JPH0458292B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a sensor for a seedling planting device based on the vertical swing of a sensor float related to ground pressure fluctuation corresponding to a machine body moving up and down along a tiller. The seedling planting device is raised and lowered to maintain the attitude of the float within a certain range, and the seedling planting device is configured to maintain a constant attitude with respect to the field surface, and the device is configured to move into the mud and move the aircraft. The present invention relates to a rice transplanter in which the sensitivity of the elevation control of a seedling planting device can be automatically adjusted based on the amount of oscillating displacement of a mud hardness detection piece that oscillates due to accompanying running resistance.

[Conventional technology]

In this type of rice transplanter, conventionally, in order to stabilize the raising and lowering control of the seedling planting device regardless of the hardness or softness of the field, the spool of the control valve for the raising and lowering mechanism driving the seedling planting device was replaced with a mud hardness detection piece. In conjunction, the neutral position of the spool is moved based on the detection result of the mud hardness detection piece, making the raising/lowering control sensitivity of the seedling planting device less sensitive when the field is hard, and sharper when the field is soft. There are some configurations that allow for settings like this (for example, Japanese Patent Publication No. 57-41886).

[Problem that the invention seeks to solve]

However, in this case, a mechanism linked to the mud hardness detection piece is required for the valve body, and a wire mechanism linked to the sensor float is required for the valve spool. Since it has a sliding structure, not only are wire mechanisms required for each valve body and spool, but the sliding structure for the valve body is also large, leading to an increase in the size of the overall structure. .

An object of the present invention is to provide a device that can change the object of cooperation with the mud hardness detection piece and simplify the biasing mechanism.

[Means for solving problems]

In the patented structure of the present invention, a scale-type swinging arm is pivotally supported to be vertically swingable on the front end bracket of a sensor float which is pivotably supported on a seedling planting device so as to be vertically swingable around a rear fulcrum, A linkage mechanism to the seedling planting device driving elevating mechanism is attached to the front end of the movable arm, and the sensor float is attached to the rear end, which is located on the opposite side of the front end across the pivot point of the scale-type swing arm, in the direction of ground contact. A biasing mechanism is provided to apply pressure, and the reference distance between the reference position of the seedling planting device and the front end of the scale-type swinging arm is kept constant based on the vertical swinging motion caused by ground pressure fluctuations of the sensor float. The scale-type mud hardness detection piece controls the raising and lowering of the seedling planting device, and swings against the biasing force of the biasing mechanism due to the ground resistance caused by the movement of the aircraft after plunging into the mud. It is attached so as to be able to swing integrally with the swinging arm, and the downward biasing force of the biasing mechanism is automatically adjusted by the swinging of the mud hardness detection piece. is as follows.

[Function] By focusing on the movement of the sensor float that controls the raising and lowering of the seedling planting device, and by linking the downward biasing mechanism of this sensor float with the mud hardness detection piece, it is possible to detect soil hardness when the field is hard. The vibration of the mud hardness detection piece due to the ground resistance increases the biasing force of the biasing mechanism to dull the sensing sensitivity of the sensor float, and when the field is soft, the ground resistance of the mud hardness detection piece decreases. Due to the rocking inward into the mud, the biasing force of the biasing mechanism is reduced, the sensing sensitivity of the sensor float is dulled, and the raising and lowering operation of the seedling planting device can be stabilized. Moreover, since the mud hardness detection piece is attached to be able to swing integrally with the scale-type swinging arm that transmits the biasing force from the downward biasing mechanism to the sensor float, the downward biasing mechanism is attached to the mud hardness detection piece. It is also used as a force structure.

Furthermore, a linkage mechanism to the seedling planting device drive elevating mechanism is connected to the front end of the balance-type swinging arm across the pivot point, and a biasing mechanism is connected to the rear end, so that, for example, a mud hardness detection piece When the lever swings upward due to running resistance, the scale-type swinging arm interlocks and swings upward, changing the installation length of the biasing mechanism in the direction of increasing the biasing force. In this case, since the seedling planting device is controlled up and down so that the front end of the scale-type swinging arm always maintains a constant distance from the reference position of the seedling planting device, the above-mentioned mud hardness detection piece can be used. As the scale-type swing arm swings, the pivot point of the scale-type swing arm to the sensor float moves up and down in the same direction as the rear end. Therefore, when the mud hardness detection piece swings upward due to running resistance, the pivot point moves upward, and the sensor float takes a more forward-upward attitude.
Sensor sensitivity becomes dull.

〔Effect of the invention〕

Because of this effect, compared to the conventional system that adjusts the sensitivity to the raising and lowering control of the seedling planting device by adjusting the relative position between the valve body and the spool, a mechanism that only changes the biasing force of the sensor float is sufficient. The structure is simple, and since the biasing mechanism of the sensor float is also used as the biasing mechanism of the mud hardness detection piece, the biasing structure can be made simple. .

In addition, due to the effect of the above, compared to a method in which the sensing sensitivity to the sensor float is changed only by the urging force of the urging mechanism against the sensor float, changes in the sensing sensitivity can also be assisted by changes in the attitude of the sensor float. , the sensing sensitivity can be controlled more reliably.

However, as having the above effects,
There is a device disclosed in Japanese Patent Application Laid-Open No. 58-20104, which uses a bending link that connects the front end bracket of the sensor float and the seedling planting device, and a balance type that connects to the mud hardness detection piece. The number of parts is smaller than that of the present invention, in which the swinging arm is configured as a separate pair, and the number of parts is large, and the biasing mechanism for the sensor float and the biasing mechanism for the mud hardness detection piece are configured separately, and are configured to serve as both. However, in the case of the present invention, a biasing mechanism is connected to the front and rear ends of the scale-type swinging arm, and a linkage mechanism to the seedling planting device drive elevating mechanism is connected to the scale-type swinging arm. Since the mud hardness detection piece is attached to the swing arm so that it can be integrally operated, the structure as a whole can be extremely simplified, the arrangement of each component is easy, and the maintainability is also excellent.

〔Example〕

As shown in Figure 5, engine 1 is installed at the front of the aircraft.
The aircraft body equipped with the mission case 2 and the control section 3 is connected to the seedling platform 4, the seedling planting mechanism 5, the planting case 6,
A seedling planting device 8 is interlocked and connected via an elevating link mechanism 9 so that it can be driven up and down from the two side floats 7B and a group of 7 grounded floats equipped with a sensor float 7A located between the side floats 7B. The machine has been configured.

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 that is rotatably supported around its own axis with respect to the planting case 6 so as to be integrally rotatable. and the rear end bracket 1 of the sensor float 7A located at the free end of the sensor float 7A and the center of the ground float 7 group.
2 are interlocked and connected so as to be relatively swingable, and the sensor float 7A is pivotally supported to operate the sensor so as to be able to swing up and down, using the connection axis X between the bracket 12 and the free end of the connection arm 11 as a rear fulcrum. be.
A scale-type swinging arm 14 that can swing up and down is pivotally supported on the front end bracket 13 of the sensor float 7A, and an inner wire 17a of a linking wire 17 is linked to the front end of the swinging arm 14. A control provided for a hydraulic cylinder 15, which is an example of an elevating mechanism for driving an elevating link mechanism 9 for the seedling planting device 8, is interlocked and connected to a valve 16. More specifically, the inner wire 17a is connected to the spool 1 of the control valve 16.
It is interlocked and connected to a bracket 19 fixed to an operating shaft 18 that operates 6a in forward and reverse directions. Further, a compression spring 20, which is an example of a biasing mechanism for swinging and biasing the sensor float 7A downward, is applied to the rear end of the balance-type swinging arm 14. 1st
As shown in FIG. 3, this compression spring 20 mounting structure will be described in detail.
A member 23A, which is approximately U-shaped in plan view, is loosely fitted so as to be able to swing up and down around the longitudinal axis, and a U-shaped member 23B, which has both webs butted against each other, is fixed to this U-shaped member 23A. A swinging metal fitting 23 is configured. 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 Z. On the other hand, the scale-type swinging arm 1
A connecting rod 25 which is connected to the rear end of 4 so as to be relatively swingable is made to pass through the upper spring receiving member 24 and project upwardly, and is fixed to the spring receiving part 26A and the spring receiving part 26A to this connecting rod 25. A lower spring receiving member 26 made of a pipe 26B is fitted onto the outside and penetrated through the upper spring receiving member 24. The compression spring 20 is mounted between the upper and lower spring receiving members 24 and 26 so as to be fitted onto the connecting rod 25. The connecting rod 25 and the upper end of the pipe 26B of the lower spring receiving member 26 are screw-fitted, and the lower spring receiving member 26 is rotated and screwed, and the upper and lower spring receiving members 24, 26 are moved by relative sliding movement with respect to the connecting rod 25. By adjusting the installation interval, 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.
According to 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 up and down due to ground pressure fluctuations against the biasing force of the compression spring 20. The end of the outer wire 17b, which serves as the reference position 32 of the seedling planting device, is extended to the lateral side of the square member 23B and is located on the circumference of the illustrated radius R centered on the connection axis X. The device is configured to control the raising and lowering of the seedling planting device 8 so that the reference distance L from the front end of the scale-type swinging arm 14 is constant.

As shown in FIGS. 2 and 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 projection 29 that engages with the U-shaped member 23A from a holder 28 that can swing together with the planting adjustment lever 27 is provided. is provided protrudingly, and by swinging the planting adjustment lever 27, the swinging metal fitting 23 is swung around 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 balance type swinging arm 14 and a mud hardness detection piece 3 are attached to a horizontal pivot shaft 22 which is pivoted to a front end bracket 13 of the
0 is attached so that it can rotate integrally through a slotted portion. The mud hardness detection piece 30 plunges the action part 30B 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 detecting the hardness and softness of the field. It is structured as a mechanism. The mud hardness detection piece 30 can swing integrally with the scale-type swinging arm 14, and the harder the field becomes, the more it swings upward to compress the compression spring 20 and lower the sensor float 7. The sensitivity of the sensor float is varied depending on the hardness and softness of the field so that the downward biasing force is increased, and when the field is soft, the biasing force is decreased. At that time, as shown by the imaginary line in Figure 1, the compression spring 2
0 is compressed when the mud hardness detection piece 30 swings upward, but since the reference distance L between the outer wire end 17b and the front end of the balance type swinging arm 14 is kept constant, the balance type The center of the swing path of the 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. On the other hand, if the mud hardness detection piece 30 swings downward, the sensor float 7A shifts to the forward downward position.

From the above, since the mud hardness detection piece 30 is fitted to the horizontal pivot shaft 22 so as to be able to swing together, it is also possible to swing together with the balance type swing arm 14. The biasing mechanism 20 acting on the rear end of the arm 14 biases the arm 14 toward the side that plunges into the mud. In other words, the biasing mechanism 20
is also used to act on the sensor float 7A and the mud hardness detection piece 30.

[Another example]

B. The biasing mechanism 20 may be a tension spring that biases the rear end of the scale-type swinging arm 14 downward, or any mechanism other than a spring that can exert an elastic force may be used.

○B The linking mechanism 17 may be a string-like member.

(c) 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.

○D As the means for raising and lowering 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. Depending on the situation, it may be one used in a walk-behind rice transplanter that controls the raising and lowering of a seedling planting device.

○E As shown in FIG. 4, the sensor float 7
A vertically swingable arm 31 is attached to the front end bracket 13 of A, and the interwire 17a is attached to the tip of this arm 31, and is extended from the planting case 6 and placed in the bracket 32 as a reference position of the seedling planting device. Attach the end of the outer wire 17b and connect this bracket 32 and the arm 31.
A compression spring 20 is provided between the mud hardness detection piece 3 which can be operated integrally with the sensor float 7A and the arm 31.
It also functions as a mechanism for biasing the mud hardness detection piece 30 toward 0, and the front end bracket 13 of the sensor float 7A is
The transverse axis Y of the sensor float 7A and the arm 31 may be moved up and down in the same direction, and the attitude of the sensor float 7A may be changed to be forward-upward and forward-downward.

[Brief explanation of drawings]

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, FIG. 4 is a side view showing another example of how the sensor float and mud hardness detection piece are attached, and FIG. 5 is an overall side view. It is. 7A...sensor float, 8...seedling planting device,
13... Front end bracket, 14... Scale type swinging arm, 15... Seedling planting device drive lifting mechanism, 17...
... Linkage mechanism, 20 ... Biasing mechanism, 32 ... Reference position, 30 ... Mud hardness detection piece, X ... Rear branch, Y ...
...Pivot point, L...Reference interval.

Claims (1)

[Claims] 1 Seedling planting device 8 that can swing up and down around the rear fulcrum X
A scale-type swinging arm 14 is pivotably supported vertically on the front end bracket 13 of the sensor float 7A, which is pivotally supported on the front end bracket 13 of the sensor float 7A. In addition to attaching the linkage mechanism 17, a biasing mechanism 20 for pressing the sensor float 7A in the direction of ground contact is provided at the rear end of the scale-type swinging arm 14, which is located on the opposite side to the front end across the pivot point Y. So, sensor float 7
Based on the vertical swinging motion caused by ground pressure fluctuations A, the seedling planting device 8 is controlled up and down in order to keep the reference distance L between the reference position 32 of the seedling planting device and the front end of the scale-type swinging arm constant. , and the mud hardness detection piece 30, which swings against the biasing force of the biasing mechanism 20 due to the ground resistance accompanying the movement of the aircraft after plunging into the mud, is pivoted integrally with the balance type swing arm 14. movably mounted,
In this rice transplanter, the downward biasing force of the biasing mechanism 20 is automatically adjusted by swinging the mud hardness detection piece 30.