JPH0233633Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a traveling device in a walk-behind rice transplanter.

[Conventional technology]

Traditionally, walk-behind rice transplanters use a float that slides across the field to plant seedlings using a seedling planting mechanism attached to the machine, as shown in the prior art, for example, in Japanese Utility Model Application Publication No. 55-118923. It was common practice to level the ground in advance of the area where the seedlings were planted.

Additionally, during rice planting work, the height of the walking rice transplanter's body relative to the field can be automatically controlled so that the seedling planting depth remains approximately constant by moving the wheels that support the rice transplanter up and down. It is being said.

In this case, as the prior art for detecting the height of the machine body is disclosed in the previous publication, a front and rear longitudinal float that slides on the field is installed on the bottom surface of the machine body between the left and right wheels so as to be able to move up and down. The lower end of a sensor protruding downward from the lower surface of the fuselage was brought into contact with the upper surface of the float, and the difference in height between the upper surface of the float and the lower surface of the fuselage was sensed by the sensor.

On the other hand, in order to set a seedling planting row next to the seedling planting row spacing that has already been planted in the field, mark the field with side markers provided on both left and right sides of the front of the machine. I was trying to maneuver the aircraft so that the wheels would follow the lines.

[Problems that this invention attempts to solve]

However, if the traveling wheels are in contact with the plowing platform below the field surface, and the floats in contact with the field surface are placed between the left and right floats, then either the left or right wheel will pass over the uneven plowing surface. However, there is a problem in that the sensor does not detect height differences unless the float moves up and down relative to the field surface, and
As mentioned above, additional side markers were required to improve the straight line maneuverability of the aircraft.

In this invention, both left and right floats are placed behind the left and right wheels when the aircraft moves forward, and a pair of left and right sensors are placed so that they touch the ground in front of the left and right wheels. ,
Avoid associating the sensor with floats,
This is an attempt to solve the above problems.

[Means for solving problems]

Therefore, in the present invention, a seedling planting mechanism is attached to a machine body equipped with an engine, and the wheels are mounted on both left and right sides of the machine body so as to be movable up and down. At the rear, a pair of left and right floats are placed appropriately separated from each other, while
A pair of left and right sensors are installed in front of the left and right wheels to detect the height difference between the machine body and the field and to move the wheels up and down. They are placed so that they are grounded to the field at intervals.

[Effect]

By arranging the float at a position behind each wheel in this manner, the ruts caused by each wheel can be eliminated by the float.

On the other hand, by arranging the sensors in front of the wheels, each sensor can immediately detect the difference in height of the machine relative to the field due to the wheels running on the tiller, improving responsiveness to the lifting and lowering action of the wheels. Can be done. Moreover, by moving forward with both the left and right sensors placed in front of the wheels and in contact with the field, the wheels can be moved forward when the wheels are passed to positions adjacent to and appropriately spaced from the already planted seedling rows. Each sensor plays the role of a so-called side marker, marking the passing position in advance.

〔Example〕

The present invention will be explained below with reference to the drawings of the embodiments. In the drawings, reference numeral 1 denotes a fuselage 6 to which an engine 3 is connected to the front part of a transmission case 2, and a transmission case 5 is connected to the rear part via a frame 4. A walking type rice transplanter is shown, which consists of a pair of left and right wheels 7, 7 on both the left and right sides of the transmission case 5, and a vertically swinging type seedling planting mechanism 8 is attached to the transmission case 5, and a , a seedling stand 10 and a pair of left and right control handles 11, 11 are attached. The two control handles 11, 11 are formed in a dogleg shape when viewed from the side, and floats 12, 12 are attached to the lower ends of both of them via seedling planting depth adjustment rods 9, 9, respectively, and the floats 12, 12 are connected to the left and right wheels 7,
It is located behind 7.

The two wheels 7, 7 are connected to the transmission case 2.
Swing arms 13, 1 are pivotally connected to the left and right sides of the base end so as to be movable up and down, and extend rearward.
It is attached to the tip of the engine 3 and is rotationally driven by the power from the engine 3.

Reference numeral 14 indicates a hydraulic cylinder for vertically moving both swing arms 13, and the hydraulic cylinder 1
4 is located at a lower portion of the engine 3, and its rear end is attached to the front surface of the transmission case 2 via a rubber shock absorber 15. In addition, the piston rod 16 of the hydraulic cylinder 14 is connected to the rice transplanter 1.
The piston rod 16 of the hydraulic cylinder 14 is arranged so as to protrude forward.
The swinging rod 17 is pivoted at its center by a pin 18 so as to be freely rotatable in the horizontal direction, and both the left and right ends of the swinging rod 17 are connected to the swing arms 13 and 13 via connecting rods 19, respectively.
13 respectively, and by the forward protruding movement of the piston rod 16, both swing arms 13, 13
is configured so that it rotates downward and both wheels 7, 7 are lowered simultaneously, and it is also configured such that both wheels 7, 7 move up and down in opposite directions due to the rotation of the swinging rod 17.

The swinging rod 17 has a mechanism (not shown) that stops the reverse operation of both wheels due to the rotation of the swinging rod 17, or stops the reverse operation when there is a height difference between the two wheels. is provided.

The base end shaft portions 21 of the left and right sensors 20, 20 are rotatably attached to the lower support frame of the engine 3, and the lower ends 20a, 20b of both sensors 20, 20 are shaped like floats or sleds. The lower end portions 20a and 20b of both sensors are arranged so as to slide on the field scene 22 at a position in front of the point where the left and right wheels 7, 7 move forward on the field scene 22, respectively. And both the sensors 20,
20 and the switching valve 23 of the hydraulic cylinder 14 are connected by a link mechanism or a wire 24, etc., and the sensors 20, 20 detect the height difference between the machine body 6 and the field area 22, and It is configured so that if it goes low, it lowers the aircraft, and if it goes low, it raises the aircraft. Reference numeral 25 denotes a protective cover body that covers the lower surface of the hydraulic cylinder 14.

With this configuration, when the piston rod 16 in the hydraulic cylinder 14 is moved significantly forward when the rice transplanter 1 turns or runs on the road, both swing arms 13 that are interlocked with the piston rod 16 via the swing rod 17 and the connecting rod 19 move downward. Since the wheels 7, 7 attached to the tips of both swing arms 13 rotate,
Descend relative to the aircraft 6.

In addition, during rice planting work, the hydraulic cylinder 14
The piston rod 16 is moved back and forth, and the floats 12 at the rear of the fuselage 6 are
If the wheels 7, 7 are driven while the machine is in contact with the ground, the machine will go straight, and by driving the seedling planting mechanism 8,
Seedlings can be planted one by one from the seedling pine on the seedling stand 10 using the seedling claws, and the seedlings can be planted along a plurality of rows (two rows in this embodiment) at appropriate intervals in the field area 22. At this time, as the depth between the tiller 26 on which the wheels 7, 7 touch the ground and the field surface 22 above it decreases, the difference in height between the lower surface of the machine body 6 and the field surface 22 increases, and this is immediately detected by the sensor 20, 20, the wheels 7, 7 are raised via the hydraulic cylinder 14 and the swing arms 13, 13, and the seedling planting mechanism 8 at the rear of the machine body can plant the seedlings at a constant depth in the field area 22. On the other hand, when the depth between the tiller and the field surface 22 above it increases, the wheels 7, 7
The machine body sinks until it touches the ground, and the difference in height between the bottom surface of the machine body 6 and the field scene 22 becomes smaller, so by immediately detecting this with the sensors 20, 20, the hydraulic cylinders 14 and swing arms 13, 13 are activated. The wheels 7, 7 can be lowered through the vehicle, and both wheels 7, 7 can be brought into contact with the tiller 26, thereby stabilizing the running.

Regarding the detection of the height difference between the aircraft body and the field scene by the left and right sensors 20, 20, and the connection to the hydraulic cylinder switching valve 23, one or both of the left and right sensors detect the height difference of a predetermined value. You can switch by detecting the difference, or you can install both the left and right sensors with a balance mechanism, and switch when the average value of the height difference from both the left and right sensors reaches a predetermined value. It's okay.

The lower end portions 20a of both the left and right sensors,
When moving forward with the left and right sensors 20b in contact with the field 22, the marks they leave on the field become a mark for passing the front position where the wheels 7, 7 pass, and the lower ends 20a, 2b of both the left and right sensors are, so to speak, It will serve as a side marker. Moreover, the lower end portions 20a and 20b are connected to the rear control handle 1 of the fuselage.
1, 11 can be observed well by workers,
The aircraft can easily fly straight ahead.

Further, since the left and right floats 12, 12 are appropriately spaced apart from each other in the left and right direction, when the body tilts left and right, so-called rolling, the right and left sides of the rear side of the body can be appropriately supported, and maneuverability can be improved. Furthermore, if these left and right floats are placed at a distance equal to the left and right distance between the left and right wheels, the ruts caused by the left and right wheels can be erased by the left and right floats immediately behind, and the three components of the sensor, wheels, and floats can be removed. If arranged in a straight line, the float can erase the marks of the sensor and wheels all at once.

Furthermore, both lower ends 2a, 20 of both left and right sensors
If b is formed into a float or sled shape,
Even when the aircraft backs up, the wheel marks are kept at both lower ends 20.
It can be erased with a and 20b.

[Effect of idea]

In this way, according to the present invention, the sensor that detects the height difference between the machine body and the field scene is arranged at a position in front of the field scene where both the left and right wheels are traveling, so that the wheel passage area and the detection position match. Therefore, the sensor can immediately detect the difference in height between the wheels and the tiller, as well as the difference in height between the machine and the field, improving responsiveness to the lifting and lowering of the wheels and improving the ability to automatically adjust the seedling depth. In addition, the left and right sensors can use the traces of contact with the field as a mark for the wheels to move straight, eliminating the need for separate side markers, simplifying the structure of the rice transplanter, and improving the machine body. This has the effect of significantly improving maneuverability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of a rice transplanter, FIG. 2 is a side view, and FIG. 3 is a schematic diagram of a wheel lifting mechanism. 1...Rice transplanter, 2...Mission case, 3...
... Engine, 4 ... Frame, 5 ... Transmission case, 6 ... Airframe, 7 ... Wheels, 8 ... Seedling mechanism,
10...Seedling stand, 11...Control handle, 13...
...Swing arm, 12...Float, 14...
Hydraulic cylinder, 16... Piston, 17... Swinging rod, 25... Protective cover body, 20, 20... Sensor, 20a, 20b... Lower end, 23... Switching valve.

Claims (1)

[Scope of utility model registration request] A seedling planting mechanism is attached to the aircraft equipped with an engine,
Wheels mounted on both the left and right sides of the aircraft body are configured to move up and down via hydraulic cylinders, and behind both wheels, a pair of left and right floats are disposed at an appropriate distance from each other, while A pair of left and right sensors are installed in front of the left and right wheels to detect the height difference between the machine body and the field and to move the wheels up and down. A traveling device for a rice transplanter that is arranged so as to be in contact with the field at intervals.