Agricultural working machine

Abstract

To provide an agricultural implement capable of carrying out proper tilling and land-leveling operations.SOLUTION: The central operation part 2 of the farm implement is equipped with a central land-leveling body 13 for performing land-leveling operation. The central land-grading body 13 has a first land-grading member 31 and a second land-grading member 32 rotatable around a rotation fulcrum P relative to the first land-grading member 31. The central operation part 2 of the farm implement is equipped with a regulating body 181 for regulating the rotation of the second ground-leveling member 32 to the first ground-leveling member 31. The regulation body 181 regulates the rotation of the second ground-leveling member 32 so that the center of gravity G of the second ground-leveling member 32 is not positioned in front of a vertical line L passing through the rotation fulcrum P in a side view.SELECTED DRAWING: Figure 6

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 has a tilling body that performs tilling work and a ground leveling body that performs ground leveling work behind the tilling body. The ground leveling body also has a first ground leveling member (leveling plate) and a second ground leveling member (rake) that is rotatable relative to the first ground leveling member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-335304 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when using the above-mentioned conventional agricultural work machine to perform tilling and leveling work, for example, on the edge of a field, the second leveling member may assume an inverted position (upright position) and remain in that inverted position, which may result in insufficient leveling and make it impossible to perform proper tilling and leveling work.

[0006] Therefore, one of the objects of the embodiments of the present invention is to provide an agricultural work machine that can perform appropriate tilling and leveling work. [Means for solving the problem]

[0007] An agricultural working machine according to an embodiment of the present invention comprises a tilling body for tilling work, a leveling body having a first leveling member and a second leveling member that can rotate relative to the first leveling member, and a regulating body that prevents the second leveling member from maintaining an inverted position by regulating the rotation of the second leveling member.

[0008] In addition, an agricultural working machine according to an embodiment of the present invention comprises a tilling body for tilling work, a leveling body having a first leveling member and a second leveling member that can rotate around a pivot point relative to the first leveling member, and a regulating body that regulates the rotation of the second leveling member, and the regulating body regulates the rotation of the second leveling member relative to the first leveling member so that the center of gravity of the second leveling member is not located forward of a vertical line passing through the pivot point when viewed from the side. [Effects of the Invention]

[0009] According to an embodiment of the present invention, proper tillage and preparation work can be performed. [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 (the agricultural work machine in a folded state with the extended working section folded and in a non-working state). FIG. [Figure 2] 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 3] FIG. 2 is a schematic partial cross-sectional view of the same agricultural work machine. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] 10 is a view showing a state in which the second ground leveling member of the agricultural work machine abuts against a regulating body. FIG. [Figure 7] 1A to 1C are explanatory diagrams of the agricultural implement (embodiment) during plowing work. [Figure 8] 10(a) to 10(c) are explanatory diagrams of the agricultural work machine (comparative example) during plowing work. [Figure 9] FIG. 10 is a view showing a state in which the rotation of a second ground leveling member of an agricultural work machine according to another embodiment of the present invention is restricted by a restricting body. DETAILED DESCRIPTION OF THE INVENTION

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

[0012] In Figures 1 and 2, 1 is an agricultural work machine, and this agricultural work machine 1 is a harrow that is connected to the rear of a tractor (not shown), which is a vehicle that can travel on a field, and can selectively perform predetermined tasks, such as plowing (plowing) and soil removal, while moving forward (in the direction of travel) on the field as the tractor travels.

[0013] 1 and 2, 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 2 that is detachably connected to a three-point link at the rear of the tractor and is a work unit that performs predetermined work (plowing and toppling), left and right extension work units (side work units) 3 that are provided at both left and right ends of the central work unit 2 so as to be rotatable up and down about rotation center shafts (rotation fulcrums) 5 and perform the predetermined work (plowing and toppling), and left and right rotation drive units 4 that rotate the extension work units 3 up and down about the rotation center shafts 5 relative to the central work unit 2. Each rotation drive unit 4 has, for example, a cylinder 7 that is an extendable drive means (actuator), and these cylinders 7 are, for example, electric hydraulic cylinders.

[0014] Each of the left and right extension working units (symmetrical left and right working units) 3 is placed in an unfolded working state by rotation in one direction (rotation of approximately 180 degrees in the unfolding direction) based on the extension operation of the cylinder 7, and is placed in a folded non-working state by rotation in the other direction (rotation of approximately 180 degrees in the folding direction) based on the contraction operation of the cylinder 7. In other words, each extension working unit 3 can be selectively switched between an unfolded working state and a folded non-working state by rotation based on the extension and contraction operation of the cylinder 7.

[0015] Therefore, the agricultural work machine 1 can be selectively switched (set) between a state in which a specified task is performed using only the central working unit 2, a state in which a specified task is performed using the central working unit 2 and both the left and right extension working units 3, and a state in which a specified task is performed using the central working unit 2 and either the left or right extension working unit 3.

[0016] The central working unit 2 comprises a central body 11, which is a machine that is detachably connected to the three-point link section at the rear of the tractor, a central tilling body 12 that is rotatably mounted on the central body 11 and performs tilling work while rotating in a predetermined direction (down-cutting direction), and a central leveling body 13 that is rotatably mounted on the central body 11 in the vertical direction and performs leveling work behind the central tilling body 12.

[0017] The central leveling body 13 can be selectively switched between a leveling work state (leveling free state) and an earthmoving work state (earthmoving locked state) by the switching unit 61 described later, and in the leveling work state it performs leveling work, but in the earthmoving work state it performs earthmoving work.

[0018] The central body 11 has a three-point linkage 15 that is detachably connected (attached) to a three-point linkage (agricultural work machine lifting support section) at the rear of the tractor.

[0019] The three-point connection part 15 can be connected to the three-point link part, for example, via a quick coupler (auto hitch) that is pre-attached to the three-point link part, and is composed of a top mast 17 having a top pin 16 that engages with the upper hook of the quick coupler, and left and right lower arms 19 having lower pins 18 that engage with the lower hooks of the quick coupler.

[0020] The central body 11 also has a transmission case portion 22, which is an input shaft holding portion that rotatably holds an input shaft 21 that is connected to the PTO shaft at the rear of the tractor via a joint, and the upper portion of the input shaft 21 is covered by an input shaft cover 23.

[0021] Furthermore, inner ends of frame pipes 24, which are cylindrical frames elongated in the left-right direction, are attached to the left and right sides of the transmission case 22. A chain case 25, which is a generally box-shaped support part, is attached to the outer end (left end) of the frame pipe 24 on the left side (frame part on one side) as viewed in the direction of travel. A bracket (not shown), which is a generally plate-shaped support part, is attached to the outer end (right end) of the frame pipe 24 on the right side (frame part on the other side) as viewed in the direction of travel.

[0022] The central tiller body 12 is rotatably supported by the chain case portion 25 and the bracket portion, which are the left and right support portions that are spaced apart and opposed to each other.

[0023] The central cultivator body 12 has a cultivator shaft 26, which is a longitudinal rotating shaft extending left and right and rotates in a predetermined direction based on power from the input shaft 21 side, and a plurality of cultivator tines 27 are removably attached to this cultivator shaft 26.

[0024] The upper part of the central tillage body 12 is covered by the tillage cover part 30 of the central machine body 11. A clutch member (one-side clutch) 28 for power transmission is attached to both left and right ends (outer left and right ends) of the tillage shaft 26 of the central tillage body 12.

[0025] The central leveling body 13 has a first leveling member (leveling plate) 31, which is approximately plate-shaped and is rotatable in the vertical direction at the rear end of the tillage cover section 30 of the central body 11, and a second leveling member (rake) 32, which is approximately plate-shaped and is rotatable in the vertical direction at the lower end of this first leveling member 31.

[0026] The extension working unit 3 comprises an extension body 41, which is a machine body mounted on both left and right ends of the central body 11 so as to be rotatable in the vertical direction around a rotation center axis 5; an extension tilling body 42, which is rotatably mounted on the extension body 41 and which performs tilling work by rotating in a predetermined direction (down-cutting direction) together with the central tilling body 12 when the extension working unit 3 is in the extended working state; and an extension leveling body 43, which is rotatably mounted on the extension body 41 so as to be rotatable in the vertical direction and which performs leveling work behind the extension tilling body 42 together with the central leveling body 13 when the extension working unit 3 is in the extended working state.

[0027] In addition, like the central leveling body 13, the extended leveling body 43 can be selectively switched between a leveling work state (leveling free state) and an earthmoving work state (earthmoving locked state) by the switching unit 61 described later, and in the leveling work state, leveling work is performed, and in the earthmoving work state, earthmoving work is performed.

[0028] The extension cultivator body 42 has a cultivator shaft 46, which is a longitudinal rotating shaft extending from left to right and rotates in a predetermined direction based on power from the central cultivator body 12 side, and a plurality of cultivator tines 47 are removably attached to this cultivator shaft 46.

[0029] When the extended working unit 3 is in the deployed working state, the upper part of the extended tilling body 42 is covered by the tilling cover part 50 of the extended machine body 41. The inner end of the tilling shaft 46 of each of the left and right extended tilling bodies 42 is provided with a power transmission clutch member (other-side clutch) 48 that can be disengaged with the clutch member 28 of the central tilling body 12.

[0030] The extended ground leveling body 43 has a first ground leveling member (leveling plate) 51, which is approximately plate-shaped and is rotatable in the vertical direction at the rear end of the tillage cover portion 50 of the extended body 41, and a second ground leveling member (rake) 52, which is approximately plate-shaped and is rotatable in the vertical direction at the lower end of this first ground leveling member 51.

[0031] An extension rake 53, which is a roughly plate-shaped extension leveling member, is rotatably provided on the outer end of the second leveling member 52. This extension rake 53 can be selectively switched between an extended working state and a folded non-working state by an extension rake switching unit 55. Reference numeral 56 in Figure 2 denotes a leveling body biasing unit that biases the leveling bodies 13, 43 downward during plowing work.

[0032] As shown in Figures 3 and 4, the agricultural work machine 1 is also equipped with a switching unit (earth-pulling unit) 61 for selectively switching at least the central leveling body 13 of the central working unit 2 (if the extended working unit 3 is in an extended working state, this is both the central leveling body 13 and the extended leveling body 43; the same applies below) to a leveling work state (a state in which it can be rotated vertically relative to the machine body) and an earth-pulling work state (a state in which it cannot be rotated vertically relative to the machine body).

[0033] First, the switching unit 61 has a driving means 63 for switching the state of the central leveling body 13 based on the operation of an operating unit (not shown) such as a remote control or smartphone by an operator sitting in the driver's seat of the tractor.

[0034] The drive means 63 is attached, for example, to an attachment position near the center in the left-right direction on the top surface of the tillage cover portion 30. The drive means 63 has a base member 66 attached to the attachment position of the tillage cover portion 30 and a unit-shaped drive unit 67 detachably attached to this base member 66.

[0035] The drive unit 67 consists of a motor unit having an electric motor (not shown) which is a drive source controlled by the control unit 60, and has a container-shaped storage case 81 which houses the electric motor, gears, etc., and from the left side portion 81a of this storage case 81 protrudes a drive shaft (output shaft) 82 which rotates based on the power from the electric motor.

[0036] The base member 66 has a base plate portion 86 attached to the attachment position of the till cover portion 30, a mounting plate portion 87 standing on the base plate portion 86, to which a storage case 81 of the drive unit 67 is detachably attached and which supports the drive unit 67, and a front rotation restriction shaft 88 and a rear rotation restriction shaft 89 which are multiple rotation restriction portions protruding from the mounting plate portion 87. Also, a drive shaft hole 91 is formed in the mounting plate portion 87, and the drive shaft 82 of the drive unit 67 is inserted into this drive shaft hole 91.

[0037] The switching section 61 also has a rotating body 93 that rotates in the front-rear direction integrally with the drive shaft 82 based on the power from the drive shaft 82 of the drive unit 67 .

[0038] The rotating body 93 has a generally fan-shaped rotating plate portion 94 and a cylindrical portion 95 that protrudes from the rotating plate portion 94 and into which the drive shaft 82 is detachably inserted and connected. The rotating plate portion 94 is also formed with an arc-shaped elongated hole portion 96 that is centered (including approximately the center) on the axis of the cylindrical portion 95.

[0039] The rotation of the rotating body 93 in one direction (forward) is restricted by a front rotation restriction shaft 88 of the base member 66 of the driving means 63, and the rotation of the rotating body 93 in the other direction (rear) is restricted by a rear rotation restriction shaft 89 of the base member 66 of the driving means 63.

[0040] Furthermore, the switching unit 61 has a holding body 101 having a round shaft-shaped insertion shaft 104 inserted into the long hole portion 96 of the rotating body 93, and a long, elongated body 102 slidably held by this holding body 101.

[0041] The holder 101 has an insertion hole 106 formed so as to penetrate the holder 101, and the elongated body 102 is slidably inserted into this insertion hole 106.

[0042] The elongated body 102 has a straight, thin, round shaft-like portion 111, and a retaining nut 113 is attached to a threaded groove on the outer peripheral surface of one end of the shaft-like portion 111 together with a washer 114 by screwing it into the threaded groove. A connecting plate portion 116 is connected to the other end of the shaft-like portion 111, and a pin hole 117 is formed in the connecting plate portion 116. Furthermore, a protruding, annular spring abutment portion 118 is fixed to the outer peripheral surface of the shaft-like portion 111 near the other end.

[0043] A coil spring 120, which is an elastically deformable first elastic member that biases the elongated body 102, is disposed on the outer circumferential side of the shaft-shaped portion 111 of the elongated body 102. One end of the coil spring 120 abuts against the holding body 101 via a washer 115, and the other end abuts against a spring abutment portion 118 of the elongated body 102.

[0044] The switching unit 61 also has a leveling body support means 122 having an engagement shaft 121 which is a round shaft-shaped engagement portion, a rotatable plate-shaped engagement body (earth-pulling cam) 123 which maintains (holds) and locks the central leveling body 13 in an earth-pulling operation state by engaging with the engagement shaft 121, and a connecting body 124 which connects this engagement body 123 to the long body 102.

[0045] Furthermore, the switching section 61 has a regulating body (cam regulating body) 125 that regulates the rotation of the engaging body 123, and a torsion spring 130 that is a second elastic member that is elastically deformable and that biases the engaging body 123, and is installed between the engaging body 123 and the regulating body 125.

[0046] The ground leveling body support means 122 has a first support arm (first support member) 131 whose front end is rotatably attached via a shaft (pin) 126 to the rear end of the mast mounting portion 20 to which the top mast 17 is attached, and a second support arm (second support member) 132 whose upper end is rotatably attached via a shaft (pin) 127 to the rear end of the first support arm 131. The lower end of this second support arm 132 is rotatably attached via a shaft (pin) 128 to the second ground leveling member 32 of the central ground leveling body 13.

[0047] The leveling body support means 122 also has an engagement arm 133, which is an engagement member that can be detachably engaged with the engagement body 123. The rear end (lower end) of the engagement arm 133 is rotatably attached to an attachment portion 134 of the first support arm 131 via a shaft (pin) 129. The shaft (pin) 129 is inserted into holes 131a, 133a of both arms 131, 133 and is prevented from coming off by an R pin 135.

[0048] The engagement arm 133 has a left-right engagement shaft (pin) 121 at the front end (upper end) which is the free end, and this engagement shaft 121 engages with the engagement body 123 when the central leveling body 13 is in the earthmoving operation state.

[0049] The engaging arm 133 has left and right opposing plate portions 136 that are spaced apart and opposed to each other, and the upper ends of these opposing plate portions 136 are connected to each other by a connecting plate portion 137 that is an upper plate portion, and an opening portion 138 that is longitudinal in the front-rear direction is formed in this connecting plate portion 137. A protruding inlet / outlet portion (protrusion) 139 of the engaging body 123 can enter and exit the approximately U-shaped frame-shaped engaging arm 133 through this opening portion 138.

[0050] The engagement body (earthwork cam) 123 is made of a single plate-like member formed in a predetermined shape, and is provided on the mast mounting part 20 of the central body 11 so as to be rotatable about a shaft 140 in the left-right direction.

[0051] That is, for example, the engaging body 123 is rotatably attached to the mast mounting portion 20 using a bolt 141, a nut 142, and a collar 143, and the shaft portion of the bolt 141 forms a shaft 140 which is the center of rotation of the engaging body 123.

[0052] Furthermore, the engaging body 123 has an engaging recess 145 that can be engaged with and disengaged from the engaging shaft 121 of the engaging arm 133, and this concave engaging recess 145 that opens upward is formed with a bulging portion 146 and a recessed portion 147. The bulging portion 146 is formed on an upper portion of one side of the engaging recess 145, and the recessed portion 147 is formed on a lower portion of the other side of the engaging recess 145.

[0053] Furthermore, the engaging body 123 has a first abutment surface 153 that abuts against the regulating body 125 when it is subjected to the biasing force of the torsion spring 130 in one direction, and a second abutment surface 154 that abuts against the regulating body 125 when it is subjected to the biasing force of the torsion spring 130 in the other direction.

[0054] The torsion spring 130 exceeds the fulcrum when the engaging body 123 rotates around the axis 140, and one end of the torsion spring 130 is attached to the mounting hole 155 of the engaging body 123, and the other end of the torsion spring 130 is attached to the mounting hole 156 of the regulating body 125.

[0055] The connecting body 124 has a round shaft-like portion 161 that is bent at one point in the middle, and one end side of this shaft-like portion 161 is fitted and fixed into the connecting hole 157 of the engaging body 123. A plate-like connecting plate portion 162 is connected to the other end of the shaft-like portion 161, and this connecting plate portion 162 has a pin hole 163 formed in it.

[0056] The connecting pin 165 is inserted into the pin hole 163 of the connecting plate portion 162 of the connecting body 124 and the pin hole 117 of the connecting plate portion 116 of the elongated body 102, thereby rotatably connecting the two connecting plate portions 116, 162 to each other via the connecting pin 165. The connecting pin 165 inserted into the two pin holes 117, 163 is prevented from coming out by the R pin 164. In this way, the engaging body 123 and the elongated body 102 are connected to each other by the connecting body 124, and the engaging body 123 rotates about the shaft 140 as the elongated body 102 moves.

[0057] In addition, the switching section 61 has a cover body 171 that can rotate in the vertical direction (can move up and down) and covers the rear end side of the top mast 17 and the front end side of the engagement arm 133, as well as the upper end side of the engagement body 123, i.e., for example, the entrance / exit section 139 of the engagement body 123 that protrudes upward from within the engagement arm 133 through the opening 138.

[0058] The cover body (cam cover) 171 is provided, for example, at the rear end of the top mast 17 so as to be rotatable in the vertical direction around a left-right shaft 172. The cover body 171 is also detachable from the top mast 17 based on elastic deformation.

[0059] During tillage work in the field (when the leveling body is in the leveling work state), the cover body 171 is always in contact (sliding contact) with the engaging arm 133 based on the up and down rotation of the central leveling body 13 in the leveling work state, and rotates up and down around the shaft portion 172 in conjunction with the movement of the engaging arm 133.

[0060] As mentioned above, the switching unit 61 is composed of, for example, the drive means 63, the rotating body 93, the holding body 101, the elongated body 102, the coil spring 120, the leveling body support means 122, the engaging body 123, the connecting body 124, the regulating body 125, the torsion spring 130, and the cover body 171. The state shown by the solid line in Fig. 3 is the earthwork operation state, and the state shown by the two-dot chain line in Fig. 3 is the leveling operation state.

[0061] Furthermore, as shown in Figures 5 and 6, the agricultural work machine 1 is equipped with a protruding inverted position maintenance prevention regulating body (protrusion) 181 that prevents the central second leveling member 32 from maintaining an inverted position (upright position) by regulating the rotation of the second leveling member 32 (rotation around the rotation fulcrum P of the second leveling member 32 relative to the first leveling member 31) by abutting against the second leveling member 32 of the central leveling body 13 of the central working unit 2.

[0062] Furthermore, when the extension working unit 3 is in the extended working state, the inner end of the second leveling member (extension side rake) 52 of the extension working unit 3 in this extended working state and the outer end of the second leveling member (central side rake) 32 of the central working unit 2 are removably fitted and connected to each other, so that the second leveling member 52 on the extended side is similarly prevented from being maintained in an inverted position by the regulating body 181, which is a protruding protrusion.

[0063] As shown in Figure 6, this regulating body (inverted maintenance prevention means) 181 regulates the forward rotation of the second ground leveling member 32 around the pivot point P relative to the first ground leveling member 31 so that, in a side view, the center of gravity G of the second ground leveling member 32 is not positioned above the pivot point (rotation center of the second ground leveling member 32) P and beyond the vertical line (vertical plane) L passing through the pivot point P, and is not positioned forward of the vertical line L.

[0064] In other words, the abutment (contact) between this regulating body 181 and the second leveling member 32 restricts the forward rotation of the second leveling member 32, so that when viewed from the side, the center of gravity G of the second leveling member 32 is always located behind the vertical line L passing through the rotation fulcrum P. Therefore, even if the second leveling member 32 becomes inverted during plowing and leveling work (harrowing work) at the edge of a field, for example, the position of the center of gravity G will not allow it to maintain its inverted position.

[0065] Here, the regulating body 181 is protrudingly provided at a position near the lower end of the second support arm 132, which is a longitudinal connecting body (connecting arm) rotatably connected to the second ground leveling member 32 via an axis (pin) 128, for example.

[0066] The second support arm 132 is made of, for example, a longitudinal member having a roughly U-shaped cross section, and its lower end is rotatably attached via a left-right axis (pin) 128 to a roughly U-shaped frame-shaped mounting part 182 located in the left-right center of the second ground leveling member 32. The mounting part 182 has left and right opposing plates 183 that are spaced apart and face each other, and these opposing plates 183 are connected together by a connecting plate 184 that serves as a connecting part.

[0067] Furthermore, the mounting portion 182 of the second ground leveling member (rake) 32 is rotatably mounted to a rake mounting portion 186 located in the left-right center of the first ground leveling member 31 via an assembly shaft (rotation shaft) 187. The left-right axis passing through the shaft center of the assembly shaft 187 serves as a rotation fulcrum (rotation center axis) P.

[0068] On the other hand, the regulating body 181 is made up of, for example, a metal pin member (headed pin) 191, and a rubber member 192, which is a substantially cylindrical, elastically deformable elastic member made of rubber and fixed (fixed) to a pin portion 190 of the pin member 191 with an adhesive or the like. The rubber hardness of the rubber member 192 is, for example, 60 to 80 degrees in type A durometer hardness defined in JIS K6253.

[0069] The pin member 191 is inserted into a pin hole 199 formed in a plate portion 198 of the second support arm 132 and is fixed to the plate portion 198 by welding.

[0070] The rubber member 192 has a pin fitting hole 193 shaped to correspond to the pin portion 190 of the pin member 191, and the pin portion 190 of the pin member 191 is inserted into the pin fitting hole 193 to be fitted and fixed.

[0071] In addition, the tip portion of the rubber member 192 that covers the tip surface of the pin portion 190 of the pin member 191 serves as an abutment portion (elastic abutment portion) 194 that abuts in a planar manner against a contact receiving portion 195, which is part of the upper surface of the second leveling member 32.

[0072] Furthermore, for example, due to long-term use or deterioration over time, the abutment portion 194 at the tip of the rubber member 192 may become thin due to wear, or the rubber member 192 may come off the pin portion 190. Therefore, even in such cases, it is preferable to set the protruding length dimension (axial length dimension) of the pin portion 190 of the pin member 191, which is the length by which the pin portion 190 protrudes from the plate portion 198 of the second support arm 132, to a predetermined dimension or more so that the regulating body 181 can regulate the rotation of the second ground leveling member 32 and prevent the second ground leveling member 32 from maintaining an inverted posture. In other words, it is preferable to set the protruding length dimension of the pin portion 190 to a dimension such that, even without the rubber member 192, the center of gravity G of the second ground leveling member 32 will not be located forward of the vertical line L passing through the rotation fulcrum P in a side view when the pin portion 190 abuts against the abutment receiving portion 195 of the second ground leveling member 32.

[0073] Next, the operation of the agricultural work machine 1 will be described.

[0074] For example, as shown in Figure 2, when the agricultural work machine 1 with the left and right extension working units 3 deployed moves forward in the field as the tractor travels, the tilling units 12, 42 perform tilling work, and behind them, the land leveling units 13, 43 in the land leveling work state perform land leveling work. In this way, the central working unit 2 and the left and right extension working units 3 perform plow work (land leveling work).

[0075] Here, the agricultural work machine (embodiment) 1 may be used to perform, for example, plow work on the edge of a ridge in a farm field.

[0076] Here, we will explain with reference to Figure 7 what happens when both the left and right extension working units 3 are switched to a predetermined folded non-working state and tillage work is performed using only the central working unit 2.However, even when the extension working units 3 are in the expanded working state, the leveling bodies 13, 43 are connected to each other, so the same applies as the explanation below.

[0077] First, as shown in Figure 7(a), the first leveling member 31 and the second leveling member 32 of the central leveling body 13 of the central working unit 2 are placed on the upper surface (horizontal surface) of the ridge, and work is started with the central tilling body 12 close to the ridge.

[0078] When the agricultural work machine 1 moves forward from this state, the first ground leveling member 31 rotates downward under its own weight so as to follow the side (inclined surface) of the ridge, as shown in Figure 7(b). At this time, the second ground leveling member 32 rotates upward about the rotation fulcrum P relative to the first ground leveling member 31 due to contact with the side of the ridge, and assumes an inverted posture.

[0079] However, the second ground leveling member 32 is restricted from turning by the contact between the contact portion 194 and the contact receiving portion 195 of the rubber member 192 of the protruding restricting body 181.

[0080] As a result, the center of gravity G of the second ground leveling member 32 in the inverted posture is located behind the vertical line (vertical plane) L passing through the rotation fulcrum P in a side view. In other words, the position of the center of gravity G of the second ground leveling member 32 in the inverted posture does not move forward of the vertical line (vertical plane) L, and does not exceed the vertical line (vertical plane) L.

[0081] Therefore, as shown in Figure 7(c), when the second ground leveling member 32 moves away from the side of the ridge, it rotates downward and rearward under its own weight around the pivot point P relative to the first ground leveling member 31, and this downward rotation automatically changes its position from an inverted position to the desired horizontal position, i.e., the appropriate working position in contact with the rice field surface, which is the field scene.

[0082] Therefore, behind the central tilling body 12, the first soil leveling member 31 and the second soil leveling member 32 of the central soil leveling body 13 properly level the rice field surface.

[0083] In contrast, when using an agricultural implement (comparative example) 1' that does not have a regulating body 181 to perform plowing work on the edge of a field, the second leveling member 32 remains in an inverted position, as shown in Figures 8(a) to (c).

[0084] In other words, as shown in Figures 8(b) and (c), the center of gravity G of the second leveling member 32, which has been placed in an inverted position due to the connecting plate 184 abutting against the rake mounting portion 186, is located forward of the vertical line (vertical plane) L passing through the pivot point P when viewed from the side.Therefore, even if the second leveling member 32 moves away from the side of the ridge, it will not rotate downward and rearward due to its own weight, and work will continue in the inverted position, resulting in insufficient leveling by the central leveling body 13.

[0085] Furthermore, the agricultural work machine 1 described above is provided with a regulating body 181 that regulates the rotation of the second leveling member 32 relative to the first leveling member 31 of the central leveling body 13, and this regulating body 181 regulates the rotation of the second leveling member 32 relative to the first leveling member 31 so that the center of gravity G of the second leveling member 32 is not located forward of the vertical line L passing through the rotation fulcrum P in a side view.Therefore, when performing plowing work at the edge of a field, for example, it is possible to prevent at least the second leveling member 32 (the second leveling member 32, 52 when the extension working part 3 is in the extended working state) from maintaining an inverted position.

[0086] Therefore, it is possible to prevent deterioration of the leveling performance due to the second leveling member 32 being kept upside down, and appropriate plowing work (plowing and leveling work) can be performed even at the edge of the field.In addition, the worker does not have to go to the trouble of getting off the tractor to return the second leveling member 32 to its original position.Moreover, if parts such as an automatic device are installed around the pivot point P, it is possible to prevent the second leveling member 32 from interfering with those parts.

[0087] Furthermore, since the regulating body 181 is a protruding projection that restricts the rotation of the second leveling member 32 by abutting against the second leveling member 32, it can appropriately restrict the rotation of the second leveling member 32 despite having a simple configuration with a small number of parts, and even if mud or debris adheres to the regulating body 181, it does not affect its operation and can appropriately prevent the second leveling member 32 from maintaining an inverted position.

[0088] Furthermore, since the regulating body 181 is protruding from the second support arm (earth-pulling arm) 132 which is rotatably connected to the second ground leveling member 32, the configuration can be simplified, and the regulating body 181 can be easily constructed using, for example, only the pin member 191 and the rubber member 192.

[0089] Furthermore, since the regulating body 181 has a rubber member 192 (for example, rubber hardness in the range of 60 to 80 degrees in type A durometer hardness) that contacts the second leveling member 32, noise, scratches, paint peeling, etc. can be effectively prevented.

[0090] In the above embodiment, the restricting body 181, which is a protruding protrusion, is configured only by the pin member 191 and the rubber member 192. However, the present invention is not limited to this, and may be configured as shown in FIG. 9, for example.

[0091] The regulating body 181' shown in Figure 9 is composed of, for example, a protruding plate 201 protruding from the connecting plate 184 of the mounting portion 182 of the second leveling member (rake) 32, a bolt 203 which is a position-adjustable screw-fitting member which is screwed into the screw hole portion 202 of the protruding plate 201, and a lock nut 204 which is a fixing member which fixes the bolt 203 to the protruding plate 201.

[0092] Then, the head 205 of the bolt 203 comes into contact with the abutment receiving portion 206, which is part of the upper surface of the rake mounting portion 186, thereby restricting the rotation of the second ground leveling member 32. As a result, the center of gravity G of the second ground leveling member 32 is not positioned forward of the vertical line L passing through the rotation fulcrum P in a side view, preventing the second ground leveling member 32 from maintaining an inverted posture. Note that by adjusting the position of the bolt 203, it is possible to fine-tune the position of the center of gravity G of the second ground leveling member 32 when the head 205 of the bolt 203 comes into contact with the abutment receiving portion 206.

[0093] Furthermore, in the above embodiment, a configuration has been described in which the rubber member (e.g., rubber cap) 192 of the regulating body 181 is fixed to the pin member 191, but the present invention is not limited to this, and a configuration in which an elastic member (e.g., rubber or resin member is preferred, but other materials are also acceptable) is detachably attached to a fixed member such as a pin member so that the elastic member can be replaced is also acceptable. Note that the regulating body may be, for example, made of only a single elastic member (e.g., rubber part, resin part, spring part, etc.) that abuts against the second ground leveling member.

[0094] Furthermore, the regulating bodies 181, 181' are not limited to being provided on the second support arm 132 or the second ground leveling member 32, but may be provided on the first ground leveling member 31 or near the rotation fulcrum P, for example.

[0095] 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, for example, a configuration having a work section connected to a traveling vehicle and an extended work section provided at only one of the left and right ends of the work section, or a single-piece configuration without an extended work section. [Explanation of symbols]

[0096] 1 Agricultural machinery 12 Central cultivating body, which is a cultivating body 13 Central leveling body, which is a leveling body 31 First Leveling Member 32 Second Leveling Member 132 second support arm as a connecting body 181,181´ Regulator (protrusion) 192 Elastic rubber material G center of gravity P rotation fulcrum L plumb line

Claims

1. A tilling body that does the tilling work, a ground leveling body having a first ground leveling member and a second ground leveling member rotatable relative to the first ground leveling member; a regulating body that prevents the second ground leveling member from maintaining an inverted posture by regulating the rotation of the second ground leveling member; An agricultural machine characterized by comprising:

2. A tilling body that does the tilling work, a ground leveling body having a first ground leveling member and a second ground leveling member that is rotatable about a pivot point relative to the first ground leveling member; a restricting body that restricts the rotation of the second ground leveling member, The regulating body regulates the rotation of the second ground leveling member relative to the first ground leveling member so that the center of gravity of the second ground leveling member is not located forward of a vertical line passing through the rotation fulcrum in a side view. Agricultural machinery characterized by:

3. The restricting body is a protruding portion.

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

4. A connector is rotatably connected to the second ground leveling member, The regulating body is provided on the connecting body.

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

5. The restricting body has an elastic member that is elastically deformable.

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

6. The elastic member is made of a rubber material with a rubber hardness of 60 to 80 degrees.

6. The agricultural implement according to claim 5.

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