JPS6359646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic planting depth control device for a rice transplanter in which a planting device with a grounding float is connected to the main body of the traveling machine so that the rice transplanter can be driven up and down.

In conventional automatic planting depth control devices in rice transplanters, the ground float of the planting device is configured to move up and down following changes in the planting depth, and the drive lifting mechanism of the planting device is controlled to move the ground float up and down. Previously, the operations were linked via mechanical means such as wires and link mechanisms, but when this was used, the raising and lowering of the grounding float would operate the wires and link mechanisms even when the planting device was raised and lowered. There is also a drawback that the planting device is automatically raised and lowered due to factors other than movement, resulting in a low precision in automatic planting depth control.

In view of these conventional drawbacks, the present invention has an object to improve the accuracy of automatic planting depth control.

The automatic planting depth control device for a rice transplanter according to the present invention is provided with a strain detector that can extract ground pressure fluctuations of the ground float as an electric signal on the planting device side, and The present invention is characterized in that it is equipped with a drive mechanism that automatically controls the raising and lowering of the planting device through electric signals taken out by the detector so that the float ground pressure is maintained within a set range.

That is, a strain detector detects a variation in planting depth along with an accompanying ground pressure variation, and the strain detector and drive mechanism are electrically linked to automatically maintain a constant planting depth. Therefore, the drive mechanism can be accurately and quickly linked to the detector regardless of disturbances such as the raising and lowering of the planting device, and this allows automatic planting depth control to be performed with extremely high precision. I've reached it. Moreover, there is an advantage that the setting value of the planting depth can be easily changed by adjusting the volume or the like.

Hereinafter, an embodiment of the present invention will be described based on the drawings. A planting device 3 is connected to the rear part of a riding-type traveling machine body 1 via a link mechanism 6 so as to be able to rise and fall freely. In a rice transplanter equipped with a grounding float 2 for leveling the ground that can freely swing up and down using a nearby fulcrum R, the automatic planting depth control device is configured using a ground float 2 that is swingably attached to the frame 7 of the planting device 3. A load cell 4 (an example of a strain detector) is provided between the ground float mounting bracket 12 and the ground float 2, which can extract ground pressure fluctuations of the ground float 2 due to changes in plowing depth as an electrical signal. , and a drive mechanism 5 is provided to automatically raise and lower the planting device 3 based on the output electric signal from the load cell 4 so that the float ground pressure is maintained within a set range.

The drive mechanism 5 includes a hydraulic cylinder 8 that drives the planting device 3 up and down, an electromagnetic control valve 9 for this, and an output signal a from the load cell 4 and a signal b from the setting device 10. The setting device 10 is configured such that its setting signal b can be changed.

In the embodiment, the strain detector 4 is shown as a load cell that generates an electromotive force in proportion to ground pressure, but it may also be a strain gauge that provides electrical resistance in proportion to ground pressure.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the automatic planting depth control device for a rice transplanter according to the present invention, with FIG. 1 being a side view of the entire rice transplanter, and FIG. 2 being a control block diagram. 1... Traveling machine body, 2... Ground float, 3...
...planting device, 4...strain detector, 5...drive mechanism.

Claims (1)

[Claims] 1. In a rice transplanter in which a planting device 3 with a grounding float 2 is connected to a traveling machine main body 1 so as to be able to be driven up and down, fluctuations in ground pressure of the grounding float 2 are connected to the planting device 3 side. A strain detector 4 that can be extracted as an electric signal is installed, and this strain detector 4
Planting depth in a rice transplanter characterized in that it is equipped with a drive mechanism 5 that automatically controls the raising and lowering of the planting device 3 through electric signals taken out by the rice transplanter so that the float ground pressure is maintained within a set range. Automatic control device. 2. The automatic planting depth control device in a rice transplanter according to claim 1, wherein the strain detector 4 is a load cell. 3. The automatic planting depth control device in a rice transplanter according to claim 1, wherein the strain detector 4 is a strain gauge.