JPH0538563Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a depth control device for a rotary tiller or the like mounted on the rear of an agricultural tractor.

(b) Prior art Conventionally, there has been no known technology in which a tractor equipped with an automatic tillage depth control device that automatically controls the tillage depth is provided with means for displaying the set tillage depth and means for displaying the actual tillage depth. It is being done.

For example, there is a technique described in Japanese Utility Model Application Publication No. 58-7507.

In addition, in conjunction with the operation mode changeover switch,
Techniques for changing the displayed content are known, such as those disclosed in Japanese Utility Model Application No. 58-76032 and Japanese Utility Model Publication No. 57-33295.

(c) Problems to be solved by the invention The invention solves the following problems in the depth control device:
If it is manual, what is the current plowing depth?
In addition, in the case of automatic
The configuration is such that it can be quickly determined whether the settings have been set.

During automatic control, there is a need for a device that displays the setting value of a setting device using a setting lever. Even if the actual plowing depth is slightly above or below, it is almost the same as the set value, so the set value equals the actual plowing depth, and there is no need for it to be the actual plowing depth.

On the other hand, when the manual operation is performed, the display device often disappears and remains displayed in conventional devices. However, at this time, operators want to know the current actual plowing depth, which is actually changing.

In this case, the present invention is configured to switch to manual mode and display the plowing depth of the sensor as is.

(d) Means for solving the problem The problems to be solved by this invention are as described above.
Next, means for solving the problem will be explained.

A plowing depth control device equipped with a setting device 22 for setting the plowing depth during automatic control, a sensor 1 for sensing the plowing depth using the rear cover 2, and a position control lever 4 that is operated during manual control. On the control panel 20, there is an automatic/manual switch 21 for switching the tilling depth control between automatic and manual, and one tilling depth display device 2 for displaying the tilling depth value.
3 are placed side by side, and the automatic/manual changeover switch 21 and plowing depth display device 23 are linked, and the set value by the setting device 22 is displayed in the automatic case, and the plowing depth that changes in the sensor 1 is displayed in the manual case. This is configured to be displayed on the plowing depth display device 23 as an alternative.

(e) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a side view of an agricultural tractor in which a rotary tiller is attached to the rear of the tractor to control plowing depth, and FIG. 2 is a control block diagram.

In FIG. 1, a hydraulic case 6 is disposed on the upper surface of a rear axle case 52 of an agricultural tractor, a two-point link frame 55 projects rearward, and a two-point link hitch 56 of a rotary tiller is attached. Further, a lift link 53 is suspended from a lift arm 13 of an agricultural tractor, and the rotary tiller is moved up and down.

Operation lever guide 46 on the side of the hydraulic case 6
, a position control lever 4 and a depth setting lever 5 are provided. On the side of the rotary tillage device, a rear cover 2 which also serves as a tillage depth sensor is pivotally supported on the rear surface of the tillage cover 54. The lower surface of the rear cover 2 and the lower end of the rotation diameter of the tilling claws 17 are detected as the tilling depth by a sensor 1 constituted by a rotary encoder or the like.

The control system will be explained with reference to FIG.

First, the operator selects either one using the automatic/manual changeover switch 21 on the operation panel 20 of the dash board. When operating manually, the depth control bar 40 is protruded and the control motor 9 is moved to adjust the depth so that it does not interfere with the position control. The control bar is retracted.

By rotating the depth setting lever 5, a setting device 22 consisting of a rotary encoder is rotated to set a desired plowing depth. This set plowing depth value and
Detector 1 detects the movement of the sensor that also serves as rear cover 2.
The depth control bar 40 and the spool 15 are detected by comparing the plowing depth with the feedback from the sensor 1 and operating the control motor 9.
The hydraulic valve 12 is moved through the .

10 is a valve position detection switch for checking the position of the hydraulic valve. Reference numeral 8 denotes a gear shift lever, which is configured to automatically raise the working machine when the gear shifts to reverse. 19 is a reverse position detection switch. In addition, when reaching the edge of the field and rotating the work equipment with a large lift, the position control lever 4 is set to the highest position, so the highest position detection switch 18 detects this and interrupts the depth control. The work equipment is raised to its highest position.

The control box 7 receives signals from switches, rotary encoders, etc. of various parts, makes judgments using an internal programmed microcomputer, and issues signals for forward and reverse rotation of the control motor.

The above is the overall depth control system, but in addition to this control device, the present invention has one digital or analog depth control system installed next to the automatic/manual changeover switch 21 on the operation panel 20 of the dash board. A plowing depth display device 23 is provided.

In the embodiment shown in FIG. 2, a digital display indicates that the plowing depth is 26 cm.

(f) Effect of the invention With the above-described configuration, the most important feature of the invention is that the tilling depth value displayed on the tilling depth display device 23 is different depending on whether it is automatic or manual.

That is, in the automatic mode, the value of a setting device consisting of a rotary encoder rotated by the depth setting lever 5 is displayed in real time together with the rotation of the depth setting lever 5, rather than the actual plowing depth.

The actual plowing depth varies up and down to some extent, but the plowing depth remains almost the same, so the set value is sufficient.

Conversely, if the automatic/manual switch 21 is set to manual,
What is displayed on the plowing depth display device 23 is the plowing depth that changes in real time between the lower surface of the rear cover 2 detected by the sensor 1 and the plowing claws 17.
Therefore, if you try to turn around at the edge of the field, the rotary will rotate a lot and the rear cover 2 will droop, so the plowing depth will be displayed as zero.

(g) Effects of the invention Since the invention is constructed as described above, it has the following effects.

Firstly, when the depth setting lever 5 is rotated to set a certain plowing depth value, a display device is required to confirm the set value, but in the present invention, the plowing display device 23 This allows you to check the value.

Second, in the case of manual operation, the tilling depth may change constantly because the control does not converge, but this changing tilling depth value is displayed on the tilling display device 23 in real time.
Therefore, the operator can adjust the tilling depth value to a desired value while operating the position control lever 4 in accordance with the change in tilling depth.

Thirdly, the automatic/manual changeover switch 21 and the plowing depth display device 23 are placed adjacent to each other on the control panel 20, and the control panel 20 is placed on the dash board so that the operator can constantly monitor it. be.

Fourth, there is only one plowing depth display device 23, and either the set value or the actual plowing depth is displayed on the one plowing depth display device 23, so two plowing depth display devices can be used on a narrow dart board. There is no need to arrange a tillage display device.

[Brief explanation of the drawing]

Figure 1 is a side view of an agricultural tractor with a rotary tiller attached to the rear to control tillage depth.
FIG. 2 is also a control block diagram. 1... Sensor, 2... Rear cover, 5... Depth setting lever, 21... Automatic/manual changeover switch, 22... Setting device.

Claims (1)

[Scope of utility model registration request] A plowing depth control device equipped with a setting device 22 for setting the plowing depth during automatic control, a sensor 1 for sensing the plowing depth using the rear cover 2, and a position control lever 4 that is operated during manual control. On the control panel 20, there is an automatic/manual switch 21 for switching the tilling depth control between automatic and manual, and one tilling depth display device 2 for displaying the tilling depth value.
3 are placed side by side, and the automatic/manual changeover switch 21 and plowing depth display device 23 are linked, and the set value by the setting device 22 is displayed in the automatic case, and the plowing depth that changes in the sensor 1 is displayed in the manual case. A tillage depth control device characterized in that it is configured to alternatively display on a tillage display device 23.