JPS5934089B2 - Automatic cutting height control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic cutting height control device suitable for application to a combine harvester.

In a combine harvester that automatically reaps the shell culm and threshes the grain, the reaping section that reaps the shell culm is held in a non-working position above the ground when not working, and is lowered and brought closer to the ground when working. It is designed to be held in the working position.

The cutting section held at the working position automatically moves up and down depending on the unevenness of the ground, and the cutting height is automatically controlled so that the root of the culm is always cut at a constant height.

The automatic cutting height control device for a conventional combine harvester starts operation after the combine moves forward and enters a group of standing culms, and the culm sensor detects the culms.

For this reason, the reaping section enters the upright culm group in the upper non-working position and immediately descends to the working position, but the combine moves forward even during this descending period, so until the reaping section descends to the working position. During this period, the culm will be harvested at a higher than normal height.

As a result, there was a drawback that the culm was inevitably cut at a high level when the cutting operation was started.

In addition, regardless of the detection by the culm sensor, if the cutting unit is lowered to the working position before entering the erect culm group, the cutting body may fall into the ground or the straw may be scraped into the cutting and conveying unit. There was a problem that

This invention was devised to eliminate these conventional drawbacks, and its purpose is to automatically control the cutting height of the cutting section at the start of cutting work, and to reduce the height of the culm. To provide an automatic cutting height control device which prevents cutting from occurring.

In order to achieve such an object, the present invention is configured such that when the reaping section is lowered from a non-working position to a working position, the holding switch is operated to temporarily hold the reaping section at a predetermined height. This is what I did.

Hereinafter, this invention will be explained in detail based on examples.

FIG. 1 is a side view of a combine harvester equipped with an embodiment of an automatic cutting height control device according to the present invention.

In the figure, 1 is a branching rod fixed to the tip of the support 2;
3 is a weeding rod fixed to the tip of the weeding rod 1; 4 is a pulling device for raising the culm guided by the weeding rod 3; and 5 is attached to the tip of the support 2. A clipper-shaped cutting part, 6 a cutting height sensor attached to the dividing rod 1, 7
8 is the actuator of the cutting height sensor 6 whose tip is in contact with the ground, 8 is the root feeding device that transports the culm cut by the cutting section 5 upward, 9 is the same tip feeding device, and 10 is the culm that has been transferred. A feeding device for supplying the shell culm to the threshing section 11, 12 a supply depth control device for adjusting the depth at which the shell culm is supplied to the threshing section 11, and 13 a feeding depth control device for vertically rotating the support 2. A hydraulic cylinder, 14 a driving body that moves up and down in conjunction with the support 2, 15 a holding switch that is operated by being pushed by the driving body 14, and 16 a traveling device.

Note that the figure shows a state in which the reaping section 5 is in the working position.

In such a configuration, when the traveling device 16 operates and the combine moves forward, the culm is guided by the cutting body 3 and enters.

The culm that has entered in this way is pulled up by the lifting device 4, and then the root is cut off by the cutting unit 5.

The cut culm is transferred to a root feeding device 8 and a tip feeding device 9.
After being supported and transported by the feeding device 10, the grain is fed to the threshing section 11, where the threshing operation is performed.

Here, when performing reaping work, if the ground is uneven and the height of the ground surface where the traveling device 16 is located and the ground surface where the reaping unit 5 is located is different, if the culm is reaped with the same working device, the height of the culm will be high. This will result in low mowing.

For this purpose, the cutting height sensor 6 is operated to detect the height of the cutting section 5 from the ground, and based on this detection result, the hydraulic cylinder 13 is operated to move the support body 2 up and down. The cutting height is automatically controlled so that the cutting height 5 is always at a constant height from the ground.

Next, the operation of the cutting height sensor 6 will be explained in detail with reference to FIG.

FIG. 2 is an explanatory diagram of the operation of the cutting height sensor.

Although not shown in FIG. 2, the cutting height sensor 6 operates depending on the rotational position of the actuator 7.

It has two switches: an auto-up switch and an auto-down switch.

When the combine harvester is not performing reaping work, the hydraulic cylinder 13 is operated to rotate the support body 2 upward,
The reaping section 5 is held in an upper non-working position.

In this way, when the reaping section 5 is in the non-working position, the tip of the actuator 7 is not in contact with the ground and is therefore in the position shown by the dotted line due to the spring force.

When the reaping section 5 is in the working position, the tip of the actuator 7 contacts the ground and rotates depending on the height of the ground, changing its position.

The automatic up switch is turned on when the actuator 7 is in the range U, and the automatic down switch is turned on when the actuator 7 is in the range D.

Therefore, when the actuator 7 is in the range N, both switches are in the off state.

When it is within this range of N, the reaping section 5 is at a normal height from the ground.

Next, the operation of the holding switch 15 shown in FIG. 1 will be explained.

The holding switch 15 is in the OFF state when the support body 2 is rotated upward and the reaping section 5 is in the non-working position, but when the support body 2 is rotated downward and the reaping section 5 is lowered, When it descends to a holding position at a predetermined height slightly higher than the working position, it is pushed by the driver 14 and turned on.

The height of this holding position is set to an appropriate value that is low enough that the reaping section 5 can be lowered to the working position in a short time, and high enough that straw etc. do not get in the way of the reaping section 5 during travel.

FIG. 3 is a circuit diagram of the control circuit.

In the figure, 6u is an automatic raising switch for the cutting height sensor 6, 6d is an automatic lowering switch, 20u is a manual raising switch operated manually by the operator from the driver's seat, 20d is a manual lowering switch, and 21 is a pulse generator. Vessel, 22.
23 is a flip-flop circuit.

First, when the reaping section is in the non-working position, only the automatic lowering switch 6d is on and the other switches are off.

In this case, since the automatic rise switch 6u is turned off, one of the input inputs of the NAND circuit G1 is 1", so its output becomes 10", and the transistor TR1 is turned off.

Also, since the output of the flip-flop circuit 22 is 10" and the output of the flip-flop circuit 23 is 1",
When the holding switch 15 is turned off, one input of the NAND circuit G2 becomes 11", but since the other input is 10", its output becomes "1", and furthermore, when the automatic lowering switch 6d is turned on, the NAND circuit G3 becomes the first The input is 0", but since the third input is 11", its output is 0.

The output of this NAND circuit G3 is 11 at inverter INV1.
“, so the NAND circuit G4 is 11
", and its output becomes "O", and the transistor TR
2 is also turned off.

Here, when the manual lowering switch 20d is turned on by the first activation, the impark is reversed by 1N2, and ``1'' is input to the flip-flop 22, and its output is 11''.
become.

The output 11'' of the flip-flop 22 is maintained as it is even if the manual lowering switch 20d is turned off.

As a result, the NAND circuit G2 becomes ``1'' with the meat input, so its output becomes 10'', and as a result, the NAND circuit G4
The output power becomes 1", the transistor TR2 is turned off, and a current flows through the lowering solenoid Sd.

When the lowering solenoid Sd is energized, the hydraulic cylinder 13 shown in FIG. 1 is operated to rotate the support body 2 downward, and when the reaping section 5 eventually comes to the holding position, the holding switch 15 is turned on.

When the holding switch 15 is turned on, one input of the NAND circuit G2 becomes "0", so its output becomes 'X 1',
As a result, the output of the NAND circuit G4 becomes O", the transistor TR2 is turned off, the hydraulic cylinder 13 stops operating, the support body 2 stops, and the reaping part 5 is held at the holding position.

In this state, the combine moves forward and approaches the erect culm group.

Then, just before the reaping work starts, the manual lowering switch 2
A second operation of 0d is performed.

When the manual lowering switch 20d is turned on again by the second operation, the Noah circuit G5 is already at one input force 5 (S □" with the holding switch 15 turned on, so the meat input is also 'XO' and its output is It becomes 11".

As a result, one input of the NOR circuit G6 becomes 11", so its output becomes 10", and furthermore, the NOR circuit G7 becomes
In the operation when the output of the flip-flop 22 becomes 91", one of the inputs becomes 0", so both the meat inputs become 0" and the output becomes 1".

This "1" input causes the flip-flop 23 to perform an inverting operation and its output becomes 10".

Incidentally, by this operation, the flip-flop 22 is also reset and performs an inverting operation, so that its output returns to NO".

On the other hand, the output of the NAND circuit G8 becomes "1" due to the input power cost O" on one side, and the pulse generator 21 is in an operating state and outputs a pulse signal.

Therefore, the second human power of NAND circuit G3 is 10".

11 “Repeat the state.

As a result, the NAND circuit G3 periodically changes all inputs to 'X□“
Therefore, the output becomes 11", and this output is inverted by the inverter INV1 and becomes 0", so the output of the NAND circuit G4 periodically becomes 11" and the transistor TR
2, an intermittent current flows through the lowering solenoid Sd which repeats on and off states.

As a result, the hydraulic cylinder is operated and the reaping section is intermittently lowered and set at the working position.

When the cutting section is set at the working position, the tip of the actuator 7 of the cutting height sensor 6 contacts the ground and rotates to enter the range N shown in FIG. 2.

As a result, the automatic lowering switch 6d is turned off, the NAND circuit G3 becomes the first manual power input 1" and its output becomes 10", so the transistor TR2 is turned off and the lowering of the reaping section is stopped, and the operation is normal. Reaping work is carried out at a suitable cutting height.

Note that when the reaping section is working in the working position, normal automatic cutting height control is performed.

That is, if the reaping section is too high relative to the ground, the automatic lowering switch 6d is turned on and the reaping section is intermittently lowered to the normal cutting height by the same action as described above. When is too low to the ground, the automatic lift switch 6u is turned on and the output of the NAND circuit G1 becomes 11" periodically.
The transistor TR1 repeats on and off states, and an intermittent current flows through the raising solenoid Su, causing the reaping section to rise intermittently to its normal height.

Moreover, when the reaping part is raised to the non-working position after the reaping work, when the manual lift switch 20u is turned on, one input force of the NAND circuit G9 becomes O", its output becomes "1", and the flip-flop The pull circuit 23 is set and its output becomes 91".

As a result, the output of the NAND circuit G3 becomes "0", and the output of the inverter INV becomes "1".

In addition, since the output of the flip-flop circuit 22 is held at ``0'', the output of the NAND circuit G2 becomes ``1'', and thereby the output of the NAND circuit G4 becomes 10'', and the transistor TR2 remains in the off state. .

At the same time, by turning on the manual rise switch 20u, the output of the inverter 1N■3 becomes 1", so the transistor TR
1 is turned on, and the reaping section immediately rises to the non-working position.

In the above embodiment, a holding switch was provided and turned on to keep the reaping section in the holding position, but the first operation of the manual lowering switch activates the timer and after a certain time has elapsed, a stop signal is sent. It is also possible to output this to stop the lowering of the reaping section and keep it in the holding position.

In this case, the timer time is set to an appropriate value such that the holding position is the same as in the previous embodiment based on the average descending speed of the reaping section.

As described above, according to the automatic cutting height control device according to the present invention, automatic cutting height control of the cutting section can be smoothly performed by the operator only by operating the manual lowering switch twice at the start of the cutting operation. , and has the effect of preventing high mowing of the culm and raking of waste straw.

[Brief explanation of drawings]

Fig. 1 is a side view of a combine harvester equipped with an embodiment of the automatic cutting height control device according to the present invention, Fig. 2 is an explanatory diagram of the operation of the cutting height sensor, and Fig. 3 is a circuit diagram of the control circuit. . 1... Branching rod, 2... Support, 3...
・・・Segregation body, 4...Triggering device, 5...
... Reaping section, 6 ... Cutting height sensor, 7 ...
...Actuator, 13...Hydraulic cylinder,
14...Driver, 15...Holding switch, 6u...Automatic lift switch, 6d...
・Medium movement lowering switch, 20u...Manual rising switch, 20d...Manual lowering switch.

Claims (1)

[Claims] 1. In an automatic cutting height control device that automatically controls the reaping part to a predetermined height from the ground at a working position, when the reaping part is lowered from an upper non-working position to the working position, the lowering A holding switch is provided that operates when the manual lowering switch reaches a predetermined position, and the first operation of the manual lowering switch lowers the reaping section from the non-working position to the position where the holding switch is activated, and stops the reaping section, and the second 1. An automatic cutting height control device, characterized in that the cutting section is lowered to the working position during operation.