Agricultural machine

Abstract

To provide an agricultural machine capable of suppressing mud splashing.SOLUTION: An agricultural machine includes a central tillage cover 20 for covering an upper part of the central tillage body 17, where the central tillage cover 20 has a drop part 82 for dropping mud, at a front end side. The drop part 82 has a first drop portion 86 and a second drop portion 87. The agricultural machine further includes an extended tillage cover 45 for covering an upper part of an extended tillage body 42, where the extended tillage cover 45 has a drop part 62 for dropping mud, at the front end side. The drop part 62 has a first drop portion 66 and a second drop portion 67.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an agricultural machine. [Background technology]

[0002] BACKGROUND ART Conventionally, an agricultural work machine such as that described in Patent Document 1 below is known.

[0003] This conventional agricultural work machine is connected to a running vehicle such as a tractor, and comprises a tilling body that performs tilling work, a leveling body that performs leveling work behind the tilling body, and a tilling cover that covers the top of the tilling body, and this tilling cover has a drop section at the front end for dropping mud (muddy water). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-172302 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional agricultural work machines, the falling part of the tillage cover is composed of only one plate-shaped falling part (hanging part), which tends to cause a lot of mud splashing due to the mud being guided and falling by that falling part (hanging part).

[0006] Therefore, one of the objects of the embodiments of the present invention is to provide an agricultural work machine that can suppress mud splashing. [Means for solving the problem]

[0007] An agricultural working machine according to an embodiment of the present invention comprises a tilling body that performs tilling work, a leveling body that performs leveling work behind the tilling body, and a tilling cover that covers the top of the tilling body, and the tilling cover has a drop section at its front end for dropping mud, and the drop section has a first drop portion and a second drop portion connected to the lower end of the first drop portion.

[0008] Further, an agricultural work machine according to an embodiment of the present invention comprises a working unit that is connected to a travelling vehicle and performs tillage and levelling work, and an extended working unit that is provided on the working unit and performs tillage and levelling work, the working unit comprising a tillage body that performs tillage work, a levelling body that performs ground levelling work behind the tillage body, and a tillage cover that covers the top of the tillage body, the tillage cover having a drop part at its front end for dropping mud, the drop part of the tillage cover having a first drop part and a second drop part connected to the lower end of the first drop part, the extended working unit performing tillage work The tilling machine comprises an extended tilling body for tilling soil, an extended soil leveling body for leveling soil behind the extended tilling body, and an extended tilling cover for covering the top of the extended tilling body, wherein the extended tilling cover has a drop section at its front end for dropping mud, and the drop section of the extended tilling cover has a first drop section and a second drop section connected to the lower end of the first drop section, and the angle formed by the second drop section of the drop section of the tilling cover and the horizontal plane in a side view is different from the angle formed by the second drop section of the drop section of the extended tilling cover and the horizontal plane in a side view. [Effects of the Invention]

[0009] According to the embodiment of the present invention, mud splashing can be suppressed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of an agricultural work machine according to one embodiment of the present invention (an agricultural work machine in an unfolded state with an extended working section in an unfolded working state). FIG. [Figure 2] FIG. 2 is a side view of the same agricultural work machine (in a folded state with the extended working section folded and in a non-working state). [Figure 3]FIG. 2 is a plan view of the same agricultural work machine (in an unfolded state with the extended work section in the unfolded working state). [Figure 4] FIG. 2 is a partial perspective view of the same agricultural work machine (in an unfolded state with the extended work section in the unfolded working state). [Figure 5] 4 is a schematic cross-sectional view of a portion AA in FIG. 3 (a partial schematic cross-sectional view of an extension working portion). [Figure 6] FIG. 4 is a schematic cross-sectional view of a portion BB in FIG. 3 (a partial schematic cross-sectional view of the central working portion). [Figure 7] This is an explanatory diagram (partial schematic cross-sectional view) of the operation during tillage work, where (a) is a diagram of a comparative example, (b) is a diagram of the extended working section of this embodiment (example), and (c) is a diagram of the central working section of this embodiment (example). [Figure 8] FIG. 2 is a plan view illustrating the operation of the agricultural implement during plowing. [Figure 9] FIG. 10 is a partial schematic cross-sectional view of an agricultural work machine according to another embodiment of the present invention (partial schematic cross-sectional view of an extension working section). [Figure 10] FIG. 10 is a partial schematic cross-sectional view of an agricultural work machine according to yet another embodiment of the present invention (partial schematic cross-sectional view of an extension working section). DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described with reference to FIGS.

[0012] In Figures 1 to 4 and 8, 1 is an agricultural work machine, and this agricultural work machine 1 is connected to the rear of a tractor 2, which is a vehicle that can travel on a field, for example, and is a plow machine that moves forward (in the direction of travel) on the field as the tractor 2 travels, performing a specified agricultural work, such as plowing or leveling the ground (plowing work).

[0013] As shown in Fig. 8, the tractor 2 has a tractor body 3, with left and right front wheels 4 provided at the front and left and right rear wheels (tires, crawlers, etc.) 5 provided at the rear. A three-point link (agricultural implement lifting device) (not shown) is provided at the rear end of the tractor body 3, and the agricultural implement 1 is detachably connected to this three-point link.

[0014] When working with the agricultural implement 1 connected to the three-point link at the rear of the tractor 2, the left and right rear wheels (traveling means) 5 are driven and rotated by the power of the engine mounted on the tractor body 3, and the tractor 2 travels on the field. As the rear wheels 5 pass by, a concave groove (a groove left by the travelling vehicle) 6 and convex mounds of soil 7 on both sides of it are formed in the field (see Figure 8).

[0015] The agricultural work machine 1 is, for example, a folding work machine with a foldable three-part structure, and is equipped with a central work unit 11 that is detachably connected to a three-point link section at the rear of the tractor 2 and is a work unit that performs at least tilling and leveling work (plowing work), left and right extension work units 12 that are provided at both left and right ends of the central work unit 11 and can rotate up and down around a rotation center axis (rotation fulcrum) 10 and perform at least tilling and leveling work (plowing work), and cylinders (electric hydraulic cylinders, hydraulic cylinders, etc.) 13 that are left and right rotation drive means that rotate the extension work units 12 up and down around the rotation center axis 10 relative to the central work unit 11.

[0016] Each of the left and right extension working units (left and right working units that are symmetrical to each other) 12 is placed in an unfolded working state by rotating in one direction (approximately 180 degrees in the opening direction) based on the extension and retraction action of the extendable cylinder 13, and is placed in a folded non-working state by rotating in the other direction (approximately 180 degrees in the closing direction).

[0017] Therefore, the agricultural work machine 1 can be selectively switched (set) between a state in which work (plowing or soil-pulling) is performed using only the central work unit 11, a state in which work is performed using the central work unit 11 and both the left and right extension work units 12, and a state in which work is performed using the central work unit 11 and either the left or right extension work unit 12.

[0018] The central working unit 11 comprises a central body 16, which is a machine that is detachably connected to the three-point link section at the rear of the tractor 2, a central tilling body 17, which is a tilling body that is rotatably mounted on the central body 16 and performs tilling work while rotating in a predetermined direction (down-cut direction), and a central leveling body 18, which is a leveling body that is rotatably mounted on the central body 16 in the vertical direction and performs leveling work behind the central tilling body 17.

[0019] The central machine body 16 has a central tillage cover (cover body) 20, which is a tillage cover that is approximately plate-shaped and convex upward and covers the upper part of the central tillage body 17, and the central tillage body 17 performs tilling work while rotating with its upper part covered by the central tillage cover (tilling cover part) 20.

[0020] The central body 16 has a three-point connection part 21 that is detachably connected (attached) to the three-point link part at the rear of the tractor 2, for example via a coupler, and this three-point connection part 21 is composed of a top mast 23 that holds a top pin 22 and left and right lower arms 25 that hold lower pins 24.

[0021] The central body 16 also has a transmission case section 27, which is a shaft holding section that rotatably holds an input shaft 26 that is connected to the PTO shaft of the tractor 2 via a joint, and the inner ends of frame pipe sections 28, which are frame sections that are longitudinal in the left-right direction, are attached to both the left and right sides of this transmission case section 27.

[0022] A chain case 29, which is a roughly box-shaped support part (one-side tillage unit support part), is attached to the outer end (left end) of the left-side frame pipe part 28. A bracket part (not shown), which is a roughly plate-shaped support part (the other-side tillage unit support part), is attached to the outer end (right end) of the right-side frame pipe part 28. The central tillage unit 17 is rotatably supported by the chain case 29 and bracket part, which are spaced apart and facing each other.

[0023] The central tilling body 17 has a tilling shaft 31, which is a rotating shaft elongated in the left-right direction and rotates in a predetermined direction based on power from the input shaft 26, and a plurality of tilling tines 32 are detachably attached to this tilling shaft 31. The upper part of the central tilling body 17 is covered by a central tilling cover 20 of the central machine body 16, and the detailed configuration of this central tilling cover 20 will be described later. Note that an engaging member (one-side clutch) 33 for power transmission is provided at both left-right ends (outer left and right ends) of the tilling shaft 31 of the central tilling body 17.

[0024] The central leveling body 18 has a first leveling member (leveling plate) 36 that is rotatable in the vertical direction at the rear end of the central tillage cover 20 of the central body 16, and a second leveling member (rake) 37 that is rotatable in the vertical direction is provided at the lower end of this first leveling member 36.

[0025] The extended working unit 12 comprises an extended body 41, which is a machine body that is rotatable in the vertical direction around a rotation center axis (rotation fulcrum) 10 at both left and right ends of the central body 16; an extended tilling body 42 that is rotatably mounted on the extended body 41 and that performs tilling work while rotating in a predetermined direction (down-cutting direction) together with the central tilling body 17 when the extended working unit 12 is in the extended working state; and an extended soil leveling body 43 that is rotatably mounted on the extended body 41 in the vertical direction and that performs soil leveling work together with the central soil leveling body 18 behind the extended tilling body when the extended working unit 12 is in the extended working state.

[0026] The extension body 41 has an extension tillage cover (cover body) 45, which is a tillage cover that is approximately plate-shaped and convex upward, and covers the upper part of the extension tillage body 42 when in the extended working state, and the extension tillage body 42 performs tillage work while rotating with the upper part covered by the extension tillage cover (tilling cover part) 45.

[0027] The extension tilling body 42 has a tilling shaft 46, which is a rotating shaft elongated in the left-right direction and rotates in a predetermined direction based on power from the central tilling body 17, and multiple tilling tines 47 are removably attached to this tilling shaft 46. The upper part of the extension tilling body 42 is covered by an extension tilling cover 45 of the extension body 41, and the detailed configuration of this extension tilling cover 45 will be described later. In addition, the inner end of the tilling shaft 46 of each of the left and right extension tilling bodies 42 is provided with an engagement member (other-side clutch) 48 for power transmission that releasably engages with the engagement member 33 of the central tilling body 17.

[0028] The extended ground leveling body 43 has a first ground leveling member (leveling plate) 51 that is rotatable in the vertical direction at the rear end of the extended tillage cover 45 of the extended body 41, and a second ground leveling member (rake) 52 that is rotatable in the vertical direction is provided at the lower end of this first ground leveling member 51.

[0029] An extension rake 53 is provided at the outer end of the second ground leveling member 52, and this extension rake 53 can be selectively switched by an extension rake switching section (opening / closing unit) 55 between an extended working state and a folded non-working state.

[0030] In Figure 3, 56 is a work state switching unit (earth-pulling unit) for selectively switching the ground leveling bodies 18, 43 between a ground leveling work state (ground leveling work state for plowing) and an earth-pulling work state, and by switching the ground leveling bodies 18, 43 to the earth-pulling work state by this work state switching unit 56, the agricultural work machine 1 enters an earth-pulling state in which earth-pulling work is possible. Also, 57 is a ground leveling body biasing unit (pressure unit) for biasing the ground leveling bodies 18, 43 downward.

[0031] The agricultural work machine 1 is also equipped with left and right track erasers 58 that are capable of guiding soil from mounded soil portions 7 of the field (mud in the field containing miscellaneous matter such as straw and grass) toward the concave groove portion 6, thereby erasing the tracks left by the rear wheels 5. Each of the left and right track erasers 58 has a plate-shaped outer soil-collecting body 59 that pushes soil from mounded soil portions 7 on the outer sides of the rear wheels 5 of the tractor 2 toward the groove portion 6, and a plate-shaped inner soil-collecting body 60 that pushes soil from mounded soil portions 7 on the inner sides of the rear wheels 5 of the tractor 2 toward the groove portion 6.

[0032] 5, the extension tillage cover 45 has a cover body plate portion 61 that covers the upper part of the extension tillage body 42, and a drop portion (front end of the cover for dropping mud) 62 that is provided at the front end of the cover body plate portion 61 and that guides and drops mud (muddy water) that moves (flows) forward along the cover body plate portion 61 based on the rotation of the extension tillage body 42 during tillage work. In other words, the extension tillage cover 45 has the drop portion 62 for dropping mud at its front end, and this drop portion 62 is arranged on the front side of the extension tillage body 42.

[0033] The cover main body plate portion 61 has a horizontal plate 63 that is positioned horizontally during tillage work, and an inclined plate 64 that is positioned in an inclined manner with a low front and high rear is connected to the front end of this horizontal plate 63.

[0034] The fall section 62 has a first fall section (first fall plate section) 66 which is connected to the front end of the inclined plate 64 and is a plate-like section elongated in the left-right direction and bent downward relative to the inclined plate 64, and a second fall section (second fall plate section) 67 which is connected integrally to the lower end of the first fall section 66 and is a plate-like section elongated in the left-right direction and bent forward relative to the first fall section 66, and the lower end of the second fall section 67 is a free end section 67a.

[0035] In addition, the drop portion 62 has a plate-shaped reinforcing portion 68 that is longitudinal in the left-right direction and fixed to both drop portions 66, 67 by welding or the like, and this reinforcing portion 68 is bent at multiple points, i.e., four points, and is composed of a bent plate 69 with sufficient strength.

[0036] Furthermore, an extended elastic plate (front rubber) 71 for preventing mud from scattering is detachably attached to the falling section 62 together with a pressing plate 72 by attachment means (for example, bolts and nuts) 70. That is, the extended elastic plate 71 is attached to the front surface of the second falling part 67 of the falling section 62 via the overlapping plate part 69a of the bent plate 69 so as to be positioned along this front surface. A free end 71a at the lower end of the extended elastic plate 71 is positioned lower than a free end 67a at the lower end of the second falling part 67.

[0037] Here, as shown in Fig. 5, the rear angle θ1 of the first falling portion 66 with the horizontal plane S in a side view during puddling work is 80° to 110°, preferably 90° to 110°. In the example shown in Fig. 5, the rear angle θ1 between the first falling portion (first falling surface) 66 and the horizontal plane S in a side view during puddling work is, for example, 90°. Therefore, this first falling portion 66 is positioned vertically along the vertical direction perpendicular to the horizontal plane S (the water surface of the field).

[0038] Furthermore, the rear angle θ2 of the second falling portion 67 with the horizontal plane S in a side view during plowing is 25° to 65°, preferably 45° to 65°. In the example shown in Fig. 5, the rear angle θ2 between the second falling portion (second falling surface) 67 and the horizontal plane S in a side view during plowing is an acute angle, for example, 65°. Therefore, this second falling portion 67 protrudes diagonally downward and forward from the lower end of the first falling portion 66, and is positioned in an inclined manner with a low front and a high rear.

[0039] Since the extended elastic plate 71 is disposed along the plate-shaped second falling portion 67, the rear angle α formed between the extended elastic plate 71 and the horizontal plane S is approximately the same as the angle θ2, although there is some flexibility due to the elastic material. Furthermore, the extended elastic plate 71 is not limited to rubber, and may be a resin plate or the like having elasticity.

[0040] 6, the central tillage cover 20 has a cover body plate portion 81 that covers the top of the central tillage body 17, and a drop portion (front end of cover for dropping mud) 82 that is provided at the front end of the cover body plate portion 81 and that guides and drops mud (muddy water) that moves (flows) forward along the cover body plate portion 81 based on the rotation of the central tillage body 17 during tillage work. In other words, the central tillage cover 20 has the drop portion 82 for dropping mud at its front end, and this drop portion 82 is positioned on the front side of the central tillage body 17.

[0041] The cover main body plate portion 81 has a horizontal plate 83 that is positioned horizontally during tillage work, and an inclined plate 84 that is positioned in an inclined manner with a low front and high rear is connected to the front end of this horizontal plate 83.

[0042] The fall section 82 has a first fall section (first fall plate section) 86 which is connected to the front end of the inclined plate 84 and is a plate-like section elongated in the left-right direction that is bent downward relative to the inclined plate 84, and a second fall section (second fall plate section) 87 which is connected integrally to the lower end of the first fall section 86 and is a plate-like section elongated in the left-right direction that is bent forward relative to the first fall section 86, and the lower end of the second fall section 87 is a free end section 87a.

[0043] In addition, the drop portion 82 has a plate-shaped reinforcing portion 88 that is elongated in the left-right direction and fixed to both drop portions 86, 87 by welding or the like, and this reinforcing portion 88 is bent at multiple points, i.e., four points, and is composed of a bent plate 89 that has sufficient strength.

[0044] Furthermore, a central elastic plate (front rubber) 91, which is an elastic plate for preventing mud from scattering, is detachably attached to the falling section 82 together with a pressing plate 92 by attachment means (for example, bolts and nuts) 90. That is, the central elastic plate 91 is attached to the front surface of the second falling portion 87 of the falling section 82 via an overlapping plate portion 89a of the bent plate 89 so as to be positioned along this front surface. A free end portion 91a at the lower end of the central elastic plate 91 is positioned lower than a free end portion 87a at the lower end of the second falling portion 87.

[0045] 4, reference numeral 93 denotes an elastic plate mounting hole, and the central elastic plate 91 can also be mounted to the central part of the central body 16 using this elastic plate mounting hole 93. In other words, since soil clogging is likely to occur near the central part of the central body 16 due to the location of, for example, a coupler, only the elastic plate mounting hole 93 is provided, and the central elastic plate 91 can also be mounted to the central part of the central body 16 as needed.

[0046] Here, as shown in Fig. 6, the rear angle θ3 of the first falling portion 86 with the horizontal plane S in a side view during puddling work is 80° to 110°, preferably 90° to 110°. In the example shown in Fig. 6, the rear angle θ3 between the first falling portion (first falling surface) 86 and the horizontal plane S in a side view during puddling work is, for example, 90° (θ1 = θ3). Therefore, this first falling portion 86 is positioned vertically along the vertical direction perpendicular to the horizontal plane S (the water surface of the field).

[0047] Furthermore, the rear angle θ4 of the second falling portion 87 with the horizontal plane S in a side view during plowing is 25° to 65°, preferably 25° to 45°. In the example shown in Fig. 6, the rear angle θ4 between the second falling portion (second falling surface) 87 and the horizontal plane S in a side view during plowing is an acute angle of, for example, 40° (θ2 > θ4). Therefore, this second falling portion 87 protrudes diagonally downward and forward from the lower end of the first falling portion 86, and is positioned in an inclined manner with a low front and a high rear.

[0048] Since the central elastic plate 91 is disposed along the plate-shaped second falling portion 87, the rear angle β formed between the central elastic plate 91 and the horizontal plane S is substantially the same as the angle θ4, although there is some flexibility due to the elastic material. Furthermore, the central elastic plate 91 is not limited to rubber, and may be a resin plate or the like having elasticity.

[0049] Furthermore, the distance (height) L1 between the free end 67a of the second falling portion 67 and the horizontal plane S is the same as (including approximately the same as) the distance (height) L2 between the free end 87a of the second falling portion 87 and the horizontal plane S. The short-side length (inclined length) of the second falling portion 67 is longer than the short-side length (inclined length) of the second falling portion 87, and the short-side length (vertical length) of the first falling portion 66 is shorter than the short-side length (vertical length) of the first falling portion 86.

[0050] Next, the operation of the agricultural work machine 1 will be described.

[0051] For example, as shown in Figure 3, when the agricultural work machine 1 is in a plowed state with the left and right extension working units 12 in an extended working state, and moves forward in a field (for example, a flooded rice field) by the tractor 2, the central working unit 11 and the left and right extension working units 12 perform plowed work (plowing and leveling work).

[0052] In other words, the central tilling body 17 and the left and right extension tilling bodies 42 rotate in a predetermined direction to perform tilling work, and behind them, the central leveling body 18 and the left and right extension leveling bodies 43 perform ground leveling work.

[0053] 7(a), that is, when the falling section 102 of the tilling cover 101 is composed of only one plate-shaped falling section 103, the mud scattered inside the tilling cover by the rotation of the tilling tines 105 of the tilling body 104 moves forward and is guided downward along the falling section 103, where it falls in a single line, concentrated at a falling position below the falling section 103. Therefore, the mud splashes diagonally upward and forward due to the concentrated falling mud, and the waves (ripples) generated on the water surface of the field are also large.

[0054] In contrast to this, in the case of this embodiment (example) shown in Figures 7(b) and (c), the mud falls in a dispersed manner in the front and rear, resulting in less mud splashing and smaller waves than in the comparative example.

[0055] Specifically, as shown in Figure 7(b), in the extended working unit 12, the drop section 62 of the extended tillage cover 45 is made up of a first drop section (θ1 = 90°) 66 and a second drop section (θ2 = 65°) 67, so that mud scattered inside the tillage cover by the rotation of the tillage tines 47 of the extended tillage body 42 moves forward and is guided downward along the drop sections 66, 67 of the drop section 62, whereupon the flow branches into two directions and falls separately at the front and rear drop positions corresponding to the two drop sections 66, 67. Therefore, compared to the comparative example, mud splashes are smaller and waves are also smaller.

[0056] In this case, the mud is dispersed into two parts: one guided by the first drop section 66 and falling to the rear drop position, and the other guided by the second drop section 67 and falling to the front drop position, and the waves caused by the front and rear falling mud interfere with each other, resulting in fairly small waves on the water surface in the field. Also, while mud splashing at the rear drop position is restricted (guarded) by the extended elastic plate 71, mud splashing at the front drop position is not restricted by the extended elastic plate 71 and is somewhat large.

[0057] 7(c), in the central working unit 11, the drop section 82 of the central tillage cover 20 is made up of a first drop section (θ3=90°) 86 and a second drop section (θ4=40°) 87, so that mud scattered inside the tillage cover by the rotation of the tillage tines 32 of the central tillage body 17 moves forward and is guided downward along the drop sections 86, 87 of the drop section 82, whereupon the flow branches into two directions and falls separately at the front and rear drop positions corresponding to the two drop sections 86, 87. Therefore, in this case too, mud splashing and waves are smaller than in the comparative example.

[0058] In this case, because angle θ4 is smaller than angle θ2, the amount of mud guided by second drop portion 87 is less than in the case shown in Figure 7(b), and the amount of mud guided by first drop portion 86 to fall to the rear drop position is greater than the amount of mud guided by second drop portion 87 to fall to the front drop position, so although the waves are slightly larger than in the case shown in Figure 7(b), the amount of mud splashing at the front drop position is significantly smaller. Also, mud splashing at the rear drop position is restricted by central elastic plate 91.

[0059] As a result of the above, as shown in Figure 8, somewhat large waves are generated in front of the central working unit 11 connected to the rear of the tractor 2, but these waves flow into the groove 6 in the trail and have no effect. Also, since mud splashes diagonally upwards and forward at the front fall position of the central working unit 11, mud adhesion to the tractor 2, coupler, central tillage cover 20, etc. is reduced.

[0060] On the other hand, since only small waves are generated in front of the left and right extension working units 12 compared to the central working unit 11, debris (straw, grass, etc.) floating on the water surface of the field is prevented from escaping outward, and even if mud splashes somewhat large diagonally upward and forward at the fall position on the front side of this extension working unit 12, there is no effect because the tractor 2 is not present in front of it.

[0061] Therefore, such an agricultural machine 1 can suppress mud splashes and waves (ripples) during tilling work in a field, thereby making it possible to suppress mud adhesion to the tractor 2, etc. (tractor dirt, etc.), and also to prevent debris floating on the water surface of the field from escaping to the outside, thereby improving maintainability and field leveling, etc.

[0062] Note that, in the agricultural work machine 1 according to the above embodiment, the angle θ1 formed between the first falling portion 66 and the horizontal plane S is 90° as shown in Fig. 5, but the present invention is not limited to this and may be any angle as long as it satisfies "80°≦θ1≦110°", and may be, for example, a configuration in which the angle θ1 is 110° as shown in Fig. 9. Note that if the angle θ1 exceeds 110°, mud will accumulate on the first falling portion 66, making it more likely to cause soil clogging, and if the angle θ1 is less than 80°, the effect of suppressing mud splashing will be insufficient (the same applies to the angle θ3).

[0063] Also, in the example shown in Figure 9, the angle θ2 between the second drop portion 67 and the horizontal plane S is 65°, the same as in Figure 5, but it is not limited to this and can be any angle as long as it satisfies "25°≦θ2≦65°", and if it is outside this range, the effect of suppressing mud splashing will be insufficient (the same applies to angle θ4).

[0064] Furthermore, the configuration is not limited to the one in which the extended elastic plate 71 is attached to the second falling portion 67 as shown in Figure 5, but may be, for example, as shown in Figure 10, a configuration in which the extended elastic plate 71 is attached to the front surface of the bending plate 69 together with a pressing plate 72 using an attachment means 70 so as to be positioned vertically.

[0065] Furthermore, the angle θ4 formed between the second drop portion 87 and the horizontal plane S is not limited to being smaller than the angle θ2 formed between the second drop portion 67 and the horizontal plane S, and may be, for example, a configuration in which the angle θ4 is larger than the angle θ2, or a configuration in which the angles θ2 and θ4 are the same. Similarly, the angle θ1 and the angle θ3 are not limited to being the same, and may be a configuration in which the angles are different.

[0066] On the other hand, the agricultural work machine is not limited to a folding work machine with a foldable three-part structure (a configuration having a central work section and left and right extended work sections), but may be a configuration having, for example, a work section connected to a running vehicle and an extended work section provided at only one of the left and right ends of this work section, or a non-foldable configuration (such as a single-arm harrow or rotary) that does not have an extended work section and only has a work section connected to a running vehicle as a work section capable of plowing work, or a configuration in which the angles of the first drop section and second drop section are different between the center of the machine body and both ends.

[0067] Furthermore, the leveling body (central leveling body, extended leveling body) that performs the leveling work is not limited to one having a first leveling member and a second leveling member, but may, for example, have only the first leveling member, or may be configured such that the leveling body is attached to the rear end of the tilling cover (central tilling cover, extended tilling cover) via an elastic plate such as a rubber plate. [Explanation of symbols]

[0068] 1 Agricultural machinery 2 Tractor as a traveling vehicle 11 Central working section 12 Extension work section 17 Central cultivating body, which is a cultivating body 18 Central Leveling Body, which is a leveling body 20 Central tillage cover, which is a tillage cover 42 Extended cultivating body (cultivating body) 43 Extended land leveling body (ground leveling body) 45 Extended tillage cover (tilage cover) 62,82 Drop section 66,86 1st falling part 67,87 2nd falling part 71 Extension Elastic Plate 91 The central elastic lamina, which is an elastic lamina S horizontal plane θ1 The angle between the first falling part of the falling part of the extension tillage cover and the horizontal plane θ2 The angle between the second falling part of the falling part of the extension tillage cover and the horizontal plane θ3 The angle between the first falling part of the falling part of the central tillage cover and the horizontal plane θ4 The angle between the second falling part of the falling part of the central tillage cover and the horizontal plane

Claims

1. A tilling body that does the tilling work, A leveling body that performs leveling work behind the tilling body; A tillage cover that covers the top of the tillage body, The tillage cover has a dropping portion at the front end side for dropping mud, The drop section has a first drop portion and a second drop portion connected to a lower end of the first drop portion. Agricultural machinery characterized by:

2. The second falling portion is bent forward relative to the first falling portion.

2. The agricultural implement according to claim 1.

3. The angle between the first drop portion and the horizontal plane in a side view is 80° to 110°.

3. The agricultural machine according to claim 1 or 2.

4. The angle between the second drop portion and the horizontal plane in a side view is 25° to 65°.

3. The agricultural machine according to claim 1 or 2.

5. a working unit that is connected to the traveling vehicle and performs tilling and leveling work; An extension working section is provided on the working section and performs tilling and leveling work, The working unit includes: A tilling body that does the tilling work, A leveling body that performs leveling work behind the tilling body; A tillage cover that covers the top of the tillage body, The tillage cover has a dropping portion at the front end side for dropping mud, The falling portion of the tillage cover has a first falling portion and a second falling portion connected to a lower end of the first falling portion, The extension working unit is An extension tilling body that performs tilling work, An extension leveling body that performs leveling work behind the extension tilling body; An extension tillage cover that covers the upper part of the extension tillage body, The extension tillage cover has a dropping portion at the front end side for dropping mud, The drop portion of the extension tillage cover has a first drop portion and a second drop portion connected to a lower end of the first drop portion, The angle formed by the second falling portion of the falling portion of the tillage cover and a horizontal plane in a side view is different from the angle formed by the second falling portion of the falling portion of the extended tillage cover and a horizontal plane in a side view. Agricultural machinery characterized by:

6. The angle formed by the second falling portion of the falling portion of the tillage cover and the horizontal plane in a side view is smaller than the angle formed by the second falling portion of the falling portion of the extended tillage cover and the horizontal plane in a side view.

6. The agricultural implement according to claim 5.

7. When viewed from the side, the angle between the second falling portion of the falling portion of the tillage cover and the horizontal plane is 25° to 45°, When viewed from the side, the angle between the second falling part of the falling part of the extension tillage cover and the horizontal plane is 45° to 65°.

6. The agricultural implement according to claim 5.

8. The working part is equipped with an elastic plate attached to the front end side of the tilling cover to prevent mud from scattering, The extension work section is equipped with an extension elastic plate attached to the front end side of the extension tillage cover to prevent mud from scattering.

8. The agricultural implement according to claim 5, wherein the first and second axes are parallel to each other.

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