JPS6231335Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is configured so that the left and right traveling devices are independently moved up and down relative to the aircraft body by hydraulic cylinders, and the ground clearance of the aircraft and the left and right tilted posture of the aircraft are adjusted. This invention relates to a mobile agricultural machine that improves its running performance in wet fields.

In the above-mentioned mobile agricultural machine, a pair of control valves that govern the operation of the left and right hydraulic cylinders are selectively operated, and the left and right traveling devices are operated up and down simultaneously in the same direction or independently up and down, thereby adjusting the ground height of the machine and the left and right inclination. Adjusting your posture. In this case, there is no major problem in adjusting the height of the aircraft even if there is a slight operational error, but adjusting the aircraft horizontally requires careful and accurate operation, which is quite difficult for inexperienced operators. It was hot. Furthermore, if the left and right tilt adjustment operation is incorrectly performed, there is a risk of the vehicle falling sideways, so even more caution is required.

The present invention was developed with a focus on these points, and the overall operation of raising and lowering the aircraft is performed by manual selection, while the left and right tilt adjustment of the aircraft is automated, resulting in a highly safe aircraft. The purpose is to enable posture adjustment.

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

FIG. 1 shows a combine harvester as an example of a mobile agricultural machine, which is equipped with a threshing device 1 and a pair of left and right crawler-type traveling devices 4 at the bottom of a machine body 3 to which a reaping pre-processing section 2 is connected. There is.

The track frame 5 of each of the traveling devices 4 is supported so as to be movable up and down relative to the body 3 via front and rear links 6, 6, and is driven up and down by a single-acting hydraulic cylinder 7. It's getting old.

FIG. 8 shows a hydraulic operation circuit for the left and right hydraulic cylinders 7, 7 for raising and lowering the truck frame, and the hydraulic cylinders 7, 7 are connected in parallel to the output side oil passage a of a manually operated three-position switching valve 8. By switching the switching valve 8 between forward and reverse directions, both hydraulic cylinders 7, 7 can be operated synchronously in the same direction. Further, on the downstream side of the switching valve 8, the oil passage a
and the hydraulic cylinders 7, 7 are connected in communication;
A two-position switching valve 9 is provided which can be manually switched to a state where the communication is cut off and the oil passage a is connected to another oil passage b. The oil passage b is connected to a pump port of a three-position switching type electromagnetic control valve 10.

This control valve 10 is connected to the two hydraulic cylinders 7, 7 so as to operate the two hydraulic cylinders 7, 7 in the normal or reverse direction at the forward/reverse switching position, and is connected to an electric control valve attached to the fuselage 3. It is connected to an electric control circuit 12 so that its operation is controlled based on the detection result of the left and right tilt sensor 11.

According to the above configuration, when the 2-position switching valve 9 is switched to the first position A as shown in the figure, the left and right traveling devices 4, 4 are moved relative to the aircraft body 3 by switching the 3-position switching valve 8 between forward and reverse directions. They can be driven up and down synchronously in the same direction, thereby allowing the body 3 to move up and down in parallel to adjust the height above the ground.

When the 2-position switching valve 9 is switched to the second position B, and the 3-position switching valve 8 is switched to and held at the aircraft raised position (the position where pressure oil is supplied to the oil passage a), the pressure oil from the pump P is The air is supplied to the control valve 10, and therefore, the control valve 10 is switched based on the detection result of the sensor 11, and the aircraft body 3 is maintained in a horizontal horizontal attitude.

In this case, if the left and right hydraulic cylinders 7, 7 have not reached the stroke end, both hydraulic cylinders 7, 7 operate in opposite directions to perform horizontal correction, but when both hydraulic cylinders 7, 7 are at the stroke end, one side Horizontal control is performed only by the hydraulic cylinder. For example, when both hydraulic cylinders 7, 7 are at the end of extension, that is, when the aircraft body 3 is at its highest, and the aircraft body 3 descends to the right by more than a certain level,
By shortening the left hydraulic cylinder 7, left downward control is performed.

In the embodiment, the three-position switching valve 8 for moving the left and right traveling devices 4, 4 up and down synchronously in the same direction and the two-position switching valve 9 for switching the drive mode are manually operated, but these are operated by electromagnetic Constructed into a switching valve,
It is also possible to change over these valves by operating a switch.

As explained in the embodiments above, according to the present invention, the height of the entire aircraft can be adjusted arbitrarily by manual operation, and only the left and right horizontal adjustment of the aircraft, which may cause a fall accident due to erroneous operation, is automated. This made it possible to adjust the height and left/right tilt of the aircraft with high overall safety and ease of handling.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the mobile agricultural machine according to the present invention, and FIG. 1 is an overall side view of the combine harvester, FIG. 2 is a rear view of the combine harvester, and FIG. 3 is a hydraulic circuit diagram for vertically driving the traveling device. . 3... Airframe, 4... Travel device, 7... Hydraulic cylinder, 8... 3 position switching valve, 9... 2 position switching valve, 10... Control valve, 11... Inclination sensor.

Claims (1)

[Scope of utility model registration request] The left and right traveling devices 4, 4 are connected to hydraulic cylinders 7, 4, respectively.
The mobile agricultural machine is configured to move up and down independently relative to the machine body by means of hydraulic cylinders 7, and the hydraulic cylinders 7, 7 are connected in parallel to a 3-position switching valve 8 that is manually operated so as to move in the same direction. The hydraulic cylinders 7, 7 are configured to be driven synchronously, and the hydraulic cylinders 7, 7 are also connected to a three-position switching type control valve 10 that operates based on the detection result of a left/right tilt sensor 11 attached to the fuselage 3. a state in which both hydraulic cylinders 7, 7 are configured to be automatically controlled to maintain the left and right horizontal positions, and the operation of both hydraulic cylinders 7, 7 is controlled only by manual operation of the 3-position switching valve 8;
A mobile agricultural machine characterized by being provided with a two-position switching valve 9 for switching the hydraulic path between a state and a state automatically controlled only by the control valve 10.