JPH0142969Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applicable to mobile agricultural machines such as combines.
The present invention relates to an automatic lifting control device for a working machine that can lower the working machine further than a lowering restriction position by automatic control only by re-lowering the lifting operation mechanism.

Generally, for mobile agricultural machinery such as combines,
Work machines such as the pre-processing section are automatically controlled so that the lowering position is always at a constant lowering regulation position by a lifting operation mechanism equipped with an automatic control circuit mechanism that automatically regulates the lowering position. It is known that By the way, during work, for example, when there is a lodging grain culm, it is necessary to lower the working machine further than the lowering restriction position by automatic control. Therefore, conventionally, in order to lower the work equipment further than the above-mentioned lowering restriction position, it is necessary to raise the work equipment and then adjust the preset lowering restriction position until it reaches the newly set lowering restriction position. It was necessary to either lower the machine, or switch the work machine from automatic control to manual control and then lower it to the desired lowering position using a control lever. However, these operations cannot be performed simply by operating the operating lever, and are therefore complicated and lack quick response.Especially in the former case, the work equipment must be raised and then moved to the lowering restriction position. Since the adjustment range for the ground height of the work equipment that has been used until now is unclear, it is difficult to adjust to the appropriate position.On the other hand, in the latter case, manual control In any case, this was not a preferable method, as the operator often forgot to return to automatic control, causing the work equipment to collide with the ground in the next step.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and when the detector detects continuous operation of the operating lever in the downward direction,
The control lever is connected to an automatic control circuit that operates the lower drive mechanism via a comparison circuit consisting of a work equipment lift position detector and a setting device, and controls the work equipment to descend to a preset lowering regulation position. By providing an auxiliary circuit that operates the descending side drive mechanism regardless of the output of the comparison circuit for a predetermined period of time after the start of operation to the descending side, the work equipment can be lowered further than the descending restriction position. If you want to lower the work equipment further than the preset lowering restriction position, you can easily lower it by simply operating the operating lever to the lowering side again. It is an object of the present invention to provide an automatic lowering control device for a working machine in a mobile agricultural machine that can be kept in an automatic control state without causing the working machine to collide with the ground.

The configuration of the present invention will be explained based on an embodiment shown in the drawings. Reference numeral 1 indicates a preprocessing section installed at the front of the combine harvester.
A hydraulic cylinder 3 whose upper and lower sides are pivotally supported on the fuselage 2 side, and which is disposed on the lower pivot 1a side.
It is designed to move up and down by the telescopic operation of the. The hydraulic path of the hydraulic cylinder 3 is constructed as shown in FIG. That is, the switching valve 4 is a solenoid operated by a command from an automatic control circuit, which will be described later.
Switched by SD and SU. Of the above-mentioned solenoids, when the solenoid SU side is activated, the oil in the oil tank 4a is sent to the hydraulic cylinder 3 side, the hydraulic cylinder 3 is extended, and the pretreatment section 1 is raised, but when the solenoid SD side is activated, the oil in the oil tank 4a is sent to the hydraulic cylinder 3 side, and the pretreatment section 1 is raised. The oil in the hydraulic cylinder 3 flows back into the oil tank 4, the hydraulic cylinder 3 is contracted, and the pre-processing section 1 is lowered.

Reference numeral 5 denotes an operating lever disposed near the driver's seat (not shown). Switches Sd and Su are disposed near the pivot portion of the operating lever 5, and the operating lever 5 is moved downward (in the direction of arrow D). If you operate the
Sd is closed, and when operated in the upward direction (direction of arrow U), switch Su is closed.

On the other hand, in the automatic control circuit, as shown in Fig. 5, the positive (+) side line is branched into lines connected to switches Sd and Su, respectively, and when switch Su is closed, solenoid SU is activated. .
Further, the solenoid SD is connected to the AND element 6. And this AND element 6 is the switch Sd
Input from inverter 7 and comparator 8 upon closing of
When the inputs from both become 1, the output becomes 1
This causes the solenoid SD to operate. The comparator 8 compares the inputs from the potentiometer 9 and the variable setting device 10, and is set so that when the two are not equal, the output is 1, and when the two are equal, the output is 0. The potentiometer 9 outputs an output voltage in response to changes in the vertical and vertical positions of the preprocessing section 1. It is provided. That is, although the potentiometer 9 is fixed to the body 2 side by a mounting plate 9a, an actuating plate 11 is integrally fixed to a rotating shaft 9b of the potentiometer 9. An actuating rod 12 protruding from the upper frame 1c of the pre-processing section 1 is provided in a notch groove 11a formed in the actuating plate 11.
are fitted, and the actuating plate 11 is rotated by the rotation of the upper frame 1c about the upper pivot 1b as a fulcrum as the pretreatment section 1 moves up and down. It is designed to output an output corresponding to the vertical and vertical positions of 1.

Further, an on-delay timer 13 and an inverter 14 are connected between the input line 6a from the comparator 8 to the AND element 6 and the input line 6b from the inverter 7.
An auxiliary circuit A is provided. That is, the auxiliary circuit A outputs 1 when the input is 0,
The basic logic circuit is a so-called NOT circuit in which the output is 0 when the input is 1, but furthermore, when the input changes from 0 to 1, the output does not immediately become 0 but remains for a predetermined period of time t. It is set so that it becomes 0 with a delay of . Therefore, in the auxiliary circuit A, when the switch Sd is closed and the input from the inverter 7 is received, the output to the line 6a side is delayed by a predetermined time t and becomes 0.

In addition, in the figure, 15 is the inverter on the switch Su side,
16 is a check valve, 17 is a hydraulic pump, 18 is a cutting blade,
19 is a return bullet for the operating lever 5.

Next, the operation of the present invention constructed as described above will be explained. While working in the field, in order to raise the pretreatment section 1 for turning the machine, etc., operate the operating lever 5 in the direction of the arrow U, and the switch Su will close and the solenoid SU will operate. The accompanying switching of the switching valve 4 causes the hydraulic cylinder 3 to extend and the pre-processing section 1 to open.
will rise. On the other hand, in order to lower the pre-processing section 1, the operating lever 5 may be operated in the opposite direction of the arrow D. That is, the preprocessing section 1 is the variable setting device 1.
When the position is above the lowered position set by 0, the outputs of the potentiometer 9 and the variable setting device 10 are different, and therefore the output of 1 is output from the comparator 8 to the line 6a side of the AND element. It will be done. However, when the switch Sd is closed (Fig. 6 t ₀
~t ₁ ), the output from the inverter 7 is 0, so the solenoid SD is not activated and the pretreatment section 1 remains raised, but the switch SD is closed by the operating lever 5 (see Fig. 6). t ₁ ), the input from the inverter 7 becomes 1, the AND element 6 becomes the output 1, and the solenoid SD operates, and accordingly the switching valve 4
The preprocessing section 1 is lowered by the switching ( _t1 to _t2 in FIG. 6).
Then, the pre-processing section 1 descends, and the potentiometer 9
Variable setting device 1 with preset output from
When the output becomes equal to 0, the output from the comparator 8 becomes 0 (t ₂ in Fig. 6), and therefore the operating lever 5
Even if you continue to operate it in the direction of arrow D (Fig. 6 t ₂ - _{t 3} ),
The output of the AND element 6 becomes 0, the solenoid SD becomes inactive, the switching valve 4 returns to the neutral position, and the preprocessing section 1 is automatically regulated to the set lowered position. Therefore, the operator performs the reaping work at this lowering restriction position ( _t3 to _t4 in Fig. 6).

By the way, during the reaping operation, the pre-processing section 1 is not lowered sufficiently at the lowering restriction position by the automatic control.
If you want to go further down, for example, if there is a lodging grain culm in the field and you want to harvest it, in the present invention, if you operate the operating lever 5 again in the direction of arrow D,
The pre-processing section 1 will be lowered further than the lowering restriction position where it has been performing the reaping operation up to now. That is, in the descending state due to the automatic control in which the operating lever 5 is returned to the neutral position, the output from the inverter 7 becomes 0, and the inverter 7 on the auxiliary circuit A side outputs an output of 1 to the line 6a. There is.
Then, when the operating lever 5 is operated again in the direction of the arrow D, the switch Sd is closed and the output of the inverter 7 becomes 1 (FIG. 6, t ₄ ). In the auxiliary circuit A, since the on-delay timer 13 uses the NOT circuit as a basic logic circuit, when the output from the inverter 7 becomes 1, the output becomes 0 with a delay of time t. Only during the period shown from ₄ to _t5 , the AND element receives an equal input of 1 from both input lines 6a and 6b, so that the solenoid SD is activated and the preprocessing section 1 is lowered.

In this way, in the present invention, the preprocessing section 1 is
If you wish to perform work at a lower position than the preset automatic control lowering restriction position, you can simply press the operating lever without switching to manual control or readjusting the variable setting device 10 as in the past. This can be done reliably by simply operating 5 again to the arrow D side, that is, to the downward direction. Therefore, the above-mentioned lowering operation of the pre-processing section 1 becomes easy, and furthermore, when the above-mentioned lowering operation is performed again, the variable setting device 10 side is not adjusted at all, and is carried out only by operating the operating lever 5 while the automatic control state is maintained. The descending regulation state by automatic control will be maintained. For this reason,
When the lodging grain culm is finished or when the machine is rotating, if the pre-processing section 1 is raised, the pre-processing section 1
is automatically controlled again, thereby preventing the pre-processing section 1 from colliding with the ground due to forgetting to return the pre-processing section 1, and allows work to be performed with high responsiveness.

In summary, in the present invention, when the detector Sd detects continuous operation of the operating lever 5 to the lowering side, the lowering side is driven via the comparison circuit 8 composed of the work equipment elevation position detector 9 and the setting device 10. The automatic control circuit that activates the mechanism SD and controls the work equipment to descend to a preset descending restriction position is configured to control the automatic control circuit for descending the work equipment to a preset descending restriction position for a predetermined period of time from the start of operation of the operating lever 5 to the descending side, regardless of the output of the comparator circuit 8. Since an auxiliary circuit A is provided to operate the lowering side drive mechanism SD, and the work equipment can be lowered further than the lowering restriction position, when it is desired to lower the working equipment further than the automatically controlled lowering restriction position. , simply operating the operating lever 5 to the lowering side again will cause the work machine to descend further, and therefore, switching from automatic to manual control,
The complicated operation of adjusting and resetting the lowering restriction position is completely unnecessary, making the operation easier and eliminating the need to forget to return to the next stroke after lifting the work equipment, resulting in faster response. This makes it possible to perform ideal lowering control of the working machine with a wide range of functions.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic lifting control device for a working machine in a mobile agricultural machine according to the present invention, in which FIG. 1 is a schematic side view of the main parts of a combine harvester, and FIGS. A side view and a plan view of the main parts showing the installation state of the meter, Fig. 3 is an explanatory diagram of the operation lever, Fig. 4 is a hydraulic circuit diagram of the elevation control mechanism,
FIG. 5 is a circuit diagram of the automatic control circuit mechanism, and FIG. 6 is a chart diagram showing the operating state. In the figure, 1 is a pre-processing section, 3 is a hydraulic cylinder, 5 is an operating lever, 6 is an AND element, 8 is a comparator, 13
is an on-delay timer, and A is an auxiliary circuit.

Claims (1)

[Scope of utility model registration request] Detects continuous operation of the operating lever 5 to the lowering side.
When SD is detected, the lowering side drive mechanism SD is operated via the comparison circuit 8 consisting of the work equipment elevation position detector 9 and the setting device 10, and the work equipment is lowered to a preset lowering regulation position. An auxiliary circuit A is provided in the automatic control circuit to operate the descending drive mechanism SD for a predetermined period of time from the start of the operation of the operating lever 5 to the descending side, regardless of the output of the comparator circuit 8,
An automatic lifting/lowering control device for a working machine in a mobile agricultural machine, characterized in that the working machine can be lowered further than a lowering restriction position.