JPS6124004Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a setting mechanism that changes and sets the appropriate height or appropriate work load as an electric signal, and is configured to be operable with a finger-operated disk-shaped rotary operating tool.
A working device connected to the traveling machine so that it can be driven up and down,
Regarding an automatic lift control device for a work vehicle configured to automatically control the lift to a height set by the setting mechanism or a height that brings about a set work load, an operation structure of a setting mechanism configured using a volume etc. The aim is to improve this so that it can be used satisfactorily over a long period of time.

The above-mentioned automatic elevation control device changes and sets an appropriate height or appropriate work load to a setting mechanism as an electric signal by operating a disc-shaped rotating operating tool with a finger, and adjusts the setting mechanism to the set height or set work load. By automatically raising and lowering the working device to a height that provides a load, the working device can be raised and lowered accurately to a desired position with simple operation, or
It is possible to avoid overloading the work equipment, but the conventional one
There was a problem with the operating structure of the setting mechanism.

In other words, in the past, the setting mechanism was operated using a disk-shaped rotary operating tool that protruded from the operating panel and was rotatably supported around an axis perpendicular to the surface direction of the panel, but in this case, A large space is required on the outside of the periphery of the rotary operating tool as a space for the fingers to pass through when picking up and rotating the operating tool, which is a disadvantage that it is difficult to arrange it compactly with other operating tools on the operating panel part. Moreover, since it protrudes far beyond the operation panel, it is easy for other objects to come into contact with it, and as a result, there is a risk of erroneous operation or damage. Further, such an automatic lift control device is sometimes operated while the work vehicle is running, and it is easy to operate the device incorrectly even when the vehicle is operated in an unstable posture due to vibrations of the vehicle body or the like.

The present invention has been made with the above-mentioned circumstances in mind, and in an automatic lifting control device for a work vehicle having the above-mentioned structure, the disc-shaped rotary operating tool is mounted inside the operating panel in the direction of the surface of the operating panel. It is rotatably supported around an axis along the operating panel, and only a part of the outer periphery in the circumferential direction is exposed through a hole formed in a bent part that protrudes outward of the operation panel, and the disk-shaped rotation operation is performed. It is characterized by an arm rest attached to the rear of the device and on the side of the driver's seat.

In other words, the setting mechanism can be operated using a disc-shaped rotary operating tool that is rotated by moving a finger within a small range that touches the periphery through a hole formed in the operating panel, which requires a large space for operation. The inconveniences of the conventional structure can be solved, and since only a part of the circumference of the rotary operating tool is exposed through the hole formed in the bent part that protrudes outward from the panel, other objects cannot be exposed. It is difficult to approach,
Although it is possible to avoid problems with conventional structures where there is a risk of erroneous operation or damage due to contact with other objects, the circumferential length of the rotary operating tool exposed on the panel is longer, making it difficult to It can be operated over a wide range with just one finger. Furthermore, since an elbow rest is provided at the rear of this rotary operating tool, even if the work vehicle is in an unstable position while moving, changes and settings can be made in a stable position with the elbow resting on the elbow rest. By improving the operation structure for the setting mechanism, an automatic lift control device for a work vehicle has been obtained which can be used satisfactorily over a long period of time as a whole.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a side view of a riding type ground work machine in which a plow 2 is installed at the rear of a tractor 1. The plow 2 is connected to the tractor 1 so as to be movable up and down by a three-point link device consisting of an upper top link 3 and a pair of left and right lower links 4, 4, and the lower links 4, 4 are connected to the rear end of the tractor 1. A pair of left and right lift arms 5, 5 provided at The plow 2 is driven up and down by the expansion and contraction operation of the hydraulic cylinder 7.

Next, a device for automatically controlling the raising and lowering of the plow 2 will be explained.

That is, an angle detection device 8 detects the swing angle of the lift arm 5 with respect to the tractor 1 as the height of the plow 2 with respect to the tractor 1, and extracts this as an electric signal, and a tensile force acting on the lower link 4 is detected. A load detection device 9 is provided which detects the work load of the plow 2 and extracts it as an electric signal.
As shown in the figure, a control case 12 is bolted to the inner surface of the rear wheel fender 11 located on the right side of the driver's seat 10 of the tractor 1, and inside this case 12, as shown in FIG. from the first volume 13 as a mechanism for changing and setting the appropriate height of the plow 2 as an electric signal, the second volume 14 as a mechanism for changing and setting the appropriate work load of the plow 2 as an electric signal, and both the detection devices 8 and 9. A control box 15 is provided with various electric devices for discriminating these signals and operating an electromagnetic control valve (not shown) for the cylinder 7. It is provided.

The plow 2 is configured to be automatically raised and lowered so as to approach the work load set by the second volume 14 while the height set by the first volume 13 is regulated to the lowest limit height. There is.

Note that if the first volume 13 is set to the lowest limit of the changeable setting range, the second volume 14
The plow 2 is automatically controlled to raise and lower so as to maintain the workload set in The plow 2 is automatically controlled to raise and lower so as to maintain the height set in .

Next, the operating structure of the first and second volumes 13 and 14 will be explained based on FIGS. 4 and 5.

That is, an operation panel 12a, which is bent into a dogleg shape when viewed from the side and has an operation position display plate 25 attached thereto, is bolted to the front end of the upper wall of the control case 12. This panel 12
It is rotatably supported in the inside of the panel 12a around the same horizontal axis X along the surface direction of the panel 12a, and only a part of the outer circumference in the circumferential direction is formed into a bent part that protrudes outward of the panel 12a. A pair of left and right holes 16 and 17 formed
More exposed finger-operated disc-shaped rotary operating tool 1
8, 19 are provided, and these rotary operating tools 18, 1
9 are fixed to the operating shafts 13a and 14a of the first and second volumes 13 and 14, respectively. Incidentally, scale plates 24, 24 are attached to the circumferential portions of both the operating tools 18, 19, respectively, for displaying the rotational operation position along the circumferential direction.

In addition, 20 in the figure indicates a first state in which the automatic elevating control is activated, a second state in which the control operation is stopped and the plow 2 is forcibly raised, and a third state in which the control operation is stopped and the plow 2 is forcibly lowered. The operating tool 20a is configured to be swung back and forth between a position A corresponding to a first state, a position U corresponding to a second state, and a position D corresponding to a third state. has been done. 21 is a volume for adjusting control sensitivity, and its operating tool 21
a is configured to be rotated around an axis perpendicular to the surface direction of the panel 12a. Also, 2 in the diagram
Reference numeral 2 denotes an accessory case that is fitted and fixed to the rear end of the upper wall of the control case 12, and the upper part of the accessory case is covered with an arm rest 23 that can swing up and down with the rear end as a fulcrum P. ing.

In the embodiment, a configuration in which both the height setting mechanism 13 and the load setting mechanism 14 are provided is illustrated, but it may be implemented in a configuration in which only one of them is provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic lift control device for a work vehicle according to the present invention, in which Fig. 1 is a side view of a riding type ground-based work machine, Fig. 2 is a schematic front view of the driver's seat mounting part, and Fig. 3 is a control device. FIG. 4 is a partially cutaway side view of the case mounting portion, FIG. 4 is a plan view of the operation panel portion, and FIG. 5 is a longitudinal sectional front view showing the mounting portions of the first and second volumes. 1... Traveling body, 2... Working device, 10... Driver's seat, 23... Elbow rest, 12a... Operation panel,
13, 14... Setting mechanism, 16, 17... Hole, 1
8, 19...Rotary operating tool, 24, 24...Scale plate.

Claims (1)

[Claims for Utility Model Registration] The setting mechanism 13 or 14 for changing and setting the appropriate height or appropriate work load as an electric signal is configured to be operable with a finger-operated disk-shaped rotary operating tool 18 or 19, and A working device 2 connected to the machine body 1 so as to be able to be driven up and down is connected to the setting mechanism 13.
or 14, an automatic lifting control device for a work vehicle configured to perform automatic lifting control to a height set in step 14 or a height that provides a set work load, wherein the disc-shaped operating tool 18 or 19 is connected to an operating panel. Operation panel 12 inside 12a
A hole 16 or 17 that is rotatably supported around an axis along the surface direction of a, and that only a part of the outer circumference in the circumferential direction is formed in a bent part that protrudes outward of the operation panel 12a. The driver's seat 1 is exposed more to the rear of the disc-shaped rotary operating tool 18 or 19.
An automatic elevation control device for a working vehicle, characterized in that an armrest 23 is attached to the side part of the vehicle. Automatic lifting and lowering of a work vehicle according to claim 1, wherein scale plates 24, 24 are attached to the circumference of the disk-shaped rotary operating tool 18 or 19 to display the rotational operating position along the circumferential direction. Control device.