JP2000342012A - Device for controlling tilling depth in tillage operation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for controlling a tilling depth in a tillage operation machine not carrying out the lifting or lowering contrary to the expectation of an operator. SOLUTION: This device for controlling a tilling depth by lifting and lowering a tillage operation machine 3 based on the values of a tillage depth-setter 9 and a tillage depth sensor 11 has a means for prohibiting the tillage depth control when the connection of the tillage depth sensor 11 with a controlling device 7 side is switched from an off-state to an on-state, and a means for controlling the depth controller into a state capable of controlling the tillage depth when the ignition is once switched off and switched on again after the prohibiting state of the tillage depth control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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]

2. Description of the Related Art Conventionally, when a tilling work machine is attached to a work vehicle such as a tractor and the tilling work machine is used for tilling a field, the lifting and lowering of the tilling work machine is automatically adjusted between the work vehicle and the tilling work machine. Some of the machines have a function of automatic plowing depth control to keep the amount of plowing constant. There is known a sensor provided with a sensor and a control device 7 for raising and lowering the tilling implement based on the setting value of the setting device and the detection value of the tillage depth sensor on the work vehicle side.

[0003]

On the other hand, the tillage depth sensor is provided with a coupler or the like in the middle of the wiring cable. By attaching and detaching the coupler, the wiring of the tillage depth sensor can be arbitrarily connected and disconnected. It is configured so that the work vehicle and the tilling work machine can be separated without being hindered by the wiring of the tillage depth sensor when attaching and detaching the work vehicle and the tilling work machine. Work is performed, and connection and disconnection of wiring are performed.

For this reason, when the tillage depth sensor (coupler) in the non-mounted state is connected, the tillage implement is moved up and down based on the detection value of the tillage depth sensor and the set value of the tillage depth setting device, and the tillage work is performed. There is a disadvantage that the machine may behave unexpectedly by the operator. Also, to solve the above-mentioned drawbacks, after the tillage depth sensor is once disconnected, there is also provided with a detection means for detecting whether or not the connection has been made again,
In this case, in addition to the drawback that the control including the detection means becomes complicated, there is also a drawback that the detection means may malfunction when the connection of the coupler is poor or the wiring of the tillage sensor is broken.

[0005]

To solve the above-mentioned problems, a tilling depth control device for a tilling machine according to the present invention comprises:
And a cultivation depth sensor 11, a work vehicle provided with a control device 7 for raising and lowering the tilling work machine 3 based on the setting value of the setting device 9 and the detection value of the sensor 11 and controlling the cultivation depth, the control device On the 7th side, means for inhibiting the tillage depth control when the connection between the tillage depth sensor 11 and the control device 7 side is switched from the disconnected state to the connected state is provided, and the ignition is performed after the tillage depth control inhibition state. It is characterized in that control means is provided for controlling the plowing depth to be in a state where the plowing depth can be controlled when the cutting operation is performed once and the entering operation is performed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a tractor provided with a tillage depth control device according to the present invention, and shows a tractor 1 as a working vehicle.
A tilling machine (rotary machine) 3 provided with a cultivating rotary 2 is detachably connected via a hitch mechanism 4 to the rear of the machine. At this time, a hitch mechanism 4 is provided on the tractor 1 side.
The rotary working machine 3 is connected to the tractor 1 so as to be able to move up and down.

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 operation of the elevating mechanism 6 (the operation of the rotary work machine 3) is controlled by the control device 7. Although the controller 7 is configured to be able to perform automatic control of the plowing depth, the control device 7 can perform the plowing depth automatic control that keeps the plowing depth constant by controlling the lifting and lowering of the rotary work machine 3. The plowing depth by the rotary work machine 3 can be automatically made constant by the plowing depth automatic control.

That is, the control device 7 has an automatic cultivation depth switch SW8 for turning on and off the automatic cultivation depth control, a cultivation depth setting device 9 for setting an amount of cultivation depth in the automatic cultivation depth control, A tillage depth sensor 11 and the like for detecting a deep state (amount of tillage) are connected, and by turning on a tillage depth automatic SW8,
The automatic plowing depth control is activated, and the rotary work machine 3 is automatically raised and lowered based on the value of the plowing depth setting device 9 and the value of the plowing depth sensor 11 as in the conventional case, and the plowing depth is constant (the plowing depth setting device). 9).

The lifting mechanism 6 includes a hydraulic cylinder 12,
The hydraulic cylinder 12 includes a lift arm 15 which is vertically swung by the hydraulic cylinder 12, solenoid valves 13 and 14 for the hydraulic cylinder 12, and the like.
The operation of 4 causes the lift arm 15 to swing up and down via the hydraulic cylinder 12 to move the hitch mechanism 4 up and down.

At this time, the solenoid valves 13, 14
Are provided for extending and retracting the hydraulic cylinder 12, that is, for raising and lowering the hitch mechanism 4.
By issuing an operation instruction to the two solenoid valves (the solenoid valve 13 for lifting the lift arm and the solenoid valve 14 for lowering the lift arm), the lift of the hitch mechanism 4, that is, the rotary working machine 3, is controlled.

In this embodiment, the cultivation depth setting device 9 is constituted by a variable resistance (volume), and the cultivation depth sensor 11 controls the movement of the rear cover 3a in sliding contact with the cultivated soil surface of the rotary working machine 3 by using a potentiometer. And the like is used to detect the amount of plowing during work by measuring the swing angle of the rear cover 3a that swings according to the amount of tillage with a potentiometer. It has a structure.

On the other hand, as described above, the control device 7 has the solenoid valve 13 for raising the lift arm and the solenoid valve 14 for lowering the output side, the cultivation depth sensor 11, the cultivation depth setter (the cultivation depth setting volume). 9, an automatic cultivation depth SW 8 is connected to the input side. When the automatic cultivation depth SW 8 is ON as described above, the control device 7 controls the value of the cultivation depth sensor 11 and the value of the cultivation depth setting device 9. The two valves 1
An automatic cultivation depth control mechanism (function) for controlling the height of the rotary working machine 3 by controlling the operation of the rotary working machines 3 and 14 and maintaining a predetermined cultivation depth is provided as software or hardware.

The controller 7 and the tillage depth sensor 11 are connected via a detachable coupler 16.
The connection of the wiring between the tillage depth sensor 11 and the control device 7 can be performed by attaching and detaching. The control device 7 is provided with a terminal S1 to which ON and OFF signals are input when the coupler 16 is attached and detached, and a terminal S2 to which ON and OFF signals are input when the automatic tillage depth SW 8 is turned ON and OFF. The control device 7 has a structure capable of detecting ON / OFF of the automatic tillage depth SW 8 and attachment / detachment of the coupler 16 (connection / disconnection of the wiring between the tillage depth sensor 11 and the control device 7) by the signals of the terminals S1 and S2. Has become.

On the other hand, in addition to the above-mentioned automatic plowing depth control mechanism, the control device 7 is provided with a check mechanism which regulates the operation of the automatic plowing depth control mechanism (switches between activation and deactivation) by software or hardware. The check mechanism can control ON and OFF of the automatic cultivation depth control independently of ON and OFF of the automatic cultivation depth SW 8 as described later. Next, the operation flow of the check mechanism will be described in detail.

As shown in FIG. 3, the above-described check mechanism first operates the ignition key (I) in steps S1 and S2.
G) ON (ON state) and OFF (OFF state) are checked. At this time, first, in step S1, the previous ignition key is checked, and if the ignition key is
Check which state was N or OFF, and
Only in the case of F, the ignition key is checked again in step S2, and at this time, the ignition key is turned on.
In step S3, the process proceeds to step S3, where it is checked whether the coupler 16 is connected.

If the coupler 16 is connected, a coupler connection flag is set in step S41. If the coupler 16 is not connected, step S4 is performed.
2 to reset the coupler connection flag, and then to step S5
To check the coupler flag. Note that when the ignition is ON in step S1, and in step S2
Is OFF, the coupler flag is checked directly in step S5.

Thereafter, when the coupler flag is set in step S5 and the coupler connection flag is set, it is checked again in step S6 whether the coupler 16 is connected. If the coupler 16 is not connected, the coupler connection flag is reset in step S7, and the automatic plowing depth control mechanism (automatic plowing depth control) in step S81.
Is set to OFF. If it is determined in step S5 that the coupler connection flag has been reset, the flow directly proceeds to step S81 to turn off the automatic plowing depth control mechanism.
And

On the other hand, if the coupler 16 is connected in step S6, the flow advances to step S82 to turn on the automatic plowing depth mechanism (plowing depth automatic control). Then, after the operations in steps S81 and S82 are completed, the flow returns to repeat the above flow.

The check mechanism operates by the operation of the above flow.
For example, when the rotary work machine 3 and the tractor 1 are separated from each other in the assembling or inspection work, the coupler 16 is removed in step S3 or step S6.
Is checked, and the coupler connection flag is reset. For this reason, the automatic plowing depth control continues to be turned off during the work with the coupler 16 removed, but when the ignition key remains ON even when the coupler 16 is connected at the end of the assembly or inspection work or during the work. , The coupler connection flag is not set, and the automatic tillage depth control remains OFF.

However, once the ignition key is turned on after being turned off, if the coupler 16 is connected,
When the coupler connection flag is set and the coupler connection and the ignition key are kept ON from this state, the automatic plowing depth control is turned ON and the automatic plowing depth control is performed. That is, once the coupler 16 is removed with the ignition key turned on, the automatic plowing depth control is not turned on unless the ignition key is turned off once thereafter.

That is, the check mechanism is switched from a state where the connection between the tillage depth sensor 11 and the control device 7 is disconnected (a state where the coupler 16 is disconnected) to a connection state (a state where the coupler 16 is connected). Control means for prohibiting automatic plowing depth control and for controlling the plowing depth control when the ignition is once turned off (cutting operation) and then turned on (input operation) after the prohibition state of the automatic plowing depth control. The structure has.

For this reason, when the coupler 16 is once removed during assembly or inspection work, and then the coupler 16 is connected again, it is prevented that the rotary working machine 3 is moved up and down due to sudden operation, so that an operator is not expected. The operation of the rotary work machine 3 is prevented. At this time, since the check mechanism has the above-described operation configuration, the tillage depth sensor
It is not necessary to provide a means (switching check means) for checking whether or not the switch has been switched from the non-mounted state to the mounted state, and the control device 7 (check mechanism) makes it relatively easy to switch the operation of the tillage depth control. Can be configured.

In the above switching check means, there is a case where the switching check means malfunctions due to a connection failure of the coupler 16 or disconnection of the wiring (the switching check means checks the connection state of the depth sensor). In the case of the present invention, since the switching of the automatic plowing control is performed based on the ignition ON and OFF, the malfunction (erroneous vertical movement) of the rotary work machine 3 due to the malfunction of the switching check means is also prevented, and the plowing depth is reduced. Switching of automatic control can be performed more reliably.

[0024]

According to the structure of the present invention configured as described above, the connection between the tillage depth sensor and the control device is temporarily cut off during the assembling and inspection work, and then when the tillage working machine is connected, the tillage working machine is suddenly turned off. This has the effect of preventing the tilling machine from being moved up and down by the operation and preventing the tilling work machine from being unexpectedly operated by the operator, and whether the control means has switched the tillage depth sensor from the unconnected state to the connected state as in the prior art. There is no need to provide a means for checking whether or not there is any, and there is an advantage that the means for switching the operation of the tillage depth control can be relatively easily configured by the control means.

In the above control means, the ignition O
Since the switching of the tillage depth control is controlled based on N and OFF, malfunction of the control means due to poor connection between the tillage depth sensor and the control device side, disconnection of the wiring, and the like is prevented, and malfunction of the tillage work machine (mis-elevation) ) Is also prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a block diagram of a tillage depth control device.

FIG. 3 is an operation flowchart of a check mechanism.

[Explanation of symbols]

 3 rotary work machine (tiling work machine) 7 control device 9 tillage depth setting device 11 tillage depth sensor

Continued on the front page. (72) Inventor Toyoharu Endo, 667 Iida-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Satoshi Tamura 667 Iya-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 Mitsubishi Within Agricultural Machinery Co., Ltd. (72) Inventor Shigeharu Kimura, 667, Iya-cho, Oji-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Within Mitsubishi Agricultural Machinery Co., Ltd. Agricultural machinery F term (reference) 2B304 KA01 KA16 LA02 LA06 LB05 LB15 MA04 MB01 MC17 PC13 PD19 QA02 QA15 QB15 QC03 RA28

Claims (1)

[Claims] 1. Tillage depth setting device (9) and tillage depth sensor (11)
And a control device (7) for raising and lowering the tilling machine (3) based on the setting value of the setting device (9) and the detection value of the sensor (11) to control the cultivation depth. Means for inhibiting the tillage depth control when the connection between the tillage depth sensor (11) and the control unit (7) is switched from a disconnected state to a connected state is provided on the control device (7) side. A tillage depth control device for a plowing machine, further comprising control means for turning off the ignition once after the tillage depth control prohibition state and then controlling the tillage depth when the ignition operation is performed.