JP3195657B2 - Seed height detection mechanism for seedling planting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling planting apparatus having a potentiometer for detecting the vertical swinging amount of a ground float that swings up and down with respect to the body of the seedling planting apparatus based on fluctuations in the grounding pressure. The detection mechanism.

[0002]

2. Description of the Related Art Conventionally, in the above-described plant height detecting mechanism of a planting apparatus, as shown in, for example, JP-A-4-53402, the free end side of a ground float is suspended and supported via a refraction link. In addition, there has been a configuration in which the floating free end side and a detection arm of a potentiometer attached to the seedling plant main body are pivotally connected via a rod.

[0003]

However, in the above-mentioned conventional structure, no problem occurs when the ground float moves up and down within a normal operating range. For example, the front free end side of the ground float has a ridge. If the detection rod that links the float and the potentiometer interlocks, a strong force is applied in the longitudinal direction, and the detection rod may be bent or buckled. In the subsequent planting operation, there is a possibility that a detection value is different and the planting depth cannot be controlled to be constant. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to the present invention, there is provided a seedling planting apparatus for detecting the height of a ground,
The free end side of the ground float and the detection arm of the potentiometer are interlocked and connected via a first rod,
The present invention is characterized in that the vertical swing limit of the ground float is abutted by a restrictor provided on the seedling plant main body via a second rod pivotally connected to the ground float.

[0005]

Since the free end side of the ground float and the detection arm of the potentiometer are interlockingly connected via the first rod for detection, it is possible to accurately detect the vertical displacement caused by the ground pressure fluctuation of the leveling float. Meanwhile, since the vertical swing limit with respect to the seedling planting apparatus main body is configured to be abutted through another second rod, the swing limit of the grounding float is prevented in any of the vertical directions due to interference with an external object or the like. Even if an attempt is made to swing with a strong force, the contact can be restricted by the second rod, so that the vertical swing exceeding the swing limit can be prevented. Participation can be reliably prevented. In addition, since the first rod and the second rod are arranged substantially in parallel in the vertical direction, it is easy to set the contact restriction range of the second rod as close as possible to the detection detection range of the potentiometer.

[0006]

Therefore, while being able to accurately detect the vertical swing amount of the ground float accompanying the ground pressure fluctuation,
Since the range of mechanical vertical swing limit is performed by a dedicated rod separate from the detection system, adverse effects such as bending of the detection rod due to unreasonable external force can be prevented beforehand, and the height of the seedling planting device to the ground can be detected. It has become possible to always maintain high accuracy.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
1 shows a rice transplanter equipped with a seedling planting device. This seedling planting device is connected to the rear part of the traveling machine body by a lift cylinder 2 via a parallel four-link mechanism 1 so as to be able to move up and down freely. A planting mechanism 4 for taking out seedlings one by one and planting them in the field, a plurality of ground floats 5 and the like are supported by a seedling planting apparatus main body 6. More specifically, a square pipe-shaped main frame 7 is provided in the width direction, and a feed case 8 to which power is supplied from the traveling body side is connected and fixed to the main frame 7 at the center in the left and right directions, and a predetermined interval is provided. It is opened and a plurality of planting cases 9 are fixedly extended to the rear side of the main frame 7 in a cantilever manner, and the vertical plate frame 10 is fixed over the front surface of the feed case 8 and the front surface of the main frame 7 to plant seedlings. The planting device main body 6 is constituted, the planting mechanism 4 is attached to the rear part of each planting case 9, and is rotatably supported at the lower part of each planting case 9, and is rotated by the planting depth adjusting lever 11. A ground float 5 is pivotally supported at the free end of a support arm 12 which can be adjusted and fixed so as to be vertically swingable. Further, a raising and lowering control mechanism for maintaining the seedling planting device at a fixed height relative to the field scene is provided so that the seedling planting depth by the planting mechanism 4 is maintained substantially constant. That is, the vertical swing amount of the ground float 5 that swings up and down with respect to the seedling planting apparatus main body 6 based on the variation of the ground pressure is detected by the potentiometer PM, and the control device 13 determines the lift cylinder based on the detected value of the potentiometer PM. The second electromagnetic hydraulic control valve V is switched and controlled to maintain the seedling planting device at a predetermined height. Next, a height detecting mechanism using the potentiometer PM will be described.

As shown in FIGS. 2 and 3, the potentiometer PM is mounted and supported on a support plate 14.
Is connected to a bracket 15 fixed to the front side of the vertical plate frame 10 via a parallel quadruple link mechanism 16 so as to be movable up and down while maintaining a parallel posture. Then, one link 16a of the link mechanism 16 is extended to form a cutout recess 17, and a locking rod 18 extended from the seedling planting depth adjusting lever 11 is locked to the rear portion of the cutout 17 to plant the seedling. The potentiometer PM moves up and down in parallel with the depth adjustment operation, and the ground float 5 and the potentiometer P are moved regardless of the adjustment of the planting depth.
It is configured such that the relative attitude with respect to M is maintained constant.
Then, a bracket 19 bolted to the front upper surface of the grounding float 5 and a detection arm 20 of the potentiometer PM
Are linked via a detection rod 21 (an example of a first rod), and the vertical swing amount of the front part of the ground float 5 due to the ground pressure fluctuation caused by the unevenness of the field scene accompanying the machine running is directly measured by a potentiometer. It is configured to detect by PM. The length of the detection rod 21 can be finely adjusted by a screw adjustment mechanism 22. In addition, a traction rod 23 [an example of a second rod] pivotally connected to the ground float 5 is provided near the detection rod 21.
The vertical swing limit of the ground float 5 is restricted by the restricting tool 24 via 3. That is, as shown in FIG. 4, a restraining rod 23 pivotally connected at its lower end to a bracket 19 on the float side is vertically movably inserted from a restricting tool 24 fixedly extended from the vertical plate frame 10, and the A detection sensitivity adjusting coil spring 27 for changing the downward pressing force of the ground float 5 is externally fitted between a flange 26 positioned by a fixing pin 28 inserted through the fixing pin 28 and the restricting tool 24. Ground float 5 via restraint rod 23
Is configured to be urged downward. Incidentally, a plurality of insertion holes 29 through which the fixing pins 28 are inserted are formed vertically so that the spring biasing force can be changed and adjusted. The spring 2 is provided on the outer peripheral side of the coil spring 27.
A collar 30 shorter than the entire length of the collar 7 is externally fitted, and the upper swing limit of the ground float 5 is restricted by contact between the upper end of the collar 30 and the restrictor 24. A flange portion 31 is formed at the upper end of 23, and the lower limit of the swing of the ground float 5 is regulated by the contact between the flange portion 31 and the restricting tool 24. The collar 30 is set to have a length such that the coil spring 27 does not come into close contact even when the collar 30 is in contact with the regulating tool 24.

[Another Embodiment] The restraining rod 23 is mounted with the sensitivity adjusting spring 27 as shown in FIGS. Separately from the rod for use, a rotary boss 33 pivotally connected to the support plate 14 of the potentiometer PM so as to be rotatable about the horizontal axis is inserted through the upper and lower contact portions 34 and 35 of the boss 33. A separate rod may be provided so as to abut against 33a, 33b to regulate the vertical swing limit of the ground float 5. With this configuration, even if the potentiometer PM moves up and down in accordance with the planting depth adjustment of the seedling, the contact regulation adjustment range does not change, and the working length of the restraining rod 23 for each planting depth adjustment operation. There is no need to make adjustments.

[0010] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rice transplanter.

FIG. 2 is a side view of a height detection mechanism.

FIG. 3 is a front view of a height detection mechanism.

FIG. 4 is a cutaway side view of a rod linking portion.

FIG. 5 is a side view of a rod linking unit according to another embodiment.

FIG. 6 is a front view of a rod linking unit according to another embodiment.

[Explanation of symbols]

 Reference Signs List 5 ground float 6 seedling planting apparatus main body 20 detection arm 21 first rod 23 second rod 24 restrictor 27 spring PM potentiometer

Claims (2)

(57) [Claims] 1. A seedling planting device configured to detect a vertical swing amount of a ground float (5) that swings up and down with respect to a seedling planting device main body (6) based on a change in ground pressure by a potentiometer (PM). A height detection mechanism for the ground, wherein the free end side of the ground float (5) and the potentiometer (P
M) with the detection arm (20) via a first rod (21), and a main body (6) via a second rod (23) pivotally connected to the ground float (5). ), The height-of-ground detection mechanism of the seedling planting apparatus, which is configured to limit the vertical swing limit of the ground float (5) by the restricting tool (24) provided in the apparatus. 2. The height detecting mechanism according to claim 1, wherein a spring (27) for adjusting the detection sensitivity of the ground float (5) is mounted on the second rod (23).