JPH0462682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sensor for a fertilizer applicator installed in, for example, a rice transplanter. A fertilizer application device configured to drop and supply fertilizer into a fertilizer trench in a field through a container, and to detect fertilizer adhering to and depositing in the trencher based on a change in electrical resistance between electrodes. Concerning the blockage sensor.

[Prior art] As a clogging sensor for this type of fertilizer application device,
One electrode is connected to the groove maker main body and grounded, and the other electrode is supported in the form of a protrusion by an insulator thinly attached to the inner wall of the groove maker.
It is possible to electrically detect clogging of fertilizer that occurs in the trencher by checking the degree of adhesion of fertilizer on the insulator.

In other words, due to the adhesion of fertilizer on the insulator, conduction occurs between the trench cutter body and the electrode, and the electrical resistance between the two decreases.If the accumulation of fertilizer progresses further and the resistance value 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, such as when fertilizing at the same time as rice planting or direct seeding, muddy water splashed up during the operation may adhere to the insulator, or water vapor from below may When dew condenses on the insulator, the moisture becomes a water film,
Even if there is no fertilizer clogging due to electrical conduction between the trencher body and the electrode, a detection signal is erroneously output.

The present invention has focused on such a situation and aims to prevent false detection by the sensor due to conduction due to a water film by simply modifying the electrode structure of the sensor.

[Means for solving problems]

A characteristic feature of the present invention, which has been made to achieve the above object, is that the electrode is disposed in the space within the groove cutter via an insulated small-diameter arm, and is movable for vertical adjustment.

[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 instead falls as water droplets, which cannot result in false detection. Moreover, since the electrode can be adjusted and moved, it can be adjusted to the height position where fertilizer is most likely to adhere.

〔Effect of the invention〕

As a result, it has become possible to prevent false detections due to moisture adhesion and to accurately detect fertilizers.

〔Example〕

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

As shown in FIG. 1, a riding-type rice transplanter is constructed by connecting a seedling planting device A 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. There is.

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 pine-shaped seedlings W are mounted, and a planting arm that plants seedlings from the seedling platform 6 one by one onto a field. 7..., 5 with multiple soil leveling floats 8 etc. installed in parallel in the left and right direction of the seedling planting device A.
The seedling planting device A is configured for row planting, and is further equipped with a fertilization device B that sends fertilizer to the field during seedling planting operation.

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

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, 12 on the upper surface.
The cylindrical body 12b has a cylindrical shape 12a, and the swinging force of the link mechanism 15 that sets the operating locus of the planting arm 7 is transmitted through the rod 16, so that the planting arm 7 swings reciprocatingly around the left-right axis. Recesses 12a, 12
It operates in such a way that the fertilizer that has entered the tank is distributed and dropped in both 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. The groove cutting device 14 is attached to the earth leveling float 8 so that its height can be adjusted by connecting the rear bracket 18 of the groove cutting plate 19 with a slotted bolt. And groove maker 1
4 to the hose 13, connect the upper end to the hose 1
3, and a bellows 27 is placed over the upper end opening 14a, and the bellows 28 and the O-ring 29 fitted onto the hose 13 work together to transmit the groove through the hose 13 and open the groove cutter 14. It is designed to prevent moisture from entering the interior.

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.
4b via screws 20, 20, a small diameter arm 22 protruding downward from this insulator 21, a positive electrode piece 23 attached to the tip of the arm 22, together with the insulator 21. A negative electrode piece 24 that also serves as a lug terminal is tightened and fixed to the groove creator 14 by the screw 20.
It is equipped with The arm 22 has a sensor S
Metal core wire 2 connected to the positive side cord 25 of
7 is coated with an insulating resin, and is inserted and held in the insulator 21 so that its protrusion degree can be changed.As shown in FIG. The electrode pieces 23 are screwed in a replaceable manner so that the electrode pieces 23 are present in the groove forming device 14 in a dotted manner. In addition, this positive side electrode piece 2
A suitable gap is provided between 3 and the groove cutter 14 to prevent water droplets from intervening and causing electrical conduction between the two.

The positive side cord 25 and the negative side cord 26 are connected to a detection circuit (not shown), and this detection circuit converts the electrical resistance value into a voltage value, and compares it with a reference voltage value to detect a lower voltage value. If so, a detection signal is output and the lamp L is turned on. 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 furrow cutter 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, and one of them may support the positive side electrode piece 23 and the other side support the negative side electrode piece 24. .

Note that although numbers are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of a clogging sensor for a fertilization device according to the present invention, in which FIG. 1 is a vertical side view of the fertilization device, FIG. 2 is a cross-sectional plan view of main parts, FIG. 3 is an enlarged view of the arm, The figure is an overall side view of the rice transplanter. 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
Fertilizer that adheres and accumulates inside the trencher 14 is transferred to the electrode 2.
This is a clogging sensor for a fertilizer device that detects based on a change in electrical resistance value between 3 and 24, and the electrode 23 is connected to an insulated small diameter arm 2.
The clogging sensor of the fertilization device is located in the space inside the groove maker 14 via the groove maker 2 and is movable up and down.