JPH0221766B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a float and a seedling planting device.
A control mechanism is provided that is mounted so as to be movable up and down and biased downward, and that automatically moves the seedling planting device up and down with respect to the vehicle body so as to maintain the vertical position of the float relative to the seedling planting device within a set range. , relates to a rice transplanter provided with a mechanism for changing and adjusting the downward biasing force of the float.

The rice transplanter described above attempts to stabilize the planting depth by automatically raising and lowering the seedling planting device while detecting the height of the seedling planting device relative to the mud by vertically swinging the float. Moreover, by making it possible to change and adjust the downward biasing force of the float according to the hardness of the mud in the field to be planted, the grounding condition of the float against the mud surface can be adjusted according to the hardness of the mud. However, the following disadvantages were encountered:

In other words, in the past, the downward biasing force of the float was manually changed and adjusted over the entire range, but it is difficult for an unskilled person to properly adjust the force to the appropriate force depending on the hardness of the mud. It is difficult to do,
In some cases, seedlings could not be planted at the desired depth.

Therefore, as shown in Japanese Patent Application Laid-Open No. 56-39705, a spring that biases the float in the downward direction is linked with a mud hardness detection piece that can swing back and forth and is displaced backwards in response to mud resistance. There is a structure that automatically adjusts the biasing force of the spring that biases the float in the downward direction depending on the hardness or softness of the mud, but it is not possible to change it manually or automatically. However, by simply adjusting the biasing force of a single spring that biases the float in the downward direction, it is not possible to perform fine control that adapts to various field conditions, such as the degree of water content and the degree of mixing of clay and sandy layers. There is an inconvenience that there is no such thing.

An object of the present invention is to enable fine-grained control more suited to field conditions by devising a float biasing force adjustment structure.

In order to achieve the above object, the characteristic structure of the present invention is such that the downward biasing force change adjustment mechanism includes a spring that biases the float in the downward direction, and
The biasing force of the spring is configured to be able to be set and changed in stages, and a downward biasing force that is automatically changed in response to the detection result of the hardness or softness of the mud is applied to the float. and a mud hardness detection piece linked to the float via a biasing spring, and the biasing spring of the mud hardness detection piece biases the float in a downward direction with respect to the float. The biasing direction is set and linked so that the biasing force increases and decreases in a contradictory manner as the biasing force of the spring of the manual adjustment mechanism increases and decreases, and this configuration provides the following effects.

In other words, is the hard mud in the field generally hard?
An artificial adjustment mechanism that adjusts the biasing force of the float by empirically determining whether it is normal or soft, and an artificial adjustment mechanism that adjusts the biasing force of the float based on the results of detecting whether the mud is hard or soft. It consists of a mud hardness detection piece that automatically changes the mud hardness, and the biasing force of the float is adjusted by two systems of springs with different adjustment means, allowing for fine-grained control suitable for a wider range of field conditions. It becomes possible.

In other words, if only the adjustment by the artificial adjustment mechanism
This may be difficult for inexperienced workers to handle, but by adding adjustment based on signals from the mud hardness detection piece, more suitable control becomes possible.

In addition, it is extremely difficult to maintain appropriate mud surface responsiveness of the float over a wide range of fields, from extremely hard to extremely soft fields, using only the mud hardness detection piece. Adjustments can be made manually and the biasing force can be set in cooperation with this, so it is possible to ensure the responsiveness of the float that is adapted to a wider range of field conditions. In other words, fine control is possible.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, at the rear of the vehicle body, which is equipped with left and right front wheels 1, 1, left and right rear wheels 2, 2, an engine 3, a driver's seat 4, etc., there is a slanted seedling stand 5 that is reciprocated horizontally with a constant stroke; Seedling planting equipped with planting claws 6, etc., which circulates up and down along the lower end row of pine-shaped seedlings placed on this seedling platform 5 to take out seedlings one by one and plant them in the field. A device 7 is provided and is configured to sequentially plant seedlings as the aircraft advances.

The seedling planting device 7 is connected to the vehicle body via a parallel quadruple link mechanism 8 so as to be movable up and down in a parallel posture, and a hydraulic cylinder 9 is provided for raising and lowering the link mechanism 8 with respect to the vehicle body. Therefore, the seedling planting device 7 can be raised and lowered relative to the vehicle body by the expansion and contraction operation of the hydraulic cylinder 9.

As shown in FIG. 2, the rear end of a float 10 for leveling the field for seedling planting is rotatably supported around a horizontal axis (X) with respect to the seedling planting device 7, and the front end of the float is interlocked and connected to the seedling planting device 7 via a bendable link mechanism 11, and the link mechanism 11 is biased toward extension to elastically bias the float 10 toward descent. , second spring 12
a, 12b are provided, and a swing operating arm 14 of a control valve 13 for switching the operating state of the hydraulic cylinder 9 is interlocked with the link mechanism 11 by a wire 15.

Then, when the swing position of the float 10 for the seedling planting device is within the appropriate range, the control valve 13 is brought into the lifting stop state where the operation of the hydraulic cylinder 9 is stopped;
When the rise is out of the proper range, the control valve 1
3 to extend the hydraulic cylinder 9 to raise the seedling planting device 7. When the seedling planting device 7 is further moved out of the proper range, the control valve 13 is operated to extend the hydraulic cylinder 9.
The seedling planting device 7 is automatically switched to a state where the seedling planting device 7 is lowered by shortening the float 1.
The device is configured to automatically maintain the swing position of the seedling planting device within a set range to stabilize the planting depth.

In short, the seedling planting device 7 is automatically moved up and down while the height of the seedling planting device relative to the mud is detected based on the vertical movement of the float 10, thereby stabilizing the planting depth. .

In addition, the mud hardness detection piece 16 is swung back and forth with respect to the arm 17 fixed to the seedling planting device 7 so that it can be swung backwards when it comes into contact with the mud as the aircraft advances while plunged into the mud. While the first spring 12a is pivotably supported and the range of forward swinging is restricted, the biasing force of the first spring 12a can be increased as it swings backwards. A manual operating tool 18, which is connected to one end of the first spring 12a and can be operated in a swinging manner, is connected to the second spring 12b so that its urging force can be changed as the spring moves. A locking frame 20 is provided which is interlocked with one end of the two springs 12b via a wire 19, and further includes a locking frame 20 as a locking member that locks and supports the operating tool 18 at appropriate intervals in the direction of movement thereof. The mud hardness detection piece 16 continuously changes the biasing force for lowering the float consisting of the resultant force of the first and second springs 12a and 12b in response to changes in mud hardness, and the human operating tool is provided. In cooperation with the action of changing the initial biasing force in stages at 18, a descending biasing force changing adjustment mechanism is constructed which can be operated to change the biasing force to correspond to the hardness of the mud.

In short, depending on the hardness of the mud in the field to be planted,
By adjusting the downward biasing force to a larger value as the float becomes harder, it is possible to maintain the ground state of the float 10 against the mud in a desired state.

Reference numeral 21 in the figure is a manual lift lever that locks and swings the control valve 13, which is biased by the float 10 during the downward operation, by the locking arm 22 during the upward operation. It is possible to switch between the position (U), the lifting stop position (N), the lowering position (D), and the position (A) where the control valve 13 is made freely operable and automatically operated by the float 10 as described above. It is structured as follows.

In carrying out the present invention, even if the seedling planting device 7 is located near the mud surface when the aircraft is moving backward,
In order to avoid deformation damage to the mud hardness detection piece 16, the mud hardness detection piece 16 may be configured as follows.

That is, as shown in FIG.
6b is pivoted relative to the arm 17 around the coaxial center (Y), and the mud entry portion 16b
As it moves backward, the spring mounting part 1
An operation section 23 is provided for pressing the button 6a toward the front side.

Further, in the embodiment, the downward urging force adjusting mechanism is provided with the first and second springs 12a and 12b as elastic members for downward urging, but
For example, only the first spring 12a is provided, and the connection position of the first spring 12a to the mud hardness detection piece 16 can be changed and adjusted in the spring expansion/contraction direction using the human operating tool 18.The configuration can be changed in various ways. It is.

Further, when the mud hardness detection piece 16 is provided, its mounting position can be changed in various ways, for example, by mounting it on the float 10 so as to move up and down integrally therewith.

Furthermore, the support means for the float 10 can be modified in various ways, such as by moving the float 10 vertically in parallel or swinging it up and down using the front end as a fulcrum.

In addition, to configure the control mechanism, for example, the float 1
The configuration can be modified in various ways, such as by electrically detecting the zero swing position and operating the control valve 13 electromagnetically.

In the embodiment, the wire 19 and the manual operating tool 18 connected to the second spring 12b are collectively referred to as a manual adjustment mechanism.

[Brief explanation of drawings]

The drawings show an embodiment of the rice transplanter according to the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a diagram of the relationship between a control valve and a float, and Fig. 3 is a side view of another embodiment. It is. 7... Seedling planting device, 10... Float, 12
a, 12b...Spring, 16...Mud hardness detection piece, 18, 19...Artificial adjustment mechanism.

Claims (1)

[Claims] 1 The float 10 is attached to the seedling planting device 7 so as to be movable up and down and biased downward, and the seedling planting device is automatically moved so as to maintain the vertical position of the float 10 relative to the seedling planting device within a set range. A control mechanism for raising and lowering the attachment device 7 with respect to the vehicle body is provided, and the float 1
The rice transplanter is equipped with a mechanism for changing and adjusting the downward biasing force of zero, and the downward biasing force changing and adjusting mechanism is configured to include a spring 12 that biases the float 10 in the downward direction.
b, and is configured such that the biasing force of the spring 12b can be changed in stages, and a lowering mechanism that is automatically changed in response to the detection result of whether the mud is hard or soft. Float the biasing force 1
0, the biasing spring 12a
A mud hardness detection piece 16 is connected to the float 10 via a mud hardness detection piece 1.
The biasing spring 12a of No. 6 is attached to the float 10.
On the other hand, the biasing direction is set so that the biasing force increases and decreases in a contradictory manner as the biasing force of the springs 12a of the artificial adjustment mechanisms 18 and 19 that bias the float 10 in the downward direction increases and decreases. A rice transplanter characterized by being linked.