JPH0448649Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is designed to raise and lower the working equipment until the setting signal from the manually operated position setting device and the detection signal from the machine level detector of the working equipment are balanced. An electric position control means that operates a drive mechanism; and an electric automatic tiller that operates the drive mechanism until a setting signal from a manually operated tilling depth setting device and a detection signal from a tilling depth detector of a working device are balanced. Automatic rolling control that operates a rolling drive mechanism based on the detection result of a horizontal inclination detection sensor for a working device connected to the machine body in a rolling adjustable manner to maintain a constant horizontal and horizontal inclined attitude of the working device relative to the ground. The present invention relates to an automatic control device for an agricultural tractor.

[Conventional technology]

Conventionally, a device having the above-mentioned position control means and automatic plowing depth control means is disclosed in Japanese Patent Application Laid-Open No. 58-216602.
There is a device shown in Japanese Patent Application Laid-Open No. 1983-1998, and a device having the above-mentioned automatic rolling control means is
There is one shown in Publication No. 71311. Agricultural tractors equipped with devices capable of controlling these three types include a switch for selecting either the position control means or the automatic plowing depth control means, a switch for operating the automatic rolling control means, a position setting device, and an automatic plowing depth control means. Four operating tools for the depth setting device are installed in the driving section of the vehicle body.

[Problem that the invention attempts to solve]

However, as described above, the device provided with four operating tools is cumbersome to operate, and the number of parts required for the operating tools is large, making manufacturing time-consuming.

The present invention has been developed in view of the above-mentioned circumstances, and has an object to operate each of the three control means with a simple operation using a small number of operating tools through rational modification.

[Means for solving problems]

The present invention is characterized in that the position setting device is configured to be operable in a floating region on the downward side from the position adjustment region, an automatic plowing depth control selection region is provided within this floating region, and the automatic rolling control means A work selection switch is provided to turn on and off the operation of the switch, and an automatic rolling control on selection area and an automatic rolling control off selection area of this switch are provided with an automatic plowing depth control on position and an off position, respectively. The functions and effects are as follows.

[Effect]

As mentioned above, since the automatic control device is installed, if the work selection switch is set to automatic rolling control on or off and the automatic tilling depth is set to the on position, the position setting device is set to the automatic tilling depth control selection area. By simply operating the machine, automatic plowing depth control under automatic rolling control or automatic plowing depth control becomes possible.

Also, if the work selection switch is set to automatic rolling control on or off as described above, and automatic plowing depth is set to off, even if the position setting device is operated to the automatic plowing depth control selection area, the work equipment will not work. The automatic rolling control state and floating state,
Alternatively, it can be set to a floating state.

Also, no matter what position the work selection switch is set to, the position setting device can be set to the floating area,
When each position adjustment area is operated, the working device is set to a floating state and a position adjustment state, respectively. Incidentally, in this case, it is also possible to set the work selection switch to a floating state, automatic rolling in a position adjustment state, or a non-automatic rolling state.

[Effect of idea]

Therefore, it is a relatively simple modification that doubles the work selection switch as a switch that turns on and off the automatic rolling control means, and with simple operation using a small number of operating tools,
The three control means can now be operated.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 3, there is a hydraulically driven lift cylinder 2 at the rear of the tractor that runs on front wheels (not shown) and rear wheels 1, and a pair of left and right lift arms 3 that are driven up and down by the lift cylinder 2. established,
Further, a rotary tilling device as a working device A is connected to the rear end of the machine body via a three-point link mechanism 4 consisting of a top link 4a and a pair of left and right lower links 4b. The lift arm 3 and the lower link 4b are connected to each other by a lift rod 5a and a lift rod 5b which is extendable and retractable by a hydraulic cylinder 6, so that the working device A can be raised and lowered and the working device A can be rolled. There is.

The agricultural tractor is provided with a driving section B in the center of the body, and this driving section B is provided with a steering handle, a seat 8, a lever-type position setting device 9, and a control box 10.

The agricultural tractor also has a position control that sets the level of the working device A relative to the machine constant, an automatic plowing depth control that maintains the level of the working device A relative to the ground constant, and a constant horizontal and horizontal inclination of the working device A relative to the ground. Equipped with three automatic controls such as automatic rolling control, and a control mechanism that can set the working device A to a so-called floating state, which allows the work device A to be placed in a free vertical position.
This will be explained below.

As shown in FIG. 4, the position setting device 9
is configured so that it can be operated into three operation areas: a position adjustment area X, a floating area Y, and an automatic plowing depth control area Z formed at the end of the floating area Y by its swinging operation.

As shown in FIG. 2, the control box 10 includes a dial-type inclination setting device 11 for setting the ground posture of the working device A during automatic rolling control, and a dial-type inclination setting device 11 for controlling the working device A during automatic plowing depth control. A dial-type sensitivity setter 12 for setting the sensitivity, a dial-type plowing depth setter 13 for setting the ground depth of the working device A during automatic plowing depth control, and a 4-position switch-type work selection switch 14. Four operating tools are provided.

As shown in FIGS. 3 to 5, at the base end of the position setting device 9, there is a potentiometer 9a for detecting its swing angle, and at the lift arm 3, there is a rotating type aircraft level detector 15. The working device A includes a plowing depth detector 16 that detects the plowing depth from the amount of rocking of the rotary cover Ac, a sensor 17 that detects the left and right inclination of the machine at the rear of the machine, and the extendable lift rod 5b has a A stroke sensor 18 for detecting the amount of expansion and contraction is attached to each.

Then, the input is input from the position setting device 9, the machine level detector 15, the plowing depth setting device 13, and the plowing depth detector 16 to the first control device 20 via the relay switch 19, and the output from this control device 20 is A position control system and an automatic plowing depth control system are electrically configured to operate the electromagnetic valve 21 for the lift cylinder 2.

Further, when the position setting device 9 is set to an arbitrary position within the operation area X, the position setting device 9
When the working device A is raised and lowered until the setting signal from the machine and the signal from the machine level detector 15 of the working device A are balanced, and when the position setting device 9 is set within the operation range Y, the working device A It descends to the limit that can be lowered by its own weight, and the vertical position becomes free by following the unevenness of the ground. Also, when the position setting device 9 is set to the operation range Z, the setting signal from the plowing depth setting device 13 is released. The working device A moves up and down until the detection signal from the plowing depth detector 16 of the working device A is balanced.

The device 9 and the solenoid 19a of the relay switch 19 are connected so that the relay switch 19 is actuated by the output of the device 22 that detects the swing angle of the position setting device 9, and similarly, the output of the device 22 is used to operate the relay switch 19. The device 22 and the control device 20 are connected to each other so as to control the operation of the first control device 20 .

A first control device 20 for the electromagnetic valve 21
A further connection is made via a switch 23 that supplies voltage to this connection, and in the event of trouble, the control release switch 24 provided in the control device 20 is turned off and then the switch 23 is operated. The working device A is configured to be able to be forcibly raised and lowered. Further, the control device 20 is configured so that the signal from the sensitivity setting device 12 can be inputted via the relay switch 19 only during automatic tilling depth control, and the signal from the tilling depth detector 16 is inputted during automatic tilling depth control. The responsiveness to the feedback signal can be adjusted.

Signals from the left and right inclination sensor 17, inclination setting device 11, and stroke sensor 18 are input to the second control device 25, and the output of the second control device 25 is used to operate the electromagnetic valve 26 for the hydraulic cylinder 6. The control system is configured.

The work selection switch 14 is a two-barreled four-contact rotary switch, and has an automatic plowing depth control ON position E formed in an automatic rolling control ON selection area C and an automatic rolling OFF selection area D shown in FIG. It can be operated to the off position F.

Then, the switch 1 is set so that each control can be performed by operating the switch 14 in four operating positions.
4 contact point, the second control device 25, and the detection device 22
They are connected to each other. Incidentally, when the switch 14 is operated to the automatic plowing depth control off position F, F, and
Even if the position setting device 9 is set to the automatic plowing depth control region Z, the working device A is not automatically controlled for plowing depth, and maintains a vertical position free state.

The first control device 20 and the electromagnetic valve 2
1 will be referred to as a drive mechanism G for lifting and lowering the working device, and the second control device 25 and the electromagnetic valve 26 will be referred to as a rolling drive mechanism H.

[Another example]

In this embodiment, a lever-type position setting device 9 is used, but a dial-type device may also be used, and the work selection switch 14 may be configured as a slide type.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic control device for an agricultural tractor according to the present invention, in which FIG. 1 is an enlarged plan view of the selection switch, FIG. 2 is a plan view of the control box, FIG. 3 is a perspective view of the rear of the tractor, and FIG. FIG. 4 is a perspective view of the position setting device, and FIG. 5 is an electric circuit diagram of the automatic control device. 9...Position setting device, 13...Plowing depth setting device, 14...Work selection switch, 15...Aircraft level detector, 16...Pilling depth detector, 17...Right and left inclination detection sensor, A... Working equipment, C, D...
Automatic rolling control on area, off area, E, F...
Automatic plowing depth control on range, off range, G...drive mechanism,
H...Rolling drive mechanism.

Claims (1)

[Scope of utility model registration request] Electric position control means that operates the drive mechanism G for lifting and lowering the work equipment until the setting signal from the manually operated position setting device 9 and the detection signal from the aircraft level detector 15 of the work equipment A are balanced; electric automatic tilling depth control means that operates the drive mechanism G until the setting signal from the tilling depth setting device 13 and the detection signal from the tilling depth detector 16 of the working device A are balanced; Automatic rolling control means that operates a rolling drive mechanism H of a working device A connected to the ground based on the detection result of a left-right tilt detection sensor 17 to maintain a constant left-right tilted posture of the working device A with respect to the ground. The automatic control device for a tractor is configured such that the position setting device 9 can be operated to a floating region Y on the downward side from a position adjustment region X, and an automatic plowing depth control selection region Z is provided within this floating region Y. A work selection switch 14 is provided for turning on and off the operation of the automatic rolling control means, and an automatic rolling control ON selection area C and an automatic rolling control OFF selection area D of this switch 14 are respectively set to perform automatic plowing. An automatic control device for an agricultural tractor provided with a deep control on position E and an off position F.