JPS596604B2 - Constant plant spacing device in rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for maintaining a constant planting interval in a rice transplanter, regardless of changes in slip ratio.

Conventionally, plant distance constant devices have attempted to maintain a constant plant spacing by increasing or decreasing the number of rotations of the planter depending on the amount of descent of the paddy wheel.

This does not directly affect the distance between plants11, but is based on the indirect result that the deeper the plow and the lower the paddy wheels, the greater the running resistance and the higher the slip rate. Even if the amount of fall is constant, the slip rate may change depending on the field conditions such as the presence or absence of water.
With the above-mentioned device, it was not possible to accurately keep the distance between plants constant.

Therefore, the present invention measures the position of the previously planted seedlings at the timing of planting the seedlings with a planter, directly measures the distance between the currently planted seedlings and the previously planted seedlings, and calculates the measured distance and the set distance between the seedlings. In comparison, the object of the present invention is to provide a constant plant spacing device for a rice transplanter that can accurately, reliably, and quickly respond to any field situation by controlling the rotational speed of the planter.

Hereinafter, embodiments embodying the present invention will be described along with the drawings.

The rice transplanter 1 has a body 5 that is swingably suspended by paddy wheels 2 and a float 3, as shown in FIGS. 1 and 2.

An engine 6 is mounted on the front of the fuselage 5, and a planter γ is disposed at the rear. A handle 9 is fixedly attached to the fuselage 5 so as to extend further rearward. A seedling stand 11 is movably supported.

Further, as shown in FIG. 3, the engine 6 is transmitted to the chains in the left and right swing cases 15 via the transmission device 13 in the mission case 12, and further transmitted to the left and right paddy wheels 2. together with the second shaft 1 of the transmission 13
6 protrudes outside the case 12, and is transmitted to a transmission device 20 within the planting portion transmission case 19 via a continuously variable transmission device 1γ.

The transmission device 20 transmits power to a planter drive shaft 21 having a planter γ, and further transmits power to a napier screw 22 that reciprocates the seedling stand 11 from side to side.

On the other hand, the engine 6 is connected to the pump 25 via the belt 23.
The pump 25 is in communication with the hydraulic cylinder device 2γ via a solenoid valve 26.

The continuously variable transmission 1γ, as shown in FIGS. 4 and 5,
Input side gear shift boolean 29 biased by spring 2γ
and a fixed sheave 30a fixed to a shaft and a movable sheave 30b operated by a piston rod 2γa of a hydraulic cylinder device 2γ via a thrust bearing 31.
A belt 31 is wound between 9 and 30, and a tension pulley 32 is in contact with the belt 31.

On the other hand, as shown in FIG. 6, the planter drive shaft 21 is provided with a protrusion 21a, and a microswitch 33 is still fixedly installed adjacent to the drive shaft 21, and the peak of the tip of the planter γ is shown by the chain line. The timing is adjusted so that the protrusion 21a contacts the switch 33 and closes the moment the seedling 36 on the seedling stand 11 is planted on the rice field 31 (planted on the rice field 31) while drawing a trajectory 35.

Furthermore, as shown in detail in FIGS. 6 and γ, the float 3
It is located slightly behind Keiya 35 of Beak 1a,
That is, the seedlings 36 that were just scraped and planted by the peak γa
A light receiving section 40 consisting of a large number of analyzers 40a constituting the seedling detection/control device 39 is arranged over a predetermined length so that the light receiving section 40a is not detected. A light emitting section 42 is disposed so that the bracket 41 is used to pluck the seedlings 36a.

The seedling detection/control device 39 is connected as shown in FIG.

The electric circuit consists of a detection section 43, a judgment circuit section 45, and a control circuit section 46, and in the case of this embodiment, three types are selected by a changeover switch 4γ disposed on the handle 9 as the appropriate stock interval.
For example, 1 4 (cm) a, 1 7 (cm) b
, 20 (cm) c.

That is, assuming that the upper part of the drawing is the front of the machine, among the many analyzers 40a of the light receiving unit 40, the positions a, b,
c Outputs 49a, 49b, 4 from the analyzer located at the rear
9c serves as a reference, and these are each directly input to the AND gate 50.

In addition, the distance L(a,
a(L(b,b(L(c,c(L) is O
They are combined by an R gate 51 to form one output, and each is input to an AND gate 50.

On the other hand, the output of the microswitch 33 operated by the protrusion 21a of the planter 1 drive shaft 21 is transmitted to the waveform shaping circuit 52.
It is connected to each AND gate 50 as an input to provide timing for position detection.

In addition, the seedling to be detected is the seedling 3 planted by planter 1 last time.
6b, if there are a plurality of seedlings within the light receiving section 40, only the most forward seedling must be detected.

Therefore, the output of the AND gate 50 is transmitted via the NOT gate 53 to the analyzer 40a located behind the gate.
It has 500 AND gate inputs for output.

As a result, only the AND gate 50 into which the output from the analyzer corresponding to the seedling 36b located at the front is input will output "1", and the others will output "0".

Further, the output from the AND gate 50 is classified correspondingly between set stocks.

For example, when b is selected as the set strain interval using the changeover switch 4γ, the analyzer 40a located at distance L<b...
・The outputs from 49b are combined into one output by the OR gate 55, and the output 49b is output as is, and the distance L
The signals from the analyzers 40a located at points 40a, . . .
1'' is output to the changeover switch 4γ.

Note that since there is only one output "1" from the AND gate 50, two outputs will not become "1" at the same time.

Furthermore, when the plant spacing is set to a or b, the data are output together in the same way.

Further, the outputs from each of the AND gates 50 are negated 56a and input to the AND gate 56, and if there are no seedlings within the range of the light receiving section 40, all outputs from the AND gates 50 are "0". The output of all these "0" is negated and becomes "1", so AN
The output of the D gate 56 becomes 11'', which is output to the OR gate 57 which controls the solenoid 26a of the valve 26 to increase the rotation speed of the planter.

The output from the changeover switch 4γ is also input to the OR gate 5γ, and its output is connected to the latch circuit 59.

Similarly, the changeover switch 4 is also placed on the side that controls the solenoid 26b of the valve 26 to slow down the planter rotation speed.
The output from γ is input to the latch circuit 59.

These latch circuits 59 pass the output from the switch 33 through a one-shot multivibrator 60 to receive a short pulse signal as a clock input, and the latch circuit 59 allows the output from the switch 41 etc. to be used as a clock input next time. It will remain in that state until.

Further, the latch circuit output is amplified by the amplifier circuit 61 to control the respective solenoids 26a and 26b of the valve 26, and the changeover switch 4101 is grounded through a resistor and does not operate the valve 26.

Since the present invention has the above configuration, the engine 60
The rotation is transmitted to the paddy wheel 2 via the transmission device 13 to move the rice transplanter 1 forward, and the rotation is transmitted from the second shaft 16 to the transmission device 11.
The power is transmitted to the planter drive shaft 21 and napia screw 22 via the transmission device 20, rotates the planter 1 while horizontally feeding the seedling stand 11, scrapes the seedlings 36 and plants them on the field surface 3γ, and further drives the pump 25. The discharged oil is supplied to the hydraulic cylinder device 2γ according to the switching position of the valve 26.

Then, the planter γ rotates to reach the peak γa or the seedling 36a.
When planted on the rice field 31, the protrusion 21a of the planter drive shaft 21 contacts and closes the microswitch 33, and "1" is input to each AND gate 50 via the waveform shaping circuit 12.

The stock opening setting switch 47 is now set to b.
When the previously planted seedlings 36b are in a position narrower than the set distance b, that is, the distance L is in front of the set distance b, L<b, the output from the analyzer 40a, which is in front of the output 49b from the set analyzer, is output. and is input to the AND gate 50 via the OR gate 51 or directly from the output 49a.

As a result, "1" is inputted from both the analyzer 40a and the switch 33, and the AND gate 50 outputs it to the b contact of the changeover switch 41 at the top of the drawing via the OR gate 55, and furthermore, the latch circuit 59 and The solenoid 26b of the valve 26 is energized via the amplifier circuit 61.

Then, the pressure oil from the pump 25 is supplied to one cylinder chamber 27b of the hydraulic cylinder device 2γ, and the piston rod 2γa is extended to slide the town moving sheep 30b toward the stationary sheep 30a via the thrust bearing 31, thereby changing the speed. The effective diameter of the belt 31 of the pulley 30 is increased to shift to a low speed side, and the rotation of the planter 1 is slowed down while keeping the paddy wheel 20 rotations constant.

In this way, the distance between plants L is widened, and the operation described above is continued until L=b, where the previously planted seedling 36b is located on the set analyzer.

When the output 49b is output from the setting analyzer, it is directly output to the b contact of the intermediate changeover switch 4γ and grounded, and the clock input to the latch circuit 59 is also cut off, excitation of the solenoid 26b. is released and the valve 26 is returned to its neutral position.

As a result, the planter 1 rotates at a predetermined speed and plants are planted at the set spacing b.

On the other hand, at the moment when the planter 1 plants the seedlings, if the previously planted seedlings 36b are at a position wider than the set distance b, that is, the distance L is behind the set distance b, L>b, the output 49b from the set analyzer It is output from the analyzer 40a behind the
Powered by ND Kate 50.

As a result, the AND gate 50 to which "1" is inputted from both the analyzer 40a and the switch 33 is outputted to the b contact of the changeover switch 4γ at the bottom of the figure via the OR gate 55, and further to the latch circuit 59. And the solenoid 26a of the valve 26 is energized via the amplifier circuit 61.

Then, the pressure oil of the pump 25 is supplied to the other cylinder chamber 27c of the hydraulic cylinder device 2γ, and the piston rod 27a is contracted and the spring 2γ of the input side speed change pulley 29 is
Based on this, the belt effective diameter of the output side speed change pulley 30 is reduced to shift to the high speed side, and the rotation of the planter γ is increased.

In this way, the distance L between plants is narrowed, and this operation is continued by the latch circuit 59 until the distance L becomes the set distance.

In addition, when the rice transplanter is moved from a field with a high slip rate to a field with a low slip rate, the rotation speed of the planter γ may be significantly slower than the forward speed of the rice transplanter 1, or at the beginning of a new row. , there may be cases where the seedling is not located within the range of the light receiving section 40.

In this case, all AND gates 50 become "0",
Therefore, the AND gate 56 to which the negative signal is input outputs "1", and the valve 260 solenoid 26a is connected via the OR gate 5γ, the latch circuit 59, and the amplifier circuit 61, regardless of the switching position of the changeover switch 4γ. The speed of the transmission 1γ is changed so that the rotation of the excitation flutter γ becomes faster.

Furthermore, even if the seedlings 36c planted before the previous time are located in the light receiving section 40, the AND gate 50 in front outputs "1" due to the seedlings 36b planted in the previous time, and therefore all the AND gates behind it output "1".
Since the negated "0" is input to the gate 50, the AND gate 50 does not output [month] due to the planted seedling 36c.

In addition, although the above explanation was given only for the case where the set gap between stocks is set to b, it goes without saying that the same effect can be achieved when the changeover switch 4γ is switched to a or C and the set gap is set to a or C.

As explained above, according to the present invention, the position of the previously planted seedlings 36b is measured at the timing of planting the seedlings by the planter γ, and the distance between the plants is directly measured, so that the planter γ can accurately and reliably measure the distance between the plants regardless of the field conditions. Can maintain a constant stock spacing,
Furthermore, since the distance between the currently planted seedlings 36a and the previously planted seedlings 36b is detected immediately, control can be performed quickly without any time delay, and it is possible to immediately respond to field conditions.

Since the setting distance can be changed by changing the changeover switch 47, there is no need to replace mechanical devices or sprockets, and the switch 4γ can be changed from the handlebar 9.
It can be installed in a position where it is easy to operate, etc., making it easy to operate and reducing the weight.

Furthermore, since the seedling position is measured without contact, there is no possibility of damaging the seedlings.

In addition, since only the planted seedlings 36b located in the frontmost position of the detection unit 43 are detected, even if the planted seedlings 36c from the previous time are located in the detection unit 43, or if the seedlings are scattered and the plurality of analyzers 40a and Even if the strain spans between ..., it is possible to reliably maintain a certain distance between the strains without causing any malfunction.

Furthermore, since the detection unit 43 is placed slightly behind the position where the planter 1 plants the seedlings, the planter 1 does not detect the seedlings 36a that are currently being planted, and malfunctions due to detection errors do not occur. .

[Brief explanation of the drawing]

Fig. 1 shows the entire side view of a rice transplanter to which the present invention is applied, Fig. 2 is a plan view with the upper part removed, Fig. 3 is a system diagram showing the transmission device, and Fig. 4 is a continuously variable transmission. FIG. 5 is a plan view showing the device; FIG. 5 is a diagram showing the hydraulic circuit that is the operating means; FIG.
The figure is a side view showing the detection section of the seedling detection/control device which is the main part of the present invention, FIG. γ is a rear view thereof, and FIG. 8 is an electric circuit diagram of the seedling detection/control device. 1... To rice planting 2... Wheels, 6... Engine, γ・
...Planter, 1γ...Continuously variable transmission, 36a...
・Planter planted seedlings, 36b...previously planted seedlings, 3
9... Seedling detection/control device, 43... Detection section, 45.
... Judgment circuit section, 46... Control circuit section, L... Between stocks.

Claims (1)

[Scope of Claims] 1. A rice transplanter that transmits the rotation of an engine to wheels and to a planter via a continuously variable transmission device, which includes a detection unit that detects the position of a seedling that was previously planted by the planter; a judgment unit that directly measures the distance between plants by outputting a signal from the detection section in accordance with the timing when the planter plants seedlings, and further compares the measured distance with the set distance; A plant spacing constant device for a rice transplanter equipped with a seedling detection/control device consisting of a control circuit section that emits a signal to control a transmission device. 2. The plant spacing constant device in a rice transplanter according to claim 1, wherein the judgment circuit section is configured to output only the signal from the detection section corresponding to the most forward planted seedling within the range of the detection section. . 3. Claim 1 or 2, wherein the detection unit is located slightly behind the position where the planter plants the seedlings.
A constant plant spacing device in the rice transplanter described in Section 1.