JPH0246248Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention aims to balance the weight of a seedling planting device, which is unbalanced in terms of left and right sides, by using the tension force of a spring, and to perform appropriate rolling control of the seedling planting device on the field surface. Specifically, a seedling planting device is connected to the rear end of an elevating link mechanism installed at the rear of the traveling vehicle body in a rolling manner, and the seedling planting device is detached left and right with respect to the rolling fulcrum of the seedling planting device. The present invention relates to a rice transplanter in which springs are stretched across the lifting link mechanism and the lifting link mechanism to bias the seedling planting device to a rolling neutral position.

In a conventional rice transplanter of this kind, in order to restore the seedling planting device to the rolling neutral position, the lifting link mechanism and a point separated from the rolling fulcrum of the seedling planting device by the same distance to the left and right are connected. During this period, two types of springs were stretched, each having a different tensile force depending on the left and right weight balance. Therefore, since springs with different specifications are required, manufacturing costs rise, and when the springs are assembled, even if the springs have different specifications, they are similar in shape and size. Since it is a standard product, it has the disadvantage of being installed incorrectly.

In view of these circumstances, the present invention has an object to provide a device that can eliminate the conventional drawbacks by making simple modifications.

The characteristic configuration of the rice transplanter according to the present invention, which has been made to achieve the above object, is that a spring receiving arm for connecting and supporting both springs is mounted horizontally on the seedling planting device, and both springs are configured to have the same specifications. , the distance between the rolling fulcrum and the spring connection points at both ends of the spring receiving arm is formed to be different in advance according to the left-right weight balance of the seedling planting device, and the spring receiving arm is provided with a seedling planting device. When the seedling planting device is at a predetermined lifting position that is out of the planting work level, a rolling lock abutting member that comes into contact with the left and right lower links of the lifting link mechanism to fix the seedling planting device in a horizontal position is attached to the spring receiving arm. The point is that it is fixedly installed so that it protrudes forward.

The effects of the present invention having such a characteristic configuration are as follows.

In other words, the method for restoring and biasing the seedling planting device to the rolling neutral posture is similar to the conventional method in that it utilizes the difference in the tension force of the springs, but there is a method for expressing the difference in the tension force of the springs. In this case, the distance from the spring connection points at both ends of the spring receiving arm to the rolling fulcrum is varied depending on the left and right weight balance of the seedling planting device, so that the length of the spring attached to the seedling planting device is varied. Therefore, the springs can be configured to have the same specifications, and unlike conventional configurations, the cost does not increase. Moreover,
A rolling lock abutting member for the seedling planting device is fixed to the spring receiving arm in such a manner that it protrudes forward with respect to the spring receiving arm.
Utilizing its protruding position, when attaching the spring receiving arm, it is possible to attach it without having to mix up the left and right arms, thereby improving work efficiency.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 to 4, front and rear wheels 1,
2 and a control section 3, one top link 4A and a pair of left and right lower links 4B, 4 are provided at the rear of the vehicle A, which is equipped with a top link 4A that can swing up and down using its front end as a fulcrum.
B and both of these links 4A and 4B, 4B
The vertical link 4C is pivotally connected between the top link 4 and the vertical link 4C.
Hydraulic cylinder 9 installed between A and the traveling vehicle body A
At the same time, a rolling support shaft 5 in a longitudinal direction is rotatably supported at the lower end of the vertical link 4C. A seedling planting device B equipped with three ground floats 6, 6, 6', a seedling stand 7, and six sets of planting mechanisms 8 is connected in series to form a riding-type rice transplanter for 6-row planting. do.

To explain the seedling planting device B in detail, a transmission case 8A to the planting mechanism 8 is connected to the rear end of the rolling spindle 5 in a horizontal position, and uprights are attached to both ends of the transmission case 8A. Installation frame 15, 15
The seedling stand 7 is supported so as to be slidable in the left-right direction via a guide frame 19 horizontally fixed to the transmission case 8A. The sliding mechanism of the seedling stand 7 includes a horizontal feed shaft 18 that is reciprocated with a constant left and right stroke by a screw feeding means in the transmission case 8A, and this shaft 1.
8, the arm 1 extends from the seedling stand 7.
6 are connected and fixed. Further, springs 10, 10 are stretched between the vertical link 4C and the left and right parts of the seedling stand 7, so that when the seedling stand 7 moves laterally, the seedling planting device A It is configured to correct the left and right weight balance. As shown in FIG. 4, a cylindrical boss 4D is fixed to the lower end of the vertical link 4C in a front-back position, and to this cylindrical boss 4D,
The rolling support shaft 5 is supported by a bearing so as to be swingable around the axis of the cylindrical boss 4D, and the transmission case 8A is connected and supported at the rear end of the support shaft 5, thereby connecting the seedling planting device B. is configured to freely swing around the support shaft 5 and follow the surface of the field. A plate-shaped spring receiving arm 11 is horizontally mounted to the support shaft 5 at the front end of the cylinder boss 4D via an intermediate member 12. The support shaft 5 and the intermediate member 12 are connected to be integrally swingable, and the intermediate member 12 and the arm 11 are slidable relative to each other through a large diameter hole 12a formed in the intermediate member 12. It is connected and configured. Further, bolts 12b, 12b are fixedly attached to both ends of the intermediate member 12. Then, spring connection points 11a, 11a are provided at both ends of this spring receiving arm 11, and this connection point 11
A spring 1 is installed between a, 11a and the vertical link 4C.
3 and 13 respectively. Both springs 13, 13
are of the same specifications, and the spring connection points 11a, 1
The distances x and x' between 1a and the rolling fulcrum P are set to be different in advance according to the left-right weight balance of the seedling planting device B, so that the seedling planting device B is biased to return to the rolling neutral posture. be.

A rolling lock abutting member 11c is fixed to the spring receiving arm 11 through the pipe frames 11b, 11b in a posture protruding forward with respect to the spring receiving arm 11. When the lower links 4B are in the imaginary line position, that is, when the seedling planting device B is at the lower limit position below the planting work level, it comes into contact with the left and right lower links 4B, 4B. By holding the seedling planting device B in a horizontal position and preventing it from rolling, it is possible to prevent damage caused by a collision between the seedling platform 7 and the rear wheel 2 or a collision between the ground float 6 and the floor surface.

Stopper bolts 1 are provided on the lower surface of each lower link 4B at both left and right ends of the intermediate member 12.
A flat member 17 that can come into contact with 2b, 12b is fixed, and when the seedling planting device B is raised to a predetermined upper limit position for driving on the road, etc.
The seedling planting device B is brought into contact with the left and right stopper bolts 12b, 12 and the left and right flat members 17, 17.
rolling is becoming regulated.

The control valve of the hydraulic cylinder 9 is linked to a central float 6', and when the float 6' moves up and down depending on the depth of the tiller, the control valve of the hydraulic cylinder 9 operates the link mechanism 4 in accordance with the up and down movement of the float 6'. The seedling planting device B is controlled to move up and down in the same direction as the float 6', so that the seedling planting device B is always maintained at a constant level with respect to the rice field.

Suspension springs 14, 14 are connected to the tip of the piston rod of the hydraulic cylinder 9,
A fork end-shaped member 9A is attached to the piston rod so as to be slidable in the rod axial direction, and a bracket 4 having a U-shaped cross section extending from the top link 4A is installed inside the fork end.
Pins 4b, 4b protruding outward on both sides of a
Engagement grooves 9a, 9a and 9a, 9 that can be freely engaged and disengaged with
A are arranged in two places in parallel in the axial direction of the piston rod. Therefore, by changing the engagement of the engagement grooves 9a and 9a with the pin 4b, the lifting start position can be changed up and down without changing the lifting range of the lifting link mechanism 4, and the fertilizer application device When attached to the seedling planting device B, the lifting start position, which has been moved downward by the weight thereof, can be pulled up to its original state.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged side view of the main parts showing the planting device, and Fig. 3 is an enlarged front view of the main parts showing the planting device. 4 is an exploded perspective view of the rolling fulcrum part, FIG. 5 is an enlarged side view of a partially cutaway essential part of the elevating link mechanism, and FIG. 6 is an enlarged sectional bottom view of the essential part of FIG. 5. A... Traveling vehicle body, B... Seedling planting device, P... Rolling fulcrum, x, x'... Distance, 4... Lifting link mechanism, 4B... Left and right lower link, 11... Spring receiving arm, 11a ...Spring connection point, 11c...
...Abutting member for rolling lock, 13...Spring.

Claims (1)

[Scope of utility model registration request] Lifting link mechanism 4 installed at the rear of the traveling vehicle body A
A seedling planting device B is connected to the rear end of the seedling planting device B in a rolling manner, and springs 13, 13 are connected to the lifting link mechanism 4 and the portions of the seedling planting device B that are off to the left and right with respect to the rolling fulcrum P. Stretch each
The rice transplanter is a rice transplanter in which the seedling planting device B is restored to a rolling neutral posture, and a spring receiving arm 11 that connects and supports both springs 13 is horizontally mounted on the seedling planting device B. , both springs 1
The seedling planting device B
The spring receiving arm 11 is formed so as to be different in advance depending on the left and right weight balance of the A rice transplanter in which a rolling lock abutment member 11c that abuts the left and right lower links 4B, 4B and fixes the seedling planting device B in a horizontal position is fixed in a position that projects forward relative to the spring receiving arm 11. Machine.