JPS61281964A - Soil hardness detector of paddy field mobile agricultral machine - Google Patents

Abstract

PURPOSE:To detect the soil hardness accurately and safely by providing a sound wave oscillator and a sound wave receiver to measure the speed or the time of sound wave propagation. CONSTITUTION:When a switch signal is received from a switch signal circuit 16, the sound wave is oscillated from an oscillator 3 into soil, and a time measuring circuit 15 measures the time to the reception of a receiver 4. This time is compared with the reference time of a reference time setting circuit 17 to generate a control signal from a control signal circuit 18. If the arrival time of the sound wave is shorter than the reference time, the switching sensitivity of an oil pressure valve due to a float is not changed. If the soil hardness is lower, the arrival time of the receiver 4 is shorter because the sound wave is propagated in the soil in lower speed, and an adjustment control circuit 14 performs the control to make the sensitivity of the oil pressure valve higher. If the soil hardness is higher, the circuit 14 performs the control to make the sensitivity of the oil pressure valve lower because the propagation speed of the sound wave is lower.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a soil hardness/softness detection device for detecting the hardness/softness of the soil that a paddy field moving agricultural machine is traveling on, and can be used in rice transplanters and seeding machines.

Conventional technology rice transplanters are equipped with a float that slides on the soil surface to support part of the machine body on the soil surface, but the amount of settling of this machine varies depending on the hardness and softness of the soil, so it is necessary to detect the hardness and softness of the soil. There is a mechanism in which a spring acts on the soil and the distortion of this spring is detected.

Problems to be Solved by the Invention In this type of system in which a tangible object such as a spring is physically intervened on the soil surface, the soil is contaminated with straw debris, and when this acts on the spring, the soil cannot be properly ground. Therefore, even if the body of the rice transplanter is controlled up and down using this detection device, it is often difficult to perform accurate control.

Means for Solving the Problems The present invention includes a sonic oscillator (3) that oscillates sound waves while maintaining a predetermined horizontal distance from the ground while maintaining a predetermined horizontal distance on a body (2) that moves on a paddy field soil surface (1); The soil hardness/softness detection device for the rice paddy moving machine 7a is configured to include a sound wave receiver (4) that receives the oscillated sound waves.

Functions and Effects of the Invention When performing a predetermined work while moving on the paddy soil surface (1), the sound waves emitted from the sonic oscillator (3) are propagated through the soil and emitted from the oscillator (3). The propagation speed of sound waves in paddy soil, which is received by the sound wave receivers (4) located at fixed intervals, is slower in hard soil than in soft soil. By measuring the sound wave propagation velocity or time until reception according to (4), the hardness and softness of the soil at this traveling position can be detected. As a result, the drawbacks mentioned at the beginning can be overcome, and more accurate and safe detection can be performed. Moreover, the configuration can be simplified.

Embodiment In the illustrated example, the rice transplanter includes a vehicle body (6) having running wheels (5), a prime mover (7), a control handle (8),
A seedling tank (9) that stores seedlings, a planting device (10) that separates and transplants the seedlings supplied from this seedling tank (9), and supports parts of the rice transplanting machine such as these seedling tanks (9). A float (11) that slides on the soil surface is installed.

This part of the flow) (11) connects the rear end to the support shaft (12).
), the front end is able to move up and down, and this up-and-down movement switches the hydraulic valve (13) and connects it to the float (
11) moves upward above a predetermined level, the wheel (5) is moved downward relative to the vehicle body (6) by a mechanism such as a hydraulic sill (14), and conversely, when the float (11) moves below a predetermined level, the wheel (5) is moved downward relative to the vehicle body (6). In conjunction with switching to move the wheel (5) upward,
The planting device (10) adjusts and controls the vertical movement relationship between the wheels (5) and the flow (11) according to the depth of the soil tiller.
) A depth control device is configured to keep the seedling planting depth constant.

A sonic oscillator (3) is installed on one of the left and right pair of floats (11).
) with the oscillator facing the contact part with the soil surface (1), and the other flow (11) with this oscillator (3).
A receiver (4) is installed to receive sound waves from the soil surface (1).
) The receiving part faces the contact part.

The seedling transplanter is equipped with a control device, and a central processing device (
cpu) adjusts the switching operating pressure of the hydraulic valve (13) to be switched by the float (11). For example, when the soil is soft, the spring pressure of this switching operating pressure is weakened and the valve (13) is switched. An adjustment control circuit that makes the switching sensitive and, when the soil is hard, increases the spring pressure to make it less sensitive (
14) is constructed in conjunction with each other to control.

This central processing unit (CPU) is provided with a switch signal circuit (1G) for starting each function in the oscillator (3), receiver (4), time measurement circuit (15), etc. ) The sound waves oscillated by the receiver (4)
A time measurement circuit (15) is used to measure the time taken to reach , and the time detected by the time measurement circuit (15) is compared to the reference time set by the reference time setting circuit (17) and a comparator (18). ), if this time is within the standard time range, no control signal is output from the control signal circuit (18), but if the time is longer than the standard time range, the soil hardness is large. Therefore, the switching pressure is controlled to be strong, and conversely, when the time is shorter than the reference time width, it is assumed that the soil is soft and the switching pressure is controlled to be made sensitive.

When performing seedling planting work while the aircraft is running, a switch signal is sent from the switch signal circuit (lfl) of the central processing unit t (CPU") whose flow (11) is sliding on the soil surface. Then, a sound wave is emitted from the oscillator (3) into the soil, and the one-hour measurement circuit (15) measures the time until the receiver (4) receives this sound wave. ), the control signal circuit (18) issues a control @ signal.

When the arrival time of this sound wave is within the reference time, there is no major change in soil hardness, so the switching sensitivity of the hydraulic valve (13) by the float (11) does not change. However, if the soil becomes softer than this, Since the propagation of sound waves in the soil becomes faster, the time it takes for the sound waves to reach the receiver (4) to be received by the receiver (4) becomes shorter, and the adjustment control circuit (14)
13) is controlled and adjusted to make the switching sensitivity sensitive. or,
Conversely, as the soil hardness increases, the propagation of sound waves in the soil slows down, so the control is adjusted to make the switching sensitivity of the hydraulic valve (13) less sensitive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front sectional view of a portion of the system, FIG. 2 is a side view, and FIG. 3 is a control block circuit diagram. In the figure, code (1) is the paddy soil surface, (2) is the aircraft, and (3)
indicates a sonic wave oscillator, and (4) indicates a sonic wave receiver. Patent applicant name: Iseki Toriki Co., Ltd. Representative Masaaki Iseki Figure 1

Claims (1)

[Claims] The aircraft (2) moving on the paddy soil surface (1) is equipped with a sonic oscillator (3) that emits sound waves while maintaining a predetermined horizontal distance while touching the ground, and a sonic receiver (4) that receives the emitted sound waves. ) Soil hardness/softness detection device for rice field mobile agricultural machinery.