JPH0216907A - Walking type rice transplanter - Google Patents

Abstract

PURPOSE:To maintain transplanting depth below mud surface always constant at left and right parts of machine by equipping an operating member of rolling control connecting mechanism with a pair of springs and making the force of each spring variable in the neutral state of a control valve. CONSTITUTION:A bracket 35 through which a rod 19 is passed is extended to an outer wall 32a at the side of a control valve 32 and the rod is engaged with springs 33a and 33b above and below the bracket 35. Plural locating holes 37 are formed at set parts of spring receiving members 36a and 36b of the rod 19. Force controlling mechanisms 34a and 34b consist of the spring receiving members 36a and 36b, the locating holes 37 and a pin 38. Consequently, sensitivity in left and right grounding detection of grounding float can be regulated by difference in force of both the springs separately at the left and the right and feed back value to rolling drive mechanism can be properly compensated depending upon operation condition.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention has a ground float mounted at the lower center of the fuselage that can be pivoted to roll freely around the longitudinal axis at the lateral center based on left and right ground pressure fluctuations. In addition to supporting the
Equipped with a rolling drive mechanism that rolls the aircraft,
The present invention relates to a walk-behind rice transplanter in which a control valve operating member for hydraulically controlling the rolling drive mechanism and the grounding float are interlocked via a mechanical linkage mechanism.

[Conventional technology]

As this type of walking rice transplanter, for example,
As disclosed in Japanese Patent No. 6206, there was a structure in which a drive member erected from a ground float and an operating member of the control 7XI lube were directly brought into contact with each other by means of an elongated hole and a pin.

[Problem to be solved by the invention]

The above conventional structure is designed to ensure that the rolling action of the ground float is transmitted to the control valve.
For example, if the mud surface in the seedling planting area is extremely soft, the ground float will tend to sink into the mud surface as the aircraft tilts, making it difficult to accurately detect the mud surface, which is the original function of the ground float. In addition, depending on the mounting position of the control valve, there is a risk of differences in control characteristics due to dimensional errors when rolling from the neutral position to the right or left, and There was a problem that needed to be improved: the planting depths were different.

An object of the present invention is to eliminate the above-mentioned disadvantages and to make it possible to correct the rolling control characteristics depending on the work situation.

[Means to solve the problem]

A feature of the present invention is that, in the walk-behind rice transplanter having the configuration described in 1, a pair of springs are provided in the linkage mechanism to bias the operating member in forward and reverse operating directions, and the control valve is in the neutral position. A pair of biasing force adjustment mechanisms are provided that can change the biasing force of each spring in the state, and the functions and effects thereof are as follows.

[For production]

In other words, by adjusting the biasing force adjustment mechanism separately, the sensitivity of the left and right ground contact detection of the ground float can be adjusted to the left and right, depending on the hardness of the mud on the field or the difference in the characteristics of the control valve in the forward and reverse directions. Since it can be adjusted by the difference in the biasing force of the springs, the feedback value to the rolling drive mechanism of the aircraft body accompanying the rolling operation of the ground float can be corrected to an appropriate value depending on the work situation.

〔Effect of the invention〕

As a result, the planting depth of the seedlings relative to the mud surface can always be maintained constant on the left and right sides of the fuselage, and this can be achieved with an extremely simple structural modification of adjusting the spring biasing force.

〔Example〕

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

FIG. 1 shows a walking rice transplanter according to the present invention. This walk-behind rice transplanter has an engine (1) and a mission case (2) at the front of the machine body (V), and a transmission case (3) that also serves as the machine frame and extends from the rear end of the mission case (2).
) A seedling planting device (7) as a working device consisting of a planting case (5), a seedling stand (4), and a seedling planting mechanism (6) at the rear end;
Left and right wheels (8) that can swing up and down around the horizontal axis of the mission case (2).

(8), and a grounding float (9) is arranged between the left and right wheels (8).

The grounding float (9) is a fulcrum (P,) on the rear side of the aircraft.
It can be freely swung up and down around the center of the horizontal axis (
P2) It is pivoted to the traveling body (V) so that it can roll freely around the center float (9), and the relative height of the left and right wheels (8), (8) is adjusted by the rolling operation based on the ground pressure fluctuation of the center float (9) on the mud surface. The structure is such that the rolling attitude of the aircraft body, that is, the seedling planting device (7) relative to the ground, can be maintained in a parallel attitude to the mud surface by changing the height.

In other words, as shown in FIGS. 3 and 4, the ground float (9) connects the front pivot bracket (10) to the fuselage side bracket via the pin (11) along the longitudinal direction of the fuselage.
(12) so that it can swing relative to the fuselage longitudinal axis (P
2) It is pivoted around it so that it can be rolled freely. The fuselage side bracket (12) includes a first bracket (12a) which is shaped like an opening in plan view and is attached to the engine frame (13) so as to be vertically swingable about the horizontal axis (P),
(12t) (12t)
The lower end of the second bracket (12b) is loosely fitted onto the pin (11) and linked to the ground float (9).

At the rear of the grounding float side bracket (10), there is a link, which is an example of a mechanical linkage mechanism, between a plate-shaped drive member (14) and a rolling control mechanism (^) as described later on the upper surface of the mission case (2). They are linked by a mechanism (15).

This link mechanism (15) includes an operation pin (16) that is connected to the drive member (14), and an operation pin (16) that is connected to the drive member (14).
It consists of a bell crank (17) fixed to the ground float (17) and a rod (19) linked to the actuating arm (18) which is the operating member of the rolling control mechanism (A), and which controls the rolling of the ground float (9). It has a function of transmitting the operation to the rolling control mechanism (A). The driving member (14)
A vertically elongated hole (20) is formed at the center position in the width direction of the grounding float (9) and for abutting engagement with the operation bin (16). It is configured to be able to move up and down within the vertical range of the elongated hole (20). Further, a turnbuckle mechanism (21) is provided in the middle of the rod (19), and the left and right wheels (8), (8
) is configured to be able to adjust the rolling control mechanism (A) to a neutral posture state in which the rollers are set at the same height.

A long hole (22), which is also vertically long, is provided on the lateral side of the long hole (20), and is fitted onto an engagement pin (23) extending from the engine frame (13).

The melting point roller (24) is attached to the tip end portion of this engagement pin (23).
) is externally fitted to allow smooth vertical movement relative to the elongated hole (22), and the upper and lower middle portion width (S) of the elongated hole (22) is set to the diameter (D) of the melting point roller (24). The structure is such that the center float (9) is allowed to roll within a certain range.

In addition, if the center float (9) rises relative to the traveling aircraft near a ridge, or descends while driving on the road,
The engagement pin (23) fits into the narrow diameter portions of the upper and lower ends of the elongated hole (22) to form a check mechanism (B) that holds the center float (9) in a constant position and prevents rolling operation. be.

Next, the elevating and rolling drive system on the traveling body (V) side will be explained. In other words, as shown in Figures 1 and 2,
Wheel transmission case that pivotally supports the left and right wheels (8), (8)
25) and (25) are pivotally supported to the transmission case (2) so as to be able to swing up and down, and this wheel transmission case (25) is
), (25) a bracket (26) erected at the base end,
(26) and the balance arm (29) attached to the piston rod (28) of the lifting cylinder (27>) are connected by the left and right linking rods (30a) and (30b), and the left and right wheels (8) , (8) at the same time in the same direction.On the other hand, a part of the right connecting rod (30b) is a hydraulic cylinder (an example of a rolling drive mechanism that rolls the aircraft by hydraulic drive). 31), and the piston rod of the balance arm (29) is caused by the expansion and contraction of this hydraulic cylinder (31)28)
By horizontal swinging around the vertical pivot point (P5),
Left and right wheels (8).

(8) constitutes a rolling control mechanism (8) that relatively moves up and down.

This rolling control mechanism (A>
9) Front and rear axis (P2) based on ground pressure fluctuations on the mud surface
), the driving member (14
) moves in conjunction with each other, and the control valve (32) that controls the hydraulic pressure of the rolling hydraulic cylinder (31) is moved to the operating arm (18) via the operating pin (16), bell crank (17), and rod (19). ) to perform rolling control.

Then, the link mechanism (15) is connected to the actuating arm (
When a pair of coil springs (33a) and (33b) are provided that bias the control valve (32) in the forward and reverse operation directions, the coil springs (33a) and (33b) bias the control valve (32) in the neutral state.
A pair of urging force adjustment mechanisms (34a) and (34b) are provided that can change the urging forces of 33a) and (33b).

To explain in detail, as shown in FIG.
A bracket (35) through which the rod (19) is inserted is extended to the side outer wall (32a) of 2), and this bracket)
The coil springs (33a) and (33b) are externally fitted to the rod (19) above and below the coil springs (33a) and (33b), and the coil springs (33a) and (33b) are slidable on the rod (19) above and below. The spring holder extrapolated to the member (36
a) (36b) is provided. And rod (19)
The spring receiver has a plurality of positioning holes (37) formed in the mounting portions of the members (36a) and (36b), respectively, and the bottle (38) can be freely inserted into and removed from any of the positioning holes (37). The spring receiver is configured to receive the members (36a) and (36b). In this way, the spring receiver is configured to adjust the biasing force adjustment mechanism (34a) by the members (36a), (36b), the positioning hole (37), and the pin (38).
(34b) is configured.

With the above configuration, the biasing force of both coil springs (33a) (33b) is reduced when there is a difference in the characteristics of the control valve (32) for rolling operation from the horizontal neutral state to either the rightward downward direction or the leftward downward direction. It is possible to correct the difference in

Alternatively, if the mud surface is extremely soft, use a ground float (
9) does not sink due to the inclination of the aircraft, the biasing forces of both coil springs (33a) and (33b) can be equally changed to provide an appropriate neutral biasing force.

[Another example]

(2) The spring receiver may be formed integrally with the members (36a) and (36b).

■ The biasing force adjustment mechanisms (34a) and (34b),
It may be configured as described below.

That is, as shown in FIG. 6, detection arms (39a) for detecting the hardness of the mud surface are installed on the left and right sides of the fuselage (V).
(39b) are arranged so as to be able to swing up and down about their horizontal axes, and the coil springs (39b) are attached to both ends of the arm (40) which swings with the rolling operation of the grounding float (9).
Attach one end of each of coil springs (33a) and (33b), and attach the other ends of the coil springs (33a) and (33b) to the detection arm (
39a) and (39b), the wires (42a) and (42
b) are interlocked.

With this configuration, for example, if the mud surface on the left side is hard and the mud surface on the right side is soft, the left detection arm (3
9a) is swung upwards from the right side detection arm (39b), and the grounding 7o-to (9) is moved downward from the left side and from the right side via the wires (42a) and (42b). Both coil springs (33a),
The tensile force of (33b) is adjusted. As a result, it becomes possible to control the soil surface posture to an accurate position, and the planting depth of seedlings can be maintained at a constant level.

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 walking rice transplanter according to the present invention, and the first
The figure is an overall side view, Figure 2 is a plan view, Figure 3 is a front view of the link mechanism installation part, Figure 4 is a side view of the link mechanism installation part,
FIG. 5 is a side view of the main part, and FIG. 6 is a perspective view of the main part of another embodiment. (9)... Ground float, (15)...
Interlocking mechanism, (18)... Operating member, (31).
...Rolling drive mechanism, (32)...
Control valve, (33a), (33b)... Spring, (34a), (34b)... Biasing force adjustment mechanism.

Claims (1)

[Claims] A ground float (9) is supported at the lower center of the fuselage so that it can roll freely around the front-rear axis (P_2) at the lateral center based on left and right ground pressure fluctuations, and the aircraft is rolled by hydraulic drive. Rolling drive mechanism (3
1), and the operating member (18) of the control valve (32) that performs hydraulic control of the rolling drive mechanism (31) and the ground float (9) are interlocked via a mechanical linkage mechanism (15). The linked walking type rice transplanter is provided with a pair of springs (33a) and (33b) that bias the operating member (18) in forward and reverse operating directions, respectively, in the linking mechanism (15). , a pair of biasing force adjustment mechanisms (34a), (34b) capable of changing the biasing force of each of the springs (33a), (33b) when the control valve (32) is in a neutral state;
) A walking rice transplanter.