JPH0349521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a working machine tilting device for a power agricultural machine, which connects the working machine via a link mechanism so that the working machine can tilt laterally and tows the working machine.

When towing a working machine with a power agricultural machine to remove ridges, etc., the work of changing and adjusting the inclination of the working machine is as follows:
Conventionally, the angle adjustment lever was manually operated, which took time.

In view of these circumstances, the present invention automates the above-mentioned inclination angle adjustment work, and includes a plurality of inclination angle setting means capable of setting the inclination angle of the working machine as an electric quantity, and the plurality of inclination angles. A changeover switch is provided to select one of the setting means, and a sensor is attached to the hydraulic cylinder for adjusting the inclination angle of the working machine to detect the extension amount of the piston rod as an electric quantity, and the electric quantity detected by this sensor and the above-mentioned electric quantity are attached. Comparing means for comparing the quantity of electricity set by the inclination angle setting means is provided, and the output of the comparison means is used to automatically control the hydraulic circuit of the hydraulic cylinder so that the detected quantity of electricity matches the set quantity of electricity. It is characterized by the fact that it is made to do so. This will be described in detail below based on drawings showing examples thereof.

FIG. 1 is a rear view showing one embodiment of the work machine tilting device according to the present invention. The power agricultural machine 1 is connected to and towed a working machine 3, which is a rotary tiller, via a well-known link mechanism 2. This power agricultural machine 1 is equipped with a hydraulic cylinder (lift cylinder) 4 at the rear, which adjusts the inclination of the working machine 3 in the width direction. A stroke sensor 6 is attached to the hydraulic cylinder 4 to detect the amount of extension of the piston rod 5 as an electrical quantity (voltage in this embodiment). FIG. 2 shows how the piston rod 5 of the hydraulic cylinder 4 and the operating rod 7 of the stroke sensor 6 are connected by a connecting rod 8, and FIG. 3 specifically shows the structure of the stroke sensor 6. As shown in FIG. 3, a brush 9 provided at the tip of the operating rod 7 is in sliding contact with a resistance plate having a large number of resistance elements 10 connected in series.

FIG. 4 shows an automatic hydraulic control circuit for a hydraulic cylinder. Two chambers 12 and 13 sandwiching a piston 11 of the hydraulic cylinder 4 are connected to oil passages 15 and 16 via a hydraulic valve 14. . The hydraulic valve 14 is switched by solenoids 17 and 18 to supply hydraulic pressure to either chamber of the hydraulic cylinder 4. Inclination angle setting means 19
can set the inclination angle of the working machine as the same type of electric quantity (voltage) as the stroke sensor, and the output of this inclination angle setting means 19 and the output of the stroke sensor 6 are the same as these two outputs ( voltage) is supplied to a comparison circuit 20 which is a comparison means for comparing the voltages. Comparison circuit 20 compares these two quantities of electricity, sends the result to solenoids 17 and 18, and operates them in a direction where the inclination angle of the working machine becomes a desired angle. As a result, the hydraulic cylinder 4 expands and contracts until the working machine reaches a preset inclination angle. FIG. 5 is a circuit showing an example in which a plurality of sets of inclination angle setting means are arranged in parallel, and three variable resistors 21, 22, 23 and a changeover switch 24 for selecting these are provided. If these three variable resistors 21, 22, and 23 are set to different values and one of them is selected according to changes in working conditions, the inclination of the work equipment can be immediately adjusted to the desired inclination angle. It is extremely convenient because it can be done. FIG. 6 shows a control panel provided on the instrument panel of the driver's seat of the power agricultural machine 1, and this figure shows the inclination angle setting means 1.
Angle adjustment knobs 27, 28, 29 and changeover switches 30, 31, 32 are shown. In the figure, when any switch is pressed, the working machine is tilted to the tilt angle set by the corresponding angle adjustment knob.

The above hydraulic automatic control circuit includes a stroke sensor 6
The amount of extension (stroke) of the piston rod 5 of the hydraulic cylinder 4 is automatically adjusted so that the amount of electricity detected by the inclination angle setting means 19 matches the amount of electricity set by the inclination angle setting means 19. The configurations of the electric circuit and the hydraulic automatic control circuit for matching the detected amount of electricity to the set amount of electricity are not limited to those described above.

Next, in work such as removing ridges, the seventh
As shown in the figure, first, the working machine 3 is tilted to the left by θ relative to the power agricultural machine to perform half the work, and then tilted to the right by θ to perform the remaining half of the work. Therefore, as shown in Fig. 6, the scale of the angle adjustment knob is distributed to the left and right with 0 as the center, and the angle setting means is configured to set both the left and right inclinations. It would be convenient in practice if the configuration was configured so that it could be stored in advance. In addition, since the inclination angle of the working machine varies depending on the working conditions, if a plurality of electric quantity setting devices are provided as inclination angle setting means as in the embodiment, and a plurality of inclinations are set and stored using these, it is possible to The operator can immediately adjust the inclination to the desired angle by simply operating the necessary changeover switch, making the device even more convenient.

As explained above, the work equipment tilting device according to the present invention includes a hydraulic cylinder interposed in the link connecting the work equipment, electrically detects the amount of expansion and contraction of the hydraulic cylinder, and adjusts the inclination angle of the work equipment. Since the hydraulic cylinder is automatically expanded or contracted until the inclination angle becomes equal to the inclination angle preset by the inclination angle setting means, the inclination angle of the working machine can be adjusted very easily and quickly. Ta. Furthermore, multiple sets of inclination angle setting means are provided, which can be selected using a changeover switch, making it possible to immediately respond to changes in working conditions, which is convenient in practice. Summer.

[Brief explanation of drawings]

Fig. 1 is a rear view illustrating the working machine tilting device for power agricultural machinery according to the present invention, Fig. 2 is an explanatory diagram of a hydraulic cylinder and stroke sensor, Fig. 3 is an explanatory diagram of the configuration of the stroke sensor, and Fig. 4 is an illustration of hydraulic pressure. FIG. 5 is an electronic circuit diagram, FIG. 6 is an explanatory diagram of the control panel, and FIG. 7 is an explanatory diagram of the ridge breaking work. 1...Power agricultural machine, 2...Link mechanism, 3...Work machine, 4...Hydraulic cylinder, 5...Piston rod,
6... Stroke sensor, 14... Hydraulic valve,
15, 16... Oil path, 17, 18... Solenoid, 19... Inclination angle setting means, 20... Comparison circuit, 21, 22, 23... Variable resistor.

Claims (1)

[Scope of Claims] 1. A power agricultural machine in which a working machine is connected via a link mechanism so as to be tiltable in the width direction and is towed, and a plurality of inclination angles in which the inclination angle of the working machine can be set as an electric quantity. a setting means, a changeover switch for selecting one of the plurality of inclination angle setting means, a sensor for detecting the amount of extension of the hydraulic cylinder for adjusting the inclination angle of the working machine as an electric quantity, and an electric quantity detected by the sensor. and a comparison means for comparing the amount of electricity set by the inclination angle setting means, and based on the output of the comparison means, the hydraulic circuit of the hydraulic cylinder is adjusted so that the detected amount of electricity matches the set amount of electricity. A work machine tilting device for a powered agricultural machine, characterized in that the work machine tilting device automatically controls the operation. 2. A working machine tilting device for a powered agricultural machine according to claim 1, wherein the tilt angle setting means is configured to be able to set the tilt angle based on the left and right tilts.