JP2543605Y2 - Right and left attitude control device of seedling plant in rice transplanter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic horizontal posture control device for maintaining a horizontal posture of a seedling plant in a rice transplanter for planting seedlings in a field.

[0002]

2. Description of the Related Art When planting seedlings in a field by a rice transplanter,
A seedling device is attached to the front or rear of the traveling body via a link mechanism so as to be able to rotate left and right and move up and down.
Planting mechanisms are provided at appropriate intervals on the left and right in the traveling direction, and the seedling mats on the seedling mounting table in the seedling plant are divided by the number of plants as appropriate by the planting mechanism that rotates up and down as the rice transplanter advances, and is planted in the field scene. Arranging to attach is well known.

[0003] Further, when correcting the right and left inclination posture of a seedling plant by an actuator, Japanese Patent Laid-Open Publication No. Hei 2-135015 discloses a method in which a lower end is provided at the rear of a link mechanism with an upper end of a swinging rod which is rotatably supported left and right. While connecting a pair of left and right tension springs to the upper ends of the columns that protrude forward from both left and right portions of the seedling planting device, the actuator also fixed to the link mechanism is connected to the longitudinal middle part of the swinging rod, It has been proposed that the swing rod be configured to be driven to rotate left and right.

[0004]

According to the above prior art, the pulling force of one tension spring increases while the swinging rod rotates left or right by actuation of the actuator, and the other pulls up. It is stated that the tension force of the tension spring is reduced, and the right and left contact pressures of the seedling plant are balanced to enable proper rolling posture control.

When the tension spring is mounted for a shorter interval than the so-called free length state in which the tension becomes zero, the axis of the tension spring is curved, and the tension spring is stretched. The force will act. Therefore, when the pair of left and right tension springs is mounted on both sides of the swinging rod disposed at the center in the left and right directions as in the prior art described above, the swinging rod is largely turned to one side. Then, when the distance from one of the columns is shorter than the free length of the tension spring, the tension spring mounted on that portion is caught and hinders the rotation of the swinging rod. As a result, the left and right balance cannot be obtained,
There was a problem that rolling control could not be stabilized.

Further, when the end of the tension spring is formed in a hook-like hook portion and locked in the mounting hole, there is a risk that the hook portion may come off from the mounting hole due to the above-mentioned reaction force. The purpose of the present invention is to solve the above technical problem.

[0007]

According to the present invention, a seedling plant is mounted on a traveling body so as to be vertically movable via a link mechanism. A rice transplanter configured so that a seedling plant is mounted to be rotatable left and right around a rolling axis provided in the vehicle, and control is performed to maintain the seedling plant in a horizontal posture by an actuator provided in a link mechanism. At least one end of a tension spring mounted between left and right ends of a left and right operating rod attached to the actuator and left and right portions of the seedling plant is connected via a rotatable mounting bracket.

[0008]

According to this structure, the interval between the actuating rod in the actuator and the tension spring between the seedling plant and the seedling plant is less than the free length of the tension spring. In this case, since the mounting bracket to which one end of the tension spring is attached rotates in the direction in which the tension spring escapes, the presence of the tension spring does not cause interference such that the tension force of the other tension spring is weakened. .
Therefore, rolling control can be stabilized.

Also, when the tension spring is too loose,
The accident that the extension spring comes off at the connection point is also eliminated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, an embodiment will be described. In FIG.
And front wheels 3, 3 attached to the front side thereof, and rear wheels 5, attached to the rear side via swinging cases 4, 4 which are vertically rotatable.
5, a control seat 6 and a control handle 7 are provided on the upper surface of the body frame 2, and the driving force of the engine 8 on the front upper surface of the body frame 2 is transmitted to a transmission mechanism in a power transmission unit case via a clutch. To drive and drive the rear wheels 5, while P
The seedling is transmitted to the seedling plant 10 via the TO shaft.

A parallel link mechanism 1 is provided at the rear of the traveling body 1.
The seedling transplanter 10 which can be vertically moved through the center 1 is mounted on a central transmission case 12 and on both left and right sides of the central transmission case 12 at appropriate intervals via a connecting pipe 12a having a transmission shaft inserted therein. Transmission cases 14, 14, 14; a float 10a below each planting transmission case 14; and a laterally reciprocally movable seedling mounting table 15 having an upper end inclined to approach the traveling body. At the rear left and right sides of the planting transmission case 14, a seedling outlet at the lower end of the seedling mounting table 15 and a field scene 17 are provided.
A seedling planting mechanism 16 is provided between which the planting claws move up and down.

The parallel link mechanism 11 is driven up and down by a hydraulic cylinder 13 on the traveling body 1 side. The parallel link mechanism 11 includes a top link 18 and a pair of left and right lower links 19, 19. The base end of the top link 18 is pivotally connected to a portal frame standing on the vehicle body frame 2. A portal 20 to which each tip of the lower link 19, 19 is attached is rotatably connected to a rolling shaft 22 of a hitch 21 in the seedling plant 10, and the seed planting device 10 has a float 10a on its lower surface. The configuration is such that the running body 1 can be turned up and down (rolling) right and left around the rolling shaft 22 so as to slide on a field scene (mud surface).

A rail 24 at the lower end of the rear surface of the seedling mounting table 15 is slidably fitted on the guide portions 23 projecting from the left and right planting transmission cases 14, 14, while an upper portion of the rear surface of the seedling mounting table 15 is slidable. The guide rail 25 is provided with the right and left planting transmission case 14,
Roller part 2 at the upper end of a pair of columns 26 protruding from 14
7 and 27 are slidably fitted respectively. An actuator 29 for rolling control is provided on a bracket 28 attached to the portal 20, and both left and right ends of a left and right operating rod 30 moving left and right by the actuator 29, and right and left sides of the seedling plant 10. Tension springs 32, 32 are mounted on the supporting pillars 31, 31 attached to the supporting pillars 26, 26 projecting from the front end, respectively.

The actuator 29 includes a drive motor 33 capable of rotating forward and reverse, such as an electric motor, a worm gear mechanism 35 for transmitting the power of the drive motor 33, a left and right longitudinal screw shaft 34, and a screw shaft 34. It consists of a left and right operating rod 30 attached to a threaded moving piece 36 for screwing and arranged in parallel with the axis of the screw shaft 34. The screw shaft 34 is rotatably supported by bearings 38 in a cylindrical case 37 attached to the bracket 28. The moving piece 36 is connected to the operating rod 30 at a position protruding outside from a left and right long insertion groove 39 formed on one side of the case 37.

As shown in FIGS. 4 and 7, a base end of a mounting bracket 41 is pivotally supported at the distal ends of the left and right auxiliary columns 31, 31 via stepped bolts 40, respectively. The end hooks 32a, 32a of the tension spring 32 are engaged with the mounting holes 41 of the mounting bracket 41 and the mounting holes 43 at both ends of the operating rod 30, and are mounted. In addition,
Each of the mounting brackets 41 is rotated 360 degrees around the stepped bolt 40.
It can rotate by degrees.

With this configuration, the front and rear wheels 3,5 of the rice transplanter
While running on the ground in contact with the plow of the field, the seedling planting apparatus 10 executes the seedling planting operation such that the float 10a on the lower surface slides on the mud surface. When the center of gravity of the seedling plant 10 tilts left and right due to the left and right steps in the tillage, an inclination sensor (not shown) attached to the seedling plant 10 causes the seedling plant 10 to move.
Is detected, for example, such that the left side of the traveling direction is downward. Upon receiving the detection signal, the screw shaft 34 is rotated at a predetermined speed in a predetermined direction via a drive motor 33 by a command signal of a control means such as a microcomputer. Thereby, the movable piece 36 screwed to the screw shaft 34 is moved to the right from the neutral position by an appropriate distance, and the operating rod 30 is moved rightward through this. Then, the tension force of the tension spring 32 mounted between the left supporting column 31 and the mounting bracket 41 increases, and the right tension spring 32
The pulling force of the seedling decreases, so that the seedling-planting device 10 rotates downward and to the right around the rolling shaft 22, and corrects the posture until it balances with the support force (ground pressure) of the left and right floats of the seedling-planting device 10 on the field. It is done. Seedling plant 1
When 0 is in the lower right state, rolling control can be performed by the reverse operation.

If the left and right inclination angles of the seedling-planting device 10 are large, for example, when the height of the tillage is large, one tension spring 32 is greatly pulled and the other tension spring 32 is completely loosened. Such a tension spring 32 on the loose side.
In this case, the distal end side of the rotatable mounting bracket 41 is automatically moved away from the auxiliary support column 31 so that the free length does not substantially change. 32a does not come off with respect to the mounting hole 43 at the end of the operating rod 30 and the mounting hole 42 of the mounting bracket 41, and the tension spring 32 may be used to hinder the rolling operation of the seedling plant. Disappears.

As another embodiment, a horizontal reciprocating hydraulic cylinder, which is an actuator, is fixed, and both ends of an operating rod of a piston rod movable left and right in the hydraulic cylinder and the pair of right and left columns 26, 26 are provided. Auxiliary support post 3
The tension springs 32, 32 may be mounted on the rotatable mounting brackets 41, 41 at the tips of the ends 1, 31, respectively. Further, the mounting bracket 41 may be rotatably mounted on the operating rod side.

Reference numeral 44 denotes a sensor for detecting the lateral deviation of the operating rod 30 from the center, and a fork 47 which is rotatably supported on a bracket 45 fixed to the operating rod 30 via a support shaft 46 in a lateral direction. An engagement pin 48 projecting from the case 37 so as to be able to engage and disengage with the open concave groove 47a of the fork piece 47;
A biasing spring 49 mounted between the fork 47 and the bracket 45 includes a limit switch 50.

As shown in FIG. 5, this biasing spring 49
It is connected to a pin 51 erected on the bracket 45 and a pin 52 erected at a position from one side of the fork 47. The biasing spring 49 changes and holds the rotation posture of the fork piece 47 when its axis (a straight line connecting the pins 51 and 52) exceeds a so-called fulcrum with respect to the support shaft 46 as described later. Can be done. That is, when the bifurcated piece 47 that moves left or right in response to the rotation of the screw shaft 34 is pressed by the position-fixed engaging pin 48 at the location of the open concave groove 47a and rotates, for example, the operating rod 30 When it moves from the center position (neutral position) to the right (in the direction of arrow A in FIG. 5), the engagement pin 48 hits the inner surface of the left portion 47b of the fork 47, and the fork 47 rotates counterclockwise. At this time, the axis of the biasing spring 49 is beyond the fulcrum with respect to the support shaft 46, and the biasing spring 49 maintains its rotational posture. The detection signal of the limit switch 50 abutting on the forked piece 47 indicates that the operating rod 30 has moved to the right from the neutral position (by correcting the posture so that the left side of the seedling plant 10 is raised in the traveling direction). ) Can be notified by an instruction lamp in the cockpit of the traveling aircraft 1.

The operation panel 5 near the steering handle 7
It is necessary to arrange various switches for work that cannot be installed at four places in the vicinity of the cockpit 6. On the other hand, as shown in FIGS. 1 and 2, the steps 55 and 55 on both the left and right sides of the control seat 6 in the traveling machine body 1 are places where the worker walks when adding the seedling mat to the seedling mounting table 15. Therefore, the switch box 56 provided with the switch on the outer surface of the traveling body 1 is fixed to a step 55 below the control seat 6 (a place hidden by the seat 6 in a plan view), so that the switch box 56 is formed. The switch is not obstructed by the operator's feet, and the switch operation is easy for the operator sitting on the control seat 6.

[Brief description of the drawings]

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

FIG. 2 is a plan view.

FIG. 3 is a side view of a main part of a connecting portion between the seedling plant and the traveling machine body.

FIG. 4 is a plan view as seen from arrows IV-IV in FIG. 3;

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

6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is an enlarged sectional view taken along the line VII-VII of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 3,5 Wheel 10 Seedling plant 15 Seedling table 16 Planting mechanism 11 Link mechanism 22 Rolling shaft 26 Prop 28 Bracket 29 Actuator 30 Operating rod 31 Auxiliary support 32 Tension spring 33 Drive motor 34 Screw shaft 36 Moving piece 40 Stepped bolt 41 Mounting bracket 42, 43 Mounting hole 46 Support shaft 47 Bifurcated piece 48 Engagement pin 49 Bias spring 50 Limit switch 55 Step platform 56 Switch box

Claims (1)

(57) [Scope of request for utility model registration] 1. A seedling plant is mounted on a traveling machine body via a link mechanism so as to be vertically movable, and the seedling plant device is rotatable left and right around a rolling axis provided between the link mechanism and the seedling plant. Attached to the rice planting machine configured to execute control to hold the seedling plant in the left-right horizontal posture by the actuator provided in the link mechanism, the left and right ends of the left and right operating rods attached to the actuator A right and left posture control device for a seedling plant in a rice transplanter, wherein at least one end of a tension spring mounted between right and left sides of the seedling plant is connected via a rotatable mounting bracket.