JPS645843B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic direction control device for a combine harvester, and more particularly to the relationship between a direction sensor and a grain culm detection sensor.

Conventionally, grain culm detection sensors have been installed in the grain culm conveyance path by the conveyance chain, and have detected the continuous flow of grain culms and turned on the main switch continuously. Therefore, the grain culm detection sensor is operated completely independently of the direction sensor, so that
During horizontal mowing work with long intervals between grain culms, it was necessary to lengthen the time of the delay timer forming the dead zone, which increased the response delay and resulted in extremely poor control performance.

Therefore, in the present invention, the grain culm detection sensor includes a sensor plate located slightly behind the cutting blade and having a length spanning approximately the entire width of one grain culm introduction path divided by at least a divider. , the main switch is turned on by bringing the sensor plate into contact with a grain culm that has been cut by a cutting blade, and a direction sensor is installed in front of the grain culm detection sensor at a distance of approximately an integral multiple of the inter-row width. During horizontal mowing work, the grain culm detection sensor detects the reaped grain culm and turns on the main switch only in the range where the direction sensor detects the grain culm or in its vicinity, thereby solving the above-mentioned drawbacks. The object is to provide a direction control device.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the combine 1 has a body 3 supported by crawlers 2, and a preprocessing section 5 is supported in front of the body 3 so as to be movable up and down. A large number of dividers 6 are disposed in front of the pre-processing section 5 via divider frames 7, and the uncut side dividers 6
A row cutting sensor 9 is installed on the rear frame 7a of
However, horizontal mowing sensors 10 are respectively installed on the frame 7b of the already mowed side divider 6b. Direction sensor 9, 1 for row mowing and horizontal mowing
0 are sensor bars 9a protruding inward, respectively;
The row mowing sensor 9 has a right side, that is, a cut side direction command switch 9r, and a left side, that is, an uncut side direction command switch 9l.
0 also has a right turn command switch 10r and a left turn command switch 10l. Furthermore, the pre-processing section includes a cutting blade 11 behind each sensor 9, 10.
is installed. As shown in FIGS. 2 and 3, the cutting blade 11 is slightly removed from the grain culm introduction path where the row mowing sensor 9 is located, that is, between the left divider frame 7a and the adjacent frame 7c. A grain culm detection sensor 12 is arranged at the rear. The grain culm detection sensor 12 includes a sensor plate 13 extending across both frames 7a and 7b.
The sensor plate 13 is fixed to shafts 17 and 19 that are rotatably supported by bearings 16 provided on the sensor case 15 and the frame 7b. The shaft 17 serves as a cam 20 within the sensor case 15, and is biased by a spring 21 and a pressing piece 22 to a position where the sensor plate 13 rotates diagonally upward as shown by the dotted line in FIG. Furthermore, the cam 20 can actuate the main switch 25. In addition, in the figure, 26 is a lead wire, and 27 is a lid of the sensor case 15.

Furthermore, as shown in FIG. 4, bidirectional sensors 9 and 10 for row mowing and horizontal mowing are installed in alignment in a direction perpendicular to the direction of movement of the machine, and direction sensors 9 and 10 are used to detect grain culms. It is installed in front of the grain culm detection 29 by the inter-row width L (generally about 30 cm) from the sensor 12. Note that the direction sensor is not limited to the inter-row width L for one row, but also for the two-row width 2L as shown by the chain line.
It suffices if they are installed at a position that is an integral multiple of the inter-row width L.

Next, the control circuit according to this embodiment will be explained based on FIG. This circuit has a main switch 25 connected in series to the power source, and is further operated by a relay R1 activated by a left turn command switch 9l of the row mowing sensor 9 and a left turn command switch 10l of the side mowing sensor 10. Relay R
2 are connected in parallel. Further, a sensor switching circuit C operates a relay R3 in which a relay contact SR1 ₁ is turned on when the relay R1 is energized, a relay contact SR2 ₁ is turned off when the relay R2 is energized, and a timer T ₁ are connected in series. are connected in parallel, and relay R3
The energization causes the relay contact SR3 to switch from the state shown in the figure to the opposite state. i.e. relay contact
SR3 normally has contacts a, c, and e closed and contacts b, d,
f is open, but by energizing relay R3, contacts a, c, and e are switched to open, and contacts b, d, and f are switched to closed. In addition, the delay timer T 2 is activated via the switching contact a of the relay contact SR3 and the right turn command switch 9r of the row mowing sensor 9, or via the switching contact b and the contact SR2 ₂ of the relay R2 _.
It is connected to the. Furthermore, it is connected to the switching contact c or d of the relay contact SR3 via the contact a and the contact _SR12 of the relay R1, or via the switching contact b and the switch 10r of the horizontal mowing sensor 10,
It is also connected to changeover contact e or f of relay contact SR3 via timer contact _ST2 , which is energized and turned on by delay timer _T2 , and operates the clutch of the left drive part of the combine so that it is driven accordingly. The solenoid SlL that operates the clutch of the right drive section is connected in parallel with the solenoid SlR that also operates the clutch of the right drive section. In addition, the timer
As shown in FIG. 6, _T1 is activated and outputs at the same time, and the output is maintained for a certain period of time T so that it continues even after the input is cut off, and as shown in FIG. 3. Delay timer as shown in
_T2 outputs a certain amount of time t after it is activated, and forms a dead zone so that it will not operate even if switches 9l and 10r are turned on between the grain culms. The time is set to a relatively short time depending on the work situation. Also, in the figure
SN is a mid-split changeover switch, which is normally connected to contact g, but is switched to contact h during mid-split work.

Since the present embodiment has the above-described configuration, when the combine 1 enters the row of grain culms and starts reaping work with the cutting blade 11, the lower end of the harvested grain culm is detected by the grain culm detection sensor 12. sensor board 1
The grains are placed and guided on 3 and sent to the rear, and then held in a conveyor chain and conveyed to the threshing machine.
At this time, the grain culm 29' cut by the cutting blade 11
When the sensor board 13 rides on the sensor board 13, the sensor board 13 rotates in the direction of the arrow in FIG. When the combine harvester 1 is in horizontal cutting mode, working in the direction across the rows,
When the main switch 25 is turned on, the row mowing sensor 9 is in contact with the grain culm 29 exactly one row ahead. Further, when the reaped grain culm 29' passes over the sensor plate 13 and the main switch 25 is turned off, the grain culm 29 one row ahead is separated from the direction sensor 9 at this point.

As a result, in the case of horizontal mowing work, the row mowing sensor 9 comes into contact with the grain culm 29 and turns on the left turning command switch 9l, and normally, the left turning command switch 10l of the horizontal mowing sensor 10 is turned on. Since it is in the off position, relay contacts SR1 ₁ , SR2 ₁ and timer
Relay R3 is energized via _T1 . Therefore, the relay contact SR3 is reversely switched from the illustrated state, contacts b, d, and f are turned on, and the direction is controlled by the horizontal mowing sensor 10. That is, when the switch 10r is turned on, the right solenoid SlR is energized via the contact d, and the direction of the combine is corrected to the right. In addition, when the switch 10l is turned on while the main switch 25 is turned on, the contact
_SR21 opens, but the timer _T1 keeps relay R3 energized for a predetermined time T, so the contacts close.
A timer _T2 with a short delay time _t is activated via SR22, and the left solenoid SlL is energized via contacts _ST2 and f, so that the combine 1 is corrected to the left with a slight delay. . In addition, switch 1 can also be set between grain culms 29 and 29, that is, between the rows.
0l is turned on, but the reaped grain culm 29' is not located in the grain culm detection sensor 12 part between the rows,
Therefore, since the main switch 25 is in the OFF state, the automatic control circuit is released and the combine harvester 1 moves straight.

On the other hand, when the combine harvester 1 is in the row mowing state in which it works along the rows, the horizontal mowing sensor 10 does not come into contact with the grain culm 29, and the left turning command switch 10l is always on, so the relay R3 is not energized, and the relay contact SR3 is maintained in the illustrated state, that is, the contacts a, c, and f are in the on state, and the direction is controlled by the row mowing sensor 9. That is, when the switch 9l is turned on, the left solenoid SlL is energized via the relay contact SR1 ₂ and the contact c, and the direction of the combine 1 is corrected to the left. Also, switch 9r
When turned on, the right solenoid SlR is energized via the timer T ₂ and contacts ST ₂ and e, and the combine 1
Correct the direction to the right.

Next, a partially modified embodiment will be described based on FIG. 8.

In the above-mentioned embodiment, the delay time t of the delay timer _T2 is set to a short time so as to cut short signals due to timing discrepancies, but during horizontal mowing work, the direction sensors 9 and 10 and the grain culm detection sensor 12 If the timings are set to always match, there is no need for the delay time t that constitutes a dead zone.

Therefore, in this embodiment, the horizontal cutting contact b of the relay contact SR3 is connected to the contact f via the relay contact _SR22 .
connected directly to. As a result, during horizontal mowing work, that is, when contacts b, d, and f of relay contact SR3 are closed, when main switch 25 is on and switch 10l is on, contact _SR22 is turned on via relay R2. , directly energizes the left solenoid SlL via the contact f, and the combine 1 is immediately corrected to the left without waiting for the delay time t. Further, the direction sensors 9 and 10 are located between the rows, and when the switch 10l is turned on, the reaped grain culm 29' is not located in the grain culm detection sensor 12 either, the main switch 25 is turned off, and the combine harvester 1 corrects the direction. It will not be done.

As explained above, according to the present invention, the grain culm detection sensor 12 installed slightly behind the cutting blade 12
Since the distance between the direction sensors 9 and 10 is set to approximately an integral multiple of the row distance L, during horizontal mowing work,
Only in the range where the direction sensor detects the grain culm or in its vicinity, the grain culm detection sensor 12 can detect the reaped grain culm 29' and turn on the main switch 25, thereby delaying the delay timer _T2. It is possible to significantly shorten the time t according to the row mowing operation, or to directly control the direction without using the delay time t caused by the delay timer _T2 during the horizontal mowing operation. Therefore, the direction control response becomes faster, and control performance can be significantly improved. Further, the grain culm detection sensor 12 has a sensor plate 13 having a length extending substantially over the entire width of at least one grain culm introduction path, and the sensor plate is connected to the cutting blade 1.
Since the main switch 25 is turned on when the machine comes into contact with the grain culm 29' that was harvested in step 1, the grain culm can always be reliably detected during the reaping operation, no matter what position the machine is in relation to the row of grain culms. In addition, the sensor plate 13 can be placed close to the cutting blade 11, eliminating the influence of the difference between the grain culm conveyance speed and the traveling speed, and the grain culm detection sensor 12 and direction sensors 9, 1
It is possible to accurately maintain the distance to zero in a predetermined relationship, and to perform the above-described quick response control accurately and reliably.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a combine harvester to which the present invention is applied, Fig. 2 is a plan view showing its grain culm detection sensor, Fig. 3 is its side view, and Fig. 4 is its grain culm detection sensor and direction sensor. A side view showing the relationship between
Figure 5 is a diagram showing the electric circuit of the automatic direction control device;
FIG. 6 is a diagram showing a time limit timer _T1 , FIG. 7 is a diagram showing a delay timer _T2 , and FIG. 8 is an electric circuit diagram according to another embodiment. 1... Combine harvester, 9, 10... Direction sensor, 9r, 9l, R1, a, c, e... Automatic direction control device for row mowing, 10r, 10l, R2, b,
d, f... Automatic direction control device for horizontal mowing, 11...
Cutting blade, 12... Grain culm detection sensor, 13... Sensor plate, 29'... Cutted grain culm, 25...
Main switch, T ₂ , ST ₂ ...delay timer.

Claims (1)

[Scope of Claims] 1. A combine harvester comprising a direction sensor consisting of a side sensor and a grain culm detection sensor for operating a main switch, and having an automatic direction control device that controls the direction of the machine body based on signals from these sensors, comprising: The detection sensor has a sensor plate located slightly behind the cutting blade and having a length spanning approximately the entire width of one grain culm introduction path divided by at least a divider, and the sensor plate is attached to the cutting blade. The automatic direction control device is configured such that the main switch is turned on when the main switch comes into contact with a grain culm that has been cut, and the direction sensor is installed in front of the grain culm detection sensor at a distance of approximately an integral multiple of the inter-row width. 2. The automatic directional control device is configured for row mowing and horizontal mowing, and the automatic directional control device for horizontal mowing is configured to directly control the direction without using a delay timer. direction automatic control device.