JPH0229850Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides a drive mechanism that lifts and lowers the wheels relative to the aircraft, and also ensures that the mounting height of this float is within a set range relative to the ground float attached to the aircraft in a downward biased state. An interlocking mechanism is provided that interlocks the operating section of the drive mechanism 23 so that the operating section is automatically operated to a state where a first flexibility part that allows the operating part to be operated to the neutral position in the state where the operating part is in the neutral position; A walk-behind rice transplanter is provided with a locking interlocking mechanism that locks and interlocks and that can be released and is linked to the operation tool so that it automatically acts when the operating tool is operated to a wheel lowered position. Related to wheel lifting/lowering operation structure.

The above rice transplanter can be used regardless of changes in the depth of the tiller.
Through the action of the interlocking mechanism, the height of the machine from the ground is maintained almost constant, and the plant is constructed so that it can work while keeping the planting depth almost constant, and by simply operating the operating tool to the wheel lowering position at the edge of the field, The wheels are driven to lower the aircraft by the action of the drive mechanism and the locking interlocking mechanism, and when they have descended by a set amount, they are automatically stopped and the aircraft floats above the ground by the set amount, and operations to stop the drive mechanism and lifting are performed. It is constructed so that it can be easily turned while lifting the aircraft without any support operations.

Conventionally, in this seed rice transplanter, after the machine body has been lifted a certain amount, unless the operation tool is returned to the wheel automatic lifting position and the locking interlocking mechanism is operated to release the operation, the ground float Even if the ground pressure increases, the drive mechanism operating part does not switch to the wheel lowering position. Therefore, if the ground float goes deep into the plowing platform when turning, the ground float remains stuck deep in the field mud. As the temperature increases, the movement resistance acting on the grounding float increases,
As the mud pushing by the grounding float becomes more intense, the adverse effects of the flowing mud on the already planted seedlings becomes greater, and it becomes difficult to turn the aircraft.In order to avoid this, the wheels are already lowered so that the aircraft lift drive is performed again. This has caused the inconvenience of requiring the troublesome effort of re-operating an operating tool that has been operated at a certain position.

The purpose of the present invention is to make it possible to prevent the grounding float from remaining deeply sunk in the mud even if the machine goes deep into the plowing ground after performing a levitation operation, without requiring much effort.

The present invention provides a wheel lifting/lowering operation structure for a walking rice transplanter as described above, which includes a second flexible portion that allows the locking interlocking mechanism to be operated to release the operation while the operating tool is in the wheel lowering position. In addition, the locking mechanism is configured to release the action of the ground float when the ground pressure of the ground float increases above a set level, and to operate when the ground pressure of the ground float decreases below the set level. It is characterized by being provided with an automatic operation mechanism linked with a stop interlocking mechanism, and its functions and effects are as follows.

That is, when the float ground pressure increases beyond a set value while the locking interlocking mechanism is in operation, the automatic operation mechanism automatically releases the locking interlocking mechanism. Then, because the grounding float rises relative to the aircraft due to the grounding reaction force, and because the second flexible portion is provided, the interlocking mechanism operates the operating portion to the wheel lowering position. Then, as the wheel is lowered and the float ground pressure falls below the set value, the locking interlocking mechanism is automatically restored to its operating state by the automatic operation mechanism to stop the wheel lowering. In other words, even if the aircraft enters the plowing depths and the grounding float sinks deeply into the mud after performing a levitation operation, the wheels are automatically driven downward until the float grounding pressure becomes less than the set value. Therefore, even if the aircraft goes deep into the plowing ground after performing a floating operation, it is possible to prevent the grounding float from remaining deeply sunk in the mud and the resistance to float movement increasing. This eliminates the need to re-operate the operating tools as in the past, and regardless of the depth of the plowing platform, the machine rotation does not cause the planting seedlings to fall over due to mud pushing by the ground float, and I've become able to do it easily.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a pair of left and right wheels 1, 1,
And, at the rear of the traveling body having the engine 2, the control handle 3, etc., there are two seedling planting devices 4, 4 arranged in parallel in the lateral direction of the body, and a seedling stand for feeding seedlings to these seedling planting devices 4. 5, and a grounding float 6 is attached to the lower part of the traveling body to constitute a walk-behind rice transplanter capable of planting two rows.

The seedling planting device 4 is constructed as shown in FIG.

That is, the first seedling pusher 8, which is U-shaped when viewed in the axial direction of the planting claw 7, is slidably attached to the planting arm 10 via the cylindrical shaft 9 so as to move along the planting claw 7. At the same time, the second seedling pushing tool 11 is inserted into the first seedling pushing tool 8 by the planting claw 7.
It is slidably attached to the planting arm 10 via a support shaft 12 so as to move in the longitudinal direction. In the planting arm 10, the first and second seedling pushing tools 8, 11 can be operated integrally, and there is a stroke difference between the first seedling pushing tool 8 and the second seedling pushing tool 11. cylinder shaft 9 and support shaft 1 so that
2 are connected by a spring 13, and an operating cam 16 for the second seedling pusher swing operating arm 15 connected to the support shaft 12 via a link 14 can be freely rotated integrally with a driving rotation crank 17 for driving the planting arm. At the same time, the first and second seedling pushing tools 8, 1
1 toward the proximal end of the planting claw 7, and a spring 18 that urges the operating arm 15 against the cam 16.
is applied to the operation arm 15, and the planting arm 10
The first and second seedling pushers 8, 11 are slidably driven in conjunction with the seedling planting movement as follows. That is, as the planting claw 7 reaches the seedling planting position, the operating arm 15 is operated to swing against the spring 18, and the rotation preventing portion 9a of the cylindrical shaft 9 relative to the planting arm 10 is rotated. Until the first seedling pushing tool 8 reaches the stroke end where it comes into contact with the stopper part 10a, both seedling pushing tools 8,
11 are both indicated by solid lines from the seedling holding position to the planting claw 7.
After the first seedling pusher 8 reaches the stroke end so that it is slid to the operating position on the tip side, the spring 13 is compressed and deformed, so that the second seedling pusher
Only the seedling pusher 11 is further slid to the second operating position shown by the imaginary line on the tip side of the planting claw 7. In other words, the second seedling pushing tool 11 moves the seedlings to be planted into the first seedling pushing tool 8 so that the seedlings to be planted are not lifted up because the bed soil is pushed into the U-shape of the first seedling pushing tool 8. It is designed to be further extruded from.

As shown in FIGS. 3 and 4, the pair of transmission cases 19, 19 that support the left and right wheels 1 separately are configured to swing up and down around the axis P, and the transmission cases 19, 19 Each operating arm 1
A balance rod 21 connected to the levers 9a and 19a via push-pull rods 20 is connected to the traveling body through a pivot shaft 22 and a hydraulic cylinder 23, which is an example of a drive mechanism, so as to be freely swingable and movable. , so that the left and right wheels 1, 1 integrally swing up and down relative to the machine body in opposite directions so that the machine body becomes almost horizontal regardless of the horizontal inclination of the tiller, and the left and right wheels 1 are moved up and down by hydraulic cylinders 23. , 1 are configured to be able to swing up and down relative to the aircraft body integrally and in the same direction. Then, the swing operation section 25 of the rotary control valve 24 of the cylinder 23 is
The upper end is rotatably connected to the guide member 27 via a connecting tool 26, and the lower end is attached to the guide member 27 so as to be vertically slidable. The first spring 30 is brought into contact with and interlocked with the front end of the grounding float 6, which can freely swing up and down, biasing the grounding float 6 downward, and biasing the operating section 25 to the wheel raised position UP. 25 so that the mounting height of the grounding float 6 is within the set range.
It is configured to be automatically operated by the urging force of the spring 30 and the ground reaction force acting on the ground float 6, and the height of the seedling planting device 4 from the ground is maintained regardless of changes in the depth of the tiller. The wheels 1 are automatically raised and lowered relative to the aircraft so that the planting depth is within the set range, allowing work to be carried out while maintaining the planting depth at a substantially constant level.

The other end side of the operating part operating rod 32 whose one end side is connected to the operating part 25 via the second spring 31,
It is slidably attached to the interlocking tool 33 extending from the balance rod 21 so as to be movable and rotatable integrally therewith so as to be able to move relative to the balance rod 21, and both ends are distributed to both the front and rear sides of the interlocking tool 33. A bracket 34 is slidably attached to the operating rod 32 in the arranged state.
Then, as shown in FIG. 5, the locking tool 35 for the uneven portion 32a in the longitudinal direction of the operating rod 32 is slid in a state where it can be freely engaged and disengaged, and in a state where it is urged toward the engagement side by the third spring 36. A fourth spring 37 is interposed between the interlocking tool 33 and the bracket 34 for interlocking and for setting the wheel lowering amount, and the wheel lowering operation of this spring 37 with respect to the cylinder 23 moves the fourth spring 37 to the neutral position N. A locking interlocking mechanism 38 that locks and interlocks the operating portion 25 in a state in which it is returned to its original position and is operated is provided. That is, when the locking tool 35 is engaged, the lever 21 and the interlocking tool 3 are extended as the cylinder 23 extends to drive the wheel downward.
3, and as the spring compression amount reaches the set value, the operating rod 32 is moved via the spring 37, the bracket 34, and the locking tool 35. 25 is operated from the wheel lowered position DN to the neutral position N. Then, when the locking tool 35 is in the disengaged state, even if the cylinder 23 moves the bracket 34 via the lever 21, the interlocking tool 33, and the fourth spring 37 as the cylinder 23 expands and contracts, the bracket 34 will not be attached to the operating rod 32. Just by sliding against the
The operating section 25 is not operated. Then, the planting clutch 42 is biased to the ON position via the fifth spring 39 and the release wire 40 to the operating portion 25, and via the release wire 41 to the locking tool 35. Arm 4
A lever type manual operating tool 45 is interlocked and connected to each of the controllers 3 and 3 via a release wire 44, and the operating tool 45 is provided in the operating section so as to be swingable.
When set to AUT, the release wire 40 is loosened and the operating section 25 is automatically switched due to the elongated hole 46 provided in the connecting section of the wire 40 to the operating section 25, and the locking tool 35 is at the release position. When pulled, the locking interlocking mechanism 38 is released, and the release wire 44 is loosened, so that the planting clutch 42 is placed in the engaged state.
When the operating tool 45 is set to the second operating position ST, the release wire 40 is pulled and the operating section 25 is moved to the wheel lowering position DN, and the release wire 41 is loosened and the locking tool 35 is moved to the engaged position. When the locking interlocking mechanism 38 is in the operating state and the operating arm 4
3 is pulled to the cutting position OFF, so that the planting clutch 42 is placed in the cutting state. The elastic expansion deformation of the fifth spring 39 allows the operation unit 25, which is manually operated to move the wheel to the lowered position DN, to be operated to the stop position N via the locking interlocking mechanism 38 by the actuated cylinder 23. It is configured so that That is, when the operating tool 45 is in the second operating position ST, the operating section 25
The fifth spring 39, which serves as a first flexibility part, is operated from the wheel lowered position DN to the neutral position N.
The operating tool 45
By simply performing the switching operation, the planting clutch 42 is engaged, and the working state in which the wheels 1 are automatically raised and lowered, and the planting clutch 42 is disengaged, and the machine is in the above working state. The fourth spring 37 is configured to switch to a state for turning the aircraft, in which the wheels 1 are driven downward relative to the aircraft so as to rise above the ground by a set stroke.

When the operating tool 45 is in the second operating position ST, operating the locking tool 35 to the detached position, that is, operating the locking interlocking mechanism 38 to the released state, is the second flexible part. The structure is such that it is allowed by the elastic compression deformation of the three springs 36. Then, the locking tool 35 is attached to the bracket 34.
An arm 48 is swingably attached to the rod 28 via a pivot shaft 47, and a lifting arm 49 extends integrally from the rod 28 so as to be able to rise and fall freely, and has an extending end connected to the swinging arm 48. When the operating tool 45 is in the second operating position ST, the locking tool 35 is connected to the grounding float 6 via the rising force of the grounding float 6 as the grounding float 6 rises relative to the aircraft by more than the set value. The locking member 35 is automatically switched to the disengaged position, and as the grounding float 6 descends below the set level, the locking member 35 is returned to the engaged position by the third spring 36. That is, the automatic operating mechanism 50 consisting of the swing arm 48 and the lifting arm 49 allows the locking interlocking mechanism 38 to be operated at a pressure higher than the setting of the ground pressure of the float 6 even when the operating tool 45 is in the second operating position ST. is automatically deactivated as the amount increases, and
It is connected to the grounding float 6 so that it is automatically operated to the operating state as the ground pressure of the float 6 falls below the setting, and when the machine enters the depth of the tiller after being switched to the state for turning the aircraft. In order to prevent the grounding float 6 from remaining deeply embedded in the mud, the wheels 1 are automatically driven to lower the aircraft body.

The operating tool 45 can be changed to one that is linked only to the operating section 25 and the locking interlocking mechanism 38,
The second operating position ST is referred to as the wheel lowering position ST.

The interlocking between the grounding float 6 and the operating section 25 may be performed by a link mechanism or the like instead of the rod 28.
These are collectively referred to as the interlocking mechanism 28.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel lifting/lowering operation structure of a walking rice transplanter according to the present invention, and FIG. 1 shows a walking rice transplanter,
Figure 2 is a sectional view of the seedling planting device, Figure 3 is a partially cutaway side view of the wheel lifting/lowering operation structure, Figure 4 is a plan view of the interlocking structure of the cylinder and wheels, and Figure 5 is the locking device arrangement. It is a partially cutaway side view of the installation part. DESCRIPTION OF SYMBOLS 1...Wheel, 6...Grounding float, 23...Drive mechanism, 25...Operation unit, 28...Interlocking mechanism, 3
6... Second flexibility part, 38... Locking interlocking mechanism, 39
...First flexibility part, 45... Operating tool, 50... Automatic operation mechanism, DN... Operating unit wheel lowering position, N...
Operation unit neutral position, ST...Operation tool wheel lowered position.

Claims (1)

[Scope of utility model registration request] A drive mechanism 23 is provided for lifting and lowering the wheels 1 relative to the aircraft body, and the installation height of the float 6 is automatically operated to be within a set range with respect to the ground float 6 attached to the aircraft body in a downward biased state. An interlocking mechanism 28 that interlocks the operating section 25 of the drive mechanism 23 is provided, and an operating tool 45 for manually operating the operating section 25 to the wheel lowering position DN, and an operating tool 45 that is located at the wheel lowering position ST. A first flexibility section 39 is provided to allow the operation section 25 to be operated to the neutral position N in a state where the operation section 25 is in a state where the operation section 25 is operated to return to the neutral position N by the wheel lowering operation of the drive mechanism 23. a locking interlocking mechanism 38 that locks and interlocks the operating section 25, the action of which can be released freely;
The wheel lowering position ST of this with respect to the operating tool 45
The wheel lifting/lowering operation structure of a walk-behind rice transplanter is provided in a state in which the wheels are linked so as to operate automatically when the operating tool 45 is in the wheel lowering position ST, and the locking linkage A second flexible portion 36 is provided that allows the mechanism 38 to be released, and the mechanism 38 is released when the ground pressure of the ground float 6 increases above the set level, and the mechanism 38 is released. 6. A wheel lifting/lowering operation structure for a walk-behind rice transplanter, which is provided with an automatic operation mechanism 50 that is linked to the locking interlocking mechanism 38 so as to be operated as the ground pressure falls below the setting of No. 6.