JPS5938103Y2 - Cutting height control device for reaper - Google Patents

Description

[Detailed Description of the Invention] The present invention is an artificial elevation control means that drives the reaping section, which is equipped on this machine so as to be able to ascend and descend, to a predetermined position indicated by a manual operation lever and maintains the position. and, ``When the lever is operated in a part of the instruction range where the reaping part is in the lowering position out of the entire position instruction range of the lever, based on the result of detecting changes in the unevenness of the ground by the ground detection sensor. The present invention relates to a cutting height control device for a reaper, which includes automatic intermittent control means that automatically and intermittently controls a reaping section to follow the ground.

The cutting height control device for this type of reaper not only frees the operator from the troublesome operation of adjusting the cutting height of the reaping unit due to changes in the unevenness of the ground, which is necessary during reaping work, but also Since the reaping section is intermittently controlled to raise and lower based on the results of detecting changes in the unevenness of the ground by the sensor, this may be caused by excessive lifting control as in the case where the reaping section is continuously controlled to raise and lower based on the detection results of the sensor. Although it has the advantage of being able to perform stable and good cutting height control at all times without the noching phenomenon, when turning the machine at the end of the field, it is difficult to move the lever from within the automatic intermittent drive lifting range of the reaping section. Raise the reaping section to a predetermined height by operating the reaping section outside, then operate the lever again from outside the automatic intermittent drive lifting range of the reaping section to within that range after turning to lower the reaping section to the predetermined reaping height. There was a problem when doing so.

In other words, it is difficult for an unskilled person to select the indicated position of the manual operation lever that corresponds to the minimum necessary raising range with the least time loss while making a safe aircraft turn. Since the lowering from the height to the cutting height position requires intermittent driving, it takes time to lower, which is disadvantageous in terms of efficiency.

In view of these points, the present invention not only simplifies the lifting and lowering operation of the reaping section when turning the machine, but also speeds up the raising of the reaping section to a set height and the subsequent lowering to a predetermined reaping height. and which is officially registered, wherein when the reaping section is under the automatic intermittent control, the automatic intermittent control is stopped by the first operation of the manual changeover switch. control state switching means that releases the stop with a subsequent second operation, and outputs a continuous raising command that drives and raises the reaping section continuously to a set height by the first operation of the manual changeover switch, and to hold the reaping part in position, and by the second operation of the manual changeover switch,
The present invention is characterized in that continuous elevation control means is provided for outputting a continuous lowering command for the reaping section until the sensor detects a predetermined height above the ground.

As a result, when the machine turns at the end of the field, by first operating the manual changeover switch, the automatically intermittently controlled reaping section can be continuously raised to the set height, and the turning is completed. By later operating the manual changeover switch for a second time, the reaping section located at the set height can be continuously lowered until the sensor detects the predetermined height above the ground. Not only can the reaping section be raised and lowered easily when the machine is turning, but the continuous drive lowering of the reaping section allows the predetermined reaping work posture to be quickly established, improving work efficiency. We have now been able to achieve this goal.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a combine harvester, in which the planted culm is raised to an almost vertical position in front of the machine 1, which has a threshing device 1C mounted on a machine frame 1B with a pair of left and right crawler-type traveling devices 1A. After reaping, the reaping section 2 that gradually changes the posture of the reaped husk to a sideways posture and transports and supplies it to the threshing device 1C is connected to the machine body via a hydraulic cylinder 3 interposed between the machine frame 1B and the machine frame 1B. It is equipped with a drive mechanism that can be moved up and down around the horizontal axis 11 in the direction of travel, and a bridge that can swing freely around the horizontal axis 12 at the back of the lower end of the pulling device 2A, which is one of the constituent members of the reaping section 2. A sensor 4 is provided which detects changes in the unevenness of the ground by detecting a rocking displacement of a ground contact 4A of a shape exceeding a certain level.

2 and 3 show the cutting height control relationship of the reaping section 2,
This includes an artificial elevation control means for driving the reaping section 2 up and down and maintaining the position at a designated predetermined position based on a position instruction from an artificially operated lever 6 provided on a control section 5 beside the reaping section 2; When the lever 6 is operated in a part of the instruction range a that lowers the reaping section l out of the entire position instruction range A of the lever 6, the reaping section 2 is moved based on the detection signal of the sensor 4. an automatic intermittent control means that automatically and intermittently controls the ground tracking; and when the reaping section 2 is under the automatic intermittent control, a manual changeover switch 2;
Control state switching means 1 for stopping the automatic intermittent control with the first operation of step 3 and canceling the stop with the subsequent second operation.
0, and the first operation of the manual changeover switch 23 outputs a continuous raising command to drive and raise the reaping section 2 continuously to the set height, and holds the reaping section 2 at the set height. The continuous lifting control means outputs a continuous lowering command for the reaping section 2 until the sensor 4 detects a predetermined height above the ground by the second operation of the manual changeover switch 23.

Incidentally, the sensor 4 is configured to be able to change its position in the vertical direction, and to be moved up and down by the swinging operation of the lever 6 within the automatic intermittent drive raising/lowering range a.

Further, the control state switching system for switching between the manual elevation control state and the automatic cutting height control state is configured as follows.

That is, it is determined whether the manual changeover switch I, which emits a signal of 0 or 1 in response to its on/off operation, and the lever 6 are located within the automatic intermittent drive lifting range a, and then A discriminator 8 that emits a signal 1 when the signal is within the range is provided, and the signal accompanying the on/off operation of the manual changeover switch 70 and the signal from the discriminator 8 are NANDed via an AND circuit 9. The O or 1 signal from the NAND circuit 10 as a control state switching means, which will be described later, is output to the circuit 10 and sent to the ascending circuit 12A and descending circuit 12 of the electromagnetic valve 11 that controls the expansion and contraction operation of the hydraulic cylinder 3.
A signal is output directly to AND circuits 14A and 14B of the manual control system connected to B via OR circuits 13A and 13B, respectively, and at the same time, a signal is inverted to AND circuits 15A and 15B of the automatic control system connected to the OR circuits 13B and 13A. The configuration is such that it is outputted via the knot circuit 16 of.

Note that one signal is normally input to the NAND circuit 10 from the continuous lift control system.

Therefore, when the manual changeover switch 7 is in the on state, even if the lever 6 is located within the automatic intermittent drive lifting/lowering range a, the output signal of the AND circuit 9 becomes O, and the AND circuit 10 A signal of 1 is output from.

As a result, the manual elevation control system becomes operable, but the signal output to the AND circuits 15A and 15B of the automatic control system becomes O by the knot circuit 16, so the automatic cutting height control system does not operate. Further, when the manual changeover switch I is in the off state and the lever 6 is located within the automatic intermittent drive lifting/lowering range a, the output signal of the AND circuit 9 becomes 1, and the output signal from the NAND circuit 10 becomes 1. A signal of 0 is output.

As a result, the AND circuit 15A of the automatic control system.

The signal output to 15B is set to 1 by the knot circuit 16, and the automatic cutting height control system becomes operable.
Manual control system AND circuit 14A.

Since the O signal is output to 14B, the manual elevation control system does not operate.

In short, by turning on and off the manual changeover switch 70, the state is switched between the manual elevation control state and the automatic cutting height control state.

The above-mentioned manual elevation control means is constructed as follows.

That is, the first detector 17 electrically detects the swinging displacement of the lever 6 as the set cutting height, and the first detector 17 electrically detects the vertical displacement of the reaping section 2 with respect to the main machine 1 as the actual cutting height of the reaping section 2. a second detector 18 for detecting rain, and a comparator 1 for subtracting detection signals from these rain detectors 17 and 18.
It is determined whether the difference signal from 9 is within the allowable range of the dead band setting value, and if it is within the allowable range, a signal of O is sent, and if it is above the allowable range, a signal of 1 is sent to the rising AND. circuit 1
4A and a descending AND circuit 14B are provided, so that when the manual changeover switch 7 is in the manual ascending/descending control state,
The reaping section 2 is controlled to move up and down until the difference signal from the comparator 19 falls within the allowable range of the dead zone setting value.

The automatic intermittent control means for the cutting height is constructed as follows.

That is, when the sensor box 4B of the sensor 4 comes into contact with the ground contact 4A, it emits a signal of 0,
Rising and descending contacts 4a and 4b are provided which emit a signal l when in a non-contact state, and both these contacts 4a and 4b
The signal is passed through knot circuits 21A and 21B for signal inversion to pulse oscillators 22A and 22A for rising and falling, respectively.
22B, and both these pulse oscillators 22
A.

The pulse signal from 22B is passed through the rising AND circuit 15.
A and the lowering AND circuit 15B, and therefore, when the manual changeover switch 7 is in the automatic cutting height control state, until the ground contact 4A is located between the two contacts 4a and 4b. , the reaping section 2 is maintained at a predetermined height by automatically and intermittently controlling the reaping section Z to ascend or descend based on the pulse signal from the ascending pulse oscillator 22A or the descending pulse oscillator 22B. It is structured as possible.

The continuous elevation control means is constructed as follows.

That is, based on the rise in voltage that occurs with the first operation of the switch 23, which is an automatic return type that can be manually operated, a 0 signal is generated and held until the next switch operation, and the second operation of the switch 23 is performed. A T flip-flop circuit 24 is provided which transmits and holds a 1 signal until the next switch operation based on the rise in voltage that occurs as a result of the switch operation.
An OR circuit 26 which outputs the signal from the T flip-flop circuit 24 and the signal from the AND circuit 9 of the control state switching system via a NOT circuit 25 for signal inversion;
Based on the rise of the signal from 0 to 1 in the 779717071 circuit 24, a pulse signal of a constant amplitude is output to the monomulti circuit 27, and a 0 signal is output from the OR circuit 26 to the OR circuit 26. A continuous rise holding circuit 28 that applies a predetermined voltage to the circuit on the first detector 17 side of the manual lift control system is connected only when the lift is carried out.

It also has a set terminal S connected to the mono multi circuit 27 and a reset terminal R connected to the lowering circuit side of the automatic cutting height control system, and a pulse signal is sent to the set terminal S from the mono multi circuit 27. is output, the lowering pulse oscillator 22B of the automatic cutting height control system and the lowering AND circuit 1
5B, and when a signal of 1 is output from the falling NOT circuit 21B to the reset terminal R, the continuous falling signal is released. RSS flip Flora circuit 3
0 is set.

Then, when the manual changeover switch 7 of the control state switching system is in the automatic cutting height control state and the lever 6 is located within the automatic opening drive lifting range a, when the switch 23 is first operated, the T flip-flop Since the output signal of the pull circuit 24 is switched from 1 to O, the output signal of the NAND circuit 10 serving as the control state switching means changes from O to 1, and the manual lift control system becomes operable. Become.

At this time, the signal output from the AND circuit 9 of the control state switching system to the OR circuit 26 via the NOT circuit 25 is O.
Therefore, from this OR circuit 26, the continuous rise holding circuit 2
8, an O signal is output.

Therefore, the voltage applied from the continuous rise holding circuit 28 causes the voltage balance of the rain detectors 17 and 18 to collapse, and the electromagnetic valve 11 is driven for rising from the rising discriminator 20A via the AND circuit 14A1 and the OR circuit 13A. A rising signal is output to the circuit 12A, and the rain detectors 17, 18
In other words, the reaping section 2 is continuously driven upward until the voltages are balanced, in other words, up to the set height.

Next, when the switch 23 is operated for a second time, the output signal of the T flip-flop circuit 24 is switched from 0 to 1, and the output signal of the NAND circuit 10 of the control state switching system is changed from 1 to O, so that the automatic mowing The high control system becomes operational, and a descending pulse signal is output from the descending pulse oscillator 22B to the descending drive circuit 12B of the electromagnetic valve 11. At this time, based on the pulse signal from the monomulti circuit 27, Since a continuous falling signal is output from the RSS flip Flora circuit 30 to the OR circuit 29, in other words, until the signal of the reset terminal RK1 of the RSS flip Flora circuit 30 is output from the falling NOT circuit 21B, The reaping section 2 is continuously driven and lowered until the sensor 40 and the ground contact 4A touch the ground.

In addition, numeral 31 in the figure is a variable resistor that can set and change the raising limit of the reaping section 2.

[Brief explanation of drawings]

The drawings show an embodiment of the cutting height control device for a reaper according to the present invention, in which Fig. 1 is an overall side view of the combine, Fig. 2 is a cutting height control circuit diagram, and Fig. 3 is a part of the main parts. FIG. 1... Main machine, 2... Reaping section, 4...
...Ground detection sensor, 6...Manual operation lever, 10...Control state switching means, 23...
...Separate switch, A...Full position indication range, a
・・・・・・Automatic intermittent drive lifting range.

Claims (1)

[Scope of utility model registration request] Artificial elevation control means for driving the reaping section 2, which is equipped on the machine 1 so as to be able to ascend and descend, at a designated predetermined position based on a position instruction from a manual operation lever 6 and maintaining the position;
When the lever 6 in a part of the instruction range A that puts the reaping part 2 in the lowering position out of the entire position instruction range A of the lever 6 is in the operating position, the result of detecting a change in the unevenness of the ground by the ground detection sensor 4. In the reaping machine equipped with an automatic intermittent control means that automatically and intermittently controls the reaping section 1 based on the ground tracking control means, when the reaping section 2 is under the automatic intermittent control, the manual changeover switch 23 is A control state switching means 10 that stops the automatic intermittent control with one operation and cancels the stop with a subsequent second operation, and a control state switching means 10 that causes the automatic intermittent control to be stopped with a subsequent second operation, and with the first operation of the manual changeover switch 23, the reaping section 2 is continuously moved to a set height. Outputs a continuous rise command to raise the drive,
While holding the reaping section 2 in position at the set height, a continuous lowering command for the reaping section 2 is output until the sensor 4 detects a predetermined height above the ground by the second operation of the manual changeover switch 23. A cutting height control device for a reaper, which is provided with continuous lifting control means.