JP4801426B2 - Folding farm work machine - Google Patents

Description

  The present invention relates to a folding farm machine that can fold an extension work body.

  Such a folding farm work machine includes a work machine main body having a plowing body that performs the plowing work and a leveling body that is pivotably positioned at the rearward position in the vertical direction, and a width direction of the work machine main body. An extension having an extended tillage body that is provided at the outer end so as to be foldable and extends, and extends the work width of the tillage body, and an extension leveling body that is positioned at the rear position so as to be pivotable in the vertical direction. 2. Description of the Related Art There is known a work body and an auxiliary ground leveling body that is rotatably provided at an outer end portion of an extension work body and that can be switched between an expanded state and a folded state (non-use state) by the rotation.

In such a folding farm work machine, when the extension work body is folded, if the auxiliary leveling body rotates downward due to its own weight with respect to the extension work body and attempts to hang down, the auxiliary leveling body swings and extends during transportation, etc. noise is generated by collision with the working member, or the auxiliary ground leveling member or extension work body there is a fear of breakage. For this reason, a means for regulating the rotation of the auxiliary leveling body is required.

  Then, the folding farm work machine (patent work machine in a literature) of patent documents 1 which can control rotation of an auxiliary leveling machine is proposed. As shown in FIG. 7A (rear view), this folding farm work machine 81 is formed with a drooping prevention hole 82a at the outer front end portion of the auxiliary leveling body 82, and a substantially central portion in the left-right direction of the leveling plate 87. A rotation restricting arm 84 having an insertion portion 84a capable of entering and exiting from the drooping prevention hole portion 82a is attached to the front surface side. The work machine main body 85 and the extension work body 86 of the folding farm work machine 81 are operated adjacent to the extension leveling board 83 and the extension leveling board 83 by operating an operation lever (not shown) provided on the machine frame of the work machine main body 85. The ground leveling plate 88 on the machine body side can be switched between the work standby position and the folding standby position shown in FIG. 7B. When the folding standby position is reached, the extended leveling plate 83 is in a substantially vertical state, and the drooping prevention hole portion 82a. Thus, the insertion portion 84a of the rotation restricting arm 84 is inserted to restrict the rotation of the auxiliary leveling body 82.

Japanese Patent No. 3655896

  In the conventional folding farm work machine 81, when the extended working body 86 is in the folded position, the ground leveling plate 88 and the extended leveling board 83 are placed in the work standby posture after the auxiliary leveling body 82 is folded (not in use). Thus, it is necessary to regulate the rotation of the auxiliary leveling body 82. For this reason, the conventional folding farm work machine 81 cannot perform the folding work of the extension work body 83 unless it enters the folding work of the extension work body after putting the leveling board 88 and the extended leveling board 83 into the work standby posture. In addition, there is a problem that labor is required for the folding work of the extension work body 83.

  This invention is made | formed in view of such a problem, and it aims at providing the folding agricultural work machine which can fold the extended work body without taking an effort.

  In order to achieve the above object, a folding farm machine according to the present invention includes a tiller that performs tillage work, and a work machine body that has a leveling body that is positioned at a rearward position of the tiller so as to be pivotable in the vertical direction. And an extended tillage body that is foldably pivotably provided at the end of the work machine body in the width direction, and is positioned so as to be vertically rotatable at a rear position of the extension tillage body that extends the work width of the tillage body. In a folding farm work machine equipped with an extended leveling body that performs leveling work and an auxiliary leveling body that can be rotated at the outer end of the extended leveling body, the rotation of the auxiliary leveling body relative to the extended leveling body is restricted. Rotation regulating means (for example, the second rotation regulating means 70 in the embodiment) is provided, and the rotation regulating means regulates the rotation of the auxiliary leveling body that is not used in conjunction with the opening / closing operation of the extension work body. Further, the rotation restriction is canceled.

  According to the present invention, the rotation restricting means for restricting the rotation of the auxiliary leveling body with respect to the extended leveling body is the rotation restriction and the rotation restriction of the unused auxiliary leveling body in conjunction with the opening / closing operation of the extension work body. By performing the release, it is possible to perform the rotation restriction and the rotation restriction release of the auxiliary ground leveling body that is not in use only by opening and closing the extension work body. For this reason, it is possible to save the trouble of performing the rotation restriction or the rotation restriction release of the auxiliary leveling body during the opening / closing operation of the extension work body.

  Further, the rotation restricting means of the present invention regulates the rotation of the auxiliary leveling body that is not in use when the extension work body is rotated to the side to be folded, and the auxiliary leveling body that is not in use when the extension work body is in the deployed position. The rotation restriction is canceled.

  According to the present invention, the rotation restricting means restricts the rotation of the auxiliary leveling body that is not in use when the extension work body is rotated to the side where the extension work body is folded, and assists in the non-use state when the extension work body is in the deployed posture. When the extension work body is rotated to the folding posture side by releasing the rotation restriction of the leveling body, the rotation restriction means rotates the auxiliary leveling body in the unused state in conjunction with the closing operation of the extension work body. regulate. For this reason, it is possible to save the trouble of restricting the rotation of the auxiliary ground leveling body that is not in use when the extended working body is folded. When the extended working body in the folded posture is set to the unfolded posture, the rotation restricting means releases the rotation restriction of the auxiliary ground leveling body in the unused state in conjunction with the opening operation of the extending work body. For this reason, it is possible to save the trouble of canceling the rotation restriction of the auxiliary leveling body when the extended working body is set to the deployed posture.

Further, the rotation restricting means of the present invention is not limited to the normal work posture in which the leveling body and the extended leveling body can be rotated in the vertical direction according to the unevenness of the field and the state of the field by the switching means provided in the work machine body. Even if it is switched to any of the soiling work postures that cannot rotate, the auxiliary ground leveling body that is not in use is controlled to rotate and cancel the rotation in conjunction with the opening / closing operation of the extension work body. To do.

  According to this invention, the rotation restricting means assists the unused state in conjunction with the opening / closing operation of the extended work body, regardless of whether the leveling body and the extended leveling body are in the normal work position or the earthing work position. By performing the rotation regulation of the leveling body and releasing the rotation regulation, the extension work body can be moved while the rotation of the auxiliary leveling body in the unused state is regulated without being affected by the posture of the leveling body and the extended leveling body. The auxiliary leveling body can be unfolded from the extended working body in the unfolded posture. In this way, when the extended working body is in the deployed position, the rotation restriction of the unused auxiliary leveling body is released, so even if the leveling body and the extended leveling body are in the earthing work posture, the auxiliary leveling body can be opened and closed. It is possible to improve the usability of the agricultural machine.

  Further, the rotation restricting means of the present invention is not used when the extended working body rotates to the folding posture side, regardless of whether the leveling body and the extended leveling body are switched to the normal work position or the earthing work position by the switching means. The rotation of the auxiliary leveling body in the state is restricted.

  According to this invention, the rotation restricting means is in a non-use state when the extended leveling body rotates to the side where the extended leveling body is folded, regardless of whether the leveling leveling body and the extended leveling leveling body are in the normal work position or the earthing work position. By restricting the rotation of the auxiliary leveling body, the rotation of the auxiliary leveling body in the unused state is restricted when the extension working body rotates to the side where it is folded regardless of the postures of the leveling body and the extended leveling body. For this reason, when the extension work body is folded, the unused auxiliary leveling body rotates and collides with other parts to generate noise, and the auxiliary leveling body or the extension work body is reliably prevented from being damaged. be able to.

Further, the rotation restricting means of the present invention is provided so that it can be inserted into and removed from a fixed hole provided in the leveling body, and is movably provided in the extended leveling body. A fixed rod for connecting and releasing the body, a biasing means for biasing the fixed rod toward the leveling body (for example, the compression spring 74 in the embodiment), an engagement pin provided at an end of the fixed rod, and an auxiliary A biasing means provided on the leveling body and having a hook that can be engaged with the engaging pin, and the connection of the extended leveling body to the leveling body by the fixed rod is released by the rotation of the extended leveling body relative to the leveling body. Thus, the fixed rod is moved to the leveling body side, and the engaging pin is locked to the hook to restrict the rotation of the auxiliary leveling body in the folded state .

According to this invention, when the extended leveling body rotates relative to the leveling body , the rotation restricting means causes the fixed rod to be moved by the biasing means as the connection of the extended leveling body to the leveling body by the fixed rod is released. It moves to the leveling body side and the engaging pin is locked by the hook to restrict the rotation of the auxiliary leveling body in the folded state. For this reason, it is possible to perform rotation restriction and rotation restriction release of the extended leveling body relative to the leveling body and rotation restriction and rotation restriction release of the auxiliary leveling body relative to the extension leveling body by the rotation restriction means. The engaging pin is provided on the fixed rod. When the fixed rod is already provided on the agricultural machine, the rotation restricting means can be configured by using the fixed rod. . For this reason, the increase in the number of parts can be suppressed and the cost increase of the agricultural machine can be suppressed.

  According to the folding agricultural work machine according to the present invention, the rotation restricting means for restricting the rotation of the auxiliary leveling body relative to the extended leveling body is provided, and this rotation restricting means is not used in conjunction with the opening / closing operation of the extension work body. By performing the rotation restriction and the release restriction release of the auxiliary leveling body in the state, it is possible to provide a folding farm machine capable of folding the extension work body without taking time and effort.

  A preferred embodiment of a folding agricultural machine according to the present invention will be described below with reference to FIGS. The present embodiment will be described below by taking an example of a folding farm work machine as a substitute among the folding farm work machines. For convenience of explanation, the following description will be made with the directions of arrows shown in FIG. 1 (plan view) as the front-rear direction and the left-right direction.

  As shown in FIG. 1, the folding farm work machine 1 is attached to the rear part of the traveling machine body 90 and advances along with the traveling of the traveling machine body 90 to perform a substitute work. A main body 10, an extension working body 30 attached to both left and right ends of the extension work body so as to be rotatable in the vertical direction, and an auxiliary leveling body attached to an outer end portion of the extension work body 30 in the horizontal direction so as to be rotatable in the vertical direction. 50, and the working machine body 10 and the extension work bodies 30 and 30 form a three-part structure.

  The front part of the work machine body 10 is provided with a connecting part connected to a three-point link connecting mechanism provided at the rear part of the traveling machine body 90, and the folding agricultural work machine 1 is connected to the connecting part so as to be moved up and down by this connecting part. Is done. A gear box 12 is provided at the front portion of the work machine body 10 so that power from the PTO shaft of the traveling machine body 90 is transmitted to the gear box 12 through power transmission means such as a universal joint.

  The work machine main body 10 has a tillage body (not shown) such as a rotary that performs tillage work, and the top of the tillage body is covered with a machine frame 13 that also serves as a cover body. A substantially plate-shaped leveling body 14 is provided at the rear end of the machine frame 13 so as to be pivotable in the vertical direction at the rear position of the tillage body and perform leveling work.

  The leveling body 14 includes a substantially flat plate-shaped first leveling plate (apron) 15 whose front end is pivotally connected to the rear end of the machine frame 13 and rotatable in the vertical direction, and a rear end of the first leveling plate 15. And a substantially plate-shaped second leveling plate (level plate) 16 that is pivotally connected to the front end portion and can be rotated in the vertical direction.

  The extension work bodies 30 disposed on the left and right sides have a symmetrical structure, and an extension tillage body (not shown) such as a rotary that extends the work width of the tillage body of the work machine body 10 to the side, and an extension tillage. An extended leveling body 31 that is positioned so as to be pivotable in the vertical direction at a rear position of the body and performs leveling work. The upper side of the extended tillage body is covered with an extension machine frame 35 that also serves as a cover body.

  The extended leveling body 31 is a substantially plate-like member that is attached to the rear end portion of the extension machine frame 35 so as to be rotatable in the vertical direction and performs leveling work. The extended leveling body 31 is joined to and connected to the outer end of the leveling body 14 when the extension work body 30 is deployed, and is separated from the outer end of the leveling body 14 when the extended leveling body 31 is folded. Thus, the joint with the leveling body 14 is released.

  The extended leveling body 31 includes a first extended leveling plate 32 and a first extended leveling plate 32 having a substantially plate shape whose front end portion is pivotally connected to the rear end portion of the extension machine frame 35 and rotatable in the vertical direction. The front end portion is pivotally connected to the rear end portion and has a substantially plate-like second extended leveling plate (level plate) 33 that can be rotated in the vertical direction.

  Further, an auxiliary leveling body 50 attached to the outer end portion of the second extension leveling plate 33 of the extended leveling body 31 so as to be rotatable in the vertical direction is provided. The auxiliary leveling body 50 can be rotated about a pivot shaft 34 provided at the outer end portion on the front side of the second extension leveling plate 33, and the second leveling plate 33 can be rotated in the deployed state. Extending outward and assisting in leveling work of the second extension leveling plate 33, and when folded (not in use), folded to the surface side of the second extension leveling plate 33 and overlapped with the second extension leveling plate 33; Become.

  The work machine body 10 and the extended work body 30 thus configured are provided with first rotation restricting means 60. The first rotation restricting means 60 includes a fixed rod 61 attached to the inner end portion of the first extension leveling plate 32 so as to be movable in the left-right direction, and a fixed rod provided at the outer end portion of the first leveling plate 15. 61 and an engaging portion (not shown) arranged opposite to each other. The fixed rod 61 is urged inward in the axial direction by the compression spring 62, and when the extension work body 30 is in a deployed state, the fixed rod 61 comes into contact with the locking portion to connect the two leveling plates (15, 32). When in the folded state, the distal end portion of the fixed rod 61 is disengaged from the locking portion, so that the connected state of the two leveling plates (15, 32) is released.

  Further, as shown in FIG. 2 (a) (rear view), the second extended leveling plate 33 and the second leveling plate 16 are rotated with respect to the first extended leveling plate 32 shown in FIG. And second rotation restricting means 70 for restricting the rotation of the auxiliary leveling body 50 with respect to the second extended leveling plate 33 is provided. The second rotation restricting means 70 is provided at the outer end of the second leveling plate 16 and the fixed rod 71 movably attached to the inner end on the front side of the second extension leveling plate 33 so as to be movable in the left-right direction. Provided at a fixing hole portion, which will be described later, disposed opposite to the fixing rod 71, an engagement pin 72 shown in FIG. 2 (b) provided at the outer end in the left-right direction of the fixing rod 71, and a tip portion of the auxiliary leveling body 50. And a hook 73 that engages with the engaging pin 72 and restricts the rotation of the auxiliary leveling body 50 in the folded state (unused state). FIG. 2B is a partial plan view of the second rotation restricting means 70 corresponding to the view taken along the line II-II in FIG.

  The outer end of the fixed rod 71 extends to the vicinity of the inside of the tip of the auxiliary leveling body 50 in the folded state (not in use), and the engaging rod 72 moves to the hook 73 by moving the fixed rod 71 in the axial direction. Engaged or disengaged. The fixed rod 71 is urged inward in the axial direction (in the direction of arrow A) by the compression spring 74, and when the extension work body 30 is in the deployed position, as shown in FIG. 3B (rear view), the compression spring The auxiliary leveling body in the folded state (unused state) by releasing the engagement state between the engagement pin 72 and the hook 73 by moving to the side away from the second leveling plate 16 against the urging force of 74. 50 rotation restrictions are canceled. Further, when the extension work body 30 is turned to the folding posture side, the fixed rod 71 moves in the direction of arrow A shown in FIG. 2A as shown in FIG. 3A (rear view). And the connection state of both the leveling boards (16, 33) is cancelled | released, and the engaging pin 72 engages with the hook 73, and controls rotation of the auxiliary leveling body 50. FIG.

  As shown in FIG. 1, when the extended working body 30 is deployed and the second leveling plate 16 and the second extended leveling plate 33 are connected, the second leveling plate 16 and the second leveling plate 16 which are connected and integrated with each other. The extended leveling plate 33 is supported by switching means (not shown) provided at the center of the machine casing 13 of the work machine body 10, and both leveling plates (16, 33) It is possible to switch to the earth work position.

  As shown in FIG. 4A (side view), the normal work posture is such that the second leveling plate 16 and the second extended leveling plate 33 that are connected to each other are integrated in the vertical direction according to the unevenness of the field. This is a rotatable scraping work posture, and in this alternative scraping work posture, the second leveling plate 16 and the second extended leveling plate 33 are substantially in a horizontal plane.

  Further, as shown in FIG. 4B (side view), the earthing work posture is fixed after the second leveling plate 16 and the second extension leveling plate 33 that are connected and integrated with each other are rotated downward. This is a working posture that can regulate the upward rotation and perform soiling and the like of the scraped soil.

  The selection of these work postures can be performed by an operator who is on the traveling machine body 90 shown in FIG. The first rotation restricting means 60 and the second rotation restricting means 70 are the same regardless of whether the integrated second leveling plate 16 and second extended leveling plate 33 are in the normal work position or the earthing work position. The operation content of these regulating means does not change.

  As shown in FIG. 5 (perspective view), the above-described fixing hole 75 is formed at the distal end portion of the fixing plate 16a provided at the outer end portion of the second leveling plate 16 and extending upward. The fixed hole 75 rotates about the rotation center axis j of the second leveling plate 16 as a rotation center, and is disposed to face the fixed rod 71 and is fitted to the fixed rod 71.

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

  First, as shown in FIG. 1, when performing a scraping operation with the maximum working width, the extension working bodies 30 on both the left and right sides are set in a deployed state, the auxiliary leveling bodies 50 on both left and right sides are set in a deployed state, and 2 Set the leveling plate 16 to the normal working posture. Then, the entire farm work machine is lowered to a desired position by the three-point link coupling mechanism, and the scraping work is performed. When the work starts, the second extension leveling plate 33 eventually turns upward by the ground pressure, and the biased fixing rod 71 is fitted into the fixing hole 75 shown in FIG. It is integrated with the main plate 16.

  In addition, when working with only the central work machine body 10 or when working with the central work machine body 10 and either the left or right extension work body 30, as shown in FIG. 6 (side view), The extension work body 30 needs to be folded. FIG. 6 is a side view showing a state in which the folding farm work machine 1 in which the extension work body 30 is folded is installed on the caster stand 80.

  In these cases, first, the auxiliary leveling body 50 is brought into the folded state (unused state), and then the extended working body 30 in the unfolded state is rotated to the folding side. When the extension working body 30 is rotated, the fixed rod 71 of the second rotation restricting means 70 shown in FIG. 3A is removed from the fixed hole 75 and the ground leveling plates (16, 33) are connected. And the engaging pin 72 engages with the hook 73 to restrict the rotation of the auxiliary leveling body 50. When the extended working body 30 is in the unfolded posture, the engaging pin 72 of the second rotation restricting means 70 shown in FIG. 3B is in a non-engaged state with the hook 73 of the auxiliary leveling body 50. The leveling body 50 is rotatable with respect to the extended leveling body 31.

  When the extended working body 30 in the unfolded state is rotated to the folding side in this way, the rotation of the auxiliary leveling body 50 in the folded state (unused state) is restricted, so that the extended working body 30 in the unfolded state is folded. Even if the auxiliary leveling body 50 is rotated to the side, the auxiliary leveling body 50 will not be exposed, and it is possible to prevent a situation in which the auxiliary leveling body 50 collides with other parts to generate noise or break them. .

  On the other hand, when the extended working body 30 in the folded state is rotated to the unfolded posture, the fixed rod 61 of the first rotation restricting means 60 is moved by the compression spring 62 as shown in FIGS. 1 and 3B. The two leveling plates (15, 32) are connected by being biased inward in the axial direction and coming into contact with the locking portion. The fixed rod 71 of the second rotation restricting means 70 moves outward in the axial direction against the urging force of the compression spring 74, and the tip of the fixed rod 71 comes into contact with the end of the second leveling plate 16. It will be in a state, and while maintaining the connection cancellation | release state of both leveling boards (16, 33), the rotation control of the auxiliary leveling body 50 is cancelled | released. As described above, when the agricultural machine starts work, the second extension leveling plate 33 is rotated upward by the ground pressure, and the urging fixed rod 71 contacts the fixed plate 16a shown in FIG. The second extended leveling plate 33 is connected to and integrated with the second leveling plate 16 by moving while contacting and fitting into the fixed hole portion 75.

  As described above, when the extension work body 30 is in the folded posture, the second rotation restricting means 70 restricts the rotation of the auxiliary leveling body 50 in conjunction with the folding operation of the extension work body 30. When the extended work body 30 is set to the deployed posture, the second rotation restricting means 70 releases the rotation restriction of the auxiliary leveling body 50 in conjunction with the folding operation of the extension work body 30. For this reason, it is possible to save time and effort for the auxiliary leveling body 50 to be restricted or released when the extension work body 30 is opened and closed.

  Further, as described above, the second rotation restricting means 70 is interlocked with the operation of the extension work body 30 regardless of the normal working posture and the earthing work posture of both the leveling plates (16, 33). 33) Regardless of the work posture of 33), the extended leveling body 31 is folded while the rotation of the auxiliary leveling body 50 in the folded state (non-use state) is restricted, or the rotation is restricted from the extended leveling body 31 in the deployed position. It is possible to unfold the auxiliary leveling body 50 in the folded state (non-use state) in which is released. In this way, when the extended working body 30 is in the deployed position, the rotation restriction of the auxiliary ground leveling body 50 in the unused state is released, so that the auxiliary leveling body 50 can be opened and closed even when the work machine body 10 is in the earthing work position. It is possible to improve the usability of the agricultural machine.

Further, the second rotation restricting means 70 includes an engaging pin 72 provided on the fixed rod 71 and a hook 73 provided on the auxiliary leveling body 50, so that the fixed rod 71 is folded into the agricultural machine 1. In the case where it is already provided, the second rotation restricting means 70 can be configured using this fixed rod . For this reason, the increase in the number of parts can be suppressed and the cost increase of the folding agricultural work machine 1 can be suppressed.

  In addition, in the Example mentioned above, the folding farm working machine 1 for shavings was demonstrated as an example, However, You may attach the auxiliary leveling body mentioned above to the folding farm working machine for tilling and crushed soil. Moreover, although the 2nd rotation control means 70 utilized the existing component, you may comprise independently. In this case, the second rotation restricting means is configured to operate in conjunction with the opening / closing operation of the extension work body 30.

The top view of the folding agricultural working machine for scraping concerning one embodiment of the present invention is shown. The 2nd rotation control means provided in this folding agricultural work machine is shown, The figure (a) is a rear view of the 2nd rotation control means, The figure (b) is II-II of the figure (a). It is a fragmentary top view of the 2nd rotation control means of the part corresponded to an arrow. The rear view for demonstrating the action | operation of a 2nd rotation control means is shown. It is a side view of a folding farm work machine, the figure (a) shows the folding farm work machine in a normal work posture, and the figure (b) shows the folding farm work machine in a soiling work posture. The perspective view of the 2nd leveling board provided with the fixed hole part is shown. The side view of the folding agricultural work machine by which the extension work body was folded is shown. The conventional folding farm work machine provided with the conventional auxiliary leveling body is shown, The figure (a) is a rear view of the folding farm work machine provided with the folded auxiliary leveling body, The figure (b) is restricted in rotation. It is a side view of the auxiliary leveling body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding agricultural work machine 10 Work machine main body 14 Leveling body 30 Extension work body 31 Extension leveling body 50 Auxiliary leveling body 70 2nd rotation control means (rotation control means )
71 fixed rod 72 Kakarigopi down 73 hook
74 Compression spring (biasing means)
75 Fixing hole

Claims (5)

A working machine main body having a cultivating body for performing a cultivating work, and a leveling body for performing a grading work by being positioned so as to be rotatable in a vertical direction at a rear position of the cultivating body;
It is provided at the end in the width direction of the work implement main body so as to be foldable and freely rotatable, and is located at the rear position of the extended cultivating body to extend the working width of the cultivating body and to be rotatable in the vertical direction. An extended working body having an extended leveling body for performing leveling work,
In the folding agricultural work machine equipped with an auxiliary leveling body rotatably at the outer end of the extended leveling body,
A rotation restricting means for restricting rotation of the auxiliary leveling body relative to the extended leveling body;
The rotation restricting means performs the rotation restriction and the rotation restriction release of the auxiliary leveling body in the unused state in conjunction with the opening / closing operation of the extension work body.   The rotation regulating means regulates the rotation of the auxiliary leveling body in an unused state when the extension work body is rotated to the side to be folded, and the auxiliary leveling in an unused state when the extension work body is in an unfolded posture. The folding agricultural work machine according to claim 1, wherein the body rotation restriction is canceled. Regardless of the normal working posture in which the leveling body and the extended leveling body can be rotated in the vertical direction according to the unevenness of the field and the state of the field by the switching unit provided in the work implement main body. Even if it is switched to any position of the earthing work position that cannot be rotated, the rotation regulation of the auxiliary ground leveling body in the unused state and the rotation regulation release are performed in conjunction with the opening / closing operation of the extension work body. The folding agricultural machine according to claim 2, wherein   The rotation restricting means rotates the extension work body to the folding posture side even when the leveling body and the extended leveling body are switched to the normal work position or the earthing work position by the switching means. Then, the folding agricultural work machine according to claim 3, wherein rotation of the auxiliary leveling body in an unused state is restricted. The rotation restricting means is movably provided in the extended leveling body so that it can be inserted into and removed from a fixed hole provided in the leveling body, and is inserted into and extracted from the fixed hole, so that A fixed rod for connecting and releasing the extended leveling body, a biasing means for biasing the fixed rod toward the leveling body, an engagement pin provided at an end of the fixed rod, and the auxiliary leveling body. A hook engageable with the engagement pin;
The rotation of the extended leveling body relative to the leveling body causes the fixed rod to move toward the leveling body side by the biasing means as the connection of the extended leveling body to the leveling body by the fixed rod is released. The folding agricultural machine according to any one of claims 1 to 4, wherein an engaging pin is locked to the hook to restrict the rotation of the auxiliary leveling body in the folded state .

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