JPH0310808Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is equipped with a rice field sensor that is grounded on the rice field and detects height changes between the rice field and the aircraft body, and controls the aircraft's elevation based on the detection operation of the sensor. The present invention relates to a rice field detection device for a rice transplanter that maintains a constant planting depth.

``Prior Art'' Conventionally, in a structure equipped with such a rice field sensor, the pivot point of the sensor is provided in front or behind the sensor connection part, as shown in Fig. Even if the vertical position changes,
Hydraulic valves for lifting and lowering were operating.

``Problems that the invention attempts to solve'' However, this structure had the following drawbacks.

(1) Since the machine body can freely move up and down within the dead zone range θ of the sensor, the raising or lowering ranges α and β will not be reached unless the machine (planting part) is tilted more than a certain level, and therefore the dead zone range θ There is a large variation in planting depth within the area.

(2) Since the only acting force to move the sensor up and down is the buoyancy of the sensor itself, in order to obtain the necessary force it is necessary to make the contact surface of the sensor considerably large, resulting in a reduction in water flow. There were problems such as the fact that the moving speed of the planting operation could not be easily increased because of the obstruction to the plant.

Therefore, as shown in Utility Model Application Publication No. 56-55313,
There was a technology in which the rice field sensor moved back and forth due to the resistance of the rice field to detect the height above the ground, but in the structure of the riding rice transplanter, the rice field sensor was placed near the seedling planting member of the float on one side of the float. When using a large float such as a walk-behind rice transplanter, the rice field sensor tends to malfunction due to drainage water, and the rice field sensor cannot be easily installed because the wheels are placed near the seedling planting part of the float. There were other problems.

``Means for solving the problem'' However, the present invention provides left and right wheels on both sides of the float via swing cases, a field sensor that detects changes in the height of the aircraft from the ground, and a left and right wheel based on the sensor output. In a rice field detection device for a walk-behind rice transplanter that is equipped with a hydraulic cylinder that raises and lowers the machine body by swinging a swing case, the rotation fulcrum axis of the rice field sensor provided at the bottom of the machine body is positioned approximately directly above the ground plane of the rice field sensor. A pair of field sensors are arranged symmetrically on both sides of the front part of the float, the left and right field sensors are connected to both ends of the rotation fulcrum shaft, and the rotation fulcrum is connected to the hydraulic switching valve of the hydraulic cylinder. This device is characterized in that the left and right side surface sensors are connected via the intermediate portion of the shaft.

``Function'' Therefore, since the rotation fulcrum axis is provided almost directly above the ground surface of the rice field sensor, the rice field sensor moves back and forth due to the resistance of the rice field and can control the hydraulic cylinder, and the small rice field sensor can eliminate the dead zone. The detection performance can be easily improved by reducing the range, and since the rice field sensors are installed on both sides of the front of the float via the rotational fulcrum shaft, changes in the height of the aircraft from the ground can be accurately detected, and the left and right rice field sensors can be easily detected. The ability to control the planting depth can be easily improved by operating hydraulic cylinders from one or both of them, and the rice field sensor can be supported simply and in a well-balanced manner on both sides via the rotation fulcrum shaft, making it possible to easily support the rice field sensor on both sides of the rice field through the rotation fulcrum shaft. The sensor mounting structure can be simplified and the detection and control functions can be improved easily.

"Embodiment" An embodiment of the present invention will be described below in detail based on the drawings.

Fig. 1 is a partially enlarged explanatory view showing the main parts, Fig. 2 is an overall side view of the rice transplanter, and Fig. 3 is a plan view thereof.
In the figure, 1 is an engine, 2 is a transmission case, 3 is a planting transmission case, 4 is a planting drive case, 5 is a paddy wheel supported on both sides of the transmission case 2 via a swing case 6, and 7 is the engine 1 and a float that supports the aircraft body consisting of each case 2, 3, and 4 via a support link 8 and a buffer member 9; 10 is a steering handle connected to the rear end of the drive case 4;
Reference numeral 11 denotes a two-row seedling stand 14 which is installed along the drive case 4 and the upper part of the handle 10 via guide members 12 and 13 and is movable back and forth from side to side.
16 is a planting claw that is attached to the drive case 4 via the crank arm 15 and takes out one seedling from the seedling stand 11 and plants it; 16 is a sensor arm 18 that is attached to the engine base frame 17 on which the engine 1 is mounted; The Tabe sensor consists of a pair of left and right spherical floats that are supported so as to be able to swing back and forth through the float 7. Reference numerals 19 and 19 are side floats that are arranged in the same manner on both the left and right sides of the rear end of the float 7, and move back and forth when the aircraft is running. Plant one seedling at a time from the seedling stand 11.
4, they are taken out and planted in the field one after another.

As shown in FIGS. 1 and 4, a hydraulic switching valve 20 is fixedly installed on one side of the mission case 2, and a hydraulic cylinder 21 whose operation is controlled by the switching valve 20 is installed on the upper side of the mission case 2. Fixedly installed in
The middle of a swing plate 24 is pivotally supported at the tip of the piston rod 22 of the cylinder 21 via a rubber member 23. In addition, swing arms 25, 25 are integrally connected to the left and right swing cases 6, 6.
The left and right ends of the swing plate 24 are connected through swing rods 26, 26, and the expansion and contraction of the piston rod 22 is configured to control the vertical movement of the wheels 5, 5, that is, the elevation of the machine relative to the field.

On the other hand, the sensor 16 has a sensor arm shaft 27, which is a rotational fulcrum shaft, rotatably supported on the base frame 17 via a bearing 28, and the arm shaft 27 is positioned approximately directly above the ground plane of the sensor 16.
7 is disposed, and the sensor 16 is configured to swing back and forth about the arm shaft 27 when a change in height occurs between the plane and the aircraft body while traveling. The tip of the swinging arm 29 fixed at the middle of the arm shaft 27 and the switching arm 3 of the switching valve 20
0 through a switching rod 31, and when the sensor 16 swings back and forth, the switching valve 20 is operated via the switching arm 30 to cause the piston rod 22 of the cylinder 21 to extend and contract. are doing.

The present embodiment is constructed as described above, and when the height of the planting field surface relative to the machine body changes due to changes in the unevenness of the tiller during rice planting work, the ground pressure of the sensor 16 changes in proportion to the height of the rice field. The sensor 16 is oscillated back and forth around the arm shaft 27, and as a result, the switching arm 30
The switching valve 20 is operated via the hydraulic cylinder 21.
is controlled, the wheels 5 are adjusted to vertical height positions via the swing case 6, and the planting depth of the seedlings by the planting claws 14 is maintained constant.

FIGS. 5 and 6 show other examples of modified structures of the sensor 16. In the one shown in FIG.
In the case of the one shown in FIG. 6, the field sensor 16a made of the above-mentioned ship-shaped float is supported on the arm shaft 27 through a pair of parallel links 33 and 34, so that it can swing back and forth. The arm shaft 27 is integrally connected to one of the parallel links 34, and the wheel 5 is moved up and down by swinging the field sensor 16a in the front and back direction, as in the previous embodiment. It is configured to be adjusted.

FIG. 7 to FIG. 10 show still other examples of modified structures, in which the hydraulic cylinder 2
The switching valve 20a, which controls the operation of the switching valve 20a, is operated by raising and lowering solenoids 35 and 36, and the mounting plate 39 has the raising and lowering switches 37 and 38, which excite and operate these solenoids 35 and 36, installed oppositely at the lower part of the fuselage. , 40, and is supported on a rotational fulcrum shaft 41 at the bottom of the body between these mounting plates 39, 40 so as to be swingable back and forth.
Switch operation pieces 42 and 43 for turning on the switches 37 and 38 are installed at b, and the sensor 1
6b is oscillated in the front-rear direction, and the operating pieces 42, 43
When the switch 37 or 38 is turned on via the solenoid 35 or 36, the solenoid 35 or 36 is energized, the switching valve 20a is switched, and the piston rod 22 of the cylinder 21 is moved to expand and contract as in the previous embodiment. Note that FIG. 8 shows the sensor 16b.
A comb-shaped ground plane portion 14 is formed at the bottom of the flat plate. FIG. 9 is a hydraulic circuit diagram in which a hydraulic pump 45 is connected to the hydraulic cylinder 21 via a switching valve 20a. Furthermore, the first
Figure 0 is an electrical circuit diagram with power supply 46 and main switch 4.
The solenoids 35 and 36 are connected through switches 37 and 38, respectively.

Figures 11 to 14 show still another example of a modified structure, in which a rice field sensor 16c is provided in the planting part of a riding rice transplanter; An overall side view of the machine is shown, in which reference numeral 48 denotes a traveling body, 49 an engine mounted on a base frame 50, 51 a transmission case connected to the rear end of the base frame 50, and 52.
denotes a swing case connected to both left and right sides of the rear end of the transmission case 51; 53 and 54 denote front and rear wheels for driving in paddy fields; 55 denotes a driver's seat; 56 denotes a steering handle;
57 is a three-point link mechanism 58 at the rear of the fuselage 48.
59 is a seedling stand provided in the planting section 57; 60 is a planting claw; 61
is the main float, 62 is the left and right side floats,
The sensor 1 is attached to the guard frame 63 of the pricing section 57.
6c. The sensor 16c has its upper end connected to the fixing plate 64 of the guard frame 63.
The lower end of the sensor 16c is grounded on the rice field, and a pair of lift switches 67, 6 are installed on both sides of the switch operation plate 66, which is vertically installed on the upper end of the sensor 16c.
8 is installed.

As shown in FIG. 13, the cylinder 21
The hydraulic pump 45 is connected to the spring 69 offset solenoid 70 type switching valve 20b, and the solenoid 70 is connected to the power source 46 via the main switch 47 and the switches 67 and 68 as shown in FIG. The operation of the cylinder 21 is controlled by a switch 67 during forward movement and by a switch 68 during reverse movement. That is, under normal working conditions, the switch 67 is turned on and off to control the elevation and descent of the planting section 57 even when the ground resistance of the sensor 16c changes.
8 is reliably turned on to raise the planting portion 57 and prevent damage to the planting portion 57.

FIG. 15 shows an installation state diagram of another float, and in the above embodiment, the long float 7
Although the state in which the float 7a is attached is shown, a short float 7a as shown in the figure may also be used.

"Effects of the Invention" As is clear from the above embodiments, the present invention provides left and right wheels 5, 5 on both sides of the float 7 via swing cases 6, 6, and a field sensor 16 for detecting changes in the height of the aircraft from the ground. and a hydraulic cylinder 21 that raises and lowers the machine body by swinging the left and right swing cases 6, 6 based on the output of the sensor 16. Rotation fulcrum shaft 27
is provided almost directly above the ground plane of the rice field sensor 16, and a pair of rice field sensors 16, 16 are arranged symmetrically on both sides of the front part of the float 7, and the left and right rice field sensors 16, 16 are rotated as described above. The hydraulic switching valve 2 of the hydraulic cylinder 21 is connected to both ends of the fulcrum shaft 27.
The left and right rice field sensors 16, 16 are connected to the rice field sensor 1 through the middle part of the rotation fulcrum shaft 27.
Since the rotation fulcrum shaft 27 is provided almost directly above the ground surface of the rice field 6, the rice field sensor 16 moves back and forth due to the resistance of the rice field, and the hydraulic cylinder 21 can be controlled.
The small field sensor 16 can reduce the dead zone range and easily improve detection performance, and since the field sensor 16 is attached to both sides of the front of the float 7 via the rotation fulcrum shaft 27, the height of the aircraft from the ground can be reduced. Changes can be detected accurately, and the left and right surface sensors 16,
Hydraulic cylinder 2 from either or both of 16
1, the planting depth control ability can be easily improved, and the rice field sensor 16 can be easily supported on both sides of the rotary fulcrum shaft 27 in a well-balanced manner. 16, the mounting structure can be simplified and the detection and control functions can be easily improved.

[Brief explanation of the drawing]

Figure 1 is an enlarged side view of the main part, Figure 2 is a side view of the whole, Figure 3 is the same plan view, Figure 4 is an enlarged plan view of the main part, and Figures 5 and 6 are other modifications. FIG. 7 to FIG. 8 are explanatory diagrams showing other modified structural examples, FIG. 9 is a hydraulic circuit diagram of the same, and FIG.
The figure is the same electric circuit diagram, Figures 11 and 12 are explanatory diagrams showing other modified structural examples, Figure 13 is the same hydraulic circuit diagram, Figure 14 is the electric circuit diagram, and Figure 15 is another float. FIG. 16 is an explanatory diagram of the conventional structure. 16, 16a, 16b, 16c...Tabe sensor, 27, 41, 65...Rotation fulcrum shaft.

Claims (1)

[Scope of utility model registration request] Left and right wheels 5, 5 are provided on both sides of the float 7 via swing cases 6, 6, and a field sensor 16 for detecting changes in the height of the aircraft from the ground;
In a rice field detection device for a walk-behind rice transplanter, which is provided with a hydraulic cylinder 21 that raises and lowers the machine body by swinging the left and right swing cases 6, 6 based on the 6 outputs,
A rotation fulcrum shaft 27 of the rice field sensor 16 provided at the lower part of the body is provided almost directly above the ground plane of the rice field sensor 16, and a pair of rice field sensors 16, 16 are arranged symmetrically on both sides of the front part of the float 7. The left and right rice field sensors 16, 16 are connected to both ends of the rotation fulcrum shaft 27, and the left and right rice field sensors 16, 16 are connected to the hydraulic switching valve 20 of the hydraulic cylinder 21 via the middle part of the rotation fulcrum shaft 27. A rice field detection device for a rice transplanter characterized by being connected.