JPH0639529Y2 - Working depth detector for ground work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a working depth detecting device for a ground work vehicle such as an agricultural tractor.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of ground work vehicle, when this is an agricultural tractor equipped with a rotary cultivating working unit which is a ground work machine, its plowing depth is It is designed to detect the swing angle of the rear cover. When performing such ground work, if you try to detect the working depth of shallow work and deep work with the rear cover that swings on the spindle at the same position, even if the rear cover swings at the same angle, the actual There is a large deviation in the working depth change, and recently there is a thing that allows the rocking support shaft of the rear cover to be adjusted stepwise according to deep and shallow ground work, but in this case, the rear cover The working relationship between the work depth detection sensor and the work depth detection sensor deviates at each adjustment, and the work depth cannot be detected with high accuracy. Therefore, conventionally, the actual condition is to adjust the connection relationship between the rear cover and the working depth detection sensor in accordance with the stepwise adjustment of the rear cover, and this adjustment requires careful fine adjustment, etc. However, it has a drawback that it is extremely troublesome and requires a high level of technology, resulting in extremely poor workability.

[Means for Solving the Problem] The present invention has been made in view of the above circumstances and was devised with the object of providing a working depth detection device for a ground work vehicle capable of eliminating these drawbacks. ,
The work depth detection sensor is linked to the rear cover provided on the ground work unit so that the work depth can be adjusted stepwise so as to correspond to shallow ground work, and the work depth is detected based on the swing angle of the rear cover. In the agricultural tractor configured as described above, when the working depth detection sensor is connected to the rear cover, the detection value when the ground working part is lifted from the field scene and the rear cover is in a natural drooping state has the above-described stepwise shallow value. In the depth adjustment state, different values are set and connected, and the control unit that inputs the detection value from the working depth detection sensor and issues the necessary plowing depth automatic control command has the rear cover natural It is characterized in that a rear cover set judging means is provided for judging in which state the rear cover is set based on the detection value in the hanging state.

With this configuration, the present invention adopts a rear cover that can be adjusted stepwise in response to deep and shallow work, but at the time of the adjustment, the connection relationship between the rear cover and the working depth detection sensor is changed. It is designed so that no adjustment is necessary.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, and a rotary tiller 3 is attached to a rear portion of the traveling machine body 1 via a lifting link mechanism 2 so as to be vertically movable.

A front end edge of an intermediate cover 5 is swingably supported via a support shaft 6 at a rear portion of an upper cover 4 integrated with the tillage frame of the tillage section 3, and a rear end edge of the intermediate cover 5 is also supported. A front end edge of a rear cover 7 is pivotally supported by a support shaft 8 so as to be swingable. Reference numeral 9 denotes a bracket integrally provided on the upper cover 4 side. An adjusting rod 10 is movably penetrated through a tip portion of the bracket 9 and is positioned at two upper and lower positions by inserting / removing the stop rod 10a. A lower end portion of the adjusting rod 10 is pivotally connected to a rear end portion of the intermediate cover 5 so as to be held. And the rear cover 7 is an adjustment rod.
When 10 is held in the upper position as shown in FIG. 3, the swing support shaft 8 is set to the upper position and set in the deep plowing posture, and when held in the lower position as shown in FIG. Support shaft 8
Is set to the lower position and is set in a shallow plowing posture.

Reference numeral 11 denotes a tilling depth detecting sensor provided integrally with the bracket 9 and having a sensor arm 11a of the tilling depth detecting sensor 11.
Is linked via a link 12 to a bracket 7a protruding from the rear cover 7. Further, as will be described later, the swing angle of the rear cover 7 with the support shaft 8 as a fulcrum is detected by the tilling depth detecting sensor 11. In this case, the rear cover 7 in the shallow plowing set posture is used. The swing range of the sensor arm 11a corresponding to the swing range A to B from the drooping posture in the natural state (that is, the posture in which the rear cover 7 is not in contact with the ground) to the upper limit is A to B , but the deep plowing set In the posture, since the support shaft 8 is on the lower side, the swing range of the sensor arm 11a corresponding to the swing range C to D from the drooping posture to the upper limit in the natural state is C to D , and particularly in the drooping posture in the natural state. The detection value of sensor arm 11a is set to be different from A and C.

The detection value of the tilling depth detection sensor 11 is input to a control unit 12 configured by using a microcomputer, and the control unit 12 must further detect the swing angle of the lift arm 13. A signal from a sensor such as a working portion height detection sensor 14 for detecting the working portion height or a switch such as a switching switch 16 for switching whether or not to perform automatic working depth control is input. . And the control unit 12
Will issue the necessary control commands to the corresponding actuators based on these input signals. As described above, the control when the rear cover 7 is switched to the deep plowing set posture or the shallow plowing set posture is a flow chart. Will be explained. That is, after the system is started and the data is read, it is detected by the working unit height detection sensor 14 that the plowing part 3 is lifted and lifted from the field scene, that is, whether the rear cover 7 is in the natural hanging posture. (This judgment may be made by setting the cultivating part 3 to the upper limit position, or by making it higher than a preset height. ). If YES is determined because the rear cover 7 is in the natural hanging posture state, it is determined whether or not the detection value of the working depth detection sensor 11 is A , and YES is determined as A. When the rear cover 7 is set, the rear cover 7 is set to the shallow plowing posture, and the plowing depth control is performed based on this. On the other hand, when NO is determined as not A , that is, the detected value is C. In case of rear cover 7
Is set to the deep plowing posture, the plowing depth control based on this is performed, and when the rear cover 7 is switched to the shallow plowing and deep plowing states in this way, the rear cover set for discriminating these is set. Judgment means is configured, and tilling depth control corresponding to this judgment is automatically performed.

By the way, it may be possible to further judge whether or not the detection value is C after the judgment of NO assuming that it is not A. However, when the judgment of NO is made here, it is an abnormal state. Can be set to issue an alarm.

In the embodiment of the present invention configured as described above, whether the automatic plowing depth control is performed in the shallow tilling state or the deep plowing state is performed as described above depends on the swing support shaft 8 of the rear cover 7. It suffices to adjust the position of the plow in a stepwise manner. When this stepwise switching adjustment is carried out, the plowing part 3 is lifted and the rear cover 7 is in the natural drooping position as described above. The detection values of 11 are set to be different from A and C , and the control unit 12 compares and determines the different detection values to determine whether the rear cover 7 is currently in a shallow plowing set state or a deep plowing set state. Control is performed, and the working depth control is performed based on the corresponding set state.

As described above, in the present invention, even if the rear cover 7 is adjusted stepwise according to the desired tilling depth, either the shallow tillage set state or the deep tillage set state, the controller 12 does not change which state. It is possible to determine whether or not the setting has been made and to carry out automatic control of the working depth corresponding to it. As a result, it is not necessary to adjust the connection relationship between the rear cover 7 and the tilling depth detecting sensor 11 every time the set state of the rear cover 7 is adjusted as in the conventional case, so that the workability is remarkably improved and the accuracy is high. Plow depth can be detected.

Further, in this structure, when the rear cover 7 is adjusted in steps, the swing detection range of the working depth detection sensor 11 becomes A.
~ B , C ~ D , but in any case, based on the comparison judgment of the rear cover state of the control unit 12, the display of the working depth meter 18 provided on the operation panel 17 is full within the detection range in any case. It would also be programmable to display strokes.

[Effects] In summary, since the present invention is configured as described above, the rear cover is adjusted stepwise according to the working depth, but in that case, the rear cover naturally hangs down. The detection value in the state that has reached the state is different,
By comparing and judging this, the control section can judge which state the rear cover is set to. Therefore, the control section may perform the corresponding working depth control based on the result of this determination, and every time the rear cover is adjusted as in the conventional case, the connection relationship between the rear cover and the working depth detecting sensor is determined. Therefore, the workability can be remarkably improved and the work depth can be controlled with high accuracy.

[Brief description of drawings]

The drawings show an embodiment of a working depth detecting device for a ground work vehicle according to the present invention. Fig. 1 is a side view of an agricultural tractor, and Fig. 2 is a cultivating part showing a shallow plowing set state. FIG. 3 is a schematic side view, FIG. 3 is a schematic side view of a tilling part showing a deep plowing set state, FIG. 4 is a plan view of a main part of the tilling part, FIG. A block circuit diagram of the system, FIG. 7 is a flow chart diagram of the same, and FIG. 8 is a front view of an operation panel. In the figure, 1 is a traveling body, 3 is a cultivated part, 5 is a rear cover, 8
Is a spindle, 11 is a plowing depth detection sensor, and 12 is a control unit.

Claims (1)

[Scope of utility model registration request] 1. A work depth detection sensor is interlocked with a rear cover provided in a ground work section so that stepwise adjustment can be performed to cope with shallow depth work, and the work depth is detected based on the swing angle of the rear cover. In the agricultural tractor configured to perform height detection, when the working depth detection sensor is connected to the rear cover, the detection value when the ground working unit is lifted from the field scene and the rear cover is in a natural hanging state is In the stepwise shallow depth adjustment state, set and connect so that they will have different values, respectively, and input the detection value from the work depth detection sensor to the control unit that issues the necessary work depth control command. A ground cover set judging means is provided for judging in which state the rear cover is set based on a detected value of the rear cover in a natural hanging state. Work in the business car depth sensing device.