JPH018092Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention detects missing plants that occur during rice transplantation and issues a warning to the operator.

(b) Prior art Most rice transplanters' missing plant alarm devices generally use microswitches, photoelectric sensors, etc. to detect the presence or absence of seedlings and sound an alarm when the planted seedlings are transported using a planting claw.

However, although the planted seedlings are being transported, they are often lodging or floating seedlings, which have poor rooting and result in missing plants, so it is not valid to detect them using only the seedling removal board. be. To compensate for this, if the sensor touches the leaf part of the seedling after planting, it would indicate that the leaf is not missing. If it does not appear, the sensor cannot be used after planting.

(c) Problems that the invention aims to solve In consideration of these cases, the invention provides two sensors, upper and lower, to ensure that the sensors work in either case, and a switch to switch between them. It is something.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A tactile sensor that detects the presence or absence of planted seedlings by contact with the upper sensor 9h that detects the seedlings that are being transported after the planting claw has cut them off.
and a lower sensor 9 that detects the leaves of seedlings after planting.
It is possible to switch between sending the signal from the upper sensor 9h, which detects the seedlings being transported, or the signal from the lower sensor 9l, which detects the leaves of the seedlings after planting. A changeover switch 12 is provided.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Figure 1 is an overall view of the walking type 4-row rice transplanter.

In the four-row rice transplanter, an engine 3 is placed on a main float 1, and side floats 2, 2 are provided on both sides of the main float 1.

Swing cases 5, 5 are pivotally supported by a running transmission case 3a provided at the rear of the engine 3, and lug wheels 4, 4 are supported at the ends of the swing cases 5, 5.

Power is transmitted from the traveling mission case 3a to the planting mission case 3b via a power transmission shaft within the power transmission case 11, thereby driving the seedling stand 6 and the planting claws 7. The planting claw 7 rotates on an elongated trajectory passing through the notch of the seedling take-out plate 8, pinches and cuts the seedling pine placed on the seedling stand 6 and moves on the seedling take-out plate 8, and Plant on flattened areas.

Reference numeral 19 indicates a handle, and since the operator holds the handle 9 and is looking straight ahead in order to plant straight, it is not possible to monitor only the missing plants in the planting area below the seedling platform 6. be.

Even with riding-type rice transplanters, the operator cannot only monitor the planting area, and relies on a stock-missing alarm system. A stock shortage warning lamp 20 and a check clamp 21 are attached to the handle 19.

In this invention, a tactile touch sensor is used as an upper sensor 9h that detects the presence or absence of planted seedlings during transportation.
and a lower sensor 9L that detects the presence or absence of planted seedlings after planting.

The tactile contact sensor 9 is made of a thin conductive wire and protrudes from the seedling stand support arm 17, the seedling take-out plate 8, the seedling take-out reinforcing plate 15, etc. The claws 7 are provided so as to come into contact with the stems and leaves of the planted seedlings being transported or the leaves of the seedlings after being planted.

FIG. 2 is a perspective view of a tactile type sensor, and FIG. 3 is a circuit diagram of the stock shortage alarm device of the present invention.

The tactile type contact sensor 9 is composed of a thin conductor, and as shown in Fig. 3, an upper sensor 9h detects the seedlings being transported by the planting claw, and an upper sensor 9h detects the leaves of the seedlings after planting. The lower sensor 9l is provided at two locations.

If the seedlings are detected after being planted, it means that the seedlings were definitely transported during transportation, which means that the seedlings will be detected twice, but if the water is deep and the tips of the leaves are only slightly protruding after planting. If not, it is difficult to sense the seedlings after planting, and in such a case, the seedlings being transported are sensed and a changeover switch 12 is used to switch between the two.

The tactile type contact sensor 9 has an insulating case 10
The connectors are connected to the positive input terminals of the comparators 27 and 28 through a shielded wire and a resistor of about 100 MΩ.

Upper sensor 9 detects seedlings being transported
The changeover switch 12 determines whether the signal h is input or the signal from the lower sensor 9l that detects the leaves of the seedling after planting is input.

The reference voltage output from the constant voltage device 26 is input to the negative input terminals of the comparators 27 and 28. A bias resistance is provided between the plus and minus terminals of each comparator 27, 28 by using a variable resistor 29 for bias voltage setting and a resistor 38.

When the tactile type contact sensor 9 is not in contact with the planted seedlings, the potential of the positive input terminal is made slightly higher than the potential of the negative input terminal. Therefore, when the sensor 9 touches the planted seedling, it is grounded through the surface resistance value of about 80 MΩ of the planted seedling, and the positive input terminal has a lower potential than the negative input terminal, and each comparator 27, 28 The output becomes low level. The variable resistor 29 adjusts the bias voltage, and therefore the sensitivity of the seedling sensor 9 is also adjusted by the variable resistor 29, depending on the dryness and humidity of the seedlings and the weather conditions.

The output of the comparator 28 passes through a PNP type switching transistor 22 and is configured to light up the check clamp 21. When the planted seedling A is not touched, the output of the comparator 28 is at a high level, and the check lamp 21 is turned on. Although the lamp 21 is off, when the tactile contact sensor 9 touches the planted seedling, the comparator 2
The output of 8 becomes low level, the switching transistor 22 turns on, and the check clamp 21 turns on.
lights up.

Conversely, the missing plant warning lamp 20 is turned on by an inverting circuit using an NPN type switching transistor 24 and a PNP type transistor when the sensor 9 does not contact the planted seedling A several times in a row.
Configured to provide an alert.

If there is only one missing plant, it will be divided more often than other seedlings due to summer division of neighboring seedlings.
Since the system replenishes the missing stock, it is configured to ignore the case where one plant is missing, and to issue an alarm only when there is a continuous stock shortage that would affect the yield.

Therefore, in order to prevent the stock shortage warning lamp 20 from immediately lighting up even if only one stock is missing, a charging circuit is constructed using a combination of a capacitor 30 and a variable resistor 25, and the variable resistor 25 is used to detect the stock shortage. The number of stocks from when the stocks start to appear until the warning lamp 20 lights up can be adjusted.

39 is a diode for preventing surge voltage. In this way, check clamp 21 and stock shortage warning lamp 2
The check clamp 21 checks the presence or absence of each seedling to be planted, and the alarm lamp 20 is configured to light up when there are continuous shortages of seedlings. There is.

In the present invention, the upper sensor 9h that detects the seedlings that are being transported is used in the missing plant warning device configured as described above.
and a lower sensor 9L that detects the leaves of seedlings after planting.
are arranged one above the other as shown in FIGS. 4 and 5.

The upper sensor 9h that detects the seedlings being transported on the upper side touches the stems and leaves of the planted seedlings A that are being transported with the planting claws 7, and detects the presence or absence of the seedlings. The lower sensor 9l, which detects the leaves of seedlings after planting, touches the tips of the leaves of seedlings A after they have been planted in the field, and checks whether the seedlings are planted without lodging or floating. It is a sensor that detects.

In the embodiments shown in FIGS. 4 and 5, there is one insulating case 10, and two upper and lower sensors 9h and 9L protrude from the one insulating case 10, but this configuration is limited. It is not something that will be done.

In the embodiment of FIG. 4, the upper and lower sensors 9
The insulating case 10 at the base of h, 9L is installed protruding from the seedling stand support arm 17, and the tips of the sensors 9h, 9L are bent at right angles to the rotation trajectory of the planting claws and the direction of movement of the rice transplanter to plant seedlings. It is designed to lightly touch the tip of the leaf of A.

In the embodiment shown in Fig. 5, the upper and lower sensors 9h and 9L
Two seedlings A are placed on each side so that they are lightly pinched and touching from the left and right sides. In the embodiment shown in FIG. 5, the insulating case 10 at the base of the sensors 9h and 9L is fixed to the seedling take-out plate 8. 15 is a seedling outlet reinforcing plate.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, under normal field conditions, the lower sensor 9L that touches the seedlings after planting is used to detect two aspects at once: whether the planted seedlings have been completely transported and whether they have been planted correctly. The system also detects seedlings that fall over during planting and missing plants that become floating seedlings. Since the missing plants can be detected using the upper sensor 9h that comes into contact with the planted seedlings being transported after the attached nails have been cut,
In either case, the stock shortage alarm system can be operated in the best possible manner.

Second, when the water depth in the field is particularly deep, the lower sensor 9 detects the leaves of the seedlings after planting.
When attempting to detect missing plants using the tactile contact sensor 9, accurate detection cannot be made if the sensor is submerged in water; By using only the upper sensor 9h, it is possible to detect missing plants.

Thirdly, since the lower sensor 9l that detects the leaves of the seedlings after planting normally detects the planted seedlings A after planting, there is a possibility that the seedlings may be conveyed incorrectly by the planting claws and the seedlings after planting. This makes it possible to simultaneously detect both lodging and floating seedlings.

[Brief explanation of the drawing]

Figure 1 is an overall view of the walking type 4-row rice transplanter, Figure 2
The figure is a perspective view of the tactile sensor, Figure 3 is a circuit diagram of the missing plant warning device of the present invention, Figure 4 is a drawing showing an embodiment in which the sensor is attached to the seedling support arm, and Figure 5 is the seedling removal. It is a drawing showing an example in which a sensor is attached to a plate. A... Planted seedlings, 7... Planting claws, 8... Seedling take-out board, 9h... Sensors that detect seedlings being transported, 9l... Sensors that detect the leaves of seedlings after planting. , 12...changeover switch.

Claims (1)

[Scope of utility model registration request] A tactile sensor 9 detects the presence or absence of a planted seedling by contact, and an upper sensor 9 detects a seedling being transported after the planting claw has cut the planted seedling.
h and a lower sensor 9l that detects the leaves of seedlings after planting are provided, and whether the signal from the upper sensor 9h that detects the seedlings being transported is transmitted or the leaves of the seedlings after planting are A changeover switch 12 enables switching whether the signal from the lower sensor 9l that detects the
A stock shortage warning device for a rice transplanter, characterized by being provided with.