JPS63160511A - 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 [Industrial Application Field] The present invention includes a rolling cylinder that changes the relative height of left and right wheels, and controls the rolling This invention relates to a walking paddy field working machine equipped with a rolling control mechanism that supplies and discharges pressurized oil to a cylinder and keeps the machine body parallel to a mud surface.

[Conventional technology]

A typical walking rice paddy work machine is a walking rice transplanter. 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 are equipped with a rolling control mechanism that actively corrects the left and right tilt of the aircraft and keeps the aircraft parallel to the mud surface.

An example of the rolling control mechanism is disclosed in Japanese Patent Application Laid-Open No. 61-2831.
This method is disclosed in Japanese Patent Publication No. 4 and Japanese Patent Application Laid-Open No. 15609/1983. In this configuration, ground sensors that can move up and down independently are arranged at the rear of both outer sides of the wheels that are driven to swing up and down, and connecting rods that transmit the up and down movement of the ground sensors are arranged from the outside of the wheels to the front of the wheels. The structure is linked to the rolling control valve in the section.

[Problem that the invention seeks to solve]

The left and right wheels extend rearward from near the center of the fuselage and are attached to a transmission case that is driven to swing by a rolling cylinder. With the above configuration, the linkage mechanism from the ground sensor must be configured to reach the rolling control valve while avoiding the swinging wheels and transmission case, and the linkage mechanism tends to become structurally complex. Additionally, since the linkage mechanism is largely exposed from the body, there is a risk that the linkage mechanism may come into contact with other objects and be damaged during work or movement.

, Here, the present invention focuses on the above-mentioned points and aims to make the linkage structure from the ground sensor to the rolling control valve as compact as possible.

[Means for Solving the Problems] The present invention is characterized in that, in a snow-covered walking type paddy field working machine, ground sensors that can move up and down independently are arranged at the rear of both outer sides of the left and right wheels, and the ground sensors A displacement difference detection mechanism that detects the vertical displacement difference of the left and right wheels is arranged behind the left and right wheels, and a linkage mechanism that mechanically interlocks and connects the rolling control valve and the displacement difference detection mechanism is arranged between both wheels to perform rolling control. It consists of a mechanism, and its functions and effects are as follows.

[For production]

As mentioned above, if the displacement difference detection mechanism is placed behind the left and right wheels, the linkage mechanism that transmits the vertical movement of the ground sensor to the displacement difference detection mechanism can be placed between the left and right wheels of the aircraft, regardless of problems such as interference with the transmission case and wheels. It becomes possible to arrange and configure substantially linearly in the direction. Furthermore, the linkage mechanism from the displacement difference detection mechanism to the rolling control valve can be arranged substantially linearly in the longitudinal direction of the aircraft, regardless of the rocking of the transmission case and wheels, and can be largely exposed from the aircraft. Nor.

〔Effect of the invention〕

As described above, there is no need to complicate the path of the linkage mechanism from the ground sensor to the rolling control valve, and the linkage mechanism can be made compact with a simple push-pull rod, etc., which reduces manufacturing costs. It was an advantageous structure.

Additionally, the linkage mechanism is also thicker (no longer exposed from the fuselage), making it possible to prevent unexpected damage.

〔Example〕

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

As shown in Fig. 7, a transmission case (1) with running wheels (2) at the end is attached to be swingable around the horizontal axis (Pl) 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 the balance arm (10) and the operating arm (1a) 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 (10) is operated to swing at the tip of the piston rod (9a), and the left and right wheels (2) are operated to move up and down in reverse.

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 move up and down around the transverse axis (P2) at the rear of the fuselage, and can freely roll around the longitudinal axis (P3) of the fuselage. installed on.

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 and discharges 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 control valve (23) starts lifting. Control valve (2
3) is substituted on the pressure oil supply side, and the left and right wheels (2) are lowered to correct the sinking of the aircraft. On the other hand, if the aircraft rises above the mud surface, center flow occurs.
(7) is lowered, the lift control valve (23) is operated to drain oil, and the left and right wheels (2) are operated to rise.

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.

There are ground sensors (1) on the left and right behind the left and right wheels (2).
The side floats (8a) and (18b) are vertically swingable around the horizontal axis (P2), and the distance between the side floats (18a) and (18b) is set to the auxiliary float (8) at the front of the fuselage. The spacing is set to be sufficiently larger than the spacing between the two. Said side flow 1 to (18a)
, (18b) Above are crankshafts (19a), (19b) rotatably supported around the horizontal axis (P4).
) is arranged, and this crankshaft (19a),
(19b) one end and 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 the upper and lower ends of the balance crank (22), and in this way the left and right side flows (18a)
, (18b) is arranged behind the wheel (2).

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 area of the center float, and Figure 3 is displacement difference detection when the aircraft is tilted to the left. A side view showing the state of the mechanism;
Fig. 4 is a side view showing the state of the displacement difference detection mechanism when the aircraft sinks, Fig. 5 is a side view showing the linkage between the sensor float and the elevation control valve, and Fig. 6 is the elevation structure and center of the wheel. Floor plan around the float and side float,
FIG. 7 is an overall side view of the walking rice transplanter. (2)...Wheel, (12)...Rolling cylinder, (17)...Rolling control valve, (18a), (18b)...Grounding Sensor, (21) town...coordination mechanism, (25)...displacement difference detection mechanism.

Claims (1)

[Claims] It is equipped with a rolling cylinder (12) that changes the relative height of the left and right wheels (2), and also supplies pressure oil to the rolling cylinder (12) via a rolling control valve (17) provided at the front of the aircraft. It is a walk-behind paddy field working machine equipped with a rolling control mechanism that performs drainage and keeps the machine parallel to the mud surface, and has ground sensors ( 18a), (18
b) and the ground sensor (18a);
(18b) A displacement difference detection mechanism for detecting the vertical displacement difference is arranged behind the left and right wheels (2), and the rolling control valve (18b) is arranged behind the left and right wheels (2).
17) and a displacement difference detection mechanism (25) are arranged between both wheels (2) to form a rolling control mechanism.