JP2590423Y2 - Rolling control device for working unit in work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling control device for a working unit in a work vehicle such as a riding rice transplanter.

[0002]

2. Description of the Related Art
In this type of working vehicle, a working unit connected via a lifting link mechanism and a holder member is supported in a freely rotatable manner, and the working unit is elastically held by a rolling elastic machine so that the working unit can be freely positioned. There is one that performs so-called free rolling control that allows a maintenance operation. However, in this case, since the amount of rolling that can be controlled is limited, there is a disadvantage that the working unit is greatly inclined following the rolling of the traveling machine body in a field with large unevenness. Therefore,
An intermediate member that can be relatively rolled with respect to the holder member and the working unit is provided, and the rolling elastic machine is interposed between the intermediate member and the working unit, and between the intermediate member and the holder member. It has been proposed to perform a complex rolling control by interposing a so-called forced rolling control mechanism for forcibly controlling the rolling (horizontal control or tilt control) of the intermediate member based on the actuator drive. In other words, since the intermediate member serving as the reference point of the rolling machine is controlled horizontally (inclination control in the case of ridge running), free rolling control can always be enabled regardless of the rolling of the traveling body. Since the urging force of the rolling machine is always applied to the member, the intermediate member is tilted and a large moment is applied to the rolling support portion. As a result, smooth rolling of the intermediate member is obstructed and control with high accuracy is performed. However, there is a possibility that the rolling support portion of the intermediate member may be damaged.

[0003]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances, and has as its object to provide a rolling control device for a working unit in a working vehicle that can eliminate these drawbacks. A working vehicle having a working part connected to a holder member connected to the traveling machine body via a rolling support shaft, wherein the intermediate member is relatively free to roll with respect to the holder member and the working part. A member is provided, and between the intermediate member and the holder member, a forced rolling control mechanism that forcibly controls the rolling of the intermediate member based on the actuator drive is provided, while between the intermediate member and the working unit, In interposing a rolling elastic body that controls the rolling of the working part in a passive manner, the intermediate member is inclined between the holder member and the intermediate member based on the urging force of the rolling elastic machine. Is characterized in that interposed the tilting restriction mechanism for the regulating. According to the present invention, with this configuration, the intermediate member is always smoothly rolled to improve the accuracy and stability of the rolling control, and the inconvenience that the rolling support portion of the intermediate member is damaged by the moment is also eliminated. Is made possible.

[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 machine of a riding type rice transplanter, and a planting work section 3 is connected to a rear portion of the traveling machine 1 via an elevating link mechanism 2 that operates to raise and lower hydraulic pressure. The planting work section 3 is a holder frame 4 which is detachably connected to a rear end of the elevating link mechanism 2 and which is integrally provided with a boss 4a which is directed to the front and rear at a lower end, and a boss of the holder frame 4. A rolling support shaft 5 rotatably supported by the portion 4a via a pair of front and rear bearings 5a; a rolling support shaft 5 integrally connected to rear ends of the rolling support shaft 5; A working part frame 6 on which the working part frame 6a is erected, a planter case 7 integrally fixed to the working part frame 6, a planter arm 8 juxtaposed to the planter case 7, and an upper end of the seedling table support stay 6a A seedling mounting table 9 which is supported on the upper part of the unit and the planter case 7 via a slide piece S so as to be able to reciprocate left and right, and which is forcibly fed laterally in accordance with the scraping timing of the planter arm 8;
Center and side floats 1 provided at the center of the bottom of the planter case 7 and at both left and right sides so as to be vertically swingable.
0, 11 and so on. That is, the planting work unit 3
The holder frame 4 connected to the traveling body 1 via the lifting link mechanism 2 is supported by a rolling support shaft 5 so as to be freely rotatable. All of the above basic configurations are the same as those of the related art.

[0005] Reference numeral 12 denotes an intermediate frame provided between the holder frame 4 and the planting section 3, and a boss 12a formed integrally with a lower end of the intermediate frame 12.
Are rotatably fitted to the boss portion 4a of the holder frame 4. That is, the intermediate frame 4 is relatively free to roll with respect to the holder frame 4 and the planting operation section 3, and the rolling fulcrum is at the planting operation section 3.
To match the rolling fulcrum. And the intermediate frame 4 is a frame body 12b in an upright posture.
And a T-shaped frame portion 12c that protrudes forward from the upper end of the frame main body 12b along the back surface of the seedling mounting table 9, but in a side view, the T-shaped supporting portion 6a It is arranged between the seedling mounting table 9.

Further, reference numerals 14 and 15 denote rolling ammunitions each composed of a pair of left and right coil ammunitions.
One of the rolling missiles 14 and 15 is mounted on the frame main body 12 of the intermediate frame 12.
b and the working section frame 6 are interposed in a C-shape to balance the weight of the planting working section 3, and the other rolling bullet 15 is mounted on the T-shaped frame section 12 of the intermediate frame 12.
A c-shape is interposed between c and both ends of the seedling mounting table 9 so as to balance the eccentric load accompanying the lateral feeding of the seedling mounting table 9.

Further, reference numeral 16 denotes the holder frame 4.
And a pinion gear 16a for outputting a driving force of the motor 16 is engaged with an intermediate gear 18 rotatably provided on the bracket 17 via a bracket 17 provided at a side position of the bracket 17 via a bracket 17. However, the intermediate gear 18 has a wider tooth width than a rack 19 described later.

On the other hand, the rack 19 includes the intermediate frame 1
2 is provided so as to protrude laterally, but is formed in an arc shape around a rolling fulcrum of the intermediate frame 12, and the intermediate gear 18 meshes with an outer peripheral side edge in a circumscribed manner. A gear portion 19a is formed. That is, when the intermediate gear 19 rotates with the driving of the motor 16, the intermediate frame 12 is forcibly rolled based on the left and right movement of the rack 19 meshing with the intermediate gear 19. Since the gear 18 is in mesh with the gear 19a formed on the outer peripheral side of the curved rack 19 in a circumscribed manner, the backlash in the mesh between the intermediate gear 18 and the rack 19 is in mesh with the rack 19 in an inscribed manner. Is set smaller than. In addition, 20
Reference numeral denotes an inclination sensor disposed on the rear surface of the intermediate frame 12, and the intermediate frame 12 is forcibly controlled by rolling control (horizontal control or inclination control) by motor control based on detection of the inclination sensor 20.

Reference numeral 21 denotes a regulating pin projecting rearward from the intermediate frame 12.
Is a plate 2 provided integrally with the planter case 7.
The second recess 22a is loosely fitted. And the regulation pin 21
If the rolling of the planting operation unit 3 with respect to the intermediate frame 12 is within a predetermined angle, the planting operation unit 3 moves to the left and right within the recess 22a to allow the rolling of the planting operation unit 3, but the planting operation unit 3 with respect to the intermediate frame 12 When the rolling of the plant 3 reaches a predetermined angle, the rolling comes into contact with the left and right ends of the concave portion 22a to further restrict the rolling of the planting work unit 3. That is, the rolling regulation mechanism of the planting work unit 3 is not set between the holder frame 4 and the planting work unit 3,
Intermediate frame 1 in which rolling bullets 14, 15 are interposed
2 and the planting work section 3.

Reference numeral 23 denotes a bracket projecting downward from the T-shaped frame 12c of the intermediate frame 12, and the lower end of the bracket 23 is provided on the front of a guide plate 24 provided on the upper end of the holder frame 4. It is slidably contacted. In other words, a tilting control mechanism is provided which controls the rearward tilting of the intermediate frame 12 receiving the urging force of the rolling bullet 15 based on the contact of the bracket 23 with the guide plate 24. Then, the contact position of the bracket 23 is
5, the contact force of the bracket 23 can be prevented from increasing on the basis of the so-called leverage principle. .

Further, a pair of left and right cylindrical members 23a is protruded from the contact surface of the bracket 23, and a part of each of the cylindrical members 23a is exposed from the distal end of the cylindrical member 23a. The ball 25 which is rotatably abutted is accommodated. That is, the sliding resistance between the bracket 23 and the guide plate 24 accompanying the rolling of the intermediate frame 12 can be minimized.

By the way, at both left and right end portions of the guide plate 24, bent pieces 24a are formed for restricting the range of movement of the bracket 23 in the left and right direction, so that the amount of rolling of the intermediate frame 12 with respect to the holder frame 4 is restricted. As shown in the figure, the left and right bent pieces 24a are respectively provided with limit switches 26 which detect and operate based on contact with the bracket 23. That is, each limit switch 26 is provided to detect the rolling limit position of the intermediate frame 12 and stop driving the motor 16, and the detection position of the limit switch 26 is set to be as far as possible from the rolling fulcrum ( (A position above the rolling fulcrum at a distance L), so that a highly accurate limit detection can be performed at a position where the swing width of the intermediate frame 12 is large, and a detection error based on a mounting error of the limit switch 26 is minimized. It can be made smaller.

Reference numeral 27 denotes a locking pin provided on the holder frame 4, and the locking pin 27 is supported by a bracket 28 provided on a side portion of the holder frame 4 and having a substantially O-shape in side view so as to be slidable back and forth. However, the rolling operation of the intermediate frame 12 is performed by performing a fitting operation (backward sliding operation) into a lock hole 29a formed in a bullet bracket 29 (for connecting the rolling bullet machine 14) of the intermediate frame 12. Can be locked in a horizontal position.

Further, reference numeral 30 denotes a boss member which is externally and integrally fitted to an intermediate portion of the lock pin 27,
A bolt shaft 30a protruding upward from the boss member 30 includes:
The bracket 28 penetrates a long hole 28 a formed to face the front and rear of the bracket 28, and is screwed to the nut 31. When the nut 31 is loosened, the bolt shaft 30a
Moves along the long hole 28a to allow the sliding operation of the locking pin 27. On the other hand, when the nut 31 is tightened, the movement of the bolt shaft 30a is restricted and the locking pin 27 can be fixed at an appropriate position. Since the tightening force of the nut 31 acts only in the vertical direction, it is possible to avoid the inconvenience that the horizontal locking position of the intermediate frame 12 is changed left and right based on the displacement of the locking pin 27 due to the tightening of the nut 31.

In the embodiment of the present invention constructed as described above, an intermediate frame 12 which can be relatively rolled with respect to the holder frame 12 and the planting work section 3 is provided, and the intermediate frame 12 and the holder frame 4 are connected to each other. While a forced rolling control mechanism is interposed between the intermediate frame 12 and the planting work section 3, rolling rolling machines 14 and 15 are interposed to perform complex rolling control.
A bracket 23 projecting downward from the bracket 23 abuts on the front surface of a guide plate 24 provided at the upper end of the holder frame 4 so as to be slidable left and right. That is, the intermediate frame 12
Although the bracket 23 contacts the guide plate 24 due to the biasing force of the rolling bullet 15, the tilting of the intermediate frame 12 is reliably restricted. Therefore, it is possible to reliably prevent a large moment from acting on the boss portion 12a based on the tilting of the intermediate frame 12, and as a result, it is possible to smoothly perform the rolling operation of the intermediate frame 12, thereby improving the stability and accuracy of the rolling control. It is possible to greatly improve, or it is possible to prevent the boss portion 12a from being damaged.

Further, in the present embodiment, the contact position of the bracket 23 is set near the operating position of the rolling bullet 15, so that the contact force of the bracket 23 increases based on the so-called leverage principle. As a result, the sliding resistance of the bracket 23 can be greatly reduced.

Further, since the bracket 23 contacts the guide plate 24 via the rollable ball 25, the bracket 23 can contact the guide plate 24 with almost no sliding resistance. Therefore, the rolling operation of the intermediate frame 12 can be further smoothly performed.

When the limit switch 26 detects the limit of the operation of the forced rolling control mechanism, the limit switch 26 is configured to directly contact the intermediate frame 12 to be controlled by the forced rolling control mechanism to detect the limit. The detection accuracy can be significantly improved as compared to the case where the limit detection is performed based on the limit.

The detection position of the limit switch 26 is set as far as possible from the rolling fulcrum. The detection error based on the mounting error of 26 can be reduced as much as possible.

Further, a locking pin 27 for locking the intermediate frame 12 to a horizontal position in the event of a failure of the forced rolling mechanism is provided. The locking pin 27 is provided for the nut 31 to the bolt shaft 30a projecting upward. Since the nut 31 is fixed based on the tightening, the tightening force of the nut 31 acts only in the vertical direction.
It is possible to avoid the inconvenience that the horizontal locking position of the intermediate frame 12 changes right and left based on the displacement of the locking pin 27 due to the tightening.

It should be noted that the present invention is not limited to the above-described embodiment. For example, the member interposed between the bracket 23 and the guide plate 24 is a ball 2
The number of rollers is not limited to five, and a rotatable roller 32 may be interposed as in the second embodiment shown in FIG.

[0022]

In summary, since the present invention is constructed as described above, an intermediate member which can be relatively rolled with respect to the holder member and the working part is provided, and the intermediate member and the holder member are provided between the intermediate member and the holder member. While a forced rolling control mechanism is interposed, a rolling elastic machine is interposed between the intermediate member and the working unit, and a space between the holder member and the intermediate member is based on the urging force of the rolling elastic machine. An inclination regulating mechanism for regulating the inclination of the intermediate member is provided. Therefore, the inconvenience of the intermediate member tilting and exerting a large moment on the rolling support part can be surely eliminated, and as a result, the rolling of the intermediate member is smoothed and the stability and accuracy of the rolling control are improved. Forgiveness that can contribute to
The rolling support portion of the intermediate member can be reliably prevented from being damaged by the moment.

[Brief description of the drawings]

FIG. 1 is a side view of a riding type rice transplanter.

FIG. 2 is a side view of a planting work section.

FIG. 3 is a front view of a main part of the same.

FIG. 4 is an enlarged side view of a main part of the above.

FIG. 5 is an enlarged front view of a main part of the above.

FIG. 6 is an enlarged plan view of a main part of the above.

FIG. 7 is an exploded perspective view of the same.

FIG. 8 is a front view of the intermediate frame locking mechanism.

FIG. 9 is a plan view of the same.

FIG. 10 is a side view of the same.

FIG. 11 is a side view of a main part of a tilting control mechanism showing another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Elevating link mechanism 3 Planting work part 4 Holder frame 5 Rolling support shaft 6 Work part frame 6a Seedling support stand 12 Intermediate frame 14 Rolling elastic machine 15 Rolling elastic machine 16 Motor 16a Pinion gear 18 Intermediate gear 19 Rack 21 Control pin 23 Bracket 24 Guide plate 25 Ball

Claims (1)

(57) [Scope of request for utility model registration] 1. A holder member connected to a traveling body side,
In a traveling vehicle that connects a working unit via a rolling support shaft, an intermediate member that is relatively rollable with respect to the holder member and the working unit is provided, and between the intermediate member and the holder member, While a forced rolling control mechanism that forcibly controls the rolling of the intermediate member based on the actuator drive is provided, between the intermediate member and the working unit,
In interposing a rolling elastic machine that controls the rolling of the working unit in a passive manner, between the holder member and the intermediate member,
A rolling control device for a working unit in a working vehicle, comprising a tilt regulating mechanism for regulating a tilt of an intermediate member based on a biasing force of a rolling ammunition.