JP6941892B2 - Mowing machine - Google Patents

Description

The present invention relates to an improvement of an agricultural machine attached to a tractor to perform mowing work.

Japanese Patent Application Laid-Open No. 2013-53 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2012-44884 (Patent Document 2) are disclosed as prior art of this type of mowing device.

Patent Document 1 provides "regulatory means for preventing the mowing work portion from rotating in the vertical direction in a direction orthogonal to the tractor traveling direction when the mowing work portion is located behind the tractor. The regulating means is activated by making the mowing work unit substantially horizontal in the offset state behind the tractor. ”The mowing work machine is disclosed. Further, Patent Document 2 states that "the two arms forming the parallel link are provided with protruding portions that project toward the other arms at different positions from each other, and at one position of the offset movement, the above-mentioned Disclosed is an "offset work machine" in which the protrusions abut against each other to serve as a stopper, and at the other position of the offset movement, the protrusions of at least one arm abut the other arm to serve as a stopper. ing.

Japanese Unexamined Patent Publication No. 2013-53 Japanese Unexamined Patent Publication No. 2012-44884

In the case of a mowing work machine that can be offset laterally from the tractor, it is possible to mow the side part where the tractor is not traveling, and the mowing work part can be rotated up and down in the direction orthogonal to the traveling direction. By doing so, it is possible to mow the portion inclined in the vertical direction on the side with respect to the tractor traveling portion. When the mowing work unit is located behind the tractor, the mowing work unit does not need to rotate, and the work is performed in a horizontal state parallel to the tractor axle. Further, when moving in the non-working state, the state where the mowing work portion is positioned horizontally behind the tractor is in the state where the balance of the center of gravity is the best. However, since the mowing work part is held by the cylinder so as to be rotatable up and down in the direction orthogonal to the traveling direction, the mowing work part rotates downward during traveling due to an internal leak of the cylinder or the like, and in the worst case. It may lead to an accident such as dragging the ground carelessly. Further, when the stand is provided on the mowing work part side when attaching / detaching to the tractor, there is a problem that it becomes difficult to attach / detach because the mounting side is not horizontal when the mowing work part side and the mounting part side are not parallel. .. Similarly, when a cylinder is used to offset the mowing work part to the side, an accident such as a collision caused by the mowing work part being offset to the side during moving and traveling due to an internal leak of the cylinder may occur. It may happen.

Therefore, an object of the present invention is to provide a mowing work machine configured at low cost so that the mowing work part does not rotate or move by an easy operation when the mowing work part is in the storage position behind the tractor. ..

In order to solve the above problems, one aspect of the present invention is to advance the mowing work portion from the rear part of the tractor by a rotating arm which is connected to the rear part of the tractor and is horizontally rotatable and provided in a pair of parallel to the left and right to form a parallel link. It can move horizontally to the side orthogonal to the direction, the mowing work part is provided on the rear end side of the rotating arm, and the mowing work part holding bracket that holds the mowing work part is on the rear end side of the rotating arm. In a mowing work machine that is connected to and can rotate the mowing work part up and down on a surface orthogonal to the tractor traveling direction around the mowing work part rotation axis provided parallel and horizontal to the traveling direction, the mowing working part Stopper means to prevent the mowing work part from rotating in the vertical direction and horizontal movement from the non-working position to the side when the is in the non-working position located behind the tractor. The stopper means is operated by setting the mowing work portion in a non-offset state and a substantially horizontal state located behind the tractor, and the stopper means is one of the pair of rotating arms provided in parallel. Mowing work by inserting a fixing pin into the overlapping part located so that the mowing work part engaging plate provided on the mowing work part side is inserted between the bifurcated rotating arm engaging plates provided on the rotating arm. configuration der to prevent the horizontal movement of the vertical rotation of the non-working position of the parts to the side is, mowing unit is pulled out of the fixing pin both are moved configurable to lateral, rotational A mowing work machine that can rotate the mowing work part up and down by moving the mowing work part sideways to a position where the overlap between the arm engaging plate and the mowing work part engaging plate is released. ..

According to the present invention, since the stopper means for preventing the mowing work part from rotating in the vertical direction and horizontally moving to the side is provided, the mowing work part moves carelessly due to a leak of a cylinder or the like. Therefore, it is possible to provide a mowing work machine that can perform safe work. Further, when the tractor is attached / detached, the attachment portion is always horizontal by the stopper means, so that the attachment / detachment can be performed satisfactorily.

It is a side view of the working state of the mowing work machine of this invention. It is a top view of the state which the mowing work part of the mowing work machine of this invention is positioned behind a tractor. It is a top view of the state in which the mowing work part of the mowing work machine of this invention is offset to the side of a tractor. It is a partial cross-sectional plan view of the state where the mowing work part is positioned behind the tractor and the stopper means is activated. It is a rear view of the main part of the stopper means for preventing the horizontal movement to the side. It is a front view of the mowing work part. It is a top view of the main part of the stopper means in a state where the rotation of the mowing work part in the vertical direction is not blocked. FIG. 5 is a plan view of a main part in a state in which a stopper means for preventing the mowing work portion from rotating in the vertical direction is activated. It is a rear view of the main part in a state where the mowing work part is inclined downward. It is a top view for demonstrating the power transmission part. It is a side view which showed the state which attached the mowing work machine to a tractor. It is a top view of the mowing work machine which showed another Example of the stopper means of this invention.

Hereinafter, examples of the present invention will be described with reference to the drawings.

The mowing work machine shown in this example is attached to a three-point link hitch mechanism provided behind the tractor 1, and is used by driving the mowing work unit 5 by the power from the tractor 1. Further, the mowing work unit 5 is provided so as to be movable to the left and right with respect to the tractor 1, and the work can be performed by locating the grass on the side of the tractor 1, and the tires of the tractor 1 step on the grass before cutting. First of all, forward cutting work is possible.

The mowing work machine of this example is provided with a mounting portion 2 for mounting on the tractor 1 in the front portion, and a mowing working portion 5 is provided behind the mounting portion 2, and the mounting portion 2 and the mowing working portion 5 are offset mechanism portions 6. It is connected via. The offset mechanism portion 6 is composed of a plan view parallel link. The front end of the parallel link is rotatably connected to the mounting portion 2 side, and the rear end side is rotatably connected to the mowing work portion 5 side, and even if the mowing work portion 5 moves left and right, the posture orthogonal to the traveling direction changes. It is configured not to.

An auto hitch device is provided in the mounting portion 2, and the hitch frame 20 is attached to a three-point link mechanism which is an elevating device provided behind the tractor 1, and the hitch frame 20 is raised by the three-point link mechanism. When the mowing work machine is lifted, the mowing work machine is automatically connected and attached. A hitch frame 20 (referred to as a quick hitch or an auto hitch, etc.) that stylizes these into a three-point link hitch mechanism consisting of a pair of left and right lower links 11 provided behind the tractor 1 and a top link 10 provided above the center thereof. When the top hook 207 above the hitch frame 20 is engaged with the top pin 210 at the upper center provided in front of the mowing work machine and the three-point link hitch mechanism is raised, the mowing work machine side The lower pins 205 provided on the lower front left and right sides are attracted to the hitch frame 20 side, engage with the U-shaped groove of the lower plate 206 of the hitch frame 20, and are prevented from coming off by the hook 208 provided in the U groove portion, so that the tractor 1 And the mowing work machine are connected.

The mowing work unit 5 is provided with a bevel gear case 3 which is a power input unit provided in an upper portion on one side of the mowing work unit 5, and as shown in FIG. 10, the mowing work unit 5 projects forward from the bevel gear case 3. The provided second input shaft 30 and the first input shaft 212 provided on the mounting portion 2 are connected by a universal joint 65 that can expand and contract in the axial direction, and further, the front side of the first input shaft 212 is connected to the tractor PTO shaft 13. It is connected by a universal joint 12, power is taken out from the tractor 1, and the mowing work unit 5 is driven. The second input shaft 30 and the first input shaft 212 provided on the mounting portion 2 are connected by a universal joint 65 that can expand and contract in the axial direction, so that the second input shaft 30 and the mowing work portion 5 are provided in parallel. It absorbs the amount of displacement between the cores when the offset mechanism unit 6 composed of links rotates.

The bevel gear case 3 is provided so as to project outward from the cutting blade 51 at the outermost end of the mowing work portion 5, and the bevel gear case 3 uses the internal bevel gear 31 to transmit the power input to the second input shaft 30. The speed is changed and changed in the direction orthogonal to the second input shaft 30. The converted power is transmitted from one side of the bevel gear case 3 to the side end side of the mowing work portion 5 by the horizontal output shaft 32. An output pulley 33 is fixed to the tip of the output shaft 32 on the side end side, and an input pulley 57 fixed to the end of the rotating shaft 50 of the mowing work portion 5 is provided below the output pulley 33. The power input to the second input shaft 30 by the transmission belts hung on these pulleys is transmitted to the rotary shaft 50 of the mowing work unit 5 to drive the rotation. The pulley and the transmission belt portion are covered and guarded by the belt cover 4.

The mowing work unit 5 has a mowing rotor 56 in which a plurality of mowing blades 51 are radially provided on a rotating shaft 50 in the horizontal direction orthogonal to the traveling direction of the tractor, and the upper part of the rotating shaft 50 is mowed. Rotate it so that it scoops up from the front to the rear so that the grass can pass through, and mow and crush weeds. The upper part of the outer circumference of the cutting blade 51 rotation locus is covered with a cutting part cover 52 to prevent the cut weeds from scattering and to carry a part of the cut weeds around the rotation shaft 50. It is provided to be crushed even more finely. Both ends of the rotating shaft 50 are held by side plates 55, which are covers on the left and right sides of the cutting portion cover 52, via bearings 550.

The front end of the cutting portion cover 52 projects forward from the cutting rotor 56, and is bent in the vertical direction downward from the horizontal plane that continuously protrudes from the front of the cutting portion cover 52 and the reverse. It forms an L-shaped portion. A large number of flaps 520 are hung in the width direction of the mowing work portion 5 at the inverted L-shaped lower end portion, and are provided so that foreign matter or the like bounced off by the mowing rotor 56 does not jump out. ..

A gauge roller 7 is provided at the lower rear portion of the mowing work portion 5 and is in contact with the ground surface during work to maintain the ground clearance on the rear side of the mowing work portion 5. The gauge roller 7 is provided in a cylindrical shape having a length substantially the width of the cutting rotor 56, and the left and right ends rotate via bearings 72 on the mounting plates 70 extending rearward from the left and right side plates 55 of the mowing work portion 5. It is held freely. A plurality of mounting holes for the mounting plate 70 are provided on the side plate 55, and the height of the mowing work portion 5 is adjusted by selecting and mounting the mounting hole positions.

The offset mechanism portion 6 for moving the mowing work portion 5 to the left and right has a rotating arm 60 whose front end side is horizontally rotatably connected to the mounting portion 2 and extends to the rear side, and one end is rotated to the mounting portion side and the other end is rotated. An offset electric cylinder 63 that is horizontally rotatably connected to the moving arm 60 side and rotates the rotating arm 60 in the horizontal direction by its expansion and contraction operation, and a mowing work portion 5 on the rotating end side of the rotating arm 60. The mowing work part holding bracket 64 is provided, and the rotating arms 60 are provided in parallel on the left and right sides, and the front end is on the mounting part 2 side and the rear end side is on the mowing work part holding bracket 64 on the mowing work part 5 side. A parallel link is formed by connecting the forward rotation shaft 61 and the rear rotation shaft 62 provided in the vertical direction, respectively, and the mowing work portion 5 is a tractor 1 shown in FIG. 3 from the rear position of the tractor 1 shown in FIG. It is configured so that the orthogonal posture of the cutting work portion does not change with respect to the traveling direction even if the left and right movements are performed to both sides. Since it is composed of an offset mechanism using parallel links, the structure is simple and it is possible to keep the manufacturing cost low.

The mowing work portion holding bracket 64 is held horizontally rotatably by forming a parallel link mechanism by a rear rotation shaft 62 in the direction perpendicular to the rotation end side of the rotation arm 60, and is parallel to the traveling direction. The mowing work portion rotating shaft 53 provided horizontally holds the mowing work portion 5 so as to be rotatable in the vertical direction on a surface perpendicular to the traveling direction. An electric cylinder 54 for rotating the mowing work part is connected to the mowing work part 5 side and the mowing work part holding bracket 64 side so that both ends can be rotated, and the electric cylinder 54 for rotating the mowing work part is expanded and contracted. , A rotation mechanism unit that rotates the mowing work unit 5 up and down about the mowing work unit rotation shaft 53 is configured. By rotating the mowing work unit 5 up and down, weeds and the like on an inclined surface inclined up and down on the side with respect to the traveling surface of the tractor 1 can be mowed.

The connection with the mounting portion 2 on the front end side of the offset mechanism portion 6 is connected to the lower portion of the mast frame 202 on the left and right sides of the mounting portion 2 via the connecting bracket 203, and is connected to the rear side of the connecting bracket 203. The moving arm 60 is held by a forward rotating shaft 61 provided in the vertical direction, and one end of the connecting bracket 203 on the front side is rotatably connected to the mast frame 202 by a horizontal vertical rotating shaft orthogonal to the traveling direction. doing. This front-back rotation angle is regulated within a certain range, but this allows the mowing work part 5 to swing back and forth within a certain range with respect to the mounting part 2 so that it can follow the unevenness of the work field during work. Has been done.

3 to 8 show a stopper means for preventing the rotation of the mowing work portion 5 of this example and the horizontal movement to the side. 4 and 8 show a state in which the mowing work portion 5 is located behind the tractor, and the vertical rotation stopper plate 80 is fitted into the U-shaped notch portion 580 of the holding bracket side rotation link arm 58. 3 and 7 show a state in which the vertical rotation stopper plate 80 is separated from the holding bracket side rotation link arm 58 in a state where the mowing work portion 5 is offset.

The vertical rotation of the mowing work portion 5 is rotated around the mowing work portion rotation shaft 53, which is a horizontal axis parallel to the traveling direction provided in the mowing work portion holding bracket 64. The rotation is rotated up and down by the expansion and contraction of the electric cylinder 54 for rotating the mowing work unit, which is bridged between the mowing work unit 5 and the mowing work unit holding bracket 64.

The electric cylinder 54 for rotating the mowing work portion is rotatably attached to a mounting bracket whose one end is fixed to the upper surface of the mowing portion cover 52 of the mowing work portion 5 by a rotation shaft parallel to the traveling direction, and the other end is rotatably attached. The rotating link arm 58 is connected to two rotating link arms, and one end of the rotating link arm is rotatably attached to the mowing work portion holding bracket 64 by a rotating shaft parallel to the traveling direction. And the work part side rotation link arm 59 rotatably attached to the mounting bracket whose one end is fixed to the upper surface of the mowing part cover 52 of the mowing work part 5 by a rotation axis parallel to the traveling direction. It is rotatably connected to the other end by the same axis. As shown in FIG. 6, in the front view of the mowing work portion 5, the holding bracket side rotation link arm 58 and the work portion side rotation link arm 59 have a connecting portion with the mowing work portion rotation electric cylinder 54 as the apex. It is arranged in a triangular shape and has a link configuration in which the mowing work portion rotation shaft 53 is arranged near the bottom portion. When the electric cylinder 54 for rotating the mowing work portion is extended, the mowing work portion 5 rotates downward. , When contracted, it rotates upward.

In this example, the front side of the electric cylinder 54 for rotating the mowing work part is covered with a cylinder cover 540, and the holding bracket side rotation link arm 58, the work part side rotation link arm 59, and the mowing work part rotation The connecting portion with the electric cylinder 54 is exposed to the front side from a long hole provided in the cylinder cover 540 in the expansion / contraction direction of the mowing work part rotating electric cylinder 54, and the mowing work part rotating electric cylinder is exposed from the tractor driver's seat. The structure is such that the length of 54, that is, the rotation angle of the grass cutting work portion 5 corresponding thereto can be confirmed by the scale 541 provided in the upper portion of the elongated hole.

The stopper means for preventing the mowing work portion 5 from rotating in the vertical direction is such that the mowing work portion 5 is horizontal to the lower end edge of the holding bracket side rotation link arm 58 on the mowing work portion rotation shaft 53 side. When in the position, a U-shaped notch 580 that opens toward the rotation end side of the mowing work portion 5 is provided, and the notch 580 is provided with a vertical rotation stopper provided on the rotation arm 60. The plate 80 is fitted so as to prevent the mowing work portion 5 from rotating up and down.

The vertical rotation stopper plate 80 is provided so as to project from one of the rotation arms 60 on the side approaching the mowing work portion 5 when the mowing work portion 5 is located behind the tractor, and in this example, the vertical rotation stopper plate 80 is provided. A flat strip is extended in a shape from the upper surface of the rotating arm 60 toward the U-shaped notch 580, and the end portion is a horizontal plane parallel to the upper surface of the rotating arm 60. When the mowing work portion 5 is horizontal, the end portion is fitted into the U-shaped notch portion 580 of the holding bracket side rotating link arm 58. A plate-shaped reinforcing member is firmly fixed to the lower portion of the strip-shaped member of the flat plate in a T-shaped cross section.

When the mowing work portion 5 is horizontal and is in the non-working position behind the tractor 1, the vertical rotation stopper plate 80 is fitted into the U-shaped notch 580 to rotate the holding bracket side rotation link arm 58. Fix it. When the mowing work portion 5 moves from the rear position of the tractor 1 in the offset direction, the vertical rotation stopper plate 80 is disengaged from the U-shaped notch portion 580 of the holding bracket side rotation link arm 58, and the mowing work is performed. The portion 5 can be rotated in the vertical direction. The fitting of the vertical rotation stopper plate 80 provided on the rotation arm 60 and the mowing work portion 5 side is not limited to the U-shaped notch portion 580 of the holding bracket side rotation link arm 58. However, it may be any one provided on the mowing work portion 5 side and fitted to prevent rotation. Further, the rotation blocking direction may be only the descending direction.

In FIGS. 4 and 5, a stopper means for preventing the horizontal movement of the mowing work portion 5 to the side will be described. FIG. 4 shows a state in which the mowing work portion 5 is located behind the tractor, and the vertical rotation stopper plate 80 is fitted into the U-shaped notch portion 580 of the holding bracket side rotation link arm 58 to form the mowing work portion 5. It is in a state where vertical rotation is blocked. Then, as shown in FIG. 5, a left engaging plate 811 and a right engaging plate 812 in the horizontal direction projecting toward the mutual rotating arms are formed on the facing surfaces of the rotating arms 60 and 60, respectively. Each plate is fixed so that the holes in the vertical direction overlap each other in a position where the vertical rotation of the mowing work portion 5 is prevented. By inserting the fixing pin 810 into this hole, the rotation of the rotating arms 60 and 60 in the horizontal direction is prevented.

That is, when the mowing work portion 5 is horizontal and in a non-working position behind the tractor 1, the fixing pin 810 is inserted into the holes of the left engaging plate 811 and the right engaging plate 812 to rotate the mowing working portion 5. And the horizontal movement to the side is blocked. In this state, it is possible to prevent the mowing work portion from inadvertently rotating downward or moving sideways during traveling due to an internal leak of the electric cylinder 54 for rotating the mowing work portion or the electric cylinder 63 for offsetting.

FIG. 9 is a rear view of a main part of the mowing work machine of this example in a state where the mowing work part 5 is offset and tilted, and the universal joint 65 part is omitted. By offsetting the mowing work portion 5 as shown in FIG. 9, the mowing work of the lateral portion where the tractor is inclined in the horizontal state becomes possible. Although this figure shows the case where it is tilted downward, the same work can be performed even when it is tilted upward. In the state where the mowing work portion 5 was offset, the vertical rotation stopper plate 80 was disengaged, and the engagement fixing pin 810 of the left engagement plate 811 and the right engagement plate 812 of the rotation arm 60 was disengaged. It becomes a state.

FIG. 12 shows the stopper means 8'of another embodiment. When the mowing work portion 5 is horizontal and in a non-working position behind the tractor 1, the stopper means 8'is a plate-shaped rotating arm engaging plate 813 projecting horizontally from one rotating arm 60 and mowing. A through hole in the vertical direction is provided in the overlapping portion of the plate-shaped mowing working portion engaging plate 814 projecting horizontally from the working portion 5, and the fixing pin 810'is inserted and fixed. The rotating arm engaging plate 813 is provided on the upper and lower bifurcated surfaces, and the mowing work portion engaging plate 814 is positioned so as to enter between the bifurcated shapes. With this configuration, the mowing work portion 5 is prevented from rotating downward and moving laterally. When the fixing pin 810'is pulled out and the mowing work part 5 is moved sideways to the position where the polymerization of the rotating arm engaging plate 813 and the mowing work part engaging plate 814 is released, the mowing work part 5 is rotated up and down so that the mowing work can be performed. And horizontal movement is possible.

Next, the operation of the mowing work machine of the present invention will be described. It is mounted on the tractor 1 by the mounting portion 2 provided in the front portion of the mowing work machine, the first input shaft 212 of the mounting portion 2 and the tractor PTO shaft 13 are connected by a universal joint 12 and rotationally driven by the power from the tractor 1. .. At this time, in the case of connection by an auto hitch device, as shown in FIG. 11, these are standardized in a three-point link hitch mechanism including a pair of left and right lower links 11 of the tractor 1 and a top link 10 provided above the center thereof. When the hitch frame 20 is attached and the top hook 207 above the hitch frame 20 is engaged with the top pin 210 at the upper center provided in front of the mowing work machine and the three-point link hitch mechanism is raised, the mowing work machine is used. The lower pins 205 provided on the front lower left and right sides are attracted to the hitch frame 20 side, engage with the U-shaped groove of the lower plate 206 of the hitch frame 20, and are prevented from coming off by the hook 208 provided in the U groove portion. The tractor 1 and the mowing work machine are connected. In the case of this example, the universal joint 12 is also connected at the same time when they are connected. If the electric cylinder 54 for rotating the mowing work portion expands and contracts due to an internal leak or the like during this mounting, the mast frame 202 cannot be mounted because the mast frame 202 is held by the stand 9. Although there is a risk, it can be easily mounted because the rotation is blocked by the stopper means 8 of the present invention. A mowing work machine is attached, and after moving to the work field, the work can be performed by removing the fixing pin 810 of the rotating arm 60 part.

The input power is transmitted from the universal joint 12 to the second input shaft 30 of the bevel gear case 3 via the first input shaft 212 of the mounting portion 2 and the universal joint 65. The power of the second input shaft 30 is transmitted to the side end side of the mowing work portion 5 by the output shaft 32 by the bevel gear 31 inside the bevel gear case 3. An output pulley 33 is fixed to the tip of the output shaft 32, and an input pulley 57 fixed to the end of the rotating shaft 50 of the mowing work portion 5 is provided below the output pulley 33, and is hung on these pulleys. Power is transmitted to the rotary shaft 50 of the mowing work unit 5 by the transmission belt and is driven to rotate. A plurality of cutting blades 51 are provided on the rotating shaft 50 so as to swing freely, and weeds and the like cut from the cutting blades are rotated so as to pass above the rotating shaft 50 and scoop up from the front to the rear. Weeds are cut and crushed as the tractor progresses. The upper part of the outer circumference of the cutting blade 51 rotation locus is covered with the cutting part cover 52 to prevent the cut weeds from scattering and to rotate a part of the cut weeds by the action of the scooping surface of the cutting blade 51. Rotate it around the shaft 50 to crush it into smaller pieces.

The mowing work unit 5 moves left and right by expanding and contracting the offset electric cylinder 63 of the offset mechanism unit 6 with respect to the mounting unit 2 to adjust the offset position from the tractor 1 and perform the work. By offsetting the mowing work part 5 from the side of the tire of the tractor 1 to the outside, the tractor 1 runs on the field surface after cutting, and the mowing work part 5 is positioned in the uncut part to perform the work. However, it is possible to prevent the occurrence of uncut parts due to trampling on weeds in unworked areas.

By offsetting the mowing work portion 5 outward from the tire side of the tractor 1, and further expanding and contracting the electric cylinder 54 for rotating the mowing portion, the mowing work portion 5 is rotated up and down in a direction orthogonal to the traveling direction. It is possible to mow the slope of the side surface that is inclined up and down with respect to the traveling surface of the tractor 1. The mowing work unit 5 is moved and rotated by a control box provided near the driver's seat.

When the mowing work is completed, the mowing work unit 5 is leveled and moved to the rear of the tractor 1, and at this time, the vertical rotation stopper plate which is a stopper means for preventing the mowing work unit 5 from rotating in the vertical direction. By fitting the 80 into the U-shaped notch 580 of the rotating link arm 58 on the holding bracket side and inserting the fixing pin 810 into the engaging plate of the rotating arm 60, the mowing work portion 5 is made of the tractor 1. It can be in a horizontal state parallel to the axle. Further, in the case of moving traveling, since the mowing work portion 5 is held by the vertical rotation stopper plate 80 and the fixing pin 810, the mowing portion 5 is mowed during traveling due to an internal leak of the cutting portion rotating electric cylinder 54 or the offset electric cylinder 63. It is safe because the working unit 5 does not rotate downward or slide sideways carelessly. Further, when the stand 9 is provided on the mowing work portion 5 side when attaching / detaching to / from the tractor by the quick hitch, the stopper means 8 is activated so that the mounting portion 2 side is always horizontal and the attachment / detachment by the quick hitch is good. Can be done.

INDUSTRIAL APPLICABILITY The present invention can be used for an agricultural machine mounted behind a tractor, which is a traveling machine, for mowing work.

1 tractor 10 top link 11 lower link 12 universal joint 13 tractor PTO shaft 2 mounting part 20 hitch frame 200 lower link pin 201 top link pin 202 mast frame 203 connecting bracket 205 lower pin 206 lower plate 207 top hook 208 hook 210 top pin 212 1 Input shaft 3 Bevel gear case 30 2nd input shaft 31 Bevel gear 32 Output shaft 4 Belt cover 5 Mowing work part 50 Rotating shaft 51 Mowing blade 52 Mowing part cover 53 Mowing work part Rotating shaft 54 Mowing work part rotating electric cylinder 540 Cylinder Cover 541 Scale 55 Side plate 550 Bearing 56 Mowing rotor 57 Input pulley 58 Holding bracket side rotating link arm 580 Notch 59 Working part side rotating link arm 6 Offset mechanism part 60 Rotating arm 61 Forward rotating shaft 62 Rear rotation Moving shaft 63 Offset electric cylinder 64 Mowing work part holding bracket 65 Universal joint 7 Gauge roller 70 Mounting plate 8 Stopper means 80 Vertical rotation stopper plate 81 Horizontal movement stopper 810 Fixing pin 811 Left engaging plate 812 Right engaging plate

Claims (1)

The mowing work part can be horizontally moved from the rear part of the tractor to the side orthogonal to the traveling direction by the rotating arm which is connected to the rear part of the tractor and is horizontally rotatably provided in a pair parallel to the left and right to form a parallel link. The mowing work portion is provided on the rear end side of the rotating arm, and the mowing work portion holding bracket for holding the mowing work portion is connected to the rear end side of the rotating arm, and is parallel to the traveling direction. In a mowing work machine that can rotate the mowing work part up and down the plane perpendicular to the tractor traveling direction around the horizontal rotation axis of the mowing work part.
When the mowing work part is in a non-working position located behind the tractor, the surface of the mowing work part that is orthogonal to the tractor traveling direction is prevented from rotating in the vertical direction and horizontally moving from the non-working position to the side. The stopper means is provided for the purpose, and the stopper means is operated by putting the mowing work portion in a non-offset state and a substantially horizontal state located behind the tractor.
The stopper means is a mowing work portion engaging plate provided on the mowing working portion side between the bifurcated rotating arm engaging plates provided on one of the pair of rotating arms provided in parallel. the polymerization unit which is positioned so as to enter the, Ri configuration der to prevent horizontal movement and vertical pivoting of laterally from the non-working position of the mowing unit by inserting the fixing pin,
The mowing work portion is configured to be movable laterally when the fixing pin is pulled out, and the mowing work is performed until the position where the polymerization of the rotating arm engaging plate and the mowing working portion engaging plate is released. A mowing work machine characterized in that the mowing work part can be rotated up and down by moving the part to the side.

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