JPS6361890B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a traveling device for a rice transplanter.
More specifically, it relates to a running device for a rice transplanter that links the float and running wheels via a running wheel lifting/lowering device so that the ground pressure of the float of the rice transplanter is always in a predetermined appropriate state. When the ground pressure becomes high, the running wheels are moved down to lower the ground pressure of the float, and conversely, when the ground pressure is low, the running wheels are moved up to increase the ground pressure of the float, so that the ground pressure of the float is always constant. It was controlled like that. However, simply controlling the running wheels up and down by considering only the depth from the field surface to the plowing surface, that is, the depth of the paddy field, will cause the float to sink from the field surface depending on the hardness or softness of the field surface. For example, if the field is very soft, the amount of float sinking will be large and the running resistance will be large.As a result, the running wheels will slip more and the distance between planted seedlings may become too narrow. However, there were drawbacks such as the seedlings being planted too deep due to the large amount of sinking of the float. Therefore, it has been considered to install a detection device that detects the hardness/softness of the field and use this detection result to compensate for the vertical control of the running wheels. There are many cases where the hardness and softness of the field surface changes in the lateral direction to the direction of travel, and in such cases, the vertical control of the running wheels is compensated uniformly for the hardness and softness of the pair of left and right running wheels. If this is done, there is a drawback that the running resistance changes in the left and right positions, resulting in poor straight running performance, and the seedling planting depth in the left and right sides changes greatly. Therefore, it is an object of the present invention to eliminate the above-mentioned drawbacks.

To explain one embodiment of the present invention, reference numeral 1 denotes a rice transplanting machine body, which has a traveling gearbox 2 fixed to the front part and a rice transplanting gearbox 3 fixed to the rear part.

Reference numeral 4 denotes a prime mover, and an engine stand 5 is attached to the front side of the traveling gearbox 2, and is mounted on the upper part of the engine stand 5.

Reference numeral 6 denotes a handle, the base of which is fixed to the rear of the rice transplanting gear box 3, and the tip of the handle extends upward to the rear.

Reference numeral 7 denotes a seedling tank, which is partitioned horizontally by a number of partition frames, supported so as to be movable laterally in the direction along the upper part of the handle 6, and whose upper part on the proximal end is placed inside the rice transplanting gear box 3. The left and right reciprocating mechanism is interlocked via a moving rod 8 and an interlocking frame 9.

Reference numeral 10 denotes a planting rod, which is attached via a crank to the rice transplanting gear box 3 so as to face the same number of partitioned seedling tanks 7, and is arranged to move up and down while drawing a seedling planting trajectory. The structure is such that each seedling is divided from the seedling tank 7 and planted on the surface of the field at the bottom.

Reference numerals 11 and 12 denote left and right running wheels, respectively, which are mounted at the tip portions of chain cases 13 and 14 rotatably pivoted around a boss housing a drive shaft protruding from both sides of the running gear box 2. shaft rack,
These traveling wheels 11 and 12 are provided so that they can swing up and down while being rotated by transmission.

Reference numeral 15 denotes a central float, which is disposed between the left and right running wheels 11 and 12, whose rear part is pivoted to the lower part of the rice transplanting machine 1 by a horizontal shaft 16, and whose front part is attached by a link 17 that can be expanded and contracted. There is.

Reference numerals 18 and 19 denote left and right floats, respectively, which are arranged on the outer sides of the traveling wheels 11 and 12, respectively, whose rear parts are pivotally supported by the horizontal shaft 16, and whose front parts are pivotally supported by the chain cases 13 and 14. Expansion/contraction links 22,
23 so that it can move up and down.

The scaling links of 22 and 23 are floats 18 and 1
Lower link rods 22a, 23 with one end pivoted on the 9 side
a and upper link rods 22b and 23b whose intermediate portions in the longitudinal direction are pivotally supported by support shafts 20 and 21, are pivotally connected to each other.

Reference numeral 24 denotes a hydraulic device which is an example of an automatic lifting/lowering device for traveling wheels, and includes a single hydraulic pump 25, two hydraulic switching valves 26, 27, two hydraulic cylinder devices 28, 29, and a traveling gear box 2.
It consists of a hydraulic tank that also serves as a hydraulic pump, and a hydraulic pump 25
The hydraulic cylinder device 28, 29 is attached to the upper part of the traveling gear box 2, and has hydraulic cylinder devices 28, 29 protruding from both left and right sides of the rear side of the hydraulic pump. 30, 31
is a swinging rod that is pivoted on the left and right sides separately by vertical pins 33 to a support rod 32 protruding between the hydraulic cylinder devices 28 and 29 on the rear side of the hydraulic pump 25; The tip of the swinging rod 31 and the left chain case 13 are connected to the arm 34, and the tip of the swinging rod 31 and the right chain case 14 are connected to the arm 34, respectively.
35, are interlocked and connected via connecting rods 36, 37, and the left and right intermediate portions of the swinging rods 30, 31 are connected to the pistons 28 of the hydraulic cylinder devices 28, 29.
a, 29a, respectively, and when these pistons 28a, 29a protrude, the traveling wheel 1
1 and 12 are moved downward, and conversely, when pushed in, they are moved upward.

38, 39 are left/right hydraulic switching valves 26, 2
7, the operating rods 38, 39 and the front ends of the upper link rods 22b, 23b of the expansion/contraction links 22, 23 are connected to the arms 40, 41, rods 42, 43.
When the floats 18, 19 move upward over a certain range, the hydraulic switching valves 26, 27 are switched so that the pistons 28a, 29a protrude; The pistons 28a and 29b are configured to be retractable by switching.

44 and 45 are detection devices for detecting the degree of hardness and softness of the field surface, which include narrow cross-sectional sled bodies 44a and 4;
The float 18, 1 is slightly below the upper end of 5a.
9 is pivotally attached to the tips of the links 22 and 2 by horizontal pins 46 and 47, and the expansion and contraction links 22 and 2
Coil springs 48, 49 are interposed between the lower link rods 22a, 23a of 3, and the sled bodies 44a, 45a
The lower part of the holder is provided so that it sinks below the surface of the field due to the elastic force of springs 48 and 49. When the topsoil of the field is hard due to resistance during running, the springs 48 and 49 are strongly pulled to increase the upward movement resistance of the floats 18 and 19, and on the other hand, when the topsoil is soft, the springs 48 and 4 are pulled strongly.
The tensile force of float 9 is weakened, making the upward movement resistance of floats 18 and 19 small.

In the figure, 50 and 51 are transmission belts that transmit power from the prime mover 4 to the hydraulic pump 25 and the transmission shaft of the traveling gearbox 2, respectively, 52 is a planting clutch lever, 53 is a hydraulic operating lever, and 54 is a traveling clutch lever. , 55 is a change lever, and 56 is a bonnet.

Next, the operation of the above example will be explained. First, after storing the seedlings in the seedling tank 7, when each rotating part is driven by the prime mover 4, the rice transplanting machine 1 is moved forward by the rotation of the left and right running wheels 11, 12, and the lower float 15,
18 and 19 land on the field surface and slide. In addition, the seedling tank 7 reciprocates left and right to supply seedlings one by one to the planting rod 10, and the planting rod 10 divides and engages the supplied seedlings while drawing a planting path. Plant on the surface of the field leveled by each float.

Although seedling planting work is carried out in this way, if the depth of the paddy field changes, the running wheels 11,
12, the height of the body 1 above the field surface changes, and the ground pressure of the float attached to the body 1 changes. For example, when the paddy field becomes deep and the aircraft 1 descends and the floats 18 and 19 are pushed up, the expansion and contraction links 22 and 23, the rods 42 and 43, and the arms 4
0, 41, the hydraulic switching valves 26, 27 are connected to the hydraulic cylinder devices 28, 29 via the operating rods 38, 39.
The pistons 28a, 29a of the pistons 28a, 29a are switched in the protruding direction to move the traveling wheels 11, 12 downward to increase the aircraft support force and raise the aircraft 1, causing the floats 18, 19
Maintain the ground pressure at an appropriate level for seedling planting.

On the other hand, if the paddy field becomes shallower, float 18,1
9 starts to float, the hydraulic switching valves 26 and 27 are switched in the opposite direction to the above, allowing the oil in the hydraulic cylinder to return to the hydraulic tank, and the traveling wheels 11 and 12 are moved upward under the weight of the aircraft. The ground pressure of the floats 18 and 19 is maintained appropriately.

In addition, the depth of the paddy field changes in the left and right direction,
When a ground pressure difference occurs between the left and right floats 18 and 19, the left and right running wheels 11,
12 is automatically controlled in the same way as described above, and is always propelled while being held horizontally in the left and right directions.

In this way, the running wheels 11, 12 are always automatically controlled to move up and down in response to changes in the plow in the field. When the field topsoil is hard, the floats 18, 19 move forward by going under the soil surface, and when the top soil of the field is hard, they turn greatly in the direction of arrow B, strongly pulling the springs 48, 49, and applying a large resistance when the floats 18, 19 move upward. The vertical movement of the wheels 19 is slowed down to prevent the wheels 11 and 12 from moving up and down unnecessarily and causing the machine body to vibrate unnecessarily.
On the other hand, when the ground is soft, the sled members 44a and 45a operate in the opposite direction of the arrow B to loosen the springs 48 and 49, allowing the floats 18 and 19 to move upward even with a small ground pressure, thereby reducing the sensitivity of the wheels 11 and 12 to rise and fall. The floats 18 and 19 are controlled to be sensitive so as to prevent them from sinking significantly below the soil surface and to prevent the topsoil from being pushed up. Even if the hardness of the field topsoil differs on the left and right sides of the traveling vehicle body 1, the sled bodies 44a, 45
a independently detects the hardness, and the left and right floats 18,
Adjusting the upward motion resistance of 19 respectively, the traveling wheel 1
The rice transplanter 1 propels the rice transplanter while compensating for the elevation control of 1 and 12.

Therefore, the floats on either side will not sink and be propelled while pushing the topsoil, and the automatic elevation control setting pressure of the traveling wheels applied to the floats can be adjusted depending on the hardness or softness of the topsoil. It accurately propels the rice transplanting machine while changing the rice planting machine, achieves good straightness, and stabilizes the seedling planting depth and plant spacing.

As described above, the present invention provides a rice transplanting machine 1 on the left and right sides having a seedling planting device consisting of a seedling tank 7 for storing seedlings and a planting rod 10 for dividing and planting one seedling from the seedling tank 7. A pair of left and right running wheels 11, 12 that can swing up and down while being rotated by transmission on both sides.
In addition, left and right floats 18 and 19 are provided below the left and right sides of the rice transplanting machine 1, respectively, which slide in contact with the field surface and can swing up and down.
and between the right running wheel 12 and the right float 1
9, when the float moves upward due to ground pressure higher than a certain range of ground pressure, the traveling wheel on the same side as the float moves downward, and conversely, when the ground pressure becomes lower and the float moves upward. When the float moves down, the running wheel on that side moves up and each float 1 is automatically moved up.
A running wheel automatic lifting device 24 that maintains the ground pressure of 8 and 19 within a certain range suitable for seedling planting work.
Detection devices 44 and 45 are installed on both the left and right sides of the rice transplanting machine 1 to detect the hardness and softness of the field topsoil.
The swing operation of the float on the same side as this detection device was made into a running device of the rice transplanter that was linked to increase the upward movement resistance of the float when the field topsoil was hard, and to reduce it when it was soft, thereby increasing the rice field depth. Regardless of how the field changes in the forward direction or in the left and right lateral directions, the left and right running wheels are automatically and independently controlled to raise and lower, allowing the rice transplanter to be reliably propelled. The lifting control sensitivity of the float can be changed appropriately, and even in the case of soft field topsoil, an unexpected situation such as the float sinking and being propelled does not occur, and the float does not sink, and in particular, the field topsoil hardness in the left and right directions changes. Even if the float on the soft side sinks, the float on the hard side will not float and slide, causing fluctuations in the elevation control of the left and right running wheels. , it has the effect of not causing large fluctuations between stocks.

[Brief explanation of drawings]

Figure 1 is a side view, Figure 2 is a plan view of the main parts,
FIG. 3 shows a hydraulic circuit diagram. Symbols in the diagram: 1 is the running vehicle body, 7 is the seedling tank, 10
11 and 12 are planting rods, 11 and 12 are running vehicle bodies, 18 and 19 are left and right side floats, 24 is a running wheel automatic lifting device, and 44 and 45 are detection devices.

Claims (1)

[Claims] 1. A rice transplanting machine is equipped with a seedling planting device consisting of a seedling tank that stores seedlings and a planting rod that divides and plants one seedling at a time from the seedling tank. A pair of left and right running wheels that can swing are provided, and left and right floats provided separately for the left and right sides that slide in contact with the field surface and swing up and down are provided below both the left and right sides of the rice transplanting machine, and the left and right running wheels and the left-hand float, and between the right-hand running wheel and the right-hand float. When the float receives ground pressure higher than a certain range of ground pressure and moves upward, the running wheel on the same side as that float is connected. Conversely, when the float moves downward due to low ground pressure, the running wheels on that side are moved up to automatically maintain the ground pressure of each float within a certain range suitable for seedling planting work. A detection device for detecting the hardness/softness of the field topsoil is installed on both the left and right sides of the rice transplanting machine, and the swing operation of the float on the same side as this detection device is A running device for a rice transplanter that increases the upward movement resistance of the float when the topsoil is hard and decreases it when the topsoil is soft.