JPH025689Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a machine body in which a seedling planting device is connected and a control handle is extended to the rear, and wheels that can be driven up and down via a hydraulic actuator are installed on the machine body, and A device for detecting a level with respect to the planted mud surface is attached, and a control valve for the hydraulic actuator and the detection device are linked, and the level of the aircraft with respect to the planted mud surface is set within a range based on the detection level by the detection device. an elevation control mechanism that automatically switches the control valve so as to maintain the control valve within the range, and
Switching the control valve between a neutral position and a position that allows operation of the elevation control mechanism and a second position that forcibly raises the aircraft by lowering the wheels in preference to the elevation control mechanism. The operating levers are freely linked, a biasing mechanism is attached to the operating levers, and the operating levers are maintained biased in the first and second positions by reversing the biasing direction during the operation. Regarding walking rice transplanters.

When this type of rice transplanter makes a turn on a headland, etc., the machine must be lifted to raise the seedling planting device and its attached float from the planting mud surface. In order to reduce the lifting amount, the actuator is operated by operating the lever to forcibly lift the aircraft, and the lever is held at the neutral position while the aircraft is raised by the desired amount.

Conventionally, in order to hold the lever at the neutral position, for example, a locking pin attached to the lever side is inserted and locked into a locking hole provided on the lever guide. However, if the aircraft is lifted a little too high, the seedling planting device and the float attached to it will float above the planting mud surface, and this will not be a big problem. There is a problem of pushing the mud and knocking down the already planted seedlings, and even if the raising operation is performed once, the actual situation is that a minute raising operation is required. This had the disadvantage that the pin had to be removed from the locking hole, which required time and effort to operate.

Based on the above-mentioned circumstances, the present invention aims to make it possible to perform a forced lifting operation of the aircraft when turning on a headland, etc., in a state where the slight lifting operation can be performed easily and quickly.

In order to achieve the above object, the present invention provides the above-mentioned walk-behind rice transplanter with an operation path that linearly connects the first position and the second position on the guide member of the operation lever, and the operation path. A preliminary raising operation path is provided which starts at the neutral position and ends at a preliminary raising operation position closer to the neutral position than the second position, and The lever is attached to the operating lever in a state where the biasing direction is reversed between the operating position and the second position, and the lever is moved toward the operating path side by the biasing force of the biasing mechanism at the neutral position. It is characterized by being equipped with a holding mechanism that abuts and prevents displacement.

In other words, when turning on a headland, etc., the aircraft is forcibly lifted by lever operation, and then the holding mechanism is held in the neutral position to maintain the aircraft in the lifted state, but the amount of lift is insufficient. By operating the lever in the preliminary raising operation path, the biasing mechanism will return and hold the lever to the neutral position as the hand is released, reducing the hassle of holding and releasing the lever in the neutral position. It has become possible to easily and quickly perform minute lifting operations using hands, fingers, etc., without going back.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A pair of left and right wheels 1, 1 is connected to a hydraulic actuator 2.
It is attached to the fuselage 3 so that it can be driven up and down via the
A control handle 4 is extended behind the handle 4, and a seedling stand 5 and a seedling planting device 6 are installed in front of the handle 4.
A walking type rice transplanter is constructed by providing a soil leveling float 7 below the seedling planting device 6.

The left and right wheels 1, 1 are mounted on transmission cases 8, 8 which are pivotally connected to the body 3 so as to be able to swing up and down about a left-right axis P of the body. A support stand 9 is provided on the fuselage 3 so as to be slidable only in the longitudinal direction of the fuselage, and the hydraulic actuator 2 is mounted on the support stand 9.
are connected. A mounting member 10 is provided on the support base 9 so as to be swingable around the vertical axis Q, and both ends of the mounting member 10 and both transmission cases 8,
The arm portions 8a, 8a protruding from each of the
The left and right wheels 1, 1 are connected via rods 11, 11, and regardless of the inclination of the tiller in the left-right direction of the machine body, the left and right wheels 1, 1 automatically move up and down against the machine body 3, and the seedling planting device 6
The machine body 3 is configured to be driven to move up and down relative to the planting mud surface by driving expansion and contraction of the actuator 2 while maintaining the machine body in an attitude substantially parallel to the planting mud surface.

A sensor float 12 as a detection device for detecting the level of the fuselage 3 relative to the planting mud surface is installed at the lower front of the fuselage 3 so as to be able to swing up and down around the left-right axis axis _P1 of the fuselage on the front end surface. The rear end of 12 and the spool 13 of the control valve V for the hydraulic actuator 2 are linked via a link mechanism 14, and the valve V is automatically switched in accordance with the level displacement of the sensor float 12 relative to the body 3. Regardless of changes in the level of the machine body 3 with respect to the planting mud surface due to changes in the plowing platform, the level of the sensor float 12 with respect to the machine body 3, that is, the level of the seedling planting device 6 with respect to the planting mud surface is set. The elevation control mechanism 15 is configured to maintain the temperature within the range.

Bringing it close to the intermediate swing link 14a constituting the link mechanism 14 and pressing it in contact,
An angular swinging arm 16 for operating the valve V only in the upward operation side is provided, and an operating lever 19 is movably connected to the swinging arm 16 via a release wire 17 and a swing rod 18. The lever 19 is
It is attached to a control box 21 connected to a hand frame 20 on the back side of the seedling stand 5 so as to be swingable along a guide member 22, and
The swing axis A of the operating lever 19 and the lever 19
The connecting position B of the outer wire 17a of the release wire 17 and the fixing position C of the outer wire 17a of the release wire 17 are arranged in a predetermined relative relationship, and the lever 1
9 is in the first position D for the lowering operation that allows the operation of the elevation control mechanism 15, and this state is stably maintained by the biasing force of the compression spring 23 interposed on the swing arm 16 side of the release wire 17. On the other hand, when the aircraft body 3 is operated to the second position U for a forced lift operation with priority over the lift control mechanism 15, this state is stably maintained by the urging force accompanying the weight of the sensor float 12. It has been done.

Mounting structure of the lever 19, release wire 17 and spring lever 18, and compression spring 2
3. A biasing structure using the weight of the sensor float 12 is called a biasing mechanism.

In addition, as this biasing mechanism, for example, the lever 1
9 may be directly attached with a spring.

Close to the lever 19, at a neutral position and at a dead center position for reversing the biasing direction described above.
The stopper 24 is swingably provided so as to act at a location closer to the lowering operation position D than DP, and in its operating position, when turning around a headland, etc.
After lifting the fuselage 3 by a desired amount by operating the lever 19, the lever 19 is brought into contact with the stopper 24, and the holding mechanism 2 is moved so as to resist the biasing force due to the weight of the sensor float 12 and hold it in the neutral position.
It consists of 5.

The stopper 24 and the operating tool 27 attached to the left grip part 26 of the handle 4 are connected via the release wire 28, and the operating tool 27 is operated while holding the handle 27, and the outer wire 28a of the release wire 28 is connected. A release mechanism for the holding mechanism 25 is provided so that the stopper 24 is swung to the non-operating position by the pushing operation, and the lever 19 is automatically swung to the lowering operation position D by the urging force caused by the weight of the sensor float 12. It consists of 29.

In the guide member 22, an operating route R 1 is provided that linearly connects the first position D and the second position U, and the operating route R ₁ is offset parallel to the operating route R ₁ .
A preliminary raising operation path R ₂ is provided starting from the neutral position held by the stopper 24 .

A stepped portion is attached to the guide member 22 at a location closer to the neutral position than the second position U and within a range in which the valve V can be raised, thereby forming the preliminary raising operation path.
A pre-lifting operation position U' is formed as the end of _R2 .

In the biasing mechanism, its dead center position DP is
It is set between the preliminary raising operation position U' and the second position U, and the biasing direction is reversed there, and when the lever 19 is released after being operated to the preliminary raising operation position U', , so that it automatically swings back to the neutral position.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind rice transplanter according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a side view of the main part, Fig. 3 is a plan view of the main part, and Fig. 4 is a side view of the main part. FIG. 5 is a partially cutaway side view of the control box, and FIG. 6 is a plan view of the main portion of FIG. 5. 1...Wheel, 2...Hydraulic actuator, 3...
...Airframe, 4...Handle, 6...Seedling planting device, 1
2...Detection device, 15...Elevation control mechanism, 19...
...Operation lever, 22...Guide member, 25...Holding mechanism, V...Control valve, _R1 ...Operating route, _R2 ...Preliminary rise operating route.

Claims (1)

[Scope of utility model registration request] A machine body 3 with a seedling planting device 6 connected thereto and a control handle 4 extended to the rear is provided with wheels 1 that can be driven up and down via a hydraulic actuator 2, and the machine body 3 is provided with wheels 1 that can be driven up and down to adjust its level with respect to the planting mud surface. At the same time, a control valve V for the hydraulic actuator 2 and the detection device 12 are connected, and the level of the body 3 relative to the planting mud surface is set based on the detection level by the detection device 12. an elevation control mechanism 15 that automatically switches and operates the control valve V to maintain the control valve V within a range, and a first position of the control valve V that allows operation of the elevation control mechanism 15; An operating lever 19 is linked to a second position in which the aircraft body 3 is forcibly raised by lowering the wheels 1 in preference to the elevation control mechanism 15, and the operating lever 19 is attached to the operating lever 19 so as to be freely switchable between the neutral position. A walk-behind rice transplanter is provided with a biasing mechanism and configured to maintain biasing of the operating lever 19 in the first and second positions by reversing the biasing direction during the operation, the operating lever 19 The guide member 22 is provided with an operating route R ₁ that linearly connects the first position and the second position, and an operating route R ₁ that is offset from the operating route R 1 and has the neutral position as the starting end, and the second position A preliminary raising operation path _R2 is provided that terminates at a preliminary raising operation position closer to the neutral position than the neutral position, and the biasing direction of the biasing mechanism is reversed between the preliminary raising operation position and the second position. At the same time, the lever 1 is attached to the operating lever 19 in a state in which the lever 19 is attached to the operating lever 19 in a state in which
9. A walking rice transplanter characterized in that a holding mechanism 25 is attached for abutting and preventing displacement of the rice transplanter ₉ toward the operation path R1 side.