JPH0461603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sensor for a fertilizer application device installed in, for example, a rice transplanter. The fertilization device is configured to fall and supply fertilizer into a field fertilization trench through a trencher, and an electrode is provided inside the trencher,
The present invention relates to a clogging sensor for a fertilizer applicator that detects fertilizer adhering and accumulating in a furrower based on a change in electrical resistance between both electrodes.

[Conventional technology]

As a clogging sensor for this type of fertilization equipment,
One electrode is connected to the trencher main body and grounded, and the other electrode is supported by a protrusion on an insulator that is thinly attached to the inner wall of the trencher to prevent fertilizer clogging that occurs inside the trencher. can be electrically detected based on the degree of adhesion of fertilizer that adheres and accumulates on the insulator.

In other words, due to the adhesion of fertilizer on the insulator, conduction occurs between the trencher body and the electrode, and the electrical resistance between the two decreases.If the accumulation of fertilizer progresses further and the resistance falls below the standard value, the sensor outputs a detection signal.

[Problem that the invention seeks to solve]

However, the sensor with this structure has the following problems.

In other words, when fertilizing a paddy field at the same time as rice planting or direct sowing, muddy water splashed up during the work may adhere to the insulation, or water vapor from below may cause damage to the insulation. When dew condenses on the body, the moisture becomes a water film, and this water film creates electrical continuity between the trencher body and the electrode, causing a false detection signal to be output even if there is no fertilizer clogging. be.

The present invention focuses on such a situation and aims to prevent erroneous detection by the sensor due to conduction due to a water film by making a simple modification to the electrode structure of the sensor.

[Means for solving problems]

A characteristic configuration of the present invention, which has been made to achieve the above object, is that at least one of the electrodes is provided in a space within the groove cutter via an insulated small-diameter arm.

[Effect]

In other words, according to the above configuration, the sensor outputs a detection signal because the fertilizer attached to the insulator grows and reaches the electrode supported in an insulated state by the arm, and the positive and negative electrodes are electrically connected. Or, if the negative side is connected to a groove maker and grounded, the positive side electrode and the groove maker are electrically connected, and if water droplets simply adhere to the arm, the diameter of the arm is small. Therefore, it cannot form a water film that conducts them, but simply falls as water droplets, and cannot be the cause of false detection.

〔Effect of the invention〕

As a result, it has become possible to prevent erroneous detection due to moisture adhesion and to accurately detect fertilizer clogging.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 3, a seedling planting device A is connected to the rear end of a riding-type traveling body 1 via a link mechanism 3 that moves up and down by the expansion and contraction of a hydraulic cylinder 2, thereby constructing a riding-type rice transplanter. It has been done.

The seedling planting device A includes a transmission case 5 to which power is transmitted from the traveling body 1, a seedling platform 6 on which the pine-shaped seedlings W are placed, and a planting system in which seedlings from the seedling platform 6 are planted one by one onto a field. The arm 7... is composed of a plurality of soil leveling floats 8 and the like arranged in parallel in the left and right direction of the seedling planting device A, and the seedling planting device A is further equipped with a fertilizing device B that sends fertilizer to the field when seedling planting is activated. It is installed.

As shown in Fig. 1, the fertilizer applicator B is configured for five rows so that each planting arm 7 sends fertilizer to each side of the field where seedlings are planted, and the structure is detailed below. Describe.

A hopper 10 that stores granular fertilizer 9, a feeding mechanism 12 built into a casing 11 that is connected to the lower part of the hopper 10, a hose 13 that guides the fertilizer fed out from the feeding mechanism 12, and a lower end of the hose 13. The connected furrowers 14 constitute one row unit of the fertilization device B.

The feeding mechanism 12 has recesses 12a, 1 on the upper surface.
The planting arm 7 is made of a cylindrical body 12b formed with a cylindrical body 2a, and when the swinging force of the link mechanism 15 that sets the operating locus of the planting arm 7 is transmitted via the rod 16, the planting arm 7 swings reciprocatingly around the left-right axis. Recessed portion 12a, 1
It operates so that the fertilizer that has entered 2a is distributed and dropped in the front and rear directions.

As shown in the figure, the casing 11 housing the feeding mechanism 12 is equipped with brushes 17, 17 that come into sliding contact with the feeding cylinder 12b.
The amount of fertilizer sent out from 2b is regulated to a certain amount.

The trencher 14 is made of a metal material, and has a substantially U-shaped cross section with a rearward opening. By connecting the rear part of the groove cutting plate 19 and the bracket 18 with slotted bolts, the groove cutting device 14 is attached to the ground leveling float 8 so that its vertical position can be adjusted.

Furthermore, a clogging sensor S for detecting clogging or narrowing of the fertilizer supply path from the feeding mechanism 12 is provided near the connecting portion with the hose 13 inside the trencher 14.

In other words, the sensor S is connected to the front wall 1 of the groove creator 14.
4a through screws 20, 20, a small-diameter arm 22 protruding from the insulator 21, a positive electrode piece 23 exposed at the tip of the arm 22, and the screws together with the insulator 21. 20 is provided with a negative electrode piece 24 which also serves as a lug terminal and which is tightened and fixed to the groove making device 14 by a screw terminal 20. The arm 22 has a metal core wire 27 connected to the positive cord 25 of the sensor S covered with an insulating resin, and the exposed portion at the tip, that is, the electrode piece 23 points into the space inside the groove cutter 14. It is made to protrude downward so that it exists in a shape.
An appropriate gap is provided between the positive side electrode piece 23 and the groove cutter 14 to prevent water droplets from intervening and causing electrical continuity between the two.

A positive cord 25 connected to the core wire 27 and a cord 26 connected to the negative electrode piece 24 are connected to a detection circuit (not shown) of the sensor S. This detection circuit converts the electrical resistance value between the electrode pieces 23 and 24 into a voltage value, then compares it with a reference voltage value, and if the voltage value is lower than that, outputs a detection signal and lights up the lamp L. . The lamp L is provided on the casing 11 of each row in correspondence with the sensor S of each row, so that it is possible to easily identify the furrower 14 in which the fertilizer has clogged or narrowed.

[Another example]

In addition, in carrying out the present invention, two arms 22, 22 may be made to protrude from the insulator 21, and one of them may support the positive side electrode piece 23 and the other side may support the negative side electrode piece 24. . Further, the electrode pieces 23 and 24 may be made into separate members that can be replaced.

Note that although numbers are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the clogging sensor for the fertilization device according to the present invention, and FIG. 1 is a vertical side view of the fertilization device, FIG. 2 is a cross-sectional plan view of the main parts, and FIG. 3 is an overall side view of the rice transplanter. be. 12... Feeding mechanism, 13... Hose, 14...
...Groove cutter, 22...Arm, 23, 24...Electrode.

Claims (1)

[Claims] 1. Constructed so that the powdered fertilizer sent out from the feeding mechanism 12 falls into the fertilization groove of the field via the hose 13 and the groove cutter 14, and
Electrodes 23 and 24 are provided inside the groove creator 14,
Both electrodes 2 remove the fertilizer that adheres and accumulates inside the trencher 14.
This is a clogging sensor for a fertilization device that detects based on a change in the electrical resistance value between the electrodes 23 and 24. A clogging sensor for a fertilizer application device located in a space.