JPS61139308A - Acceleration wheel up-and-down controller of rice field working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a propulsion wheel vertical control device for rice field working machines such as walk-behind rice transplanters and seeding machines.

(Prior Art) Conventionally, as seen in Japanese Utility Model Publication No. 51-49301, in a walk-behind rice transplanter, propulsion wheels provided on both the left and right sides of the machine body are provided to be vertically operated by separate hydraulic cylinder devices for the left and right sides. The hydraulic switching valves corresponding to the respective hydraulic cylinder devices are provided so as to be switched by separate grounding bodies installed side by side between the left and right wheels, so that the left and right propulsion wheels can be independently controlled up and down. A configuration in which the aircraft is propelled along the surface of the paddy field was known.

Furthermore, as disclosed in Japanese Patent Publication No. 49-42444, the left and right propulsion wheels are mechanically moved up and down independently, and this vertical movement control is located outside the propulsion wheels. Controls using side grounding bodies have also been known.

(Problems to be Solved by the Invention) In the prior art disclosed in Japanese Utility Model Publication No. 51-49301, the grounding body for switching the hydraulic switching valve is located between the left and right propulsion wheels. Not only does the movement not fluctuate much, making it difficult to control the aircraft horizontally, but it also has the disadvantage of having two grounding bodies lined up between the wheels, which makes mud removal difficult and the grounding bodies becoming muddy during propulsion. This had the disadvantage of increasing propulsion resistance.

Furthermore, in the prior art disclosed in Japanese Patent Publication No. 49-42444, when the rear part of the aircraft is lifted up during a turn, the front part of the side grounding float is naturally raised to the surface of the topsoil. The left and right propulsion wheels will be controlled to move downwards, but at this time, if the aircraft is tilted slightly during a turn, the wheel on the side that is leaning downward will move downward, and at the same time the other wheel that is leaning upward will move downward. This has the disadvantage that the wheels move upward, reducing the propulsion force and causing slippage, making it impossible to turn.Furthermore, if the side ground floats extend further forward than the wheels, the turning radius becomes larger and the ridge There were drawbacks such as the large amount of unplanted plants along the banks.

(Means for Solving the Problems) The present invention takes the following technical means to solve the above problems.

That is, in the present invention, propulsion wheels (17) and (18) are provided on both left and right sides of the fuselage (1), and are moved up and down by separate hydraulic cylinder devices (19) and (20).
1) with a paddy field agricultural machine (2) attached,
A central grounding body (27) that touches the surface of the paddy topsoil at least at a forward position between the left and right propulsion wheels (17) and (18) and moves up and down as the depth of the tiller changes, and the left and right propulsion wheels (17).・(1
8) are provided with side grounding bodies (28a) and (28b) which do not protrude forward from the front end side of the propulsion wheel but are grounded on the topsoil surface of the paddy field and move up and down with changes in the depth of the tiller. The hydraulic switching valves (26a) and (26b) that control the operation of the hydraulic cylinder devices (19) and (20) are connected to both the central grounding body (27) and the side grounding bodies (28a) φ (28b). It is configured to be interlocked so that it can be switched by vertical movement, and this interlocking can be used to switch between the left and right propulsion wheels (17) depending on the central grounding body (17).
・Hydraulic switching valve (26a) φ(
26b) at the same time, and the left and right side grounding bodies (28a
) and (28b), the propulsion of a walk-behind paddy field machine is configured to switch the hydraulic switching valves (26a) and (26b) so that only the propulsion wheel closer to the ground contact side is operated in the downward direction. The configuration is a wheel vertical control device.

(Example) A walking rice transplanter which is an example of the present invention will be described based on the drawings.

(1) is the aircraft, (2) is the paddy a1 as an agricultural machine for paddy fields.
1. (3) is the engine, and (4) is the bonnet.To explain the 6 aircraft (1) in more detail, the engine stand (6) is attached to the front of the traveling mission case (5), and the rice transplanting device (2) is attached to the rear. The configuration includes a machine frame (7) that connects the two.

The rice transplanting device t (2) consists of a planting mission case (8), a seedling tank (9) that reciprocates left and right, a seedling planting tool (10), etc. An elongated handle (11) is attached.

(12) and (13) are preliminary seedling stands integrally attached to the bonnet (4).

(15) and (16) are left and right chain cases, the bases of which are attached to both the left and right sides of the traveling transmission case (5) so as to be freely rotatable around the drive shaft.

(17) and (18) are the left and right propulsion wheels, mounted on the left and right chain cases (15),
It is provided so that it can be moved downward while being rotated by transmission.

(19) and (20) are the left and right hydraulic cylinder devices, and the base sides of the cylinders (19a) and (20a) are attached to the left and right sides of the horizontal frame (21) attached to the tip side of the engine stand (6). An arm (24) is attached so as to be supported by springs (22) and (23), and the tip sides of the pistons (19b) and (20b) are attached to the chain cases (15) and (16) as one body. It is connected to (25).

(26) is a valve case in which a hydraulic pump and a hydraulic tank are integrated, and the left hydraulic switching valve (2
6a), a right hydraulic switching valve (26b) is provided.

(27) is the central grounding body, and the left and right propulsion wheels (17)
(18) In between, at least the forward position of the ground-contacting part is extended to the forward position of the propulsion wheels (17) and (18), and the rear part is pivoted by a horizontal axis attached to the handle (11). The front part is movable up and down.

(28a)" (28b) This is a side grounding body, and its rear part is pivoted about a horizontal axis like the central grounding body, and the front part is movable up and down.The side grounding body ( 28a
)・(28b) has a propulsion wheel (17)・(1
8) is arranged so as not to protrude further forward.

In the hydraulic circuit shown in FIG. 4, (29) and (30) are hydraulic pumps, and (31) is a hydraulic tank.

(32) and (33) are interlocking bodies that interlock the front part of the central grounding body (27) and the left and right hydraulic switching valves (26a) and (26b), and are composed of a rod and a valve switching lever. .

(34) and (35) are left and right side grounding bodies (28a) l
I (28b) and left and right hydraulic switching valves (26a) (
26b) is an interlocking body, and is interlocked by a rod and a link. That is, the support rod (36) is attached to the valve case (26).
) is provided with a support shaft (37), and an arm (39) is inserted into the support shaft (37) and attached to the base side and tip side of the rotatable cylinder (38).
)-(40) are fixed to one body, and a cylinder (4z) is attached to the arm (40) so as to be freely rotatable via a pin (41).
A rod (43) attached to the grounding body (28a) is inserted into this cylindrical body (42), and a shaft (44) that is screwed onto this rod (43) and can be adjusted up and down is provided. ,
Further, the arm (39) is connected to the hydraulic switching valve (26a).
The switch lever (46) is interlocked and connected via a rod (45). Although we have specifically explained the interlocking between the left side grounding body (28a) and the left hydraulic switching valve (26a), it goes without saying that the right side grounding body (28a) and the left hydraulic switching valve (26a) are also interlocked in the same way. Grounding body (28a) - (28b
) moves up, the cylinder body (42) is stopped by the stopper (44).
The valves (26a) and (26b) are switched by pushing up, but when the grounding bodies (28a) and (28b) descend, the valves (26a) and (26b) are switched even when the grounding bodies (28a) and (28b) are at the lowest position. - A floating part is provided to prevent (26b) from switching.

To explain in detail the upper side of the body, during seedling planting, the central grounding body (27) moves up and down depending on the depth of the tiller, being pushed up or suspended on the soil surface. A pair of left and right hydraulic switching valves (26a) - (26b)
is switched, and the left and right propulsion wheels (17) and (18) are simultaneously controlled up and down. Specifically, when the tiller becomes deeper and the grounding body (27) is pushed up, the left and right hydraulic switching valves (2
6a) (26b) is the hydraulic cylinder device (19).
The pistons (19b) and (2'Ob) of (20) are switched to protrude, and the propulsion wheel (17) is rotated by transmission via arms (24) and (25), and chain cases (15) and (16). )・(18) is moved downward. On the other hand, when the plowing platform becomes shallow, the machine body (1) floats up, so the grounding body (27) hangs down, and contrary to the above, the hydraulic switching valves (26a) and (2)
6b) are simultaneously switched and the propulsion wheels (17) and (18
) moves up.

On the other hand, when the machine (1) is tilted due to a difference in height between the left and right tillers, the side grounding body (28a) or (28b) on the side that is tilted downward is pushed up by the soil surface, which causes The side propulsion wheels (17) or (18) are moved down.

Further, even if the side grounding body (28a) @ (28b) moves downward, at this time, it slides between the rod (43) and the cylinder (42), and the arm (40) does not slide at all. Since they are not moved, the hydraulic switching valves (26a) and (26b) do not switch.

Therefore, when making a turn, one aircraft (1) is operated so that its turning side is lowered, but at this time, the propulsion wheel on the turning side automatically moves down, and the propulsion wheel on the opposite side moves up. Since this does not occur, it is possible to turn reliably without muddying the vehicle, and since the side grounding bodies do not extend forward, it is easy to turn, and the turning radius is small, making it possible to turn accurately.

(Operation and Effect) Since the present invention has the above-mentioned configuration, there is less mud pushing when turning, the turning radius can be made small, and moreover, when turning, the wheels on the non-turning side can turn accurately without slipping. During work, the left and right tilt of the aircraft can be automatically corrected and stable propulsion can be achieved.

[Brief explanation of the drawing]

The figures show a rice transplanter according to an embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a partly simplified plan view, Fig. 3 is a side view of the main parts, and Fig. 4 is a side view. The figure is a hydraulic circuit diagram. Symbols in the figure: (1) is the aircraft body, (2) is a paddy field agricultural machine (rice transplanter), (17) and (18) are propulsion wheels, (19)
(20) is a hydraulic cylinder device, (26a,) 11
(26b) shows the hydraulic switching valve, (27) shows the center grounding body, and (28a) and (28b) the Jf side grounding body.

Claims (1)

[Claims] Separate hydraulic cylinder devices (
19)・(20) Propulsion wheels (17
) and (18), and the rice field agricultural machine (
2), the left and right propulsion wheels (17)
- (18) At least at the front position between the central ground contacting body (27) that touches the topsoil surface of the paddy field and moves up and down as the depth of the tiller changes, and on the outside of the left and right propulsion wheels (17) and (18). A side grounding body (28a) that does not protrude forward from the front end of the propulsion wheel but touches the topsoil surface of the paddy field and moves up and down as the depth of the tiller changes.
28b), and the hydraulic cylinder device (19).
(20) Hydraulic switching valve (26a) that controls the operation of
(26b) between the central grounding body (27) and the side grounding body (27).
28a) and (28b), and this interlocking structure causes the left and right propulsion wheels (17) and (18) to move vertically at the same time depending on the central grounding body (17). simultaneously switching the hydraulic switching valves (26a) and (26b) corresponding to both the left and right hydraulic cylinder devices, respectively;
Depending on the left and right side grounding bodies (28a) and (28b), hydraulic switching valves (26a) and (28b) are operated so that only the propulsion wheels closer to the grounding bodies are operated in the downward direction.
26b) A propulsion wheel vertical control device for a walking type paddy field working machine configured to switch.