JPH0322Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a handling depth adjustment device for a harvester.

A harvesting machine such as a combine harvester is generally equipped with a running part such as a rubber crawler, and is designed to reap planted grain culms such as rice with a reaping part installed on the front of the harvester that can be raised and lowered while running on its own. . As shown in FIG. 1, the harvested grain stems are conveyed in the direction of arrow 2 by being sandwiched between a vertical conveying chain 3, which is a type of vertical conveying device, and a pair of clamping rods, and then transferred to a feed chain 6 and a pair of clamping rods. It is taken over by a transfer device 8 consisting of a rod 7 and passes into a threshing room 9. In the threshing chamber 9, a handling drum 11 having a large number of handling blades is rotating, and the tips of grain culms passing through are scraped off by the handling blades and threshed. Here, the length of insertion of the grain culm into the threshing chamber 9, that is, the handling depth, deeply affects the grain yield and threshing efficiency, and it is necessary to automatically adjust the handling depth according to the changing grain culm length. There is. Therefore, two culm length detection sensors 13 are installed at the threshing room entrance 12.
and 14 are provided, and the handling depth is detected by whether or not the grain culm passing through comes into contact with this detection sensor, and when the detection sensor 14 detects the deep handling state, the vertical By swinging the conveying chain 3 in the direction of the arrow 16 and changing the delivery position of the grain culm to the feed chain 6, the grain culm is moved in the shallow handling direction. When the culm length detection sensor 13 detects the shallow handling state, the vertical conveyance chain is moved in the opposite direction 16'.

By the way, as a conventional technique, as in Japanese Utility Model Application Publication No. 55-172044, a technique has been proposed that disables the automatic handling depth control mechanism when the traveling speed is operated below a certain speed. Since the automatic handling depth control mechanism is disabled even when traveling, the handling depth must be manually adjusted for the continuously supplied grain culms, which is complicated and
Since the operation of the automatic handling depth control mechanism is inadvertently disabled, there is a problem in that the vertical conveyance device cannot be moved manually even when the machine is traveling or when the machine is stopped.

In order to eliminate the above-mentioned drawbacks, this invention connects the automatic circuit and manual circuit to the vertical conveyance device, and also configures the automatic circuit to be disconnected only when the machine is stopped, allowing for automatic handling depth adjustment at low speeds. enable,
Furthermore, manual adjustments can be made reliably at low speeds and when stopped.

Next, embodiments embodying the present invention will be described with reference to the accompanying drawings from FIG. 2 onwards. Here, Fig. 2 is a control circuit diagram of an automatic handling depth adjustment device that is an embodiment of the present invention, Fig. 3 is a waveform diagram showing the operation of the same embodiment, and Fig. 4 is a control circuit diagram used in the same embodiment. FIG. 3 is a side sectional view showing the attached state of the interlocking switch.

In FIG. 2, the normally open contact M ₁ of the culm length detection sensor 13 and the normally open contact H of the culm length detection sensor 14 are connected in series, and the pulse generator 2
The culm length detection sensor 13 is connected to the input end 23 of 2.
The normally closed contact _M2 is connected to the input end 23 of the pulse generator 22 via a smoothing circuit 20b and a diode 21b. The input side of each of the above contacts is an off-delay circuit 24, and a normally open contact L of a grain culm supply sensor 25 that detects that the grain culm is being supplied to the threshing room.
and power battery 27 via automatic switch 26 etc.
It is connected to the. The pulse generator 22 consists of a comparator circuit, a delay circuit, etc., and is connected to a resistor _R1 or
The output power is fed back to the comparison voltage terminal 30 by a feedback circuit in which a diode 28 connected in series with R ₂ and a switch 27 and a diode 29 connected in series with a resistor R ₃ are connected in antiparallel to each other. . Therefore, while the input voltage is applied to the input terminal 23, the resistance R ₃
A pulse voltage Vp having a pulse width T ₁ due to the resistor R 1 or R ₂ and a pulse interval T ₂ due to the resistor R ₁ or R 2 is output to the output terminal 31.
can be obtained. Output terminal 3 of this pulse generator 22
1 is connected to each input terminal 33a, 33b of the two 2-input OR circuits 32a, 32b, and the output terminal 35 of the mono multivibrator 34 connected to the output terminal of the off-delay circuit 24 is connected to the OR circuit 1. Each remaining input terminal 36 of 32a, 32b
a, 36b. The mono-multivibrator 34 is designed to perform high-speed operation for a certain period of time after startup in anticipation that the condition of the grain culms to be transported will not be stable for a certain range after startup. The output end 37a of the OR circuit 32a is connected to the smoothing circuit 2.
It is input to the two-input AND circuit 38a together with the output terminal of 0a, and is input to the output terminal of the OR circuit 32b and the smoothing circuit 2.
0b is input to a two-input AND circuit 38b, and each AND circuit 38a and 38b
is connected to the actuator 15 via limit switches 39a and 39b switch circuits 40a and 40b.
(See FIG. 1) are connected to a shallow handling solenoid 41a and a deep handling solenoid 41b of electromagnetic valves that operate the solenoid valves.

Furthermore, an interlocking switch 42 with a normally open contact is inserted between the automatic switch 26 and the battery power source 27, and this interlocking switch 42 operates a transmission provided between the running wheels and the internal combustion engine. It comes into contact with a cam 44 fixed at the center of rotation of the gear shift lever 43 (shown in the fourth figure).
When 3 is in a position other than neutral, it is pushed by the cam 44 and turns on, and when it is in neutral, it comes off from the cam 44 and turns off.

Furthermore, the parallel manual switches 45a and 45b connected to the battery power supply 27 are normally open contacts, and are connected between the AND circuit 38a and the limit switch 39a and between the AND circuit 38b and the limit switch 39b via diodes 46a and 46b, respectively.
is connected between the switch circuit 4 and the switch circuit 4.
It is connected to transistors 47a and 47b forming transistors 0a and 40b. This transistor 4
7a and 47b are inserted between the AND circuit 38a and the ground, and between the AND circuit 38b and the ground, respectively. 48 is a pilot lamp indicating the automatic state.

The operation of the above embodiment will be explained with reference to the waveform diagram shown in FIG. 3. First, when the gear shift lever 43 is in a position other than neutral, that is, when the harvester is running, the interlocking switch 42 is pushed by the cam 44 and is in the on state, so when the automatic switch 26 is turned on and reaping starts, , the grain culm supply sensor 25 detects the supply of grain culms and turns on. Therefore, from this time point _t1 , the mono-multivibrator 34 is activated and sends continuous output for a certain period of time Tm to the OR circuits 32a and 32b. Considering the case where the length of the grain culm cut at this time is shorter than the standard, in this case, the culm length detection sensors 13 and 14 do not operate, so the contact M ₂ is on, the contacts M ₁ and H are off, and the smoothing circuit 24 Due to the function of , the input terminal 49b of the AND circuit 38b becomes H level at _t2 after a certain period _of time T0 from time _t1 . Therefore, the output signal from the AND circuit 38b together with the continuous signal sent from the mono multivibrator 34 via the OR circuit 32b is sent via the limit switch 39b to the switch circuit 40b.
The deep handling solenoid 41b is activated.
The vertical conveyance chain 3 is continuously sent to the deep handling side. Due to this movement, the tip of the grain culm that is being transferred eventually comes into contact with the culm length detection sensor 13 (time t ₃ ).
Contact _M1 is turned on, contact _M2 is turned off (contact H is turned off), and input ends 49a and 49b on one side of AND circuits 38a and 38b are set to L level, so both solenoids 41a and 41b are turned on. It becomes inactive and the swinging of the vertical conveyance chain 3 stops. Around this time, at time t ₄ , the mono multivibrator 34
After the set time Tm has ended, the pulse generator 2
2 to intermittent control (low speed control). As the reaping work continues, the culm length changes and the culm becomes either deep or shallow. For example, if the culm length is too long and the culm becomes too long, the culm length detection sensor 14 is activated.
Contact H turns on. Assuming that this time point is _t5 , the pulse generator 22 starts operating at _t6 after a certain time T0 _' has elapsed from this time by the smoothing circuit 20a, and intermittently sends pulse signals to the OR circuits 32a and 32b. The pulse signals output from the OR circuits 32a and 32b are sent to the AND circuits 38a and 38b, but since contact _M2 is open, the AND circuit 38 on the deep handling side
Since b does not satisfy the AND condition, it is not output, and only the AND circuit 38a on the shallow side satisfies the AND condition intermittently with the continuous signal input from the input terminal 49a and the intermittent signal input from the input terminal 37a. ,
The intermittent signal is output to the switch circuit 40a via the limit switch 39a. Therefore, the shallow handling solenoid 41a is activated to move the vertical conveyance chain 3 to the shallow handling side. The period of intermittent motion at _this time is determined by the on _time (H
level time) T ₁ and off time (L level time)
By switching the switch 27 and changing the resistor _{R1 to} another resistor _R2 , an arbitrary cycle can be obtained. Limit switch 39a,
39b is for stopping the movement of the vertical conveyance chain 3 at each limit position on the shallow handling side and the deep handling side.

Subsequently, if the harvesting machine is to be stopped for some reason, the speed change lever 43 is returned to the neutral position. Then, the cam 44 separates from the interlocking switch 42, the interlocking switch 42 turns off, the switch circuits 40a and 40b turn off, and both solenoids 4
Since both 1a and 41b become inoperative, the movement of the vertical conveyance chain 3 is stopped.

If you want to manually adjust the handling depth when the harvester is running or stopping, use the manual switch 45a or 45.
Perform step b. That is, when the shallow handling manual switch 45a or the deep handling manual switch 45b is turned on, the signal from the power supply 27 is applied to the diode 46a or 46b and the limit switch 39a or 39b.
The switch circuit 40a or 40b is actuated via the solenoid 41a or 41b for shallow handling. At the same time, the switch circuit 51a or 51a inserted between the AND circuit 38a or 38b and the installation is activated, and the automatic adjustment signal in the deep handling direction (or shallow handling direction) is cut off, and the vertical conveying chain is continuously operated in the shallow handling direction. move in the forward direction (or in the deep direction).

In the above embodiment, the interlocking switch 42 that interlocks the automatic handling depth adjustment device and the traveling device of the harvester is operated by the speed change lever 43.
The present invention is not limited to this, and the interlocking switch may be provided in the main clutch or in the transmission section. Also, the interlocking switch 42 is
In addition to the above-mentioned type that disconnects the circuit, a type that works on the switches 51a and 51b to ground the circuit before the manual circuit may also be used.

The present invention has the following effects.

Since the automatic handling depth adjustment is canceled only when the aircraft is stopped, the automatic handling depth adjustment device can be activated when the aircraft is traveling at low speed.

When the machine is stopped, automatic adjustment is canceled to prevent unnecessary operation, but manual adjustment is possible, so if necessary, adjust the handling depth of the harvested grain culm before stopping. be able to.

[Brief explanation of drawings]

Figure 1 is a front view of the handling barrel inlet of the handling depth adjustment device, Figure 2 is a control circuit diagram of the automatic handling depth adjustment device which is an embodiment of the present invention, and Figure 3 is the same embodiment. FIG. 4 is a waveform diagram of each element to explain the operation in the example, and is a side sectional view showing the attached state of the interlock switch used in the example. Explanation of symbols, 42... Interlocking switch, 13, 1
4... Culm length detection sensor, 34... Mono multivibrator, 20a, 20b... Smoothing circuit, 22...
...Pulse generator, 41a, 41b... Shallow handling, deep handling solenoid, 1... Grain culm, 3... Vertical conveyance device, 9... Threshing room, 11... Handling cylinder.

Claims (1)

[Scope of utility model registration request] A handling depth adjustment device for a harvester, which allows the insertion depth of grain culms into a threshing section to be adjusted by the amount of movement of a vertical conveyance device, and comprises an automatic circuit comprising a culm length detection sensor and a manual switch. A handling depth adjustment device for a harvester, characterized in that a manual circuit is connected in parallel to a vertical conveyance moving device, and the automatic circuit is only disconnected when the machine is stopped.