JPS5823718A - Apparatus for automatically adjusting operation depth of combine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic handling depth adjustment device in a harvesting machine such as a combine harvester, and in particular, a culm length detection sensor that detects the insertion depth of a culm into a threshing section. It relates to a device that is movable in the direction away from the culm and that enables stable harvesting work that suits the crop conditions.

A harvesting machine such as a combine harvester is generally equipped with a running part such as a rubber crawler, and is configured to reap the planted culms of rice or the like using a reaping part provided on the front of the harvester that can be raised and lowered while running on its own. As shown in Fig. 1, the cut culm is conveyed in the direction of arrow (2) by being held between a vertical conveyor cheno (11) and a lever, which is a type of rotating vertical conveyor. , is taken over by a transfer device (5) consisting of a foot chain (3) and a clamp rod (4), and passes through the threshing room (6).In the threshing room +61, there is a handling barrel with many plate blades installed. (7) is rotating,
The tips of the passing culms are scraped off by a blade and threshed.

Here, the insertion length of the culm into the threshing chamber (6), that is, the handling depth is
This has a profound effect on grain yield and threshing efficiency, and the handling depth needs to be automatically adjusted according to the changing grain culm length. Therefore, two culm length detection sensors α and 0 are installed in the threshing room population @.
The handling depth is detected by whether or not the culm passing through comes into contact with this detection sensor. When the detection sensor α fathom detects a deep handling state, the actuator (2) The transport chain (1) is swung in the direction of the arrow am, and the transfer position of the shell culm to the foot chain (3) is changed, thereby moving the shell culm in the direction of the planking. When the culm length detection sensor (2) detects the cross-boarding state, the vertical conveyance chain is moved in the opposite direction -.

Such harvesters are used not only to harvest rice but also to harvest wheat, but wheat has more weeds than rice, and the weeds tend to get entangled with the culm length detection sensor. If the gap between the wheat and the iron plate at the entrance of the threshing room that guides it toward the sensor is the same as the rice, the sensor function will be lost due to entanglement with weeds, and automatic operation will not be possible.

In addition, in the case of wheat, the variation in the tips of the ears is greater than that of rice, so if the handling depth conditions are the same as for rice, there will be some unhandled grain.

Therefore, the first object of the present invention is to change the handling depth conditions according to the crop conditions of rice, wheat, etc., and to create an automatic handling depth that can prevent weeds from getting entangled with the culm length detection sensor and leaving unhandled crops. The purpose of the present invention is to provide a regulating device.

Furthermore, conventionally, the handling depth has been controlled intermittently to prevent hunting caused by sudden changes in culm length, but in the case of wheat, the culm is harder than that of rice, so it is difficult to control the culm length. There is a problem that detection tends to be uncertain. Therefore, the second purpose of the present invention is to stabilize the control by changing the control system drive conditions at the same time when changing the handling depth condition according to the crop conditions, thereby solving the problem of untreated crops. The point is that we are trying to achieve this.

Next, embodiments embodying the present invention will be described with reference to the accompanying drawings starting from FIG. Here, FIG. 2 is a control circuit diagram of an automatic handling depth adjustment device that is an embodiment of the present invention, and FIG. 3 is a front view of the culm length detection sensor used in the embodiment, showing the installed state of the sensor. FIG. 4 is a waveform diagram showing the operation of the same embodiment.

In Fig. 2, the normally open contact (Ml) of the culm length detection sensor αl
) and the normally open contact (H) of culm length detection sensor No. 0 are connected in series, and a smoothing circuit (20 m) consisting of an on-delay circuit, etc.
, is connected to the input terminal (to) of the pulse generator ■ via a diode (21 m), and is connected to the normally closed contact (M
is connected to the input end of the pulse generator @ via a smoothing circuit (20b) and a diode (21b).

The input side of each of the above contacts is connected to the off-delay circuit (■), the normally open contact (L) of the grain culm supply sensor (c) that detects that the husk is being supplied to the threshing room, and the automatic switch (to). Power is connected to battery.

The pulse generator (■) consists of a comparator circuit, a delay circuit, etc., and includes a diode (to) connected in series with a resistor (R1) or a switch (2), and a diode (support) connected in series with a resistor (R$). ) are connected in antiparallel to each other so that the output voltage is fed back to the comparison voltage terminal (to) by a feedback circuit. A solenoid (41j) for adjusting the handling depth, which will be described later.

(41b) is intermittently driven by a pulse signal sent from this pulse generator@, and hunting etc. are prevented, but the pulse interval (T
The length of 2) is determined by the resistance (R1) or (R1). The switch for switching between the resistors (R1) and (R1) is switched in conjunction with changes in the detection positions of the culm length detection sensors α and αΦ. That is, as shown in the third section, the sensor case (2) containing the culm length detection sensors α1 and QΦ is attached to the tip of the sensor bracket which is swingable about the support shaft. This sensor bracket has a pin installed on the sensor bracket on the left side of the above-mentioned support shaft, and a pin installed on the left side of the support shaft.
The tension spring installed between the bottle and the bottle installed on the machine base on the right side of 62b
). Planted on the machine side,
Sensor bracket long hole ■6 (the loosely fitted bottle is
These are stoppers in the lower and upper positions of the sensor bracket. A pulse changeover switch incorporating the changeover switch Cη is attached to the side of the sensor bracket, and when the bracket is in the upper position (62b), the side wall of the bracket Therefore, when the normally closed contact on the resistor (R1) side is closed and in the lower position (621), the side wall contacts the switch INK and the normally closed contact on the resistor (IL) i (connected Close the contact point (2).The sensor bracket is tilted to the upper position (62b)k when reaping wheat, and the lower position (62b) set when reaping rice, the position of the sensor case is inserted. Move away from the culm (1') and touch the entrance iron plate.
The gap between the culm length detection sensor 0# and the culm length detection sensor is from <1m> (11)
spread to Since the resistance (ILt) is set larger than the resistance (R), the pulse interval of the pulse signal for intermittent driving is set longer for wheat reaping than for rice reaping. Ru. Therefore, while the input voltage is applied to the input terminal (to), the pulse voltage (Vp ) is obtained at the output terminal ■.The output terminal (2) of this pulse generator (2) is
Two two-person OR circuits (32λ).

Each input electron (33) of (32b) is connected to the output terminal (to) of the mono multivibrator (to) connected to (33b) and to the output terminal of the off-delay circuit (to).
are connected to the remaining input terminals (36m) and (36b) of the OR circuits (32m) and (32b), respectively. The mono-multivibrator (to) is designed to perform high-speed operation for a certain period of time after startup, anticipating that the condition of the culm being fed will not be stable within a certain range after startup. The output (37m) of the OR circuit (32m) is combined with the output of the smoothing circuit (20&) and the two-man AND circuit (38m).
), the output of the OR circuit (32b) and the smoothing circuit (
20b) is input to a two-man powered AND circuit (38b), and each AND circuit (38 and (38b)
is the solenoid for the solenoid valve plate (41 Otori) and the deep handling solenoid that operate the actuator ■ (see Figure 1) via the limit switches (39m) and (39b), the switch circuit (40m) and (40b) (41b).

Furthermore, the parallel manual switches (45 and (45b)) connected to the parts power supply ml are normally open contacts, and the AND circuit (38m) and the limit switch (39m) are connected via diodes (46 and (46b), respectively). and,
Connected between the AND circuit (38b) and the limit switch (39b), and the switch circuit (40m)
Transistors (47 and (40b) constituting and (40b)
47b) K-connected. This transistor (47
and (47b) are inserted between the AND circuit (38) and the ground, and between the AND circuit (38b) and the ground, respectively. - 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. Turn on the automatic switch (to),
When the reaping device and vertical conveyance device (1) (not shown) are driven, the culm is harvested and the culm is supplied to the threshing section, and in the process, the contact (L) of the culm supply sensor (to) is turned on. Become.

Therefore, from this point in time (tt), the mono-multivibrator (to) operates and sends continuous output for a certain period of time (Tm) to the OR circuits (32@) and (32b). Considering the case where the length of the cut culm at this time is shorter than the standard, in this case, the culm length detection sensor 01, (1m does not operate, so the contact (Ms) is on, (Ml), (H
) is off, and the AND circuit (b) is turned on after a certain period of time (To) from time (tl) due to the function of the smoothing circuit b).
The input terminal (49b) of 38b) becomes H level.

Therefore, from the mono multivibrator (to) to the OR circuit (3
The output signal from the AND circuit (38b) together with the continuous signal sent through 2b) is sent to the limit switch (39b).
It is sent to the switch circuit (40b) through the , and the deep handling solenoid (41b) is activated to continuously send the vertical conveyance ceno (1) to the deep handling side. Due to this movement, when the tip of the culm being transferred comes into contact with the culm length detection sensor 03 (time (tl)), the contact (Ml) is turned on and the contact (M2) is turned off ( contact (H) is off), and the input terminals (49m) and (49b) on one side of each AND circuit (381k) and (38b) are at the L level, so both solenoids (41m) and (41b) are inactive. Then, the swinging of the vertically conveyed ceno fi+ stops. Around this time, the set time (Tm) of the mono-multivibrator (to) ends at time (t4), and thereafter, intermittent control (low-speed control) by the pulse generator @ is started. As the reaping work continues, changes in culm length will result in a state of deep handling or cross cutting. For example, if the culm length is too long and a state of deep handling occurs, the culm length detection sensor αΦ is activated and the contact point ° (c) turns on. If this point is (b), from this point on, the smoothing circuit (2
After a predetermined time (T·) has elapsed (tl) with 0m), the pulse generator port starts operating and sends intermittent pulse signals to the OR circuits (32m) and (32b). OR circuit (3
The pulse signal output from 2@) and (32b) is sent to the AND circuit (38 and (38b), but since the contact (M) is open, the AND circuit (38b) on the deep handling side does not meet the AND condition. Since there is no dripping, there is no output, and only the AND circuit (38) on the shallow handling side generates intermittent signals due to the continuous signal input from the input terminal (4911) and the intermittent signal input from the input terminal (371). The AND condition is set, and an intermittent signal is output to the switch circuit (40m) via the limit switch (39). Therefore, the cross plate solenoid (41) is intermittently driven, and the vertical conveyance cheno (1) is handled shallowly. As mentioned above, the period of intermittent movement at this time is determined by the resistance (Rs) and (iLt)l (thus, the on time (H level time) (TI) and the off time (L level time) (T By changing the inclination of the sensor bracket @, switching the switch @, and changing the resistor (Rs) to the resistor (R1), the pulse cycle will automatically change from a pulse cycle suitable for rice harvesting to a pulse cycle suitable for rice harvesting. It is possible to switch to
It is possible to obtain a gap between the culm length detection sensor and the entrance iron plate that is suitable for each.

As described above, the present invention allows the culm length detection sensor to be moved freely in the direction perpendicular to the detected culm, so it can be easily used as the culm length detection sensor even when harvesting wheat with many weeds. By adjusting the gap between the entrance iron plates, it is possible to prevent weeds from getting entangled, and if this gap is widened at different frequencies, the sensitivity of the culm length detection sensor is reduced and a state of deep handling can be obtained, which reduces the large variation in the tips of the ears. It has the advantage of preventing wheat from being left unhandled. In addition, since the intermittent driving cycle of the automatic handling depth adjustment device is changed in conjunction with the above-mentioned gap switching, it is also useful in the case of wheat where the culm length is likely to be uncertain due to hard culms. A stable control state can be obtained, and confusion in handling depth control due to hunting etc. can be prevented.

[Brief explanation of the drawing]

Figure 1 is a view of the handling depth adjustment device seen from the front of the handling barrel entrance;
Fig. 2 is a control circuit diagram of an automatic handling depth adjustment device which is an embodiment of the present invention, Fig. 3 is a front view of the culm length detection sensor used in the embodiment showing the installed state of the sensor, and Fig. 4 The figure is a waveform diagram showing the operation of the same embodiment. (Explanation of symbols) 13.14-・Culm length detection sensor, 6...Threshing section (threshing room), 1...Vertical conveyance device (Che 7), 1, 1'-・
・Culm, 60...Sensor case, 62-...Sensor bracket, 68...Pulse changeover switch, 65...
Tension spring, R+, 'kHz-...resistance, 22
...Pulse generator. Patent Applicant Yanmar #IIIA Co., Ltd. Agent Patent Attorney Takeshi Honjo Rikitsutsu 1 Diagram [-

Claims (1)

[Claims] 1. It has a culm length detection sensor that detects the insertion depth of the grain culm inserted into the threshing section, and changes the position of the vertical conveyance device that supplies the husk to the threshing section based on the signal from this culm length detection sensor. The culm length detection sensor ← is made movable in the direction away from the detected culm by using the automatic handling depth adjustment device that automatically adjusts the insertion depth to a constant value, and the culm length detection sensor An automatic depth adjustment device for a harvester, in which the intermittent drive cycle of the automatic depth adjustment device is changed in conjunction with the movement of the automatic depth adjustment device.