JPH01132309A - Walking paddy field working machine - Google Patents

Abstract

PURPOSE:To stabilize the action of float by rolling control, by providing a 1st interlocking mechanism to interlock the relative vertical deviation of a side float with a control valve and a 2nd interlocking mechanism interlocking with the rolling of a center float. CONSTITUTION:The titled machine is provided with a control valve 17 to control the rolling posture of a working apparatus based on ground and with a 1st mechanical interlocking mechanism A to operate the control valve 17 based on the relative vertical deviation of side floats 18a, 18b. A center float 7 capable of being vertically shifted or rolled against the machine is placed in front of the middle part of the right and the left side floats 18a, 18b. The control valve 17 is operated by a 2nd mechanical interlocking mechanism B interlocked with the rolling action of the center float 7. The action of the float in the rolling control can be stabilized by the above construction and, accordingly, the hunting phenomenon caused by the frequent operation of the control valve can be suppressed and the nonuniform posture of the planted seedlings can be avoided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention raises and lowers the left and right propulsion wheels with relative height changes based on the left and right rolling action caused by changes in ground pressure due to changes in the plowing depth of the ground float. The present invention relates to a walking type paddy field working machine which is equipped with a rolling control means for maintaining a constant ground posture of the traveling machine body and thus the working device.

[Conventional technology]

Conventionally, this type of walking-type paddy field work machine has a center float located between the propulsion wheels as a ground float, and auxiliary floats that extend left and right in front of the propulsion wheels are integrally connected to the center float. A center float with a large ground contact width on the front end side was installed, which allows for good rolling operation not only when traveling straight for planting but also when turning around the ridge with the traveling body tilted forward (for example, Publication No. 61-34830).

[Problem that the invention seeks to solve]

Indeed, as mentioned above, if the width of ground contact is larger towards the front end, the forward tilted posture of the traveling aircraft will make it easier for the front end to touch the ground when turning on the edge of a ridge, allowing for good rolling operation. When traveling, the traveling aircraft tends to lean backwards due to the reverse torque of the propulsion wheels, and as a result, the center float sinks slightly on the rear end side to increase ground pressure and tilt the aircraft backwards. Uke takes a stopping position, and conversely takes a floating position that slightly weakens the ground pressure on the front end side.

Therefore, the front end side where the ground contact surface spreads laterally is more likely to perform a rolling operation, and the sensor tends to be too sensitive as a rolling ground sensor because it is more likely to operate against even slight irregularities on the planting surface.

An object of the present invention is to provide a vehicle that can perform appropriate rolling control even when traveling straight ahead with planting by installing a new ground sensor.

[Means for solving problems]

The characteristics of the present invention are as follows: (1) left and right side floats are provided at the rear of the machine so that they can be raised and lowered independently with respect to the traveling machine; (2) a control valve is provided to control the rolling attitude of the working device relative to the ground; (2) the above-mentioned A first mechanical linkage mechanism is provided to operate the control valve based on the relative elevation deviation of the side floats, ■ A center float is provided intermediately forward of the left and right side floats and is capable of lifting and lowering the aircraft and rolling. A second mechanical linkage mechanism is provided to operate the control valve in conjunction with the rolling operation of the center float, and (1) left and right side floats are respectively disposed behind the left and right propulsion wheels on their movement trajectories. , and its functions and effects are as follows.

[For production]

According to feature configuration ■, when a level difference occurs between the left and right running plowing platforms of the left and right running wheels and the running machine tilts left and right, a relative elevation deviation occurs in the left and right side floats, and the control valve is operated, and in response, The left and right propulsion wheels are raised and lowered so that a vertical deviation opposite to that of the side floats occurs, and the attitude of the traveling machine body, that is, the attitude of the working device is maintained constant relative to the ground.

In other words, from characteristic configurations ① and ②, by arranging the left and right side floats behind the running wheels, rolling control is performed using the side floats with high ground pressure in order to support the running aircraft tilting backwards due to the reverse torque of the propulsion wheels. It is possible to install a float that will not malfunction even if the planting surface is somewhat uneven, and the center float and side float are mechanically linked via a control valve as shown in feature configuration ■ and ■. Since the side floats exert a pushing force against the rolling operation of the center float due to local unevenness and act as resistance, the center float does not malfunction even if there are some unevenness.

Moreover, when turning on the ridge, the posture of the working device can be maintained constant by the rolling operation of the center float.

In addition, as shown in characteristic configuration (■), the left and right side floats are located on the movement locus of the left and right propulsion wheels, so even if there are large clods of soil, they can be swept over small uneven ground by their own weight after being crushed by the propulsion wheels. Since it performs more stable lifting and lowering operations during break-in, it has become possible to provide a more stable sensor.

〔Effect of the invention〕

As a result, the operation of the float involved in rolling control becomes stable, the hunting phenomenon caused by frequent operation of the control valve can be suppressed, and irregular planting postures of seedlings can be avoided.

〔Example〕

The rolling device will be explained using a traveling rice transplanter as an example of a paddy field working machine.

As shown in Fig. 5, a transmission case (1) equipped 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 seedling planting device (29) as a working device consisting of a planting transmission case (23), a planting claw (4), a seedling stand (5), etc., and a control handle (6) at the rear of the aircraft. ), and a fertilizing device (28) is provided in the middle of the machine body to constitute a walking type paddy field working machine.

To explain in detail the vertical movement structure of the wheel (2), the fourth
As shown in the figure and Fig. 5, a balance arm (10) is pivotably supported around a vertical axis at 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 the transmission case (1)
, Operation arm (la) installed on the boss part of (1)
, (la) are connected via a rondo (11) and a rolling cylinder (12), and a lifting cylinder (9
), the left and right wheels (2) are simultaneously moved up and down.

Then, the balance arm (10) is operated to swing at the tip of the piston rond (9a) by the expansion and contraction operation of the rolling cylinder (12), and the left and right wheels (2) are operated to move vertically in opposite directions.

Next, center float (7) and side float (1
The mounting structure of 8a) and (18b) will be explained. The center float (7) is installed between the left and right propulsion wheels (2), (2) and on the front side, and the rear end of the connecting rod (27) protruding rearward from the rear end is a cross-swing type. The rear bracket (26) is configured to be able to swing up and down around the horizontal axis (P2), and to be able to roll left and right around the front and back axis (P3) of the rear bracket (26). An elevating rond (25) is abutted and supported on the upper surface of this center float (7), and
The upper end of this lifting rod (25) is the lifting cylinder (9).
It is linked to the lift control valve (30) provided at the rear end, and the lift rond (25) is moved up and down by the up and down movement of the center float (7) in response to ground pressure fluctuations, and the left and right wheels (2), (2) is raised and lowered by the same amount in the opposite direction to the raising and lowering direction of the center float (7), thereby operating the raising and lowering control to maintain the center float (7) constant.

As shown in Figures 1 and 5, auxiliary floats (8) are provided on the left and right sides of the front of the center float (7).
The rolling motion of the center float (7) is carried out from the operating arm (13) provided on one of the auxiliary floats (8) to the rolling cylinder (12) via the bell crank (14), linkage rondo (15), and 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. The operating arm (13), bell crank (14), linkage iron (15), balance crank (16), etc. are referred to as the second mechanical linkage mechanism (B).

Left and right side floats (18a) and (18b) are positioned behind the left and right wheels (2) on their movement trajectory, and the rear end bracket (24) is suspended from the rond (
31) to the planting transmission case (23), and is pivotally supported to be vertically swingable about the horizontal axis (Q) of this bracket (24).

Above the side floats (18a) and (18b), crankshafts (19A) and (19B) supported rotatably around an axis (P4) are disposed, and the crankshaft (198) , (19B) and the front portions of the side floats (18a), (18b) are interlocked and connected via a vertical rond (20).

In the center of the fuselage, there is a connecting port and throat (21
) is arranged, and one end of a connecting port/nod (21) is connected to an arm (16a) extending from the balance crank (16). A rotatable arm (22) is attached to the other end of the connecting port/nod (21), and a crank arm whose protruding direction is different by 180 degrees is attached to the other end of the crankshaft (19^), (19B). (19a),
(19b) is attached, and the arm (22) is connected to both ends of the crank arms (19a) and (19b) with flexibility due to their length.

Inclination detection using the side floats (18a) and (18b) is performed as follows. In other words, when the aircraft is tilted to one side and one side float is displaced upward, the displacement of the side float (18a) is caused by the crankshaft (19A) linked to the side float (18a), as shown in FIG.
and is transmitted via the crank arm (19a), and the arm (22) rotates around the connection point with the other crank arm (19b). When the arm (22) operates in this way, the connecting port/nod (21) is pulled and the balance crank (16) is rotated to open the rolling control valve (17).
Activate. (18
a) represents the relative vertical deviation of (18b).

Also, the aircraft sank and the left and right side floats (18a)
, (18b) are displaced upward, both crankshafts (19A) and (19B) rotate in the same direction as shown in Fig. 3, but the crank arm (19a)
, Since the protruding direction of (19b) is in the opposite direction, the arm (22) will rotate around the axis (P4), and the center of the arm (22) will be displaced from the axis (P4). There is nothing to do. Above, the crankshaft (1
9A), (19B), crank arm (19a).

(19b), the arm (22), and the linkage rond (21) are referred to as a first mechanical linkage mechanism (^).

The bell crank (1) is attached to the operating arm (13).
4) A long hole (13A) that holds and holds the side engagement pin (14a).
) are formed, and the upper and lower ends (13a) of this long hole (13A)
.

(13b) is opened to have approximately the same diameter as the engagement pin (14a),
The upper and lower middle width is larger than the diameter of the engagement pin (14a). Therefore, when driving straight ahead for planting, the retaining pin (14
a) is located at the upper and lower middle part of the elongated hole (13A) to prevent the rolling operation of the center float (7) from being transmitted to the rolling control valve (17), and to prevent the center float (7) from moving at the edge of a ridge, etc. When rising relative to the traveling body, the engagement pin (14a) engages with the lower end (13b) of the elongated hole (13A), and the rolling operation of the center float (7) is activated by the rolling control valve.

Furthermore, when driving on the road, the center float (7) hangs freely and the retaining pin (17) is transmitted to the center float (7).
4a) engages with the upper end (13a) of the elongated hole (13A),
The elongated hole (13A
) The shape is formed.

[Another example]

■ 1st. Wires or the like may be used as the second mechanical linkage mechanisms (A) and (B), and are not limited to those of the above embodiments.

(2) The above embodiment may be applied to a walking rice paddy working machine such as a walking rice transplanter or a dedicated fertilization machine.

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,
FIG. 1 is a perspective view showing the first mechanical linkage mechanism and the second mechanical linkage mechanism, and FIG. 2 is a side view showing the operating state of the arm when the left and right side floats move up and down with a relative deviation. Figure 3 is a side view showing the operating state of the arm when the left and right side floats move up and down by the same amount in the same direction;
FIG. 4 is an overall plan view, and FIG. 5 is an overall side view. (2) Propulsion wheel, (7) Center float, (17) Control valve, (18
a) , (18b)...Side float, (
29)... Working device, (A)... First
Mechanical linkage mechanism, (B)...Second mechanical linkage mechanism.

Claims (1)

[Claims] Left and right side floats (18a), (18b) at the rear of the aircraft
is provided so as to be able to be raised and lowered independently with respect to the traveling machine body, and is also provided with a control valve (17) that controls the rolling attitude of the work device (29) against the ground to a constant level, so that the relative position of the side floats (18a) and (18b) is A first mechanical linkage mechanism (A) is provided to operate the control valve (17) based on the elevation deviation, and a center float (A) capable of lifting and lowering the aircraft and rolling is provided at the intermediate front of the left and right side floats (18a) and (18b). 7) and this center float (7).
) in conjunction with the rolling operation of the control valve (17).
A second mechanical linkage mechanism (B) is provided for operating the left and right propulsion wheels (2), and left and right side floats (18a) and (18b) are respectively arranged on the movement trajectory behind the left and right propulsion wheels (2) and (2). A walking type paddy field work machine.