JPH025370B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a sensor float for automatically raising and lowering a wheel relative to an aircraft, in a state in which the front end side located ahead of the wheel swings up and down about a pivot point behind the axle. The present invention relates to a sensor float mounting structure for a walk-behind rice transplanter, in which a seedling planting device is provided behind the axle and is capable of rising above the ground as the rear of the machine is lifted around the axle.

The above walk-behind rice transplanter uses sensor floats to detect changes in the level of the hard bed, and based on this, raises and lowers the wheels relative to the machine body, keeping the height of the machine body relative to the planting mud surface almost constant, that is, the seedling planting device. It is possible to maintain a constant planting depth by maintaining the level of the soil relative to the planting mud surface almost constant, and by providing the front end of the sensor float ahead of the wheels, when turning on the headland, As the rear part of the aircraft is lifted with the handle, the sensor float approaches the aircraft, and the control mechanism is activated accordingly, and the wheels are automatically lowered relative to the aircraft, lifting the aircraft and the seedling planting device, and when turning. In addition to making it easier to lift the aircraft, the pivot point for rocking the sensor float is located behind the axle, and the amount of lift of the front end of the sensor float relative to the aircraft is reduced compared to the amount of lift of the rear of the aircraft during a turn. so that it becomes larger,
The amount of lifting of the aircraft during turning is minimized, making turning operations easier.

However, in the past, the grounding part of the sensor float was located from the sensor float pivot point to the front of the wheels, and as a result, the length of the sensor float before and after touching the ground was too long, causing the aircraft to become unsteady during seedling planting. When steering without lifting the rear part, an extremely large amount of mud is pushed by the sensor float, requiring a large amount of force for steering, and the flowing mud may push down the already planted seedlings. The mass of the sensor float increases,
The drawback was that sensitive detection operations could not be performed.

In view of the above-mentioned drawbacks, the present invention prevents the occurrence of mud pushing due to the sensor float and improves the detection sensitivity of the sensor float while maintaining the excellent function of easily performing turning operations using the sensor float. The purpose is to

The characteristic configuration of the sensor float mounting structure of the walking rice transplanter according to the present invention is that the rear end of the grounding part of the sensor float is arranged forward of the axle, and a non-grounding type connecting member is provided between the float grounding part and the pivot part. The functions and effects are as follows.

In other words, by connecting the sensor float grounding part to the pivot part behind the axle using a non-grounding type connecting member and positioning the sensor float grounding part forward, the aircraft can turn by the action of the sensor float as the rear of the aircraft is lifted. Without compromising the conventional technical intention of making operations easier, the length of the sensor float before and after touching the ground has been significantly reduced, allowing for mud pushing by steering operations during planting without lifting the aircraft. The amount can be very small, the planting direction can be easily corrected, and the already planted seedlings can be effectively avoided from being pushed over by mudflow. Also, since the weight of the sensor float can be reduced, it can be easily adjusted to correct the planting direction. The followability and response sensitivity have been sufficiently improved, making it possible to stabilize the planting depth of seedlings with even greater precision.

Hereinafter, embodiments of the configuration of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, an engine 2 and a transmission case 3 are provided at the front of the fuselage frame 1, and a planting claw 1 driven by the engine 2 is provided at the rear.
9, a seedling planting device 4 equipped with a seedling platform 25 that is laterally reciprocated, and a soil leveling float 5, and a control handle 7 located rearward from the planting mechanism case 6.
The left and right transmission cases 8, 8 are extended and are attached to the transmission case 3 so as to be vertically swingable, and wheels 9 are mounted on respective shafts to form a walk-behind rice transplanter for planting four rows.

As shown in FIG. 2, a support shaft 28 to which a large number of L-shaped seedling holding stays 27 are fixed is pivoted to a pair of left and right support arms 26 protruding from a seedling stand 25, and the right side support A two-position stable switching mechanism consisting of a coil spring 29 and a swinging arm 30 that rotates integrally with the support shaft 28 is provided on the outer surface of the arm 26, and the seedling holding stays 27 are placed in the seedling holding state and retracted from the seedling mounting table 25. It is configured so that it can be switched between the two states, thereby making it easy to carry out seedling loading work. Also, the stopper 3 that comes into contact with the arm 30
1 is provided to restrict the position of the stay 27 so that the stay 27 does not act on the seedlings in the normal position in the seedling holding state, thereby preventing damage to the seedlings.

As shown in FIGS. 3 and 4, a hydraulic cylinder 11 is interlocked and connected to an intermediate member 10 that is attached to the fuselage frame 1 so as to be slidable in the longitudinal direction of the fuselage. 8,8
The left and right wheels 9, 9 are connected together via a rod 13, and the left and right wheels 9, 9 are driven to move up and down with respect to the body as the cylinder 11 expands and contracts.

The front end of the sensor float 14 is located forward of the wheels 9 and is connected to the front end of the fuselage frame 1 via the bending link 15, and the rear end of the ground contact portion 14a of the sensor float 14 is connected to the axle.
It is located in front of the axle P ₁ and connected via a support rod 32 that does not touch the ground to a pivot 35 rearward of the axle P ₁ so as to be vertically swingable around the horizontal axis P ₂ .

The sensor float 14 is operatively connected to a bell crank 18 which is operatively connected to a control valve 17 for the hydraulic cylinder 11 by a linking rod 16, and the sensor is connected between the spring receiving member 20 attached to the fuselage frame 1 and the linking rod 16. A compression coil spring 21 is interposed to urge the float 14 to swing in the downward direction, and the control valve 17 is automatically switched as the sensor float 14 moves up and down relative to the aircraft. 9, 9 are driven up and down, the position of the sensor float 14 relative to the body is maintained within a set range regardless of changes in the level of the hardboard, and the planting depth is made constant.

In the planting clutch lever 23 shown in FIG. 1, although not shown, the lever guide is equipped with a locking part that allows automatic wheel elevation control while cutting and operating the planting clutch. At times, when only the planting clutch is disengaged, by lifting the rear part of the fuselage using the handle 7, the sensor float 14 is forcibly swung upward by the ground reaction force, and the wheels 9, 9 are driven downward. This makes it possible to easily lift the aircraft body and the seedling planting device 4 when turning.

As shown in FIGS. 4 and 5, a bank-like protrusion 33 is provided on the front peripheral edge of the sensor float 14 to prevent mud, etc. from entering the upper surface of the sensor float 14 when the rear part of the aircraft is lifted. A groove 36 is provided on the bottom surface to prevent mud from pushing against the sensor float 14, and ground leveling members 34 having an angle of attack are formed on both sides of the rear part of the sensor float 14, so that when the aircraft tilts forward and makes a turn, the sensor float 14 14, so that the mud accumulated in the recess surrounded by the side part 34 and the ground leveling member 34 is quickly flowed out along the slope thereof,
It is designed to suppress mud pushing.

Furthermore, as shown in Fig. 6, the sensor float 1
A support rod 32 is attached to the upper rear end of the groove 36 of No. 4, and the rear end of the support rod 32 is attached to a swing shaft 37 that changes the installation height of the soil leveling float 5.
5, it may be pivotally supported so as to be swingable around the horizontal axis _P2 .

In addition, the support rod 32 may be formed integrally with the sensor float 14, for example, and its axle _P1
The bottom part on the rear side may be made higher so that it does not touch the ground, and the structure can be changed as appropriate.
These are collectively referred to as non-grounding type connecting members 32.

INDUSTRIAL APPLICATION This invention is applicable to the sensor float mounting structure of the walk-behind rice transplanter of various specifications.

[Brief explanation of drawings]

The drawings show an embodiment of the sensor float mounting structure for a walking rice transplanter according to the present invention, in which FIG. 1 is an overall side view of the walking rice transplanter, FIG. 2 is a partial perspective view of a seedling platform, and FIG. FIG. 4 is an enlarged side view of the main parts, FIG. 4 is a plan view showing the wheel lifting mechanism, FIG. 5 is a sectional view taken along the line - in FIG. 4, and FIG. 6 is a perspective view of the main parts showing another embodiment. . 9...Wheel, 14...Sensor float, 14
a... Float grounding part, 32... Non-grounding type connecting member, 35... Pivotal part.

Claims (1)

[Claims] 1. A sensor float 14 for automatically raising and lowering the wheel 9 relative to the aircraft is provided in such a state that the front end side located in front of the wheel 9 swings up and down about the pivot point 35 rearward of the axle _P1 , and A walk-behind rice transplanter 4 is provided with a seedling planting device 4 behind the wheels 9 so as to be able to rise above the ground as the rear of the machine body is lifted around the axle P ₁ , wherein the sensor float 1
The rear end of the grounding part 4 is arranged forward of the axle 9, and the floating grounding part 14a and the pivot part 35
This is a sensor float mounting structure for a walking rice transplanter in which a non-grounding type connecting member 32 is provided over the entire area.