JP2556074Y2 - Tractor rotary control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor rotary control device provided with an electric actuator for controlling the movement of a rear cover.

[0002]

2. Description of the Related Art
Among the rotators connected to this kind of tractor, an electric actuator for rear cover movement control is provided to always control the rear cover having the tillage depth detection function to the appropriate position regardless of the tillage depth change and to improve the tillage depth detection accuracy. In this case, it is necessary to connect and disconnect the wiring for the electric actuator as the rotary is attached and detached. However, in the past, even when the rotary was attached / detached, the wiring could be energized.Therefore, when connecting the wiring, sparks might be generated between the contacts and the contacts might be damaged. In such a case, the separated contact may come into contact with another member and cause a short circuit, which has been a problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to provide a rotary control device for a tractor capable of eliminating these disadvantages in view of the above-mentioned circumstances. An electric actuator for controlling the movement of the rear cover is provided on a rotary detachably connected to the rear of the vehicle, while an operating signal is supplied to the electric actuator via a contact that is connected and detached with the traveling body when the rotary is attached or detached. In a tractor provided with a rotary control unit that outputs a signal, the rotary control unit is provided with an operation signal output stop control unit that stops output of an operation signal based on detection of detection of attachment / detachment of a rotary and stops energization. It is assumed that. Alternatively, an electric actuator for controlling the movement of the rear cover is provided on a rotary detachably connected to the rear part of the traveling body, while the traveling body is electrically driven via a contact that is connected and separated when the rotary is attached and detached. In a tractor having a rotary control unit that outputs an operation signal to an actuator and feeds back an operation state of the electric actuator,
The rotary control unit further comprises an operation signal output stop control means for stopping the output of the subsequent operation signal and stopping the energization when the operation of the electric actuator is not fed back even when the operation signal is output. It is. According to the present invention, with this configuration, it is possible to reliably prevent the occurrence of sparks between the contacts and to protect the contacts,
The short circuit of the contact can be surely prevented.

[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 3 is connected to a rear portion of the traveling body 1 via a lifting link mechanism (not shown) and an automatic hitch mechanism 2 so as to be able to move up and down. The working unit 3 is moved up and down by the vertical swing of the lift arm 4 accompanying the expansion and contraction operation of a lift cylinder (not shown), and these basic configurations are all conventional.

A top hook 6 pivotally connected to the tip of the top link of the lifting link mechanism is fixed to the center upper end of the hit frame 5 constituting the automatic hitch mechanism 2. A lower hook 7 pivotally connected to each end of the left and right lower links of the lifting link mechanism is fixed, and the work unit 3 is raised while the top hook 6 is locked to the top mast 8 on the work unit 3 side. Thus, the connecting pin 9 on the working section 3 side is automatically engaged with the lower hook 7 so that the working section 3 is automatically mounted. Reference numeral 10 denotes a PTO connecting portion provided on the center plate 5a of the hitch frame 5. The input side of the PTO connecting portion 10 is connected to the PT 1 of the traveling body 1 via a universal joint 11 in advance.
While being connected to the O-shaft 12, the output side of the PTO connecting part 10 is automatically connected to the input shaft 13 of the working part 3 along with the above-mentioned automatic mounting, and when the working part 3 is disconnected, It is configured with a clutch mechanism that separates automatically.

On the other hand, the working unit 3 includes a gear case 14 in which the input shaft 13 protrudes forward,
4, a tilling claw 16 that is rotated by power via a shaft case 14a and a chain case (not shown), a main cover 17 that covers the rotation locus of the tilling claw 16, and a vertically swingable rearward of the main cover 17. The rear cover 1 and the like are provided.
The eight base pivot portions 18a are integrally connected to a guide member 19 that can move back and forth along the arc of the main cover 17.

Reference numeral 20 denotes a cylinder interposed between the bracket 19a of the guide member 19 and the top mast 8, and the cylinder 20 controls the movement of the rear cover 18 by the expansion and contraction operation based on the driving of the electric motor 21. However, the electric motor 21 is provided with the working unit 3 described above.
Is connected to a control unit 23 of the traveling body 1 via a coupler device 22 which is automatically connected and disconnected in accordance with the automatic attachment / detachment.

The coupler device 22 includes a hitch frame 5
And a working unit-side coupler 22b provided in the gear case 14 of the working unit 3. The body-side coupler 22a has a required number of fixed contacts 25 connected to the machine-side wiring 24, respectively. On the other hand, the working unit-side coupler 22b supports the required number of movable contacts 27 connected to the working unit-side wiring 26 so as to be able to come and go, and urges the movable contacts 27 in the projecting direction at all times. The machine 28 is installed inside. When the working part 3 is mounted, the movable contacts 27 are resiliently contacted with the fixed contacts 25 by the urging force of the elastic machine 28, so that the contacts can be reliably connected regardless of slight play or assembly error. Is to be connected to.

Reference numeral 29 denotes a cylinder length detecting mechanism for detecting the operation length of the cylinder 20. The cylinder length detecting mechanism 29 operates the work unit 3 to feed back the detected cylinder length to the control unit 23. To the automatic hit mechanism 2. That is, on the working unit 3 side, a detection rod 30 that is pushed and pulled as the cylinder 20 expands and contracts is provided, and the detection rod 3
0 is connected to a detection arm 31 which is supported by the shaft case 14a so as to be able to swing back and forth, while a driven arm 32 which is swingable back and forth is provided at a position facing the detection arm 31 on the side of the automatic hitch mechanism 2. At the same time, the driven arm 32 is connected to a connecting wire 33 (the other end of the connecting wire 33 is connected to a potentiometer connected to the control unit 23). When the working unit 3 is connected to the automatic hitch mechanism 2, the detection arm 31 and the driven arm 32 come into contact with each other to be in an interlocking connection state. Based on this, a change in the cylinder length of the cylinder 20 is transmitted to the traveling body 1 side. It is being fed back.

Further, reference numeral 34 denotes a plowing depth detecting mechanism for detecting the vertical swing angle of the rear cover 18, and the plowing depth detecting mechanism 34 is connected to the control unit 23 similarly to the cylinder length detecting mechanism 29. It is provided from the work unit 3 to the automatic hitch mechanism 2 for inputting the vertical swing angle (detected tillage depth) of the rear cover 18. That is, on the working unit 3 side, a detection wire 37 connected to the rear cover 18 via the detection rod 35 and the connection link 36 is provided, and the other end of the detection wire 37 is connected to the shaft case 14.
a, on the side of the auto hitch mechanism 2, a driven arm 39, which can swing back and forth, is provided at a position facing the detection arm 38. 39 is connecting wire 4
0 (the other end of the connecting wire 40 is connected to a potentiometer connected to the control unit 23). When the working unit 3 is connected to the automatic hitch mechanism 2, the detection arm 38 and the driven arm 39 come into contact with each other to be in an interlocking connection state. It is being fed back.

On the other hand, reference numeral 41 denotes a fender panel disposed on the side of the driver's seat 42. At the exposed position of the fender panel 41, a working unit elevating lever 43 and a plowing depth setting volume 44, which are extremely frequently operated, are provided. At the position covered by the transparent opening / closing cover 45, a tilt setting volume 46, an automatic switching switch 47, a control sensitivity adjusting switch 48, and a manual operation switch 49, which are not so frequently operated, are provided.

Reference numeral 50 denotes an operation box provided below the driver's seat 42 (which is rotatable between a position where the operator can take a seat and a position where the lower portion of the driver's seat 42 is exposed).
The operation box 50 has a cover 51 which can be opened and closed freely. Inside the operation box 50, a dusting position switching switch 52, a tire size switching switch 53, a raising restriction position adjusting volume 54, a mode switching switch 55, and a mode switching switch 55 which are infrequently operated are provided. A function switching switch 56 and a link setting switching switch 57 are provided.

The control unit 23 has a so-called microcomputer and is arranged below the driver's seat 42 like the operation box 50. The control unit 23 transmits the various operation signals and detection signals. It is configured to input and output an operation signal to an actuator such as the lift cylinder, the electric motor 21 or the like based on the determination based on these input signals. Then, in the control unit 23 of the embodiment, the plowing depth automatic control for raising and lowering the working unit 3 based on the vertical swing angle of the rear cover 18 in order to maintain the set plowing depth of the plowing depth setting volume 44, and the rear cover 18 At least continuous control of the rear cover movement control for controlling the expansion and contraction of the cylinder 20 based on the set plowing depth of the plowing depth setting volume 44 and the contact protection control to be described later so as to maintain an appropriate detection posture regardless of the plowing depth change is at least continuous. To do it.

In the contact protection control which is the gist of the present invention, first, as shown in the flowchart of FIG. 10, it is determined whether or not a determination has been made to operate the electric motor 21 in the rear cover movement control. If NO is determined here, the output of the motor operation signal is stopped and the electric motor 21 is stopped.
On the other hand, if it is determined to be YES, either a forward or reverse motor operation signal is output, but if the motor operation signal is output, the electric motor is output based on the feedback signal after a predetermined timer time has elapsed. It is determined whether or not the motor 21 has actually operated, and if this determination is YES, the output of the motor operation signal is continued, while if NO, the output of the motor operation signal is output. You're going to stop. That is, when the operation of the electric motor 21 is not fed back despite the output of the motor operation signal, the coupler device 22 is determined to be in the separated state and the output of the motor operation signal is stopped.
When the work unit 3 is automatically mounted, the body side wiring 24 is prevented from being energized, and based on this, the problem of spark generation between the fixed contact 25 and the movable contact 27 is reliably prevented. When the working unit 3 is separated, the signal output is immediately stopped based on the separation between the fixed contact 25 and the movable contact 27 even if the provisional machine body-side wiring 24 is in an energized state. The inconvenience of short-circuiting due to contact with other members is surely prevented.

In the embodiment of the present invention configured as described above, when the working unit 3 is mounted on the traveling machine body 1, the coupler device 22 is automatically connected with this.
The control unit 23 recognizes the attachment / detachment state of the coupler device 22 based on the presence / absence of the feedback signal, and stops the output of the motor operation signal in the separation state. It is possible to reliably prevent spark from being generated between the movable contact 25 and the movable contact 27. Therefore, it is possible to completely eliminate the inconvenience that the contact is damaged based on the occurrence of the spark, and as a result, it is possible to greatly improve the durability of the contact.

Further, when the working unit 3 is separated, the signal output is immediately stopped based on the separation between the fixed contact 25 and the movable contact 27 even if the provisional machine body side wiring 24 is energized. Also, the disadvantage that the movable contact 27 is short-circuited by contact with another member can be reliably prevented.

Further, the output of the motor operation signal is stopped based on the presence or absence of the feedback signal.
Even when the electric motor 21, the rear cover moving mechanism, the sensor, and the like are abnormal, the output of the motor operation signal is stopped,
Therefore, it is possible to reliably prevent the inconvenience that the parts are damaged due to the unreasonable operation at the time of abnormality, and to effectively protect the electric motor 21 and the like.

Further, in the present invention, the coupler device 2
Since the connection and disconnection of the coupler device 22 can be recognized without providing a detection switch for detecting the connection and disconnection of
The number of parts can be reduced by eliminating the need for the detection switch and its wiring.

The present invention is, of course, not limited to the above-described embodiment. For example, as in the second embodiment shown in FIGS. 11 and 12, a connection detecting switch provided on the body-side coupler 22a. It goes without saying that the energization of the body-side wiring 24 may be turned on and off based on the detection at 58.

[0020]

In summary, since the present invention is configured as described above, the present invention outputs an operation signal to the electric actuator through a contact which is connected and disconnected when the rotary is attached and detached, while the rotary actuator outputs the operation signal to the electric actuator. Since the operation signal output is stopped and the power supply is cut off when attaching / detaching, the power supply to the machine side wiring is restricted when the contacts are connected with the rotary mounting, and the occurrence of sparks between the contacts is ensured. Can be prevented. Therefore, it is possible to completely eliminate the inconvenience that the contact is damaged based on the occurrence of the spark, and as a result, it is possible to greatly improve the durability of the contact.

Further, when the rotary is cut off, the output of the operation signal is similarly stopped, and the energization is cut off, so that the inconvenience that the contact in the separated state is short-circuited due to contact with another member is also ensured. Can be prevented.

Further, when the output of the operation signal is stopped based on the presence or absence of the feedback signal, the output of the operation signal is also stopped when the electric actuator, the rear cover moving mechanism, the sensor, etc. are abnormal. For,
It is possible to reliably prevent the inconvenience that the parts are damaged due to the unreasonable operation at the time of abnormality, and to effectively protect the electric actuator or the like. Further, in this device, the connection and separation of the contacts are recognized without providing a connection detection switch for detecting the connection of the contacts, so that the number of components can be reduced by eliminating the need for the detection switch and its wiring.

[Brief description of the drawings]

FIG. 1 is a plan view of a tractor.

FIG. 2 is a front view of a rotary connecting portion.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is a cross-sectional view of the coupler device.

FIG. 6 is a front view of a control space.

FIG. 7 is a front view of a control unit.

FIG. 8 is a plan view of the same.

FIGS. 9A and 9B are perspective views of the operation box showing a state in which the cover is closed and opened, respectively.

FIG. 10 is a flowchart showing a control procedure of contact protection control.

FIG. 11 is a cross-sectional view illustrating a coupler device according to a second embodiment.

FIG. 12 is a flowchart showing a second contact protection control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Auto hitch mechanism 3 Working part 18 Rear cover 20 Cylinder 21 Electric motor 22 Coupler device 23 Control unit

Claims (2)

(57) [Scope of request for utility model registration] An electric actuator for controlling the movement of a rear cover is provided on a rotary detachably connected to a rear portion of a traveling body, and a contact which is connected and disconnected when the rotary is attached to and detached from the traveling body. In a tractor provided with a rotary control unit that outputs an operation signal to an electric actuator through the tractor, an operation signal output stop control that stops output of an operation signal based on detection of attachment / detachment detection of a rotary and stops energization in the rotary control unit. A tractor rotary control device comprising means. 2. An electric actuator for controlling the movement of a rear cover is provided on a rotary detachably connected to a rear portion of a traveling body, and a contact connected and disconnected when the rotary is attached to and detached from the traveling body. In a tractor provided with a rotary control unit for outputting an operation signal to the electric actuator through the feedback control unit and inputting the operation state of the electric actuator in a feedback manner, the operation of the electric actuator is fed back even if the operation signal is output to the rotary control unit. A rotary control device for a tractor, comprising an operation signal output stop control means for stopping the output of the subsequent operation signal when no input is made and cutting off the energization.