JPH06319320A - Non-plowing transplanter - Google Patents

Abstract

PURPOSE:To provide a non-plowing transplanter capable of such power transmission as not to develop shaking of a transplanting part as a whole due to the variation in drive reaction force. CONSTITUTION:In a power transmission mechanism to be used in this non- plowing transplanter having a transplanting part rollably connected to a traveling machine body, the transplanting part is equipped with a planting device and a rotary furrowing device 4 situated in front of said planting device. A hydraulic motor 11 for driving the rotary furrowing device 4 and another hydraulic motor 12 for driving the traveling machine body are arranged in series relative to a hydraulic pump 10 to be driven by an engine 3 set on the traveling machine body. The hydraulic motor 11 is mounted on the transplanting part and a tubular channel 15 to the hydraulic motor 11 is made up from a flexible hydraulic hose, and a pressure control valve 14 is set along a tubular channel through which pressurized oil is introduced into the hydraulic motor 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-tillage transplanter used for planting seedlings in a no-tillage field, and more particularly to a power transmission mechanism of the no-tillage transplanter.

[0002]

2. Description of the Related Art In recent years, in a field that has not been cultivated or scraped, that is, in a no-till field, a rotary type groove device is being used to dig a planting groove while planting rice seedlings in the planting groove. So-called no-till rice planting has come to be carried out by planting one plant at a time using artificial nails. In such a non-tillage rice transplant, a transplanter in which a rotary groove-growing device and a planting device are arranged one after another is used to complete the groove-growing and planting in one step.

More specifically, a no-tillage transplanter (for example,
Japanese Utility Model Publication No. 3-95714, Japanese Utility Model Publication No. 3-102810.
(See Japanese Patent Laid-Open Publication) has a transplanting working unit connected to a traveling machine body having front wheels and rear wheels so as to be vertically movable via a support link, and the transplanting working unit has a plurality of rotary grooving devices and planting devices. In addition, the device is arranged, and the transplanting work unit is normally rotatable (rolled) with respect to the traveling machine body, and has a structure in which the movement of the transplantation work unit is allowed to follow the ups and downs of the field surface.

[0004]

In such a no-tillage transplanter, a chain, a belt or a universal joint has been conventionally known as a means for transmitting a driving force from a traveling machine body to a groove making device. A driving reaction force is applied to the driving force transmission means according to the magnitude of the load applied to the groove making device.
In the field where no-till transplantation is carried out, the difference in local hardness is large and the load on the grooving device fluctuates greatly. Therefore, the driving reaction force applied to the driving force transmitting means also fluctuates greatly. The whole is shaken up and down, left and right (the traveling machine is heavy, so it is not affected so much and the transplanting work part seems to be shaken relative to the traveling machine), and the decline in planting accuracy cannot be avoided. It was

That is, in the case of 2, the driving force is transmitted by wrapping a chain or a belt around two shafts which are horizontal in the lateral direction of the machine body, and the fluctuation of the driving reaction force at this time causes the entire traveling work unit to move the traveling machine body. On the other hand, it swings in the vertical direction and the pitching direction. On the other hand, in the case of (2), the driving force is transmitted by connecting two shafts that are horizontal or have a certain angle in the machine longitudinal direction with a universal joint. However, the fluctuation of the driving reaction force at this time causes the entire transplanting work section to roll. It will shake in the direction. Here, even if a plurality of drive shafts having different rotation directions are provided in order to cancel the driving reaction force, the driving reaction forces applied to the respective shafts rarely coincide with each other, so that the fluctuation of the driving reaction force cannot be canceled completely.

Further, in such a no-tillage transplanter, the driving force (the size thereof is comparable to the driving force required for traveling) for the rotary groove making device is compared with the ordinary rice transplanter. In order to secure this driving force, which is necessary in addition,
One of the following: a drastic reduction in transplantation speed, a separate engine for driving the grooving device in addition to the running engine, a large horsepower engine for both running and driving the grooving device, etc. You have to choose the means,
There is a problem that the above means is against the demand for labor saving and large scale in recent years because it greatly reduces the transplant efficiency, and the above means is disadvantageous in terms of engine installation space and cost, and in the end, The above means will be adopted.

However, in the no-tillage transplanter equipped with a large horsepower engine, the driving force is dividedly consumed by the grooving device and the traveling portion during the no-tillage transplant, but the grooving is performed during turning. When driving without driving, all driving force will be input to the running part, and in order to withstand this input, it is necessary to significantly increase the strength of the traveling aircraft and the entire drive system, and the aircraft will be larger than necessary. There was a problem that it became heavy. In order to avoid this problem, it is conceivable to install a safety device such as a torque limiter in the input part, but it is difficult to secure the durability of the safety device and the stability of the torque due to the large horsepower and high speed rotation. The drawback is that it becomes complicated.

In view of the current situation of the no-tillage transplanter as described above, the present invention enables power transmission so as not to cause shaking of the entire transplantation work section due to fluctuations in driving reaction force, thereby improving planting accuracy. Another object is to obtain a power transmission mechanism with a safety device that has durability and good torque stability.

[0009]

According to the present invention, there is provided an implanting working portion which is connected to a traveling machine body having front wheels and rear wheels so as to be vertically movable via a support link and can be rolled with respect to the traveling machine body. In the no-tillage transplanter in which the transplanting work section includes a planting device and a rotary grooving device installed in front of the planting device, a power transmission mechanism thereof includes a hydraulic pump driven by an engine installed in a traveling machine body, A hydraulic motor for driving the rotary grooving device and a hydraulic motor for driving the traveling machine body are arranged in series with respect to the hydraulic pump, and the hydraulic motor for driving the rotary grooving device is installed in the transplant work section and The pipe to the motor is configured by a flexible hydraulic hose, and a pressure control valve is arranged in a pipe for guiding pressure oil to the hydraulic motor for driving the traveling machine body. is there. Here, the hydraulic motor for driving the traveling machine body can also serve as the drive for the planting device.

[0010]

The power transmission mechanism according to the present invention comprises two hydraulic pumps, one for a grooving device and one for traveling, which are arranged in series using one hydraulic pump.
The two hydraulic motors are synchronously driven. And, in the power transmission mechanism according to the present invention,
Since the traveling machine body side and the transplant work section side are only connected by a flexible hydraulic hose, the drive reaction force unlike the conventional example does not occur, and the transplant work section does not change even if the load on the groove making device fluctuates. The whole thing isn't shaken. In addition, a pressure control valve is arranged in a conduit for guiding pressure oil to the hydraulic motor for driving the traveling machine body, and this serves as a safety device for limiting the maximum pressure of the hydraulic pressure flowing into the hydraulic motor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to FIGS. 1 and 2. This no-tillage transplanter is supported by a front wheel 1 and a rear wheel 2 as shown in FIG. The traveling machine body A and the transplant work section B are the main components. An engine 3 is installed on the traveling machine body A, and a plurality of rotary grooving devices 4, a planting device 5, a float 6 and the like for grooving a no-till field are installed in the transplanting work section B. Further, the transplanting work section B is attached to the traveling machine body A via the parallel link mechanism 7, and can be vertically moved while maintaining a substantially horizontal state by the elevating mechanisms 8 installed at two places on the right and left sides of the traveling machine body A (as shown in FIG. Position). Since the base portion 7a of the parallel link mechanism 7 is attached to the traveling machine body A in a freely rolling manner, the transplanting work section B can be freely rolled in the traveling machine body A when it is lowered onto the surface of the field.

As shown in the hydraulic circuit diagram of FIG. 1, the power transmission mechanism of the present invention includes a variable displacement hydraulic pump 10 driven by an engine 3 and a hydraulic motor 11 (rotary type) which is rotated by oil discharged from the hydraulic pump 10. (For driving the grooving device 4), a hydraulic motor 12 (for driving the traveling machine body A and the planting device 5) arranged in series with the hydraulic motor 11, and a 4-port 3-position switching valve installed in the pipeline to the hydraulic motor 11. 13,
It is composed of a pressure control valve 14 and the like installed in a pipeline to the hydraulic motor 12. Of these, only the hydraulic motor 11 is installed in the transplanting work section B, and the others are installed in the traveling machine body A, and the conduit connecting the hydraulic motor 11 and the switching valve 13 is a flexible hydraulic hose 15. Reference numeral 16 denotes a drive system including front and rear wheels 1, 2 and a reduction device for transmitting the driving force of the hydraulic motor 12 to the planting device 5.

In addition, in this embodiment, at the same time, the small capacity hydraulic pump 17 is driven by the engine 3 to supply pressure oil to the power steering device 18, and then the hydraulic oil is replenished to the pipeline of the power transmission mechanism. ing. In addition,
In FIG. 1, 19 is a pressure control valve, 20 is a check valve, 21
Is a throttle valve, 22 and 23 are filters, and the part surrounded by the imaginary line shows a commercially available continuously variable hydraulic transmission.

According to this embodiment, since the hydraulic pump 10 is a variable displacement hydraulic pump, acceleration / deceleration and forward / backward traveling of the traveling machine body A can be easily switched, and the switching valve 13
Thus, it is possible to easily switch the groove making device 4 between normal rotation, reverse rotation and driven rotation. That is, at the time of normal planting, the pressure oil discharged from the hydraulic pump 10 is guided to the hydraulic motor 11 through the switching valve 13 to drive the grooving device 4 (when the switching valve 13 is set to either the left or right position, the hydraulic pressure is increased). The motor 11 rotates normally or reversely), the hydraulic motor 1
The return pressure oil from 1 flows into the hydraulic motor 12 via the pressure control valve 14 to drive the traveling machine body A forward and drive the planting device 5.

When only the forward drive of the traveling machine body A is not performed and the planting is not performed, the switching valve 13 is switched to the intermediate position to close the pipe line to the hydraulic motor 11 (the groove making device 4 is driven to rotate), and the hydraulic pump. The pressure oil discharged from 10 is directly guided to the hydraulic motor 12. On the contrary, when the traveling machine body A is driven backward, the pressure oil of the hydraulic pump 10 is discharged in the reverse direction to drive the hydraulic motor 12 in the reverse direction. At this time, the switching valve 13 is set to the intermediate position to close the pipeline to the hydraulic motor 11, and the working oil is directly returned to the hydraulic pump 10. In any of the above cases, the pressure control valve 14 does not exert excessive pressure on the hydraulic motor 12.

[0016]

According to the present invention, since the hydraulic power transmission mechanism as described above is used to drive the grooving device, even if the load on the grooving device changes, the driving reaction force changes. It is possible to obtain a power transmission mechanism with a safety device that does not cause shaking of the entire transplantation work portion, can improve the accuracy of planting, and has durability and good torque stability. Furthermore, since one hydraulic pump is used to drive two hydraulic motors arranged in series, it is possible to obtain a no-tillage transplanter having a simpler structure, which is cheaper than the case where independent hydraulic pumps are provided.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a power transmission mechanism.

FIG. 2 is a side view of the no-tillage transplanter.

[Explanation of symbols]

 A traveling machine body B transplanting work section 4 grooving device 5 planting apparatus 7 parallel link 10 hydraulic pump 11 hydraulic pump for driving grooving device 12 traveling machine body driving hydraulic motor 14 pressure control valve 15 flexible hydraulic hose

Claims (1)

[Claims] 1. A transplantation working unit, which is connected to a traveling machine body having front wheels and rear wheels so as to be vertically movable via a support link and can be rolled with respect to the traveling machine body, wherein the transplanting work section is a planting device. In the no-tillage transplanter equipped with a rotary grooving device installed in front of it, the power transmission mechanism includes a hydraulic pump driven by an engine installed in the traveling machine body, and a rotary operation is performed with respect to the hydraulic pump. A hydraulic motor for driving the groove device and a hydraulic motor for driving the traveling machine body are arranged in series,
The hydraulic motor for driving the rotary grooving device is installed in the transplanting work section, and the conduit to the hydraulic motor is constituted by a flexible hydraulic hose, and the hydraulic motor for driving the traveling machine body is pressurized. A no-tillage transplanter characterized in that a pressure control valve is arranged in a conduit for guiding oil.