JP3234119B2 - Rear cover movement control device for tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear cover movement control device for a tractor to which a working unit having a movable rear cover is connected.

[0002]

2. Description of the Related Art In general,
In the working part connected to this kind of tractor, the swing fulcrum of the rear cover functioning as a leveling plate and tillage detector,
There are some which can be moved to an appropriate position based on driving of an actuator. Conventionally, however, the actuator is drive-controlled in conjunction with the operation of a high working depth setting device (one that sets a target working depth of automatic working depth control) during operation (the rear cover is in a grounded state). There is a case where the rear cover is forcibly lowered based on the plowing depth setting operation during the work, so that the rear cover and the actuator may be deformed or damaged by receiving a thrusting force of the ground.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a rear cover movement control device for a tractor that can eliminate these problems. An actuator for forcibly moving the swing fulcrum position of the rear cover provided in the working unit, a control unit for outputting a drive command to the actuator based on a predetermined operation signal, and automatic plowing depth control.
Automatic plowing depth switch for ON-OFF and automatic plowing depth
In a tractor including a working depth setting volume for setting a target working depth of control and a work switching operation tool capable of switching a work control mode of the control unit, the control unit includes, in accordance with a switching position of the work switching operation tool. In providing the rear cover movement control means for controlling the movement of the rear cover, the rear cover
-The movement control means switches the tillage depth automatic switch to ON.
In the tilled working position
When the switching operation is performed, the rear cover is
And the work switching operation tool switches to the substitute work position.
If operated, move the rear cover to the predetermined lower position.
Dynamic control, and not the tilling work position
If the switch is made to a working position other than the
A movement control device for a rear cover in a tractor, wherein the movement of the rear cover is configured to be stopped .
According to the present invention, it is possible to prevent the rear cover, the actuator, and the like from being deformed or damaged due to the driving of the actuator during the operation.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a tractor, and a rotary tilling type working unit 4 is provided at a rear portion of the traveling body 1 via an elevating link mechanism 2 and an automatic hitch mechanism 3.
Are connected so as to be able to move up and down. The working unit 4 is vertically moved up and down based on the hydraulic operation of the lift arm 5 connected to the lifting link mechanism 2, and these basic configurations are all conventional.

Reference numeral 6 denotes a hitch frame constituting the automatic hitch mechanism 3. A top hook 7 pivotally connected to the tip of the top link 2a of the lifting link mechanism 2 is fixed to the upper end of the center of the hitch frame 6. On the other hand, on the left and right sides of the lower end portion of the hitch frame 6, lower hooks 8 pivotally connected to the tips of the left and right lower links 2b of the lifting link mechanism 2, respectively.
Is fixed. That is, when the working part 4 is raised in a state where the top hook 7 is engaged with the top mast 9 on the working part 4 side, the connecting pin 10 on the working part 4 automatically engages with the lower hook 8 and the working part 4 When the work unit 4 is lowered to the ground position after performing a predetermined unlock operation described later, first, the engagement of the lower hook 8 is automatically released, and then the engagement of the top hook 7 is performed. Are automatically released, and the working unit 4 is automatically separated from the hitch frame 6.

Reference numeral 11 denotes a hook-shaped lock plate provided on the lower hook 8 so as to be swingable. The lock plate 11 is engaged with the lower hook 8 based on the operation of a detachable operation lever 12 which is interlocked. The rocking posture can be changed between a lock position for locking and locking the pin 10 and a lock releasing position for releasing the locking lock of the connecting pin 10.
Further, while being normally urged toward the locking position by the elastic device 13 connected to the detachable operation lever 12, the stopper 13b of the lower hook 8 comes into contact with the lower hook 8 in a position straddling the engaging groove 8a of the lower hook 8. It can be locked in the unlocked position by the stopper ram 14. That is, when the working unit 4 is automatically mounted as described above, the stopper spring 1 is set on the basis of the contact of the connecting pin 10 engaging with the lower hook 8.
4 is automatically disengaged and the lock plate 11 automatically changes to the locked position. On the other hand, when the working unit 4 is automatically disengaged, the lock plate The automatic release as described above is performed by locking the lock plate 11 in the unlocked position. However, at the time of release, the stopper spring 14 locks the lock plate 11 based on the contact with the connecting pin 10. The lock plate 11 is locked in the unlocked position, and after the connecting pin 10 is detached, the lock plate 11 is continuously locked in the unlocked position based on contact with the stopper piece 8b.

On the other hand, a rear cover 15 for leveling the tilling soil is provided at the rear end of the working section 4 so as to be able to swing up and down. It is configured to be movable (movable up and down) along an arc and to be forcibly moved based on the expansion and contraction operation of the electric cylinder 16. That is, the rear cover 15 functioning as a leveling plate or a tillage depth detector can be controlled to move to an appropriate position according to the work.

Reference numeral 19 denotes a tillage depth sensor (potentiometer) provided on the traveling machine body 1 side.
Detects the tillage depth based on the vertical swing angle of the rear cover 15. That is, the swing arms 20 and 21 that resiliently contact each other with the automatic mounting of the work unit 4 are arranged on the work unit 4 and the hitch frame 6, respectively. Wire 22
And the like, while the swing arm 21 on the side of the hitch frame 6 is connected to the detection arm 19a of the cultivation depth sensor 19 via the wire 23. The detection arm 19a of the tillage depth sensor 19 can be linked to the rear cover 15 to detect the tillage depth. It swings to the non-detection area.

Reference numeral 25 denotes a rear cover position sensor (potentiometer) provided on the traveling body 1 side.
The rear cover position sensor 25 is connected to a swing fulcrum of the rear cover 15 through a connection mechanism substantially similar to that of the tillage depth sensor 19. In other words, the swing arms 26 and 27 that resiliently contact each other with the automatic attachment and detachment of the work unit 4 are arranged on the work unit 4 and the hitch frame 6, respectively. Since the swing arm 27 on the side of the hitch frame 6 is connected to the detection arm 25a of the rear cover position sensor 25 via the wire 29 while being connected to the rear cover 15 via the rod 28, the work unit 4 is not mounted. , Rear cover position sensor 25
The detection arm 25a is interlocked with the rear cover 15 and can detect the position of the rear cover. However, when the working unit 4 is detached, the detection arm 25a It swings up to.

On the other hand, reference numeral 31 denotes a switching operation panel provided on the traveling machine body 1. The switching operation panel 31 has a dashing prevention control (a control for automatically reducing the descending speed of the working unit 4 near the contact height). A dashing position setting volume 32 for setting a control height; a tire size setting volume 33 for setting a tire size; a work changeover switch 35 for switching a control mode of a control unit 34 described later according to work; A lifting control volume 36 for setting the height of the lift 4 and a function changeover switch 37 for switching various functions are incorporated. These operating tools are operated at the time of non-work such as at the start of work. Therefore, it is arranged at a position where it is difficult to operate during operation. The work changeover switch 35 is connected to a tilling work position that is switched when performing a tilling work using a standard rotary (genuine rotary), a slashing work position that is switched when performing a slashing work with a standard rotary, and a drive type harrow. The drive-type harrow position that is switched in the case, a rotary other than the standard rotary (a rotary made by another company, etc.) or a rotary / other position that is switched when other working machines are connected, a check position that is switched in the case of performing a sensor check, etc. It is set in advance.

The control section 34 is constructed by using a so-called microcomputer (including a CPU, a ROM, a RAM, an interface, etc.). 25, a dashing position setting volume 32, a tire size setting volume 33, a work changeover switch 35, a lifting regulation volume 36, and a function changeover switch 37, and a lever angle sensor 3 for detecting a lever angle of a working unit elevating operation lever.
9, an arm angle sensor 40 for detecting the vertical swing angle of the lift arm 5, an automatic cultivation depth switch 41 for turning on and off the automatic cultivation depth control, and a cultivation depth for setting a target cultivation depth for the automatic cultivation depth control. While a signal is input from the setting potentiometer 42 or the like, an operation signal is output to the electric cylinder 16 and the electromagnetic valve of the lift cylinder for hydraulically operating the lift arm 5 based on the judgment based on these input signals. ing. That is, the control unit 34 controls the position of the working unit 4 based on the operation of the raising / lowering operation lever 38 so as to raise and lower the working unit 4. Control software such as automatic plowing depth control for raising and lowering the vehicle and rear cover movement control for controlling the movement of the rear cover 15 by driving the electric cylinder 16, among these controls, the control of the rear cover movement control which is the gist of the present invention. The procedure is described in detail below.

In the rear cover movement control, first, it is determined whether or not the automatic plowing switch 41 is ON. If the determination is NO, the process returns to the main routine. , Work changeover switch 35
Is determined to be the tilling operation position by the standard rotary. If the determination is YES, the electric cylinder 16 is contracted to the minimum contraction position. That is, in the tilling work using the standard rotary, the rear cover 15 is moved to the highest position that can be adapted to the deep tilling work.

On the other hand, when the work changeover switch 35 is at a position other than the tilling work position, it is determined whether or not the present position is a substitute rotary work position by a standard rotary. If the determination is NO, the electric cylinder 16 is maintained in a stopped state. However, if the determination is YES, the electric cylinder 16 is extended to the maximum extension position. That is, in the plowing operation using the standard rotary, the rear cover 15 is moved to the lowest position because the plowing depth is small. Therefore, even if the electric cylinder 16 is extended, the rear cover 15 can be prevented from receiving a thrust force or the like on the ground .

In the embodiment of the present invention constructed as described above, the position of the swing fulcrum of the rear cover 15 is
Although the movement is controlled based on the expansion / contraction operation of No. 6, the electric cylinder 16 operates to the position corresponding to the work only when the work changeover switch 35 is switched. That is, the switching operation of the work changeover switch 35 is performed at the time of non-work such as at the start of work, so that even if the temporary electric cylinder 16 is extended,
Can be prevented from receiving the pushing force of the ground. Accordingly, there is no fear that the electric cylinder 16 is driven to expand and contract while the rear cover 15 is in contact with the ground, as in the related art in which the electric cylinder 16 is drive-controlled to interlock with the plowing depth setting volume 42 that is frequently operated during work. As a result, the inconvenience that the rear cover 15 and the electric cylinder 16 are deformed or damaged by the thrust of the ground or the like can be eliminated.

Also, during the ridge-raising operation performed by fixing the rear cover 15 in a flipping posture or the like, the electric cylinder 16
As the electric cylinder 16 is interlocked with the tillage depth setting volume 42, the rear cover 15 and the electric cylinder 16 are damaged by erroneously operating the tillage depth setting volume 42 during the ridge-raising operation. Inconvenience can also be eliminated.

[0016]

In summary, since the present invention is constructed as described above, the swing fulcrum position of the rear cover is forcibly moved based on the drive of the actuator, but the control mode is changed according to the work. It has a work switching operation tool for switching, and the movement of the rear cover is controlled in accordance with the switching position of the operation tool. That is, the work switching operation tool is
Since the switching operation is normally performed at the beginning of the work, there is no fear of driving the actuator during the work in which the rear cover is grounded. Therefore, it is possible to prevent the rear cover from being forcibly lowered based on the operation of setting the working depth, as in the related art in which the actuator is driven and controlled in conjunction with the operation of the working depth setting device. The inconvenience that the actuator or the actuator is deformed or damaged by the thrust of the ground or the like can be eliminated.

[Brief description of the drawings]

FIG. 1 is a side view of a working unit connected to a traveling machine body.

FIG. 2 is a front view of a hitch frame.

FIG. 3 is a plan view of the same.

FIG. 4 is a main part side view showing a connection mechanism of the tillage depth sensor.

FIG. 5 is a side view of a main part showing a coupling mechanism of the rear cover position sensor.

FIG. 6 is a side view of the tillage depth sensor.

FIG. 7 is a side view of a rear cover position sensor.

FIG. 8 is an explanatory diagram illustrating a detachment process of a working unit.

FIG. 9 is a front view of a switching operation panel.

FIG. 10 is a block diagram showing input and output of a control unit.

FIG. 11 is a flowchart of rear cover movement control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 4 Working part 15 Rear cover 16 Electric cylinder 25 Rear cover position sensor 31 Control part 35 Work changeover switch

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01B 33/12 A01B 63/114

Claims (1)

(57) [Claims] 1. An actuator for forcibly moving a swing fulcrum position of a rear cover provided in a working unit, a control unit for outputting a drive command to the actuator based on a predetermined operation signal, and turning on automatic plowing depth control -To turn off
Of the automatic plowing depth switch and the target plowing depth of the automatic plowing depth control
A tractor having a working depth setting volume to be controlled and a work switching operation tool capable of switching a work control mode of the control unit, wherein the control unit controls the rear cover to move according to a switching position of the work switching operation tool. In providing the control means, the rear cover movement control means
In the state that the automatic tillage depth switch is turned on,
When the work switching operation tool is switched to the tilling work position
Controls the rear cover to move to the predetermined
When the replacement operation tool is switched to the substitute work position,
Control the movement of the rear cover to the predetermined lowering position, and further plow
To a work position that is not a work position and is not a substitute work position
If the switching operation is performed, the operation of the actuator is stopped.
A movement control device for a rear cover in a tractor, characterized in that it is configured as follows .