JPH0767343B2 - Rice transplanter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanter that detects a variation in the depth of a paddy field with a grounding body and controls up and down the rice transplanter side.

2. Description of the Related Art Conventionally, there have been many rice transplanters of this type, but in a field where the number of times of raising and lowering of the grounding body increases, a so-called sensitivity adjusting device provided with a resistance means for limiting the raising and lowering operation is actually developed.
It had the configuration disclosed in Japanese Patent Publication No. 3 and Japanese Utility Model Publication No. 54-154237.

Problems to be Solved by the Invention In the conventional technology, in the case of a paddy field with severe unevenness, the number of times the rice transplanter is moved up and down is so frequent that the control operation is inevitably delayed with respect to the signal from the grounding body. No original technical measure was taken to prevent control operations that do not match the irregularities on the ground, and this frequent increase / decrease control is simply a sensitivity adjustment that increases the upward resistance of the grounding body as a detector. In order to prevent it by the means, there was a drawback that it pushed the topsoil of the paddy field and caused propulsion resistance, which made it impossible to perform accurate rice planting work.

Means for Solving the Problems The present invention, in order to solve the above problems, comprises a grounding body 13 that comes into contact with the surface soil surface of the paddy field and moves up and down due to a change in the depth of the paddy field. In a rice transplanter with a lifting control device in which the rice transplanter 7 side is moved up and down, an alarm is issued when the grounding body 13 is lifted and lowered more than a predetermined amplitude within a predetermined reference time. Alternatively, the rice transplanter is characterized by operating various operating mechanisms such as planting stop.

EFFECTS AND EFFECTS OF THE INVENTION According to the present invention, the resistance of the raising / lowering operation of the grounding body is always constant unless the sensitivity is adjusted, and the raising / lowering vibration is performed. Above a certain level, various operations are performed by appropriate means without deteriorating the planting performance, and proper planting can be performed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail. Reference numeral 1 denotes a passenger traction vehicle, which is a body 4 including a pair of left and right steerable driving front wheels 2 and 2 and a pair of left and right driving rear wheels 3 and 3. A steering handlebar 5 is provided in the center of the front left and right, and a steering seat 6 is provided behind it.

A rice transplanter 7 is provided at the rear portion of the machine body 4 so as to be able to move up and down via a link mechanism 9 operated by a hydraulic device 8.

This rice transplanter is an ordinary well-known device, 10 is a planting transmission box, 11 is a seedling mount that can be reciprocated left and right,
12 is a rotary type planting device. In addition, this planting device 12
Has a performance of planting much faster than the conventional crank type, and more specifically, since the transplant tool 12b is attached to the front and rear side surfaces of the rotating case 12a, the rotating case 1
2 plants can be planted in one rotation of 2a, which is theoretically capable of approximately twice as fast planting as in the past.

Reference numeral 13 is a central grounding body, and 14 is a side grounding body located on the left and right sides thereof, and the rear part of each is pivotally attached to the rice transplanter frame side so that the front part is vertically movable.

Reference numeral 15 is a switching valve for controlling the operation of the hydraulic device 8,
The switching lever 15a is attached to the front portion of the central grounding body 13
6 and an interlocking link 17 are interlocked with each other, and when the grounding body 13 rises above a predetermined appropriate vertical range with respect to the rice transplanter body, the piston 8a of the hydraulic device 8 is projected to raise the rice transplanter 7, and vice versa. When it becomes lower, the piston 8a is retracted and lowered.

Reference numeral 18 is a vibration sensor, and a sensor actuator 18a is interlocked with the base side link plate 17a of the interlocking link 17 so that the number of times the link plate 17a swings above a certain amplitude can be counted.

Then, by the control circuit shown in FIG. 4, the vibration sensor 18 counts the vertical amplitude of the central grounded body 13, and the electric signal from the counted number and the electric signal from the reference oscillator 19 (oscillator with a timer). Are compared by a comparator 20, and then amplified by an amplifier circuit 21, so that an alarm device 22 warns the operator when the vertical amplitude of the central grounded body 13 exceeds a prescribed value within a fixed time.

In the illustrated example, the reference oscillator 19 is simply an oscillator with a timer, but the alarm device 22 may be operated by comparing this with a propulsion distance in consideration of speed. In this case, the rotation speed sensor 23, which measures the rotation speed of the rear wheel drive shaft for a certain period of time, is used as a timer for the oscillation circuit 19 so as to increase the time and compare with this reference value. A good control circuit is recommended.

In the illustrated example, the embodiment in which the alarm device 22 is operated has been described, but the switching arm 24 of the planting clutch can be turned off by an electromagnetic valve or the like by the control signal, or the transmission can be set to the low speed side. You can also switch.

Explaining the operation of the above example, the central grounding body 13 and the side grounding bodies 14 are frequently moved up and down during the rice planting work when the unevenness of the cultivator in the field is severe. And this central grounding body 13
The hydraulic switching valve 15 is frequently switched depending on whether the rice transplanter 7 is moved up and down by the hydraulic device 8. By the way, if the raising / lowering control is performed too frequently, switching of the valve 15 and the raising / lowering of the rice transplanter with time lag do not coincide with each other, and it is erroneous, and it is preferable to perform slow control.
Therefore, in this embodiment, when the above situation occurs,
The vibration of the central grounded body 13 is detected by the vibration sensor 18, which is compared with the signal from the reference oscillation circuit 19, and the alarm device 22 warns.

Therefore, in this state, the operator limits the switching operation of the hydraulic pressure switching valve 15 or restricts the throttle valve in the hydraulic circuit.
Take measures such as squeezing 25 to slow down the control operation and perform reliable planting work.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is an interlocking mechanism diagram of essential parts, FIG. 3 is a hydraulic circuit diagram, and FIGS. It is a block circuit diagram of control. In the figure, 1 is a tow vehicle, 7 is a rice transplanter, and 18 is a vibration sensor.

Claims (1)

[Claims] 1. A rice transplanter equipped with a lifting control device, which comprises a grounding body 13 which comes into contact with a surface soil surface of a paddy field and moves up and down according to a change in the depth of the paddy field, and the rice transplanting device 7 side is lifted and lowered by the lifting operation signal. The grounding body 13 activates various operating mechanisms such as an alarm or a planting stop when the number of times of ascending and descending vibrations having a predetermined amplitude or more is performed at a predetermined reference number or more within a predetermined reference time. Rice transplanter.