JPH0427306A - Two wheel walking type transplanter - Google Patents

Abstract

PURPOSE:To improve the accuracy of the setting and maintaining of a seedling- planting depth by setting and maintaining the seedling-planting depth with a center float and covering the marks of wheels with side floats. CONSTITUTION:A center float 9 is disposed vertically shakably on a support point P2 and the position of the support point can be vertically changed with a changing means. Side floats 14a, 14b are also vertically shakably attached to support frames 19, 26. The wheels 3a, 3b are vertically driven in response to the vertical movement of the frame on the basis of the center float and the frame is maintained at a constant height from the surface of a field.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a two-wheeled walking rice transplanter.

[Conventional technology]

For two-wheeled walking rice transplanters, for example, Japanese Patent Application Laid-Open No. 55-960
As disclosed in Publication No. 09, a pair of left and right side floats ((7b) in the above publication) are installed behind a pair of left and right running wheels ((6a) and (6b) in the above publication).
There are some models in which a center float ((7a) in the above publication) is arranged at the front of the machine between the left and right wheels.

In the above-mentioned structure, the center float is attached to the rear end body so that it can swing up and down, and when the aircraft moves up and down with respect to the center float that follows the ground contact with the rice field, the left and right wheels are driven up and down based on this movement. The aircraft is maintained at the set height above the rice field. As a result, the planting depth of seedlings by the planting arm (corresponding to the planting mechanism in (31) of the above-mentioned publication) provided on the machine body is maintained constant. Also, the side floats behind the wheels are for erasing wheel marks.

When changing the planting depth of seedlings in the above configuration,
The vertical position of the side float relative to the aircraft has been changed. In other words, the aircraft is in a slightly upward position (shallow planting of seedlings).
The wheels can be driven up and down with the machine, or the wheels can be driven up and down with the aircraft in a backwards position (deep planting of seedlings).

In this way, the planting depth of seedlings is changed by the vertical position of the side float, because the front end of the side float and the planting arm are at approximately the same position. This is because it is directly related to the planting depth of seedlings.

[Problems to be Solved by the Invention] However, the side floats are located behind the wheels and also have the function of erasing the marks left by the wheels. In other words, since the side floats pass over the uneven rice field caused by the wheels, the side floats tend to move up and down and become unstable.

On the other hand, setting the planting depth of seedlings using side floats and maintaining the planting depth of seedlings by moving the wheels up and down allows the side floats to follow the ground on a smooth rice field with little vertical movement. This is a prerequisite and can only be done with precision. Therefore, if the vertical position of the side float is unstable as described above, the planting depth of seedlings cannot be set and maintained with high accuracy.

An object of the present invention is to improve the accuracy of setting and maintaining the planting depth of seedlings while retaining the function of erasing wheel marks using side floats.

[Means to solve the problem]

The feature of the present invention is that a two-wheeled walking rice transplanter is configured as follows. In other words, (a) A center float is placed between the left and right wheels at the front of the aircraft.

(■) A pair of left and right side floats are arranged behind the left and right wheels.

(c) The center float is attached to the body so that the rear end reaches the planting position by the planting mechanism and is swingable up and down around the fulcrum of the rear end of the center float.

(=) The rear part of the side float is attached to a support frame extending rearward from the rear part of the center float so that the side float can swing vertically.

(*) Elevation control means is provided for vertically driving the wheels so that the machine body maintains a set height from the rice field surface based on the vertical movement of the machine body with respect to the center float that follows ground contact with the rice field surface.

(f) A changing means is provided which can change the position of the fulcrum of the center float relative to the fuselage up and down.

In particular, its functions and effects are as follows.

[Function] (i) In the center float that detects the vertical movement of the aircraft with respect to the rice field, if the fulcrum of its vertical swing is changed up and down with respect to the aircraft, the center float's reference attitude (equivalent to the neutral position) with respect to the aircraft will be changed. ) changes, and the planting depth of seedlings can be changed.

(11) Since the center float slides on a relatively smooth field where wheels do not pass, its operation is relatively stable compared to side floats of conventional structure, and it accurately follows the ground on the field.

Therefore, by using this center float, the planting depth of seedlings can be maintained with high precision by vertical movement of the wheel.

(ij) Since the fulcrum of the center float whose position is changed vertically is located at approximately the same position as the planting mechanism, the amount of vertical change of this fulcrum is the amount of change in the planting depth of the seedlings, and the planting depth of the seedlings is The settings can be made with high precision.

(iv) Since the side floats are located behind the wheels as before, the side floats erase the marks left by the wheels.

In this case, the center float and side floats are connected by the support frame, so if you change the vertical position of the fulcrum of the center float as described above, the position of the side floats will also change vertically, and the wheel marks Erasing is done accurately.

(V) If the aircraft becomes lower than the center float, the center float will rise forward around the fulcrum, and the side floats will tend to fall. If the aircraft body becomes high relative to the center float, a situation opposite to that described above will occur.

In this case, the side floats swing up and down independently of the support frame and try to follow the ground on the rice field, so the side floats have no effect on the movement of the center float as described above as the aircraft moves up and down. do not have.

(vi) The side floats pass over the uneven rice field surface after the wheels pass, but since the side floats pass over the uneven rice field surface while swinging up and down independently of the support frame, there are no traces of the wheels. The movement of the side floats when erasing does not affect the center float.

〔Effect of the invention〕

As described above, by providing the center float with the function of setting and maintaining the planting depth of seedlings, and providing the side float with the function of erasing wheel marks, it is possible to set and maintain the planting depth of seedlings. Accuracy can be improved, and this makes it possible to prevent seedling growth failure due to planting deeper than the predetermined planting depth and seedling collapse due to shallow planting.

In addition, since wheel marks are erased using side floats, the advantage of the conventional structure of leveling the ground using side floats is not lost, and furthermore, leveling the ground using side floats does not affect the center float, making it possible to accurately level the ground using side floats. Now I can do it.

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

As shown in Figure 1, the transmission case for driving (1)
A pair of transmission cases (2) are located on the left and right sides of the horizontal axis (P,
), and this transmission case (2
) are provided with running wheels (3a) and (3b) at the ends thereof to support the body. Planting arm (4) at the rear of the aircraft
(corresponding to a planting mechanism), a seedling planting device consisting of a seedling stand (5), etc., a control handle (6), and a space between the mission case (1) and the planting arm (4). is equipped with a tank (7) and a feeding device (8) that feeds out the fertilizer in the tank (7).

A center float (9) is provided at the bottom of the fuselage, and a groove maker (1o) that makes a groove on a circular surface (G) is fixed to this center float (9), and a feeding device (8)
The fertilizer fed out from the hose (11) passes through the furrower (1).
It is fed into the groove made by 0). As described above, a two-wheel, two-row type walk-behind rice transplanter is constructed.

This walk-behind rice transplanter is equipped with a gasoline engine (12), and as shown in Fig. 1, a downward-sloping frame (13) is fixed to the front of the transmission case (1). A gasoline engine (12) is mounted on the vehicle, and the gasoline engine (12) is supported in a forward downward tilting position.

Next, the vertical movement structure of the left and right wheels (3a) and (3b) will be explained. As shown in FIGS. 1 and 4, a single-acting first hydraulic cylinder (
18) is connected to the rear end of this first hydraulic cylinder (18).
) is facing towards the rear of the aircraft. A support arm (20) is fixed to the tip of the piston rod (18a) of the first hydraulic cylinder (18).
) A pair of upper and lower balance arms (21
) is attached so that it can swing freely. This balance arm (21) is attached to the long holes (13a) on the left and right sides of the frame (13).
), and a pair of left and right ronds (22) are constructed and connected across both ends of the balance arm (21) and the arm (2a) at the base of the transmission case (2). With the above structure, when the first hydraulic cylinder (18) is expanded or contracted, the left and right transmission cases (2) and wheels (3a),
(3b) are operated to swing up and down in the same direction.

As shown in FIG. 4, it spans the support arm (20) and the bracket (23) fixed to the left rond (22).
A double-acting second hydraulic cylinder (24) is connected in construction. With this structure, for example, the second hydraulic cylinder (24)
When you extend the left transmission case (2) and wheel (3),
a) is operated to swing downward.

In conjunction with this operation, the balance arm (21) is swung counterclockwise in FIG. 4 via the rond (22), and the right transmission case (2) and wheels (3b) are swung upwards. be operated dynamically. In other words, the second hydraulic cylinder (24)
The left and right transmission cases (2) and wheels (
3a) and (3b), which are contradictory vertical swing operations, can be performed.

Next, center float (9) and side float
(14a) and (14b) will be explained. 1st,
As shown in Figure 23, the center float (9) is located between the left and right wheels (3a) and (3b) and at the bottom of the front side of the aircraft, and its rear end is located along the path (A) of the planting arm (4).
) is located slightly further forward of the aircraft.

The fixed frame (15) on the fuselage side is equipped with an operating lever (16) (corresponding to a changing means) that can be vertically swung around the horizontal axis (P). A lever guide (17) is fixed to the frame (15) which engages and holds it in position.

A support frame (19) extends from the rear end of the center float (9), and the support frame (19) extends from the rear end of the center float (9).
9) At the rear end (slightly to the rear of the aircraft from the planting trajectory (A) of the planting arm (4)), a support bracket (25) is attached so as to be able to swing freely around the longitudinal axis (P3), This support bracket (25) is swingably attached around the horizontal axis (p,) (corresponding to a fulcrum) of the operating lever (16). With the above structure, center float (9)
is supported so as to be able to swing vertically around the transverse axis (Pz) and roll freely around the longitudinal axis (P3) with respect to the fuselage.

In the side floats (14a) and (14b), as shown in Fig. 12.3, the support frame (19) has an arch-shaped support frame (26) that can swing freely around the front-rear axis (P6) at the upper rear end. is installed. Then, side floats (1
The rear parts of 4a) and (14b) are attached to be able to swing up and down around the horizontal axis (P,), and both side floats (14a) and (14b) are connected to the left and right wheels (3aL (
3b), both side floats (14a)
.

The tip of (14b) is set to be at the same position as the passage path (A) of the planting arm (4) in FIG.

Next, the first and second hydraulic cylinders (18), (24
) first and second control valves (28) for supplying and discharging hydraulic oil to
, (29) and the center float (9) will be explained. As shown in Figure 4.5.6,
The operating arm (
30) is fixed, and the operation part (28a) of the first control valve (28) on the upper part of the mission case (1) and the operation arm (30) connect the linkage iron (31) and the swing arm (32). are linked through.

Further, the operating portion (29a) of the second control valve (29) and the operating arm (30) are linked via a swinging bell crank (33) and a link (34).

With the above structure, when the aircraft moves up and down with respect to the center float (9) that follows ground contact on the field (G), the first control valve (28) is operated via the linkage rond (31) and the like. As a result, the hydraulic oil from the first control valve (28) is transferred to the first control valve (28).
The hydraulic cylinder (18) is supplied and discharged, and the aircraft moves to the rice field (
G) Left and right wheels (3a) so that the height is maintained at the set height, that is, the planting depth of the seedlings is maintained at the set value.
(3b) is operated to swing in the same direction.

When the aircraft body tilts to the left or right with respect to the center float (9), the second control valve (29) is operated via the bell crank (33) or the like. This allows the second control valve (29
) is supplied to and discharged from the second hydraulic cylinder (24), and the left and right wheels (3a) and (3b) swing oppositely so that the machine body is left and right parallel to the rice field (G). It is dynamically manipulated.

In the above configuration, as shown in Fig. 3, the operation lever (
16) around the horizontal axis (P,) to change the position of the horizontal axis (pz) at the rear end of the center float (9) up or down to change the planting depth of the seedlings. That's what I do.

In this case, at the same time as changing the planting depth of the seedlings, the vertical positions of the side floats (14a) and (14b) are also changed.

Then, in response to the operation of the center float (9) and the aircraft body such that the first and second control valves (28) and (29) are operated, the side floats (14a) and (14
b) independently rolls around the front and back axis (P,) and swings up and down around the horizontal axis (P,).

[Another embodiment] In the above embodiment, the side floats (14a), (1
The support frame (26) on the 4b) side was attached to be swingable around the longitudinal axis (P6) of the support frame (19) on the center float (9) side, as shown in Figures 7 and 8. The support frame (26) is connected and fixed to the support frame (19), and the center float (9) and both side floats (14a) and (14b) are aligned with the front and rear axis (P3).
It may also be constructed so that it rolls integrally around it.

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 two-wheeled walking rice transplanter according to the present invention,
Figure 1 is an overall side view of the two-wheeled walking rice transplanter, Figure 2 is a plan view showing the arrangement of the center float and side floats,
Figure 3 is a side view of the rear end of the center float, Figure 4 is a plan view of the vicinity of the first and second hydraulic cylinders, and Figure 5 is a linkage structure between the center float and the first and second control valves. A front view, FIG. 6 is a side view showing the interlocking structure of the center float and the first and second control valves, FIG. 7 is a plan view of the vicinity of the center float and side floats in another embodiment, and FIG. 8 is a different implementation. It is a side view of the rear end vicinity of the center float in an example. (3a), (3b)...wheels, (4)...
... Planting mechanism, (9) ... Center float, (14a), (14b) ... Side float, (16) ... Changing means, (19 ), (
26)...Support frame, (Pz)...
・Fully point, (G)...Tame.

Claims (1)

[Scope of Claims] A two-wheel walking rice transplanter equipped with a pair of left and right running wheels (3a) and (3b), the two-wheeled rice transplanter having the configurations described in (a) to (f) below. Walking rice transplanter. (a) At the front of the aircraft, the left and right wheels (3a), (3
A center float (9) is placed between (b) and (b). (b) A pair of left and right side floats (14a), (14b) are arranged behind the left and right wheels (3a), (3b). (c) The center float (9) is vertically swingable around the fulcrum (Pz) at the rear end of the center float (9) with its rear end reaching the planting position by the planting mechanism (4). Attach to the aircraft. (d) The rear portions of the side floats (14a), (14b) are attached to the support frames (19), (26) extending rearward from the rear portion of the center float (9). ) is attached so that it can freely swing up and down. (e) Based on the vertical movement of the aircraft with respect to the center float (9) that follows the ground contact on the surface (G), the aircraft moves to the surface (G).
) to maintain the set height from the wheel (3a), (
3b) is provided with an elevation control means for vertically driving it. (f) A changing means (16) is provided which can change the position of the fulcrum (Pz) of the center float (9) relative to the fuselage up and down.