JPH0463644B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention links the front end of a sensor float that swings up and down around a rear fulcrum with a hydraulic valve for controlling the elevation of a seedling planting device, and A rice planting device that can control the raising and lowering of a seedling planting device that maintains a constant distance between the front end of the sensor float and the reference position of the seedling planting device (for example, the outer wire attachment end of the release wire) based on the rocking displacement caused by ground pressure fluctuations. Regarding machines.

[Conventional technology]

In this type of rice transplanter, as shown in Fig. 3 of Japanese Utility Model Application Publication No. 57-97734, the mechanism for controlling the raising and lowering of the seedling planting device has conventionally been a sensor float that can swing up and down around the rear fulcrum. A bending link, which is an example of a link member, is pivotally supported on the front end bracket, and this bending link and a hydraulic valve for controlling the elevation of the seedling planting device are interlocked and connected by an inner wire of a release wire, and the bending link is extended from the planting case. The outer wire end of the release wire was attached to the support member.

[Problem that the invention seeks to solve]

However, since the outer wire attachment end is located further forward of the rear fulcrum of the sensor float than the inner wire attachment end, when the sensor float swings around the rear fulcrum due to ground pressure fluctuations, the bending link Therefore, the relative posture of the inner wire attachment end of the bending link with respect to the support member changes, and there is a possibility that the operation of the inner wire that slides relative to the outer wire end may not be performed properly. In other words, since the relative posture of the bending link with respect to the support member changes, the posture of the inner wire from the outer wire attachment end to the bending link attachment end changes with respect to the attachment posture of the outer wire, so the inner wire is bent at the outer wire attachment end. As a result, the relative friction between the outer wire and the inner wire becomes large, and the inner wire does not operate smoothly with respect to the outer wire, that is, the sensor float does not move up and down smoothly.

Furthermore, in the conventional structure described above, the downward biasing force at the front of the sensor float is configured to be changeable and adjustable using an operating tool (not shown). As a result, there was a problem that the seedling planting depth was different from the set value, and there was still room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sensor float that can be moved up and down smoothly and can be controlled to go up and down with high accuracy at all times depending on the work situation.

[Means for solving problems]

The characteristic configuration according to the present invention is that the link member is pivoted to the front end bracket of the sensor float which is pivotably supported to be vertically swingable around the rear fulcrum with respect to the seedling planting device and is biased in the downward direction. A hydraulic valve for controlling the elevation of the planting device and the link member are interlocked and connected by an inner wire of a release wire, and
The outer wire end of the release wire is attached to a support member extending from the seedling planting device, and the reference interval between the inner wire attachment end and the outer wire attachment end is kept constant based on the vertical swinging movement caused by ground pressure fluctuations of the sensor float. The seedling planting device is configured to control the elevation and descent, and the inner wire attachment end and the outer wire attachment end are located on or near the same circumference centered on the rear fulcrum, and the front end bracket is placed in muddy soil. A mud hardness detection piece is installed that plunges into the field and detects the mud hardness of the field, and automatically adjusts the downward biasing force of the sensor float according to the detection result. The feature is that the distance between the parts can be freely changed and adjusted, and its effects are as follows.

[Effect]

In other words, focusing on the point where the front part of the sensor float vertically swings around the rear fulcrum, the inner wire attachment end and the outer wire attachment end are positioned on or near the same circumference around the rear fulcrum. In particular, even if the inner wire mounting end slides relative to the outer wire mounting end due to vertical swinging of the sensor float, the distance between the inner wire located within the outer wire and the outer wire mounting end to the mounting end on the link member is Changes in relative posture with the inner wire are suppressed to the extent that they are located on the same circumference, and the relative friction between the outer wire attachment end and the inner wire is always constant. The amount of plunge of the hardness detection piece into the soil changes depending on the difference in mud hardness, and the downward biasing force of the sensor float is automatically changed and adjusted accordingly, so the biasing force is always appropriate. When the machine is running at a high speed, or when there are large changes in the hardness and softness of the mud in the field, the sensing sensitivity can be increased by reducing the distance between the active part and the base end of the detection piece. If the traveling speed of the machine is slow, or if there are small changes in the hardness or softness of the mud in the field, increase the distance between the active part and the base end of the detection piece to sharpen the sensing sensitivity. Can be changed and adjusted.

〔Effect of the invention〕

Therefore, since the inner wire slides smoothly relative to the outer wire, the sensor float can also swing up and down smoothly, and the raising and lowering of the seedling planting device can be controlled more reliably and smoothly. Furthermore, by automatically adjusting the downward biasing force of the sensor float according to the difference in hardness and softness of the mud in the field, it is possible to always obtain appropriate sensing sensitivity, and the detection sensitivity itself of mud hardness detection can be adjusted depending on the work situation. We have now been able to provide a device that can be changed and adjusted accordingly, and allows for more accurate elevation control.

〔Example〕

As shown in Figure 4, engine 1 is installed at the front of the aircraft.
A seedling planting device 8 consisting of a seedling platform 4, a seedling planting mechanism 5, a planting case 6, and a group of 7 ground floats is attached to the rear end of the fuselage on which the transmission case 2 and the control section 3 are mounted. The rice transplanter is constructed by interlocking and connecting the rice transplanters so that they can be driven up and down.

Elevation control of the seedling planting device 8 will be described in detail. As shown in FIG. 1, a connecting arm 11 is protruded and fixed to a horizontal support shaft 10 which is rotatably supported around its own axis with respect to the planting case 6 so as to be able to rotate integrally therewith, and this connecting arm 11 and the rear end bracket 12 of the sensor float 7A located at the center of the group of grounding floats 7 are interlocked so as to be relatively swingable, and the connection axis X between the bracket 12 and the free end of the connecting arm 11 The sensor float 7A is pivoted about the rear fulcrum X as a rear fulcrum in order to be able to swing up and down to operate the sensor. A scale-type swinging arm 14, which is an example of a link member and is capable of vertically swinging, is pivotally supported on the front end bracket 13 of the sensor float 7A, and the inner wire 17a of the release wire 17 is linked to the front end of the swinging arm 14. is,
This inner wire 17a is a control valve 16 provided for a hydraulic cylinder 15, which is an example of an elevating mechanism that drives an elevating link mechanism 9 for a seedling planting device 8.
is linked to. More specifically, the inner wire 17a is operatively connected to a bracket 19 fixed to an operating shaft 18 that operates the spool 16a of the control valve 16 in forward and reverse directions. or,
A compression spring 20, which is an example of a biasing mechanism for swinging and biasing the sensor float 7A downward, acts on the rear end of the scale-type swinging arm 14. As shown in FIGS. 1 to 3, the compression spring 20 mounting structure will be described in detail. A member 23A, which is approximately U-shaped in plan view, is attached to the front-rear shaft 21 extending forward from the fuselage frame. The U-shaped member 23A is loosely fitted so as to be swingable up and down around the longitudinal axis, and the U-shaped member 23A is loosely fitted so as to be swingable up and down around the longitudinal axis.
The swinging metal fitting 23 is constructed by fixing the U-shaped member 23B in a state where the web surfaces abut against each other. A U-shaped upper spring receiving member 24 is connected to the U-shaped member 23B so that the U-shaped upper spring receiving member 24, whose web surfaces are perpendicular to each other, can swing relative to each other around the horizontal axis Y. An angled bracket 31 is fixed to one flange surface of the upper spring receiving member 24, and a support member 3 provided with a notch 32A for inserting and removing the inner wire is attached to the extending bracket 31.
2 is removably provided and constitutes the outer wire attachment end a. On the other hand, a connecting rod 25 connected to the rear end of the scale-type swinging arm 14 so as to be relatively swingable is made to pass through the upper spring receiving member 24 and protrude upward, and a pipe-shaped bottom is attached to the connecting rod 25. A spring receiving member 26 is fitted externally and penetrated through the upper spring receiving member 24. A connecting rod 25 is connected between these upper and lower spring receiving members 24 and 26.
The compression spring 20 is attached in a state where it is fitted onto the outside. The upper end portions of the connecting rod 25 and the lower spring receiving member 26 are screwed together, and the lower spring receiving member 26 is rotated and screwed, so that the connecting rod 2
By adjusting the installation interval of the upper and lower spring receiving members 24 and 26 by relative sliding movement with respect to 5,
The biasing force of the compression spring 20 can be varied.

Therefore, the biasing force of the compression spring 20 serves as a biasing force that biases the sensor float 7A downward, and by adjusting the biasing force, the sensitivity of the sensor float 7A can be adjusted.
From the above configuration, the inner wire 17a switches the valve spool 16a by the vertical movement of the front end of the sensor float 7A, which swings vertically due to ground pressure fluctuations against the biasing force of the compression spring 20. , is configured as a means for controlling the raising and lowering of the seedling planting device 8 so that the distance between the end of the outer wire 17b and the front end of the scale-type swinging arm 14 is constant on the lateral side of the U-shaped member 23B.

As shown in FIGS. 1 to 3, the planting depth adjustment mechanism will be described in detail. A planting adjustment lever 27 is fixed to a horizontal support shaft 10 that is pivotally supported on the planting case 6, and a holder 28 that can swing integrally with this planting adjustment lever 27 is provided.
A protrusion 29 that engages with the U-shaped member 23B from
is provided protrudingly, and by swinging the planting adjustment lever 27, the swinging metal fitting 23 is swung around the axis of the longitudinal axis 21, so that the front end of the sensor float 7A is moved up and down by the same amount as the rear end. It is set as.

As shown in FIG. 1, the sensor float 7A
A base end 30A of a mud hardness detection piece 30 is fixed to the center of swing of a scale-type swing arm 14 which is pivotally supported on a front end bracket 13 of the mud hardness detection piece 30. Mud hardness detection piece 30
The operating part 30B connected to the base end part 30A plunges into the mud, and swings up and down against the biasing force of the compression spring 20 due to the ground resistance caused by the running of the machine, thereby reducing the hardness and softness of the field. It is configured with a detection mechanism. The mud hardness detection piece 30 is fixed to the scale-type swinging arm 14, and the harder the field becomes, the more it swings upward and the more the compression spring 2
The sensing sensitivity of the sensor float is varied depending on the hardness and softness of the field so that the downward biasing force of the sensor float 7 is increased by compressing 0, and the biasing force is decreased when the field is soft. At this time, as shown by the imaginary line in FIG. 1, the compression spring 20 is compressed when the mud hardness detection piece 30 swings upward, but the outer wire attachment end a and the inner wire attachment end b
Since the reference distance from the sensor float 7A is kept constant, the center of swing of the scale-type swing arm 14 also moves upward, and the sensor float 7A shifts to the forward upward position. Therefore, the sensor sensitivity is switched to become lower. If the mud hardness detection piece 30 swings downward, the sensor float 7
A shifts to a forward-down position.

The mud hardness detection piece 30 has an action part 30B connected to the base end part 30A so as to be relatively slidable and fixable with a screw.
It is configured such that the distance L to the center of swing of A can be changed, and when there are large changes in the hardness or softness of the field, the distance L is made smaller to dull the sensing sensation as a detection piece and to minimize changes. If the interval L
Increase the size and sharpen your sense of detection.

The outer wire attachment end a is located on the circumference of the same radius of curvature R as the inner wire attachment end b that swings about the connection axis X, and the inner wire 17a is connected to the vertical swing of the sensor float 7A.
It is designed to reduce vibration. Of course, the outer wire attachment end a may be located anywhere near the circumference of the same radius of curvature R.

[Another example]

B. The seedling planting device drive lifting mechanism 15 may be a pneumatic cylinder other than a hydraulic cylinder or a mechanical link mechanism using an electric motor.

○B As the means for controlling the elevation of the seedling planting device, a wheel case with a propulsion wheel pivoted at the lower end is pivoted to the machine frame so as to be able to swing up and down around a mounting fulcrum, and this wheel case is allowed to swing up and down with respect to the machine body. In particular, it may be one used in a walking rice transplanter that controls the raising and lowering of the seedling planting device 8.

C. The link member 14 pivotally supported by the front end bracket 13 is not limited to a balance-type swing arm.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, and FIG. 1 is a side view showing how the sensor float and the mud hardness detection piece are attached, and FIG. 3 is a front view of FIG. 2, and FIG. 4 is an overall side view. 7A...sensor float, 8...seedling planting device,
13... Front end bracket, 14... Link member,
16...Hydraulic valve for controlling the elevation of the seedling planting device, 17
...Release wire, 17a...Outer wire,
30...Mud hardness detection piece, 30A...Base end, 30
B... Acting part, 32... Support member, a... Outer wire attachment end, b... Inner wire attachment end,
X...rear fulcrum, l...standard interval, L...interval.

Claims (1)

[Claims] 1. The link member 14 is pivoted to the front end bracket 13 of the sensor float 7A, which is pivotably supported to be vertically swingable around the rear fulcrum X with respect to the seedling planting device 8 and is biased in the downward direction. The hydraulic valve 16 for controlling the elevation of the planting device and the link member 14 are interlocked and connected by the inner wire 17a of the release wire 17, and the outer wire 17b end of the release wire 17 is connected to the support member 32 extending from the seedling planting device 8. is attached, and the seedling planting device 8 is controlled to rise and fall so as to keep the reference interval l between the inner wire attachment end b and the outer wire attachment end a constant based on the up-and-down swinging motion of the sensor float 7a due to ground pressure fluctuations. At the same time, the inner wire attachment end b and the outer wire attachment end a are located on or near the same circumference centered on the rear fulcrum A mud hardness detection piece 30 is installed that detects the mud hardness and automatically adjusts the downward biasing force of the sensor float 7A according to the detection result.
This rice transplanter is configured so that the distance L between A and A can be freely changed and adjusted.