JPH022566B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a rice transplanter that can stabilize the planting depth regardless of pitching of the vehicle body and regardless of changes in mud hardness in the field to be planted. For details regarding the attached equipment lifting and lowering operation device, please refer to the float.
The seedling planting device is attached to the seedling planting device so that it can move up and down and is biased downward, and the seedling planting device is automatically attached to the vehicle body so that the vertical position of the float relative to the seedling planting device is maintained within a set range. A control mechanism is provided for raising and lowering the float, and the elastic device for biasing the float downward increases the biasing force as the mud hardness detection piece pushed into the mud swings due to an increase in mud hardness. It relates to things that are interlocked and connected so that they can be changed.

In so-called soft fields with a lot of moisture, the mud pressure acting on the mud hardness detection piece is very small, so in order to detect small changes in mud pressure, it is better to have a wider pressure receiving area of the mud hardness detection piece. preferable. On the other hand, in so-called hard fields with little moisture, there is a tendency for a large number of mud clumps to exist due to the nature of the soil that tends to harden, and the fact that tillage tends to be insufficient. The piece contacts this mud mass and swings unnecessarily, and as a result, the descending force of the float becomes abnormally strong, causing the float to deviate from the planting depth. The smaller the pressure receiving area, the better.

Therefore, one possible way to solve this problem is to prepare various types of mud hardness detection pieces with shapes depending on the conditions of each field and replace them at the appropriate time.
It is expected that this will be troublesome for workers.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to sensitively detect subtle changes in mud pressure in fields with soft mud, and to avoid as much as possible the negative effects from mud lumps in fields with hard mud. The objective is to provide such functionality without replacing the mud hardness detection piece.

The present invention provides a device for raising and lowering a seedling planting device of the rice transplanter described above, which is configured to be swingable around a longitudinal axis so that the width of the mud hardness detection piece can be changed, and The present invention is characterized in that it is provided with a spring that urges the width detection piece toward the side with a large width.

Next, the effects of the configuration of the present invention will be described.

That is, in soft fields, the biasing force of the spring causes the mud hardness detection piece to open around the longitudinal axis, increasing the pressure receiving area that receives mud pressure, and making it possible to sensitively sense changes in mud pressure. . vice versa,
As the amount of mud increases, the mud hardness detection piece closes due to the large mud pressure and the pressure receiving area becomes narrower, and the probability of contact with mud lumps in the field decreases, making it less susceptible to negative effects and causing unnecessary shaking. There's nothing to do. Therefore,
While avoiding the above-mentioned inconveniences, it has become possible to carry out good seedling planting work while maintaining the planting depth as constant as possible in fields with soft or hard mud.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, left and right front wheels 1,
1. At the rear of the vehicle body equipped with 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, and a pine-shaped seedling stand placed on this seedling stand 5. A seedling planting device 7 is provided which is equipped with a planting claw 6, etc., which takes out seedlings one by one and plants them in the field while circulating up and down along the lower end row of seedlings. It is configured for planting seedlings.

The seedling planting device 7 is connected to the vehicle body via a quadruple link mechanism 8 so as to be movable up and down in a parallel position, and a hydraulic cylinder 9 is provided for raising and lowering the link mechanism 8 with respect to the vehicle body, Also,
The seedling planting device 7 is configured to be able to be raised and lowered relative to the vehicle body by extending and contracting the hydraulic cylinder 9.

As shown in FIG. 3, the rear end of a float 10 for leveling the field for planting seedlings is pivoted to the seedling planting device 7 so as to be rotatable around the horizontal axis X, and the front end of the float Link mechanism 1 that can be bent and extended with respect to the planting device 7
1, and the link mechanism 1
1 to extend and elastically bias the float 10 to descend, and a swing operating arm 14 of a control valve 13 for switching the operating state of the hydraulic cylinder 9 and the link mechanism 11. are interlocked and connected by a wire 15, and when the swing position of the float 10 relative to the seedling planting device is within the appropriate range, the control valve 13 is brought into the lifting stop state in which the operation of the hydraulic cylinder 9 is stopped. When the rise is out of line, the control valve 13 is connected to the hydraulic cylinder 9.
When the control valve 13 is extended and the seedling planting device 7 is raised, and when the lowering range is out of the proper range, the control valve 13 is activated to shorten the hydraulic cylinder 9 to lower the seedling planting device 7. The system is configured so that the switching operation can be performed automatically, and the swinging position of the float 10 relative to the seedling planting device is automatically maintained within a set range to maintain a constant planting depth. There is.

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. .

Further, the mud hardness detection piece 16 is configured to be able to swing backward with respect to the arm 17 fixed to the seedling planting device 7 as the mud hardness increases while it is plunged into the mud at a location in front of the float 10. Pivoted so that it can swing,
In addition, the mud hardness detection piece 1 is provided in a state where it is biased by a spring 16a on the side that enters the mud.
6 is operatively connected to one end of the float downward biasing spring 12 via a release wire 18 so that the biasing force thereof can be increased as the float is swung backward. , the downward biasing force of the float 10 can be automatically changed to a force corresponding to the hardness of the mud.

As shown in FIG. 4, the mud hardness detection piece 16
is formed into two parts on the left and right, and each of the divided detection pieces 16A, 16A is attached to a swing type support rod 16B so as to be able to swing back and forth around the longitudinal axis Y of the inner end in the width direction. The mud hardness detection piece 16 is pivotably mounted so that the width of the mud hardness detection piece 16 can be changed, and a spring 19 is provided that biases both the divided detection pieces 16A, 16A toward the side where the width is larger.
Furthermore, a pin 20 that restricts the swinging range of both divided detection pieces 16A, 16A is attached through the pin 20, so that the width of the mud hardness detection piece 16 is changed as the mud hardness increases as the mud hardness increases. It is configured so that it can be changed to a small cloth.

In short, the smaller the mud hardness, the mud hardness detection piece 1
6 is widened to more sensitively sense changes in mud pressure,
The structure is such that the harder the mud becomes, the narrower the width becomes, making it less susceptible to the negative effects of mud lumps.

Reference numeral 21 in the figure is a manual lift lever that locks and swings the spool of the control valve 13, which is biased toward the lowering operation by the float 10, to the upper operation by the locking arm 22. , a raised position U, a raised/lowered stop position N, a lowered position D, and a position A in which the control valve 13 is made freely operable and automatically operated by the float 10 as described above.

In carrying out the present invention, the position where the mud hardness detection piece 16 is provided can be changed in various ways, such as being provided on the side of the float 10, for example. The mounting position of the mud hardness detection piece 16 can be changed in various ways, for example, by mounting the mud hardness detection piece 16 on the float 10 so as to move up and down integrally therewith. Further, the mud hardness detection piece 16 may be formed in a single plate shape and may be swung around the longitudinal axis of one end in the width direction.

Furthermore, the means for supporting the float 10 can be modified in various ways, such as by moving the float 10 up and down by half a line 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.

[Brief explanation of drawings]

Figure 1 is a side view of the riding rice transplanter, Figure 2 is a schematic plan view of the seedling planting device, Figure 3 is a schematic diagram of the lifting and lowering operation device of the seedling planting device, and Figure 4 is a diagram of the mud hardness detection piece. FIG. 7...Seedling planting device, 10...Float, 12...
...Elastic tool for downward bias, 16...Mud hardness detection piece, 1
6A, 16A...Divided detection piece, 19...Spring, Y...Longitudinal axis.

Claims (1)

[Claims] 1. A float 10 is attached to the seedling planting device 7 so that it can move up and down and is biased downward, and the vertical position of the float 10 relative to the seedling planting device is maintained within a set range. A control mechanism is provided to automatically raise and lower the seedling planting device 7 with respect to the vehicle body, and the elastic device 12 for biasing the float 10 downward is a mud hardness detection piece that is biased into the mud. A raising/lowering operating device for a seedling planting device of a rice transplanter which is interlocked and connected so that the biasing force is changed to the side to increase the biasing force as the mud hardness increases due to the rocking of the mud hardness detecting piece 16. The mud hardness detection piece 16 is configured to be swingable around the longitudinal axis Y so as to change the mud hardness detection piece 16. A device for lifting and lowering the seedling planting device of a rice transplanter. 2 The mud hardness detection piece 16 is formed into left and right halves, and these divided detection pieces 16A, 16A
The longitudinal axis Y of each inner end in the width direction
The device for lifting and lowering a seedling planting device of a rice transplanter according to claim 1, wherein the device is configured to swing around the device.