JP5148345B2 - Agricultural machine - Google Patents

Description

  According to the present invention, there is no problem that the intruding object causes an obstacle to the fitting between the one-side fitting portion and the other-side fitting portion, and the folding working portion is appropriately switched to a desired unfolding working state. It relates to agricultural machines that can.

  DESCRIPTION OF RELATED ART Conventionally, the agricultural working machine described in the following patent document 1, for example is known.

  This conventional agricultural machine has a main body connected to a tractor that is a traveling vehicle, and left and right of the main body that can be rotated to be selectively switched between a folding non-working state and a unfolding working state. And a folding work unit.

  The main body includes a machine body, a cultivating body provided in the machine body for performing a tilling work, and a leveling body provided in the machine body for performing a ground leveling operation behind the cultivating body.

  Further, the folding work unit includes a folding machine body, a folding tiller body provided in the folding machine body and performing a tilling work, and a folding work site provided in the folding machine body and performing leveling work behind the folding tiller body. With body.

And the fold leveling body of the folding work part has a box-like one-side fitting recess composed of a side plate part and a substantially rectangular cylindrical part protruding from the side plate part, The leveling body has the other fitting convex portion that enters into the one side fitting concave portion and fits with the one side fitting portion when the folding working portion is deployed.
Japanese Patent Laying-Open No. 2005-117992 (FIG. 3)

  However, in the above conventional farm work machine, for example, when mud, straw or the like enters the box-like one-side fitting recess, the intruder becomes an obstacle and the one-side fitting recess and the other-side fitting projection There is a risk that the folding work part will not be in the unfolded working state due to a problem in the fitting.

  The present invention has been made in view of the above points, and the folding work is performed without causing troubles in fitting between the one-side fitting portion and the other-side fitting portion due to an intruder. An object of the present invention is to provide an agricultural machine capable of appropriately switching a section to a desired deployment work state.

The agricultural machine according to claim 1 is a main body connected to the traveling vehicle, and the main body is rotatably provided, and the folding is selectively switched between the folding non-working state and the unfolding working state by the rotation. An agricultural work machine that includes a working unit, and may be operated only by the main body unit and may be operated by the main body unit and the folding working unit in the unfolded working state, and the main body unit is a machine body. And a plowing body that is provided in the machine body for plowing work, and a first grounding board that is provided in the machine body and that is rotatably attached to a rear end portion of the first grounding board. And a leveling body that performs leveling work behind the tillage body, and the folding work unit is provided in the folding machine body, the folding tillage body that is provided in the folding machine body and performs the tilling work, and the folding provided tatami body, pivotally to the rear end of the first extension leveling plate and the first extension leveling plate A second extension leveling plate mounted, and a folded ground leveling member for a ground leveling work behind the folding plow body, before Kioritatami leveling member first extension grading plate and the second extension leveling plate each having a side plate portion and one side fitting portion of the schematic cross-sectional configured by facing plate portion only which projects from the side plate portion a pair of spaced apart opposing U-shaped, first integer of the ground leveling of Each of the ground plate and the second ground leveling plate has an other-side fitting portion that enters into the one-side fitting portion and engages with the one-side fitting portion when the folding working portion is in the unfolding operation state. .

  The agricultural machine according to claim 2 is the agricultural machine according to claim 1, wherein the opposing plate portion of the one side fitting portion is a fitting plate portion orthogonal to the side plate portion, and the mutual separation distance is in the protruding direction. A guide plate portion that is inclined with respect to the fitting plate portion so as to gradually increase toward the fitting plate portion.

  The agricultural machine according to claim 3 is the agricultural machine according to claim 1 or 2, wherein the one side fitting portion is formed by bending one plate material.

  The agricultural machine according to claim 4 is the agricultural machine according to any one of claims 1 to 3, wherein the one side fitting part is in a state where the one side fitting part and the other side fitting part are fitted to each other. There is a gap between the side plate portion and the other side fitting portion.

  According to the first aspect of the present invention, even if mud, dredging or the like enters the one-side fitting portion having a substantially U-shaped cross section, the intruder can be easily discharged from the one-side fitting portion. The folding work part can be appropriately switched to a desired unfolding work state without causing troubles in the fitting between the one-side fitting part and the other-side fitting part due to an obstacle.

  According to the invention which concerns on Claim 2, the other side fitting part can be smoothly entrapped in one side fitting part by guiding the other side fitting part to the fitting plate part side in a guide plate part. .

  According to the third aspect of the present invention, the one-side fitting portion can be formed very easily and accurately by forming the one-side fitting portion by bending one plate material.

  According to the invention of claim 4, there is a gap between the side plate portion of the one side fitting portion and the other side fitting portion in a state where the one side fitting portion and the other side fitting portion are fitted to each other. For this reason, it is possible to effectively prevent the fitting failure between the one-side fitting portion and the other-side fitting portion.

A related technique of the agricultural machine according to the present invention will be described with reference to the drawings.

  1 to 3, reference numeral 1 denotes an agricultural machine. The agricultural machine 1 is connected to the rear portion of a tractor (not shown), which is a traveling vehicle, for example, and is used for scraping work while moving forward on the field by traveling of the tractor. This is a three-fold folding type scraper.

  The farm work machine 1 includes a central work part 2 that is connected to a three-point link (work machine lifting support device) at the rear part of the tractor and is a main body part that is a left and right longitudinal body that performs a tilling work by power from the tractor. .

  Moreover, the agricultural working machine 1 is provided at the both ends in the left and right direction of the central working unit 2 so as to be pivotable in the vertical direction about a folding shaft (rotation center axis X) 4 in the front-rear direction as a pivotal fulcrum. The left and right folding work sections are formed in a left and right longitudinal direction that are selectively switched between the folding non-working state and the unfolding working state by the rotation, and perform the tilling work by the power from the central working unit 2 in the unfolding working state. An extension working unit 3 is provided.

  Both extension work parts 3 are symmetrically configured and can be rotated with respect to the central work part 2, and each extension work part 3 is predetermined in one direction (deployment direction) around the folding shaft 4. The unfolded working state is located outside the central working unit 2 by turning the angle, for example, approximately 180 degrees, and the unfolded working state is locked by a locking means (not shown). In addition, each extension work unit 3 is not folded and positioned above the central work unit 2 by a predetermined angle in the other direction (folding direction) around the folding shaft 4, for example, approximately 180 degrees. Then, it is locked in the folding non-working state by a locking means (not shown). Note that the rotation angle of the extension working unit 3 is other than 180 degrees, and may be 150 degrees, 90 degrees, or the like, for example.

  The central working unit 2 is a left-right longitudinal body 6 connected to a three-point link at the rear of the tractor, and a tiller that is rotatably provided on the body 6 and rotates in a predetermined direction by power from the tractor. It has a body 7 and a leveling body 8 provided at the rear end of the body 6 so as to be rotatable in the vertical direction and performing leveling work behind the tillage body 7.

  The airframe 6 has a cylindrical frame portion 11 that is elongated in the left-right direction. A gear box portion 12 is connected to the longitudinal center portion of the frame portion 11, and the input shaft 13 faces forward from the gear box portion 12. Protruding. The input shaft 13 is connected to a PTO shaft (not shown) of the tractor via a universal joint, a transmission shaft, and the like.

  Further, an upper portion of a transmission case portion 15 such as a chain case serving as a shaft support portion is attached to one end portion in the longitudinal direction of the frame portion 11, and the transmission case portion 15 is opposed to the other end portion in the longitudinal direction of the frame portion 11 so as to be separated from each other. An upper portion of a plate-like bracket portion 16 that is a shaft support portion is attached. Further, the machine body 6 has a tillage cover portion 17 that covers the top of the tillage body 7, and a front end side of the leveling body 8 is rotatably attached to a rear end portion of the tillage cover portion 17.

  The tiller 7 is rotatably supported by the lower part of the transmission case 15 and the lower part of the bracket part 16 which are opposed to each other, and is connected to the input shaft 13 and housed in the frame part 11 and the transmission case part 15. The rotary shaft 21 is a horizontal tillage shaft that rotates by receiving power from the transmission means that does not.

  That is, for example, one end portion in the axial direction of the rotating shaft 21 is rotatably supported at the lower portion of the transmission case portion 15, and protrudes outward from the outer surface of the transmission case portion 15 among the one end portion in the axial direction of the rotating shaft 21. One side engaging body (center side clutch pawl) 22 is attached to the part. Similarly, the other axial end portion of the rotating shaft 21 is rotatably supported at the lower portion of the bracket portion 16, and the other axial end portion of the rotating shaft 21 faces outward from the outer surface of the bracket portion 16. One side engaging body (center side clutch pawl) 22 is attached to the protruding portion. The one side engagement body 22 has a plurality of convex engagement portions 22a arranged in the circumferential direction.

  In addition, a plurality of tilling claws (not shown) that rotate with the rotating shaft 21 and perform a tilling work are attached to the claw holder portion 21a of the rotating shaft 21. The plurality of tilling claws are substantially square-shaped when viewed from the front, and are arranged at equal intervals from one end side to the other end side of the rotating shaft 21 in the axial direction. The tip of the tilling claw closest to the transmission case portion among the plurality of tilling claws moves near the inner surface of the transmission case portion 15 when the rotary shaft 21 rotates, and is closest to the bracket portion 16 among the plurality of tilling claws. The tip of the tilling claw moves near the inner surface of the bracket portion 16 when the rotary shaft 21 rotates.

  The leveling body 8 is a first leveling body which is a first leveling body in the left-right direction and attached to the rear end portion of the tillage cover portion 17 of the body 6 so as to be pivotable in the vertical direction about the horizontal axis 27. It has a main plate (flat plate) 25. The shaft 27 is inserted into a long hole 28 formed in the tillage cover portion 17. The rear end portion of the tillage cover portion 17 and the front end portion of the first leveling plate 25 are connected by an elastic plate 30. In addition, a second leveling plate (rake) 26, which is a second leveling body that is long in the left-right direction, can be pivoted up and down about a horizontal axis 29 at the rear end of the first leveling plate 25. It is attached.

  The first leveling plate 25 is composed of only a side plate portion 31 along the vertical plane and a pair of opposed plate portions 32 that protrude outward from the upper and lower ends of the side plate portion 31 and face each other. One side fitting portion 33 having a substantially U-shaped cross-section and opening in the front and rear direction is provided at both ends in the left-right direction, and this one side fitting portion 33 is integrally formed by bending, for example, a single metal plate. Is formed.

  That is, for example, the first leveling plate 25 has a main body plate portion 34 in the left-right direction that performs leveling work with a front and rear inclined posture, and the side plate portions 31 are vertically arranged at both left and right ends of the main body plate portion 34. The side plate part 31 is connected and fixed in a planar shape, and the opposing plate part 32 protrudes integrally from the part of the upper edge part and the part of the lower edge part of the side plate part 31 outwardly. Each counter plate portion 32 is inclined with respect to the fitting plate portion 35 so that the distance between the fitting plate portion 35 and the fitting plate portion 35 orthogonal to the side plate portion 31 gradually increases in the protruding direction. The upper and lower guide plate portions 36 are arranged in a substantially C shape in which the distance between them is gradually increased in the protruding direction (outward direction).

  Similarly, the second leveling plate 26 includes only a side plate portion 41 along the vertical plane and a pair of opposed plate portions 42 that protrude outward from the upper and lower ends of the side plate portion 41 and face each other. The one-side fitting portion 43 having a substantially U-shaped cross section and having an opening in the front-rear surface is provided at both ends in the left-right direction. The one-side fitting portion 43 is formed by bending, for example, a single metal plate. Are integrally formed.

  That is, for example, the second leveling plate 26 has a main body plate portion 44 in the left-right direction that performs leveling work in a horizontal posture along a horizontal plane. The opposing plate portions 42 are integrally projected outwardly from a part of the upper edge portion and the lower edge portion of the side plate portion 41, respectively. Each of the opposing plate portions 42 is inclined with respect to the fitting plate portion 45 so that the distance between the fitting plate portion 45 and the fitting plate portion 45 orthogonal to the side plate portion 41 gradually increases in the protruding direction. The upper and lower guide plate portions 46 are arranged in a substantially C shape in which the distance between them is gradually increased in the protruding direction (outward direction).

  The extension working part 3 is attached to both ends in the longitudinal direction of the frame part 11 of the machine body 6 of the central working part 2 via the folding shaft 4 so as to be rotatable in the vertical direction around the folding shaft 4. An extension machine body 51 that is a folding machine body, and an extension field body that is a folding farm body that is rotatably provided on the extension machine body 51 and rotates in a predetermined direction by power from the cultivation body 7 of the central working unit 2. Folding and leveling work is carried out at the rear of the extended tillage body 52 in a state connected to the leveling body 8 of the central working unit 2 and provided at the rear end of the extension body 51 so as to be rotatable in the vertical direction. And an extended leveling body 53 which is a body.

  The extension body 51 has a flat plate-like inner plate (inner cover side plate) 55 and a flat plate-like outer plate (outside is a bar side plate) 56 on both the left and right sides. A tilling cover portion 57 that covers the upper portion of the extended tillage body 52 is provided between the upper portions. When the extension working unit 3 is in the unfolding work state, the inner plate 55 is a side plate that is in close proximity to the transmission case unit 15 or the bracket unit 16 of the central working unit 2, and the outer plate 56 is at the end in the left-right direction of the agricultural work machine 1. It is a side plate located.

  Further, the lower end edge portion of the inner plate 55 is formed in a substantially arc shape, and a bearing plate 59 is provided in a protruding shape toward the outer plate 56 side at the lower end edge portion of the substantially arc shape. That is, the bearing plate 59 protrudes from the lower edge of the inner plate 55 toward the outer plate 56 side and the lower side. The axially opposite ends of the rotary shaft 61 that is the tilling shaft of the extended tillage body 52 are rotatably supported by the bearing plate 59 on the inner plate 55 side and the lower portion of the outer plate 56.

  That is, for example, one end portion in the axial direction of the rotating shaft 61 is rotatably supported by the bearing plate 59, and the outer surface of the bearing plate 59 among the one end portion in the axial direction of the rotating shaft 61 (the surface facing the central working portion 2). The other side engagement body (folding side clutch pawl) 62 is attached to a portion protruding outward from the other side. The other side engaging body 62 is disposed at a position on the inner side of the inner side plate 55 and does not protrude from the inner side plate 55 toward the central working part side. The other-side engaging body 62 engages with the one-side engaging body 22 of the central working portion 2 when the extension working portion 3 is in the unfolding operation state, and power is supplied from the rotating shaft 21 of the tillage body 7 to the rotating shaft 61 of the extending tillage body 52. It has a plurality of convex engaging portions 62a that enter between the engaging portions 22a adjacent to each other in the circumferential direction of the one-side engaging body 22. Note that the other axial end of the rotating shaft 61 is rotatably supported by the lower portion of the outer plate 56.

  In addition, a plurality of tilling claws (not shown) are attached to the claw holder portion 61a of the rotating shaft 61 to rotate with the rotating shaft 61 and perform a tilling operation when the extended working portion 3 is in the unfolding operation state. The plurality of tilling claws are substantially square-shaped when viewed from the front, and are arranged at equal intervals from one end side to the other end side of the rotating shaft 61 in the axial direction.

  Then, at least one tilling claw in the plurality of tilling claws, that is, for example, the tip of the tilling claw closest to the bearing plate (inner plate 55) 59 among the plurality of tilling claws is in the unfolding operation state of the extension working portion 3. When the rotary shaft rotates, the outer peripheral side position of the bearing plate 59 is moved and the position near the inner surface of the inner plate 55 is moved.

  The extension leveling body 53 is a first extension leveling body having a longitudinal direction that is attached to the rear end portion of the tilling cover portion 57 of the extension machine body 51 so as to be pivotable in the vertical direction about a horizontal horizontal axis 73. A first extended leveling plate (extended flat plate) 71 is provided. The shaft 73 is inserted into a long hole 75 formed in the tillage cover portion 57. The rear end portion of the tillage cover portion 57 and the front end portion of the first extension leveling plate 71 are connected by an elastic plate 76. In addition, a second extended leveling plate (extended rake) 72, which is a second extended leveling body that is elongated in the left-right direction, is provided at the rear end of the first extended leveling plate 71 in the vertical direction about a horizontal horizontal axis 74. It is pivotally attached.

  The first extension leveling plate 71 is inserted into the one side fitting portion 33 of the first leveling plate 25 and fitted to the one side fitting portion 33 when the extension work portion 3 is deployed. It has a joint part 77.

  That is, for example, the first extended leveling plate 71 has a main body plate portion 78 in the left-right direction that performs leveling work in a leaning posture before and after high and low, and side plate portions 79 are provided at both ends of the main body plate portion 78 in the left-right direction. It is connected and fixed in a vertical plane. Of the left and right side plate portions 79, a part of the inner side plate portion 79 facing the side plate portion 31 of the first leveling plate 25 of the central working portion 2 when the extension working portion 3 is unfolded is formed in a plate shape. The other side fitting portion 77 is configured. As shown in FIG. 3, the other side fitting portion 77 is fitted between the two fitting plate portions 35 of the one side fitting portion 33 of the first leveling plate 25 when the extension working portion 3 is in the unfolded state. Thus, both the fitting plate portions 35 are fitted and in contact with the side plate portion 31. Therefore, the first leveling plate 25 and the first extension leveling plate 71 are connected to each other, and the first leveling plate 25 and the first extension leveling plate 71 are integrated with each other in the vertical direction with respect to the body 6 and the extension body 51. The ground leveling work is performed while rotating.

  Similarly, the second extension leveling plate 72 enters the one side fitting portion 43 of the second leveling plate 26 when the extension work portion 3 is in the unfolding operation state, and is fitted to the one side fitting portion 43. A side fitting portion 81 is provided.

  That is, for example, the second extended leveling plate 72 has a left and right main body plate portion 82 that performs leveling work in a horizontal posture along a horizontal plane, and side plate portions 83 are vertically disposed at both left and right ends of the main body plate portion 82. It is connected and fixed in a planar shape. Of the left and right side plate portions 83, the substantially rectangular tube attached to the inner side plate portion 41 facing the side plate portion 41 of the second leveling plate 26 of the central working portion 2 when the extended working portion 3 is in the unfolding state. In the rectangular tube portion 84, the other-side fitting portion 81 having a substantially rectangular tube shape and a square pipe shape is configured. The other side fitting portion 81 is fitted between both the fitting plate portions 45 of the one side fitting portion 43 of the second leveling plate 26 when the extension working portion 3 is in the unfolding operation state. It will be in the state which fitted and contacted the side-plate part 41. FIG. Therefore, the second leveling plate 26 and the second extension leveling plate 72 are connected to each other, and the second leveling plate 26 and the second extension leveling plate 72 are integrated with each other in the vertical direction with respect to the body 6 and the extension body 51. The ground leveling work is performed while rotating.

  The distance between the two fitting plate portions 35 of the one side fitting portion 33 is slightly longer than the dimension A of the other side fitting portion 77, and the distance between the two fitting plate portions 45 of the one side fitting portion 43 is the other side fitting. It is slightly longer than the dimension B of the joint portion 81.

  In addition, the agricultural working machine 1 includes left and right rotation driving means (not shown) that rotate the extension working unit 3 about the folding shaft 4 in the vertical direction about 180 degrees with respect to the central working unit 2. Yes.

  Next, the operation and the like of the farm work machine 1 will be described.

  For example, when working with the maximum work width, the left and right extension working parts 3 are rotated about the folding shaft 4 with respect to the central working part 2 by the power from the turning drive means. Switch to.

  When the extension work part 3 is in the unfolding work state, the one side engagement body 22 of the tillage body 7 of the central work part 2 and the other side engagement body 62 of the extension tillage body 52 of the extension work part 3 are engaged with each other. At the same time, the one side fitting part 33 of the first leveling plate 25 of the central working part 2 and the other side fitting part 77 of the first extended leveling board 71 of the extension working part 3 are fitted together, and the central working part The one side fitting portion 43 of the second second leveling plate 26 and the other side fitting portion 81 of the second extended leveling plate 72 of the extension work portion 3 are fitted to each other.

  In this state, when the rotary shaft 21 of the tillage body 7 of the central working unit 2 rotates, the rotational force of the rotary shaft 21 is transmitted to the rotary shaft 61 of the extended tillage body 52 via both engaging bodies 22 and 62, and the extended tillage is performed. The rotation shaft 61 of the body 52 rotates, and as a result, the cultivation work is performed by the cultivation claws of the cultivation body 7 and the cultivation claws of the extended cultivation body 52. Further, the first leveling plate 25 and the first extended leveling plate 71 connected to each other at the rear position of the tillage body 7 and the rear position of the extended tillage body 52, and the second leveling plate 26 and the second extended leveling plate connected to each other. Leveling work is performed at 72.

  For example, when working only with the central working unit 2 or when working with the central working unit 2 and either the left or right extension working unit 3, both the extension working unit 3 or the left and right working units are driven by the power from the rotation driving means. Any one of the extension working parts 3 is rotated with respect to the central working part 2 around the folding shaft 4 to switch to the folding non-working state.

  And according to the said agricultural working machine 1, even if mud, a fence, etc. penetrate | invade into one side fitting part 33,43 of the cross-section substantially U-shaped cross section of the leveling body 8 of the center working part 2, the intruding substance is one side. Since it can be easily discharged from the side fitting parts 33, 43, the intruder becomes an obstacle and the one side fitting parts 33, 43 of the leveling body 8 of the central work part 2 and the extended leveling body 53 of the extension work part 3 There is no problem in fitting with the other side fitting parts 77 and 81, and the extension work part 3 is rotated by a predetermined angle with respect to the central work part 2 to be appropriately switched to a desired deployment work state. Can do.

  Further, the other side fitting parts 77, 81 of the extended ground leveling body 53 are guided to the fitting plate parts 35, 45 side by the guide plate parts 36, 46, so that the other side fitting parts 77, 81 are fitted to one side. The one side fitting parts 33, 43 and the other side fitting parts 77, 81 can be fitted to each other by smoothly entering the parts 33, 43.

  Furthermore, since the one-side fitting portions 33 and 43 are formed by bending one plate material, for example, compared with a case where another plate member is formed on the side plate portion by welding or the like, the one-side fitting portions 33 and 43 are formed. Can be formed very easily and accurately.

In the related art , when the extension working part 3 is in the unfolding work state, the fitting parts 77, 81 on the other side are in contact with the side plate parts 31, 41, and both the fitting parts 35 of the one side fitting parts 33, 43 are in contact. , 45 has been described. For example, as shown in FIG. 4, the fitting plate portions 35, 45 of the one-side fitting portions 33, 43 and the other-side fitting portions 77, 81 are fitted to each other. In such a state, a gap 90 exists between the side plate portions 31 and 41 of the one side fitting portions 33 and 43 and the portion of the other side fitting portions 77 and 81 facing the side plate portions 31 and 41. Also good.

  In this case, for example, even if mud, dredging or the like remains in the one-side fitting portions 33, 43, there is a gap 90, so that the one-side fitting portions 33, 43 and the other-side fitting portions 77, 81 There is no problem in the fitting, and the extension work part 3 can be appropriately switched to a desired development work state by rotating the extension work part 3 by a predetermined angle with respect to the central work part 2.

Here, an embodiment of the present invention will be described.

Agricultural working machine 1 according to an embodiment of the present invention, unlike the related art, has an extended leveling body 53 of the extension work part 3 having one-side fitting parts 33 and 43 having a substantially U-shaped cross section, and The ground leveling body 8 of the central working unit 2 is configured to have the other side fitting parts 77 and 81 to be fitted to the one side fitting parts 33 and 43 .

Incidentally, for example, divided into three foldable not limited to the configuration of, may be configured such that for example, with a central working portion 2 and the left or right of the extended working unit 3.

It is a side view of the agricultural working machine which concerns on the related technique of this invention. It is a partial rear view of an agricultural working machine same as the above. It is the partial bottom view which abbreviate | omitted the 2nd leveling board and 2nd extension leveling board of the agricultural working machine same as the above. It is the partial bottom view which abbreviate | omitted the 2nd leveling board and 2nd extension leveling board of the agricultural working machine which concern on the other related technology of this invention.

DESCRIPTION OF SYMBOLS 1 Farm work machine 2 Central work part which is main part 3 Extension work part which is folding work part 6 Airframe 7 Tillage body 8 Ground leveling body
25 First leveling board
26 Second leveling board
31, 41 Side plate
32, 42 Opposite plate
33, 43 One side fitting
35, 45 Mating plate
36, 46 Guide plate
51 Extension body which is a folding body
52 Extended tilled body
53 Extended leveling body which is a folding leveling body
71 First extension leveling board
72 Second extension leveling board
77, 81 Fitting part on the other side
90 gap

Claims (4)

A main body connected to the traveling vehicle;
The main body portion is provided so as to be rotatable, and includes a folding working portion that can be selectively switched between a folding non-working state and a deployment working state by turning,
Agricultural working machine that has a case of working only with the main body part and a case of working with the main body part and the folding work part in the unfolding work state,
The main body is
The aircraft,
A plowing body that is provided on this machine and performs plowing work;
A first leveling plate and a second leveling plate rotatably attached to a rear end portion of the first leveling plate, the leveling unit performing leveling work behind the tillage body; Prepared,
The folding working unit is
Folding machine,
A folding tiller that is provided in this folding machine and performs tillage work,
A first extension leveling plate and a second extension leveling plate rotatably attached to a rear end portion of the first extension leveling plate , provided on the folding machine body; Folding ground leveling body to work,
Each of the first extension grading plate and the second extension leveling plate before Kioritatami leveling body,
One side fitting portion having a substantially U-shaped cross section composed of only a side plate portion and a pair of opposing plate portions protruding from the side plate portion and opposed to each other,
Each of the first leveling plate and the second leveling plate of the leveling body,
An agricultural work machine characterized by having an other side fitting part that enters into the one side fitting part and fits into the one side fitting part when the folding work part is in the unfolding work state. The opposing plate portion of the one-side fitting portion has a fitting plate portion orthogonal to the side plate portion and an inclined shape with respect to the fitting plate portion so that the distance between each other gradually increases in the protruding direction. The agricultural working machine according to claim 1, further comprising a guide plate portion. The agricultural working machine according to claim 1 or 2, wherein the one side fitting portion is formed by bending a single plate material. A gap exists between the side plate portion of the one side fitting portion and the other side fitting portion in a state where the one side fitting portion and the other side fitting portion are fitted to each other. Item 4. The agricultural machine according to any one of Items 1 to 3.

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