JPH0157925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a float angle adjustment device for a rice transplanter.

Mainly with riding rice transplanters, when the rice transplanter rotates around the headland, many wheel marks are formed on the headland, so it is necessary to level the rough rice field on this headland, but there is a separate method. It is very troublesome to use agricultural machinery. Therefore, consideration is being given to using floats to forcibly level the wheel marks on the headland when making rounds. In this case, the float is equipped with a hydraulic sensing part to keep the level of the planting device constant with respect to the rice field, but when leveling the headland using the float as mentioned above, It would be a problem if the hydraulic system were activated by sensing irregularities in the wheel tracks.

The present invention has been made based on the above circumstances, and provides a float orientation adjustment device for a rice transplanter, which is configured to be able to adjust the orientation angle of the float without substantially affecting the sensing section of the hydraulic system. This is what we are trying to provide.

For this purpose, the present invention disposes a planting device at the rear of a traveling vehicle body, supports the planting device above the rice field by a float, and has a hydraulic device for raising and lowering the planting device. A sensor for switching the hydraulic system is connected to the float to adjust the level of the planting device relative to the rice field,
A float serving as a switching sensing section of the hydraulic system is provided with means for adjusting the orientation angle with respect to the field surface by tilting the front part thereof up and down, and the orientation angle adjustment means:
The plant is characterized in that the heading angle adjusting means and the planting clutch lever are configured in an interlocking manner so that when the power transmission to the planting device is turned off, the heading angle becomes "large". be.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a side view of a riding-type rice transplanter to which the present invention is applied, Fig. 2 is a plan view of the same, and Fig. 3 is an enlarged side view of the main part of the planting device. 2 is a running vehicle body, 2 is a front wheel, 3 is an engine, 4 is a transmission that receives power from the engine 3, 5 is a chain case provided on the left and right sides of the housing of the transmission 4, and 6 is a shaft support at the rear end of the chain case 5. The rear wheels 6 receive running driving force from the transmission 4 through a chain transmission system provided in the chain case 5.

A parallelogram-shaped elevating link mechanism 7 is provided at the rear of the traveling vehicle body 1, and a planting device 8 is connected and supported to the traveling vehicle body 1 via the elevating link mechanism 7. The planting device 8 includes a planting drive section 9 including a napier shaft, a seedling mounting stand 10, and a planting rod 11.
On the lower side, a center float 12 and a side float 13 are pivoted so that their front parts can move up and down using rear pivot parts 14 and 15 as fulcrums, respectively. A hydraulic cylinder 16 of a hydraulic system for raising and lowering the planting device 8 via the lifting link mechanism 7 is fixed to the traveling vehicle body 1, and its piston rod 17 is connected to the lifting link mechanism 7.
Swing lever 18 connected to the upper link 7a of
is supported by

A float angle adjustment device is provided between the front part of the center float 12 and the frame of the planting device 8. That is, an anchor-shaped adjustment lever 20 is pivotally supported on the frame of the planting device 8 via a pivot pin 19.
A tension coil spring 21 is stretched between the tip of the arm 20a extending to one side and the frame, and elastically supports the tip of the lever 20 upward. Further, the lever 20 has one end of a control wire 22 connected to the tip of an arm 20b extending in the other direction.
The other end is connected to the planting clutch lever 23. The center float 12 is further provided with a spool valve 24 that acts as a sensing section of the hydraulic system. This spool valve 2
4, the housing 24a is pivotally connected to the middle of the lever 20 by a pin 25, and the lower end rod 24b of the spool is pivotally connected to the center float 12 by a pin 26. .
The lever 20 has a link 27 which is pivotally supported in common with the aforementioned pin 25, and a balance rod 28 is pivotally supported on the link 27 by a pin 29. The lower end of the balance rod 28 is commonly pivoted to the pin 26, and both ends thereof include
Tension springs 30 and 31 are attached, and the other ends of the tension springs 30 and 31 are connected to the free end of the lever 20.

The planting clutch lever 23 connects and disconnects the power transmission system of the planting device 8, and has another control wire 22a in addition to the control wire 22, and the other end of this wire 22a is connected to the planting device 8. It is connected to the clutch mechanism of the transmission system of the attached device 8. Then turn this planting clutch lever 23 off.
When operated, the lever 20 rotates via the control wire 22, the front part of the center float 12 moves upward, and the float direction angle becomes "large".
The spool valve 24 is configured in such a manner that its sensitivity decreases as the spool valve 24 moves upward.

In such a configuration, when the planting clutch lever 23 is turned on during normal planting travel, the planting device 8 is activated by the action of the springs 30 and 31.
A mutual repulsion between the frame and the float 12 is maintained, which normally maintains a neutral level at the spool valve 24. If the plowing platform is shallow, the buoyant force applied to the float 12 becomes smaller, and the lower end rod 24b of the spool descends, relieving the pressure oil in the hydraulic cylinder 16 and adjusting the float 12 so that it receives appropriate buoyancy. . Also, if the tiller is deep, float 1
As the buoyancy applied to the float 2 becomes excessive, the lower end rod 24b of the spool rises, applying pressure oil to the hydraulic cylinder 16, operating the lifting link mechanism 7 via the swing lever 18, and placing the float 12 in a state where it receives appropriate buoyancy. Adjustments are made to maintain a constant level of the planting equipment relative to the rice field.

Next, when the planting clutch lever 23 is operated to "off" for turning on the headland, the power transmission to the planting device 8 is cut off, and the control wire 22 is extended, causing the tip of the lever 20 to move upward. lean towards. Due to this inclination, the float 12 and the valve 24 are tilted upward using the pivot portion 14 as a fulcrum. As a result, the contact pressure against the field surface shifts from the tip side to the rear end side of the float 12, the direction angle of the float becomes "large", and the spool valve 24 moves upward, which increases the sensitivity of the sensing section by the float 12. decreases. By lowering the rear part of the float, it is possible to forcefully push mud while driving, and the float can erase wheel marks on the headland. In this case, even if strong mud pushing is performed by the float, the sensitivity of the sensing portion is substantially reduced and the hydraulic cylinder 16 does not operate unduly.

In the embodiment shown in FIG. 5, the spring 31 in the previous example is removed, and one end of the spring 30 in the previous example is connected to a control wire 32 and linked to another float sensitivity adjustment lever 33. By operating this lever 33, even during seedling planting work in the field,
Depending on the hardness or softness of the field, the tension of the spring 30 can be changed to adjust the sensitivity of the sensing section.

Further, in the embodiment shown in FIG. 6, the spring 3
0 is removed, the control wire 22 is connected to the bell crank 34, and the control wire 22 is connected to the bell crank 34.
4 is the float sensitivity adjustment lever 33 and the arm 20
The other end is connected to a control wire 32 connected between Therefore, no matter which control wire 22 or 32 is operated, the lever 20 is rotated against the spring 21.
Therefore, it can be applied to mud pushing on headlands and hard soil in fields.

As explained above, according to the present invention, the adjustment of the orientation angle of the float is configured in conjunction with the planting clutch lever, and when the planting clutch lever is set to "off", the float orientation angle becomes "large", and the float orientation angle is detected by the float. Since the structure is such that the sensitivity of the floating section is reduced, when moving around headlands etc., the sensing section of the hydraulic system is not substantially affected, and the float can push mud strongly. Since the float of the rice transplanter can be used as is for leveling the headland, there is no need to prepare a separate agricultural machine, and work efficiency can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a side view of a rice transplanter showing an embodiment of the present invention, Figure 2 is a plan view of the same, Figure 3 is an enlarged side view of the main part of the planting device, and Figure 4 is partially exploded. FIG. 5 and FIG. 6 are side views of another embodiment. 1... Traveling vehicle body, 7... Lifting link mechanism, 8...
...Planting device, 12...Center float, 16...
Hydraulic cylinder, 18... Swing lever, 20...
...Adjustment lever, 21...Tension spring, 22...
...Control wire, 24...Spool valve.

Claims (1)

[Claims] 1 A planting device is arranged at the rear of the traveling vehicle body, the planting device is supported on the rice field by a float, and a hydraulic device is provided to raise and lower the planting device, and a sensing device is used to switch the hydraulic device. means for adjusting the level of the planting device with respect to the rice field by connecting the part to the float, the float serving as the switching sensing part of the hydraulic system having a front part that can be tilted up and down to adjust the orientation angle with respect to the rice field. Equipped with
When the direction angle adjustment means is turned off to transmit power to the planting device, the direction angle becomes “large”;
A float orientation adjustment device for a rice transplanter, characterized in that the orientation angle adjustment means and a planting clutch lever are configured in an interlocking manner.