JP4806851B2 - Particulate matter detection device such as seeding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a particulate matter detection device such as a seeder.
[0002]
[Prior art]
There is one that detects a particulate matter by arranging an optical particulate matter sensor composed of a light emitting element and a light receiving element so as to face a flow path of the particulate matter such as a seed of a seeder.
[0003]
[Problems to be solved by the invention]
In the conventional apparatus, when the granular material flows down relatively slowly, it can be accurately detected. However, in the high efficiency type seeder that accelerates the granular material and flows down at high speed, the detection accuracy is high. There was a problem that it decreased. Thus, the present invention is intended to solve such problems.
[0004]
[Means for solving problems]
The invention of claim 1 for solving such a technical problem is such that the detection electrode portion (41a) of the particulate matter sensor (41) is disposed opposite to the flow passage of the particulate matter such as a seeder, and the detection electrode portion. (41a) is configured to detect the particulate matter based on the change in capacitance of the particulate matter passing through, and the detection signal of the detection electrode portion (41a) of the particulate matter sensor (41) is amplified by the amplification means (42), Next, a particulate matter detection apparatus such as a seeding machine is characterized in that the peak hold means (43) outputs a peak value amplification signal to detect passage of the particulate matter .
[0005]
[Action and effect of the invention]
According to the first aspect of the present invention, even if the detection value of the capacitance changes due to an object existing in the vicinity when the granular material passes through the detection electrode portion 41a of the granular material sensor 41, the reference detection value fluctuated depending on the peripheral object. Since the passage of the particulate matter is detected based on the amount of change in the electrostatic capacity based on the particulate matter, the particulate matter can be detected with high accuracy.
[0006]
Further , the detection signal of the detection electrode portion 41a of the granular material sensor 41 is amplified by the amplification means 42, and then the peak hold means 43 outputs a peak value amplification signal to detect the passage of the granular material. Even if the surroundings of the sensor fluctuate due to adhesion, etc., the particulate matter can be detected with high accuracy by a small change in the detection value .
[0007]
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 shows a fertilizer seeder 2 equipped with a fertilizer application device 1 for applying granular fertilizer to a seeder that sows seed rice directly in a paddy field. This fertilizer sowing machine 2 is mainly composed of a riding type traveling vehicle body 3, a fertilizer application device 1 for 8 strips, and a seeding device 4.
[0009]
The traveling vehicle body 3 includes left and right front wheels 5 and 5 and left and right rear wheels 6 and 6. Front wheel final cases 8, 8 are provided on the left and right sides of the transmission case 7 arranged at the front of the aircraft, and the left and right front wheels 5, 5 are projected on the front wheel shaft protruding laterally from the lower portion of the front wheel final cases 8, 8. 5 is attached. Further, the front end of the main frame 9 is fixed to the rear portion of the transmission case 7, and the rear wheel gear cases 10 and 10 can be freely rolled around the center of the rear end of the main frame 9 with the horizontal rear wheel rolling shaft as a fulcrum. The left and right rear wheels 6 and 6 are attached to a rear axle that supports and projects laterally from the rear wheel gear cases 10 and 10.
[0010]
The engine 11 is mounted on the main frame 9, the rotational power is taken out to the engine output shaft protruding from the left side surface of the engine 11, and this rotational power is transmitted to the drive shaft of the hydraulic pump 12 a via the first belt transmission device 12. Furthermore, the transmission is transmitted to the transmission case 7 via the second belt transmission 13 capable of continuously variable transmission.
[0011]
The rotational power transmitted to the transmission case 7 is shifted by a main transmission (not shown) in the case, branched into driving power and work equipment power, and taken out to the left via the front wheel final cases 8 and 8. The power is transmitted to the right front wheels 5 and 5 and is also transmitted to the left and right rear wheels 6 and 6 via the rear wheel gear cases 10 and 10. Further, the work machine power is taken out from the PTO shaft and transmitted to the fertilizer application apparatus 1, and further transmitted to the seeding device 4 through the bendable work machine transmission shaft 15 to drive the operating portion.
[0012]
An upper portion of the engine 11 is covered with an engine cover 16, and a cockpit 17 is provided on the engine cover 16. A handle 18 for steering the left and right front wheels 5 and 5 is provided in front of the cockpit 17.
An elevating link device 19 is provided at the rear of the traveling vehicle body 3. The elevating link device 19 has a parallel link configuration, and includes an upper link 19a and a pair of left and right lower links 19b and 19b. The base side of these links 19a, 19b, 19b is pivotally supported by a front link frame 20 erected on the rear end of the main frame 9, and the rear link frame 21 is attached to the front ends of the links 19a, 19b, 19b. Are connected. The seeding device 4 is mounted on the post-link frame 21 so as to be able to roll.
[0013]
A hydraulic elevating cylinder 23 is interposed between the support member fixed to the main frame 9 and the tip of the swing arm 22 integrally formed with the upper link 19a. The hydraulic elevating cylinder 23 is expanded and contracted by hydraulic pressure, and the upper link 19a is extended. The seeding device 4 that is pivoted up and down and connected to the post-link frame 21 is moved up and down in a substantially constant posture. The hydraulic lift cylinder 23 is extended and contracted by a hydraulic lift valve (not shown) provided on the traveling vehicle body 3.
[0014]
The fertilizer applicator 1 provides a fertilizer hopper 24 that stores granular fertilizer, a plurality of fertilizer feed sections 25 that feed out the fertilizer in the fertilizer hopper 24 by a predetermined amount, and guides the fertilizer fed from the fertilizer feed section 25 to flow down. A plurality of fertilizer guide tubes 26, a fertilizer air chamber 27 that supplies pressure air to the fertilizer guide tubes 26, and a fertilizer blower 28 that supplies pressure air to the fertilizer air chamber 27 are provided.
[0015]
Then, the fertilizer applying apparatus 1 drops and supplies the fertilizer fed from the fertilizer feeding section 25 to the fertilizer guide pipe 26, and the fertilizer guide pipe 26 ... and a plurality of second fertilizer guide pipes 26a by the pressure wind from the fertilizer air chamber 27. It is the structure which sends a fertilizer to the multiple fertilizer application part 29 ... via ....
[0016]
The fertilizer application section 29 is connected to the fertilizer guide pipes 26a through boots 30, and is attached to a leveling float 31 that slides on a farm scene. A structure in which a fertilizer groove 32 is provided in front of the fertilizer 29, the groove is formed by the fertilizer groove 32 as the machine advances, and fertilizer is supplied from the fertilizer 29 and covered with a fertilizer cover (not shown). It is.
[0017]
Next, the sowing apparatus 4 will be described.
Below the seeding device 4, two center leveling floats 31a, ... and left and right side leveling floats 31b, ... are provided, and these leveling floats 31a, ..., 31b, ... have a front-back inclined posture. It is a configuration that can be freely changed, and is configured to make the field scene gliding during seeding work.
[0018]
The seeding unit of the seeding device 4 includes a seed hopper 34 for storing seeds, a plurality of seed feeding units 35 for feeding seeds in the seed hopper 34 by a predetermined amount, and a plurality of strips for guiding the seeds fed from the seed feeding unit 35 to flow down. Seed guide pipes 36, seed release devices 37 that receive seeds fed into the seed guide tubes 36, and accelerate and release them downward, and seeds accelerated and released from the seed release devices 37 It is comprised by the seed guide body 39 ... etc. which guide to the groove producing device 38 ....
[0019]
41 is a seed sensor (granular substance sensor) for detecting the falling of seeds, and is provided in the seed guide part 40 at the upper part of the sowing groovers 38. Thus, when the seed guide unit 40 is clogged with mud or seeds, or when seeds are clogged and cannot be fed out in the upper seed feeding unit 35, it is detected that the seeds are not sowed. This is to issue an alarm to the driving panel in front of the person. When this alarm is issued, the operator immediately stops the aircraft, checks and maintains the abnormal part, and resumes the sowing work.
[0020]
With the above-described configuration, the seed discharge device 37 in which the seeds fed from the seed feeding unit 35 are arranged near the upper part of the sowing grooving device 38 is received once and released while being accelerated downward sequentially, and the seeds are intermittently introduced into the field. Sowing and seeding work in the spot sowing state can be performed well.
[0021]
Next, another embodiment of the seed sensor (granular substance sensor) 41 will be described with reference to FIG.
A seed sensor 41 is arranged in the seed flow path, a change in electrostatic capacitance of a granular material such as a seed is detected by the detection electrode portion 41a of the seed sensor 41, and a peak value in the analog signal of the detected voltage value is amplified. It has a function of holding and outputting as a detection signal.
[0022]
As shown in FIG. 4 (1), the detection signal A of the seed sensor 41 is input to the control unit built in the CPU via the amplifier circuit 42 and the peak hold circuit 43. As shown in FIG. 4 (2), the voltage value A is detected by the detection electrode portion 41a of the seed sensor 41 and sent to the amplifier circuit 42. The amplifier circuit 42 amplifies the peak voltage value B, and then the peak hold circuit. In 43, the peak value amplification signal C is output as a detection signal to detect the passage of seeds.
[0023]
When the seed passes through the detection electrode portion 41a of the seed sensor 41, the detected capacitance value varies depending on the surrounding objects, but in this embodiment, the variation in the detected capacitance value varies depending on the surrounding circumstances. Since the soot particles are detected based on the amount, the particulate matter can be accurately detected even if dust, moisture, or the like adheres and the surrounding conditions of the sensor change.
[0024]
In addition, as shown in FIG. 5, in the seed sensor 41 that detects the passage of seeds such as pods by changing the capacitance as described above, the detection electrode portion 41a may be covered with the shield film 44.静電 Capacitance that changes with each grain is very small, and if there is an object around it, the electric field changes and the output signal also changes. However, by shielding the detection electrode portion 41a of the seed sensor 41 as described above, such problems can be solved and detection accuracy can be improved.
[0025]
Next, another embodiment of the seed sensor 41 will be described with reference to FIG.
A seed sensor 41 is arranged in the seed discharge flow path, the capacitance of the seed is detected by the detection electrode portion 41a of the seed sensor 41, and the peak value and the bottom value in the analog signal of the detected voltage value are detected. Is output as a detection signal.
[0026]
As shown in FIG. 6 (1), the detection signal of the seed sensor 41 is input to the control unit built in the CPU via the peak bottom detection circuit 45 and the peak hold circuit 43. In the detection electrode portion 41a of the seed sensor 41, the voltage value A is detected as shown in FIG. 6 (2), and the peak voltage value and the bottom voltage value are detected. Next, the peak / bottom detection circuit 45 detects the peak value and the bottom value as shown in FIG. 6 (3), and then the peak hold circuit 43 detects the peak hold signal and the bottom as shown in FIG. 6 (4). A hold signal is output to detect the passage of seeds.
[0027]
The speed of the seed (or granular fertilizer) flowing down the flow passage is about 25 km / h, and the pulse width of the pods is very short, about 1 millisec. In this embodiment, since the peak voltage value and the bottom voltage value due to the passage of the pods are detected and detected as amplified voltage values, the passage of the pods can be detected with a short processing program, and the periphery of the seed sensor 41 can be detected. Even if the moisture or dust state fluctuates, it is detected based on the peak voltage value and the bottom voltage value that have changed based on the reference voltage value, so that it is possible to accurately detect the fast-moving granules.
[Brief description of the drawings]
FIG. 1 is a side view of a body of a fertilizer seeding machine.
FIG. 2 is an overall plan view of a fertilizer seeding machine.
FIG. 3 is a partially cut side view of the seeding device.
FIG. 4 is a block diagram of a main part and a time chart of detection signals.
FIG. 5 is a perspective view and a cut-out plan view of the main part.
FIG. 6 is a block diagram of a main part and a time chart of detection signals.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fertilizer 2 Fertilizer seeder 3 Car body 4 Seeder 41 Seed sensor (granular substance sensor)
41a Detection electrode part 42 Amplifying circuit (amplifying means)
43 Peak hold circuit (peak hold means)
45 Peak bottom detection circuit (peak bottom detection means)

Claims (1)

The detection electrode part (41a) of the granular substance sensor (41) is arranged opposite to the flow path of the granular substance such as a seeder, and the granular substance is based on the change in the capacitance of the granular substance passing through the detection electrode part (41a) . The detection signal of the detection electrode part (41a) of the granular material sensor (41) is amplified by the amplification means (42), and then the peak value amplification signal is output by the peak hold means (43). A particulate matter detection device such as a seeder, which detects passage of particulate matter .

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