JPS599543Y2 - Walking rice transplanter - Google Patents

Description

[Detailed Description of the Invention] The present invention is based on the vertical displacement of a float that is attached to an aircraft body equipped with propulsion wheels on a single axis so that the aircraft can be moved up and down, so that the ground level of the aircraft body remains approximately constant. This invention relates to a walking rice transplanter in which a wheel lifting device and a float are linked to control the lifting and lowering of the rice transplanter.

In this rice transplanter, when the depth from the mud surface to the hard surface where the propulsion wheels touch the ground changes, this is detected as a relative vertical displacement of the float with respect to the machine body, and the propulsion wheels are controlled to move up and down, increasing the height of the machine body from the mud surface. In other words, since the ground level can be maintained approximately constant, it is possible to perform work with a stable planting depth without requiring any special operations.
On the other hand, when the machine is stopped to replenish seedlings during the planting process, there is a risk that the wheels will be lowered unexpectedly and the machine will be lifted significantly from the mud surface, causing the machine to become unbalanced.

In other words, when the aircraft is equipped with propulsion wheels arranged on a single axis as described above, the propulsion wheels that have entered the mud tend to be rotated backwards around the wheel axis due to the reaction force received from the mud. , the front part of the wheel is usually heavier than the rear part of the wheel to balance the aircraft,
Coupled with the fact that when the aircraft is stopped from a forward planting state, the aircraft tends to rotate forward around the wheel axis due to inertia. As a result, there was a risk that the float would be displaced upward and the wheels would be lowered.

In order to solve the above-mentioned inconvenience, conventionally, as shown in Japanese Patent Application Laid-Open No. 52-75523, an operating force using a dog clutch or the like is used in an interlocking mechanism from a float to a switching valve for controlling wheel elevation. A technique is known in which a cutting-off mechanism is provided and an operating mechanism for manually operating the switching valve in a state where the interlocking relationship between the float and the switching valve is cut off.

With this structure, it is possible to avoid automatic lowering of the wheels when the aircraft stops, and the attitude of the aircraft can be stabilized. Also, the operating force can be reduced as it is not related to the movement of the float. Although it is effective in that it allows
The structure of the operating force intermittent mechanism itself, which utilizes the above-mentioned dog clutch or the like, is complicated, and further simplification of the structure has been desired.

2.The purpose of this invention is to release the connection between the float and the switching valve for wheel elevation control to enable forced elevation of the wheels by manual operation.
The structure for this purpose is significantly simplified compared to the conventional structure described above.

In order to achieve the above object, the present invention features a structure or
Based on the vertical displacement of a float attached to the aircraft body equipped with propulsion wheels arranged on a single axis, the wheels are raised and lowered to control the elevation of the wheels relative to the aircraft body so that the ground level of the aircraft body remains approximately constant. In a walk-behind rice transplanter which links a control switching valve and a float and is provided with a switching mechanism for artificially switching the switching valve to a wheel forced upward state, the switching valve is elastically attached in one direction. The spool is configured by a directional control valve having a biased spool, and the spool and the float are connected to the fuselage fixed part so as to convert the vertical displacement of the float into motion in the sliding operation direction of the spool and transmit the motion. The connecting portion of the L-shaped arm on the spool side is provided with an elastic biasing force that controls the upward displacement of the float. A flexible interlocking section is formed to transmit the force to the spool against the force and to allow movement of the spool by operating the switching mechanism toward the wheel forced upward movement, regardless of the interlocking relationship with the float.

The effects of the above structure are as follows.

In other words, when stopping the aircraft from the forward planting state, the wheels can be forcibly raised.
Of course, it is possible to avoid the above-mentioned problem of the wheels being lowered and the aircraft becoming unbalanced, but as a mechanism for this purpose, it is possible to avoid the conventional complex-structured dog clutch type operation force intermittent mechanism. Instead, the overall structure can be simplified by using an L-shaped arm with a simple structure and providing a flexible interlocking section at the connection between the L-shaped arm and the spool. That's what I got.

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

The illustrated walk-behind rice transplanter has an engine 2 and a main transmission 3 directly connected to the front end of a longitudinally long frame 1 placed in the left and right center of the machine, and a seedling planting device 4 for planting three rows at the rear of the frame. A control handle 5 is provided, and the lower side of the engine 2 and the main mission case 3,
A front float 6 made of hollow plastic or resin and a pair of left and right rear floats 7, 7 are provided on the lower side of the seedling planting device 4, and furthermore, front and rear floats}6, 7. A pair of propulsion wheels 8, 8 are located on the outer side of the fuselage, which corresponds to the middle of 7.
It is supported via transmission cases 9, 9 extending rearward from the main transmission case 3.

The seedling planting device 4 includes a rear inclined seedling platform 10 that is laterally reciprocated with a constant stroke, and a horizontally juxtaposed seedling platform that operates vertically in circulation between the lower end of this seedling platform 10 and the mud. It consists of three planting claws 11... and a seedling pusher 12 that is driven to move forward and backward along the direction of the claw blades of the claws 11.

The rice transplanter constructed in this way has a flow before and after sliding on the mud surface}6, 7. 7 and the propulsion wheels 8, 8 that follow the hard ground in the field, the seedling planting device 4 moves while the machine is floating and supported on the mud surface.
Seedlings are taken out one by one along the lower end row of the seedlings placed on the seedling stand 10, and the seedlings are supported by the cooperation of the claws 11 and the pusher 12. Bring it into the mud,
A seedling pusher 12 that protrudes from the nail base side to the nail tip side.
The system is designed to sequentially plant three rows of seedlings while extruding and separating the seedlings.

Next, the elevating device for the propulsion wheels 8, 8 will be explained based on FIGS.

That is, a double-acting hydraulic cylinder 1 is mounted on the frame 1.
3 is fixed, and an arm 15 is provided which is moved and operated by this hydraulic cylinder 13 along a slide rail 14 in the longitudinal direction of the aircraft, and this arm 15 and the transmission cases 9, 9 connect connecting rods 16, 16. connected via.

The main mission case 3 includes a pump 17 that sucks and discharges lubricating oil inside the case, and a directional control valve 18 (Fig.
A cylinder control unit 19 is directly connected to the cylinder control unit 19 in which the cylinder control unit 19 (see C) is incorporated, and the oil discharged from this unit 19 is supplied to the cylinder
3.

When the spool 18a of the switching valve 18 is pushed into the state shown in FIG.
When 8a is pulled out to the state shown at the opening in Figure 4, the cylinder 13 is extended and the wheels 8, 8 are lowered, and the spool 18a is moved between the opening in Figure 4 and the opening in Figure 4. In this state, the wheels 8, 8 stop moving up and down.

At this time, the pressure oil from the pump 17 is configured to be short-circuited and flowed into the main transmission case 3 through the relief valve 26.

Next, even if the depth from the mud surface to the hard ground changes, the planting depth is always maintained within a certain range as described below.

That is, the front end of the front float 6 is pivotally supported to the lower part of the engine 2 so as to be vertically swingable, and the rear end is connected to the machine frame via the bending link 20 so as to be vertically displaceable. It is configured to be able to swing vertically with respect to a portion closer to the front of the fuselage than the wheels 8, 8.

Moreover, the spool 18a and the main mission case 3
One end of the L-shaped arm 21 which is pivotally supported by the L-shaped arm 21 is connected to the long hole 21a as a flexible interlocking part in a state where the L-shaped arm 21 is connected and flexibly connected, and the rear part of the front float 6 and the L-shaped arm 21 are The other end of the spool 18a is interlocked with the other end via a rod 22, and the spool 18a is elastically biased toward the state shown in FIG. 4A.

Based on the vertical displacement of the front float 6, the wheels 8, 8 are raised and lowered relative to the body so that the ground level of the body remains substantially constant.

In other words, when the wheels 8, 8 are set at an appropriate vertical position in contact with the hard ground in the field and the machine is traveling for planting, when it reaches a deep part of the hard ground, the wheels 8, 8 sink and the entire machine body also descends. Then, the front float 6 floating on the mud surface is swung upward relative to the aircraft body, and as a result, the rod 2
2 pulls out the spool 18a via the L-shaped arm 21 to the state shown in Figure 4, lowering the wheels 8, 8.Conversely, when the hard disk becomes shallow, the wheels 8, 8 Along with the uplift, the entire body of the machine also rises, and the front float 6 floating above the mud surface is swung downward by its own weight relative to the body, and as a result, as the rod 22 moves downward, the spool 18 a is pushed into the state shown in Fig. 4A by the elastic biasing force, raising the wheels 8, 8, and by raising and lowering the wheels 8, 8 in a timely manner, the ground level of the aircraft is raised. It is maintained approximately constant.

Further, the wheels 8, 8 are connected to a swing lever 2 provided at the rear of the aircraft body.
3, the above-mentioned automatic elevation control state, forced descent state,
and is prepared to be switched to a forced ascent state.

That is, another L-shaped arm 24 is pivotally supported on the main mission case 3, and one end of this arm 24 and the spool 18a are interlocked and connected with each other through an elongated hole 24a for flexibility. At the same time, the other end of the arm 24 and the lever 23 are interlocked and connected via a nose wire 25.

Then, when the lever 23 is operated to the forwardmost position i to relax the release wire 25, the long hole 24a allows the L
The connection between the mold arm 24 and the spool 18a is cut off, and the above-mentioned automatic lifting control state appears, and the lever 23 is operated from the forwardmost position i to the rear intermediate position ii to move the L-shaped arm 24 to the third position. As the spool 18a is switched to the state shown in Figure 4 by swinging it as shown by the imaginary line in Figure 4,
A forced lowering state of the wheels 8, 8 appears, and furthermore, the lever 2 is pressed down.
3 from the intermediate position ii to the rearmost position iii, and the spool 18a is switched to the state shown in FIG. A shortened forced rise state is intended to appear, and in this forced rise state, the connection between the L-shaped arm 21 and the spool 18a is severed due to the accommodating action of the elongated hole 21a. It is structured.

Note that the wheel forced lowering state occurs when the floats 6, 7. 7 is used to lift the aircraft so that it does not touch the ground.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking rice transplanter according to the present invention, and the first
The figure is a side view, the second figure is a schematic plan view of the wheel lifting device, and the third figure is a schematic plan view of the wheel lifting device.
The figure is a side view showing the relationship between the wheel lifting device and the float.
Figures 1 and 2 are schematic diagrams showing the switching state of the switching valve. 6...Float, 8...Curved propulsion wheel, 18...
...Switching valve, 18a... Spool, 21... Curved L-shaped arm, 21... Flexibility interlocking part, 23... Curved switching mechanism. a

Claims (1)

[Scope of utility model registration request] The wheels 8 are controlled to move up and down relative to the aircraft body so that the ground level of the aircraft body remains approximately constant based on the vertical displacement of a float 6 that is attached to the aircraft body equipped with propulsion wheels 8 on a single axis so as to be vertically displaceable. A walk-behind rice transplanter is provided with a switching mechanism 23 for linking a switching valve 18 for wheel elevation control and a float 6, and for artificially switching the switching valve 18 to a wheel forced elevation state. 18 is constructed by a directional switching valve having a spool 18a elastically biased in one direction, and the spool 18a and the float 6 are connected to each other so that the vertical displacement of the float 6 is controlled by the sliding movement of the spool 18a. L-shaped arm 2 pivotably attached to the fuselage fixed part so as to convert and transmit motion in the operating direction
1, and furthermore, the L-shaped arm 21 is connected to the spool 18a at the connecting portion on the side of the spool 18a, and is connected to the spool 18a against the elastic biasing force to resist the upward displacement of the float 6. A flexible interlocking section 21 a for transmitting the information and allowing movement of the spool 18 a by operating the switching mechanism 23 toward the wheel forced upward movement regardless of the interlocking relationship with the float 6.
A walking rice transplanter that is characterized by a formal precept.