JP3090836B2 - 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 working vehicle such as a riding rice transplanter.

[0002]

2. Description of the Related Art In a traveling vehicle of this type, a holder member connected to a traveling machine body and a working part supported by the holder member via a rolling support shaft are used today. Between the intermediate member and the working unit, and a rolling elastic machine that controls the working unit in a driven manner is interposed between the intermediate member and the working unit. Rolling control of the intermediate member between the member and the holder member based on actuator drive (horizontal control or tilt control)
It has been proposed to perform complex rolling control through a forced rolling control mechanism. In other words, in order to forcibly control the intermediate member, which is the reference point of the rolling machine, to a constant posture, the following rolling control by the rolling machine can always be enabled regardless of the rolling amount of the traveling aircraft. If the working part rolls too much, excessive force may act on the rolling ammunition, damaging the rolling ammunition.In addition, even after the intermediate member has reached the rolling limit, the actuator continues to drive to the actuator. There is a concern that each part may be distorted by an overload or by a driving force of the actuator. Therefore, between the intermediate member and the working unit, a rolling regulating mechanism that regulates the rolling of the working unit with respect to the intermediate member at a predetermined angle is interposed to prevent breakage of the rolling machine, and a forced rolling control mechanism is provided. It is proposed to prevent the actuator from overloading and distorting each part by connecting a limit stop mechanism for detecting that the intermediate member has rolled at a predetermined angle with respect to the holder member and stopping the drive of the actuator. However, in this case, even if the intermediate member is within the allowable rolling range, when the relative rolling angle between the intermediate member and the working unit reaches the set angle of the rolling restricting mechanism, the driving force of the actuator is reduced by the working unit load. Because the rolling of the intermediate member is regulated by losing
There is a concern that the intermediate member cannot reach the detection angle of the limit stop mechanism, and in this case, the actuator continues to be driven, which may cause an overload of the actuator and distortion of each part.

[0003]

SUMMARY OF THE INVENTION The present invention has been made 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. An intermediate member, which is rotatable with respect to the holder member and the working part, is provided between the holder member connected to the traveling body and the working part supported by the holder member via a rolling support shaft. In the meantime, between the intermediate member and the working portion, a rolling elastic machine for controlling the rolling of the working portion is interposed, and the intermediate member is forcibly provided between the intermediate member and the holder member based on the actuator drive. In a traveling vehicle having a forced rolling control mechanism for performing rolling control, the rolling of the working unit with respect to the intermediate member at a predetermined angle between the intermediate member and the working unit. In while interposed rolling restricting mechanism for restricting the Rimitsuto stop mechanism for restricting the rolling with respect to the holder member of the intermediate member at a predetermined angle is provided, the Rimitsuto stop angle with respect to the holder member of the intermediate member, the rolling relative to the intermediate member of the working unit The angle is set to be substantially the same as or smaller than the restriction angle. With this configuration, the present invention prevents the actuator from continuing to be driven based on the fact that the intermediate member cannot reach the detection angle of the limit stop mechanism, thereby causing an overload of the actuator and distortion of each part. To
It is something that can be eliminated .

[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 (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 unit 3 is a holder frame (holder member) 4 which is detachably connected to a rear end of the elevating link mechanism 2 and which is integrally provided with a boss 4a facing forward and backward at a lower end thereof. A rolling support shaft 5 rotatably supported by a boss portion 4a of the frame 4 via a pair of front and rear bearings 5a, integrally connected to a rear end of the rolling support shaft 5, and seedlings at both left and right ends. A working unit frame 6 on which the mounting table support stay 6a is erected, a planter case 7 integrally fixed to the working unit frame 6, and the planter case 7
Arm, the upper end of the seedling table support stay 6a and the upper end of the planter case 7 are supported via a slide piece S so as to be able to reciprocate left and right. It comprises a seedling mounting table 9 in a forwardly inclined posture, which is forcibly fed sideways, a center and side floats 10 and 11 which are provided at the center of the bottom of the planter case 7 and on both left and right sides so as to be vertically swingable. That is, the planting work section 3 moves the holder frame 4 connected to the traveling machine body 1 through the lifting link mechanism 2.
It is rotatably supported via a rolling support shaft 5, but all of the above basic configurations are the same as those of the related art.

[0005] Reference numeral 12 denotes an intermediate frame (intermediate member) interposed between the holder frame 4 and the planting work section 3 (the seedling mounting table 9). The formed boss portion 12a is rotatably and externally supported on 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 coincides with the rolling fulcrum of the planting operation section 3. The intermediate frame 4 is composed of a frame body 12b in an upright posture and a T-shaped frame portion 12c protruding forward from the upper end of the frame body 12b along the rear side surface of the seedling mounting table 9. However, the intermediate frame 12 in a side view is disposed so as to be located between the seedling table support stay 6 a and the seedling table 9.

[0006] Reference numeral 14 denotes a first rolling ammunition constituted by a pair of left and right coil ammunition. The first rolling ammunition 14 is provided between the frame body 12b of the intermediate frame 12 and the working section frame 6. It is interposed in a C shape. In other words, the overall load of the planting work section 3 is balanced based on the elasticity of the first rolling machine 14, but at the time of planting work, the joint shaft (the one connecting the body side PTO shaft and the work section side input shaft). ) Since the planting work section 3 attempts to roll in a predetermined direction based on the rotational force of J, a larger biasing force is set to the coil ammunition on the side that extends when rolling in the direction than the coil ammunition on the other side. By doing so, the posture of the working section during the planting operation is maintained in parallel.

[0007] Reference numeral 15 denotes a second rolling ammunition composed of a pair of left and right coil ammunition. The second rolling ammunition 15 includes a T-shaped frame portion 12c of the intermediate frame 12 and both ends of the seedling mounting table 9. Is placed in a C-shape between
This balances the eccentric load caused by the lateral feed. That is, the planting work section 3 which can be freely rolled is held by the first and second rolling machines 14 and 15, and the center float 10 and the side float 1 are held.
The so-called driven rolling control that allows the planting operation unit 3 to follow the paddy field based on the buoyancy is performed.

On the other hand, reference numeral 16 denotes a motor (actuator) provided with a speed reduction mechanism at a side position of the holder frame 4 via a bracket 17, and a pinion gear 16a for outputting a driving force of the motor 16 has a bracket. 1
An intermediate gear 18 rotatably provided on the gear 7 is meshed with the intermediate gear 18. The intermediate gear 18 is set to have a wider tooth width than a rack 19 to be described later.
The occurrence of disengagement based on the backlash in the front-rear direction is surely avoided.

The rack 19 is provided so as to protrude laterally from the intermediate frame 12.
A gear portion 19a is formed on the outer peripheral side of the outer peripheral side at the outer peripheral side so as to mesh with the intermediate gear 18 in a circumscribed manner. 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, and the intermediate gear 18 has a gear portion 19a formed on the outer peripheral side of the curved rack 19. As a result, the backlash in the engagement between the intermediate gear 18 and the rack 19 can be set smaller than that in the case where the intermediate gear 18 and the rack 19 are inscribed in the rack 19.

Reference numeral 20 denotes a pendulum type or other rolling detection sensor provided on the rear surface of the intermediate frame 12 via an L-shaped sensor bracket 20a. The rolling detection value of the rolling detection sensor 20 is transmitted to a control unit (not shown). The control unit controls the motor 16 to drive the motor 16 forward and reverse so that the input rolling detection value matches a predetermined set value (horizontal set value or tilt set value). 12 is forcibly controlled in a fixed posture (horizontal control or tilt control).

Reference numeral 21 denotes a regulating pin projecting rearward from the intermediate frame 12, and the regulating pin 21 is loosely fitted into a concave portion 22a of a regulating plate 22 provided integrally with the planter case 7 to be planted. It constitutes a rolling regulation mechanism of the attachment working unit 3. That is, if the relative rolling angle of the planting operation unit 3 with respect to the intermediate frame 12 is within the predetermined angle B, the regulating pin 21 allows the planting operation unit 3 to roll. 3
When the relative rolling angle has reached the predetermined angle B, the right and left ends of the concave portion 22a are contacted to restrict further rolling of the planting work section 3.

Reference numeral 23 denotes a T-shaped frame 1 of the intermediate frame 12.
A lower end of the bracket 23 is slidably contacted with a front surface of a guide plate 24 provided at an upper end of the holder frame 4. That is, a tilt restricting mechanism that restricts the rearward tilting of the intermediate frame 12 receiving the urging forces of the rolling bullets 14 and 15 based on the contact of the bracket 23 with the guide plate 24 is configured.

Further, a pair of left and right cylindrical members 23a is protrudingly provided on the guide plate 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. A ball 25 that rolls against the roller 24 is accommodated therein. 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.

At the left and right ends of the guide plate 24, a pair of left and right bent pieces 24a facing each other across the lower end of the bracket 23 are formed.
The left and right contact pieces 23b formed on the bracket 23
Switch 26 that detects and operates based on contact with the
Are provided respectively. That is, the left and right limit switches 26 are connected to the intermediate frame 1 with respect to the holder frame 4.
2 detects that the relative rolling angle has reached a predetermined angle A, and outputs the detection signal to the control unit to automatically stop the motor 16. The limit switch 26 controls the intermediate frame 12 by the limit switch 26. Detection angle A
Is substantially the same as the restriction angle B of the planting work section 3 by the rolling restriction mechanism (substantially the same range indicates the assembly error of each member,
(The range in which the limit switch 26 is turned ON by absorbing distortion or the like) or smaller than the restriction angle B. That is, the intermediate frame 12 reaches the limit detection angle A before the relative rolling angle between the intermediate frame 12 and the planting work section 3 reaches the restriction angle B of the rolling restriction mechanism, so that the automatic limit stop can be reliably performed. I'm sorry.

Incidentally, the limit switch 26 includes:
Detecting portion 26b which can freely appear and disappear in limit switch body 26a
The built-in switch is used to detect the immersion of the detection unit 26b. Therefore, the limit detection angle A is set so that the contact piece 23b of the bracket 23 is
b is set with reference to the angle at which the internal switch is immersed to the ON position of the built-in switch.
The intermediate frame angle C when the contacting piece 23b further presses the detecting portion 26b and contacts the limit switch main body 26a based on the failure or the like is set to be larger than the regulation angle B of the planting work section 3 by the rolling regulation mechanism. Have been. Further, the distance K1 (the restriction pin 21 and the restriction plate 2) when the intermediate frame 12 is located at the limit detection angle A is set.
The relationship between the distance 2 and the distance K2 (the distance between the contact piece 23b and the limit switch main body 26a) is set as shown in the following equation. K1 × L2 / L1 <K2 That is, even if the intermediate frame 12 rolls beyond the limit detection angle A based on a failure of the limit switch 26, the contact piece 23b of the intermediate frame 12 contacts the limit switch body 26a. Since the restricting action is previously performed by the rolling restricting mechanism, it is possible to reliably restrict the contact of the contact piece 23b with the limit switch body 26a.

In the embodiment of the present invention constructed as described above, the intermediate frame 12 which is relatively rollable with respect to the holder frame 12 and the planting work section 3 is provided, and the intermediate frame 12 and the planting work section 3 are provided. , While a forced rolling control mechanism is provided between the intermediate frame 12 and the holder frame 4, and the motor 16 of the forced rolling control mechanism is attached to the intermediate frame 12. In performing the driving control based on the detection of the provided rolling detection sensor 20 to perform the complex rolling control, a planting work unit is provided between the intermediate frame 12 and the planting work unit 3 through a rolling regulation mechanism. 3 is regulated at a predetermined angle B, and a limit switch 26 is connected to the motor 16 to connect the intermediate frame 1 to the motor 16.
2 automatically reaches a predetermined rolling angle A, the motor driving is automatically stopped. Since B is set smaller than B, the intermediate frame 12 reaches the limit detection angle A before the relative rolling angle between the intermediate frame 12 and the planting work section 3 reaches the restriction angle B of the rolling restriction mechanism. Therefore, it is possible to reliably prevent the rolling restricting mechanism for restricting the rotation of the planting work section 3 from restricting the rolling of the intermediate frame 12. As a result, the intermediate frame 12 cannot reach the limit detection angle A. , The motor 16 does not continue to be driven, so that the overload of the motor 16 and the distortion of each part due to the motor driving force can be reliably prevented.

Moreover, since the amount of forced rolling of the intermediate frame 12 can be reduced, the length of the rack 19 and the like can be shortened and the forced rolling mechanism can be made compact. 3 can greatly contribute to reduction in size and weight.

Further, the contact piece 23 on the intermediate frame 12 side
Since the rolling angle C at which b contacts the limit switch main body 26a is set to be larger than the rolling restriction angle B of the planting work section 3, if the motor 16 continues to be driven based on the failure of the limit switch 26, etc. Before the frame 12 comes into contact with the limit switch main body 26a, the frame 12 is subjected to the restricting action of the rolling restricting mechanism. As a result, the inconvenience of damaging the limit switch 26 based on the contact with the intermediate frame 12 is reliably prevented. it can.

[0019]

In summary, since the present invention is constructed as described above, an intermediate member which can be rolled with respect to the holder member and the working portion is provided, and a rolling elastic machine is provided between the intermediate member and the working portion. On the other hand, a composite rolling control is performed by interposing a forced rolling control mechanism between the intermediate member and the holder member, but a rolling restriction mechanism of the working unit and a limit stop mechanism of the intermediate member are provided. In providing the limit stop angle of the intermediate member,
The intermediate member reaches the limit stop angle before the relative rolling angle between the intermediate member and the operating portion reaches the restriction angle of the rolling restriction mechanism because the rolling restriction angle is set to be substantially the same as or smaller than the rolling restriction angle of the working portion.
Therefore, it is possible to reliably prevent the rolling regulation mechanism, which should originally regulate the rolling of the working unit, from regulating the rolling of the intermediate member, and as a result, the intermediate member cannot reach the limit stop angle. As a result, it is possible to reliably prevent the actuator from continuing to be driven, and to eliminate all inconveniences such as applying an overload to the actuator and causing distortion in each part based on the driving force of the actuator.

Further, the limit detection angle of the intermediate member is set to be substantially the same as or smaller than the rolling restriction angle of the working section, and the rolling angle at which the intermediate member contacts the limit switch body is set to be smaller than the rolling restriction angle of the working section. When the actuator is set to a large value, even if the actuator continues to be driven based on the failure of the provisional limit switch, the intermediate member is subject to the restricting action of the rolling restricting mechanism before contacting the limit switch body. In addition, the inconvenience of damaging the limit switch based on the contact with the intermediate member can be reliably prevented.

[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 an essential part for explaining the operation.

[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 12 Intermediate frame 14 First rolling elastic machine 15 Second rolling elastic machine 16 Motor 19 Rack 20 Rolling detection sensor 21 Restriction pin 22 Regulator plate 26 Limit switch

Continuation of the front page (56) References JP-A-5-49318 (JP, A) JP-A-58-115916 (JP, U) JP-A-58-135215 (JP, U) JP-A-62-60112 (JP) , U)

Claims (2)

(57) [Claims] A holder member connected to the traveling body side;
An intermediate member that can be rolled with respect to the holder member and the working part is provided between the working part supported by the holder member via a rolling support shaft, and a working part is provided between the intermediate member and the working part. A rolling elastic device for controlling rolling is interposed, and a forced rolling control mechanism for forcibly controlling the rolling of the intermediate member based on the actuator drive is provided between the intermediate member and the holder member. In the traveling vehicle, a rolling regulation mechanism that regulates the rolling of the working unit with respect to the intermediate member at a predetermined angle is interposed between the intermediate member and the working unit, while the rolling of the intermediate member with respect to the holder member is set at a predetermined angle. provided Rimitsuto stop mechanism for restricting the Rimitsuto stop angle with respect to the holder member of the intermediate member, the rolling regulating angle with respect to the intermediate member of the working unit Working portion of the rolling control apparatus in a working vehicle, characterized in that set substantially equal to or smaller than the. 2. A holder member connected to the traveling body side,
An intermediate member that can be rolled with respect to the holder member and the working section is provided between the working section supported by the holder member via a rolling support shaft, and a working section is provided between the intermediate member and the working section. While the rolling ammunition that controls the rolling in a driven manner is interposed, between the intermediate member and the holder member,
In a traveling vehicle provided with a forced rolling control mechanism for forcibly controlling the rolling of an intermediate member based on an actuator drive, rolling of the working unit with respect to the intermediate member is performed between the intermediate member and the working unit. While a rolling regulating mechanism that regulates by an angle is interposed, the forced rolling control mechanism includes a limit switch that detects that the intermediate member has rolled to the holder member by a predetermined angle and stops the actuator driving, The limit detection angle of the intermediate member is set to be substantially the same as or smaller than the rolling restriction angle of the working unit, and the rolling angle at which the intermediate member contacts the limit switch body is set to be larger than the rolling restriction angle of the working unit. Rolling control of a working unit in a working vehicle Apparatus.