JPS5835645B2 - Manual priority mechanism of cutting height adjustment device in combine harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual override mechanism for a cutting height adjustment device in a combine harvester.

Conventionally, switching between an automatic control state and a manual control state in controlling the cutting height of a combine harvester is known, for example, from Japanese Patent Laid-Open No. 52-47428 and Japanese Patent Laid-Open No. 52-34226.

By the way, the need to switch between automatic control and manual control of the cutting height arises in the following cases.

In other words, ■ When harvesting is being carried out under automatic cutting height control and the operator discovers irregularities in the field, the cutting height is adjusted by manual control instead of automatic control (
In the automatic cutting height control state, control is often delayed to prevent punching or the like, and in such cases, a response delay occurs to sudden changes.

■ When harvesting under automatic cutting height control, if a worker discovers an obstacle such as a pebble or earth mound in the field,
When manually controlling the reaping section to raise it in order to avoid deformation or damage due to contact or thrusting of the reaping section ■ When the combine harvester is driven over the ridge into the next section after harvesting one section. There may be cases where the operator notices that the automatic cutting height is being controlled and manually raises the cutting section to prevent it from falling into the ridge. Urgency and precision are required to avoid deforming or damaging the parts.

It is also necessary to have a function to reliably return to the automatic control state after manual operation is completed.

On the other hand, JP-A No. 52-47428 describes a manually operated lever that creates a difference (potential difference) between the signal from the sensing body and the set value by changing the set value. The difference is detected by a comparison mechanism and a lift signal is issued, and the manual operation system uses the automatic operation system as is.

Therefore, even if manual operation is performed, the automatic control circuit will not turn off, so depending on the state of the sensing object at that time, a signal opposite to the manual operation may be issued, causing the operator to operate in the opposite direction to the operator's intention, or It often happens that the actuation amount is different from the one intended, or the circuit is damaged.

Furthermore, while comparing the amount of operation of the manual operating lever and the amount of elevation of the reaping section, if the amount of elevation is insufficient, it is necessary to operate the lever again, which also has the disadvantage that it cannot be done in time for emergencies.

On the other hand, in the device described in Japanese Patent Application Laid-Open No. 52-34226, when the manual automatic changeover switch is on the side-movement side, the reaping section does not descend simply by operating the manual lift lever to the down position, and then the sensing object Since the reaping section is configured to be lowered only while the lowering signal is issued, it does not have a so-called manual priority function.

As a result, if the complicated operation of turning the manual automatic changeover switch to the automatic side and then turning the manual operation lever to the lower position side is not performed correctly in this order, no matter how much the lowering signal is emitted from the sensor, the reaping unit will will not lower and automatic mowing height control will not function properly.

Further, once the manual lift lever is operated to the up position during automatic mowing height control, the automatic mowing height control state cannot be returned unless the lever is operated to the down position again.

As detailed above, in the past, urgency, accuracy,
As a manual priority mechanism for cutting height control that requires reliable return performance, it is extremely incomplete and is difficult and dangerous to operate.

In view of the above points, the present invention solves all the conventional drawbacks by connecting an automatic lifting control circuit and a manual lifting control circuit in parallel, and configuring the automatic lifting control circuit to be opened and closed by operating a manual switch. The purpose of the present invention is to provide a manual priority mechanism for a cutting height adjustment device that is highly practical.

Next, the embodiment shown in the drawings will be described.

FIG. 1 is a side view showing only the main parts of the carp pine. A machine base 2 is installed above the crawler 1. At the front, a hydraulic cylinder A is connected to the crawler 1 side, and the piston a side is connected to the machine base 2.
Piping is done to the upper hydraulic pump part 3 and the hydraulic cylinder A, and the machine base 2 is expanded and contracted by the hydraulic pressure of the hydraulic cylinder A.
The front part is configured to rotate around the fulcrum O and move up and down.

Further, a threshing section 4 is mounted above the machine stand 2, and a reaping section C is installed in front of the threshing section 4, and has a cutting section 5, a pulling section 6, a cutting blade 7 conveying device, etc. A control column 10 having a reaping latch lever 9 and the like is erected in front of the seat 8 on the right side of C, and is configured so that driving of the reaping part C can be started and stopped by important operation of the reaping latch lever 9.

A sled-shaped detection body B is installed below the reaping part C, in front of the cutting blade 7 and behind the grass divider 5, and the front part of the detection body B is located downward along the reaping frame 11. is pivoted to the reaping frame 11 around a support pin 12, and the upper part of the operating rod 13 extending upward from the center of the detection body B is pressed downward by a spring 14, so that the detection body B moves up and down. A sensor switch S1 for outputting a rising signal of the reaping section C having a sensor 1 is installed at the upper side of the cam body 15 provided on the operating rod 13, and a sensor switch S1 for outputting a rising signal of the reaping section C having the sensor 2 is installed at the lower side thereof. The cam body 1 is equipped with a sensor switch S2 for outputting a descending signal of C, and moves up and down together with the detection body B.
5 moves up and down to selectively operate sensor switches Sl and S2.

3 is a control valve that is piped to the hydraulic cylinder A, and has a rising valve section 16, a neutral valve section 17, and a descending valve section 16', and the solenoid 18 is connected to the rising valve section 16.
In addition, the solenoid 19 operates the lowering valve portion 16', and the control valve (3) is configured to communicate with the hydraulic pump 3a1'J leaf valve 20 and tank 21, respectively.

In addition, in FIG. 2, both sensor switches Sl,
Automatic lift control circuit from S2 to both solenoids 18.19 and manual switch S3, 84 to both solenoids 18.
22 is a power switch, 23 is a battery, and 19 manual lift control circuits are connected in parallel.
Reference numeral 24 denotes a manual/automatic changeover switch which is opened (turned on) during automatic control.

S3 is a two-pole manual switch for the lower part of the reaping section, and has a normally closed switch 25 and a normally open switch 25'; S4 is a two-pole manual switch for the upper part of the reaping section, and has a normally closed switch 2.
6 and a normally open switch 26'.

When the solenoid 18 operates the lifting valve section 16, the piston a moves upward due to the hydraulic pressure, the reaping section C rises due to the extension operation, and the solenoid 19 operates the lowering valve section 16.
When ' is operated, the weight of the machine causes the piston a to move downward, and the reaping operation lowers the reaping section C, allowing the reaping section C to be raised and lowered during harvesting work or when the machine turns.

Therefore, when the power switch 22 is turned on and the manual/automatic changeover switch 24 is closed (on) to enter the control state, if the distance between the field scene where there is a convex part and the reaping section C becomes small, The cam body 15 activates the sensor switch S1 to activate the solenoid 18 and raise the reaping section C as described above to adjust the cutting height, and when the distance between the field surface and the reaping section C becomes narrow, The cam body 15 operates the sensor switch S2 to operate the solenoid 19 to lower the cutting section C as described above, thereby making it possible to adjust the cutting height.

Even in such an automatic control state, manual switch S3
When is operated, the automatic lift control circuit is turned off by the electric circuit configuration, and manual operation is given priority, and the lowering operation of the reaping section C can be performed. Similarly, when the manual switch S4 is operated, the reaping section C can be operated upward.

When manual operation is interrupted, the automatic lift control circuit is immediately turned on and the automatic control state is restored.

In the case of manual control, open the manual/automatic changeover switch 24 (
After turning off), the reaping section C can be lowered or raised by operating the manual switch S3 or S4.

Also, manual switch S3. Since the reaping section C is configured to rise when S4 is operated at the same time, it is possible to prevent the danger of the reaping section C being pushed into the vehicle.

In this way, the present invention operates the reaping section C by the hydraulic cylinder A, which is telescopically operated by changing the oil path of the control valve (2).
For combine harvesters that adjust the cutting height by moving up and down,
An automatic lift control circuit that operates the valve (■) by a plurality of sensor switches Sl and S2 that operate in accordance with the vertical movement of the sensing body B provided in the reaping section C, and operates the valve (■) by manual switches S3 and S4. A manual automatic changeover switch 24 is interposed in the electric circuit in which the manual lift control circuit and the manual lift control circuit are connected in parallel, and the manual switch S3. S
Since the automatic lifting control circuit is configured to open and close by the operation in step 4, it is possible to configure a cutting height adjustment device equipped with a manual priority mechanism that operates accurately even in an emergency and returns reliably. It avoids danger and protects the reaping section, and has features that are excellent in operability and practicality.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the main parts of the combine harvester, and FIG. 2 is an explanatory diagram showing the electric circuit. ■...Control valve, A...Hydraulic cylinder, C...Reaping section, B...
Sensing body, Sl, Sl...Sensor switch, S
3. S4...Manual switch, 24...
Manual automatic changeover switch.

Claims (1)

[Claims] 1 In a combine harvester that adjusts the cutting height by moving the reaping section C up and down using a hydraulic cylinder A that expands and contracts by changing the oil path of the control valve (■), it is activated in accordance with the vertical movement of a sensing body B installed in the reaping section C. an automatic lift control circuit that operates the valve (2) by a plurality of sensor switches Sl, S2, and a manual switch S3. A manual automatic changeover switch 24 is interposed in an electric circuit connected in parallel with a manual lift control circuit that operates the valve V by S4, and the manual switch S3. A manual priority mechanism for a cutting height adjustment device, characterized in that the automatic elevation control circuit is configured to open and close by operating S4.