JPS5947578B2 - reaping harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a steering sensor to detect the lateral positional deviation of the machine body relative to the planted stem culm introduced into the reaping section as it advances, and based on this detection result, adjusts the position of the machine body relative to the stem culm. A hydraulic steering control device is configured to switch and control a steering control valve to correct the direction of movement of the cutting section, and a cutting height sensor detects the height of the cutting section above the ground, and based on the detection result, The present invention relates to a reaping harvester equipped with a hydraulic mowing height adjusting device configured to switch and control a mowing height control valve to raise and lower a reaping part and maintain it within a fixed height range from the ground.

This type of reaping/harvesting machine is capable of automatically moving the machine to follow the planted stem culm, and also maintains the height of the reaping section above the ground within a certain range to maintain a constant cutting height. It is something that can be achieved.

However, in such a reaping/harvesting machine, if one attempts to drive the steering control device and the cutting height adjustment device using one hydraulic pump in order to reduce the cost of the overall structure, the steering sensor and When the cutting height sensor operates at the same time, the steering control device and cutting height adjustment device operate together, causing a delay in operation or insufficient control amount compared to when each device operates independently. There were drawbacks that led to inconvenient situations such as

The technical problem to be solved by the present invention is to reduce the control delay control amount in a reaping harvester in which the steering control device and the cutting height control device are driven by one hydraulic pump. The aim is to simplify the structure by devising a hydraulic circuit so that complete and reliable control can be performed.

The technical means of the present invention taken to solve the above problems are as follows:
A steering sensor detects the lateral positional deviation of the aircraft relative to the planted stem culm that is introduced into the reaping section as it advances, and the steering control is used to correct the direction of movement of the aircraft relative to the stem culm based on this detection result. A hydraulic steering control device configured to switch and control a valve and a cutting height sensor detect the height of the reaping section above the ground, and based on the detection results, the reaping section is raised or lowered to maintain a fixed height above the ground. In the reaping/harvesting machine, the steering control device and the cutting height adjustment device are equipped with a hydraulic cutting height adjustment device configured to switch and control a cutting height control valve to maintain the cutting height within When driven by one hydraulic pump, the pressure oil from the hydraulic pump is supplied to the upper side of the pressure oil supply circuit than the steering control valve and the cutting height control valve. A switching valve is provided that switches to supply pressure oil to one side, and the switching valve operates to supply pressure oil to the steering control valve side when the steering sensor detects a lateral positional deviation of the aircraft body. Thus, the switching valve and the steering sensor are linked.

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

In other words, even if both the steering sensor and the reaping sensor operate simultaneously, the switching valve located on the upstream side of the flow path than both control valves will switch to the steering control valve side based on the detection operation of the steering sensor. Since the state is switched to supplying pressure oil, pressure oil from the pump is supplied only to the steering control device.
Pressure oil will not be supplied to the cutting height adjustment device.

Therefore, the steering control device can be driven with priority over the cutting height adjustment device, and reliable control can be performed without delay or insufficient control even when both sensors are detected simultaneously.

In other words, if the operation of the steering control device is delayed, the machine will come off the planted stem culm, leaving uncut material, which will require manual cutting, which will significantly reduce work efficiency. We focused on the fact that there is no problem with height adjustment even if the operation is delayed a little, and by taking advantage of this fact, we have been able to achieve smooth and efficient work while reducing the cost of the overall structure.

In order to drive the steering control device with priority in this way, a special electrical circuit is installed that detects and determines whether the steering control valve and cutting height control valve are operating independently. Compared to the case where control is performed using a conventional control circuit, the structure can be constructed simply by devising the hydraulic circuit itself, which uses only one switching valve.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a pair of left and right crawler traveling devices 1a.

A combine harvester is shown in which a threshing device 2 is mounted on 1b and a reaping section A is connected to the front of the machine.

In the reaping section, the front part pulling device 3 pulls up a plurality of planted stem culms, and the reaping device 4 cuts off the base end of the plant, and then, as shown in FIG. The harvested stem culms are conveyed laterally to one side while merging, and the merging stem culms are supported in an inclined position with the tip side deviated towards the inside of the body rather than the plant base side, and then the tips are retained and conveyed. The tea stock is transported rearward by a vertical conveyance unit 6 consisting of a device 6a and a stock head holding and conveying device 6b, and changed to a sideways posture at the end of the transport.
The feed chain 7 of FIG.

Further, this combine harvester is equipped with a hydraulic steering control device, which will be described below, in order to automatically run the combine harvester while following the planted stem culms.

That is, as shown in FIG.
On one side of the stem culm introduction path B formed along the side,
A steering sensor 8 is provided as a mechanism for detecting lateral deviation of the machine body with respect to the introduced planted stem culm.

This sensor 8 is configured to be elastically biased in a position where it crosses the path B, and to swing backward when it comes into contact with a stem culm, so that in the crossing position, the stem culm is on the other side. It detects that the tea culm has deviated to the side armpit in the maximum swinging posture, and also detects that the tea culm has deviated to the side armpit in the maximum swinging posture. It is configured to detect that the switch is located at a substantially proper position in between, and closes the normally open switch S1 in the transverse position, and closes the normally open switch S2 in the maximum swing position.
).

On the other hand, the crawler traveling devices 1a, lb are driven by an output transmitted from a mission case (not shown) that is linked to an installed engine E (see FIG. 1), and
A pair of left and right steering clutch brakes (not shown) installed in the transmission case are connected to a pair of hydraulic cylinders 9a,
9b (see FIG. 4) is alternatively operated by the alternative extension operation, an alternative drive state is manifested,
With this, the aircraft is configured to be steered.

When the switch S1 or S2 is closed due to detection by the steering sensor 8, the hydraulic cylinder 9
The solenoid part of the electromagnetic switching valve ■1 is configured to be energized as a steering control valve that controls the operation of the switches SL and 9b, and as the switches SL and S2 are closed, In this combine, the height of the cutting section A from the ground is maintained within a certain range, and the cutting height is controlled within a certain range. The cutting height adjustment device described below is installed to maintain the cutting height.

That is, the reaping section A is supported via an elevating frame 10 pivotally connected to the machine so as to be able to swing up and down, and a hydraulic cylinder 11 is provided between the elevating frame 10 and the machine.
is interposed, and the expansion/contraction operation of the cylinder 11 is configured to be controlled by switching the electromagnetic three-position switching valve v2 as a cutting height control valve.
In the forced extension state of 1, the reaping part A is forcibly lifted, in the free extension and contraction state of the cylinder 11, the reaping part A is lowered by its own weight, and further, in the fixed and locked state of the cylinder 11, the reaping part A is moved to a desired position. It is configured to be fixedly held.

On the other hand, the reaping section A is equipped with a cutting height sensor 12 that is rotatable around the horizontal axis, and the cutting height sensor 12 is oscillated as the height of the reaping section A from the ground changes. 1
A pair of switches S3. Equipped with S4.

These switches S3. A switch S4 is connected to a solenoid section that changes the position of the spool of the switching valve 2, and is a switch S3 that comes into contact with the cutting height sensor 12 when the height of the cutting section A above the ground becomes higher than a desired position range. is operated, the hydraulic cylinder 11 is brought into a freely extending and contracting state, and the switch S4 is brought into contact with the cutting height sensor 12 when the height of the cutting section A from the ground becomes lower than the desired position range. As the hydraulic cylinder 11 is operated, the forced extension state of the hydraulic cylinder 11 appears, and furthermore, when the height of the reaping section A is within the desired position range, both switches S1. Both S2 are held in a non-operating state, and the cylinder 11 is fixedly locked.

Further, the hydraulic steering control device and the hydraulic cutting height adjustment device are connected to one hydraulic pump P, as shown in FIG.
and when the switch S1 or S2 of the steering control device is closed, another electromagnetic 2
The solenoid section of the position switching valve (3) is also energized.

When the switching valve 3 is switched, the pressure oil is switched from being supplied to the cutting height adjustment device to being supplied only to the steering control device. The steering control device is configured to be driven with priority over the steering control device.

[Brief explanation of the drawing]

The drawings show an embodiment of the reaping harvester according to the present invention, in which FIG. 1 is a side view of the combine, FIG. 2 is a schematic plan view of the reaping section,
FIG. 3 is a plan view showing the steering sensor mounting portion, and FIG. 4 is a hydraulic circuit diagram. 8... Steering sensor, 12... Cutting height sensor, A... Reaping section, P... Hydraulic pump, ■1... Steering control valve, ■2...
...Cut height control valve, ■3...Switching valve.

Claims (1)

[Claims] 1 The steering sensor 8 detects the lateral positional deviation of the aircraft with respect to the planted stem culm that is introduced into the reaping section A as it advances, and based on this detection result, the steering is performed to correct the direction of movement of the aircraft with respect to the stem culm. A hydraulic steering control device configured to switch and control the direction control valve ■1, and the reaping section A.
The cutting height above the ground is detected by a cutting height sensor 12, and based on the detection result, the cutting height control valve 2 is switched and controlled to raise and lower the cutting part A to maintain it within a certain ground height range. In a reaping harvester equipped with a hydraulic cutting height adjustment device, the steering control device and the cutting height adjustment device are driven by one hydraulic pump P, and the steering control valve ■1 and cutting height control valve ■2 are switched to supply pressure oil from the hydraulic pump P to either one of the control valves Vl and V2 on the upper side of the pressure oil supply circuit. A switching valve (3) is provided, and the switching valve (3) operates to supply pressure oil to the steering control valve (1) when the steering sensor 8 detects a lateral positional deviation of the aircraft body. The reaping harvester is characterized in that the switching valve (3) and the steering sensor (8) are linked.