JPH039Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention is a rice transplanter that has left and right rice surface sensing floats attached to the underside of the machine. The present invention relates to a device for controlling elevation.

"Prior Art" Conventionally, as shown in Fig. 5, a pair of rice-transplanting floats A and B for sensing the rice-transplanting machine were placed at appropriate intervals in the left-right direction at the bottom of the rice-transplanting machine, and the left and right sides of the rice-transplanting machine were raised and lowered. left and right hydraulic cylinders C and D,
Equipped with left and right hydraulic valves E and F that control the operation of each cylinder C and D, the rice transplanting machine is raised and lowered based on the vertical movement of the floats A and B, and the planting depth of the seedlings by the planting claws is kept approximately constant. A technology has been developed to keep the

"Problems to be solved by the invention" In the prior art, the left and right floats A and B were directly interlocked and connected to the left and right hydraulic valves.
Horizontal control of the rolling (left and right tilting) movement of the aircraft is achieved by setting a large neutral range for switching operation of the hydraulic valves E and F, which are necessary to hold the hydraulic cylinders C and D stopped and support the aircraft in a fixed manner. The sensitivity becomes dull, making it impossible to obtain proper horizontal control, and in order to improve the horizontal control sensitivity to rolling operation,
Setting the neutral range of switching operation to a small value not only makes it difficult to securely support the aircraft, but also
The control sensitivity of the pitching (tilting in the longitudinal direction) operation of the aircraft body also becomes sensitive, and the elevation control of the aircraft body becomes sensitive to the pitching operation, and the hydraulic cylinders C,
There were problems such as D's hunting operation.

``Means for Solving the Problem'' However, the present invention is designed so that the neutral range of hydraulic valve switching operation when either the left or right float moves up or down is smaller than the neutral range of hydraulic valve switching operation when the left and right floats move up and down at the same time. It is composed of

"Function" Therefore, the hydraulic valve can be sensitively switched and operated in response to the rolling motion of the aircraft body in which either the left or right float moves up and down, and the hydraulic valve can be operated sensitively in response to the pitching motion of the aircraft body in which the left and right floats move up and down at the same time. A sufficient neutral range of switching operation can be secured, and stable planting travel can be obtained with simpler handling operations than in the past.

"Embodiments" Examples of the present invention will be described below in detail based on the drawings. Figure 1 is an explanatory diagram of the descending control, Figure 2 is a side view of the walking rice transplanter, and Figure 3 is a plan view of the same.
2 is an engine, 2 is a transmission case, 3 is a planting case connected to the transmission case 4 via a transmission case 4, and 5 is a rice transplanting machine constituted by the engine 1 and each of the cases 2, 3, and 4. A bonnet covering the upper side; 6 is a preliminary seedling stand provided on the rear of the bonnet 5; 7 is a steering handle connected to the planting case 3; 11 is a transverse feed shaft that is attached to the planting case 3 and drives the seedling platform 8 laterally; 12 is a transverse feed shaft that is attached to the planting case 3 to drive the seedling platform 8; Attached arm 13
14 is a pair of left and right paddy running wheels that are supported on the transmission case 2 via a swing case 15 so as to be able to rise and fall; 16 and 17 are a pair of left and right hydraulic cylinders that independently control the entrance and exit of the left and right running wheels 14 and 14 via the swing cases 15 and 15; 20 is a front float that can be raised and lowered freely, and 21 and 22 are a pair of left and right rear floats that are rice field sensing floats that are installed between the left and right running wheels 14 and 14 below the planting case 3 and handle 7, etc. The rear side of left and right rear floats 21, 22 is supported via a link 24 connected with a planting depth adjustment lever 23, and the front side of each float 21, 22 is configured to be movable up and down.

Furthermore, as shown in FIGS. 1 and 4, a machine frame 29 is provided with hydraulic valves 27 and 28 for connecting and controlling the left and right hydraulic cylinders 16 and 17 to hydraulic pumps 25 and 26, and is fixed to the rice transplanting machine body such as the transmission case 4. Attachment valves 27 and 28 to the
A horizontal frame 30 is provided on the front upper side of the rear floats 21 and 22 to be horizontally suspended in the left and right direction of the rice transplanting machine,
The spools 27a and 28a of the valves 27 and 28 are connected to both ends of the horizontal frame 30 through left and right fulcrum pins 31 and 32, respectively.

Sensor arms 35 and 3 are connected to the intermediate portion of the horizontal frame 30 via sensor pins 33 and 34.
while connecting one end of the sensor arm 3
Connect the other ends of 5 and 36 to the left and right rear floats 21 and 22.
When either the left or right rear float 21, 22 moves up or down due to rolling (tilting of the machine in the horizontal direction) of the rice transplanter, the horizontal frame is connected to the front upper surface of the rice transplanter, centered around the left or right fulcrum pins 31, 32. 30 swings up and down, and the floats 21, 22
The amount of displacement of the spools 27a, 28a is greater than the amount of displacement of the sensor arms 35, 36 due to the lifting and lowering of the floats 21, 36 on the left and right by the lever movement of the horizontal frame 30 centered on the fulcrum pins 31, The neutral range of the switching operation of the hydraulic valves 27 and 28 when the floats 22 move up and down at the same time is smaller than the neutral range of the switching operation when either the left or right floats 21 and 22 move up and down.

Further, a pitching arm 39 is connected to the center of the horizontal frame 30 through a pin 37 and a long hole 38, and the pitching arm 39 is connected to a body lifting lever 40 provided on the steering handle 7 through a wire 41. By operating the lever 40, a single wire 41 is used to connect the left and right hydraulic valves 27, 2.
8 in the same direction at the same time, the left and right running wheels 1
4 and 14 are moved in and out at the same time to raise and lower the rice transplanter.

The present invention is constructed as described above, and when the rice transplanting machine tilts left and right and performs rolling operation due to the left and right reciprocating movement of the seedling platform 8 or the unevenness of the tiller, the float 21 or 22 on the descending side of the incline is grounded. When the reaction force becomes large, the front part of the float 21 or 22 on that side is raised, the hydraulic valve 27 or 28 is switched to operate the hydraulic cylinder 16 or 17, and the rice transplanting machine on the downward slope side is lifted and supported approximately horizontally. . At this time, each float 21, 22 is supported substantially horizontally.

For example, when the rice transplanting machine tilts to the right, the front part of the right float 22 rises, swings the horizontal frame 30 upward about the left fulcrum pin 31 as shown in the imaginary line in FIG. 28, the hydraulic cylinder 17 is operated to retract, the right running wheel 14 is projected, the right side of the rice transplanter is lifted up, and the rice transplanter is supported approximately horizontally. The amount of displacement of the spool 28a of the hydraulic valve 28 is increased by the lever movement of the horizontal frame 30, and the sensor arms 35, 36 and the horizontal frame 30 are increased by the pitching operation of the rice transplanting machine in which the left and right floats 21, 22 go up and down simultaneously. Spool 2 moves forward and backward through
Compared to the displacement of 7a and 28a, the horizontal frame 30
The amount of displacement of the spool 28a due to the lever movement is increased. Therefore, compared to the neutral range of switching operation of the hydraulic valves 27 and 28 during pitching operation of the rice transplanter, the neutral range of switching operation of the valves 27 or 28 during rolling operation of the rice transplanter is narrower, and compared to the longitudinal tilt of the rice transplanter The hydraulic cylinders 16 and 17 are sensitively operated during this left and right tilting, and the rice transplanter is sensitively returned to the horizontal position in response to the rolling motion of the rice transplanter, while the hydraulic cylinders 16 and 17 are used to raise and lower the machine in response to the pitching motion of the rice transplanter. To prevent hunting and stably support the aircraft.

In addition, when changing the direction of the rice transplanting machine at the edge of a ridge, the left and right hydraulic valves 2
7 and 28 are switched to the raising or lowering state almost simultaneously, and the entire rice transplanting machine is raised and lowered.

In addition, during rice transplanting work, when the left and right floats 21 and 22 rise or fall almost simultaneously due to the pitching operation of the rice transplanting machine, the horizontal frame 3
0, the left and right hydraulic valves 27, 28 are switched to the ascending and descending states almost simultaneously to support the rice transplanting machine at a constant height.

"Effects of the Invention" As is clear from the above embodiments, the present invention has floats for detecting rice fields such as left and right rear floats 21, 22 installed on the fuselage side, and each of the floats 21, 2
In a rice transplanter that controls the rice transplanter's elevation by switching hydraulic valves 27 and 28 according to the vertical movement of 2, when the left and right floats 21 and 22 move up and down at the same time, the switching operation of the hydraulic valves 27 and 28 is either left or right than the neutral range. It is configured so that the neutral range when one of the floats 21 or 22 moves up and down is small, and the hydraulic valves 27 and 28 are sensitive to the rolling motion of the aircraft when either the left or right float 21 or 22 moves up and down. The left and right floats 21, 22 can be switched to
It is possible to secure a sufficient neutral range for the switching operation of the hydraulic valves 27 and 28 during rolling operation with respect to pitching operation of the machine body which moves up and down at the same time, and to obtain stable planting operation with simpler handling operations than before. This allows the aircraft to quickly return to horizontal position in case of rolling motion.
With regard to pitting operations, hunting can be prevented, the machine body can be easily fixed and supported, and continuous rice planting work can be performed more safely than before.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of elevation control showing an embodiment of the present invention, Fig. 2 is a side view of the walking rice transplanter, Fig. 3 is a plan view of the same, Fig. 4 is a plan view of the main parts, Fig. 5 The figure is an explanatory diagram of elevation control showing a conventional technique. 21, 22... Rear float (field surface sensing float), 27, 28... Hydraulic valve.

Claims (1)

[Scope of utility model registration request] In a rice transplanter in which left and right rice surface sensing floats are attached to the bottom of the machine, and the vertical movement of each of the floats switches hydraulic valves to control the rice transplanter's elevation, the hydraulic valve switching operation is neutral when the left and right floats move up and down at the same time. A planting control device for a rice transplanter, characterized in that the neutral range when either the left or right float moves up or down is smaller than the range.