JPH0216908A - Working machine for use in paddy field - Google Patents

Abstract

PURPOSE:To suppress hunting phenomena of working machine by setting a displacement suppressing mechanism to provide a connecting mechanism of a grounding float and a rise and fall mechanism with a changeable friction resisting force. CONSTITUTION:One end of an inner wire 23a of a release wire 23 is connected through a bracket 22 on the top of a front side of a grounding float 16 and the other end of the inner wire 23a is connected to a spool operation mechanism 25 of a control valve 24 to carry out hydraulic pressure control of a hydraulic cylinder for raising and lowering a working machine. A displacement suppressing mechanism 32 to provide friction resisting force against displacement of the inner wire 23a followed by vertical movement of the grounding float 16 is set in the vicinity of the grounding float in the middle part of connection of the release wire 23 in such a way that the resisting force can be varied and regulated. Consequently, displacement of connecting mechanism is suppressed depending upon unevenness of the surface of paddy field on the difference in hardness of mud and hunting phenomena resulting from fine vibration of the working machine are suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a grounding float that is movably movable up and down on a working machine, and is provided with an elevating drive means that can drive the working machine up and down from the ground. The present invention relates to a paddy field working machine in which a ground float and the lifting drive means are interlocked and connected via a mechanical linkage mechanism so that the working machine is raised and lowered from the ground as the working machine moves up and down.

[Conventional technology]

In the conventional riding-type rice transplanter, which is an example of the above-mentioned paddy field working machine, as shown in Japanese Utility Model Application Publication No. 61-105422, bending occurs as the seedling planting device, which is an example of the working machine, goes up and down. The link mechanism and the control pulp spool operating mechanism, which is an example of an elevating drive means, are directly linked via a release wire.

[Problem to be solved by the invention]

The above conventional structure takes into consideration that even if the traveling machine moves up and down due to unevenness of the tiller, the seedling planting device follows the mud surface and drives up and down as the ground pressure of the ground float changes. It is something.

However, as mentioned above, the structure is such that the relative vertical movement caused by the ground pressure of the ground float is directly transmitted to the above operating mechanism, so if the plowing platform or mud surface has many small irregularities, the above-mentioned This kind of lifting and lowering drive is frequently repeated, and there is a problem in that a hunting phenomenon occurs in which the work machine vibrates.

As a way to solve the above problem, it has been considered to use a hydraulic shock absorbing mechanism, for example, but this has the disadvantage of complicating the structure and increasing costs.The purpose of the present invention is to solve the above problems and The aim is to obtain something that can suppress the hunting phenomenon with a simple structure.

[Means to solve the problem]

In the paddy field work machine having the structure described in 1 above, the present invention provides a displacement suppressing mechanism that applies a frictional resistance force to displacement caused by vertical movement of the ground float, in an intermediate portion of the linkage mechanism, and the resistance force can be changed and adjusted. The functions and effects are as follows.

[Function] In other words, since the displacement suppressing mechanism is provided in the linkage mechanism that transmits the vertical displacement of the ground float to the lifting drive means as mechanical displacement, it is possible to control the condition of the field, such as the number of irregularities. According to the difference in mud hardness, an appropriate frictional resistance force can be applied, and displacement of the linkage mechanism can be suppressed. In this way, it is possible to perform appropriate elevating and lowering control over large irregularities while suppressing the hunting phenomenon described above.

〔Effect of the invention〕

As a result, the hunting phenomenon can be suppressed by an extremely simple structural improvement that adds frictional resistance to the mechanical linkage mechanism while maintaining the lifting control function of the working machine in an appropriate state. has become possible.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows an overall side view of a riding type rice transplanter which is an example of a paddy field working machine according to the present invention. This rice transplanter is constructed by connecting a seedling planting device (A) to the rear part of a riding type traveling body (V) via a link mechanism (1) so that it can be driven up and down. As shown in Figure 5, the traveling body (V) is equipped with an engine (3) inside the front bonnet (2), and the power of this engine sink (3) is transmitted from a horizontal output shaft (4) to a belt. Transmission mechanism (5), hydrostatic continuously variable transmission (hereinafter H
3T) (6) and a driving transmission (7), it is configured to be transmitted to the rear wheels (8). On both the left and right sides of the bonnet (2), the operating step part (10) of the control part (9) in the center of the aircraft is connected to the front, and protrudes laterally outward from the bonnet (2) for boarding. Step portions (11), (11) and (11) are formed. Also, the right side boarding step part (1
1) is also used as the oil tank for the charging operation port of the HST (6). In this way, the structure is such that the water droplet that falls from the seedlings placed on the preliminary seedling stand (12) provided above can be used as the cold section for the hydraulic oil.

Next, the structure of the seedling planting device (^) will be explained.

The seedling planting device (A) includes a transmission case (13) that is connected to the link mechanism (1) and serves as a working machine that also serves as a support frame, and a seedling stand (14) provided on the upper part of the transmission case (13). ), a seedling planting mechanism (15) installed at the rear of the transmission case (13), a grounding float (16) that touches the mud surface at the bottom, and a fertilizer application device (17) that drops fertilizer as the seedlings are planted. This seedling planting device (A) is configured to be able to be driven up and down by the telescopic drive of a hydraulic cylinder (18) installed on the traveling body (V) side.

The grounding float (16) is pivotally supported on the transmission case (13) so as to be able to swing up and down around the rear transverse support (x1), and on the side thereof, a mechanism provided at the lower end of the fertilizer application device (17) is connected to the transmission case (13). A mooring board (20) for leveling the ground by closing the groove for inserting the manure layer formed in the mud surface by the groover (19) is attached in a height-adjustable manner. In other words, as shown in FIG. 6, there are a plurality of recesses (21
) to form one of the recesses (2+)! Alternatively, a groove is formed so that the height can be adjusted by fitting and fixing the earthen board (20).

The grounding foot (16) is a seedling planting device (2・＼)
In other words, the transmission case (13) serving as a work machine is interlocked with the lifting drive means (C) capable of driving the transmission case (13) up and down from the ground via the body linkage mechanism.

In detail, as shown in FIG. 1, the ground float (
16), the inner wire (2) of the release wire (23) is inserted through the bracket (22).
Connect one end of this inner wire (23a)
The other end is connected to a spool operating mechanism (25) of a control valve (24) that controls the hydraulic pressure of the lifting hydraulic pressure/cylinder (18).
It is linked to. The hydraulic cylinder (18) and control valve (24) are referred to as a lifting drive means (C).

The spool operating mechanism (25) rotates a swing arm (
The spool (29) of the control valve (24) is pushed or pulled by the swinging operation of the control valve (28). Further, the spool (29) is constructed so that it can be pushed or pulled by swinging a manual lever (30).

More specifically, when the traveling body (V) rides on the convex part of the tiller and the ground float (16) rises from the mud surface, the inner wire (23a) is pulled by its own weight, and the control valve (24) is pulled. ) is set to the lowered position (CI), and the seedling planting device (A> is lowered to bring the spool (29) to the neutral position (n).

Also, when the machine body (V) sinks into the recess of the tiller, the inner wire <23a> becomes loose, and the tension spring (26) sets the spool (29) to the raised position (u), causing the spool ( 29) until it reaches the neutral position (n).
8).

A grounding float (16) is placed near the grounding float (16) in the middle of the connection of the release wire (23).
A displacement suppressing mechanism that provides a frictional resistance force against the displacement of the inner wire (23a) accompanying the vertical movement of the inner wire (23a) is provided so that the resistance force can be changed and adjusted.

Specifically, as shown in FIGS. 2 and 3, a part of the outer wire (23b) of the release wire (23) is cut out, and the outer part of the inner wire (23a) exposed near the cutout is removed. A suppressing member (32) as a displacement suppressing mechanism is provided with three sliding contact portions (31a), (31b), and (31c) that can be selectively slidably contacted on the surface.

In other words, the suppressing member (32) is rotatably supported by the supporting member (23c) around the axis (x2), and is rotated to prevent the sliding contact portions (31a), (31b), (31c) from rotating. )
It is configured so that either one of the inner wires (23a) can be switched and adjusted to be in sliding contact with the inner wire (23a), and each sliding contact part (31a)
, (31b) and (31c) are each provided with an elastic body such as rubber, and are formed to have different sliding contact areas, so that the friction resistance against the inner wire (23a) is different.

In this way, the hunting phenomenon caused by minute vibrations can be suppressed by an extremely simple structural improvement in which the mechanical linkage mechanism is made adjustable to change the frictional resistance force.

[Another example]

■ The displacement suppressing mechanism (32) may be configured such that an elastic body (34) for imparting frictional resistance is provided at the tip of the rotation adjustment screw (33), as shown in FIG. .

(2) In addition, if the displacement suppressing mechanism (32) is installed near the control valve (24), it is possible to avoid the adverse effects of mud scattering, etc., and it can be used stably for a long period of time, resulting in further practical convenience. will increase.

The present invention is applicable not only to riding-type rice transplanters but also to various rice paddy working machines such as walking-type rice transplanters.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice paddy work machine according to the present invention, FIG. 1 is a system diagram showing the linkage structure for lifting and lowering, FIG. 2 is a cutaway side view of the main part, and FIG. 3 is a cross-sectional view of the main part. , FIG. 4 is an overall side view, FIG. 5 is a plan view of the front part of the fuselage, FIG. 6 is a partial sectional view of the grounding float, and FIG. 7 is a longitudinal sectional view of another embodiment. (13)...Work machine, (16)...
Ground float, (23)... mechanical linkage mechanism,
(32)...Displacement suppression mechanism, (C)...
- Lifting drive means.

Claims (1)

[Claims] A ground float (
16) and is equipped with a lifting drive means (C) capable of driving the work machine (13) up and down from the ground, so that the work machine (13) can be raised and lowered from the ground in accordance with the vertical movement of the ground float (16). A paddy field working machine in which a grounding float (16) and the lifting drive means (C) are interlocked and connected via a mechanical linkage mechanism (23), wherein the linkage mechanism (23)
), a displacement suppressing mechanism (3
2) A paddy field working machine that is equipped with a variable and adjustable resistance force.