JPS6141532Y2 - - Google Patents

Description

[Detailed description of the invention] The cutting height adjustment device for conventional combines detects the cutting height by sliding a cutting height detection sensor attached to the cutting device on the ground, and adjusts the cutting device up and down according to this detected value. However, in wet fields, the cutting height detection sensor penetrates into the soil, so the cutting height is detected too high, and as a result, the cutting device goes into the soil, making it unusable and stopping. The cutting height had to be adjusted manually without getting any results.

In addition, if the relative position between the machine body and the reaping device is detected and the cutting height is adjusted, when working in a sloping field as shown in Figure 5, the weight of the machine will be loaded toward the rear of the traveling device during the upstroke. If the cutting height detection sensor is adjusted to match the upstroke, the cutting device will plunge into the soil during the downstroke,
On the other hand, if the cutting height is adjusted to be suitable for the downward stroke, the cutting height will become abnormally high in the upward stroke.

The present invention improves the above-mentioned drawbacks by allowing a single cutting height detection sensor to detect the field scene and the relative position to the machine body.

The embodiment shown in the drawings will be explained below.1
is a threshing device mounted on the platform of a combine harvester, and the rear part of the pre-processing frame 2 is pivoted on the upper part of the threshing device 1 (or a support installed at the front of the machine platform) so as to be movable up and down. A reaping device 6 consisting of a grass cutting body 3, a grain culm pulling frame 4, a cutting blade 5, etc. is attached to the front part of the pretreatment frame 2, and a grain culm that supplies the reaped grain culm to the threshing device 1 is attached to the rear part. A conveyance device 7 is mounted so as to be tiltable up and down to adjust the handling depth, and the pretreatment frame 2 is tilted up and down by a hydraulic cylinder 8.

The base of a support arm 10 is pivotally supported by a support shaft 11 to a bracket 9 attached to a portion hanging down from the shaft support of the pretreatment frame 2, so as to be movable up and down. A rod 13 protruding from the support arm 10 is returned to a pipe 14 fixed to the side surface of the support arm 10 and inserted through a spring 15, and is attached to the support arm 10 by being lifted by an operation wire 16.
The upper end of 6 is a control lever 17 provided near the control section.
One outer stop 18a of the operation wire 16 is connected to the control section, and the other outer stop 18b is connected to the control section.
are attached to the support arm 10, respectively.

Further, an arc-shaped elongated hole 19 centered around the support shaft 11 is bored in the bracket 9, and a thumbscrew 20 is inserted and screwed into this elongated hole 19 and the hole of the support arm 10. The arm 10 can be adjusted and fixed in a hanging position in contact with the ground as shown by a solid line or in a position in contact with the front of the aircraft body as shown in a chain line.

In the above-mentioned device, when performing reaping and threshing work in dry fields, when the support arm 10 is set in a hanging position and the hydraulic lever 21 is set in the lowered position, the switch 22 is turned ON in Figs. 3 and 4, and the cutting height is detected. Since sensor 12 is ON before grounding, solenoid 24 turns ON and solenoid valve 2
3 is opened and the pre-processing frame 2 is lowered, and when the cutting height detection sensor 12 touches the ground, it is turned off and the electromagnetic valve 23 is closed, so that the pre-processing frame 2, together with the reaping device 6, etc., is set at an appropriate cutting height.

Furthermore, when working in wet fields, the support arm 10 is tilted upward and set as shown by the chain line, so that the cutting height detection sensor 12 is not immersed in the mud and is opposed to the front wall of the threshing device 1, and the hydraulic cylinder 8 When the cutting height is reduced and the pre-processing frame 2 is tilted downward, when the appropriate cutting height is reached, the cutting height detection sensor 12 comes into contact with the machine body and turns off, and the electromagnetic valve 23 stops.

In addition, in the wet field, the traveling equipment partially sank into the mud,
Since the cutting height is lowered by that amount, the cutting height detection sensor 12 is turned OFF as quickly as the amount of settling mentioned above.
Adjust the angle of the support arm 10 so that
Alternatively, the operator tilts the operating lever 17 forward (to the left in FIG. 2) to return the cutting height detection sensor 12 and adjust the spring 15 to approach the machine body.

Furthermore, when working on sloped land, on the upward journey,
As the weight of the machine increases toward the rear of the traveling gear, the operating lever 17 is tilted backwards and the cutting height detection sensor 1 is connected via the operating wire 16.
2, the reaping device 6 is set low relative to the machine body, and on the downstroke, by setting the cutting height detection sensor 12 low, the reaping device 6 can be set at an appropriate height relative to the ground. .

As described above, the present invention is a combine harvester in which a reaping device is attached to the machine body in a vertically adjustable manner and a cutting height detection sensor is attached to the reaping device, and the cutting height detection sensor is attached to the machine frame of the reaping device to detect the cutting height. Since the sensor is mounted so that it can be rotated and fixed in a posture that detects the field scene and a posture that detects the relative position to the machine body, the cutting height detection sensor is selected to detect the field scene and the relative position to the machine body. This allows you to always work at the appropriate cutting height. Furthermore, the device is inexpensive because it uses a single cutting height detection sensor, without separately installing a cutting height detection sensor that detects the field scene and a sensor that detects the relative position of the reaping device and the machine body. It can be configured as follows.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a side view of the combine, Figure 2a is a side view of the main parts, b is a front view of the same, Figure 3 is a hydraulic circuit diagram,
FIG. 4 is a control circuit diagram, and FIGS. 5 and 6 are side views showing working conditions on a slope. DESCRIPTION OF SYMBOLS 1... Threshing device, 2... Pre-processing frame, 9... Bracket, 10... Support arm, 12... Cutting height detection sensor, 17... Operation lever, 19... Long hole.

Claims (1)

[Scope of utility model registration request] In a combine harvester in which a reaping device is attached to a machine body so as to be vertically adjustable, and a cutting height detection sensor is attached to the reaping device, the cutting height detection sensor is attached to a machine frame of the reaping device, and the cutting height detection sensor detects a field scene. A cutting height adjustment device for a combine harvester, characterized in that it is rotatably mounted so as to be in a posture that detects the relative position between the posture and the machine body.