JPS6222566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combine harvester in which a threshing section is mounted on a traveling device so that it can be driven up and down.

Considering a wet field combine harvester in which a threshing section equipped with a pre-harvesting processing section is mounted on a crawler traveling device so that it can be raised and lowered by driving, this combine harvester has a structure in which the grain culm is transferred from the pre-harvesting processing section to the threshing device. The ground level of the threshing section can be changed to adjust the cutting height according to the sinking of the traveling device while keeping it constant, and the reaping and threshing work can be performed stably.

However, when the threshing section is lifted from the traveling device in this way, the center of gravity of the machine becomes high, and the machine tends to tilt outward when turning, resulting in a lack of stability and, in some cases, a high risk of tipping over. Moreover, the operability was poor because the threshing section was lowered each time the turning operation was performed.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to make it possible to perform cornering safely with good operability through simple improvements.

Next, embodiments of the present invention will be described in detail based on the drawings.

A vehicle body 2 equipped with left and right crawler traveling devices 1,
A base 4 is attached via parallel links 3, 3 that are swingable around the horizontal axis, and the base 4 is raised relative to the vehicle body 2 by linking the vehicle body 2 and the base 4. A parallel quadruple link mechanism A is configured to move the base 4 parallel to the front and move the base 4 backward parallel to the vehicle body 2 as the base 4 is lowered.
Fluid pressure cylinders 5, 5 for driving and lowering the base 4 are pivotally connected via a horizontal shaft on both sides of the vehicle body and across the vehicle body 2 and the base 4, and are used to raise and lower the planted grain culm. A grain department consisting of a reaping pre-processing section B equipped with a device 6, a reaping device 7, and a reaped grain culm conveying device 8, and a threshing device 10 equipped with a feed chain 9 that takes over and pinches and conveys the reaped grain culm. C,
and the driving section 11 are integrally attached to the base 4, and the cutting height can be adjusted while keeping the grain culm delivery posture from the reaping pretreatment section B to the threshing feed chain 9 constant. This is a combine harvester for wet fields that can be used for wet fields.

To configure the drive structure for the base 4 on which the threshing section C is attached, as shown in FIG. are connected in parallel flow paths, and each of the parallel flow paths is provided with flow path switching valves V, V of a neutral position self-holding type, and manually operated levers 13, 13 are interlocked with the valves V, V, respectively. connect,
A solenoid S is provided in each of the valves V, V to electrically switch the port a to lower the base 4 under its own weight, and a steering lever is provided to individually stop the clutch brakes 16 for the left and right traveling devices 1. 14, 14 is linked to a switch _S1 that closes when the lever 14 is in the stop position,
The switches S ₁ and S ₁ are connected in parallel, the solenoids S and S are connected in parallel, and these are connected in series to the battery 15.

That is, in a state in which the threshing section C can be manually driven up and down with respect to the traveling device 1, and the threshing section C is positioned higher than the set seating position on the traveling vehicle body 2 by the manual operation, either When the steering lever 14 is turned to the stop position, the threshing section C is automatically lowered to the set position as the turning steering operation is performed, and the solenoids S, S and switches S ₁ and S ₁ constitute an automatic lowering control mechanism D for the threshing section C during turning.

FIG. 3 shows a first modification of the main body drive structure,
The automatic lowering control mechanism D in the first embodiment shown in FIG. 2 is provided with a mechanism that allows the automatic lowering control mechanism D to operate only when the traveling speed is equal to or higher than a set value. , a normally open switch S ₂ is installed in series in the battery circuit, and a control lever 18 for the hydraulic continuously variable forward/reverse transmission mechanism 17 and the switch S ₂ are controlled to control the speed of the lever 18 above a certain set value. When the switch S ₂
In other words, the control mechanism D is operated only when the traveling speed is equal to or higher than a set value.

FIG. 4 shows a second modification of the main body drive structure,
In the first modification shown in FIG. 3, another normally closed switch S ₄ is installed in series in the battery circuit, and this switch S ₄ can be freely changed and fixed in position in the parallel movement direction of the base 4. a cam 2 which is provided and closes the switch _S4 when the threshing section C reaches a certain height position or more with respect to the traveling device 1;
0, so that the control mechanism D operates only when the threshing section C is at a certain height position, and the threshing section C is lowered to a certain height position by the operation. It is structured as follows.

The threshing section C is mounted on the traveling device 1 so that it can be raised and lowered by driving separately on the left and right sides, and as the turning steering operation is performed, the threshing section C on the inner side of the turn is first lowered and then moved to the set position. The threshing section C on the outer side of the rotation may be lowered after the threshing section C has been lowered to a certain point, or after a set time has elapsed after the start of lowering, and the control mechanism D can be modified in various ways.

Further, the threshing section C may be driven up and down by a double-acting cylinder, or by other structures such as a motor, and the drive structure can be modified in various ways.

In summary, the present invention provides the aforementioned combine harvester in which the traveling device and the threshing section are connected to each other via a link that swings rearward with respect to the traveling device as the threshing section descends, and settings for the traveling device are provided. The present invention is characterized in that an automatic lowering control mechanism is provided for automatically lowering the threshing section to the set position in response to a turning operation when the threshing section is located higher than the above-mentioned position.

That is, in conjunction with the turning operation from a state where the center of gravity of the machine is high, the threshing section is automatically lowered to lower the center of gravity of the machine, and as the threshing section is lowered, the center of gravity of the threshing section is lowered by the traveling device. By moving the traveling device backwards to increase the amount of ground sinking on the rear side of the traveling device and lifting the pre-reaping section in front of the threshing section upward, the ground of the pre-reaping section as the threshing section descends. It is now possible to safely perform turns with good maneuverability while preventing contact with the aircraft and suppressing the risk of tilting or overturning the aircraft.

[Brief explanation of the drawing]

The drawings show an embodiment of the combine harvester according to the present invention, FIG. 1 is an overall side view, FIG. 2 is a configuration diagram of the main body drive structure, and FIGS. 3 and 4 are configuration diagrams of modified examples, respectively. be. 1... Traveling device, C... Threshing section, D... Control mechanism.

Claims (1)

[Scope of Claims] 1. A combine harvester in which threshing units C and C are mounted on a traveling device 1 so as to be able to move up and down by driving, and the traveling device 1 and the threshing unit C are moved as the threshing unit C descends. The threshing section C is connected to the device 1 via links 3, 3 that swing backward, and when the threshing section C is located higher than the set position relative to the traveling device 1, the threshing section C is automatically moved in accordance with the turning operation. A combine harvester characterized by being provided with an automatic lowering control mechanism D for lowering the threshing section C to a set position. 2. The combine harvester according to claim 1, wherein the automatic lowering control mechanism D is provided with a mechanism that allows its operation only when the traveling speed is equal to or higher than a set value.