JPH0233323B2 - JOYOGATATAUEKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a seedling planting device to the rear of a passenger vehicle so that it can be raised and lowered, and connects some of the soil leveling floats installed in parallel to the seedling planting device to sensors for detecting ground pressure. The present invention relates to a riding type rice transplanter in which the sensor float is configured as a float, and the sensor float is linked to a lift control mechanism of a seedling planting device so as to maintain the detected ground pressure of the sensor float within a set range.

Generally, in rice transplanters, the height of the seedling planting mechanism relative to the rice field surface is changed by adjusting the mounting fulcrum of the soil leveling float near the seedling planting mechanism up and down, thereby adjusting the planting depth. However, in the past, the fulcrum of each soil leveling float was adjusted independently, which not only made the adjustment operation cumbersome, but also made it difficult to plant each seedling planting mechanism when the adjustment amount was incorrect. Differences in depth sometimes occurred.

In addition, the planting depth is often adjusted after driving around the field for a short distance to confirm the planting depth, and the operator on board must stop the machine and move to the seedling planting device once in place. do. By the way, riding-type rice transplanters are generally equipped with a multi-row seedling planting device of four or more rows in order to increase efficiency, and the installation range of soil leveling floats is also wide. Therefore, a worker who has descended on the field must move to the left, right, and rear of the seedling planting device to adjust each soil leveling float, which is not only extremely troublesome in fields with deep tillers, but also causes trouble after trampling the field. There was also a risk that the seedlings would interfere with the planting of the seedlings or trample over the already planted seedlings.

In addition, especially regarding the sensor float, if the mounting height of the float is different from that of other soil leveling floats when adjusting the planting depth, the grounding condition of the sensor float will change and the sensing characteristics will change, making it difficult to properly control the elevation. This was not carried out and there were drawbacks.

The present invention eliminates these conventional drawbacks, allows easy and simple adjustment of planting depth, and provides good vertical control of the seedling planting device by stable ground pressure sensing regardless of the adjustment of the planting depth. The aim was to provide a riding-type rice transplanter that could do the same, and its feature is that the mounting fulcrums near the seedling planting mechanism for all the soil leveling float groups, including the sensor float, can be simultaneously mounted at the same time using a single operating tool. The main feature is that the height can be adjusted in both directions.

In other words, according to the present invention, since it is only necessary to operate one operating tool at one location, there is no need to move around the field, adjustment work is simple and quick, and adjustment errors for each float can be reduced. It is now possible to plant all rows to the desired depth without any occurrence of seedlings.

In addition, since the sensor float is also adjusted at the same time, the sensor sensing characteristics can be stably maintained and the raising and lowering of the seedling planting device can be controlled favorably.

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

As shown in FIGS. 1 and 2, the rice transplanter of the present invention has a seedling planting device 2 for planting six rows connected to the rear of a passenger vehicle body 1 so as to be able to move up and down. While reciprocating and horizontally moving the placed seedling tray 3 at a constant stroke, six sets of seedling planting mechanisms 4, 4, etc. are operated near the lower end of the seedling tray 3, and one seedling from the pine-shaped seedling A is planted. It is constructed so that the seedling blocks for planting are divided and planted on the rice field T.

At the bottom of the seedling planting device 2, a group of four hollow soil leveling floats 21, 21' made of synthetic resin are arranged side by side, and the soil leveling floats 21, 21'...
The structure is such that divided seedlings can be planted on a field surface T that has been leveled.

These soil leveling floats 21, 21'... have arms 22, 22' that are pivoted concentrically in parallel to the rear of the planting case 5 at their longitudinal intermediate portions (approximately corresponding to the planting position). ...Bracket 23,
A support shaft 24 is pivotally connected via a support shaft 23' and horizontally supported on the front part of the planting case 5 so as to be rotatable and fixed.
Each earth leveling float 2
1, 21'... are connected near the front ends, and each soil leveling float 21, 21'... is connected to the rear fulcrum P, depending on the change in the relative distance between the seedling planting device 2 and the field surface T.
It is configured to be able to swing up and down around P′. Further, the arms 22, 2 corresponding to the front and rear
2'... and 25, 25'... are links 27, 2
7'..., and by adjusting the rotation of the support shaft 24, all the arms 22, 22'... are simultaneously swung, so that the rear supports P, P'... of all the ground leveling floats 21, 21'...
... up and down with respect to the planting case 5, and as all the arms 22, 22'... swing, the mounting fulcrum R of each bending link 26, 26'...
The structure is such that the planting depth can be adjusted by changing the planting depth. Also, each leveling float 21, 2
The brackets 23, 23'... of the arms 22, 22'... and the brackets 23, 23'... are also formed with a plurality of pivot connection holes 28... in the vertical direction.
The planting depth can also be adjusted by changing the connection position with 23'. Rotation adjustment and fixation of the support shaft 24 are performed by operating an operating lever 29 provided on the support shaft 24 and selectively engaging the multistage fixing locking portion 30.

One of the soil leveling floats 21 21' (the second one from the right in the embodiment) operates as a sensor float that detects fluctuations in the relative separation between the seedling planting device 2 and the rice field T as ground pressure fluctuations. , is configured to automatically control the raising and lowering of the seedling planting device 2 based on this detection result.

That is, the intermediate bracket 23' of the sensor float 21' is pivoted to one end of an L-shaped arm 31 which is pivoted to the arm 22' relative to the sensor float 21', and is connected to the other end of the L-shaped arm 31 and the arm 22'. A tension spring 32 is installed between the sensor float 22 and the L-shaped arm 31, and the L-shaped arm 31 is always urged to swing downward, and the L-shaped arm 31 swings in response to changes in the ground pressure of the sensor float 21'. has been done. An inner wire end portion of a release wire 33 is connected to the other end of the L-shaped arm 31, and an outer wire end portion of the release wire 33 is supported by a connecting portion between the arm 22' and the link 27. The swinging displacement of the arm 31 is transmitted via a release wire 33 to a control section of the lift arms 10, 10, which is an elevating drive mechanism.

The lift arms 10, 10 are forcibly swung upward and swung downward under their own weight by a single-acting hydraulic cylinder 34, and the hydraulic cylinder 34 is a three-position control valve disposed at the bottom of the seat 48. 35
It is configured to be expanded and contracted and fixed by switching. As shown in FIGS. 6 and 7, the control valve 35 swings the lift arm 10 up when the spool 36 moves in the U direction, swings it down when the spool 36 moves in the D direction, and returns to the neutral position N. It is constructed so as to be hydraulically locked, and is constructed so that manual spool operation and automatic spool operation in accordance with ground pressure detection of the sensor float 21' can be performed.

In other words, the valve 35 includes an inner and outer double shaft 37,
A manual operating lever 39 and a spool operating arm 40 are fixed to the outer shaft 38, and an automatic operating lever 41 and a spool operating fork 42 are fixed to the inner shaft 37. The spool operating arm 40 is arranged so as to be able to abut and press the tip pin 43 of the spool 36 only in the upward operating direction U, and the spool operating fork 4
2 is engaged with the pin 43 so that it can be operated in forward and reverse directions. The valve 35 also has a manual operating lever 39 that engages with the spool operating arm 40 in the neutral position N.
A spring ball 44 is provided to maintain the neutral posture. Furthermore, between the lift arm 10 and the manual operation lever 39, there is an automatic return rod with a stopper that automatically returns the operation lever 39 to the neutral position when the lift arm 10 is swung to the upper and lower limits. 45 have been constructed.

Further, the other inner wire end of the release wire 33 is connected to the automatic operation lever 41, and a compression spring 47 is interposed between the outer wire support member 46 and the lever 41.

Next, the raising and lowering operation of the seedling planting device by the raising and lowering mechanism having the above structure will be explained.

(i) Manual lifting/lowering operation Move the manual operating lever 39 to the rear r from the neutral position n.
When the swinging operation is performed, the spool 36 is moved in the U direction due to the contact between the operating arm 40 and the pin 43, and the lift arm 10 is forcibly swung upward.
The seedling planting device 2 is raised. Furthermore, when the seedling planting device 2 is lifted from the field surface T and the operating lever 39 is swung forward f from the neutral position n, the operating arm 40 is separated from the pin 43 and the spool 36
can be shifted to the lowering operation direction D, and at this time, the sensor float 21' is lowered by its own weight, so the L-shaped arm 31 swings and pulls the inner wire 33a against the spring 47, and the automatic operation lever 41 is swung in the downward direction, the spool 36 is moved in the downward direction D via the fork 42, and the seedling planting device 2 is lowered by its own weight. In addition, when the operation lever 39 is returned to the neutral position n while the seedling planting device 2 is floating above the ground, the holding force of the lever 39 by the spalling ball 44 is set to be larger than the operation of the automatic operation lever 41. Because of this, the spool 36 is attached to the arm 40
The seedling planting device 2 is held in the neutral position N by contacting with the
is fixed at any ground height position.

(ii) Automatic lifting/lowering operation When the aircraft is in the field, press the operating lever 3.
When the seedling planting device 2 is swung forward f to the maximum operating limit and held in position by the pressing force of the spring ball 44, the seedling planting device 2 descends under its own weight as described above.
When the ground pressure acting on the sensor float 21' reaches a certain value, the sensor float 21'
1' rises, and the L-shaped arm 31 swings against the spring 32. As a result, the inner wire 33a is loosened, and the automatic operation lever 41 is brought to the neutral position by the restoring force of the spring 47. After it is swung back to the position, the seedling planting device 2 stops descending. In other words, when the seedling planting device 2 is lowered to a certain height relative to the rice field T, it is automatically stopped. In this state, the planting traveling work is performed.

When the tractor 1 reaches a deep part of the tiller G and sinks during the above-mentioned planting operation, the sensor float 21' is relatively pushed into the field surface T and the ground pressure increases, and this ground pressure becomes lower than the set value. When the inner wire 3 becomes larger and the rear fulcrum P' is pushed up and the K-shaped arm 31 swings against the spring 32, the inner wire 3
The automatic operation lever 41 is pressed by the spring 47 by the amount of slack in the spool 3a, and the spool 36 moves in the upward direction U, and the seedling planting device 2 is driven upward. and,
As the seedling planting device 2 rises, the sensor float 2
When the ground pressure 1' falls to the set value, the automatic operating lever 41 returns to the neutral position due to the balance between the springs 32 and 47, and the raising of the seedling planting device 2 is stopped.

Also, if the tractor 1 rides on a shallow part of the tiller G during the planting operation, the sensor float 21'
The L-shaped arm 31 swings due to the weight of the lever, pulls the inner wire 33a, and swings the automatic operating lever 41 in the downward direction. When the ground pressure of the sensor float 21' rises to the set value due to the descent of the seedling planting device 2, the automatic operation lever 41 is returned to the neutral position and the descent control is stopped.

If there are local irregularities on the field surface T during the planting operation, the front part of the sensor float 21' will follow these irregularities, but the sensor float 21' cannot simply swing around the rear fulcrum P'. No elevation control is performed, and the required elevation control is performed only when the average ground pressure on the sensor float 21' deviates from the set reference value and the upward or downward force acting on the rear fulcrum P' increases. .

[Brief explanation of drawings]

The drawings illustrate an embodiment of the riding-type rice transplanter according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an overall plan view, Fig. 3 is a plan view of the seedling transplanting device, and Fig. 4 is a seedling transplanter. FIG. 5 is a plan view of the ground pressure detection section, FIG. 6 is a side view showing the configuration of the automatic elevation control mechanism, and FIG. 7 is a vertical cross-sectional rear view of the valve operating section. 1...Passenger vehicle body, 2...Seedling planting device, 21'
...Sensor float, 29...Operation tool, P,
P′...Mounting fulcrum.

Claims (1)

[Claims] 1. A seedling planting device 2 is connected to the rear of the passenger vehicle body 1 so as to be able to rise and fall freely, and some of the soil leveling floats installed in parallel on the seedling planting device 2 are connected to a sensor float for detecting ground pressure. 21', and the sensor float 21' and the seedling planting device lifting control mechanism are linked to maintain the ground pressure detected by the sensor float 21' within a set range. This riding-type rice transplanter is configured such that the heights of mounting fulcrums P and P' near the seedling planting mechanism of a group of soil leveling floats can be adjusted simultaneously in the same direction using one operating tool 29.