JP3741904B2 - Plowing control device for tillage work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tilling depth control device for a tilling work machine such as a rotary work machine connected to a work vehicle such as a tractor.
[0002]
[Prior art]
Conventionally, when a tilling work machine is attached to a work vehicle such as a tractor and the field work is carried out by the tilling work machine, the raising / lowering of the tilling work machine is automatically adjusted between the work vehicle and the tilling work machine to keep the tilling depth constant. As a plowing depth control device that performs this plowing automatic control, a plowing working unit and a working vehicle are provided with a plowing depth setting device and a plowing depth sensor. An apparatus is known in which a working device is provided with a control device 7 for raising and lowering a tilling work machine based on a setting value of the setting device and a detection value of a tilling depth sensor.
[0003]
[Problems to be solved by the invention]
On the other hand, the plowing depth sensor is provided with a coupler or the like in the middle of the wiring cable. By connecting and disconnecting the coupler, the plowing depth sensor can be arbitrarily connected and disconnected, and the work vehicle and the plowing machine can be attached and detached. It is configured so that the work vehicle and the tilling work machine can be separated from each other without being obstructed by the wiring of the tilling depth sensor at the time of work.In other words, the coupler is attached and detached during maintenance and assembly, etc. Is done.
[0004]
For this reason, when a non-plowing depth sensor (coupler) is connected, the tillage working machine is moved up and down based on the detected value of the tilling depth sensor and the set value of the tilling depth setting device. There is a drawback that it may operate unexpectedly. In addition, in order to solve the above-described drawbacks, there are some equipped with detection means for detecting whether or not the plowing depth sensor is once disconnected and then connected again. In this case, the control including the detection means becomes complicated. In addition to the above-described drawbacks, there is a disadvantage that the detection means may malfunction when the coupler is poorly connected or when the wiring of the tilling depth sensor is disconnected.
[0005]
[Means for Solving the Problems]
A plowing depth control device for a tilling work machine according to the present invention for solving the above-described problem includes a plowing depth setting device 9 and a plowing depth sensor 11, and based on a set value of the setting device 9 and a detection value of the sensor 11. in working vehicle provided with a control device 7 which tilling machine 3 is moved up and down the to tilling depth control, the control device 7 side, if the connection between the tilling depth sensor 11 and the control unit 7 side of the disconnect state In the state where the plowing depth control is prohibited and the ignition is continued , the plowing depth control is performed when the plowing depth sensor 11 is switched from the disconnected state to the connected state. Means for continuing the prohibition of the soil , and when both the above means are used to turn off the ignition once after the tilling depth control prohibiting state and then enter , the tilling depth sensor 11 and the control device 7 side are in a connected state. If only, Kofuka controllable state It is characterized by being configured to control means for controlling.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a tractor provided with a tilling depth control device of the present invention. A tilling work machine (rotary work machine) 3 provided with a rotary 2 for tilling is provided behind a tractor 1 serving as a work vehicle. It is detachably connected via the hitch mechanism 4. At this time, an elevating mechanism 6 for elevating and lowering the hitch mechanism 4 is provided on the tractor 1 side, that is, the rotary work machine 3 is connected to the tractor 1 so as to be movable up and down.
[0007]
On the other hand, the elevating mechanism 6 is provided with a control device 7 shown in FIG. 2 for controlling the operation of the elevating mechanism 6, and the control device 7 operates the elevating mechanism 6 (elevating and lowering the rotary working machine 3). Although it is configured to be able to automatically control, the control device 7 is configured to be able to perform the tilling depth automatic control that keeps the tilling depth constant by controlling the lifting and lowering of the rotary work machine 3. The plowing depth by the rotary working machine 3 can be automatically made constant by the plowing depth automatic control.
[0008]
That is, on the control device 7 side, the tilling depth automatic SW 8 for operating ON / OFF of the tilling depth automatic control, the tilling depth setting device 9 for setting the tilling amount in the tilling depth automatic control, and the tilling state at the time of tilling ( A tilling depth sensor 11 for detecting the tilling depth) is connected, and when the tilling depth automatic SW 8 is turned on, the above tilling depth automatic control is activated. Based on the value of the sensor 11, the rotary work machine 3 is automatically raised and lowered to keep the tilling depth constant (the tilling depth determined by operating the tilling depth setting device 9).
[0009]
The elevating mechanism 6 includes a hydraulic cylinder 12, a lift arm 15 that is swung up and down by the hydraulic cylinder 12, solenoid valves 13 and 14 for the hydraulic cylinder 12, and the like. The lift arm 15 is swung up and down via the cylinder 12 and the hitch mechanism 4 is moved up and down.
[0010]
At this time, two solenoid valves 13 and 14 are provided for expanding and contracting the hydraulic cylinder 12, that is, for raising and lowering the hitch mechanism 4, and the control device 7 controls the two solenoid valves (the solenoid valve 13 for lifting the lift arm). The lowering solenoid valve 14) is instructed to actuate, thereby controlling the elevation of the hitch mechanism 4, that is, the rotary working machine 3.
[0011]
Further, in the present embodiment, the tilling depth setting device 9 is composed of a variable resistance (volume), and the tilling depth sensor 11 detects the movement of the rear cover 3a that is in sliding contact with the soil surface of the rotary work machine 3 with a potentiometer or the like. What is configured to do so is used, and by measuring the swing angle of the rear cover 3a that swings according to the tilling depth with a potentiometer, the tilling depth during work is measured. ing.
[0012]
On the other hand, as described above, the control device 7 includes the lifting arm lifting solenoid valve 13 and the lowering solenoid valve 14 on the output side, the tilling sensor 11, the tilling depth setting device (cultivation depth setting volume) 9, A depth automatic SW 8 is connected to each input side, and when the tilling depth automatic SW 8 is ON as described above, the control device 7 sets the value of the tilling depth sensor 11 and the value of the tilling depth setting device 9. An automatic tilling depth control mechanism (function) that controls the operation of both valves 13 and 14 based on the difference, sets and adjusts the height of the rotary working machine 3 and maintains a predetermined tilling amount is provided in software or hardware. Is provided.
[0013]
The control device 7 and the tilling depth sensor 11 are connected via a detachable coupler 16, and the wiring between the tilling depth sensor 11 and the control device 7 can be connected and disconnected by attaching and detaching the coupler 16. It has become. Further, the control device 7 is provided with a terminal S1 to which an ON / OFF signal is input when the coupler 16 is attached and detached, and a terminal S2 to which an ON / OFF signal is input when the tilling depth automatic SW 8 is turned ON / OFF. The control device 7 can detect ON / OFF of the tilling depth automatic SW 8 and the attachment / detachment of the coupler 16 (connection / disconnection of the tilling depth sensor 11 and the control device 7) by the signals of the terminals S1 and S2. It has become.
[0014]
On the other hand, in addition to the automatic tilling depth control mechanism, the control device 7 is provided with a check mechanism for restricting the operation of the automatic tilling depth control mechanism (switching between operation and deactivation) in terms of software or hardware. As will be described later, the mechanism is configured to be able to control the ON / OFF of the tilling depth automatic control regardless of whether the tilling depth automatic SW8 is ON / OFF. Next, the operation flow of the check mechanism will be described in detail.
[0015]
As shown in FIG. 3, the check mechanism first checks whether the ignition key (IG) is ON (ON state) or OFF (OFF state) in steps S1 and S2. At this time, first, in step S1, the previous ignition key is checked to check whether the ignition key is ON or OFF. Only in the case of OFF, the ignition key is checked again in step S2. If the ignition key is ON, the process proceeds to step S3 to check whether the coupler 16 is connected.
[0016]
If the coupler 16 is connected, the coupler connection flag is set in step S41. If the coupler 16 is not connected, the coupler connection flag is reset in step S42, and then the coupler flag is checked in step S5. I do. If the ignition is ON in step S1 and if it is OFF in step S2, the coupler flag is directly checked in step S5.
[0017]
Thereafter, in the coupler flag check in step S5, if the coupler connection flag is set, it is checked again in step S6 whether or not the coupler 16 is connected. If the coupler 16 is not connected, the coupler connection flag is reset in step S7, and the tilling depth automatic control mechanism (plowing depth automatic control) is turned OFF in step S81. If the coupler connection flag is reset in the coupler flag check in step S5, the process directly proceeds to step S81 to turn off the tilling depth automatic control mechanism.
[0018]
On the other hand, if the coupler 16 is connected in step S6, the process proceeds to step S82 and the automatic tilling mechanism (plowing depth automatic control) is turned on. Then, after the operation in step S81 and step S82 is completed, the process returns to repeat the above flow.
[0019]
When the check mechanism removes the coupler 16 in, for example, assembly or inspection work by the operation of the above flow and separates the rotary work machine 3 and the tractor 1, it is checked that the coupler 16 has been removed in step S3 or step S6. Then, the coupler connection flag is reset. For this reason, while working with the coupler 16 removed, the tilling depth automatic control continues to be turned off. However, when the ignition key remains on even when the coupler 16 is connected at the end of assembly or inspection work. Therefore, the process does not go through step S41, and therefore the coupler connection flag is not set, and the tilling automatic control is kept in the OFF state.
[0020]
However, once the ignition key is turned off and then turned on, if the coupler 16 is connected, the coupler connection flag is set. If the coupler connection and the ignition key are turned on from this state, the tilling depth automatic control is performed. Becomes ON and automatic tilling depth control is performed. That is, once the coupler 16 is removed while the ignition key is ON, the tilling depth automatic control is not turned ON until after the ignition key is once turned OFF.
[0021]
That is, when the check mechanism is switched from the disconnected state (the state where the coupler 16 is removed) to the connected state (the state where the coupler 16 is connected), the tilling depth is changed. In addition to having a means for prohibiting automatic control, it has a control means for controlling to a state where plowing depth control is possible when the ignition is once turned off (cutting operation) and then turned on (entering operation) after the prohibition state of plowing depth automatic control. It has a structure.
[0022]
For this reason, when the coupler 16 is once removed in assembly or inspection work, and then the coupler 16 is connected again, the rotary work machine 3 is prevented from being lifted up and down by a sudden operation, and the rotary work machine that an operator does not expect. 3 is prevented. At this time, since the check mechanism has the above-described operation configuration, there is no need to include a means (switching check means) or the like for checking whether or not the plowing depth sensor 11 has been switched from the non-mounted state to the mounted state, Switching of the operation of the tilling depth control can be relatively easily configured by the control device 7 (check mechanism).
[0023]
In the above switching check means, the switching check means may malfunction due to poor connection of the coupler 16 or disconnection of the wiring (because the switching check means checks the connection state of the tillage sensor). In this case, since the control of the tilling automatic control is performed based on the ON / OFF of the ignition, the malfunction (incorrect raising / lowering) of the rotary working machine 3 based on the malfunction of the switching check means is prevented, and the automatic tilling depth control is performed. Switching can be performed more reliably.
[0024]
【The invention's effect】
According to the structure of the present invention configured as described above, when the connection between the tillage depth sensor and the control device is once cut off during assembly, inspection work, etc., when the connection is made thereafter, the tilling work machine is raised and lowered by a sudden operation. The control means checks whether the tillage sensor has been switched from the disconnected state to the connected state as in the past. There is no need to provide a means for performing the operation, and there is an advantage that the switching means for the operation of the tilling depth control can be configured relatively easily by the control means.
[0025]
In addition, since the control means controls switching of the tilling depth control based on the ON / OFF of the ignition, the malfunction of the controlling means due to poor connection between the tilling depth sensor and the control device side or disconnection of the wiring is prevented. There is also an effect that the malfunction of the work machine (false lifting) is prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor.
FIG. 2 is a block diagram of a tilling depth control device.
FIG. 3 is an operation flowchart of the check mechanism.
[Explanation of symbols]
3 Rotary work machine (cultivation work machine)
7 Control device 9 Working depth setting device 11 Working depth sensor

Claims (1)

A plowing depth setting device (9) and a plowing depth sensor (11) are provided, and the plowing work implement (3) is moved up and down based on the setting value of the setting device (9) and the detection value of the sensor (11). in working vehicle provided with a control device (7) for controlling the plowing when the control device (7) side, connected with the tilling depth sensor (11) and the control unit (7) side of the disconnect state In the means for prohibiting the depth control and the ignition continuing state, the plowing sensor (11) and the control device (7) side are all switched from the disconnected state to the connected state. Means for continuing the prohibition of the depth control, and when both the above means are used to turn off the ignition once after the tilling depth control prohibited state, and when the entering operation is performed , the tilling depth sensor (11) and the control device (7) side only when bets are in the connected state, controls the Kofuka controllable state Tilling depth control device for tilling machine, characterized in that to constitute a control means.

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