bending line L(L') in the shutter plate S and the bottom plate V.

Description

  The present invention relates to a lime sower that applies fertilizer such as lime, which is easily scattered, by dropping and spreading in a streak form from a low position with respect to a field in a streak manner.

The thing of patent document 1 is known as conventional lime saw B '. As shown in FIGS. 4 and 7 which are drawings according to the present invention, and FIGS. 9 and 10 which are drawings according to the background art, the lime saw B ′ described in Patent Document 1 includes a horizontally long hopper K ′. An agitator A in which a large number of stirring blades 4a and 4b (see FIG. 1 according to the present invention) are attached to the rotating shaft 1 at a predetermined interval is disposed at the bottom, and the outside of the agitator A at the bottom of the hopper K ′. Includes a bottom plate V ′ having a plurality of bottom plate spraying holes H ₂ ′ spaced at regular intervals along the longitudinal direction, and is bent in an arc shape in a cross-sectional view, and is centered on the rotation center C of the agitator A. Are arranged along an arc surface, and on the outer side of the bottom plate V ′, a large number of the same pitch P as the pitch P of the bottom plate spray holes H ₂ ′ are bent in an arc shape in the same cross-sectional view. the shutter plates spraying holes H ₁ 'shutter plate S having a' Serial bottom plate V 'is slidably disposed longitudinally became state two-ply hand, the shutter plate S' by sliding amount of each spraying hole H ₁ of the shutter plate S 'and the bottom plate V'', H By adjusting the spraying area by adjusting the area of the synthetic spraying hole where ₂ 'is synthesized, the fertilizer that is likely to be scattered in the hopper K' by the rotation of the agitator A is streaked at a narrow interval with respect to the field. It is a configuration that applies fertilization by falling and spraying.

The shutter plate S ′ and the bottom plate V ′ of the conventional lime saw B ′ are both bent so that the cross section is arcuate, and the spray holes H ₁ ′, H ₂ ′ are on the bent plate. Is formed. The shutter plate S ′ and the bottom plate V ′ are formed by punching the spray holes H ₁ ′ and H ₂ ′ by press molding on a flat metal plate and then forming the spray holes H ₁ ′ and H ₂ ′. S ′ and V ′ are bent in an arc shape and attached to the lower opening of the hopper K ′. When stamping each spray hole H ₁ ′, H ₂ ′ and bending each plate S ′, V ′, factors such as material composition, thickness, etc., lubrication conditions, temperature, etc. Due to factors such as variations in processing conditions, it is difficult to make exactly the same shape of each molding hole after molding into a curved surface. Variations in the shape of the spray holes H ₁ ′ and H ₂ ′ result in non-uniform fertilizer fall and impair spraying accuracy.

In addition, when the above-described forming is not uniform, as shown in FIG. 11, uneven portions 61 that are uneven along the plate thickness direction are generated at the periphery of each spray hole H ₁ ′, H ₂ ′. In particular, the concavo-convex portion 61 generated at the edge along the width direction of each of the plates S ′ and V ′ becomes a resistance in the sliding of the shutter plate S ′, and the shutter plate S ′ when adjusting the spray amount. This hinders smooth sliding and reduces the operability for adjusting the spread rate.

Furthermore, the shutter plate S ′ and the bottom plate V ′ are both formed in an arc shape having the same center of curvature, and the support at both ends in the width direction of the shutter plate S ′ makes the sliding operation smooth. Therefore, there are many cases where there is some play along the circumferential direction, and in this case, the shutter plate S ′ slightly moves along the circumferential direction. As a result, the combined positions of the spray holes H ₁ ′ and H ₂ ′ of the respective plates S ′ and V ′ are slightly shifted, and the combined area varies. This phenomenon also causes uneven fertilizer application. 9 to 11, which are drawings according to the prior art, the same reference numerals are given to the same parts as those according to the present invention.

JP 2009-213420 A

  In the lime saw, the present invention increases the precision of spraying holes formed in the shutter plate and the bottom plate and increases the spraying amount of fertilizer as set, thereby improving the spraying accuracy and smoothing the sliding operation of the shutter plate. Thus, it is an object to facilitate the operation of adjusting the spread rate.

  According to the first aspect of the present invention, an agitator in which a large number of stirring blades are attached to a rotating shaft at predetermined intervals is disposed at the bottom of the horizontally long hopper, and a long side is disposed outside the agitator at the bottom of the hopper. A bottom plate having a number of bottom plate spray holes spaced at regular intervals along a direction is disposed along an arc surface centered on the rotation center of the agitator, and the pitch of the bottom plate spray holes is outside the bottom plate. A shutter plate having a plurality of shutter plate spreading holes having the same pitch as the shutter plate is arranged to be slidable in the longitudinal direction in a superposed state with respect to the bottom plate, and depending on the sliding amount of the shutter plate, each of the shutter plate and the bottom plate is arranged. By adjusting the spraying amount by adjusting the area of the composite spraying hole where the spraying holes are combined, the fertilizer that is likely to be scattered in the hopper is dropped onto the field by the rotation of the agitator. The lime saw is configured to be spread and fertilized, and the overlapping portion of the shutter plate and the shutter plate in the shutter plate and the shutter plate is bent at a plurality of positions that are the same in a cross-sectional view, and is divided by each folding line. The portion is formed in a planar shape, and each spray hole is formed in each planar portion on both sides of the specific folding line in the shutter plate and the bottom plate.

  According to the invention of claim 1, each spray hole of the shutter plate and the bottom plate is formed on each flat surface portion on both sides of the specific folding line in the shutter plate and the bottom plate. The molding after punching is performed only by bending, and each spray hole may be bent at the center in the width direction. For this reason, the bending which causes the dispersion | variation in the shape of each spraying hole becomes unnecessary, the precision of the shape of each spraying hole is raised, As a result, the spraying precision of a fertilizer is raised.

  In addition, each spray hole straddles the fold line and is formed in each flat part on both sides thereof, so that unevenness along the thickness direction is less likely to occur in the peripheral part of each spray hole, and the polymerization state Each of the sliding surfaces of the shutter plate and the bottom plate becomes a smooth flat portion without unevenness, and the plurality of flat portions in which the spray holes in the bottom plate are formed form protrusions protruding downward. At the same time, the protrusion is along the sliding direction of the shutter plate and acts as a slide guide for the shutter plate. As a result, when the shutter plate slides, the shutter plate does not shift in a direction different from the slide direction, the slide becomes smooth, and an operation for adjusting the fertilizer application amount becomes easy.

  According to a second aspect of the present invention, in the first aspect of the present invention, one of the plurality of fold lines of the shutter plate and the bottom plate is disposed directly below the rotation center of the agitator, The hole is characterized in that it has a symmetrical shape with respect to a fold line just below the rotation center.

  According to invention of Claim 2, since the center part of the width direction of each spraying hole is arrange | positioned in the lowest part of the width direction of a shutter board and a baseplate, the fall spraying of a fertilizer is performed most naturally.

  According to a third aspect of the present invention, in the second aspect of the present invention, the overlapping portion of the shutter plate and the shutter plate with the shutter plate in the invention is a flat portion divided by each fold line in a cross-sectional view and having the same width. In this way, each spray hole is formed in each of two adjacent flat portions in the center.

  According to the invention of claim 3, the shutter plate and the bottom plate have a total of four plane portions along the width direction, and each spray hole is formed in the two central plane portions. Therefore, in a state where there is no significant change in the distance between the bottom plate and the outer peripheral surface of the stirring blade of the agitator, that is, the shutter plate and the bottom plate are arranged in a substantially arc shape centering on the rotational axis of the agitator, Since it is divided into a total of four plane portions by three folding lines, the effect of the invention of claim 2 is more remarkably exhibited.

  In the lime saw according to the present invention, each spray hole provided in the bottom plate of the hopper and the shutter plate disposed in a superposed state on the outside of the bottom plate straddles the fold line, and the flat portions on both sides thereof. Therefore, unevenness along the plate thickness direction is less likely to occur at the peripheral edge of each spray hole, and the shutter plate and the slide surface of the bottom plate in a superposed state are smooth without unevenness. The plurality of flat portions in which the spray holes in the bottom plate are formed as a flat portion form a protruding portion protruding downward, and the protruding portion extends along the sliding direction of the shutter plate, and the shutter Since it acts as a slide guide for the plate, when the shutter plate slides, the shutter plate does not shift in a direction different from the slide direction, and the slide becomes smooth.

It is the perspective view which looked at the lime saw B which concerns on this invention from the side of the mast N connected with the tractor T. FIG. It is a perspective view of the lime saw B seen from the diagonally lower side of the mast N side. 2 is a perspective view of a state in which a shutter plate S is separated from a hopper K. FIG. 2 is a plan view of an agitator A. FIG. 3 is a partial perspective view showing a relationship between a bottom plate V and a shutter plate S constituting the lime saw B. FIG. It is a diagram for explaining that the area of each spraying holes H _1, H ₂ synthesis spraying holes are synthesized H ₀ of the shutter plate S and the bottom plate V is adjusted. 3 is an enlarged cross-sectional view of a portion of a bottom plate V and a shutter plate S. FIG. It is a side view of the fertilized state of the lime saw B with which the tractor T was mounted | worn. It is a fragmentary perspective view of shutter board S 'and bottom board V' which constitute conventional lime saw B '. It is an expanded sectional view of the bottom part of the conventional lime saw B '. 'Shutter plate S constitutes a' conventional Raimusowa B and 'each spraying hole H ₁ of the' bottom plate V, is a partial perspective view showing that irregularities occur along the thickness direction to the edge of the H ₂ '.

  A tractor-mounted lime saw B which is an embodiment of the present invention is shown in FIGS. FIG. 1 is a perspective view of the lime saw B according to the present invention as viewed from the side of the mast N connected to the tractor T, and FIG. 2 is a perspective view of the lime saw B as viewed from obliquely below the mast N side. 3 is a perspective view of a state in which the shutter plate S is separated from the hopper K, and FIG. 4 is a plan view of the agitator A. FIG. First, the overall structure of the lime saw B will be described, and then the portions of the bottom plate V and the shutter plate S according to the present invention will be described.

  1 to 4, the lime sower B has a substantially inverted isosceles triangle shape in which the hopper K for storing fertilizers such as lime that is easily scattered is horizontally long and the top is bent. The agitator A is arranged along the longitudinal direction Q at the bottom. A worm mission M is disposed in the center of the hopper K in the longitudinal direction, and the rotation of the PTO shaft (not shown) of the tractor T (see FIG. 8) is rotated by the universal joint 51 and the input shaft of the worm mission M. It is transmitted to the warm mission M through 52 and decelerated in the warm mission M. Output shafts 53 are provided on both sides of the worm mission M, the inner end side of each rotating shaft 1 of the agitator A is connected to the output shaft 53 of the worm mission M, and each outer end side is connected to each of the hoppers K. Each rotary shaft 1 of the agitator A is driven to rotate by being supported by bearings 3 of a shaft support plate 2 detachably mounted on the side surface in the short direction. Two types of stirring blades 4a and 4b having different shapes are attached to the two rotary shafts 1 at regular intervals along the axial direction. A large number of stirring blades 4b are attached in a horizontally reversed posture, and constitute two groups along the axial direction. In the hopper K, two types of stirring blades 4a and 4b having different shapes are used, and a large number of stirring blades 4b are mounted in a horizontally reversed posture so as to form two groups along the axial direction. This is because the fertilizer is uniformly accommodated along the longitudinal direction Q, and the fertilizer is uniformly distributed along the longitudinal direction Q. Further, as shown in FIG. 4, a large number of stirring blades 4 a (4 b) having the same shape that are continuous along the axial direction of the rotary shaft 1 are mixed with each other by the stirring rods 5 a and 5 b arranged in the axial direction. It is connected. The agitation rods 5a and 5b effectively agitate the fertilizer between the agitation blades 4a (4b) among the fertilizers stored in the bottom of the hopper K.

  The upper surface opening of the hopper K is covered with a lid 6, and a mast N for connecting the lime saw B to the tractor T and a shutter plate S to be described later are slid in the center of the side surface in the longitudinal direction of the hopper K. The link mechanism E is provided. A support pipe 7 is integrally attached to the central portion of the side surface in the longitudinal direction of the hopper K, and a pair of connecting plate portions 8 connected to the upper link 54 of the tractor T is provided in the central portion of the support pipe 7. The pair of first brackets 9 are integrally attached to the support pipe 7 with the pair of connecting plate portions 8 sandwiched therebetween and directed obliquely downward toward the hopper K side. A pair of second brackets 11 connected to each other via a connecting plate 10 are provided at the lower end portion so as to be substantially horizontal in a direction away from the hopper K and integrally therewith. A pair of hitch pins 12 connected to a pair of left and right lower links 55 of the tractor T along the longitudinal direction Q of the hopper K on the outer side surfaces of the front end portions (free end portions) of the pair of second brackets 11. Are provided integrally.

  The link mechanism E that slides the shutter plate S includes a lever unit 13 that is supported by one of the second brackets 11 so as to be rotatable about a horizontal axis, and a back surface of a central portion in the longitudinal direction of the shutter plate S. An L-shaped link 15 having one end connected to a connecting pin 14 provided integrally with the other, and a connection for connecting the other end of the L-shaped link 15 and one lever 13b of the lever unit 13. And rod 16. The fulcrum shaft 20 of the L-shaped link 15 is connected to the connecting plate 10. The lever unit 13 has a central portion of the rotation support shaft 13a supported horizontally by one second bracket 11, and levers 13b and 13c are integrally attached to both ends of the rotation support shaft 13a. The lever 13c is fixed to a lever fixing member 18 attached to the support pipe 7 via a bracket 17 at an arbitrary position within the set range to prevent the shutter plate S from being finely moved. An operating rod 19 for facilitating the operation of the link mechanism E is connected to the lever 13c constituting the lever unit 13 in a substantially vertical manner. In FIGS. 1 and 2, reference numeral 30 denotes a stand that is integrally attached to the outside of the pair of first brackets 9 to stand up and support the Liewa sower B when not in use with respect to a support (not shown). The support is shown.

Next, with reference to FIG. 5 thru | or FIG. 7, the part of the baseplate V and the shutter board | plate S which concerns on this invention is demonstrated. FIG. 5 is a partial perspective view showing the relationship between the bottom plate V and the shutter plate S constituting the lime saw B, and FIG. 6 is a composite in which the spray holes H ₁ and H ₂ of the shutter plate S and the bottom plate V are combined. FIG. 7 is a diagram for explaining that the area of the spray hole H ₀ is adjusted. FIG. 7 is an enlarged cross-sectional view of the bottom plate V and the shutter plate S. At the bottom of the hopper K, a bottom plate V is disposed on a substantially circular arc surface centering on the rotation center C of the agitator A and in proximity to the stirring blades 4a and 4b of the agitator A. Are arranged in a polymerized state. The shutter plate S is bent at the same obtuse angle slightly smaller than 180 ° by a total of three folding lines L ₀ , L ₁ , L ₂ so as to be divided into four equal parts along the width direction. All the four surfaces defined by the fold lines L ₀ , L ₁ , and L ₂ are flat portions. The bottom plate V corresponds to the folding shape of the shutter plate S, and the folding lines L ₀ ′, L ₁ ′, L ₂ corresponding to the folding lines L ₀ , L ₁ , L ₂ of the shutter plate S. In addition to being bent at ', the folding lines L ₃ and L ₄ corresponding to both ends in the width direction of the shutter plate S are also bent at an obtuse bending angle similar to the other parts. . Therefore, the same bent shutter plate S can be placed outside the bottom plate V bent as described above, and the shutter plate S slides against the bottom plate V in this superposed state. It becomes possible.

The shutter plate S is provided with a large number of shutter plate spreading holes H _{1 at} a constant pitch P along the longitudinal direction. In plan view, the shutter plate spreading hole H ₁ has two lengths in the long side portion of the rectangular first hole whose length in the width direction is longer than the length in the longitudinal direction and the slenderness ratio is approximately 2. This is a shape in which a second hole having a shape of an equilateral triangle and a shape in which the top portion protrudes greatly is synthesized. The bottom plate V is provided with a large number of bottom plate spray holes H _{2 at} a constant pitch P along the longitudinal direction. The bottom plate spraying hole H ₂ has a longer side length in the plan view than the length of the longitudinal side and a smaller slenderness ratio than the first hole constituting the shutter plate spraying hole H _1. It has a shape. As shown in FIG. 5, each of the shutter plate spreading hole H ₁ and the bottom plate spreading hole H ₂ has a central fold line L ₀ , (L ₀ ′) and fold lines L ₁ , L on both sides thereof. ₂ (L ₁ ′, L ₂ ′) formed on two continuous plane portions.

For this reason, the shutter plate S is formed from 180 ° so that the metal plate is formed with the folding lines L ₀ , L ₁ , L ₂ after punching the shutter plate spray hole H ₁ into the metal plate by pressing. Also, it can be formed by bending it into a slightly smaller obtuse angle. As a result, the shutter plate spreading hole H ₁ is formed in the two continuous flat portions formed by the bending lines L ₀ , L ₁ and L ₂ described above. In this embodiment, each edge along the longitudinal direction of the shutter plate S in the shutter plate spreading hole H ₁ is formed on each fold line L ₁ , L ₂ , and each fold line L ₀ , L ₂ is formed. _{The two} continuous plane portions formed by ₁ and L ₂ are utilized to the maximum to form the shutter plate spreading hole H ₁ . By this molding, it is possible to prevent the edge along the width direction in the shutter plate spreading hole H _{1 from} becoming uneven in the plate thickness direction, and the molding accuracy of the shutter plate spreading hole H ₁ is increased, and as a result, the fertilizer As the spraying accuracy is improved, the shutter plate S slides smoothly. The molding of the bottom plate V in which the bottom plate spray holes H ₂ are formed is exactly the same as the molding of the shutter plate S described above.

  As shown in FIGS. 2, 3, and 5, the lower end portions of the thin metal plates constituting the pair of opposing longitudinal side plates of the hopper K are bent outward at substantially right angles to form strip-shaped connecting pieces. 21 is formed, and both end portions in the width direction of the bottom plate V are bent outward at substantially right angles to form strip-like connecting pieces 22 in the same manner. Each connecting piece 21 of the hopper K and each connecting piece 22 of the bottom plate V are overlapped with each other, and the upper end surfaces of the plurality of connecting block bodies 23 arranged at predetermined intervals along the longitudinal direction Q of the hopper K. Placed in. On the other hand, both end portions in the width direction of the shutter plate S are bent outwardly at an obtuse angle, and each bent piece 24 is formed. The inner side surface of the connecting block body 23 has a shape corresponding to the bent shape of both end portions in the width direction of the bottom plate V and the shutter plate S, and the inner side surface of the connecting block body 23 is folded on the shutter plate S. An insertion groove 23a for inserting the bending piece 24 is formed along the longitudinal direction Q of the hopper K in the arrangement state. Then, each bent piece 24 of the shutter plate S is inserted into the insertion groove 23 a of each connection block body 23, and each connection piece 21, 22 of the hopper K and the bottom plate V superposed on each other is connected to the upper end surface of the connection block body 23. When the connecting pieces 21 and 22 and the connecting block body 23 are integrated with each other through the bolts 25 and the nuts 26, the positions of both the bottom plate V and the shutter plate S are arranged with respect to the hopper K. Confirmed and integrated.

As described above, when the bottom plate V is attached to the lower portion of the hopper K via the multiple connecting block bodies 23 and the shutter plate S is attached below the bottom plate V in a superposed state, the shutter plate S The center fold line L ₀ and the corresponding fold line L ₀ ′ of the bottom plate V are arranged immediately below the rotation center C of the agitator A, and the spray holes H ₁ , H _{2 of the} shutter plate S and the bottom plate V are arranged. Are symmetric with respect to the folding lines L ₀ and L ₀ ′, and the spray holes H ₁ and H ₂ are arranged at the lowest portions of the shutter plate S and the bottom plate V, respectively. A good spraying condition is achieved. Further, as described above, the shutter plate S is formed of four flat portions of equal width by being bent at an obtuse angle slightly smaller than 180 ° by the three folding lines L ₀ , L ₁ , and L _2. Since the bottom plate V is also bent to follow the shape of the shutter plate S, the shutter plate S and the bottom plate V can be arranged in a substantially arc shape with the rotation center C of the agitator A as a center. The fertilizer at the bottom of the hopper K stirred by the rotation of the stirring blades 4a and 4b and the stirring rods 5a and 5b is smoothly moved along the bottom plate V, and the synthetic spray hole H arranged at the lowest part. Falling down through ₀ .

A portion of the bottom plate V formed by the two flat portions where the bottom plate spray holes H ₂ are formed protrudes downward, and has a V-shaped protrusion 31 (opened with a large opening angle slightly smaller than 180 °). 5), and the protrusion 31 is along the sliding direction of the shutter plate S and acts as a slide guide for the shutter plate S. Therefore, when the shutter plate S slides, the shutter The board S does not shift in a direction different from the sliding direction, the sliding becomes smooth, and the manure application amount adjustment operation becomes easy.

As shown in FIG. 6, the fertilizer application amount is proportional to the area of the composite application hole H ₀ formed by overlapping the shutter plate application hole H ₁ of the shutter plate S and the bottom plate application hole H _{2 of} the bottom plate V. To do. Therefore, the adjustment of the spray amount, that is, the adjustment of the area of the composite spray hole H ₀ is performed by operating the link mechanism E by the operating rod 19 and moving the shutter plate S with respect to the bottom plate V in the longitudinal direction as in the conventional lime saw. By sliding it into As described above, the sliding operation of the shutter plate S can be performed smoothly.

As shown in FIG. 8, a lime saw B is attached to the rear part of the tractor T using a mast N provided at the front part of the hopper K, and the power of the PTO shaft of the tractor T is supplied to the agitator A via the worm mission M. By transmitting to each rotating shaft 1, the agitator A is driven and rotated. As a result, the fertilizer in the hopper K is agitated, and the fertilizer F passes along a direction perpendicular to the traveling direction R of the tractor T through a large number of synthetic spray holes H ₀ formed at regular intervals along the longitudinal direction. And fall into the field at narrow intervals. In addition, in FIG. 8, F shows the fertilizer before being discharged | emitted from the lime saw B and falling to a farm field.

In the shutter plate S of the above embodiment, the metal plate is bent at an obtuse angle slightly smaller than 180 ° by the three folding lines L ₀ , L ₁ , and L ₂ , and has four flat portions of equal width. The bottom plate V is an example in which the bottom plate V is bent following the shutter plate S. However, the number of fold lines of the shutter plate S and the bottom plate V, in other words, the number of plane portions, is the agitator A in the bent state. It is arbitrary on the condition that a gap capable of moving the fertilizer is formed between the outer peripheral edges of the stirring blades 4a and 4b.

  The lime saw B of the above embodiment is a tractor-mounted type, but the present invention can also be implemented for a traction type lime saw.

A: Agitator
B: Lime saw
C: Center of rotation of the agitator
H ₀ : synthetic spray hole
H ₁ : Shutter plate spray hole
H ₂ : Bottom plate spray hole
K: Hopper _{L 0, L 1, L 2} : fold line L ₀ of the shutter plate _{', L 1', L 2} ': folding of the bottom plate bend line
P: pitch of spray hole
S: Shutter plate
V: Bottom plate
1: Rotating shaft of agitator 4a, 4b: stirring blade 5a, 5b: stirring rod
31: Projection of bottom plate

Claims (3)

At the bottom of the horizontally long hopper, an agitator having a large number of stirring blades attached to a rotating shaft at a predetermined interval is disposed, and outside the agitator at the bottom of the hopper, a constant interval is provided along the longitudinal direction. A bottom plate having a large number of bottom plate spray holes is arranged along an arc surface centered on the rotation center of the agitator, and a large number of pitches are arranged on the outside of the bottom plate with the same pitch as the pitch of the bottom plate spray holes. A shutter plate having a shutter plate spraying hole is arranged to be slidable in the longitudinal direction in a superposed state with respect to the bottom plate,
The fertilizer that is easily scattered in the hopper by the rotation of the agitator by adjusting the spraying amount by adjusting the area of the composite spraying hole where the spraying holes of the shutter plate and the bottom plate are synthesized by the sliding amount of the shutter plate A lime saw that is applied to the farm by dropping and spraying on the field,
The overlapping portions of the shutter plate and the shutter plate in the shutter plate are folded at a plurality of positions that are the same in a cross-sectional view, and the portions defined by the folding lines are formed in a planar shape,
A lime saw, wherein each spray hole is formed in each flat portion on both sides of a specific folding line in the shutter plate and the bottom plate.   One of the plurality of fold lines of the shutter plate and the bottom plate is disposed immediately below the rotation center of the agitator, and each spray hole of the shutter plate and the bottom plate is arranged with respect to the fold line immediately below the rotation center. 2. The lime saw according to claim 1, wherein the lime saw is a symmetrical shape.   The overlapping portion of the shutter plate and the shutter plate in the bottom plate is divided into four so that a plane portion divided by each fold line in a cross-sectional view has an equal width, and each of two adjacent central portions The lime saw according to claim 2, wherein each spray hole is formed in the flat portion.

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