JPS5928365B2 - Combine harvester cutting height control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reaping section height control device for a combine harvester, and particularly to lowering control when lowering the reaping section from an elevated state to a fixed height position close to the ground.

Normally, the reaping section of a combine harvester is lowered to bring it close to the ground during reaping work, and raised for smooth operation when traveling or driving on the road.

By the way, conventionally, when lowering the reaping section from a raised state to a certain height position close to the ground for reaping work, the sensing lever of the height sensor attached to the reaping frame of the reaping section hits the ground. Since the height sensor's sensing lever goes into a soft part of the ground or a depression, the mowing section will go down too far and the force on the weeding rod etc. will be lowered. Accidents such as running into shelves have sometimes occurred.

In view of these circumstances, the present invention prevents the reaping part from lowering too much due to continuous lowering of the reaping part at once, and keeps the reaping part at a constant height above the ground even if there are soft parts or depressions in the field. An object of the present invention is to provide a reaping section height control device for a combine harvester which is improved so that the reaping section height can be accurately lowered to a lower position and maintained at that position.

To this end, the present invention has been developed to set the cutting height by automatically lowering the cutting part gradually in a pulsed manner after the cutting part continuously descends from the raised state and approaches the ground. The present invention is characterized in that the ground sensor accurately detects the ground, and the cutting section is held at a constant height above the ground.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

To explain the combine harvester to which the present invention is applied in FIG. 1, a reaping section 3 is provided at the tip of a machine body 2 mounted on a traveling device 1, and the culm harvested by this reaping section 3 is sequentially The grain is transported to the rear and threshed by the threshing section 4,
Furthermore, the paddy is stored in a paddy bag or the like, and the waste straw is cut into pieces by a cutter device 5 and then discharged.

In addition, the reaping section 3 includes a reaping frame 6 and a weeding rod 7,
The lifting device 8 and the like are designed to swing vertically and move up and down, and a normally closed height sensor 10 having a sensing lever 9 is installed at the bottom of the reaping frame 6 as shown in FIG.
A microswitch 12 as a detection mechanism is provided at a portion where the rear end of the reaping frame 6 is rotatably supported by the chassis frame 11 of the machine body 2.

As shown in FIG. 3, this microswitch 12 has a movable contact 13 in contact with the rear end 6' of the reaping frame 6, and the reaping frame 6 rotates downward to a certain height close to the ground. When this happens, the movable contact 13 is pushed by the protrusion 14 on the end 6' and turned on.

Next, the lowering control system of the reaping section will be explained with reference to FIG.

One side of the normally open lower operation switch 15 is grounded, and the other side is connected to a capacitor 16, etc., and is also connected to the set input side of a flip-flop 18 using a NOR gate via a negative logic inverter 17. .

Further, a capacitor 19 that generates a reset pulse when the power is turned on is connected to the reset input side of the flip-flop 18 via a negative logic inverter 20 and an OR gate 21, and one output side of this flip-flop 18 is connected to a diode 22 and a switch. It is connected to a lowering solenoid valve 24 via a lowering transistor 23.

The output side of the inverter 20 is further connected to the set input side of another flip-flop 25 formed by a NOR gate, and one output side thereof is connected to the set input side of another flip-flop 25 formed by a NOR gate.
It is connected to the.

The above-mentioned normally closed height sensor 10 has one end connected to the ground, the other end connected to the capacitor 26, etc., and the NOR gate 2
It is connected to the input side of 7.

The above-mentioned normally open microswitch 12 has one end connected to the ground and the other end connected to a capacitor 28 etc., and is also connected to the input side of a NOR gate 27 via a negative logic inverter 29, and the output of this NOR gate 27 is negative logic on the side
It is connected to the R gate 30.

The other output side of the flip-flop 18 is further connected to the input side of the NOR gate 30, and the output side thereof is connected to the reset input terminal of the flip-flop 25.

The other output side of the flip-flop 25 and the NOR gate 2
The input side of the height sensor 10 of 7 is connected to an automatic pulse circuit 32 via a negative logic NOR gate 31, and this automatic pulse circuit 32 is connected to the gate side of a transistor 23 via a diode 33. There is.

In the reaping section height control device according to the present invention, in particular, the lowering control system is configured as described above, so that when the power is turned on, the input side of the inverter 17 is 1, and the output side of the inverter 17 and the set input side of the flip-flop 18 are 0. has become,
At this time, the capacitor 19 is not charged and the input side of the inverter 20 is 0, so the output side of the inverter 20 is inverted and becomes 1, and the OR gate 2
With the output of 1, the reset input of flip-flop 18 becomes 1, and the output of flip-flop 18 becomes 1,
It becomes a reset state of 0.

Further, the set input side of the flip-flop 25 is set to 1 together with the output side of the inverter 20, and furthermore, the set input side of the flip-flop 25 and the output side of the flip-flop 18 are set to 1, and together with one output side of the flip-flop 18, the NOR cable '-1-3
One input side of 0 becomes 1, and the reset input side of the flip-flop 25 becomes 0 together with its output side, so that the output side of the flip-flop 25 becomes set to 0 and 1, but the output of 1 from this The signal is NOR gate 31
is inverted, and no signal is input to the automatic pulse circuit 32.

Therefore, the flip-flop 18 and the automatic pulse circuit 32
Since no signal is output from any of the solenoid valves 24, the transistor 23 is in a non-conducting state and no electricity is supplied to the lowering solenoid valve 24, so that the reaping section is not lowered.

Then, when the capacitor 19 is charged to some extent and the input side of the inverter 20 becomes 1, the reset input side of the flip-flop 18 becomes 0 and its output side is held in the above-mentioned state, and at the same time the set input side of the flip-flop 25 becomes 0. and its output side is also held in the above state.

When the descending operation switch 15 is turned on after preparing for the descending operation in this way, the input side of the inverter 17 becomes 0 due to discharge of the capacitor 16, and the set input side of the flip-flop 18 as well as its output side become 0. 1, and the flip-flop 18 is set.

Then, an output signal is generated from the flip-flop 18, the transistor 23 becomes conductive, and the lowering solenoid valve 24 is turned on.
energized, the reaping section will be lowered continuously.

At this time, one input side of the NOR gate 30 becomes 0, but the height sensor 10 is turned on and the microswitch 12 is turned on.
is off and the output side of the NOR gate 27 and the other input side of the NOR gate 30 are at 1, so the flip-flop 25 continues to maintain its set state and no signal is input to the automatic pulse circuit 32.

In this way, when the reaping section continuously descends and reaches a predetermined height position close to the ground, the microswitch 12 is turned on, the capacitor 28 is discharged, and the input side of the inverter 29 becomes O.

Therefore, along with the output side of the inverter 29, the NOR gate 2
7 becomes 1 and the output side of the NOR gate 27 becomes 0, so the output side of the NOR gate 30 and the reset input side of the flip-flop 25 become 1,
The flip-flop 25 enters the reset state of 1,0.

On the other hand, one input side of the NOR gate 31 is 0 because the height sensor 10 is turned on and grounded, so both input sides of the NOR gate 31 are O and the output side is 1. A signal is input to the automatic pulse circuit 32.

At this time, the output signal of the flip-flop 25 allows the OR
The output side of gate 21 becomes 1, and flip-flop 1
8 is now reset, so that no signal passes from flip-flop 18 to transistor 23.

In this way, the continuous lowering by the flip-flop 18 is no longer performed, and instead, a pulse signal is generated from the automatic pulse circuit 32, and the conduction of the transistor 23 and the energization of the lowering solenoid valve 24 are performed in a pulsed manner.
As a result, the reaping section is gradually lowered from now on in a pulsed manner.

When the reaping section reaches a certain height close to the ground, the height sensor 10 is turned off and one input side of the NOR gate 31 becomes 1, so that the output side and the input side of the automatic pulse circuit 32 become 1. becomes O, automatic pulse circuit 3
From 2 onwards, the pulse signal will no longer be output.

The transistor 23 then becomes non-conductive, the lowering solenoid valve 24 is de-energized, and all lowering operations are completed and the reaping section is held in that position.

As is clear from the above description, the reaping section height control device of a combine harvester according to the present invention includes a lowering operation switch that lowers the reaping section from a raised position, and a lowering operation switch that lowers the reaping section by this switch and moves it closer to the ground. A detection mechanism that operates at a position higher than the cutting height setting range during reaping work, and when the reaping section further descends from the detection position by this detection mechanism and reaches a predetermined cutting height, it operates and stops the descending of the reaping section. and a lowering control system that continuously lowers the reaping section until the detection mechanism operates, and gradually lowers the reaping section in a pulsed manner after the detection mechanism operates. Since the reaping part descends, the height is detected by the detection mechanism near the ground, and the descending speed changes.
It is easy to align the rows (cutting width) of the reaping section before entering the next reaping row.
The mowing section is lowered in pulses to the working height after confirming whether there are any obstacles (obstructions, hardness of the ground, etc.), the hardness of the ground, etc.), which saves time and allows the mowing height setting to be adjusted accurately and automatically. It can reliably prevent the cutting rod from digging into the ground due to high mowing or cutting too low.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a combine to which the present invention is applied, Fig. 2 is an enlarged view of the part marked ■ in Fig. 1, Fig. 3 is an enlarged view of the part marked ■ in Fig. 1, and Fig. 4 The figure is a circuit diagram showing an embodiment of a reaping section height control device according to the present invention. 1... Traveling device, 2... Airframe, 3...
... Reaping section, 4 ... Threshing section, 5 ...
・Cutter device, 6... Reaping frame, 6...
・・・End part, 7・・・Dividing rod, 8・・・・・・
Raising device, 9...Sensing lever, 10...
... Height sensor, 11 ... Chassis frame,
12...Micro switch, 13...
Movable contact, 14...Protrusion, 15...Descent operation switch, 16,19,26゜28...Capacitor, 17,20,29...Inverter,
is, 25...Flip-flop, 21...
...OR gate, 22,33...diode, 23...transistor, 24...
Lowering solenoid valve, 27, 30.31...
・NOR gate, 32... automatic pulse circuit.

Claims (1)

[Claims] 1. A lowering operation switch that lowers the reaping section from the raised position, a detection mechanism that operates the reaping section at a position higher than the mowing height setting range during reaping work when the switch lowers the reaping section and approaches the ground, and this detection mechanism a height sensor that operates to stop the lowering of the reaping section when the reaping section further descends from the detection position by the mechanism and reaches a predetermined cutting height; and a height sensor that operates to stop the lowering of the reaping section until the detection mechanism operates. 1. A height control device for a reaping section of a combine harvester, comprising a lowering control system that continuously lowers the reaping section and, after the detection mechanism is activated, gradually lowers the reaping section in a pulsed manner.