JPS6131961B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a traveling device for a rice transplanter.
Conventionally, there was a rice transplanting machine in which the propulsion wheel and the float were configured to be linked via an automatic steel raising control mechanism so that when the float rose, the propulsion wheel was lowered, and when the float was lowered, the propulsion wheel was raised. The resistance of the float's vertical movement was set to be optimal at the time of seedling planting. Therefore, when rotating the rice transplanter, the same amount of upward resistance as during seedling planting is applied in the upward direction of the float, so the float pushes against the mud on the soil surface of the paddy field. Large turning resistance occurred, making it difficult to turn in the field.

In addition, in order to eliminate the above-mentioned drawbacks, it may be possible to raise the float by the disengaging action of the seedling planting clutch that is operated when turning, but this configuration causes the float to rise unnecessarily. The propulsion wheels descend significantly, lifting the rice transplanter high above the soil surface, which not only makes turning operations difficult;
There is a drawback that the soil surface cannot be leveled reliably when turning.

This invention aims to eliminate the above-mentioned drawbacks and takes the following technical measures.

That is, the rice transplanting machine 1 has a seedling tank 10 that stores seedlings and a seedling planting device 6 that divides and plants each seedling from the seedling tank, and rotates while partially immersed in the soil. A propulsion wheel 19 and a float 21 that floats and slides on the soil surface are both mounted so as to be able to rise and fall, and the propulsion wheel 19 is lowered between the propelling wheel 19 and the float 21 by raising the float 21. Conversely, the propulsion wheel 1 is moved up and down by the float 21.
Automatic elevation control mechanism A for the propulsion wheels 19
At the same time, the lifting resistance of the float 21 is made variable so that the resistance to the rising side of the float 21 is weakened by the cutting operation of the seedling planting clutch 14 that turns on and off the transmission of the seedling planting device 6. This is the traveling device for the constructed rice transplanter.

This invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 denotes a rice transplanting machine, which has a traveling part transmission case 2 at the front and a planting part transmission case 3 at the rear. An engine stand 4 is provided on the front side of the system case 2, and a prime mover 5 is mounted on this.

Reference numeral 6 denotes a seedling planting device, which is attached to both sides of the lower side of the planting portion transmission case 3 by a swing arm 7 and a crank 8 so as to move up and down in a circular closed trajectory; A seedling-engaging planting claw 9 attached to the tip is provided so as to divide and plant one seedling at a time from a seedling tank, which will be described later.

Reference numeral 10 denotes a seedling tank, which is formed into a rectangular shape in plan view so that plate-shaped seedlings with soil can be placed on its upper surface, and whose lower part is provided on a control handle rod 11 so as to be able to reciprocate from side to side. It is connected to a left-right reciprocating mechanism consisting of a lead cam and a lead metal provided inside through a moving rod 12 and a mounting member 13, and feeds seedlings to the planting claws 9 of the seedling planting device 6 from the lower front end opening. It is configured like this.

Reference numeral 14 designates a seedling planting clutch, which consists of a driven clutch body 14a fixed to a shaft 16 that drives the planting shaft 15 to which the crank 8 is attached, and a drive clutch body 14b loosely fitted to the shaft 16. This drive clutch body 14b is appropriately driven from the prime mover 5 side and is movable in the axial direction by a shifter 17, so that clutch pawls provided on both the driven clutch body 14a and the drive clutch body 14b can be engaged and disengaged. It is set up. Further, a power transmission mechanism is provided from the shaft 16 to reciprocate the seedling tank 10. 18 is a transmission chain.

Reference numerals 19 and 19 denote propulsion wheels, which are rotatably supported on the distal end sides of chain cases 20, 20 which are rotatably pivoted around a drive shaft protruding to both left and right sides of the traveling part transmission case 2, and are freely rotated. It is set up so that it can be raised and lowered.

21 is a float, and the left and right propulsion wheels 19,
19, the rear part is pivotally supported on the rice transplanting machine body 1 by a horizontal shaft 22, and the front part is attached to the rice transplanting machine body 1 by a bending link 23 which can be expanded and contracted.

Reference numeral A denotes an automatic elevation control mechanism for the propulsion wheels, and in the illustrated example, it is based on a hydraulic cylinder device 25 that is controlled and operated by a hydraulic switching valve 24. To explain this in detail, it consists of a hydraulic cylinder 25a, a hydraulic piston 25b, A hydraulic cylinder device 25 consisting of,
The hydraulic pump 26 and the hydraulic switching valve 24 are integrally attached to the hydraulic unit 27, and further,
This is attached to the upper part of the traveling section transmission case 2.

A slide member 29 is provided which is fitted into the tip side of the hydraulic piston 25b and is urged toward the tip by a spring 28, and a balance rod is attached to this slide member via a vertical pin 30 so as to be rotatable within a certain range. 31, and the left and right ends of the balance rod 31 and the rotation boss portions integrally provided on the left and right chain cases 20, 20 are connected to the arm 32 and the interlocking rod 3.
3, and the chain case 20 is configured to rotate downward when the hydraulic piston 25b protrudes.

Reference numeral 24 denotes a hydraulic switching valve, which switches the flow of hydraulic oil between the hydraulic pump 26, the hydraulic cylinder 25a, and the traveling part transmission case 2, which also serves as a hydraulic tank. An L-shaped actuation piece 35 in side view is attached to the fixed valve shaft 34, and one of the actuation pieces 35 is connected to the float 21.
and the other is connected via a wire 38 and a tension spring 39 to a planting clutch lever 37 provided on the control handle 11 to operate the seedling planting clutch 14 on and off. ing. And the hydraulic switching valve 24
are the float 21, the on/off operation position of the planting clutch lever 37, and the on/off operation position of the clutch lever 37.
The relationship is made as follows depending on the strength or weakness of the tension spring 39 as the tension spring 39 is cut.

That is, when the seedling planting clutch 14 is turned on by operating the planting clutch lever 37,
The tensile force of the tension spring 39 becomes stronger, and the float 21 is pressed moderately strongly against the soil surface via the actuating piece 35 and the rod 36, and is set in a state suitable for seedling planting work, and the hydraulic switching valve 24 is set to the float 21. Therefore, it operates so that it is always switched to this optimal state. Furthermore, when the seedling planting clutch 14 is disengaged when turning, the tension spring 39 is loosened via the wire 39, the tension force of the spring 39 is weakened, and the upward movement resistance of the float 21 is reduced, and the hydraulic switching valve 24 is The hydraulic piston 25b is switched by a small amount of ground pressure applied to the float, and the propulsion wheels 19, 19 are lowered.

As shown in FIG. 5, a friction brake 40 is attached to the valve stem 34, and this braking force is applied to the planting clutch lever 37, so that the braking force is weak when the clutch is disengaged, and the braking force is weak when the clutch is engaged. It may be configured to be strong. The friction brake 40 is a friction plate 40a that is wedged to a boss on the side of the transmission case 2 of the traveling part and is urged toward the tip of the shaft by a spring 41.
and a movable friction plate 40b slidably wedged on the valve stem 34.
The movable friction plate 40b is provided so as to be movable in the axial direction by an actuator 42, and the actuator 42
is connected to the planting clutch lever 37 by a wire.

In addition, the symbols in the figure, 43 is a transmission belt, 44 is a pulley provided on the input shaft of the hydraulic pump, 45 is a gear attached to the input shaft 44, 46 is a transmission gear that meshes with the gear 45, and 47 is a bonnet cover. show.

Next, to explain the effect of the above example, first,
The prime mover 5 is started to transmit power to each rotating part, and the planting clutch lever 37 is operated in the direction of arrow A to turn on the seedling planting clutch 14.

Then, the propulsion wheel 19 rotates to propel the rice transplanting machine 1 with the lower float 21 in contact with the soil surface, while the rotation of the crank 8 causes the seedling planting device 6 to perform a shuffling motion and move horizontally back and forth to the left and right. Seedlings are divided into individual seedlings from the front lower end of the seedling tank 10 and planted on the soil surface leveled by the float 21.

Seedling planting work is carried out in this way. During this seedling planting work, as mentioned above, the planting clutch lever 37 is rotated in the A direction to turn the seedling planting clutch 14 into the on position. To do this, the tension spring 39 is strongly pulled through the wire 38, and for this purpose the L-shaped actuating piece 35 and the rod
The float 21 is pressed fairly strongly against the soil surface via the . Since the surface of the plowing table in the field is uneven and the propulsion wheel 19 moves along the unevenness, the front part of the float 21 is pushed up with a force stronger than the downward pressure required to sufficiently level the soil surface. The actuation piece 35 rotates in the direction of arrow B against the tension pressure of the tension spring 39, and switches the hydraulic switching valve 24 so that the oil from the hydraulic pump 26 is discharged into the rear end side chamber of the piston 25b of the hydraulic cylinder 25a. and protrudes the hydraulic piston 25b. Then, the slide member 29, the balance rod 31, the interlocking rod 33, and the arm 32
Both the left and right chain cases 20, 20 rotate in the direction of arrow C to lower the propulsion wheels 19, 19. Then, the propulsion wheels 19, 19 come into contact with the tiller surface and gradually push up the rice transplanting machine 1, and when the ground pressure of the float 21 decreases and reaches a range suitable for seedling planting work, the rod 36 strongly pushes up the actuating piece 35. When the condition is resolved, the hydraulic pressure switching valve 24 is switched to its original neutral state, and the oil from the hydraulic pump 26 is returned to the traveling part transmission case 2 as it is.

Next, the surface of the tiller plate has changed into a convex shape, and the propulsion wheel 19 comes into contact with this convex part and lifts the rice transplanting machine 1 to a high place, causing the lower float 21 to float up and not leveling the soil surface sufficiently. When it becomes impossible to plant seedlings, the float 21 quickly descends under its own weight and the tensile pressure of the tension spring 39, causing the actuating piece 35 to rotate in the opposite direction of the arrow B. Then, the hydraulic switching valve 24 is switched so that the oil from the hydraulic pump 26 is discharged into the front end side chamber of the hydraulic cylinder 25a, and the hydraulic piston 25b is retracted. Then, contrary to the above, the propulsion wheels 19, 19 move upward, and when the optimum seedling planting state is reached, the hydraulic switching valve 24 is switched to the neutral state.

In this way, during the seedling planting work, the automatic elevation control mechanism A works accurately and the work is carried out without variation in the seedling planting depth. Next, when the rice transplanting machine 1 is rotated after planting near the ridge, the planting clutch lever 37 is first rotated in the opposite direction of arrow A to disengage the seedling planting clutch 14.

Then, the wire 38 becomes slack, and the attractive force of the tension spring 39, which was strongly drawing the actuating piece 35, becomes sufficiently weak.

In this state, the side clutch (not shown) on the turning side is disengaged to enter the turning state, but at this time,
Since the float 21 is not strongly pressed against the soil surface, the hydraulic switching valve 24 can switch the propulsion wheel 19 in the downward direction via the rod 36 and the actuating piece 35 even with extremely weak ground pressure of the float 21. Therefore, while the automatic elevation control is effective during this turning, the mud is not pushed by the float 21, so there is little resistance, and it is possible to turn accurately without roughening the field surface.

In the case of the embodiment shown in FIG. 5, if the planting clutch lever 37 is cut during turning, the wire 38
Since the movable friction plate 40b is loosened, the pressing force of the movable friction plate 40b against the friction plate 40a becomes weaker, the braking force is reduced, the valve shaft 34 can be rotated with a small force, and the push of mud by the float 21 can be reduced.

As described above, since the present invention has the above-mentioned configuration, it is possible to utilize the automatic elevation control mechanism of the propulsion wheel with sensitivity suitable for the seedling planting operation in the seedling planting operation state, and to disengage the seedling planting clutch when turning. Accordingly, the sensitivity of the automatic elevation control mechanism is increased to prevent mud from being pushed by the float during turning, while still enabling accurate turning while operating the automatic control.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a working mechanism diagram of the main part, and Fig. 3 is a diagram of the working mechanism of the main part.
Figures 4 and 4 are side views with some of the main parts cut away, and Figure 5.
The figure is a front view of main parts of another example. Symbols in the figure: 1 is the rice transplanting machine, 6 is the seedling planting device, 1
0 is a seedling tank, 14 is a seedling planting clutch, 19 is a propulsion wheel, 21 is a float, and A is an automatic lifting control mechanism.

Claims (1)

[Claims] 1. A rice transplanting machine that has a seedling tank that stores seedlings and a seedling planting device that divides and plants seedlings one by one from the seedling tank, and a propulsion wheel that rotates while partially submerged in the soil and soil. A float that levitates and slides on the surface is mounted so as to be able to rise and fall, and between the propulsion wheel and the float, the propulsion wheel is lowered by the rise of the float, and conversely, the propulsion wheel is lowered by the fall of the float. An automatic elevation control mechanism for the ascending propulsion wheel is provided, and the elevation resistance of the float is variable.
A traveling device for a rice transplanter configured to reduce resistance to the upward direction of the float by a cutting operation of a seedling planting clutch that turns on/off the transmission of the seedling planting device.