JP3090846B2 - Rolling regulation mechanism for working part 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 mechanism for restricting rolling of a working part in a working vehicle such as a riding rice transplanter.

[0002]

2. Description of the Related Art In general,
In this type of traveling vehicle, a working unit connected to a traveling body via an elevating link mechanism is configured to be freely rollable, and the rolling posture is controlled to a constant posture using a rolling elastic machine or the like. There is something. In such a case, it is desirable to set the allowable rolling amount of the working unit as large as possible in order to cope with a field having large irregularities. However, the working unit is
Since the separation distance from the traveling body changes according to the elevating operation of the elevating link mechanism, it is necessary to set the rolling allowance based on the lower limit position closest to the traveling body. In other words, in the vicinity of the lower limit position close to the traveling body, the working portion easily interferes with the body-side member (the rear wheel or the like) as the rolling is performed, so that a large allowable rolling amount of the working portion cannot be ensured. .

[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 mechanism for restricting rolling of a working portion in a working vehicle that can eliminate these drawbacks. a is, the working unit connected to the traveling machine body via a lifting link mechanism, the left and right contradiction manner
A work vehicle configured to be freely rollable via a rolling elastic machine that expands and contracts when the working part height is equal to or higher than a predetermined height. work
Control the rolling amount of the part not to exceed the specified angle.
And a recess into which the stopper pin is loosely fitted
A first rolling regulating mechanism comprising: a working unit having a smaller rolling amount than the first rolling regulating mechanism when the working unit height falls below the predetermined height;
By providing a second rolling restricting mechanism for restricting as a have a range is characterized in. In addition, the
The rolling restriction amount of the second rolling restriction mechanism is set so as to increase as the working unit height decreases. Further, in configuring the second rolling regulation mechanism using a regulation plate interposed between the lifting link mechanism and the working unit, the regulation plate projects downward from the lifting link mechanism side and extends toward the working unit side. And is characterized by being engaged with. According to the present invention, with this configuration, it is possible to secure the rolling allowance of the working unit as large as possible, and to improve the performance of the rolling control.

[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 detachably connected to the rear end of the lifting link mechanism 2 and has a boss 4a integrally provided at the lower end thereof. A rolling support shaft 5 rotatably supported by a boss portion 4a via a bearing, is integrally connected to a rear end of the rolling support shaft 5, and has a seedling support stand 6a standing on both left and right sides. A working unit frame 6 provided, a planter case 7 integrally assembled to the working unit frame 6, a planter arm 8 juxtaposed to the planter case 7, an upper end of the seedling table support stay 6a, and a planter case 7
The seedling table 9 and the bottom of the planter case 7 are supported at the upper end by a slide piece S so as to be able to reciprocate left and right via a slide piece S and are forcibly fed laterally in synchronization with the scraping timing of the planter arm 8. And a float 10 provided at a predetermined interval in the left-right direction. That is, the planting work section 3 is supported by the holder frame 4 connected to the traveling machine body 1 via the lifting link mechanism 2 so as to be freely rollable via the rolling support shaft 5, but the above basic configuration is as follows. All are the same as before.

The lifting link mechanism 2 includes a single upper link 2a, a pair of lower links 2b on the left and right,
The so-called three-point link mechanism is provided with a link holder (not shown) for connecting the rear end portions a and 2b.
When the link holder is integrally connected to the holder frame 4, the linking holder is vertically swung based on expansion and contraction of a lift cylinder (not shown) connected to the upper link 2a or the lower link 2b. 3 is raised and lowered.

Reference numeral 12 denotes an intermediate frame provided between the holder frame 4 and the planting section 3, and a boss portion integrally formed at the lower end of the intermediate frame 12 in the front-rear direction. Reference numeral 12a is rotatably fitted to the boss portion 4a of the holder frame 4 and is externally supported. That is, the intermediate frame 4
Can be relatively rolled relative to the holder frame 4 and the planting work section 3, and its rolling fulcrum coincides with the rolling fulcrum of the planting work 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 back 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.

Reference numeral 13 denotes a rolling ammunition composed of a pair of left and right coil ammunition. The rolling ammunition 13 is provided between the T-shaped frame portion 12c of the intermediate frame 12 and the left and right end portions of the seedling mounting table 9. It is interposed in a C-shape. That is, the left and right rolling ammunition 13 expand and contract reciprocally with the lateral feeding of the seedling mounting table 9 to balance the eccentric load of the seedling mounting table 9, and based on this balance action, accompany the seedling mounting table lateral feeding. The rolling of the planting work section 3 is regulated.

Reference numeral 14 denotes a balance ammunition composed of a pair of right and left coil ammunitions. The urging force is set so as to balance the entire load of the planting work section 3. That is, the so-called driven rolling control in which the planting work unit 3 is held by the rolling ammunition 13 and the balance ammunition 14 to allow the planting work unit 3 to follow the paddy field based on the buoyancy of the float 10. However, the rolling ammunition 13 that balances the unbalanced load accompanying the lateral feeding of the seedling mounting table 9 and the balancing ammunition 14 that balances the entire load of the planting work section 3 are separately provided.
It is possible to simplify the setting of the urging force of each of the armatures 13 and 14, and to set the optimum urging force corresponding to the load to be balanced.

The balance armature 14 is provided between an armature bracket 15 projecting laterally from an intermediate portion of the intermediate frame 12 and an armature bracket 16 projecting forward from both left and right sides of the working frame 6. The arranging direction is set to a direction orthogonal to the boss portion 12a of the intermediate frame 12 in a side view, so that the urging force of the balance elastic machine 14 causes a moment to act on the intermediate frame 12. Can be avoided.

Reference numeral 17 denotes a motor having a speed reduction mechanism provided at a side position of the holder frame 4 via a base 18. The pinion gear 1 outputs a driving force of the motor 17.
The large-diameter gear portion 19a of the intermediate gear 19 meshes with the small-diameter gear portion 7a. The small-diameter gear portion 19b, which rotates integrally with the large-diameter gear portion 19a, is mounted on a rack 20 projecting laterally from the intermediate frame 12. Meshing from above. That is, a forced rolling control mechanism for forcibly rolling the intermediate frame 12 in the left-right direction based on the driving of the motor 17 is configured between the holder frame 4 and the intermediate frame 12. Is a seedling table support stay 6a in front,
It is set in a substantially triangular space in side view surrounded by the rear seedling table 9 and the lower planter case 7, so that the forced rolling control mechanism can be effectively protected from water, mud, obstacles and the like. It has become.

The base 18 is formed with a screw hole 18a for screwing the motor 17, a shaft through hole 18b for penetrating the motor shaft, and the like. A gear mounting hole 18c for rotatably mounting the gear 19 is formed. That is, since the motor 17 and the intermediate gear 19 are pre-assembled on the base 18, the adjustment of the depth of engagement (backlash adjustment) between the pinion gear 17a and the intermediate gear 19 is automatically performed in the dimension control stage during the drilling. Is being done.

Further, a mounting piece 18e having a pair of upper and lower mounting holes 18d is formed on one side edge of the base 18 in a bent manner. Then, the base 18 is integrally attached to the side surface of the holder frame 4 by tightening the bolt 21 and the nut 21a inserted through the attachment hole 18e and the attachment hole 4b on the holder frame 4 side. The hole 18d is formed as a long hole that is long in the vertical direction. Therefore, when the bolt 21 is loosened, the engagement depth between the intermediate gear 19 and the rack 20 can be adjusted by sliding the base 18 up and down. It has become.

Reference numeral 22 denotes a cover body to be assembled to the base 18. The cover body 22 includes a cover body 22a that covers the front, rear, outside, and below the base 18, and an upper opening of the cover body 22a. And an upper cover 22b which is provided detachably on the main body. And cover body 2
2 covers a forced rolling control mechanism composed of a motor 17, an intermediate gear 19 and a rack 20 to protect these components from water, mud, obstacles and the like. The upper opening can be opened and closed based on the attachment and detachment of the upper cover 22b.

The rack 20 is formed in an arc shape centered on a rolling fulcrum of the intermediate frame 12 and has a meshing tooth 20a formed on its outer peripheral side to secure a meshing range with the intermediate gear 20. However, at the both ends of the meshing range, the cut-up portions 20b having no meshing teeth
Are formed respectively. Therefore, when the meshing position of the intermediate gear 19 reaches the raised portion 20b, meshing with the intermediate gear 19 is refused, and the further forced rolling operation of the intermediate frame 12 is mechanically restricted. .

Reference numeral 23 denotes a pendulum type rolling detection sensor provided on the rear surface of the intermediate frame 12 via a sensor bracket 23a.
The rolling detection value of No. 3 is input to a control unit (not shown). Then, the control unit controls the motor 17 to drive the motor 17 forward and reverse so that the input rolling detection value matches a predetermined set value (horizontal set value or tilt set value).
2 is forcibly controlled in a fixed posture (horizontal control or tilt control).

Reference numeral 24 denotes a stopper pin projecting rearward from the intermediate frame 12, and the stopper pin 24
Is loosely fitted into the concave portion 25a of the stopper plate 25 provided integrally with the planter case 7, and constitutes a rolling regulating mechanism of the planting work section 3. That is, if the relative rolling angle of the planting operation unit 3 with respect to the intermediate frame 12 is within a predetermined angle, the stopper pin 24 allows the planting operation unit 3 to roll. If the relative rolling angle reaches a predetermined angle is adapted to restrict further rolling of the left and right ends abutment to planting working portion 3 of the recess 25a, this way First rolling regulation of the present invention
A mechanism is configured .

Reference numeral 26 denotes a T-shaped frame 1 of the intermediate frame 12.
The lower end of the hanging bracket 26 slidably contacts the front surface of a guide plate 27 provided at the upper end of the holder frame 4. That is, a tilting control mechanism is provided which controls the backward tilting of the intermediate frame 12 which receives the urging force of the rolling bullet 13 based on the contact of the hanging bracket 26 with the guide plate 27.

Further, a pair of left and right cylindrical members 26a protrude from the hanging surface of the hanging bracket 26 on the guide plate contact surface, and a part of each cylindrical member 26a is exposed from the tip of the cylindrical member 26a to guide the guide. Ball 2 rollably abutting plate 27
8 are accommodated. That is, the sliding resistance between the hanging bracket 26 and the guide plate 27 accompanying the rolling of the intermediate frame 12 is minimized.

At the left and right ends of the guide plate 27, a pair of left and right bent pieces 27a facing each other across the lower end of the hanging bracket 26 are formed.
Each of the limit switches 7a is provided with a limit switch 29 that detects and operates based on contact with left and right contact pieces 26b formed on the hanging bracket 26. That is, the right and left limit switches 29 detect that the relative rolling angle of the intermediate frame 12 with respect to the holder frame 4 has reached a predetermined angle, and output the detection signal to the control unit to control the motor 17. Limit automatic stop is performed.

Reference numeral 30 denotes a pair of left and right stopper brackets provided at predetermined positions (left and right lower link 2b intervals) at the left and right positions of the working unit frame 6, and the stopper brackets 30 project forward and have projecting tips. In
Stopper bolts 31 facing the lower surfaces of the left and right lower links 2b are screwed up and down freely. That is, when the lifting link mechanism 2 is hydraulically actuated to raise the planting work section 3, the left and right lower links 2b abut on the left and right stopper bolts 31 at the substantially upper limit position. The working unit 3 is forcibly returned to the parallel posture, and the rolling with respect to the traveling body 1 is locked.

Reference numeral 32 denotes a pair of right and left regulating plates provided on each of the left and right lower links 2b so as to be able to swing back and forth. The regulating plates 32 include a scraping amount adjusting lever 50 provided around the lifting link mechanism 2, In order to avoid interference with the paste fertilizer supply pipe 51 and the like, the protrusion protrudes from the lower link 2b into an empty space below, but a restriction pin 33 protruding from a side surface of the stopper bracket 30 is formed in a long hole 32a formed in the restriction plate 32. Are loosely engaged. And, when the planting work section 3 is at the normal planting height, the regulating pin 33 is located in the middle of the long hole 32a,
Even if the provisional planting work section 3 rolls to the maximum extent within the allowable range of the stopper pin 24, it does not come into contact with the lower end of the long hole 32a, but the planting exceeds the predetermined height H1 which is lower than the normal planting height. When the working unit 3 is lowered, the lower link 2
b with the change in the relative angle between b and the planting work section 3
3 approaches the lower end of the slot 32a, and in this state,
The permissible dimension L (rolling permissible range) of the regulating pin 33 with respect to the elongated hole 32 a is smaller than the permissible range of the stopper pin 24. Rolling tolerance is regulated. Further, since the movement allowable dimension L becomes smaller as the planting work section 3 descends,
The rolling control amount increases as the vehicle descends from the predetermined height H1, and when the vehicle reaches the predetermined height H2 lower than the wheel contact surface height H0, only a slight rolling of the planting work unit 3 is allowed. It has become. In other words, the planting work section 3 approaches the rear wheel 1a as the vehicle body 1 descends as the vehicle body 1 descends due to the link characteristics of the lifting link mechanism 2, so that when the planting operation section 3 descends beyond the predetermined height H1, the rearward of the rear wheel 1a. May interfere with the rear wheel 1a as the planting work section 3 rolls. However, the float 10 and the rear wheel 1a may be in contact with each other based on the rolling regulation by the regulating pins 33 and the regulating plate 32. Interference is reliably avoided , and thus the second method of the present invention is performed.
A rolling regulation mechanism . L1 is the height H
The allowable movement dimension in the first state, L2 (<L1), is the allowable movement dimension in the height H2 state.

In the embodiment of the present invention constructed as described above, the regulating plate 32 interposed between the lifting link mechanism 2 and the working unit frame 6 is such that the planting work unit 3 is normally at the planting height. In some cases, it has no effect, but in an abnormal descending state in which the plant descends beyond the predetermined height H1 lower than the normal planting height, the rolling amount of the planting work section 3 is regulated based on the contact with the regulating pin 33. Will do. That is, even if the float 10 approaches the rear wheel 1a due to the abnormal lowering of the planting operation unit 3, it is possible to avoid the float 10 from interfering with the rear wheel 1a as the planting operation unit 3 rolls. Therefore, the rolling allowance of the planting work unit 3 is set to
Can be set as large as possible without considering the case of abnormally falling, and as a result, the range of the rolling control can be expanded and the performance of the rolling control can be improved.

Further, since the rolling restriction amount by the restriction plate 32 increases as the working height decreases, the rolling allowable amount is reduced as much as possible while avoiding interference with the traveling machine 1 even in the rolling restriction state. Therefore, even in the abnormal descending state, the rolling control can be made effective, and the working accuracy in Asada or the like can be improved.

Further, since the regulating plate 32 is disposed so as to protrude from the lower link 2b toward the lower empty space, the scraping amount adjusting lever 50 and the paste provided around the lifting link mechanism 2 are disposed. There is no fear of interfering with the fertilizer supply pipe 51, so that it is not necessary to make the regulating plate 32 a complicated shape in order to avoid interference,
The rolling restriction mechanism can be simplified and downsized.

Further, since the restriction pin 33, which is the engagement partner of the restriction plate 32, is provided on the stopper bracket 30 for restricting the rolling when the working part is raised, it is not necessary to provide a dedicated bracket.
As a result, the number of parts can be reduced and the structure can be simplified based on the dual use of the bracket.

[0026]

[Advantageous effects] In short, since the present invention is configured as narrative, but a working unit connected to the traveling machine body via a lifting linkage is obtained by rolling freely configured, the working unit is predetermined If you descend above the height ,
Small rolling amount of the working unit the second of rolling regulation mechanism
Since the provisional work section is lowered so as to approach the traveling machine body, interference between the working section and the traveling machine body due to rolling is avoided. Therefore,
Adjust the rolling allowance of the working unit so that the working unit is below the specified height.
It is possible to set as large as possible without taking into account the case where the vehicle has descended. As a result, the range of the rolling control can be expanded and the performance of the rolling control can be improved.

Further, when the rolling restriction amount of the second rolling restriction mechanism is set to be larger as the height of the working unit is lower, interference with the traveling machine body even in the provisional rolling restriction state. As a result, the rolling allowance can be as large as possible while avoiding the problem. As a result, even in a state where the working unit is lowered too much, the rolling control can be enabled to contribute to the improvement of the working accuracy.

Further, when the second rolling regulating mechanism is constituted by using a regulating plate interposed between the lifting link mechanism and the working section, the regulating plate is moved downward from the lifting link mechanism side. In the case where the regulating plate is configured to protrude and engage with the working unit side, the regulating plate can be disposed by utilizing an empty space existing below the elevating link mechanism. Therefore, the regulating plate is disposed so as to protrude upward. As in the case, it is not necessary to consider the interference with the members arranged around the lifting link mechanism, and as a result, it is not necessary to make the regulating plate a complicated shape to avoid the interference with the members. This can contribute to simplification and downsizing of the second rolling regulation mechanism.

[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 main part of a planting work section.

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

FIG. 4 is an enlarged plan view of a main part of the same.

FIG. 5 is a perspective view of a forced rolling control mechanism.

FIG. 6 is a front view showing the operation of a rolling restriction mechanism.

FIG. 7 is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Elevating link mechanism 3 Planting work part 4 Holder frame 5 Rolling spindle 6 Working part frame 6a Seedling support stand 9 Seedling stand 12 Intermediate frame 12a Boss part 13 Rolling ammunition 14 Balance elastic machine 17 Motor 18 Base 19 Intermediate gear 20 Rack 32 Regulatory plate 33 Regulatory pin

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-62-205710 (JP, A) JP-A-60-94026 (JP, U) JP-A-51-92408 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) A01C 11/02 320 A01C 11/02 311 A01B 63/10

Claims (3)

(57) [Claims] A work unit connected to a traveling body via an elevating link mechanism expands and contracts irreversibly and balances the work unit .
A working traveling vehicle configured to be freely rollable via a rolling ammunition , and the working traveling vehicle has a working section height.
When the height is more than the predetermined height, the rolling amount of the working
Stopper pin and the
A first row composed of a recess into which the stopper pin fits loosely
The ring regulating mechanism and the working part height exceeds the predetermined height
When descending , the rolling amount of the working unit is reduced by the first rolling .
A second rolling regulation mechanism that regulates the rolling section so as to be smaller than the rolling regulation mechanism. 2. The working vehicle according to claim 1, wherein the amount of rolling restriction of the second rolling restricting mechanism is set to increase as the height of the working unit decreases. Rolling regulation mechanism. 3. When the second rolling restricting mechanism according to claim 1 is configured using a restricting plate interposed between the lifting link mechanism and the working unit, the restricting plate includes:
A rolling restricting mechanism for a working unit in a working vehicle, wherein the working unit protrudes downward from the lifting link mechanism and engages with the working unit.