JPH0160214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reaping harvester equipped with an operating tool for raising and lowering a reaping section relative to a vehicle body.

In such a reaping/harvesting machine, if the stem culm to be reaped has locally fallen down, the reaping section must be lowered to a lower height than the height above the ground during normal work to avoid leaving uncut parts. When lowering the reaping section, it is necessary to pay sufficient attention to the operation in order to avoid the problem of the reaping section coming into contact with the field surface. However,
An unskilled person may continuously perform lowering operations over a large range without realizing that the operating condition is likely to cause such trouble.
As a result, there was a risk that the reaping unit that was lowered would collide with the field and be damaged.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reliably avoid troubles associated with lowering the reaping section by adding a simple structure. .

A feature of the reaping harvester according to the present invention is that the height of the reaping section above the ground is below a set height, and the reaping section is provided with a manual lowering operation state notification mechanism that automatically operates only when the reaping section is in a manual lowering operation state. The point is that

Next, the effects of the characteristic configuration of the present invention will be described.

In other words, when the height of the reaping section from the ground is below the setting, if the reaping section is manually lowered,
A notification mechanism is used to notify the operator that the lowering operation is in progress, and to alert the operator.

Therefore, the operator must be fully aware that the lowering operation is in a dangerous range where there is a risk of the reaping unit coming into contact with the field, and this may cause the trouble of causing the lowering operation of the reaping unit to collide with the field. This can be done safely while avoiding this.

More specifically, as means for achieving the same object as the present invention, the notification mechanism may be activated only when the reaping section is manually lowered, or the notification mechanism may be activated when the reaping section is lowered from the ground. There are ways to make it work as long as it is below the set height, but according to those means, for example, in the case of the former, it is unnecessary even when the height of the cutting section above the ground is higher than the set height. Also, in the latter case, due to unnecessary notifications being made even though there is no lowering operation state,
Although there is a disadvantage in that it is not possible to reliably call the worker's attention, according to the present invention, by reliably giving the worker's attention only when necessary, safe work can be carried out by reliably avoiding the risk of accident. It is something that can be done.

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

As shown in Fig. 1, at the front of the vehicle body equipped with a crawler traveling device 1, a threshing device 2, a driver's seat 3, etc., there is a device 4 for pulling up stems planted in the field, and a device 4 at the front of the lower end thereof. The reaping section A is equipped with a weeding tool 4A for positioning, a reaping section 5 for cutting the base of the raised stalk culm, a device 6 for conveying the reaped stalk culm to the rear, etc., by a single-acting fluid pressure cylinder 7. The height of the reaping section A from the ground, that is, the height of the reaping section A, can be adjusted by adjusting the height of the reaping section A from the ground. The combine harvester is configured so that the height can be changed freely.

As shown in FIG. 2, a swinging arm 10 that locks the neutral return biasing control valve 9 with respect to the fluid pressure cylinder 7 is attached to a support shaft 11 that rotates integrally with the operating lever 8, so that it can rotate freely relative to the swing arm 10. A locking pin 13 that is externally fitted and inserted into a notch 12 formed in the boss portion of the swing arm 10 to lock and swing the swing arm 10 is rotatable around the support shaft 11 once. Attach the control lever 8 to the lifting stop position N, the lowering operation position D, and the raising operation position U.
The structure is such that the reaping section A can be manually raised and lowered when the switching operation is performed, and the operating lever 8
, to an automatic control position G between the lowering operation position D and the raising/lowering stop position N, the lowering/lowering operation can be automatically performed to maintain the reaping part A at the set height above the ground by the control device described later. It's like this. However, 14 in the figure is a ball that engages with the boss portion of the operating lever 8 to hold the operating lever 8 in the lifting stop position N or the automatic control position G, and is held on the engagement side by a spring 15. is energized. Also, 16
is a two-position switching valve interposed between the fluid pressure cylinder 7 and the control valve 9, and when the operation lever 8 is operated to the automatic control position G or the downward operation position D, the flow path is opened. , and the operating lever 8
The locking pin 13 is elastically flexible so that when the cylinder is operated to the lift stop position N or the lift operation position U, the check valve can switch to a state in which the return of fluid from the hydraulic cylinder 7 is blocked. They are connected via a rod 17 with a leaf spring 17a.

Next, the elevation control device will be explained.

As shown in FIGS. 1 and 2, a transmitter 18a that intermittently projects ultrasonic waves toward the ground, and
Receivers 18b for receiving the ultrasonic waves reflected from the ground are provided at the back of the weeding tool 4A, and lowering and rising electromagnetic solenoids 19A and 19B for operating the control valves are provided. Then, the transmitter 18a is operated intermittently by a timing signal from a control arithmetic unit 20 consisting of a microcomputer, and the height of the reaping section A above the ground is determined by the time it takes for the projected ultrasonic waves to reach the receiver 18b. The height (cutting height) is determined by the control calculation device 20. Subsequently, the control arithmetic unit 20 compares the height above the ground discrimination result with the signal set in the height above the ground setting device 21, and determines whether lifting is not necessary, rising is necessary, or descending is necessary, and the judgment result is Based on this, the drive circuit 2 for both the electromagnetic solenoids 19A and 19B
2, and is configured to automatically move up and down so that the height of the reaping section A above the ground is maintained within a set height range.

The activation operation switch 23 of the elevation control device,
The control lever 8 is provided so as to be pressed by a cam portion 24 formed on the lever boss portion so that it is engaged and operated when the control lever 8 is in the range between the automatic control position G and the lowering operation position D. The structure is configured such that the start and stop operations of the reaping section A can be performed by the elevating lever 8, and while making advantageous use of the elevating control device, the height of the reaping section A from the ground is below the set height, and the reaping section A
A manual lowering operation state notification mechanism H is configured which automatically operates only in the manual lowering operation state.

To explain the notification mechanism H in detail, the raising electromagnetic solenoid 19B acts as a device that pulls the raising/lowering operation lever 8 toward the raising/lowering stop position U while allowing movement toward the lowering operation position D. The solenoid 19B is automatically switched to the operating state only when the height above the ground of the reaping section A is below the set height above the ground, and thus when the height above the ground of the reaping section A is below the set height above the ground. In this case, a large force is required to move the lift operation lever 8 to the lower operation position D and to maintain the lift operation lever 8 in the lower operation position D, thereby increasing the height above the ground. It is configured so that it can notify the state of manual lowering operation when it is below the setting.

In the embodiment described above, the elevation control device is constructed by calculating the average values of the heights above the ground detected at appropriate set time intervals, and performing the elevation control while comparing the calculation results with the set height above the ground. If this is done, it may be possible to eliminate unnecessary lifting and lowering controls for convex portions and concave portions that suddenly appear in the field. Furthermore, the automatic control position G may be eliminated if the operating lever 8 is used as an operating tool for starting and stopping the control device. In other words, as shown in FIG.
The switch 25b, which issues a stop command signal each time it is pressed in at the lower operation position 25b, is arranged so that it is operated at the upper operation position U, and thereby the start of the reaping operation and the like. The control device may be started and stopped in accordance with the operation of the control lever 8 upon completion of the process.

Next, another example will be described.

For example, in the above embodiment, when the control activation switch 23 is provided so as to be pressed in only when the operating lever 8 is in the automatic control position G, as shown in FIG. The height above the ground of the reaping section A is set to the set height above the ground based on the lever position detection switch 27 which is pressed into the alarm device 26 when the operating lever 8 is in the lower operating position D and the information from the control calculation device 20. In the following, the notification mechanism H may be configured so as to be automatically switched to the operating state only when the operating lever 8 is operated to the lower operating position D.

Further, although the present invention is suitable for a reaping harvester such as a combine harvester equipped with a lifting control device, it can also be applied to a type in which the reaping section A is raised and lowered only manually.

Furthermore, in carrying out the present invention, the height of the reaping section A above the ground may be detected in a non-contact manner using ultrasonic waves or the like, or alternatively may be detected using a ground sensor that can be raised and lowered relative to the reaping section. .

Furthermore, in the embodiment, the electromagnetic solenoid 19B is used as an example of a device for pulling the lever 8, but the specific structure of the lever pulling device can be modified in various ways, such as by combining a friction transmission mechanism and an electric motor.

[Brief explanation of drawings]

The drawings show an embodiment of the reaping harvester according to the present invention, and FIG. 1 is a side view of the front part of the combine, FIG. FIG. 3 is a side view showing a modification, and FIG. 4 is a schematic diagram of another embodiment. 7... Lifting drive device, 8... Lifting operation tool, 1
9B... Lever tension device, 26... Alarm device, A
... Reaping section, H ... Notification mechanism, D ... Lowering operation position, N ... Lifting stop position.

Claims (1)

[Scope of Claims] 1. A reaping harvester equipped with an operation tool 8 for raising and lowering the reaping part A relative to the vehicle body, wherein the height of the reaping part A from the ground is less than or equal to a set height, and the reaping part A This reaping harvester is equipped with a manual lowering operation state notification mechanism H that automatically operates only in the manual lowering operation state. 2. The elevating operation tool is an elevating operating lever 8 that operates an elevating drive device 7 of the reaping section A,
In configuring the notification mechanism H, a device 19B that pulls the lifting operation lever 8 toward the lifting stop position N side while allowing the movement toward the lowering operation position D side is connected to the device 19B when the height above the ground of the reaping section A is set. The reaping harvester according to claim 1, wherein the reaping/harvesting machine is provided so as to be automatically switched into operation only when the height is below. 3. The alarm device 26 constitutes the notification mechanism H.
A patent in which the height above the ground of the reaping section A is below the set height above the ground, and the operating state is automatically switched to the operating state only when the operating tool 8 is operated to the lower operating position D. A reaping harvester according to claim 1.