JPS581881B2 - Travel control device for powered agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a travel control mechanism for a tilling device such as a tilling rotor that is attached to a working machine such as a rotary so as to be movable left and right, and is used to automatically till uncultivated land one after another. By constantly sliding the sensing plate against the hard boundary wall formed at the boundary between uncultivated land and cultivated land, the movement of this sensing plate is converted into hydraulic pressure, and the tillage device is always able to move the uncultivated land adjacent to the cultivated land. This makes it possible to till the land without leaving any residue.

Conventionally, in such plowing work, the operator of the work equipment constantly watches the boundary between uncultivated land and cultivated land and steers the work equipment in the direction of travel to avoid leaving any uncultivated land. The fatigue of the operating personnel was severe.

Therefore, in order to eliminate such drawbacks, for example, in a combine harvester, the degree of rotation of a rotatable actuating piece that is provided to press against the erected grain culm is detected and converted into an electric signal, and this electric signal is A structure has been proposed in which the combine harvester is configured to provide a moving direction correction mechanism of the combine so that the combine always moves along the erect grain culm while automatically correcting the moving direction.

However, it is extremely difficult in practice to control the direction change of a power agricultural machine such as a combine harvester with large inertia to the left or right in the direction of travel, as proposed in this proposal. There tends to be a large delay between the time when a powered agricultural machine completes a change of direction in response to an electrical signal, and this causes a so-called hunting phenomenon in the control, resulting in a lack of stability in following commands. In order to solve this problem, the control device is extremely complex. Moreover, it had the disadvantage of being expensive.

2 Therefore, the present invention provides a hydraulic device that moves the tilling device to the left and right in the direction of movement of the working machine, so that the tilling device is always in sliding contact with the boundary wall between cultivated land and uncultivated land. A sensing body is provided in the field, and the sensing body and the hydraulic device are configured to interlock with each other so that the end of the tilling device near the cultivated land is aligned with the boundary wall, thereby achieving extremely simple and reliable travel control. It could have been done.

The specific structure will be explained based on the illustrated embodiment. A tilling device 6 such as a tilling rotor installed in a working machine such as a rotary is connected to a piston 8 of a cylinder 7 which can be operated by pressure oil supplied from a hydraulic device 4. By attaching it, the tilling device 6 is formed so as to be movable left and right with respect to the traveling direction of the working machine.

Then, a sensing plate 2 that can advance while slidingly contacting the boundary wall 1 between the cultivated land B and the uncultivated land A is attached to the machine frame 3 of the tillage device 6.
For example, it can be pivoted to. By connecting the rotating upper end of the sensing plate 2 to the spool of the switching valve 5 of the hydraulic system 4 attached to the working machine or the power agricultural machine to which this working machine is connected, via links 11 and 12, For example, when the tillage device 6 comes off the boundary wall 1 and shifts to leave uncultivated land A between it and the adjacent cultivated land B, the sensing plate 2 rotates to move the spool of the switching valve 5, The switching valve 5 is connected to the tank 1 pressurized by the pump 9 so as to return the device 6 to the boundary wall 1 side.
The oil in the cylinder 7 is supplied to the piston 8 in the cylinder 7.

That is, when the tillage device 6 is cultivating without leaving any uncultivated land A between it and the cultivated land B, the spool 5 of the switching valve is activated by the sensor 2 via the links 11 and 12 as shown in FIG. Since the neutral port 5a closes the return oil passage 7a of the cylinder 7 and communicates the oil passage 15a of the relief valve 15 with the tank 10, the pressure oil of the pump 9 returns to the tank 10 via the relief valve 15. Since the pressure oil supplied to the cylinder 7 engages with the spring 17 that is pushing back the piston 8, the piston 8 does not move, so the tilling device 6 is maintained in the same position.

If the tillage device 6 enters the state shown in FIG. 2 in which it is cultivating the cultivated land B again, the spool of the switching valve 5 is turned on via the links 11 and 12 of the sensor 2 that slides on the boundary wall 1. Pressure oil from the pump 9 is pushed to the right in the figure, and the pressure oil from the pump 9 is supplied to the relief valve 15 through the left-hand port 5b through the oil passage 15a.
Since this relief valve 15 closes the oil passage 13 returning from the pump 9 to the tank 10, the pressure oil from the pump 9 is supplied to the cylinder 7 and causes the tillage device 6 to approach the boundary wall 1. If the end of the tilling device 6 near the boundary wall 1 coincides with the boundary wall 1, the spool of the switching valve 5 returns to the neutral position as shown in FIG. 1 described above.

Conversely, if uncultivated land A remains between the tillage device 6 and the boundary wall 1 as shown in FIG.
12 to move the spool of the switching valve 5 to the left in the figure. Return oil path 7a via oil port 5c
communicates with the tank 10, and also communicates the oil passage 15a of the relief valve 15 with the tank 10. The pressure oil in the cylinder 7 returns to the tank 10 and the tiller 6 is moved toward the boundary wall 1 by the spring 17. If the end of the tilling device 6 near the boundary wall 1 matches this boundary wall 1,
The spool of the switching valve 5 is controlled to return to the neutral position shown in FIG.

As described above, the traveling control mechanism of the present invention constantly slides the sensing plate 2 along the boundary wall 1 formed between the cultivated land B and the uncultivated land A, and is linked to the movement of the sensing plate 2. The hydraulic device 4 is used to adjust the movement of only the tilling device 6 to the left or right, and the working machine equipped with this tilling device 6 is configured to simply move straight without considering the bending of the boundary wall 1. All you have to do is drive.

Therefore, this cultivating device 6, which has a small shape and a small inertia due to its light weight, can be adjusted from side to side extremely sensitively and with little delay time using the pressure oil from the switching valve 5 caused by the movement of the sensing plate 2. Since it is movable, one side end of this tilling device 6 can closely follow the boundary wall 1, which prevents the inconvenience of uncultivated land remaining behind the tilling device 6 and the possibility of being tilled again. All of the waste can be eliminated, and there is no need for a complicated mechanism to ensure followability.

Moreover, in this invention, the sensing plate 2 is configured to directly push the spool of the hydraulic device 4 via the links 11 and 12, so the existing hydraulic device 4 in this type of power agricultural machine can be effectively utilized. Therefore, from this point of view as well, the control mechanism of this invention is effective. The structure can be extremely simple and the manufacturing cost can be made low. In addition, since the sensing mechanism including the sensing plate 2 does not use any electrical switches, electrical contacts, or electrical wiring, this sensing mechanism, which slides into contact with the boundary wall 1 and tends to be covered with mud, is sufficiently protected. In addition, since such a sensing mechanism is directly connected to the hydraulic device 4, which is the actuating device,
There is no delay in transmitting signals from the detection mechanism to the actuating device, etc.
The travel control mechanism according to the present invention exhibits excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 is a plan view illustrating a hydraulic interlocking mechanism between a sensing plate and a tilling device according to the invention, and shows a case where the hydraulic interlocking mechanism is in a neutral state. FIG. 2 is a plan view of the state in which the sensing plate 2 is activated and the spool is pushed in, and FIG. 3 is a plan view of the state in which the spool is pulled out. Description of symbols, 1... Boundary wall, 2... Sensing plate, 3... Machine frame, 4... Hydraulic system, 5
......Switching valve, 6...Tilling device, 7...
...Cylinder, 8...Piston, 7a.
...Return oil path, 9...Pump, 10...
...Tank, 11, 12...Link. 13
, 15a... Oil road. 14, 15... Relief valve, 16... Check valve, A.
... Uncultivated land, B... Cultivated land.

Claims (1)

[Claims] 1 A hydraulic device is installed to move the tilling device left and right in the direction of movement of the tilling device, and a sensing body is installed so that it always comes into sliding contact with the boundary wall between cultivated land and uncultivated land that have been tilled by this tilling device. A regular control mechanism for a tilling device in a working machine, characterized in that a sensor and the hydraulic device are configured to interlock with each other so that an end of the tilling device near the cultivated land coincides with the boundary wall.