Agricultural implement

Abstract

To provide an agricultural implement which can mitigate a load of an operator.SOLUTION: An agricultural implement 1 includes: a tillage body 12 which performs a tillage work in a state of being covered with a tillage cover part 15; a leveling part 13 for performing a leveling work on a rear side of the tillage part 12; and a grounding pressure adjustment part 61 for adjusting the grounding pressure of the leveling part 13. The grounding pressure adjustment part 61 includes: a drive unit 63; a rotational part 64 which rotates based on a power from the drive unit 63; a connecting part 66 for connecting the tillage cover part 15 and the leveling part 13; and a gas spring 65 provided across the rotational part 64 and the connecting part 66 and urging the leveling part 13 downward.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an agricultural machine for performing agricultural work. [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 machine comprises a body that is connected to the rear of a tractor, for example, a running vehicle; a tilling body that is rotatably mounted on the body and performs tilling work while rotating in a predetermined direction; a leveling body that performs ground leveling work behind the tilling body; a torsion spring that biases the leveling body; an operating lever that is integrally mounted contiguous to one end of the torsion spring; and a lever support that supports the operating lever.

[0004] The torsion spring can be selectively switched between a state in which it urges the ground leveling body in a direction that increases the ground pressure of the ground leveling body, a state in which it urges the ground leveling body in a direction that decreases the ground pressure of the ground leveling body, and a state in which it does not urge the ground leveling body, based on manual operation of the operating lever by the worker. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-58304 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the above-mentioned conventional agricultural machine, when adjusting the ground pressure of the ground leveling body, the operator must manually operate the operating lever connected to one end of the torsion spring and position it in the desired hole in the lever support, which can make adjusting the ground pressure of the ground leveling body time-consuming.

[0007] An object of the present invention is to provide an agricultural work machine that can reduce the burden on the worker. [Means for solving the problem]

[0008] An agricultural working machine according to an embodiment of the present invention comprises a body having a tilling cover portion, a tilling body that performs tilling work while covered by the tilling cover portion, a ground leveling body that performs ground leveling work behind the tilling body, and a ground pressure adjustment portion that adjusts the ground pressure of the ground leveling body, the ground pressure adjustment portion having a driving means, a rotating body that rotates based on power from the driving means, a connecting body that connects the tilling cover portion and the ground leveling body, and a biasing means that is mounted between the rotating body and the connecting body and biases the ground leveling body. [Effects of the Invention]

[0009] According to the embodiment of the present invention, it is possible to reduce the burden on the worker. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of an agricultural machine according to a first embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 5] FIG. 2 is a perspective view of a ground pressure adjusting section of the agricultural work machine. [Figure 6] This is a diagram showing the operation of the rotating body of the ground pressure adjustment unit, where (a) is a diagram showing the rotating body in the first position (free state of the gas spring), and (b) is a diagram showing the rotating body in the second position (pressurized state of the gas spring). [Figure 7] In the operation diagram of the same agricultural implement, (a) shows the state in which the leveling body is working without being biased by the gas spring, and (b) shows the state in which the leveling body is working with being biased downward by the gas spring. [Figure 8]1A and 1B are explanatory diagrams showing a case where the machine body is tilted, in which FIG. 1A is a diagram of an example of the agricultural work machine, and FIG. 1B is a diagram of a comparative example. [Figure 9] 5A and 5B are diagrams showing an agricultural work machine according to a second embodiment of the present invention, in which (a) is a configuration diagram and (b) is an operation diagram (floating state). [Figure 10] FIG. 10 is a diagram showing an agricultural work machine according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing an agricultural work machine according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0012] In the figure, reference numeral 1 denotes an agricultural implement. This agricultural implement 1 is connected to the rear of a tractor (not shown), which is a traveling vehicle, and is a tiller that can perform agricultural work, such as plowing (plowing and leveling) and soil removal, while moving forward (in the direction of travel) across a field as the tractor travels.

[0013] 1 to 4, the agricultural work machine 1 is, for example, a folding work machine with a foldable three-part structure, and includes a central working unit 2 that is detachably connected to a three-point link at the rear of a tractor, extension working units 3 that are provided at both left and right ends of the central working unit 2 so as to be rotatable up and down about rotation center axes (rotation fulcrums) 5, and a hydraulic cylinder (opening / closing cylinder) 4 that serves as rotation drive means for rotating the extension working unit 3 up and down relative to the central working unit 2. The rotation drive means may be, for example, an electric hydraulic cylinder or the like.

[0014] Each of the left and right extension working units (left working unit, right working unit) 3 is placed in an extended working state by rotating in one direction (approximately 180 degrees in the open direction) based on the extension and contraction operation of the hydraulic cylinder 4, and is placed in a folded, non-working state by rotating in the other direction (approximately 180 degrees in the closed direction). Therefore, the agricultural work machine 1 can be selectively switched between a state in which work is performed using only the central working unit 2, a state in which work is performed using the central working unit 2 and both the left and right extension working units 3, and a state in which work is performed using the central working unit 2 and either the left or right extension working unit 3.

[0015] The central working unit 2 comprises a machine body 11 which is detachably connected to the three-point linkage of the tractor, a tilling body 12 which is rotatably mounted on the machine body 11 and performs tilling work while rotating in a predetermined direction, and a soil leveling body 13 which is rotatably mounted in the vertical direction via an elastic rubber plate (elastic member which can be elastically deformed) 10 at the rear end of the tilling cover unit 15 of the machine body 11 and performs soil leveling work behind the tilling body 12.

[0016] The machine body 11 has a three-point connection part 16 that is detachably connected to the three-point link part of the tractor, and this three-point connection part 16 is composed of a top mast 18 that holds a top pin 17 and left and right lower arms 20 that hold lower pins 19.

[0017] The machine body 11 also has a transmission case 21, which is a shaft holder that rotatably holds the input shaft 14, which is connected to the tractor PTO shaft via a joint, and the inner ends of frame pipes 22, which are cylindrical frames that are elongated in the left-right direction, are attached to both the left and right sides of the transmission case 21. A chain case 23 is provided at the outer end of the left frame pipe 22, and a bracket 24 is provided at the outer end of the right frame pipe 22.

[0018] In addition, the power transmission means (not shown) that transmits power from the input shaft to the tillage body 12 is composed of, for example, a gear in the transmission case section 21, a transmission shaft in the frame pipe section 22, and a chain in the chain case section 23.

[0019] The tilling body 12 is mounted on left and right chain case sections 23 and bracket sections 24 that are spaced apart and opposite to each other, and has a left and right tilling shaft 26 that rotates in a predetermined direction based on power from the power transmission means (power from the tractor side), and a plurality of tilling tines 28 that are detachably attached to the claw mounting section 27 of the tilling shaft 26.

[0020] In addition, above the tilling body 12, there is located an approximately plate-shaped tilling cover section 15 that is mounted on the left and right chain case sections 23 and bracket section 24, and this tilling body 12 performs tilling work while rotating in a predetermined direction with its upper section covered by the tilling cover section 15.

[0021] The leveling body 13 has a first leveling body (leveling plate) 31 of approximately rectangular shape attached to the rear end of the tillage cover portion 15 of the body 11 via a rubber plate 10 that is elongated in the left-right direction so as to be rotatable in the vertical direction, and a second leveling body (rake) 32 of approximately rectangular shape attached to the lower end of the first leveling body 31 so as to be rotatable in the vertical direction.

[0022] Spring rakes 33 and 34 are attached to each of the leveling bodies 31 and 32. A plate-shaped front rubber 35 is attached to the front end of the tilling cover part 15. This tilling cover part 15 has a U-shaped frame-shaped arm connecting part 36 on the rear end side.

[0023] The extended working unit 3 comprises an extended body 41 that can rotate up and down around a rotation center axis 5 relative to the body 11 of the central working unit 2, an extended tilling body 42 that is rotatably mounted on the extended body 41 and performs tilling work together with the tilling body 12 of the central working unit 2 when the extended working unit 3 is in the extended working state, and an extended ground leveling body 43 that is rotatably mounted up and down via an elastic rubber plate (elastic member that can be elastically deformed) 40 at the rear end of the tilling cover part 45 of the extended body 41 and performs ground leveling work together with the ground leveling body 13 of the central working unit 2 when the extended working unit 3 is in the extended working state. When the extended working unit 3 is in the extended working state, the ground leveling body 13 and the extended ground leveling body 43 are connected to each other.

[0024] The extension body 41 has a frame pipe section 44, which is a cylindrical frame section that is longitudinal in the left-right direction, and when the extension working section 3 is in the deployed working state, a chain case section 46 is provided at the left end of this frame pipe section 44, and a bracket section 47 is provided at the right end of this frame pipe section 44.

[0025] In addition, the power transmission means (not shown) that transmits power from the transmission shaft (rotating shaft within the frame pipe section) of the power transmission means of the central working unit 2 to the extended tillage body 42 is composed of, for example, a transmission shaft within the frame pipe section 44 and a chain within the chain case section 46.

[0026] The extended tillage body 42 is mounted on left and right chain case sections 46 and bracket sections 47 that are spaced apart and facing each other, and has a left and right tillage shaft 48 that rotates in a predetermined direction based on power from the power transmission means (power from the central working section), and a plurality of tillage tines 50 that are detachably attached to the claw mounting section 49 of this tillage shaft 48.

[0027] In addition, above the extended tillage body 42, there is located an approximately plate-shaped tillage cover section 45 that is mounted on the left and right chain case sections 46 and the bracket section 47, and this extended tillage body 42 performs tilling work while rotating in a predetermined direction with its upper section covered by the tillage cover section 45.

[0028] The extended ground leveling body 43 has a first ground leveling body (leveling plate) 51 which is approximately rectangular and is attached to the rear end of the tillage cover portion 45 of the extended body 41 via a rubber plate 40 which is elongated in the left-right direction so as to be rotatable in the vertical direction, and a second ground leveling body (rake) 52 which is approximately rectangular and is attached to the lower end of the first ground leveling body 51 so as to be rotatable in the vertical direction.

[0029] Spring rakes 53, 54 are attached to the respective soil leveling bodies 51, 52. A plate-shaped front rubber 55 is attached to the front end of the tilling cover part 45.

[0030] Furthermore, a roughly plate-shaped extension rake (side rake) 56 is rotatably attached to the outer end of the second leveling body 52, and this extension rake 56 can be selectively switched between an unfolded working state and a folded non-working state by rotating it using an extension rake switching unit 57.

[0031] The extension rake switching unit 57, which can selectively switch the extension rake 56 between an unfolded working state and a folded non-working state, is composed of, for example, a drive unit (motor unit) 58 having an electric motor as a drive source, a pivoting arm 59, a wire 60, etc.

[0032] On the other hand, as shown in Figures 5 and 6, the agricultural work machine 1 is also equipped with a ground pressure adjustment unit (actuating device) 61 that adjusts the ground pressure of the ground leveling body 13 of the central working unit 2 against the field surface during work (however, when work is performed using the central working unit 2 and the extended working unit 3 in the extended working state, the ground pressure of both the ground leveling body 13 and the extended ground leveling body 43).

[0033] That is, for example, at two locations (one location is also possible, and the location is optional) on the left and right sides of the central working unit 2, there are provided electric ground pressure adjusting units 61 that can be remotely operated (remotely controlled) by a worker on a tractor using an operating unit such as a remote control (not shown) while working in the field (see Figure 2).

[0034] In other words, based on the operation of the operating unit by the worker on the tractor, the ground pressure adjustment unit 61 can adjust the ground pressure of the leveling body 13 (in the unfolded state, the ground pressure of both the leveling body 13 and the extended leveling body 43 in the unfolded state; the same applies below) according to field conditions such as soil quality while the leveling body 13 is in contact with the field and moving forward in the desired working position while performing leveling work during plowing work in the field using at least the tilling body 12 and the leveling body 13 (in the unfolded state, during plowing work using the tilling body 12 and the extended tilling body 42 and the leveling body 13 and the extended leveling body 43).

[0035] More specifically, by remotely operating the ground pressure adjustment unit 61 using a remote control, the operator can change at least the leveling body 13, which is in contact with the field during leveling work and is in contact with the field during plowing work while the tractor is moving, from an unbiased state (a state in which it is not biased by the biasing means) to an increased ground pressure state (a state in which it is biased downward by the biasing means), or conversely, change it from an increased ground pressure state to an unbiased state (this is not limited to a configuration in which the pressure on the leveling body can be turned on and off, but can also be a configuration in which the pressure (biasing force) on the leveling body can be adjusted continuously).

[0036] The left and right ground pressure adjusting units 61 are different in that they are symmetrical, but have the same basic configuration. Also, for example, the left and right ground pressure adjusting units 61 may not be symmetrical but may have the same configuration.

[0037] The ground pressure adjustment unit 61 has a drive unit (motor unit) 63, which is a drive means that can be remotely operated from the tractor side, and a rotating body (cam) 64 that can rotate between at least a first position and a second position around a left-right central axis (rotational fulcrum) 62 based on the power from this drive unit 63.

[0038] In addition, this ground pressure adjustment unit 61 has a connecting body 66 that connects the tillage cover unit 15 of the machine body 11 and the ground leveling body 13, and a gas spring 65 that is a biasing means for increasing ground pressure and is installed between the rotating body 64 and the connecting body 66 and biases the ground leveling body 13 downward via the connecting body 66 when working in the field (when the agricultural work machine 1 is in the working posture).

[0039] The state of the gas spring 65 can be switched (changed) by the rotation of the rotating body 64 based on the power from the drive unit 63. That is, for example, the expandable gas spring 65 can be selectively switched, simply by rotating the rotating body 64, between a state in which it urges the ground leveling body 13 in a direction in which the ground pressure of the ground leveling body 13 increases (downward in the direction in which the ground pressure increases) (a pressurized state in which it is contracted from its natural length), and a state in which it does not urge the ground leveling body 13 (a free state in which it is in its natural length).

[0040] Here, the connecting body 66 connects the tilling cover part 15 that covers the upper part of the tilling body 12 to the soil leveling body 13 that can rotate up and down relative to this tilling cover part 15.

[0041] The connecting body 66 has a first connecting arm 67, which is a longitudinal first connecting member, and has its front end rotatably connected to the arm connecting portion 36 of the tillage cover portion 15 via an axis 71, and has a gas spring 65 rotatably attached to it via an axis 72, and a second connecting arm 68, which is a longitudinal second connecting member, and has its upper end rotatably connected to the rear end, which is the other end of the first connecting arm 67, via an axis 73, and its lower end, which is the other end, rotatably connected to the arm connecting portion 69 of the first ground leveling body 31 via an axis 74.

[0042] The first connecting arm 67 also has a gas spring mounting portion 70 at its front end that protrudes upward, and the base end of the gas spring 65 is rotatably mounted to this gas spring mounting portion 70 via a shaft 72.

[0043] In addition, each of the first connecting arm 67 and the arm connecting portion 36 to which it is connected has an attachment hole (upward biasing hole) 75 formed therein for use when attaching a gas spring 121 that biases the leveling body 13 upward, as described below, but this attachment hole 75 is not necessarily required in this embodiment.

[0044] The drive unit 63 has a storage case 81 that houses an electric motor (drive source), gears, etc., and this storage case 81 is detachably attached to a mounting body 83 by a mounting fixture 82. A mounting plate portion 84 of the mounting body 83 is detachably attached to a mounting portion 87 of a reinforcing member 86 by a mounting fixture 85.

[0045] The reinforcing member 86 is fixed to the upper part of the frame pipe section 22 by welding or the like, and a rotating link 90 is rotatably attached to this reinforcing member 86, and a hydraulic cylinder 4 is attached to this rotating link 90.

[0046] Two mounting holes 89 are formed in the mounting plate 84 of the mounting body 83, and three protruding shafts, namely, a first protruding shaft 91, a second protruding shaft 92, and a third protruding shaft 93, are protruding from the mounting plate 84. A triangular plate 95 is detachably attached to the tips of these three protruding shafts 91, 92, and 93 by means of a mounting fixture 94.

[0047] The plate 95 faces the mounting plate portion 84 of the mounting body 83 at a predetermined distance, and the rotating body 64 is rotatably disposed between the plate 95 and the mounting plate portion 84. A central axis (fixed axis) 62, which is the rotation center of the rotating body 64, is fixed to the plate 95 by welding or the like, and this central axis 62 is inserted into a cylindrical connecting portion 102 of the rotating body 64.

[0048] Furthermore, a shaft insertion hole 96 is formed in the mounting plate portion 84 of the mounting body 83. A drive shaft (rotating shaft) 97, which is an output shaft that outputs power from the electric motor in the storage case 81, is inserted into this shaft insertion hole 96.

[0049] The drive shaft 97 protrudes from the side surface of the storage case 81 and is positioned coaxially with the central axis 62, and a cylindrical connecting portion 102 of the rotating body 64 is fixedly connected to the tip of the drive shaft 97 by a fixing pin 98. That is, for example, the cylindrical connecting portion 102 of the rotating body 64 is fitted onto the outer periphery of the drive shaft 97, and the fixing pin 98 is removably inserted into pin holes formed in the cylindrical connecting portion 102 and the drive shaft 97, and a stop pin 99 is attached to the inserted fixing pin 98. In this way, the rotating body 64 is fixedly attached to the drive shaft 97 of the drive unit 63, and the drive shaft 97 rotates together with the rotating body 64.

[0050] The rotating body 64 has left and right opposing plate portions 101 that are spaced apart and opposed to each other, and a cylindrical connecting portion 102 that integrally connects the opposing plate portions 101 together.

[0051] Each of the opposing plate portions 101 has an arc-shaped (including approximately arc-shaped) elongated hole 103 centered on the central axis 62. Each of the opposing plate portions 101 also has an arc-shaped (including approximately arc-shaped) rotation restriction elongated hole 104 centered on the central axis 62 and shorter than the elongated hole 103.

[0052] A first protruding shaft portion 91, which is a rotation restriction shaft that restricts the rotation of the rotating body 64 by abutting against the end of the rotation restriction elongated hole portion 104, is inserted into the rotation restriction elongated hole portion 104 of the rotating body 64.

[0053] In other words, when the rotating body 64 rotates in one direction, one end of the rotation-restricting long hole portion 104 abuts against the first protruding shaft portion 91, thereby placing the rotating body 64 in a first position (see Figure 6(a)), and when the rotating body 64 rotates in the other direction, the other end of the rotation-restricting long hole portion 104 abuts against the first protruding shaft portion 91, thereby placing the rotating body 64 in a second position (see Figure 6(b)).

[0054] For example, the electric motor of the drive unit 63 may be controlled to stop the rotating body 64 at a preset position (first position and second position), or the electric motor may be controlled to stop the rotating body 64 at any position between the first position and the second position.

[0055] Further, the tip of the gas spring 65 is attached to the elongated hole 103 of the rotating body 64 so as to be slidable (movable) along the elongated hole 103 .

[0056] The gas spring 65 is used to urge the leveling body 13 downward, and has a cylinder portion 106 filled with, for example, nitrogen gas, a rod portion 107 that can move back and forth relative to the cylinder portion 106, and a slide pin portion 108 attached to the tip of the rod portion 107. The gas spring is preferably a free piston type gas spring that has, for example, a free piston inside the cylinder portion.

[0057] The slide pin portion 108 is inserted into the elongated hole portion 103 of the rotating body 64 so as to be slidable along the elongated hole portion 103, and a retaining pin 109 and a retaining ring (washer) 110 are attached to the slide pin portion 108. In addition, the base end portion of the cylinder portion 106 is rotatably attached to the gas spring attachment portion 70 of the first connecting arm 67 via a shaft 72.

[0058] In other words, the gas spring 65 has its one end, the front end (tip end), detachably attached to the rotating body 64, and its other end, the rear end (base end), detachably attached to the first connecting arm 67 of the connecting body 66.

[0059] In this way, the gas spring 65 is detachably installed between the rotating body 64 and the connecting body 66. Since the gas spring 65 is detachable, the ground pressure of the ground leveling body 13 based on the downward bias of the gas spring 65 can be adjusted by, for example, replacing it with a gas spring 65 with a different gas reaction force.

[0060] Also, as shown in Figure 4, the drive unit 63, rotating body 64, mounting body 83, plate 95, central axis 62, etc. of the ground pressure adjustment section 61 are arranged on the front side of the frame pipe section 22 of the body 11.

[0061] The gas spring 65 is disposed below the frame pipe section 22 of the machine body 11, with its front portion positioned forward of the frame pipe section 22. As is also clear from Figure 4, the gas spring 65 is disposed in a generally horizontal position along the front-to-rear direction, and the entire gas spring 65 is disposed above the tillage cover section 15. The position of the gas spring 65 is not limited to a generally horizontal position, and may be any position, such as a generally vertical position.

[0062] Furthermore, a space 105 exists between the ground pressure adjusting section 61 and the tilling cover section 15 of the machine body 11. That is, for example, in a side view, a space 105 of a predetermined size exists between the lower end of the rotating body 64 and the upper surface of the tilling cover section 15.

[0063] On the other hand, as shown in Figures 1 and 2, the agricultural work machine 1 is equipped with a switching unit 111 for the ground leveling body that can selectively switch the ground leveling body 13 of the central work unit 2 between a ground leveling work state (a state in which it can be rotated vertically relative to the body 11) and a soil-pulling work state (a locked state fixed to the body 11), and an extended ground leveling body switching unit 112 that can selectively switch the extended ground leveling body 43 of the extended work unit 3 between a ground leveling work state (a state in which it can be rotated vertically relative to the extended body 41) and a soil-pulling work state (a locked state fixed to the extended body 41).

[0064] The switching unit 111 for the ground leveling body is provided near the center in the left-right direction of the machine body 11 of the central working unit 2. The switching unit 112 for the extended ground leveling body is provided near the center in the left-right direction of the extended machine body 41 of each of the left and right extended working units 3, respectively.

[0065] Each of these three switching units 111, 112 is made up of, for example, a drive unit (motor unit) 113 having an electric motor as a drive source, a first arm 114, a second arm 115, and the like.

[0066] In addition, the seven drive units 58, 63, 113 and two hydraulic cylinders (opening / closing cylinders) 4 equipped on the agricultural work machine 1 can all be remotely controlled from the tractor using an operating unit such as a remote control or the tractor's hydraulic lever, and are independent of each other, so that the drive unit 63 can maintain a pressurized state regardless of the operation of the other drive units 58, 113 or hydraulic cylinders 4.

[0067] Furthermore, the machine bodies 11, 41 of the working units 2, 3 of the agricultural work machine 1 are provided with soil pilers 116 that pile soil into depressions formed in the field when the running parts (rear wheels, etc.) of the tractor pass through. Note that all of the soil pilers 116 may be provided only on the machine body 11.

[0068] Next, the operation of the agricultural work machine 1 will be described.

[0069] For example, a case will be described in which both the left and right extension working units 3 are in the extended working state and the central working unit 2 on the central side and the extension working units 3 on both the left and right sides perform plowing work (land leveling work).

[0070] In a farm field (such as a water-filled rice paddy), when the agricultural implement 1 in a working position is moved forward (in the direction of travel) by the tractor, the tilling body 12 and the extended tilling body 42 perform tilling work, and behind them the leveling body 13 and the extended leveling body 43 perform leveling work.

[0071] Here, as shown in Figure 7(a), when the rotating body 64 of the ground pressure adjustment part 61 is positioned at the first position (first position) due to the abutment between one end of the rotation restriction long hole part 104 and the first protruding shaft part 91, the slide pin part 108 is positioned at the middle part of the long hole part 103 and can move back and forth along the long hole part 103, so the gas spring 65 is not compressed and is in a free state in which it is fully extended to its natural length.

[0072] Therefore, the ground leveling body 13 and the extension ground leveling body 43 are not biased by the gas spring 65, but perform ground leveling work in a state where they are in contact with the field surface with ground pressure based only on their own weight (unbiased state).

[0073] In contrast, as shown in Figure 7(b), when the rotating body 64 of the ground pressure adjusting part 61 is located in the second position (another position) due to the abutment between the other end of the rotation restricting elongated hole part 104 and the first protruding shaft part 91, the slide pin part 108 abuts against the end of the elongated hole part 103 and its forward movement is restricted, so that the gas spring 65 is compressed between the rotating body 64 and the first connecting arm 67 and is in a contracted state (a pressurized state in which it pressurizes the ground leveling body). The relationship of the lengths of the gas springs 65 is "a>b".

[0074] Therefore, the leveling body 13 and the extended leveling body 43 are urged downward based on the urging force (elastic force) of the gas spring 65 in a compressed and shortened state, and leveling work is performed in a state where the ground pressure with the field surface is increased beyond the ground pressure based solely on their own weight (increased ground pressure state).

[0075] During work under such increased ground pressure, if it becomes necessary to release the pressure (bias) applied by the gas spring 65, the worker, while still in the tractor, can simply operate the remote control to drive the electric motor of the drive unit 63 to rotate the rotating body 64 to the first position. In addition, the gas spring 65 can be restored to a pressurized state simply by returning the rotating body 64 to the second position.

[0076] In other words, by remotely controlling the electric motor of the ground pressure adjustment unit 61 using a remote control, the operator can easily adjust the ground pressure of both leveling bodies 13, 43 that are in contact with the field and performing leveling work while continuing the plowing work while the tractor is moving.

[0077] When working using only the central working unit 2, only the ground pressure of the leveling body 13 of the central working unit 2 can be adjusted using the ground pressure adjustment unit 61. When working using the central working unit 2 and either the left or right extension working unit 3, the ground pressure of the leveling body 13 of the central working unit 2 and the ground pressure of the extended ground leveling body 43 of either the left or right extension working unit 3 can be adjusted simultaneously using the ground pressure adjustment unit 61.

[0078] Furthermore, according to the agricultural work machine 1 of the first embodiment described above, the ground pressure adjustment section 61 has a drive unit 63 including an electric motor or the like, a rotating body 64 that rotates based on power from this drive unit 63, a connecting body 66 that connects the tillage cover section 15 of the machine body 11 to the leveling body 13, and a downward biasing gas spring 65 that is installed between these rotating body 64 and connecting body 66 and biases the leveling body 13 downward via the connecting body 66 when in a pressurized state.Therefore, compared to conventional agricultural work machines, the ground pressure of the leveling body 13 and the extended leveling body 43 can be easily adjusted, thereby reducing the burden on the operator.

[0079] In addition, as shown in Figure 8(a), even if the machine body 11 tilts together with the tractor during plowing while the tractor is traveling (the soil leveling body 13 maintains a horizontal position due to the elastic deformation of the rubber plate 10), the angle difference caused by the tilt is absorbed by the connecting portion of the two connecting arms 67, 68 (for example, the hole play around the shaft 73), reducing the load on the gas spring 65 and preventing damage to the gas spring 65. On the other hand, as shown in Figure 8(b), in a configuration (comparative example) that does not use the two connecting arms 67, 68, the angle difference caused by the tilt applies a load to the gas spring 65 that tries to deform it into a curved shape, which may damage the gas spring 65.

[0080] Furthermore, at least the drive unit 63 and the rotating body 64 of the ground pressure adjustment section 61 are arranged on the front side of the frame pipe section 22 of the machine body 11, so that soil (muddy water, etc.) in the field can be prevented from adhering to the drive unit 63 and the rotating body 64 of the ground pressure adjustment section 61 during tillage work.

[0081] Furthermore, since there is a space 105 between the ground pressure adjustment unit 61 and the tillage cover unit 15 of the machine body 11, soil from the field does not get stuck between the ground pressure adjustment unit 61 and the tillage cover unit 15 during tillage work, and even if soil from the field adheres to the upper surface of the tillage cover unit 15, the adhering soil can be easily removed.

[0082] In addition, the ground pressure adjustment unit 61 can adjust the ground pressure of the leveling body 13 that is on the ground in the field and performing leveling work (for example, it is possible to turn the pressure of the leveling body on and off during the leveling work and to adjust the pressure steplessly) based on the operator's operation of the operating unit, at least during the tilling work in the field by the tilling body 12 and the leveling body 13 (while the leveling body is leveling the rice field surface).Since there is no need to lift the agricultural implement 1 with the three-point link unit of the tractor to adjust the ground pressure, the ground pressure (leveling force) of the leveling body 13 can be adjusted according to field conditions such as soil quality while the tilling work is being performed without interrupting the tilling work, and therefore appropriate tilling work (plowing and leveling work) can be performed efficiently to suit the field conditions.

[0083] In addition, the ground pressure adjustment unit 61 of the agricultural work machine 1 may be configured to have a gas spring 121, which is a biasing means for reducing ground pressure (for upward biasing) that biases the ground leveling body 13 (ground leveling body 13, 43 in the unfolded state) upward, as in the second embodiment shown in Figures 9(a) and (b).In this configuration, it is possible to prevent, for example, the ground leveling body 13 of a large agricultural work machine 1 from pressing too much on the soil in the field due to its own weight.

[0084] This gas spring 121 has a cylinder portion 122 filled with, for example, nitrogen gas, and a rod portion 123 that can advance and retreat relative to this cylinder portion 122. The tip end of the rod portion 123 is rotatably attached to the mounting hole 75 of the arm connecting portion 36 via a shaft 124, and the base end of the cylinder portion is rotatably attached to the mounting hole 75 of the first connecting arm 67 via a shaft 125. This gas spring 121 is also detachable and can be replaced with one that has a different gas reaction force. If this gas spring 121 is removed from the mounting hole 75, the configuration of the first embodiment described above is achieved.

[0085] As shown in Figure 9(b), when the tractor is moving and performing tillage work, the leveling body 13 is urged upward based on the biasing force (elastic force) of the gas spring 121 in a compressed and shortened state, and the leveling work is performed in a state where the ground pressure with the field surface is reduced compared to the ground pressure based on its own weight alone (reduced ground pressure state).

[0086] In the case of Figure 9(b), the rotating body 64 is located in the first position and the gas spring 65 is in a free state with its natural length, but when the rotating body 64 is rotated to the second position, the gas spring 65 is compressed and enters a shortened state.

[0087] Therefore, in this case, the biasing forces of both the downward biasing gas spring 65 and the upward biasing gas spring 121 act on the ground leveling unit 13 via the connecting body 66. Therefore, if the downward biasing force of the downward biasing gas spring 65 is greater than the upward biasing force of the upward biasing gas spring 121, the ground leveling unit 13 is biased downward and performs ground leveling work with increased ground pressure. On the other hand, if the downward biasing force of the downward biasing gas spring 65 is less than the upward biasing force of the upward biasing gas spring 121, the ground leveling unit 13 is biased upward and performs ground leveling work with reduced ground pressure. Note that if both biasing forces are the same, the ground leveling unit 13 performs ground leveling work in an unbiased state (free state).

[0088] Furthermore, the agricultural work machine 1 is not limited to a configuration having a rubber plate (elastic plate) 10,40, which is an elastically deformable elastic member, between the tilling cover portion 15,45 and the leveling body 13,43, but may also have a configuration in which such an elastic member is not provided and the leveling body 13,43 is rotatably mounted via an axis 126 at the rear end of the tilling cover portion 15,45, as in the third embodiment shown in Figure 10, for example.

[0089] Furthermore, the configuration is not limited to one in which the ground pressure adjusting unit 61 is provided only in the central working unit 2, and may be one in which the ground pressure adjusting unit 61 is provided in the central working unit 2 and each of the left and right extension working units 3, as in the fourth embodiment shown in Fig. 11. Furthermore, for example, although not shown, the ground pressure adjusting unit 61 may be provided only in the extension working unit 3.

[0090] Furthermore, in each of the above-mentioned embodiments, the configuration is not limited to one in which the lower end of the second connecting arm 68 of the connecting body 66 of the ground pressure adjustment unit 61 is rotatably connected to the first ground leveling body 31, and it may also be, for example, a configuration in which the lower end of the second connecting arm 68 is rotatably connected to the second ground leveling body 32.

[0091] Furthermore, the rotational position of the drive shaft (which may be a rotating body, etc.; the same applies below) may be detected by a detection unit such as a potentiometer, and the rotational position may be displayed (quantified or visualized as a graph, etc.) as a pressure force (a downward biasing force) or a lifting force (an upward biasing force) on a display unit of a terminal, etc. via a control unit. Also, the rotational position of the drive shaft may be detected by a detection unit such as a potentiometer, and the rotation of the drive shaft may be stopped at an arbitrary position, and the position may be stored in the control unit so that it can automatically return to its original position.

[0092] Furthermore, the number of gas springs (elastic bodies) that are biasing means for the ground pressure adjusting section is not limited to one, and may be any number, including a plurality of gas springs.

[0093] Furthermore, the biasing means (expansion means) of the ground pressure adjusting portion may be configured to have, for example, a connecting rod and a spring (an elastic body such as a cylindrical compression spring for applying pressure) provided on the outer periphery of the connecting rod.

[0094] Furthermore, the configuration is not limited to one in which the drive means (motor unit, etc.) operates based on the operation of an operating unit such as a remote control, but may also be one in which the drive means operates based on the detection results of a detection unit that detects field conditions such as soil quality and the state of finish of the field.

[0095] Furthermore, although the agricultural implement has been described as a folding implement with a three-part structure, it may also be, for example, a single implement that cannot be folded, and the leveling body is not limited to one having a first leveling body and a second leveling body, but may be, for example, one having only a leveling plate as the first leveling body.

[0096] Furthermore, the drive source of the drive means for rotating the rotating body of the ground pressure adjusting portion is not limited to a motor, but may be any other suitable source such as a hydraulic cylinder or an electric hydraulic cylinder.

[0097] Furthermore, the operating unit is not limited to a dedicated remote control, but may be, for example, a mobile terminal device onto which a specific application for operating the ground pressure adjusting unit has been downloaded.

[0098] Although several embodiments and modifications of the present invention have been described, it is also possible to combine the embodiments and modifications as appropriate without departing from the gist of the present invention. [Explanation of symbols]

[0099] 1 Agricultural machinery 11 aircraft 12 Cultivating body 13 Land leveling structure 15 Tillage cover 22 Frame pipe section, which is the frame section 61 Ground pressure adjustment unit 63 Drive unit as a driving means 64 Rotating body 65 Gas spring as a biasing means 66 Concatenation 67 First connecting arm as a first connecting member 68 Second connecting arm as second connecting member 91 First protruding shaft portion which is a rotation restricting shaft 103 Long hole part 104 Rotation restriction slot 105 Space part 121 Gas spring as a biasing means

Claims

1. A machine body having a tillage cover portion; A tilling body that performs tilling work while covered by the tilling cover portion; A leveling body that performs leveling work behind the tilling body; A ground pressure adjusting unit is provided to adjust the ground pressure of the ground leveling body, The ground pressure adjusting unit is A driving means; a rotating body that rotates based on power from the driving means; A connecting body that connects the tillage cover portion and the ground leveling body; and a biasing means that is installed between the rotating body and the connecting body and biases the ground leveling body. Agricultural machinery characterized by:

2. The linker is A first connecting member having one end connected to the tillage cover portion and having a biasing means attached thereto; a second connecting member having one end connected to the other end of the first connecting member and the other end connected to the leveling body; 2. The agricultural implement according to claim 1.

3. The biasing means has one end attached to the rotating body and the other end attached to the first connecting member of the connecting body.

3. The agricultural implement according to claim 2.

4. The aircraft body has a frame portion elongated in the left-right direction, At least the drive means and the rotating body of the ground pressure adjusting unit are disposed on the front side of the frame unit.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

5. There is a space between the ground pressure adjustment part and the tillage cover part.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

6. The rotating body has a long hole portion, The biasing means is attached to the elongated hole portion so as to be movable along the elongated hole portion.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

7. The rotating body has a rotation restricting elongated hole portion, A rotation restriction shaft is inserted into the rotation restriction long hole.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

8. The ground pressure adjusting section has a biasing means for biasing the ground leveling body upward.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

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