JPH034165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seedling transplanter used in rice fields, and is intended to improve the turning performance of the machine in headlands.

(Prior Art) In this type of seedling transplanter, the running wheels roll on the tiller and move forward, and along with this, the float slides up and down on the mud surface. After this float slides, the seedling planting device transplants the seedlings.

In rice paddies, the depth of the plow from the mud surface varies, and in order to accommodate this, a sensor float is used as a float, and its up and down movement activates a drive device, which in turn moves the running wheels up and down. By moving the machine, the height of the machine relative to the mud surface is kept constant, and the seedlings are planted at a uniform depth using the seedling planting device.

At this time, if the running wheels move up and down quickly, it will be difficult to drive, so the movement is slowed down within the allowable range. When reaching the headland, use the handle to lift the rear of the aircraft and bring the tip of the sensor float closer to the aircraft. Then, the sensor float goes up and the drive device pushes down the traveling wheels, so the aircraft body rises from the mud surface and the seedling planting device rises from the mud surface, which is convenient for turning. However, if the up and down movement of the traveling wheels is slow, the end of the sensor float will enter the mud when the rear part of the aircraft is lifted by the handle, and as it turns, the sides will turn the mud and disturb it.

(Problem to be solved by the invention) The applicant proposed a countermeasure to this problem in Japanese Patent Application Laid-open No. 160909/1983. However, this countermeasure was unstable and difficult to put into practical use because the drive device was hydraulic and the valve that operated it was a friction type that was pressed against and released from the machine wall using a spring.

As a result of our research, we have improved the system to be more stable by selecting two springs.

(Means for Solving the Problems) That is, the present invention provides a seedling planting device installed at the rear of the fuselage to which engine power is transmitted via a planting clutch, and a seedling planting device installed after the seedling planting device and connected to the rear of the fuselage. A handle that can lift the machine, a pair of running wheels that are installed on both sides of the machine and are moved up and down by a drive device, and a pair of running wheels that are attached so that the tips are in front of the preceding wheels, and the tips move up and down while moving up and down the mud surface. It is equipped with a sensor float that slides on the ground, and a switching device that changes the sensitivity with which the running wheels move up and down.The difference between the sensor float and the running wheels is that when the sensor float moves up and down, the drive wheels move up and down in the opposite direction. The sensitivity switching device is made of a pair of hard springs and soft springs, and when the planting clutch transmits power, the hard spring and soft spring act to suppress the vertical movement of the running wheels, and This seedling planting machine is characterized in that only a soft spring acts on the side that suppresses the vertical movement of the traveling wheel by power disconnection using a clutch.

(Function) This invention is configured as described above, so when it is operated in a paddy field, the running wheels roll on the plowing platform with the power of the engine, the machine moves forward, and the sensor float moves on the mud surface. glide. Power from the engine is then transmitted to the seedling planting device via the planting clutch, where the seedlings are inserted into muddy soil and transplanted.

Here, if the plowing platform is deep relative to the mud surface, the aircraft will descend toward the mud surface, and conversely, the sensor float will move closer to the aircraft.
That is, the sensor float rises relative to the aircraft body.
The signal then activates the drive system, pushing down the wheels, lifting the aircraft off the mud surface, and lowering the sensor float to its normal position.

Conversely, if the plowing platform is shallow relative to the mud surface, the aircraft will rise above the mud surface and the sensor float will descend relative to the aircraft.
Then, the drive unit brings the traveling wheels closer to the aircraft,
The aircraft will descend to the mud side and will be at a normal distance from the sensor float.

When the seedling transplanter reaches the headland, the operator disengages the planting clutch to stop the seedling transplanter, lifts the handle and tilts the machine forward, lifts the seedling transplanter off the mud surface, and turns ( make a U-turn).
Then, since the tip of the sensor float sticks out in front of the running wheels, it approaches the aircraft due to the tilt of the aircraft, and when the sensor float rises, it emits a signal, and that signal causes the drive device to push down the running wheels. , the aircraft lifts off the mud surface. Here, the hard springs are separated from these paths due to the disconnection of the transmitted power by the planting clutch, and the drive unit is actuated by the signal transmitted against the soft springs, so that the traveling wheels can be used for planting work. Go down quickly compared to inside.

When the turn is complete, push down on the handle to level the aircraft and engage the planting clutch. Then,
The sensor float is lowered and the traveling wheel is raised, and a hard spring and a soft spring act on the operating path of the sensor float and the drive device, making the vertical movement of the traveling wheel relatively slow.

(Effects) As described above, according to the present invention, the machine body is automatically maintained at a constant height from the mud surface, regardless of fluctuations in the tiller relative to the mud surface, thereby making the planting depth of seedlings uniform. I can do it. In addition, the vertical movement of the running wheels for this purpose operates suitably slowly, reducing operator fatigue. Furthermore, when turning on a headland, the traveling wheels move quickly, so if the front of the aircraft is lowered, the aircraft immediately lifts off the mud surface, and the sensor detects that the front of the aircraft has been lowered. The plunge of the tip of the float into the mud is quickly resolved, and the aircraft can turn without the mud pushing against the sides of the sensor float.

Since this switching is performed by selecting a hard spring in addition to a soft spring, the stability is much better than the conventional friction force type.

(Example) Next, an example will be explained.

8 is a seedling planting machine, and an engine frame 10 is provided in front of a traveling transmission case 9, and an engine 11 is attached thereto. A transmission case 12 that also serves as a frame is provided at the rear of the traveling transmission case 9, and a planting section transmission case 13 is fixed to the rear of the transmission case 12, and a pair of planting rods 1 are installed on the left and right under the transmission case 13.
Seedling tank 1 with 5 and 15 moving left and right
Cut out the seedlings from the lower end of 4 and set them up for transplanting. That is, the seedling planting device is mainly composed of the planting rods 15, 15 and the seedling tank 14, and the power of the engine 11 is transmitted through a planting clutch (not shown). Further, a pair of left and right handles 16L and 16R extend from the planting section transmission case 13 behind the seedling tank 14, and the seedling tank 14 is supported by a connecting rod 17. The leading ends of the left and right transmission cases 1L, 1R, which are long in the front and rear, are rotatably attached to the traveling transmission case 9, and traveling wheels 2L, 2R are provided on the outside thereof, respectively.

Reference numeral 18 designates a central float whose rear part is pivotally supported by the fuselage, and whose front part is suspended from the transmission case 12 by a link mechanism 19, so that it slides on the mud surface at the rear of the center of the fuselage.

5L and 5R are sensor floats, the rear part of which is pivotally supported on the aircraft body in front of the central leveling float 18, and rotatable float supports are provided on both left and right sides of a shaft 20 supported on the engine frame 10, as shown in FIG. Rod 2
1L, 21R and arms 22L, 22R constitute rotating bodies 23L, 23R, the front portions of which are supported by float support rods 21L, 21R.

3L and 3R are drive devices, which are hydraulically configured in the figure and are activated by the vertical movement of the front portions of sensor floats 5L and 5R via rotating bodies 23L and 23R, connecting rods 24L and 24R, and valve arms 25L and 25R. By operating the hydraulic switching valves 4L and 4R, pressure oil is supplied from the hydraulic pumps 26L and 26R, and the pressure oil in the cylinders is discharged to the tank 27, so that the traveling wheels 2
Hydraulic cylinder 2 that moves L and 2R up and down, respectively.
8L and 28R.

The hydraulic cylinders 28L and 28R are attached to both ends of a leaf spring 29 fixed to the front part of the engine frame 10. Also, 30L, 30R
is a connecting member that connects the transmission cases 1L, 1R with the tips of the rams 31L, 31R, which move in and out according to the hydraulic pressure of the hydraulic cylinders 28L, 28R.

6L and 6R are soft springs that bias the sensor floats 5L and 5R in the downward movement direction, and both ends of the springs are connected to the upper ends of the valve arms 25L and 25R and the U-shaped rotating body 3.
The rotating body 34 is stretched between the lower end of the
It is rotatably attached to stays 32, 32 protruding from the fuselage by a shaft 33.

7L and 7R are hard springs that bias the sensor floats 5L and 5R in the downward direction; soft springs 6L and
The spring constant is made larger than 6R, and like the soft springs 6L and 6R, the valve arm 25
It is stretched between L, 25R and the U-shaped rotating body 34.

Reference numeral 35 denotes a sensitivity adjustment lever located near the operator between the handles 16L and 16R at the rear of the aircraft.
6, the U-shaped rotating body 34 is rotated, and the tensile force of the hard springs 7L, 7R is changed to adjust the vertical movement of the sensor floats 5L, 5R.

37 is a planting clutch lever provided near the sensitivity adjustment lever 35, and by operating the planting clutch lever 37 in the C direction around the pivot shaft 38, the planting clutch is connected via a wire 39. The planting clutch is disengaged by operation in two directions, and one end of the planting clutch lever 37 is connected to one end of the outer 36a of the wire 36 of the sensitivity adjustment lever 35. Therefore, when the planting clutch lever 37 is operated in the direction C and the planting clutch is connected, the soft springs 6L, 6R and the hard springs 7L, 7R act together, as shown in FIG. (a state in which the sensor floats 5L and 5R are biased in the downward direction), but the planting clutch lever 3
7 is operated in the two directions and the planting clutch is disconnected, the outer 36a of the wire 36 moves in the E direction, so the tensile force of the hard springs 7L and 7R acts on the U-shaped rotating body 34. The spring constant is adjusted to the position where the hard springs 7L and 7R do not move (the position where the tips 40L and 40R of the hard springs 7L and 7R rest in the middle of the long holes 41L and 41R provided in the U-shaped rotating body 34). Only the soft springs 6L and 6R, which have a small diameter, are in operation. In addition, the soft spring 6L at this time,
The tensile force of 6R is determined by the sum of the tensile force and the force for rotating the left and right valve arms 25L, 25R due to the weight of the sensor floats 5L, 5R in the suspended state, which is greater than the switching resistance force of the hydraulic valves 4L, 4R. is also set to be slightly larger.

Next, the action will be explained.

When a pine-shaped seedling with soil is placed in the seedling tank 14 and the engine 11 is started to rotate each part to start seedling planting work, the traveling wheels 2L and 2R roll on the tiller of the paddy field. The aircraft moves forward.

In addition, the sensor floats 5L, 5R and the center float 18 slide on the muddy surface of the paddy field, and the seedling planting rod 15 moves back and forth from side to side, cutting off seedlings in the seedling tank 14 one by one and transplanting them onto the leveled muddy surface. do.

During work, when the depth of the plow changes from side to side and from front to back, the supporting force of the traveling wheels 2L, 2R changes, so the ground pressure of the sensor floats 5L, 5R sliding on the mud surface changes. Therefore, when the tiller becomes deeper, the sensor floats 5L and 5R are pushed up, and when the tiller becomes shallower, they move down to hang. When the left and right tillers change to shallow or deep at the same time, the left and right sensor floats 5L and 5R move up and down simultaneously, and when one of the tillers changes, the machine body tilts and moves up and down in opposite directions.

In any case, the sensor floats 5L and 5R move up and down in response to such changes in the tiller.

At this time, if the sensor floats 5L, 5R are pushed up beyond a certain level, the rotating bodies 23L, 23R, the connecting rods 24L, 24R, and the valve arms 25L, 25
The hydraulic switching valves 4L and 4R are connected to the ram 31 via R.
Switch to the side where L and 31R protrude, and connect the connecting member 30
The running wheels 2L, 2R are moved downward via L, 30R and transmission cases 1L, 1R.

Conversely, when the tiller becomes shallow and the sensor floats 5L and 5R move downward beyond a certain level, the rams 31L and
The hydraulic switching valves 4L and 4R are switched so that the wheel 31R is retracted, and the running wheels 2L and 2R are moved upward.

In this way, the running wheels 2L and 2R are automatically controlled up and down depending on the shallowness and depth of the tiller, and the ground pressure of the sensor floats 5L and 5R is always maintained within a certain range of pressure appropriate for seedling planting work. Furthermore, since the left and right running wheels 2L and 2R are independently controlled, the machine does not run tilted to the left or right, and the planting depth of the seedlings can be adjusted to the left and right seedling planting tools 15, 2R. 15
Nothing that changes will happen.

During the above-mentioned work, the drive devices 3L and 3R are operated separately, but at this time, since the base sides of the hydraulic cylinders 28L and 28R are supported by a leaf spring 29 that can be bent in the front and rear direction, the There is little vibration, the running wheels 2L, 2R move up and down extremely smoothly, accurately follow the plowing surface, and are propelled with little slip.

Depending on the field conditions, the sensitivity adjustment lever 35 can be used to adjust the sensor float 5 depending on the hardness or softness of the mud.
By adjusting the sensitivity of the vertical movement of L and 5R, the vertical movement of the running wheels 2L and 2R is controlled to be suitable for the field, and good running performance and planting performance can be obtained.

When turning in the reciprocating planting process, the planting clutch is disconnected by the planting clutch lever 37 just before turning, and by operating the planting clutch lever 37 in two directions, the spring constant can be adjusted as described above. Since the large hard springs 7L and 7R no longer work, the sensor floats 5L and 5R move upward sensitively, and with a light force the front of the aircraft approaches the mud surface, causing the front of the sensor floats 5L and 5R to move closer to the aircraft. The wheels 2L and 2R are pushed down, and the aircraft floats up and turns easily.

In the above embodiment, the soft springs 6L, 6
R is provided by being stretched between the left and right interlocking mechanism which separately interlocks the sensor floats 5L and 5R and the left and right hydraulic pressure switching valves 4L and 4R and the U-shaped rotating body 34,
Alternatively, it may be provided in a stretched manner between the left and right interlocking mechanism and the fuselage (for example, the support stays 32, 32 or the shaft body 33 fixed to the fuselage). Furthermore, although a walk-behind two-row rice transplanter has been described, a rice transplanter with four or more rows may also be used.

[Brief explanation of drawings]

The figure shows a rice transplanter to which the present invention has been applied; Fig. 1 is its plan view, Fig. 2 is its enlarged front view, Fig. 3 is its partial perspective view, and Fig. 4 is its hydraulic circuit diagram. . The symbols in the figure are as follows. 1L, 1R...Transmission case, 2L, 2R...Traveling wheel, 3L, 3R...Drive device, 4L, 4R...
... Hydraulic switching valve, 5L, 5R ... Sensor float, 6L, 6R ... Soft spring, 7L, 7R ... Hard spring, 11 ... Engine, 16L, 16R ...
handle.

Claims (1)

[Claims] 1. A seedling planting device installed at the rear of the fuselage to which engine power is transmitted via a planting clutch, a handle installed after the seedling planting device to lift the rear of the fuselage, and a drive device installed on both sides of the fuselage. A pair of running wheels that are moved up and down by a sensor, and a sensor float that is attached so that its tip is in front of the preceding wheel and slides on the mud surface while its tip moves up and down.
Equipped with a switching device that changes the sensitivity with which the running wheel moves up and down, the sensor float and the running wheel are connected in such a way that when the sensor float moves up and down, the drive wheel moves up and down in the opposite direction, and the sensitivity changes. The switching device is made up of a pair of hard springs and soft springs.The planting clutch transmits power, and the hard spring and soft spring work to suppress the vertical movement of the running wheels, while the planting clutch cuts off the power and softens the spring. A seedling planting machine characterized in that only springs are provided to work on the side that suppresses the vertical movement of the running wheels.