JP2002186304A - Farm work machine and method for maintenance work for rotary - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a farm work machine of which maintenance works can be efficiently carried out. SOLUTION: This farm work machine 1 is equipped with a rotary 16 that plows and crushes the soil, a soil grader 30 that grades the crushed and plowed soil and a setting unit 31 that sets the soil grader 30. The setting unit 31 can be set to the soil-grading state at which the soil is graded by means of the grader 30 and to the soil-mulching state at which the soil is collected for mulching. The setting unit 31 can set the soil grader to the maintenance work state at which the grader 30 is almost all exposed toward the rear direction. The soil grader 30 is positioned higher than the rotary shaft of the rotary 16 in the maintenance work state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work machine provided with a leveling body for flattening soil plowed and crushed by a rotary, and a maintenance work method for the rotary.

[0002]

2. Description of the Related Art A conventional agricultural working machine is provided with, for example, a rotary which rotates and plows soil, and a terrain body which is rotatably positioned behind the rotary. And the terrain,
By the setting means consisting of the operating lever body, etc., it is set to the leveling work state where the earth leveling work for flattening the soil plowed by the rotary is performed, or to the state where the soil is pulled to pull the soil. I do.

[0003]

However, in the above-described conventional construction machine, it takes time and effort to clean the rotary or to replace the rotary claw, for example, and the rotary maintenance may not be performed efficiently. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an agricultural work machine and a rotary maintenance method capable of efficiently performing rotary maintenance work.

[0005]

According to a first aspect of the present invention, there is provided an agricultural working machine, comprising: a rotary for plowing and cultivating soil; a leveling body for flattening the soil plowed by the rotary; Select one of the following: a leveling work state in which leveling work is performed to flatten the cultivated soil, a soil working state in which soil is pulled to pull the soil, and a maintenance work state in which the rotary is exposed rearward. And setting means that can be set dynamically.

In this configuration, the setting means can set the leveling body in the maintenance operation state in addition to the leveling operation state and the burping operation state, and the rotary can be exposed rearward. It is possible to perform the maintenance work of the rotary more efficiently.

According to a second aspect of the present invention, in the first aspect of the present invention, the leveling body is positioned and fixed at a position higher than the rotary shaft of the rotary during the maintenance operation state.

[0008] In this configuration, the ground preparation body is positioned and fixed at a position higher than the rotary shaft of the rotary during the maintenance work state, so that the maintenance work of the rotary can be performed more reliably and efficiently. .

According to a third aspect of the present invention, there is provided the agricultural working machine according to the first or second aspect, wherein the setting means includes an operating lever body, a rotary engaging body that rotates in response to operation of the operating lever body, An operation engagement body that is disengageable from the rotation engagement body, wherein the rotation engagement body is configured to allow movement of the operation engagement body during a leveling operation state of the ground adjustment body; And a second engaging portion that engages with the working engagement body during the maintenance work state of the terrain body when the soil removal operation is performed. is there.

[0010] In this configuration, although the configuration is simple, the operation engagement body is disengaged from the rotation engagement body by operating the operation lever body, so that the ground adjustment body is brought into the ground adjustment work state. , Can be appropriately set to the soiling work state and the maintenance work state.

According to a fourth aspect of the present invention, there is provided the agricultural working machine according to the third aspect, wherein the operating lever body and the rotary engaging body are integrally formed.

In this configuration, since the operating lever body and the rotary engaging body are formed integrally, compared with a configuration in which a separate connecting member or the like is provided between the operating lever body and the rotary engaging body. And the number of parts is reduced.

According to a fifth aspect of the present invention, in the rotary maintenance method, by rotating the terrain body upward to a position where the rotary is exposed rearward, the engagement pin of the rotating arm interlocked with the terrain body is moved. A step of contacting the pin contact portion of the rotation engagement member, and by rotating the operation lever body after the engagement pin and the pin contact portion contact,
Engaging the engagement pin with the engagement recess of the rotary engagement body that is interlocked with the operation lever body, so that the rotary can be easily exposed rearward, Rotary maintenance work can be performed efficiently.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the agricultural working machine according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an agricultural work machine. The agricultural work machine 1 is a tow-type scraping device or the like which is detachably mounted on a tractor T as a towing vehicle as a traveling vehicle and used. While moving on the paddy field by a towing operation, the paddy field is tilled and crushed to level the surface of the paddy field in a horizontal plane.

As shown in FIGS. 1 and 2, the agricultural work machine 1 includes a machine frame 2. One top mast 4 having a top pin 3 and a lower pin are provided on the upper front side of the machine frame 2. A three-point connecting portion 7 is provided as a tractor connecting portion, which is a connecting portion composed of a pair of left and right lower arms 6 having a pair of lower arms 6 and 6. The three-point connecting portion 7 is detachably connected to a three-point link mechanism (three-point hitch portion) T1 as a support device for lifting and lowering the hydraulic working machine provided at the rear of the tractor T. Note that the three-point link mechanism T1 is
Two top links a, two lower links b in pairs on the left and right,
b etc. (see FIG. 7 etc.).

As shown in FIGS. 1 and 2, the machine frame 2 has an elongated main frame 11 having a longitudinal direction in the left-right direction, and a transmission case or the like is provided at a central portion of the main frame 11 in the longitudinal direction. The input shaft holding part 12 consisting of
The input shaft 13 in the front-rear direction is rotatably held by the input shaft holding unit 12. The input shaft 13 is connected to a P (not shown) of the tractor T.
Connected to the TO shaft via a universal joint, etc.
The driving force from the tractor T is input to the agricultural work machine 1 side.

At both ends in the longitudinal direction of the main frame 11, side plate frames 15, 15 made of a pair of left and right chain cases, brackets, etc., which are elongated and substantially rectangular in a side view and have a longitudinal direction in the vertical direction, are spaced apart from each other. The upper end is attached.

Between the lower parts of both side plate frames 15, a rotary 16 as a tilled soil body for tilling a paddy field is provided rotatably. The rotary 16 is a double-sided board frame 15
A left-right rotation shaft 17 is mounted horizontally between the lower ends, and a plurality of claws 18 are provided on a claw mounting portion (not shown) of the rotation shaft 17.
Are mounted side by side with an interval in the axial direction,
Each claw 18 projects radially from the rotation shaft 17. During the maintenance work of the agricultural work machine 1, the rotary shaft 17 of the rotary 16 is exposed rearward.
The claw mounting portion is exposed rearward, so that the claw 18 can be easily replaced.

From the lower rear end of each side plate frame 15, a side cover body 21 as a plate-like protrusion projects rearward, and the side cover bodies 21, 21 are rotatable.
It is arranged on both sides of the side plate 16 and prevents the soil discharged from the rotary 16 together with the side plate frame 15 from scattering to the side.

On the other hand, an upper cover body 22 is disposed above the rotary 16 as a slightly curved cover body having an elongated, substantially rectangular plate shape having a longitudinal direction in the left-right direction and having a central portion in the width direction bulging upward. The upper cover body 22 prevents the earth discharged from the rotary 16 from scattering upward.

At the rear end of the upper cover body 22, a front end of an elastic connecting body 26 such as a rubber plate as an elastically deformable connecting body in the form of an elongated rectangular plate having a longitudinal direction in the left-right direction is attached. I have. At the rear end of the elastic connecting body 26, a front end of a first earth grading body 27 such as an elongated substantially rectangular plate-like flat plate having a longitudinal direction in the left-right direction is attached. At the rear end of the first terrain body 27, a front end of a second terrain body 28 such as an elongated substantially rectangular plate-shaped rake plate having a longitudinal direction in the left-right direction is provided with a shaft 29 such as a pin in the left-right direction. It is rotatably mounted via.

Then, the elastic connection body 26, the first ground adjustment body 27,
The second terrain body 28 and the like constitute a terrain body 30 which is a terrain means. The terrain body 30 flattens the soil plowed by the rotary 16 and deforms the elastic coupling body 26. On the front end side, that is, on the front end side, that is, the rear end side can be turned up and down. In addition, the terrain body 30 is
Is configured to be rotatable in the left-right direction based on the deformation of.

On the other hand, in FIG. 1 and FIG. 2, reference numeral 31 denotes a setting means which is an operation setting means as a switching operation mechanism for switching and setting the state of the terrain body 30.
For example, the soil leveling work 30 is performed in a leveling operation in which the soil leveled by the rotary 16 is flattened by the rotary 16 (a rotatable free state shown in FIG. 1), and the soil that has risen high at a ridge or the like is drawn. A soil removal operation state in which the soil removal operation is performed (a substantially vertical soil removal locked state shown in FIG. 3);
The configuration is such that substantially the entire 16 can be selectively set to each state of a maintenance work state (substantially horizontal maintenance lock state shown in FIG. 6) in which it is exposed (opened) rearward. .

First, the setting means 31 includes a pair of right and left mounting frames 32, 32 fixed to the input shaft holding portion of the machine frame. A shaft-shaped spring holding member 36 holding a torsion spring 34 as a biasing body is bridged between the two mounting frames 32, and a stopper 37 serving as shaft-shaped locking means.
Are bridged, and a support shaft 38 for the plate is bridged.

On the upper rear end of the mounting frame 32, a front end of a rotary engaging plate 41 as a rotary engaging body, which is a plate-like cam body rotatable vertically within a predetermined range, is supported. The rotation engagement plate 41 is rotatably mounted via a shaft 38, and the rotation engagement plate 41 is rotatable up and down around the support shaft 38 in the left and right direction, that is, the rear end side is raised and lowered about the front end side. It is configured to be rotatable.

Here, as shown in FIG. 4, the rotation engagement plate 41 has a lever mounting step 42 formed at a front end which is one end. And the lever mounting step
The lower end of a rod-shaped operation lever body 43 is fixed to 42, and the operation lever body 43 and the rotation engagement plate 41 are integrally formed. The operation lever body 43 can be rotated around the support shaft 38. It has become. A protruding spring mounting portion 45 is formed below the front end of the rotation engagement plate 41, and one end of the torsion spring 34 is inserted and connected to the connection hole 46 of the spring mounting portion 45, and the other portion of the torsion spring 34 is connected. The end side is inserted and connected to the connection hole 32a of the left mounting frame 32 (FIG. 2).

The rotation engaging plate 41 has a movement permitting portion 48 formed by cutting out a lower end portion.
Is a slender space for allowing the movement of the engaging pin 50 (movement in the direction A in FIG. 1), which is a lock pin as an action engaging body, in the state of the leveling operation of the leveling body 30. First pin contact portion 51 and second pin contact portion as pin contact portion
Located between 52 and. Further, a first stopper contact portion 53 is formed at a position near a second pin contact portion 52 which is a pin contact portion on a front lower end surface of the rotary engagement body 41,
A second stopper contact portion 54 is formed near the spring attachment portion 45. Each of the first stopper contact portion 53 and the second stopper contact portion 54 comes into contact with a predetermined portion of the cylindrical outer peripheral surface of the stopper 37 while being urged by the torsion spring 34,
The first stopper contact portion 53 and the second stopper contact portion
At 54, the rotation range of the rotation engagement plate 41 is set.

Further, the rotary engagement plate 41 is formed with a notch at the rear lower portion, and is formed as a first elongated engagement portion which engages with the engagement pin 50 when the earth-removing body 30 is in the soil-pulling operation state. One engagement recess 56 is provided. The open lower end of the elongated first engagement recess 56 communicates with one end of the movement permitting portion 48,
The upper end of the first engagement recess 56 extends to near the upper edge of the rotation engagement plate 41, and a pin holding portion 56a is formed at the upper end. The width dimension of the first engagement recess 56 is the engagement pin 50
The engagement pin 50 slides along the longitudinal direction of the first engagement recess 56 in the first engagement recess 56. The first pin contact portion 51 is located below the first engagement recess 56, and the first pin contact portion 51 projects forward from the lower end of the arc-shaped rear end edge 55. It has become.

The rotating engagement plate 41 is formed with a notch at the lower portion on the front side, and engages with the engagement pin 50 during the maintenance work state of the grading body 30 (the state for performing the maintenance work of the rotary). It has a second engaging concave portion 57 as a second engaging portion that is an engaging concave portion. The open lower end of the second engagement recess 57 communicates with the other end of the movement permitting portion 48. The second engaging concave portion 57 has a tapered shape due to the presence of the protrusion 58 for retaining, and the upper side which is the front side has a substantially circular shape having a size slightly larger than the outer diameter of the engaging pin 50. The rotation engagement plate
A shaft insertion hole portion 59 through which the support shaft 38 is inserted is formed in the front side of 41. Further, the movement permitting portion 48, the first engagement recess 56, and the second engagement recess 57 are continuous with each other.

On the other hand, the setting means 31 corresponds to FIGS.
As shown in FIG. 5, a rotary arm 61 having an elongated shape in a substantially front-rear direction and having an engaging pin 50 is provided, and a front end of the rotary arm 61 is provided at a lower rear end of the mounting frame 32 for an arm. It is rotatably mounted via a support shaft 62. The rotating arm 61 is configured to be rotatable up and down around a support shaft 62 in the left and right direction, that is, rotatable so that the rear end side moves up and down around the front end side. The rotating arm
An engagement pin 50 having a circular cross section whose axial direction coincides with the left-right direction is fixed to the front upper portion of the 61.

At the rear end of the rotating arm 61, the upper end of a connecting rod 63 such as a hanging rod having a longitudinal direction substantially in the vertical direction rotates via a shaft 64 such as a pin in the left-right direction. Mounted as possible. The lower end of the connecting rod 63 is rotatably connected to the connecting plate 28a of the second terrain body 28 via a shaft 65 such as a pin in the left-right direction.

Next, the operation of the embodiment will be described.

First, a case where a leveling work (scratching work) is performed using the agricultural work machine 1 will be described.

When performing the leveling work, the operator must use setting means.
At 31, the terrain body 30 is laid out in the terraining work state shown in FIG.
It is set to a free state in which it can rotate based on the force received from the field side.

In the state shown in FIG. 1, the engaging pin 50 of the rotating arm 61 is located in the movement permitting section 48 and is free to move in the direction of FIG. Are in a state of being rotatable around the support shaft 62 for the arm. Also,
The rotation engagement plate 41 is urged by the torsion spring 34 in a direction in which the rotation engagement plate 41 is to be rotated upward, and the second stopper contact portion 54 is in contact with a predetermined portion on the front side of the stopper 37 and is in pressure contact with the stopper 37.

Then, as shown in FIG. 7, with the three-point link mechanism T1 of the tractor T lowered the farm work machine 1 to a predetermined position, the farm work machine 1 is moved in the forward direction by the towing operation of the tractor T.

Then, the soil is plowed and crushed by the rotary 16 which is driven and rotated by the driving force from the tractor T, and the crushed soil discharged from the rotary 16 and raised is used as the first ground 27 and the second ground 22 of the ground 30. Leveled and suppressed in body 28. Thus, the surface of the paddy field becomes flat in a horizontal plane.

In this operation, the engaging pin 50 is moved in accordance with the vertical movement of the second leveling body 28 which is a flat plate.
The movement of the engagement pin 50 is performed by the first pin contact portion 51 and the second
Since it is regulated by the pin contact portion 52, the second terrain body 28 moves up and down within a predetermined range without moving up and down more than necessary.

Next, a case in which the agricultural work machine 1 is used to perform a soil removal operation will be described.

Before the above-mentioned scraping work, when moving the soil that has risen high at the ridge or the like to the lower side, the operator uses the setting means 31 to move the terrain body 30 into the soil removal work state shown in FIG. In other words, the lock is set to a slightly inclined, substantially vertical soil pull lock state.

For example, when the leveling body 30 is switched from the leveling operation state shown in FIG. 1 to the soiling operation state shown in FIG. 3, the worker on the tractor T lifts the agricultural work machine 1 with the three-point link mechanism T1. While maintaining the state in which the terrain body 30 is raised from the field scene or the like, the operation lever body 43 is moved to the position where the first stopper contact portion 53 of the rotation engagement plate 41 integrated with the operation lever body 43 Until it touches the specified part on the side
Rotate in a predetermined direction (direction A in the figure) (operation lever body
Press 43).

Then, the engagement pin 50 which has been in contact with the first pin contact portion 51 enters the first engagement recess 56, and the first
It moves along the engagement concave portion 56 and is engaged and held by the pin holding portion 56a at the upper end.

In response to the movement of the engagement pin 50, the second terrain body 28 is pushed downward by the connecting rod 63, and the second terrain body 28 rotates downward around the shaft 29. As a result, the first terrain body 27 and the second terrain body 28 are located on substantially the same plane and are in a non-rotatable burping locked state (state of FIG. 3).

Then, as shown in FIG. 8, with the three-point link mechanism T1 of the tractor T lowered the farm work machine 1 to a predetermined position, the farm work machine 1 is moved in the forward direction by the towing operation of the tractor T. Then, the raised soil A is drawn to the lower side in the second leveling body 28 of the leveling body 30.

After the soil removal operation is completed, for example, when the terrain body 30 is switched from the soil removal operation state shown in FIG. 3 to the land adjustment work state shown in FIG.
As shown in FIG. 4, while the agricultural work machine 1 is lifted by the three-point link mechanism T <b> 1 and the terrain body 30 is lifted up from the field scene or the like, the operation lever body 43 is moved and the engagement pin 50 is rotated. Until the first pin contact portion 51 of the mating plate 41 comes into contact with the first plate contact portion 51, the turning operation is performed in a predetermined direction (direction B in the drawing) (the operation lever body 43 is pulled).

During this operation, the biasing direction of the torsion spring 34 changes. That is, in the first half of the operation, the rotation engagement plate 41 is urged by the torsion spring 34 in a direction in which the rotation engagement plate 41 is to be rotated downward (clockwise direction, which is the direction of the white arrow in FIG. 4). It is urged by the spring 34 in a direction to rotate upward (counterclockwise direction which is the direction of the white arrow in FIG. 5).

After the pulling operation of the operating lever body 43, the operator
Lower the agricultural work machine 1 with the three-point link mechanism T1, and
The lower end of 0 is grounded, for example, in a field scene. Then, FIG.
As shown in the figure, the first pin contact portion in the first engagement recess 56
The engagement pin 50 that has been in contact with the upper surface 51a of the
8 and comes into contact with the front surface 51b of the first pin contact portion 51 (the state shown by the two-dot chain line in FIG. 5). That is, the terrain
The engagement pin 50 separates from the upper surface 51a of the first pin contact portion 51 based on the ground of 30, and the rotation engagement plate 41 rotates in the direction B in the drawing by the urging force of the torsion spring 34. ,
The engagement pin 50 that has been in contact with the upper surface 51a of the first pin contact portion 51
Moves into the movement permitting portion 48, and the front surface of the first pin contact portion 51
It comes into contact with 51b (the state shown by the two-dot chain line in FIG. 5).

In this manner, the engagement between the first engaging recess 56 and the engaging pin 50 is released, and the locked state of the terrain body 30 is released, so that the terrain body 30 is turned suitable for scraping work, transportation and the like. It becomes a movable free state.

Next, a case where the maintenance work of the agricultural work machine 1 is performed will be described.

For example, the claw 18 of the rotary 16 and the upper cover body
When cleaning the inner surface side of the inner surface 22 and the inner surface side of the side cover body 21 and replacing the claw 18 of the rotary 16, etc.
At 31, the terrain body 30 is set to the maintenance work state shown in FIG. 6, that is, a substantially horizontal maintenance lock state.

For example, when the leveling body 30 is moved from the leveling operation state in FIG.
In the case of switching to the maintenance work state for the maintenance of the rotary 16 shown in (1), the worker lifts the agricultural work machine 1 with the three-point link mechanism T1 and raises the terrain body 30 from the field scene or the floor of the warehouse ( After that, the vehicle descends from the tractor T.

Then, the worker turns around the farm work machine 1 and turns the terrain body 30 upward with one hand to push the engaging pin 50 of the turning arm 61 into the turning engagement plate. 41 is brought into contact with the second pin contact portion 52.

After the engagement pin 50 is brought into contact with the second pin contact portion 52, the operator rotates the operation lever body 43 with the other hand in any predetermined direction (A direction in the drawing). And the engagement pin
The engagement pin 50 is engaged with the second engagement recess 57 by the second engagement recess 57. Thus, the first terrain
The 27 and the second terrain body 28 are positioned substantially on the same plane and are in a non-rotatable maintenance lock state (the state of FIG. 6).

In the state shown in FIG. 6 or in the state shown in FIG. 9 in which the agricultural work machine 1 is raised to a higher position by the three-point link mechanism T1, the second terrain body 28 is rotated by the rotary shaft 17 of the rotary 16.
At a higher position or a position higher than the whole rotary 16,
It is positioned and fixed, and the rotary 16 is held in an exposed state open to the rear. For this reason, the operator
Maintenance work for 16 etc. can be easily performed.

After the maintenance work, for example, when the grading body 30 is switched from the maintenance work state shown in FIG. 6 to the terrain work state shown in FIG. 1, the worker riding on the tractor T uses the three-point link mechanism T1 to operate the agricultural work machine 1. Raise the earth 3
While maintaining the state where 0 is raised from the field scene, etc.,
By operating the operation lever body 43 in a predetermined direction (direction B in the drawing), the engagement between the second engagement recess 57 and the engagement pin 50 is released.

Then, as shown in FIG.
Is rotated downward by its own weight, and the engagement pin 50 is
The inside moves rearward and comes into contact with the front surface 51b of the first pin contact portion 51. In this way, the locked state of the terrain body 30 is released, and the terrain body 30 is brought into a rotatable free state suitable for scraping work, transport and the like.

As described above, according to the above embodiment, one operating lever 43 that can be operated while riding on the tractor T is provided.
The leveling body 30 is set in the leveling work state (scratching work state) and the towing work state (burrowing work state) by the setting means 31 having
In addition to the above two states, the maintenance work state can be further set, so that the rotary 16 can be easily exposed to the rear and the maintenance work of the rotary 16 can be performed efficiently.

That is, the switching operation mechanism, which is the setting means 31 for fixing the soil and fixing the soil (during the scraping operation / transportation), can be further fixed at the maintenance position. Leveling body 30 using switching operation mechanism
By setting and fixing the maintenance work state, as shown in FIG. 9, the entire terrain body 30 can be positioned and fixed at a position higher than the upper end position of the rotary 16, and the terrain body 30 is substantially horizontally, that is, slightly inclined, for example. Because it is possible to maintain the front-low and post-high postures, the cleaning of the claw 18 of the rotary 16 and the claw of the rotary 16 are performed.
When replacing 18 or the like, the leveling body 30 does not become an obstacle, and maintenance work can be performed efficiently.

Setting means as one switching operation mechanism
Since the configuration can be set to three states, that is, the leveling work state, the soiling work state, and the maintenance work state at 31, the structure can be simplified compared to, for example, a structure in which means for setting the maintenance work state are separately provided, and assembly is possible. Work can be facilitated, manufacturing costs can be reduced, and the appearance is good.

On the other hand, since the operation lever 43 and the rotation engagement plate 41 are integrally formed as one member, a separate connection is provided between the operation lever 43 and the rotation engagement plate 41. Compared to a configuration in which members and the like are provided, the number of parts is small, assembly work can be facilitated, and manufacturing costs can be reduced.

In the above-described embodiment, the agricultural work machine 1 such as a substitute device has been described as a tow-type configuration which is used by being attached to the tractor T.
A self-propelled configuration may be provided by providing a drive unit or the like for a traveling engine or the like that does not require a towing vehicle such as a tractor T.

In each of the above embodiments, the configuration in which the manual operation of the operation lever 43 is required for setting the terrain body 30 has been described. For example, although not shown, a drive source such as a motor or a cylinder is used. Or the like may be provided so that the ground preparation body 30 can be set to each work state by remote control.

Further, in any of the above embodiments, the operation lever 43 is described as being integrally provided at the front end of the rotary engagement plate 41. For example, although not shown, the operation lever 43 is mounted on the tractor T. In order to approach the tractor T side so that it can be easily operated while holding it, a communication member or the like may be provided between the operation lever body 43 and the rotation engagement plate 41.

The terrain body 30 is composed of the first terrain body 27 and the second
The configuration is not limited to the terrain body 28 and the like. For example, although not shown, the upper cover body 22
Attach the front end of the terrain to the rear end of the terrain via pins, etc., and move the terrain up and down. It is good also as a structure rotatable in the left-right direction.

[0066]

According to the first aspect of the present invention, the grading body can be set to the maintenance work state in addition to the terrain work state and the earth removal work state by the setting means, and the rotary can be exposed rearward. Therefore, the maintenance work of the rotary can be performed more efficiently than the conventional configuration.

According to the second aspect of the present invention, the leveling body is positioned and fixed at a position higher than the rotary shaft of the rotary during the maintenance operation, so that the rotary maintenance can be performed more reliably and efficiently. Can be.

According to the third aspect of the present invention, although the structure is simple, the operation engaging body is disengaged from the rotary engaging body by operating the operation lever body, so that the ground shaping body is provided. Can be appropriately set to the leveling work state, the burrowing work state, and the maintenance work state.

According to the fourth aspect of the present invention, since the operation lever body and the rotation engagement body are integrally formed, a separate connecting member and the like are provided between the operation lever body and the rotation engagement body. Compared with the configuration, the number of parts is small, the assembly work can be easily done,
Manufacturing costs can be reduced.

According to the fifth aspect of the invention, the rotary can be easily exposed rearward, and the maintenance work of the rotary can be performed with high working efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of an agricultural working machine according to the present invention.

FIG. 2 is a partial plan view of the agricultural working machine.

FIG. 3 is a side view of the agricultural work machine in a soil lock state.

FIG. 4 is a side view of the rotating engagement body of the agricultural working machine.

FIG. 5 is a side view of the rotary engaging body of the agricultural working machine.

FIG. 6 is a side view of the agricultural work machine in a maintenance locked state.

FIG. 7 is a side view of the agricultural working machine at the time of leveling work.

FIG. 8 is a side view of the agricultural working machine at the time of soil removal work.

FIG. 9 is a side view of the agricultural work machine during maintenance work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agricultural work machine 16 Rotary 30 Ground adjustment object 31 Setting means 41 Rotation engagement plate as rotation engagement body 43 Operation lever body 48 Movement permitting part 50 Engagement pin as action engagement body 52 Second pin as pin contact part Contact portion 56 First engagement recess as first engagement portion 57 Second engagement recess as second engagement portion that is an engagement recess

Claims (5)

[Claims] 1. A rotary for plowing and crushing soil, a terrain body for flattening the soil cultivated by the rotary, and a terrain work for flattening the soil cultivated by the rotary for the soil. There is provided setting means that can be selectively set to each of a leveling work state, a soil work state in which the soil is drawn to pull the soil, and a maintenance work state in which the rotary is exposed rearward. A farm work machine characterized by the above-mentioned. 2. The agricultural work machine according to claim 1, wherein the leveling body is positioned and fixed at a position higher than the rotary shaft of the rotary in a maintenance operation state. 3. The setting means includes an operation lever body, a rotation engagement body that rotates in response to operation of the operation lever body, and an operation engagement body that can be disengaged from the rotation engagement body. A movement permitting portion that allows movement of the working engagement body during a leveling operation state of the ground-fixing body, and a first engagement that engages with the action engaging body during a soil-drawing operation state of the ground-setting body. The agricultural work machine according to claim 1, further comprising: a second engaging portion that engages with the operation engaging member in a maintenance operation state of the terrain body. 4. The agricultural working machine according to claim 3, wherein the operation lever body and the rotary engagement body are formed integrally. 5. The rotary body is rotated upward to a position where the rotary is exposed rearward, so that an engaging pin of a rotary arm interlocking with the rotary body is brought into contact with a pin contact portion of the rotary engaging body. A step of contacting, and after the engagement pin and the pin contact portion are in contact with each other, by rotating the operation lever body, the engagement recess of the rotation engagement body interlocked with the operation lever body A step of engaging the engagement pin.