JPH0685644B2 - Rolling device for walking paddy work machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rolling device for a walk-type paddy work machine capable of allowing a working device to follow a paddy field even if there is a difference in depth between left and right sides of a tiller.

[Conventional technology]

As a rolling device for this type of walk-behind paddy work machine, conventionally, the left and right propulsion wheels are independently moved up and down by the vertical movement based on the ground pressure fluctuation of the left and right side floats,
There is a rolling device (Japanese Patent Laid-Open No. 60-251808).

[Problems to be solved by the invention]

In the case of the above conventional configuration, since the side grounding float is used as a sensor for controlling the rolling control, there is no problem during the straight-lined planting work, but there is a drawback that the rolling control cannot be sufficiently performed when turning in the headland. It was That is,
At the time of headland turning, since the operator lifts the steering handle located at the rear of the machine body upwards to rotate the machine body in the front-down posture and in the posture tilted toward the center of rotation,
The side grounding float was not in a normal grounding state, and rolling control could not be performed sufficiently.

An object of the present invention is to provide an apparatus capable of performing an appropriate rolling control even at the time of turning a headland and properly operating a device provided for that purpose.

[Means for solving problems]

The characteristic configuration according to the present invention is that the left and right side ground contact sensors are provided at the rear of the machine body so as to be able to move up and down independently of the traveling machine body, the control valve that controls the grounding posture of the working device is provided, The point that a first mechanical linkage mechanism that operates the control valve based on the relative lift deviation of the sensor is provided, the point that a center ground sensor that can lift and roll the aircraft is provided in front of the left and right side ground sensors, and the center ground A second mechanical linkage mechanism that operates the control valve in conjunction with the rolling operation of the sensor, and the second mechanical system that operates in conjunction with the rolling operation of the center ground sensor only when the center ground sensor is in the ascending position of the aircraft The point is to provide a flexible mechanism for operating the linkage mechanism, and the action and effect are as follows.

[Action]

Due to the characteristic configuration, the center ground contact sensor is located in front of the side ground contact sensor and maintains the ground contact state even when the traveling machine body is in the forward tilted posture when turning on the headland. The change can be detected by the ground contact sensor, and the rolling operation of the traveling machine body can be performed.

(B) According to the characteristic configuration, when the center grounding sensor is in the rolling position with the center grounding sensor in the up position for the body due to the operation of the accommodation mechanism, the second mechanical linkage mechanism is activated to perform the rolling operation of the traveling body, and the up position for the body Even if the rolling operation is performed in the state that is not present, the second mechanical linkage mechanism does not operate and the traveling machine body does not perform the rolling operation. Therefore, at the time of headland turning when the operator lifts the steering handle to switch the aircraft to the forward-downward tilting posture, the center grounding sensor switches relatively to the aircraft upright position due to the forward-downwardly tilting posture of the aircraft, and the side ground sensor sensor Even if it ’s not working
The rolling operation of the traveling body can be performed.

〔The invention's effect〕

Due to the action b, the rolling machine can be rolled even when the headland turns, and the operator lifts the steering wheel to an unstable posture, and the posture of the traveling machine changes due to the change in the depth of the tiller. It is possible to suppress the influence of the change in the depth of the cultivator by the rolling operation at the point where is added, and it is possible to reduce the aggravation of the burden on the operator during turning work.

From the action b, by providing a flexible mechanism, the operation of the center ground sensor can be transmitted to the control valve only when turning the headland, and only the side ground sensor with high rolling sensitivity installed at left and right intervals when traveling straight with planting. Since rolling control can be performed with, both ground sensors can be used properly according to the work situation. Further, the side grounding sensor and the center grounding sensor are in a linked state through the first and second mechanical linking mechanisms, and similarly when the side grounding sensor does rolling operation, the center grounding sensor does not work. The point where the sensor becomes the resistance of the side grounded sensor can be cut off by the accommodation mechanism, and the operation of the side grounded sensor can be performed as desired without restriction.

〔Example〕

A rolling type rice transplanter as an example of a paddy working machine will be described as an example of a rolling device.

As shown in FIG. 7, a transmission case (1) having wheels (2) for traveling at its ends is swingably mounted around the horizontal axis (P ₁ ) to support the machine body, and at the same time, in front of the machine body. Walk with an engine (3) in the rear part and a planting device (29) as a working device composed of a planting claw (4) and a seedling stand (5) and a control handle (6) in the rear part of the machine body. It constitutes a type rice transplanter.

The vertical movement structure of the wheel (2) will be described in detail below.
As shown in FIG. 7 and FIG. 7, the balance arm (10) is swingably supported around the vertical axis at the tip of the piston rod (9a) of the single-acting lift cylinder (9) fixed to the machine body. , Both ends of the balance arm (10) and the transmission case (1), (1)
The operation arms (1a), (1a) provided upright on the boss portion of the are connected via a rod (11) and a rolling cylinder (12), and the left and right wheels ( 2) is simultaneously moved up and down. Then, the balance arm (10) is oscillated by the tip of the piston rod (9a) by the expansion and contraction operation of the rolling cylinder (12), and the left and right wheels (2) are operated by the anti-reverse vertical movement.

Next, the center float (7) as a center ground contact sensor for detecting the vertical movement and the lateral tilt of the machine body will be described in detail. As shown in FIGS. 1, 2, and 5, the center float (7) is the left and right wheels (2). It is arranged between the left and right wheels (2) so as to project forward, and can swing up and down around the horizontal axis (P ₂ ) at the rear of the machine body, around the front and rear axis (P ₃ ) of the machine body. It is mounted so that it can be rolled freely.

As shown in FIG. 5, the front part of the center float (7) is connected to the lift control valve (23) via the link (24).
It is linked with. The lift control valve (23) supplies and discharges hydraulic oil to and from the lift cylinder (9). When the body sinks into the mud surface and the center float (7) is lifted by buoyancy, the lift control valve (23) moves up and down. The control valve (23) is operated to the pressure oil supply side, and the left and right wheels (2) are operated to be lowered to correct the sinking of the airframe. On the other hand, when the airframe floats above the mud surface, the center float (7) descends, the lift control valve (23) is operated to the oil drain side, and the left and right wheels (2) are operated to rise.

As shown in FIGS. 1 and 2, auxiliary floats (8) are provided on the left and right of the front part of the center float (7),
The rolling operation of the center float (7) is performed by operating the operation arm (13) provided on one auxiliary float (8) to the bell crank (14), the connecting rod (15), and the balance crank (1).
It is transmitted to the rolling control valve (17) for the rolling cylinder (12) via 6). As a result, the rolling cylinder (12) is expanded and contracted, and the left and right wheels (2) are operated so that the machine body is parallel to the mud surface. Above, operation arm (13), bell crank (1
4), link rod (15), balance crank (16), etc.
It is called a mechanical linkage mechanism (B).

Side floats (18a) and (18b) as side ground contact sensors on the left and right behind the left and right wheels (2) can swing up and down around the horizontal axis (P ₂ ) and both side floats (18a). , (18b) are set to be sufficiently larger than the auxiliary float (8) on the front of the fuselage. Above the side floats (18a), (18b),
Crank shaft (19) rotatably supported around the shaft center (P ₄ ).
A) and (19B) are arranged and this crankshaft (19B)
A), one end of (19B) and side float (18a), (18b)
The front part is interlockingly connected via a vertically oriented connecting rod (20).

A longitudinally extending linkage rod (21) is arranged in the center of the machine body so as to be slidable in the longitudinal direction, and one end of the linkage rod (21) is connected to an arm (16a) extended from the balance crank (16). ing. A rotatable arm (22) is attached to the other end of the linking rod (21), and the other ends of the crankshafts (19A) and (19B) have different cranking directions by 180 ° from each other. , (19b) are attached, and the arms (22) are connected to both ends of the crank arms (19a), (19b) with a long hole for flexibility.

The tilt detection by the side floats (18a) and (18b) is performed as follows. That is, when the airframe leans to one side and one side float is displaced upward, the displacement of the side float (18a) is linked to the crankshaft (19A) linked to the side float (18a) as shown in FIGS. 1 and 3. ) And a crank arm (19a), the arm (22) rotates around a connection point with the other crank arm (19b). When the arm (22) thus operates, the linkage rod (21) is pulled to rotate the balance crank (16) to operate the rolling control valve (17). The displacement of the connecting point of the arm (22) to the link rod (21) represents the relative vertical deviation between the left and right side floats (18a), (18b).

Also, the aircraft sinks and the left and right side floats (18a),
When (18b) is displaced upward, both crankshafts (19A) and (19B) rotate in the same direction as shown in FIG. 4, but the crank arms (19a) and (19b) protrude. Since the directions are opposite to each other, the arm (22) rotates around the axis (P ₄ ), and the center of the arm (22) is not displaced from the axis (P ₄ ). Of. that's all,
Crankshaft (19A), (19B), crank arm (19
a), (19b), arm (22), link rod (21) first
It is called a mechanical linkage mechanism (A).

Next, the accommodation mechanism (2) in the second mechanical linkage mechanism (B)
5) will be described in detail. 1 and 2 (a),
As shown in (b), the operation arm (13) erected from the auxiliary float (8) has an inverted triangular hole (26) when viewed from the front.
Is a plate-shaped bracket in which an engaging pin (27) projecting forward from the bell crank (14) is inserted and engaged in the hole (26). As shown in FIG. 2 (a), when the center float (7) reaches the airframe raising position, the engagement pin (27) moves to the narrow portion (26a) at the lower end of the hole (26), Then, when the center float (7) performs the rolling operation, the tendency pin (27) is oscillated and the second mechanical linkage mechanism (B) is operated. On the contrary, when the center float (7) descends to the body, as shown in FIG. 2 (b), the engagement pin (27) has the punching hole (26) and the wide portion (26b) at the upper end.
At this point, even if the center float (7) rolls, the engagement pin (27) is not rocked, and the second mechanical linkage mechanism (B) does not work. Operation arm (1
The hole (26) formed in 3) is referred to as the interchange mechanism (25).

[Another embodiment]

The embodiment described above may be applied to other paddy working machines such as fertilizer application and sowing machines.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a rolling device for a walk-behind paddy work machine according to the present invention. Fig. 1 is a perspective view showing the linkage between a side grounding sensor and a center grounding sensor, and Fig. 2 (a) shows a center grounding sensor. 2 is a front view showing the rolling operation when the aircraft is lifted, FIG. 2 (b) is a front view showing the rolling operation when the center ground contact sensor is lowered, and FIG. 3 is one side ground contact sensor that moves up and down. FIG. 4 is a side view showing the operation of the arm when it operates, FIG. 4 is a side view showing the operation of the arm when both side ground sensors are moved up and down in the same direction, and FIG. 5 is a lift control mechanism by the center ground sensor. FIG. 6 is a side view showing the walking type rice transplanter, and FIG. 7 is a side view showing the walking type rice transplanter. (7) …… Center ground sensor, (17) …… Control valve,
(18a), (18b) …… Side grounding sensor, (25) …… Interchange mechanism, (29) …… Working device, (A) …… First mechanical linkage mechanism, (B) …… Second mechanical type Coordination mechanism.

Claims (1)

[Claims] 1. Left and right side ground sensors (18
a) and (18b) are provided so as to be able to move up and down independently of the traveling machine body, and a control valve (17) for controlling the grounding posture of the working device (29) is provided, and the side ground contact sensor (18a), The first mechanical linkage mechanism (A) for operating the control valve (17) based on the relative lift deviation of (18b) is provided, and the aircraft is lifted up and down in the middle between the left and right side ground contact sensors (18a), (18b). -A center grounding sensor (7) capable of rolling operation is provided, and the control valve (1) is linked to the rolling operation of the center grounding sensor (7).
The second mechanical linkage mechanism (B) for operating 7) is provided, and the second machine is linked to the rolling operation of the center ground sensor (7) only when the center ground sensor (7) is in the ascending position with respect to the machine body. A rolling device for a walk-behind work machine provided with a flexible mechanism (25) for actuating the automatic linkage mechanism (B).