JPS6345857Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a seeding machine equipped with a feeding roller that sequentially feeds a certain amount of seeds from a seed tank and supplies them to a seeding section. The present invention relates to a missing broadcast detection device that reliably detects the missing broadcast and issues an alarm.

Conventionally, flooded direct sowing machines for paddy fields are equipped with a feeding roller that sequentially feeds out a certain amount of seeds from a seed tank, and the seeds fed by the feeding roller are delivered to the paddy field surface through a seed feeding pipe. Many of them are configured to be dropped.

By the way, in the above-mentioned seeding machine, the seed feeding tube is made transparent in order to observe the feeding of seeds by the feeding roller and the sowing situation. It is not easy to accurately detect the sowing situation from the amount and the amount of sowing, and especially with riding-type seeders, the sowing unit is attached to the rear of the running unit, so the operator can use the machine as usual. It is not possible to observe the sowing situation from the operating position, which is a hindrance to the work.Furthermore, in order to check the sowing situation, the operator has no choice but to turn around to the rear, making it difficult to steer. There was a risk that the vehicle would become unstable and the straightness and safety of the vehicle would be impaired.

In view of the above-mentioned conventional situation, the present invention aims to eliminate the inconveniences, and is to provide a photoelectric sensor that is placed opposite the seed delivery surface of the delivery roller to detect the presence or absence of seeds to be delivered. and a position sensor whose seed receiving part corresponds to the photoelectric sensor in conjunction with the rotation of the feeding roller, and a detection system that issues an alarm on the condition that the photoelectric sensor does not detect the presence of seeds when the position sensor is activated. By providing an alarm circuit, the presence or absence of seeds being fed out by the feeding roller is constantly detected in synchronization with the feeding pitch, and an alarm can be immediately issued if there is a failure in seed feeding by the feeding roller. Therefore, it is an object of the present invention to provide a seeding failure detection device for a seeding machine that can reliably detect the occurrence of seeding failure.

The structure of the present invention will be described with reference to an embodiment shown in the drawings. The drawings show a riding-type paddy field direct sowing machine as an example of a seeding machine, and in Fig. 1,
Reference numeral 1 denotes a traveling section, and 2 a seeding machine.The seeding machine 2 is attached to the rear of the traveling section 1 and is towed. 3 is the driving control panel, 4 is the driving handle, 5
is the driver's seat. 6 is a seed tank, a seed feeding section 8 is connected to a seed feeding port 7 at the lower end of the seed tank 6, and a seed feeding pipe 10 extending downward is connected to a seed feeding port 9 of the seed feeding section 8. It is connected. As shown in FIG. 2, the seed dispensing section 8 has a built-in dispensing roller 11 with a black surface.
The outer periphery of the seed delivery surface of the delivery roller 11 is covered with a transparent delivery guide plate 12. On the outer peripheral surface of the feeding roller 11, seed receiving portions 13 for feeding out a certain amount of seeds are formed at fixed rotation angles.
A protrusion 17 for operating the switch is provided protrudingly provided at the rear with respect to the rotational direction of the switch 1 . 15 is a rotating shaft of the feeding roller 11, and the rotating shaft 15
is interlocked with a power take-off shaft 18 of the traveling section 1 via a roller drive chain 16 and a transmission mechanism 17.
19 is a float.

The seed feeding section 8 is provided with a photoelectric sensor 20 for detecting the presence or absence of seeds to be fed by the feeding roller 11, and a position sensor 21 for detecting the detection position thereof. That is, the photoelectric sensor 20 integrates a light-emitting element (light-emitting diode) and a light-receiving element (phototransistor), and when a light beam emitted from the light-emitting element is reflected by another object and enters the light-receiving element, the conductive element It acts to conduct electricity. Then, the photoelectric sensor 2
0 is attached to a transparent feeding guide plate 12 of the seed feeding section 8. Further, the position sensor 21 is a limit switch, and the position sensor 21 is attached to a portion of the feeding guide plate 12 where the seed receiving portion 13 of the feeding roller 11 comes into contact with the protrusion 14 at a position corresponding to the photoelectric sensor 20. . These photoelectric sensor 20 and position sensor 21 are connected to a detection alarm circuit shown in FIG.

In FIG. 3, 22 is a NOR circuit, and one input side of the NOR circuit 22 has a NOT circuit 23.
The position sensor 21 is connected via
A NOT circuit 24 is connected to the other input side of the NOR circuit 22.
A photoelectric sensor 20 is connected via. Although not shown in the drawings, the same photoelectric sensors as the photoelectric sensor 20 are provided in the seed feeding portions of each of the plurality of sowing rows, and Noah circuits 25, 26, and 27 correspond to the photoelectric sensors. provided,
The position sensor 21 is connected to one input side, and the note circuits 28 and 2 are connected to the other input side.
Each photoelectric sensor is connected via 9 and 30. Further, 31 is an OR circuit, and each of the NOR circuits 22, 25, 2 is connected to the input side of the OR circuit 31.
6 and 27 are connected, and the output side is connected to the alarm lamp 3 via the monostable multivibrator 32.
It is connected to the circuit No. 3. 34 is a power source, 35 is a power switch, 36 is a voltage adjustment circuit for the photoelectric sensor 20 and position sensor 21, and 37 is a Darlington-connected transistor. Warning lamp 3
3 is installed at the front of the traveling section 1 at a position where the operator can easily see it, as shown in FIG. Note that an alarm buzzer may be provided in place of the alarm lamp 33, or both may be provided together.

FIG. 5 shows another example of the one described above. In other examples, the feeding roller 1
A brush 38 is installed on the seed dispensing surface of 1, and this brush 38 wipes the inner surface of the transparent seed dispensing guide plate 12, that is, the active surface of the photoelectric sensor 20, by the rotation of the dispensing roller 11. . Also,
The feeding roller 11 has a brush 3 on its seed feeding surface.
8 and a rotating brush 39 for wiping the seed receiving portion 13 are provided opposite to each other. .

In the seeding machine constructed as described above, the seeds in the seed tank 6 enter the seed receiver 13 as the seed feed roller 11 rotates, and a certain amount of seeds are fed out. Then, a certain amount of the seeds are fed out from the seed feeding port 9 of the feeding section 8 to the seed feeding pipe 1.
0 and then sent to the seeding position where the seeds are sown.

By the way, the presence or absence of a certain amount of seeds to be fed out by the feeding roller 11 is determined by a photoelectric sensor 20.
, and the detected positions are simultaneously detected by the position sensor 21. That is, when the seed receiver 13 reaches a position corresponding to the photoelectric sensor 20 due to the rotation of the feeding roller 11,
If a seed exists in the seed receiver 13, the light emitted from the light emitting element of the photoelectric sensor 20 is reflected by the seed coded with white calcium peroxide or the like as an oxygen generating agent and enters the light receiving element. ,
The light receiving element becomes conductive. Furthermore, in the unlikely event that there are no seeds in the seed receiver 13, the light emitted from the light emitting element of the photoelectric sensor 20 is absorbed by the black roller, and the seed receiver 13 is recessed and separated from the light receiver. Since the light does not enter the light receiving element, the light receiving element is maintained in a non-conducting state. Thereby, the presence or absence of a certain amount of seeds to be fed out by the feeding roller 11 is detected,
When the seeds are missing, a warning lamp 33 (described later)
can be turned on to notify the worker of an abnormality.

Hereinafter, the above operation of the detection alarm circuit shown in FIG. 3 will be explained in detail.

First, when starting the sowing operation, the power switch 35 is closed, and when the seed receiver 13 reaches a position corresponding to the photoelectric sensor 20 due to the rotation of the feeding roller 11, the protrusion 14 is placed on the position sensor 21. contact and close the contact, so point A becomes a high potential, and point B, which passes through the knot circuit 23, becomes a low potential.
If a certain amount of seeds are present in the seed receiver 13 of the feeding roller 11 at the time when the detection position is detected by the position sensor 21, the light receiving element of the photoelectric sensor 20 becomes conductive, so the output of the knot circuit 24 is Side C point has a high potential. Therefore, one input side of the NOR circuit 22 has a low potential, the other input side has a high potential, and its output side D has a low potential. In addition, if the other feeding rollers are feeding out a certain amount of seeds normally, the Noah circuits 25, 26, 2
Since the output sides of 7 are both at low potential, the OR circuit 3
1 is held at a low potential, and its output side point E is at a low potential, so it is not input to the monostable multivibrator 32, and no output is output to the output side point F. Therefore, the Darlington-connected transistor 37 in the circuit of the alarm lamp 33 does not conduct.
Although the ground-side point G of the alarm lamp 33 is held at a high potential, the alarm lamp 33 does not light up.

On the other hand, if a certain amount of seeds that should be fed out by the feeding roller 11 are missing, the photoelectric sensor 20
The light-receiving element of
4, the C point becomes a low potential, so the NOR circuit 22
The inputs of both are at low potential, and the output side D is at high potential. For this reason, one of the inputs of the OR circuit 31 becomes a high potential, so the output side point E also becomes a high potential. Then, this becomes a trigger signal for the monostable multivibrator 32, and a high potential pulse with a constant width t is generated at the output side F point. The potential at point G on the ground side decreases, and the alarm lamp 33 lights up. As a result, the operator can immediately and reliably know that a failure has occurred due to a failure in feeding out the seeds. Note that the OR circuit 31 is activated not only when a drop occurs in the feeding of seeds by the feeding roller 11, but also when a certain amount of seeds that should be fed are missing from at least one of the other feeding rollers. Since at least one of the inputs has a high potential, its output side point E has a high potential, and the alarm lamp 33 similarly lights up for a certain period of time t to notify the occurrence of an abnormality.

FIG. 4 shows a potential time chart at points A to G of the detection alarm circuit, and m
is the point at which missing seeds were detected, t is the pulse width in the monostable multivibrator 32 and the alarm lamp 3
3 lighting time is shown.

As shown in this potential time chart, the period of detection of the presence or absence of seeds by the photoelectric sensor 20 is determined by the seed feeding pitch determined by the rotational circumferential speed of the feeding roller 11, but the detection time point of the photoelectric sensor 20 is
Since it is detected by the position sensor 21 that is linked to the feeding roller 11, no other circuit for defining the detection period is required, and a synchronization circuit between it and the feeding roller 11 is also unnecessary. Therefore, the configuration of the detection alarm circuit can be greatly simplified, and the detection period of the photoelectric sensor 20 is detected in safe synchronization with the position sensor 21 linked to the feeding roller 11. There is no risk of detection errors.

In the other example shown in FIG.
8 and the seed receiver 13 are also wiped by the rotating brush 39, preventing malfunctions caused by stains on the working surface of the photoelectric sensor 20, clogging of seeds, or whitening of the seed receiver 13 by coating powder. This can further improve detection accuracy.

In summary, the present invention provides a seeding machine equipped with a feed-out roller that sequentially feeds a certain amount of seeds from a seed tank and supplies them to a seeding section, and the seeds to be fed out are placed opposite the seed feed-out surface of the feed-out roller. A photoelectric sensor for detecting the presence or absence of seeds is provided, and a position sensor whose seed receiving portion corresponds to the photoelectric sensor in conjunction with the rotation of the feeding roller is provided, and it is ensured that the photoelectric sensor does not detect the presence of seeds when the position sensor is activated. Because we installed a detection alarm circuit that issues an alarm as a condition,
It is possible to constantly detect the presence or absence of seeds being fed out by the feeding roller in synchronization with the feeding pitch, and to immediately issue an alarm when a failure occurs in the feeding of seeds by the feeding roller, thereby preventing the occurrence of seeding failure. This has extremely useful practical effects, such as being able to reliably sense the

[Brief explanation of the drawing]

The drawings show an embodiment of the missing seeding detection device in a seeding machine according to the present invention, in which FIG. 1 is an overall side view of the seeding machine, FIG. 2 is a vertical side view of main parts, and FIG.
FIG. 4 is a circuit diagram showing an example of the detection alarm circuit, FIG. 4 is a potential time chart at each point of the same, and FIG. 5 is a longitudinal sectional side view of a main part showing another embodiment. In the figure, 1 is a traveling part, 2 is a seeding machine, 3 is an operation panel, 5 is a driver's seat, 6 is a seed tank, 8 is a seed delivery part, 9 is its seed delivery port, 10 is a seed delivery pipe, 1
1 is a feeding roller, 12 is a transparent feeding guide plate, 13
14 is a projection, 15 is a rotating shaft, 16 is a roller drive chain, 17 is a transmission mechanism, 18 is a power take-off shaft, 20 is a photoelectric sensor, 21 is a position sensor,
22 is a NOR circuit, 23 is a NOT circuit, 24 is a NOT circuit, 31 is an OR circuit, 32 is a monostable multivibrator, 33 is a warning lamp, 34 is a power supply, 3
5 is a power switch, 36 is a voltage adjustment circuit, 38 is a brush, and 39 is a rotating brush.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a seeding machine equipped with a feeding roller that sequentially feeds a certain amount of seeds from a seed tank and supplies them to a sowing unit, the seeds are fed out facing the seed feeding surface of the feeding roller. a photoelectric sensor that detects the presence or absence of seeds; and a position sensor whose seed receiver corresponds to the photoelectric sensor in conjunction with the rotation of the feeding roller, and when the position sensor is activated, the photoelectric sensor detects the presence of seeds. 1. A missing seeding detection device for a seeding machine, characterized in that it is provided with a detection alarm circuit that issues an alarm on the condition that no seeding occurs. (2) Claim 1 of the utility model registration, characterized in that the feeding roller has a brush on its seed feeding surface for wiping off the active surface of the photoelectric sensor.
2. Missing seeding detection device in the seeding machine described in 2. (3) Missing seeding in the seeding machine according to claim 2 of the utility model registration claim, characterized in that the feeding roller is provided with a rotating brush that rotates together with the seed feeding roller and wipes the seed feeding surface thereof. Detection device.