JPS5915854Y2 - Swing device of walking rice transplanter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a swing device for a walk-behind rice transplanter, and more particularly, to a swing device that locks the lower wheels from lowering when there is a significant difference in height between the left and right wheels.

A walk-behind rice transplanter has wheels on the left and right sides, and a float is attached to the rice transplanter body so that it receives buoyancy from the rice field and bears part of the weight of the rice transplanter body as it moves around the field. The planting machine placed at the bottom of the planter is always kept at a constant height relative to the field surface during work, and even if the wheels of the rice transplanter move up and down due to the unevenness of the tiller, the seedlings are planted at a constant depth. It is designed to be.

For this purpose, it is necessary that the left and right wheels of the walk-behind rice transplanter move up and down with respect to the rice transplanter body, and that the left and right wheels move up and down independently.

Therefore, walk-behind rice transplanters are equipped with a device that forces the left and right wheels to partially conform to the unevenness of the tiller, but this device usually consists of a single hydraulic cylinder. It has a swing device to ensure that the left and right wheels are firmly in contact with the ground even when they are placed on plowing platforms of different shapes (heights).

This swing device is designed to ensure that the left and right wheels of the grass transplanter are securely in contact with the tiller and do not lose driving force due to the expansion and contraction of one cylinder unit.

Its structure is such that a hydraulic cylinder unit is arranged in the length direction of the rice transplanter, and the center part of a balance lever arranged in the width direction of the rice transplanter is pivotally supported at the tip of the piston rod. One end of the connecting rod is connected to the top, and the other end is connected to a swing arm that also serves as a chain transmission case and swings the wheels up and down, and the left and right wheels are on plowing platforms of different heights and depths. However, the balance lever rotates within an appropriate range around the pivot point at the end of the piston rod, allowing the left and right wheels to be grounded.

However, when there is an extreme difference in height between the left and right wheels of a walk-behind rice transplanter, especially when the lower wheel has descended completely, it is necessary to lock this state and allow the other wheel to move up and down. It is.

When only one wheel is lowered, the cylinder unit of the swing device is in an extended state, and the balance lever is normally perpendicular to the piston rod, but it is tilted to an oblique state. Become.

In this case, if there is no limit to the lowering of the lower wheels, the higher wheels may be pulled up and the rice transplanter may tilt significantly in the width direction.

Therefore, the present invention is designed to lock the downward movement of one wheel when there is a significant difference in height between the left and right wheels, and to provide a slight cushion to the other wheel even in this state. It is characterized in that the connecting rod is pivotally connected to the take-up lever which is pivotally connected to the piston rod constituting the cylinder unit, and the rotational movement around the pivot point is restricted within a certain range. It is something to do.

Hereinafter, details of the present invention will be explained with reference to the accompanying drawings.

First of all, in Fig. 1, reference numeral 1 indicates the main body of the walking rice transplanter, and the swing arm 4, which also serves as a transmission case with a built-in chain etc., can swing vertically, with the transmission shaft 3 to which the output of the engine 2 is transmitted as the pivot point. Wheels 5 are attached to the free ends of the wheels 5 via drive shafts 6, and are arranged symmetrically on both the left and right sides.

Therefore, for example, the wheel 5 is configured to move up and down due to the circular movement of the swing arm 4 about the transmission shaft 3 in response to unevenness of the tiller.

Furthermore, a float 7 is attached to the lower part of the rice transplanter main body 1 by a movable member such as a link, so that a part of the weight of the rice transplanter main body 1 can be borne by the buoyancy exerted by the float 7 within the circular plane of the field. and this float 7
One end of a plowing depth sensor rod 8 is attached to the plowing depth sensor rod 8, which detects the depth of the plowing platform and operates a hydraulic system switching valve of a swing device, which will be described later.

A seedling stand 9 is attached to the rear end of the rice transplanter main body 1, and the seedlings m are planted while being cut out by a planting machine placed at the lower end thereof.

A hydraulic cylinder unit 11 that constitutes the swing device 10 and serves as a drive source for the swing is arranged at the center position in the width direction of the rice transplanter main body 1, and an oil path of a hydraulic system that expands and contracts the hydraulic cylinder unit 11. Pressure oil can be supplied to the cylinder unit 11 via the switching valve 12.

The upper end of the sensor rod 8 is connected to this oil passage switching valve 12 via a bell crank 12a and a connecting rod 12b, and the float 7 moves up and down with respect to the rice transplanter main body 1 (more precisely, the float is floating on the rice field). Therefore, the wheels move up and down,
When the wheels 5 are lowered, the floats 7 are in a relatively floating position) to switch the oil passage, and when the plow is deep, the piston rod 11 of the hydraulic cylinder unit 11
a is extended according to the depth, and the wheels 5 are lowered.

Piston rod 11 of this hydraulic cylinder unit 11
a has a flange 11 b, and this flange 11 b
The compression spring 13 whose one end is received by the piston rod 1
The compression spring 13 is strong enough not to be completely bent even when the piston rod 11a is fully extended, and the tip of the piston rod 11a has a Pin 11C is planted,
The center portion of the take-up lever 14, which extends in a direction perpendicular to the piston rod 11a, is pivoted by the pin 11C. The balance lever 14 is in a state where it can be moved along the axial direction.

The balance lever 14 has a U-shaped cross section consisting of a pair of horizontal tank plates and a vertical plate connecting one end of the tank plates, with the side opposite to the cylinder open and the vertical plate near both ends The plate is cut out to form a notch 14a.

Further, one end of a connecting rod 15 for forcibly rotating the swing arm 4 around the transmission shaft 3 is inserted into the notch 14a at both ends of the balance lever 14, and a connecting pin 15a is inserted.
It is pivotally connected to the balance lever 14 by the connecting rod 1.
The other end of the swing arm 5 is connected to a drive arm 16 protruding from the swing arm 4 by a connecting pin 15b.

The connecting rod 15 and the balance lever 14 are pivotally connected by a connecting pin 15a, so that they can rotate freely with respect to each other.
C and cannot be rotated beyond a certain angle.

Next, actual rice planting work using the walking rice transplanter according to the present invention will be explained.

When the left and right wheels are traveling on a roughly uneven tilling platform or on a flat tilling platform, the piston rod 11a of the hydraulic cylinder unit 11 expands and contracts according to the depth of the tilling platform. The wheels 5 are grounded on the tiller.

Furthermore, when the left and right wheels 5 are moved onto the plowing platform at different depths, it is necessary to lower only the deeper wheel by a greater amount, and in this case, the piston rod 11a is extended. Then, the shallower wheel touches the ground first, but since the deeper wheel has not reached the tiller, the piston rod 11a will extend until it touches the tiller.

In this case, since the shallower wheel 5 has touched the ground first, the expansion of the piston rod 11a does not lower it any further, and only the deeper wheel is lowered, causing the balance lever 14 to be lowered.
The perpendicular state between the piston rod 11a and the piston rod 11a is broken around the pin 11C of the piston rod 11a, as shown in FIG.

In this case, in FIG. 2, the wheels driven by the upper connecting rod 15 are in contact with the deep plowing platform.

Even at this time, the compression spring 13 has the effect of restoring the balance lever 14 to the position perpendicular to the piston rod 11a.

Therefore, if the left and right wheels move to the same height, the balance lever 14 will immediately move to the piston rod 11.
Restore to a state perpendicular to a.

Furthermore, the piston rod 11a and the balance lever 14 are
Since the pin 11C is fitted into the long hole 14a and is pivotally supported, unevenness of the tiller that does not hinder the planting of seedlings can be appropriately absorbed by the play between the pin 11C and the long hole 14a. .

In particular, when the difference in height between the left and right wheels is large, the lever 14 tilts and the connecting rod 15 hits the stopper 15C, as shown in
When this occurs, the wheel 5 does not go down any further and the vertical movement of the wheel is restricted, in other words, it is locked, but the compression spring 13 acts on the other wheel and has a cushioning function.

In addition, in the above explanation, the stopper 15C for the connecting rod 15 of the balance lever 14 was shown as using the edge of the notch 14a, but it is also possible to provide a pin on the connecting rod 15 so that this pin hits the lever. You can do it like this.

As explained above, according to the present invention, the balance lever, whose central part is supported by the piston rod of the hydraulic cylinder unit that is installed in the rice transplanter body and which automatically expands and contracts in response to the vertical movement of the float, moves from the equilibrium position to both sides. The stopper contacts the link member at a position rotated by a predetermined angle in the rotation direction,
Since further rotational movement is regulated, a large height difference does not occur between the left and right wheels, and therefore, the tilting of the aircraft body in the left-right direction can be reduced and the stability of the aircraft body can be maintained.

In addition, even in the locked state, the balance lever can move a predetermined amount in the axial direction of the piston rod while maintaining its rotational posture.
In addition, since it is elastically supported by compression springs, even if only one of the left and right wheels cannot touch the tiller in the field, the machine body can be elastically supported by the other wheel, causing no hindrance to planting work. Does not cause

In addition, the compression spring forces the balance lever to restore it to its equilibrium position, so as soon as there is no difference in height between the tillers on which the left and right wheels touch the ground, the machine will immediately be held horizontally. After that, the left and right wheels make the desired swing motion to adjust the planting depth, resulting in extremely good workability.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the walking rice transplanter according to the present invention, in which FIG. 1 is a side view of the walking rice transplanter, FIG. 2 is a plan view of the swing device, and FIG. 3 is a side view of the same. DESCRIPTION OF SYMBOLS 10... Swing device, 11... Hydraulic cylinder unit, 11a... Piston rod, 11 b... Flange, 11 C...
・Pin, 13... Compression spring, 14...
Balance lever, 14a... Long hole, 14b...
...Protrusion, 15...Connection rod, 15a...
...Connecting pin, 15C... Stopper.

Claims (1)

[Scope of utility model registration request] The left and right wheels of the rice transplanter body, which has a float that can move up and down, are supported via swing arms so that they can swing up and down independently of each other. In a walk-behind rice transplanter, the balance lever is connected via link members to both left and right ends of a balance lever, the center of which is supported by a piston rod of a hydraulic cylinder unit that automatically expands and contracts in accordance with the movement of the rice transplanter. It is freely pivoted by a predetermined amount in the axial direction of the piston rod, and a compression spring wrapped around the piston rod biases the wheel in the direction of downward movement. A stopper is provided that can come into contact with a link member that is pivotally supported by this, and the stopper is configured to come into contact with the link member at a position where the balance lever is rotated by a predetermined angle in both rotational directions from the equilibrium position. A swing device featuring: