JPH035764B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a self-propelled aircraft having one running wheel, and a pair of left and right ground floats connected to the left and right sides of the aircraft from the wheels. The floats are arranged so that they can be raised and lowered separately, and the drive mechanism for raising and lowering the wheels is linked to each of the pair of floats so that the mounting height of the floats is automatically operated to be within a set range. A linking mechanism is provided in which the driving mechanism is operated to raise and lower the wheel by raising and lowering both of the pair of floats to the same side beyond the set range, and the linking mechanism operates the wheel tiller. In order to ensure that the working depth of seedling planting, sowing, fertilization, etc. is maintained almost constant regardless of entering into depressions and riding up on convex parts of the tiller, the left and right floats are The present invention relates to a traveling type paddy field working vehicle that is configured so that its wheels are not raised or lowered even if they are raised or lowered independently or in opposite directions in order to prevent changes in the working depth caused by this.

[Conventional technology]

In the case of a single-wheeled mobile paddy field work vehicle, the inner side of the wheel is generally lowered so that it is easier to maneuver in a small radius when turning the machine at the edge of the field.
Additionally, the aircraft is tilted into a forward-downward position. If the wheels are kept at the working height in this tilted position, the inner side of the front end of the fuselage will become extremely low, making it easy to get muddy. In order to easily avoid this mud stain, in order to lower the wheels relative to the aircraft and raise the aircraft above the ground, conventionally, it was necessary to operate an operating tool that was provided to manually operate the drive mechanism for raising and lowering the wheels. This caused the following inconveniences.

[Problem that the invention seeks to solve]

That is, when turning the aircraft, in addition to operating the clutch to stop driving the working parts and supporting the aircraft in the tilted position, it is also necessary to operate the operating tool to lower the wheels. However, work efficiency was decreasing from an operational standpoint.

An object of the present invention is to enable simultaneous operation of supporting the aircraft body in an inclined position and lowering the wheels.

[Means for solving problems]

The present invention is characterized in that the above-mentioned mobile paddy field work vehicle is provided with a sensor that detects the height above the ground of a portion of the self-propelled vehicle located in front of the wheel core, and the sensor is used to detect the height above the ground. There is provided a mechanism linked to the drive mechanism so that the drive mechanism is automatically operated to the wheel lowering side when the height reaches a set value, and its functions and effects are as follows.

[Effect]

The above-mentioned setting position is set at a height above the ground where it is located when the aircraft turns and where mud stains are not likely to occur. Then, if the body is operated forward and downward so that the sensor detects the set height, the drive mechanism is operated by the linkage mechanism and the wheels are lowered.

〔Effect of the invention〕

The operation to lower the wheels can be performed while the aircraft is in a tilted position for turning, and it is possible to quickly make a small turn while raising the aircraft above the ground to avoid getting muddy. , I was able to work more efficiently.

〔Example〕

As shown in FIGS. 4 and 5, two seedling planting arms 4 are arranged in parallel in the lateral direction of the aircraft at the rear of the self-propelled aircraft, which has one running wheel 1, an engine 2, a control handle 3, etc. , 4, and these planting arms 4 are equipped with a seedling planting 6 having a seedling stand 5 for supplying seedlings, and a pair of left and right ground floats 7a,
A traveling rice transplanter is constructed by attaching the rice transplanters 7b in a manner that they are distributed to the left lateral outer side and the right lateral outer side of the machine body relative to the wheels 1.

As shown in FIG. 6, the operation arm 8 of the traveling transmission (not shown) is attached to the transmission case 9 so as to be slidable around the axis _P1 , and the interlocking tool 10 and release wire 11a are attached. It is linked to the speed change lever 12 via the gear shift lever 12, and to the operating lever 15 of the planting clutch 14 via the interlocking tool 13 and the release wire 11b. Then, the operating arm 8 is urged to the first forward speed position _F1 by the spring 16, and both the interlocking tools 1
0 and 13, respectively, are elongated holes 10a or 1 that enable relative movement of the operating arm 8 and the operating arm 8 within a set range.
3a, and when the shift lever 12 is located at the first operating position A, the operating lever 15
so that when the lever 15 is operated to the clutch engaged position ON, the operating arm 8 moves to the first forward position _F1 , and when the operating lever 15 is operated to the clutch disengaged position OFF, the operating arm 8 moves to the second forward position _F2 , and , so that when the shift lever 12 is operated to the second operating position M, the operating arm 8 is maintained at the second forward speed position _F2 regardless of the operation of the operating lever 15.
Furthermore, when the shift lever 12 is operated to the third operating position H, the operating arm 8 is configured to move to the third forward speed position _F3 .

In other words, when the shift lever 12 is placed in the second operation position M during work, the seedling planting section 6
If the shift lever 12 is placed in the first operating position A so that the second forward speed state is displayed regardless of the drive and stop operations of the The drive stop operation of the planting section 6 can be performed all at once, and the deceleration operation after turning can be performed all at once by the drive operation of the planting section 6. When driving on the road, the second forward speed state is obtained by operating the shift lever 12 to the second operating position M, and the state is obtained by operating the shift lever 12 to the third operating position H. 3
It is designed so that a fast state can be obtained.

The transmission case 17 for the wheel 1 is connected to the transmission case 9 so as to swing up and down around an axis _P2 , and is configured to be swing operated by a hydraulic cylinder 18 via a link mechanism 19,
The cylinder 18, which is an example of a drive mechanism, allows the wheel 1 to be moved up and down relative to the aircraft.

As shown in FIG. 1, a pair of the floats 7
The front end side of each of a and 7b is connected to the interlocking tool 20a or 20b.
A pair of floats 7a and 7b are connected to the fuselage frame 21a or 21b so as to be able to rise and fall freely.
The respective rear end side supports 22a or 22b are pivotally connected to the attachments 23a or 23b of the self-propelled aircraft, and the pair of ground floats 7a, 7b are individually aligned with the axis P on the rear end side with respect to the self-propelled aircraft. It is configured to swing up and down around ₃ .

As shown in FIG. 2, a spring 26 is attached to the swing operation arm 25 of the control valve 24 of the cylinder 18 so as to urge the wheel to the raised position U, and as shown in FIG. A rotating shaft 2 is connected to the arm 25 in the lateral direction of the machine via a first push/pull rod 27 and a swing linking device 28.
9 is rotatably installed on a pair of supports 30a, 30b of the self-propelled aircraft, and an extending end of a rotary shaft operating arm 31 extending in the longitudinal direction of the fuselage and extending integrally from the rotary shaft 29 so as to be integrally rotatable. A pair of left and right free ends of a balance arm 32, which is pivotally connected to the balance arm 32 so as to be relatively rotatable, are respectively linked to the front end side of the pair of ground floats 7a and 7b via a pair of second push/pull rods 33a and 33b. The cylinder 18 and the pair of ground floats 7a and 7b are connected to each other to form a linkage mechanism 35, and by moving the floats 7a and 7b to the same side beyond a set range, the cylinder 18 is connected to the wheels. The grounding float 7a is operated in the up/down state,
The cylinder 18 is configured to be automatically operated so that the mounting height of the cylinder 7b is within the set range,
A pair of grounding floats 7a, 7 due to uneven mud surface
The work can be carried out while preventing the wheel 1 from being controlled to rise and fall due to the movement of the wheel 1 in the opposite direction of b, and while maintaining the seedling planting depth almost constant regardless of the unevenness of the tiller.

That is, if the installation height of both the pair of ground floats 7a and 7b is within the set range, the weight of the pair of ground floats 7a and 7b and the spring 2
The operating arm 25 due to the descending force caused by 6 and the grounding
is maintained at the neutral position N. Then, when the mounting height of either of the pair of ground floats 7a, 7b rises beyond the set range,
This rising force causes the rotating shaft operating arm 31 to swing to the rising side, and the operating arm 25 is operated to the wheel lowering position D, and the pair of ground floats 7a, 7
The fuselage is raised above the ground until the mounting height of each b is returned to within the set range. When the mounting height of both of the pair of ground floats 7a and 7b falls beyond the set range, the rotating shaft operating arm 31 is swung in the downward direction by this descending force, and the operating arm 25 is spring-loaded. 26, the wheels are operated to the raised position U, and the aircraft is lowered from the ground until the mounting height of each of the pair of ground floats 7a, 7b returns to within the set range. Even if the pair of ground floats 7a and 7b move up and down in opposite directions, the balance arm 32 only swings up and down around the axis of the rotating shaft operating arm 31, and the rotating shaft operating arm 31 does not swing. , operation arm 2
The operation in step 5 is not performed.

As shown in FIGS. 4 and 5, a ground sensor 36 is attached to the front end portion of the self-propelled aircraft located in front of the wheel center so that it can swing up and down around the axis _P4 on the front end side. It is installed so as to detect the height of the front end portion above the ground based on the body swing angle. As shown in FIG. 1, a spring 37 is attached to the sensor 36 so as to bias it downward, and a swinging member 39 interlocked with the sensor 36 via a push-pull release wire 38 is attached to the operating arm. It is attached to the control valve 24 concentrically with the control valve 25 and swingable relative to the control valve 25, and is swingable in a long hole 39a formed to prevent it from being operated together with the operating arm 25 by the ground floats 7a and 7b. The operating arm 25 is operated through the end of the first push-pull rod 27 inserted into the ground, and the self-propelled aircraft is operated in a forward downward position compared to when working, thereby allowing the self-propelled aircraft to move forward and downward. When the sensor 36 detects that the front end of the aircraft has reached the height above the ground that is set to be at the position at which the aircraft turns and is less likely to get muddy, the operating arm 25 moves upward. The sensor 36 and the cylinder 18 are linked together so that the cylinder 18 that is operated to the wheel lowering position D is driven.

Note that the elongated hole 28a of the swinging interlocking tool 28 shown in FIG.
is for relatively moving the first push/pull rod 27 and the swing interlocking device 28 so that the ground floats 7a, 7b are not lowered when the sensor 36 operates to lower the wheels. An operating lever 40 interlocked with the rocking interlocking tool 28 is used to manually operate the control valve 24 to lower the wheel.

[Another example]

In order to link the cylinder and each of the pair of ground floats so that the wheel 1 is automatically controlled to raise and lower, in addition to the above-mentioned mechanical configuration, a pair of sensors and a control valve are installed to separately detect the installation height of each of the ground floats. An electrical configuration may be adopted that includes a control circuit that operates a solenoid that operates the solenoid based on information from each of the sensors.

A non-contact sensor may be used instead of the ground sensor 36, and these may be simply replaced by the sensor 36.
The release wire 38 and the swinging member 39
are referred to as link mechanisms 38 and 39.

The present invention can also be applied to work vehicles for various paddy field operations such as fertilization and sowing in addition to planting seedlings.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking-type paddy field work vehicle according to the present invention, in which Fig. 1 is a perspective view of the linkage mechanism, Fig. 2 is a side view of the control valve operating section, and Fig. 3 is a side view of the control valve operating section. 4 is a side view of the entire walking rice transplanter, FIG. 5 is a partially cutaway plan view of the entire walking rice transplanter, and FIG. 6 is a speed change operation system diagram. DESCRIPTION OF SYMBOLS 1... Traveling wheel, 7a, 7b... Ground float, 18... Drive mechanism, 35... Coordination mechanism, 36
...sensor, 38, 39...coordination mechanism.

Claims (1)

[Claims] 1. On a self-propelled aircraft body having one running wheel 1, a pair of left and right ground floats 7a, 7b are distributed from the wheel 1 to the left lateral outside and right lateral outside of the aircraft body, so that each can be raised and lowered separately. At the same time, a linking mechanism 35 is linked to each of the pair of floats 7a and 7b so that the wheel lifting drive mechanism 18 is automatically operated so that the mounting height of the floats 7a and 7b is within a set range. a pair of said floats 7;
A and 7b are both provided in a state in which the drive mechanism 18 is operated in a wheel raising/lowering state by raising and lowering the same above the set range, and the self-propelled body is A sensor 36 is provided to detect the height above the ground of a portion located forward of the wheel core, and the drive mechanism 18 is automatically operated to lower the wheel when the height detected by the sensor 36 reaches a set value. The drive mechanism 18
A walking paddy field work vehicle equipped with mechanisms 38 and 39 linked to the .