JPH044483Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tractor-pulled harvesting machine in which a harvesting device equipped with a ground contact wheel at the rear of the digging tool is connected to the rear of the tractor via a three-point linkage device.

Conventionally, in such a tractor-pulled harvester,
The height of the digging tool can be adjusted by vertically adjusting the mounting position of the grounding wheel relative to the harvesting device. There was the trouble of having to adjust the mounting position of the wheel, and there was room for improvement.

In order to solve such problems in the prior art, for example, the top link of the three-point link connecting the harvesting device to the tractor is configured to be telescopically adjustable, and the length of the top link can be adjusted by turning rearward from the operating position. It is not unthinkable to construct a structure in which the digging tool attachment part can be swung up and down around the ground wheel by adjusting the height, but in this case, it would be necessary to connect it to the rear end of the machine as an essential part of the tractor. The presence of the lift arm, which is attached to the lift arm, tends to impede adjustment of the top link connected in the vicinity of the lift arm.

Since a space is formed at the rear of the tractor body for the vertical swing of the digging tool, the overall length of the harvester when connected is long, making it difficult to make small turns at the edge of the field.

New problems arise as shown above.

The present invention allows the height of the digging tool to be adjusted while riding on the tractor, the adjustment operation is not hindered by the lift arm, and it is easy to perform the adjustment operation, and the overall length is minimized to make it easier to turn. The objective is to provide a tractor-pulled harvester.

The technical means of the present invention for achieving the above object is a tractor-pulled harvester in which a harvesting device equipped with a ground contact wheel at the rear of the digging tool is connected to the rear of the tractor via a three-point linkage device. , is provided with the configurations described in [A] to [D] below.

[A] Of the top link and lower link constituting the three-point link, the top link is configured to be expandable and contractible.

[B] The top link includes an extension frame provided near the back of the operator's seat of the tractor and protruding above a lift arm connected to the rear end of the tractor, and an extension frame of the harvesting device. It is constructed near the front end of the upper part.

[C] The harvesting device includes the digging tool below the front end thereof, and the grounding ring is located toward the rear of the device and away from the connection point with the top link.

[D] The harvesting device is in a state in which its digging tool overlaps the rear wheels of the tractor in the front and back direction,
It is connected to the tractor.

The effects of taking the above technical measures are as follows.

In other words, the length of the top link is adjustable, and the end on the tractor connection side is connected to an extension frame that protrudes above the lift arm, so you can easily adjust the lift arm while riding on the tractor body. The top link can be adjusted easily without being hindered by the presence of the top link.

In addition, by raising the connection point of the top link with respect to the ground through the extension frame, the amount of swing of the entire harvesting device centered around the grounding point of the grounding ring is reduced relative to the amount of expansion and contraction of the top link. This makes it easy to finely adjust the height of the digging tool even if the top link is expanded and contracted to a relatively large extent. In other words, if we consider the connection point with the top link on an arc with the grounding point of the grounding ring as the center of rotation, the upward movement component is larger in the arc closer to the ground, but the top link is as far away from the ground as possible. By being located far above, the top link expands and contracts while the connection point with the top link moves along the arc of the portion where the horizontal component is larger than that near the ground. Therefore, whether the height of the excavation tool is finely adjusted or relatively roughly adjusted, it is easy to make the desired adjustment. It is easy to make adjustments.

Furthermore, since the harvesting device has the digging tool at the front end connected to the rear wheel of the tractor in such a manner that it overlaps with the rear wheel of the tractor, the distance from the grounding point to the digging tool is made sufficiently long to prevent rocking around the grounding point. This has the advantage that the length of the entire harvest including the tractor can be shortened while minimizing changes in the posture of the digging tool due to movement, and a harvester capable of making small turns can be obtained.

Embodiments of the present invention will be described below based on the drawings.

A pair of left and right lift arms 4 are connected to the rear end of the tractor T, which has left and right front wheels 1 and left and right rear wheels 2, and a driver's seat 3 located between the left and right rear wheels 2, by means of a single-acting hydraulic cylinder 22. The onion harvesting device S is movably connected to the rear of the tractor T via a three-point link device 5 consisting of a pair of left and right lower links 5a and a top link 5b, and is movably connected to the rear of the tractor T. The lift arms 4 are separately connected to the left and right lower links 5a via lift rods 6 to form a tractor-pulled onion harvester.

The onion harvesting device S includes a rake-shaped blade 7 as a digging tool for digging up onions, a conveyor 8 for lifting and conveying the dug-up onions upward to the rear side, and a terminal end thereof. A sorting device 9 that sorts onions dropped from the machine into a plurality of locations in the width direction of the machine, and a plurality of pairs of left and right rollers 10a that align the onions supplied from the sorting device 9 in an inverted state as they are transported. A device 10 is provided with a disk-shaped cutter 11 for cutting the drooping stems and leaves of onions whose postures are aligned, and as the tractor T advances, the onions in the field are dug up and processed. At the same time, the system is configured to automatically and continuously perform the work of cutting the stems and leaves and sequentially releasing them into the field. Note that the symbol En in the figure is an engine for driving the harvesting device.

The sorting device 9 is constructed by placing a plurality of sorting rollers 13 in the onion receiving hopper 12 at appropriate intervals in the width direction of the machine, and sorting the onions into the pair of onions. Plate-like bodies 14 are provided connected to the lower part of the sorting rollers 13 for guiding each of the plurality of posture alignment rollers 10a in a divided state. However, the reference numeral 15 in the figure is a roller located at the upper part of the front end of the hopper 12, and is provided to prevent onions from falling toward the tractor.
Further, reference numeral 16 is a partition plate for maintaining the divided state located at the upper part of the starting end side of the posture alignment roller 10a, and 17 is a partition plate that provides resistance to the movement of the onions so that a plurality of onions can be arranged vertically. It is a rubber film-like body that prevents the material from overlapping.

Located at the rear of the rake-shaped blade body 7,
A pair of left and right wheels 18 are provided as ground supports,
The top link 5b is provided with a turnbuckle mechanism 19 for adjusting expansion and contraction, and the top link 5b is
The tractor side end of b is connected to the protruding side end of an extension frame 21 bolted to the top link connecting bracket 20 attached to the tractor T in a state of projecting upward, and then by adjusting the extension and contraction of the top link 5b. The harvesting device S is structured so that the height of the rake-shaped blade body 7 can be changed and adjusted by swinging the harvesting device S up and down about the wheels 18, and the top link 5b is positioned upward when riding on the tractor T. The structure is such that the top link 5b can be expanded and contracted while the top link 5b remains in place. However, the reference numeral 19a in the figure is a rod-shaped handle for operating the turnbuckle.

Further, the harvesting device S has a rake-like blade 7
is connected to the tractor T so as to overlap the rear wheel 2 of the tractor T in the longitudinal direction, and a pair of left and right wheels 18 are provided far away from the rake-shaped blade body 7.

Next, the operating principle of the adjustment operation of the onion harvesting device S according to the present invention will be explained based on the operation explanatory diagram of FIG. 4.

[1] Overall configuration In Fig. 4, reference numeral 5a is a lower link, 5b is a top link, 7 is a digging tool, and 18 is a grounding ring, and the connecting points of each link are indicated by symbols A, B, and B, respectively.
A lift rod 6 of a lift arm 4 is connected at a connecting point E to an intermediate position of the lower link 5a. In addition, top link 5b
When adjusting the expansion and contraction, the lift arm 4 is used in a free state.

[2] When the top link is extended (in the direction of arrow A) The connection point B between the top link 5b and the working machine is centered on the axis 0 of the grounding wheel 18, and corresponds to the distance between B and 0. It moves on radius R1 and attempts to move to point b'. However, Toplink 5b
As the grounding wheel 18 expands, an operating force is applied to the connecting point D between the lower link 5a and the working machine to rotate it clockwise around the connecting point D.
If the axis 0 of moves clockwise on an arc R3 centering on the connection point D by the same angle as the swing angle α of the connection point B, and the connection point D remains stationary, then the temporary axis 01 will reach.

However, when the grounding ring 18 is located at the tentative axis 01 position, the lower part of the grounding ring 18 is buried below the ground level GL as shown by the dashed line circle. Axial center 0
moves in the direction of arrow 2 in the figure, and reaches an axis 0' on a vertical line that passes approximately through the temporary axis 01. Along with this, the connection points D and B are also moved slightly upward, reaching B' and D', respectively.

At this time, point B' is a new arc R1' whose rotation center is the new axis 0' and whose radius is the distance from the axis 0 to the connecting point B, and the tip of the extended top link 5b. It is located at the intersection with the rotation locus of . Also, the new connection point D' is an arc r' whose center point is 0' among the arcs r, r', r'' whose radius is the distance between the connection point D and the axis 0. And an arc R whose radius is the distance between C and D of the lower link 5a
2, the connection point D between the lower link 5a and the work machine
moves slightly in the direction of arrow B, and arc r′ and arc R2
It will be located at the intersection of

In this way, as a result of the top link 5b being extended, the entire work machine is connected to the line segment 0, D connecting the axis 0 at the original position of the grounding machine 18 and the connection point D, and the axis at the new position. The digging tool 7 is rotated clockwise by the intersection angle θ1 between the line segments 0' and D' connecting the core 0' and the new connection point D', and the digging tool 7 is moved from the level L in the direction of the arrow C. Reach level L′.

[3] When the top link is contracted (arrow A' direction) The connection point B between the top link 5b and the working machine is centered on the axis 0 of the grounding wheel 18, and corresponds to the distance between B and 0. The top link 5b moves on the radius R1 and tries to move to the b'' point side.
With the contraction of the ground contact wheel 1, an operating force is applied to the connection point D between the lower link 5a and the working machine to rotate it counterclockwise around the connection point D.
The axis 0 of 8 is a circular arc R3 whose center is the connection point D.
It moves counterclockwise on the top by the same angle as the swing angle β of the connection point B, and if the connection point D is immovable, it reaches the temporary axis 02.

However, the fact that the grounding ring 18 is at the tentative axis 02 position means that the grounding ring 18 is raised above the ground level GL as shown by the two-dot chain line circle, so in reality, the axis 0 moves in the direction of arrow N' in the figure, and almost reaches the axis 0'' on the vertical line passing through the tentative axis 02. Along with this, the connecting points D and B also move slightly downward. are shifted to reach B″ and D″ respectively.

At this time, point B'' is a new arc R1'' whose rotation center is the new axis 0'' and whose radius is the distance from the axis 0 to the connection point B, and the tip of the extended top link 5b. The new connection point D'' is located at the intersection with the rotation locus of An arc r'' whose center point is ``, and an arc R whose radius is the distance between C and D of the lower link 5a.
2, the connection point D between the lower link 5a and the work machine
moves in the direction of arrow R' and is located at the intersection of arc r'' and arc R2.

In this way, as a result of the top link 5b being extended, the entire work machine is connected to the line segment 0, D connecting the axis 0 at the original position of the ground contact wheel 18 and the connection point D, and the axis at the new position. The digging tool 7 rotates counterclockwise by the intersection angle θ2 between the line segments 0″ and D″ connecting the core 0″ and the new connection point D″, and the digging tool 7 moves from the level L to the arrow H′.
Move in the direction and reach level L″.

In addition, the present invention connects the onion harvesting device S, as well as a potato harvesting device, a digging machine for various crops, and
Suitable for connecting various harvesting devices such as forage harvesters. When the wheels 18 are provided, they may be in either an idle state or a driven state.

[Brief explanation of the drawing]

The drawings show an embodiment of the tractor-pulled harvester according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a cutaway side view of the sorting device attachment part, Fig. 3 is a schematic rear view of the same part, and Fig. 3 is a schematic rear view of the same part. FIG. 4 is a schematic explanatory diagram showing the operating state of the harvesting device. 3... Pilot seat, 5... Three-point linkage device, 5a
...Lower link, 5b...Top link, 7...
... Digging tool, 18 ... Ground wheel, 19 ... Turnbuckle mechanism, 21 ... Extension frame, T ... Tractor, S ... Harvesting device.

Claims (1)

[Claims for Utility Model Registration] 1. A harvesting device S equipped with a grounding wheel 18 at the rear of the digging tool 7 is connected to the rear of the tractor T via a three-point link device 5, and the following [A] A tractor-pulled harvester having the configuration described in ~[d]. [A] Of the top link 5b and lower link 5a constituting the three-point link 5, the top link 5b is configured to be expandable and contractible. [B] The top link 5b is attached to a tractor T.
near the back of the control seat 3 of the tractor T.
An extension frame 2 provided in a state that protrudes upward from the lift arm 4 connected to the rear end.
1 and near the upper front end of the harvesting device S. [C] The harvesting device S is equipped with the digging tool 7 below the front end thereof, and the grounding ring 18 is located near the rear of the device, away from the connection point with the top link 5b.
has been established. [d] The harvesting device S is connected to the tractor T in such a manner that its digging tool 7 overlaps the rear wheels 2 of the tractor T in the longitudinal direction. 2. The tractor-pulled harvester according to claim 1, wherein the top link 5b is provided with a turnbuckle mechanism 19 as an expansion/contraction adjustment means.