JPS63160514A - Walking type paddy 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 is directed to an elevation control device that simultaneously controls the left and right wheels up and down using an elevation cylinder to maintain a constant height of the aircraft above the mud surface, and a lift control device for the left and right wheels. The present invention relates to a walking type paddy field working machine equipped with a rolling control device that maintains the machine body parallel to a mud surface by changing the relative height using a rolling cylinder.

[Prior Art] A walking rice transplanter is a typical walking rice paddy work machine. In this walk-behind rice transplanter, in order to plant seedlings at a constant depth, the height of the machine from the mud surface is maintained at a constant level. In addition to this, models have also been put into practical use that have a rolling control function that actively corrects the left and right tilt of the aircraft and keeps the aircraft parallel to the mud surface.

As an example of the configuration of the rolling control, there is a model in which a ground-contact rolling float that follows the mud surface is placed at the front of the aircraft, and the inclination of the aircraft with respect to this rolling float is detected to perform rolling control. It is.

[Problem that the invention seeks to solve]

In a walk-behind rice transplanter, after one planting process is completed, it turns at the edge of the ridge and moves on to the next planting process. Lift it up and make a turn with the aircraft in a forward descending position.

Therefore, if a rolling float is placed at the front of the aircraft,
Even when turning at the edge of a ridge, low and ring floats touch the mud surface and perform rolling control, which is preferable. However, if the rolling float has a wide contact distance between the left and right sides, the rolling float becomes a resistance to turning, and Since the rolling float may push mud and roughen the mud surface, the distance between the rolling floats and the ground cannot be set too large.

However, if a sufficient distance between the left and right sides of the rolling float cannot be maintained, the accuracy of detecting the inclination of the machine body during normal planting work will deteriorate, making it impossible to perform accurate rolling control.

The present invention has focused on the above-mentioned points, and aims to provide a configuration that allows accurate rolling control to be performed during normal planting work and allows for smooth turning.

[Means for solving problems]

A feature of the present invention is that, in a snow-covered walking type paddy field work machine, the center float moves up and down and rolls around the longitudinal axis to detect the height of the machine body relative to the mud surface and the horizontal inclination of the machine body. It is equipped with a pair of side floats that protrude forward from between the left and right wheels, and a pair of side floats that detect the left and right tilt of the aircraft on the rear and lateral outside of the left and right wheels.The functions and effects of these floats are as follows. It is.

[For production]

If configured as described above, the effective ground contact width of the left and right side floats will be larger than the effective ground contact width of the left and right center floats, so during normal planting work, elevation control is performed mainly based on the vertical movement of the center float. At the same time,
Rolling control is performed mainly based on detection of left and right side floats. Then, when turning at the edge of a ridge, by lifting the rear part of the aircraft slightly, the side floats behind the wheels are separated from the mud surface and only the part of the center float that protrudes ahead of the wheels is in contact with the ground. The front width of this center float is narrower than or approximately the same as the distance between the left and right wheels, so although the accuracy of tilt detection decreases, the maneuverability of turning does not deteriorate much, and rolling control is possible with little mud pushing phenomenon. It will be done.

〔Effect of the invention〕

As described above, by using a side float for rolling control and a center float for elevation control, and adding a rolling control function to the center float, rolling control can be performed when turning at the edge of a ridge. However, it was possible to improve the running performance of the walk-behind paddy field work machine without reducing the turning maneuverability and by reducing the occurrence of the mud-shoving phenomenon.

〔Example〕

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

As shown in Fig. 7, a transmission case (1) equipped with running wheels (2) at the end is swingably attached around the transverse axis (PI) to support the aircraft, and engine (
3), and a planting claw (4) and a seedling stand (5) at the rear of the aircraft.
), etc., and a control handle (6) constitute a walking rice transplanter.

To explain in detail the vertical movement structure of the wheel (2), the sixth
As shown in Figures 7 and 7, a balance arm (10) is pivotably supported around the vertical axis of the tip of a piston rod (9a) of a single-acting lifting cylinder (9) fixed to the aircraft body. ,
Both ends of this balance arm (10) and an operating arm (la) erected at the boss of the transmission case (1) are connected to the rod (11).
) and a rolling cylinder (12), and the left and right wheels (2) can be simultaneously moved up and down by expanding and contracting the lifting cylinder (9). and,
By extending and contracting the rolling cylinder (12), the balance arm (lO) is oscillated at the tip of the piston rod (9a), and the left and right wheels (2) are oscillated up and down in opposite directions. .

Next, we will explain in detail the center float (7) that detects the vertical movement and left/right tilt of the aircraft.As shown in Figure 1.2.5.6, the center float (7) is connected to the left and right wheels (2).
It is located between the left and right wheels (2) and protrudes forward from the left and right wheels (2), and can swing vertically around the transverse axis (P2) at the rear of the aircraft, and roll around the longitudinal axis (P3) of the aircraft. It can be installed freely.

As shown in FIG. 5, the front part of the center float (7) is connected to the lift control valve (2) via the link (24)
3) is interlocked and connected. The lift control valve (23) supplies hydraulic oil to the lift cylinder (9), and when the aircraft sinks into the mud surface and the center float (7) rises due to buoyancy, the lift cylinder (9) is operated. side'<'I
The ll valve (23) is operated to the pressure oil supply side, and the left and right wheels (
2) is operated to descend to correct the sinking of the aircraft. On the other hand, when the aircraft lifts up, the center float (
7) is lowered, the elevation control valve (23) is operated to drain oil, and the left and right wheels (2) are operated upward.

As shown in Figures 1 and 2, auxiliary floats (8) are provided on the left and right sides of the front of the center float (7).
The rolling movement of the center float (7) is carried out from an operating arm (13) provided on one of the auxiliary floats (8) to a rolling cylinder (12) via a bell crank (14), a linking rod (15), and a balance crank (16). ) to the rolling control valve (17). As a result, the rolling cylinder (12) is operated to expand and contract, and the left and right wheels (2) are operated to move up and down oppositely so that the aircraft body is parallel to the mud surface.

Side floats (18
a) , (18b) are vertically swingable around the horizontal axis (P2), and both side floats (18a),
(18b) are set to be sufficiently larger than the distance between the auxiliary floats (8) at the front of the fuselage.

Above the side floats (18a), (18b) are disposed crankshafts (19a), (19b) rotatably supported around a horizontal axis (P4), and the crankshafts (19a), (19b) and one end of the side float (18a).

(18b) The front portion is interlocked and connected via a linking rod (20).

There is a connecting rod (21) in the center of the fuselage that can be slid forward and backward.
is arranged, and one end of a linking rod (21) is connected to an arm (16a) extending from the balance crank (16). A rotatable balance crank (22) is attached to the other end of this linking rod (21).
The other ends of the crankshafts (19a) and (19b) are connected to both upper and lower ends of the balance crank (22).

With the above structure, when the aircraft tilts to the left and the left side float (18a) swings upward as shown in Fig. 3, the linking rod (20), the crankshaft (19a),
The linkage rod (
21) is pulled rearward to operate the rolling control valve (17) via the balance crank (16). As a result, the rolling cylinder (12) expands and contracts as before, and the left and right wheels (2
) is manipulated to move up and down. Also, the aircraft sank and the left and right side floats (18a) and (18b)
Even if they simultaneously swing upward, both crankshafts (19a) and (19b) operate in the direction of canceling each other's movements, as shown in Figure 4, and the linking rod (21) is not pushed or pulled. , the rolling control valve (17) is also not operated.

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 type paddy field work machine according to the present invention,
Figure 1 is a perspective view showing the linkage between the center float, side floats, and rolling control valve, Figure 2 is a front view of the front of the center float, and Figure 3 shows the balance crank and Fig. 4 is a side view showing the state of the linking rod; Fig. 4 is a side view showing the state of the balance crank and linking rod when the aircraft sinks; Fig. 5 is a side view showing the linkage between the center float and the elevation control valve; FIG. 6 is a plan view of the wheel lifting structure, center float, and side floats, and FIG. 7 is an overall side view of the walking rice transplanter. (2)...wheels, (7)...center float, (9)...lifting cylinder, (12)
...Rolling cylinder, (18a), (
18b)...Side float, (P3)...
...Anteroposterior axis.

Claims (1)

[Claims] An elevator control device that simultaneously operates the left and right wheels (2) up and down using an elevator cylinder (9) to maintain a constant height of the aircraft from the mud surface, and a rolling cylinder (12) that controls the relative height of the left and right wheels (2). This is a walk-behind paddy field work machine equipped with a rolling control device that keeps the machine parallel to the mud surface by changing the operation. A center float (7) is provided that protrudes forward from between the left and right wheels (2) to detect the height relative to the vehicle and the left and right inclination of the aircraft. A walking paddy field work machine equipped with a pair of side floats (18a) and (18b) that detect the inclination of the rice field.