JPH0432895Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to rice transplanters, rice transplanters with a fertilization device, etc., or walk-behind paddy field working machines such as fertilizer spreaders and direct sowing machines. In detail, the machine with the working equipment connected to it is equipped with a pair of left and right propulsion wheels that can be driven up and down, as well as a machine that follows the planting surface in advance of the propulsion wheels, and also that There are left and right rolling ground sensors that operate up and down based on changes in ground reaction force, and by the displacement of this rolling sensor based on changes in ground reaction force,
The present invention relates to a walking paddy field work machine having a rolling control mechanism that drives left and right propulsion wheels corresponding to left and right rolling sensors up and down in a direction opposite to the rolling sensor displacement direction.

[Conventional technology]

Conventionally, in this type of walking-type paddy field work machine,
A rolling ground sensor was always applied to the planting surface.

[Problem that the invention attempts to solve]

Therefore, if the grounding force of the rolling ground sensor against the planting surface is set to a constant value,
When the planting surface is hard, the rolling ground sensor senses local irregularities, causing the rolling control mechanism to operate frequently, which has the disadvantage that the parallel posture of the working device with respect to the planting surface cannot be stabilized. However, if you try to make the sensor's operation stable and insensitive on hard planting surfaces by increasing the ground biasing force, you will have the disadvantage that the sensor will not work sufficiently on soft planting surfaces. It's coming.

Therefore, the present invention was devised, and its purpose is to provide stable ground rolling control of the aircraft.

[Means for solving problems]

The characteristic configuration of the present invention includes a mud hardness detection mechanism that acts on the planting surface to detect its hardness and softness, and when the planting surface is hard, the rolling control operation is checked and prevented, and when the planting surface is soft, the mud hardness detection mechanism is installed. The mud hardness detection mechanism and the rolling sensor are provided with means for linking the mud hardness detection mechanism and the rolling sensor so as to perform a rolling control operation, and the effects thereof are as follows.

[Effect]

In other words, by using the movement of the mud hardness detection piece, which operates differently depending on the hardness of the planting surface, and by limiting the operation of the rolling sensor to only when the planting surface is soft, the sensitivity of the rolling sensor can be improved. Since the sensitivity can be specialized for soft cases, the sensitivity setting becomes easy and stable. Furthermore, the interlocking means can automatically switch between activation and deactivation of the rolling sensor.

However, if the planting surface is hard, the rolling control operation will be blocked, but rice transplanters are originally equipped with grounding floats, and the ground reaction force of this grounding float from the planting surface is used to prevent the rolling control from occurring. Because the surface is hard, it is large, and because the lifting control mechanism that uses these ground floats as ground sensors to maintain a constant posture with respect to the planting surface also operates, at least one of the propulsion wheels The two points, the point of contact with the tiller and the point of contact with the tiller, can prevent the aircraft as a whole from collapsing in parallel to the ground.

[Effect of idea]

As a result, rolling control can be made more stable than when the rolling sensor always acts on the planting surface.

〔Example〕

A walk-behind rice transplanter as a paddy field work machine will be explained in detail. As shown in Fig. 6, the walk-behind rice transplanter has a seedling planting mechanism 4 that is connected to the front part of the machine body by an engine 1 and a transmission case 2, and a transmission case 3 that also serves as the body flow. A machine body equipped with a seedling planting device 32 such as a stand 5 and a control handle 6 is supported by a pair of left and right propulsion wheels 7, 7, and a sensor float 31 located in the center of the machine body, so that it can travel on the field for planting. It is configured.

The control of raising and lowering the planting of seedlings will be explained in detail. As shown in FIG. 1, wheel transmission cases 8 that pivotally support a pair of left and right propulsion wheels 7 are supported on both sides of the transmission case 2 so as to be vertically swingable about the horizontal axis X. A hydraulic cylinder 9 that drives the wheel transmission case 8 to swing up and down and the wheel transmission case 8 are linked by a mechanical linkage mechanism 10. The mechanical linkage mechanism 10 includes a scale-type swinging arm 12 that is pivoted to the tip of a piston rod 11 of a hydraulic cylinder 9 so as to be horizontally swingable around a vertical axis Y, and an upright swing arm 12 that is fixed to the wheel transmission case 8. It consists of an arm 13 and a connecting rod 14 that connects the tips of the scale-type swinging arm 12 and the upright arm 13 to each other. With the above configuration, the propulsion wheels 7, 7 can be driven up and down with respect to the aircraft body by expanding and contracting the piston rod 11 of the hydraulic cylinder 9. On the other hand, for the hydraulic cylinder 9, a first hydraulic valve V ₁ controls the supplied hydraulic pressure.
The operating arm 15 of this hydraulic valve _V1 is connected to the front end of a sensor float 31 which is vertically swingable around a rear fulcrum Z by an operating rod 16.

Therefore, when the sensor float 31 swings up and down due to changes in ground pressure caused by unevenness of the tiller, the propulsion wheels 7, 7 are moved up and down in the opposite direction to the up and down swing of the sensor float 31. , the seedling planting mechanism 4 can always be maintained in a constant posture with respect to the planting surface. In the figure, reference numeral 17 denotes a spring that allows the propulsion wheels 7, 7 to move slightly up and down to follow the small irregularities of the tiller.

Next, the rolling control mechanism 34 of the aircraft body will be described in detail. As shown in FIGS. 1 and 2, left and right grounding parts 1 that act on the planting surface are provided at the tip of the body.
8A and 18B are integrally formed, the width center portion of the grounding rod type grounding sensor 33 is supported by the first holder 19 in a horizontal position so as to be able to swing up and down around the horizontal axis P, and this first holder 19 is integrally supported. A ground sensor 33 is pivotally supported to be able to swing up and down (rolling) around the axis Q of the second holder 20 together with the second holder 20 which is fixed and has a posture facing forward and backward. and,
The grounding portion 18 of this rolling grounding sensor 33
A and 18B are located on the forward extension line of the propulsion wheels 7 and 7, and when the ground reaction force changes, the ground contact portion 18
A and 18B swing up and down around the two axes P and Q so as to follow the planting surface, and only the up and down (rolling) rocking displacement around the axis Q is transmitted to the control valve V ₂ , which will be described later. It is designed to do so. That is, the U-shaped member 21 is erected on the second holder 20, and the bell crank 22 that engages with the U-shaped space of the U-shaped member 21 is provided, and the bell crank 22 and the rolling control valve _V2 are connected to each other. Operation arm 2
3 through the linkage mechanism 24, the ground sensor 33
The rolling vibration is transmitted to the rolling control valve _V2 . a second hydraulic cylinder _{2 for rolling control linked to the control valve V 2} ;
5 is installed between the scale-type swing arm 12 and a mounting bracket 26 fixed around the vertical axis Y of the scale-type swing arm 12 and capable of swinging relative to the scale-type swing arm 12. By swinging the scale-type swinging arm 12 around the vertical axis Y, the left and right propulsion wheels 7, 7 are operated in vertically opposite directions. Therefore, when the ground sensor 33 rolls due to a change in the ground reaction force at the left and right ground contact portions 18A, 18B, the left and right propulsion wheels 7, 7 are moved up and down in opposite directions depending on the amount of inclination. The rolling control mechanism 3 is configured to keep the planting posture of the seedling planting mechanism 4 constant by swinging it.
It consists of 4.

Next, the mud hardness detection mechanism 35 will be explained in detail.
As shown in FIGS. 1 and 5, the engine 1
A support frame 36 is extended forward from the mounting frame 1A, and this support frame 3
A grounding rod-type mud hardness detection mechanism 35 that can swing around the horizontal axis R is provided at the extending end of 6, and the soil hardness detection mechanism 35 is equipped with a grounding rod type mud hardness detection mechanism 35 that can swing around the horizontal axis R. The amount of swing of the detection mechanism 35 is changed. The mud hardness detection mechanism 35 and the rolling sensor 33 are linked by a tension spring type linking means 37 to detect the mud hardness when the planting surface is hard, as shown by the imaginary line in FIG. When the piece 35 swings rearward, the rolling sensor 33 is retracted above the planting surface and the rolling control operation is not performed. In the figure, reference numeral 38 denotes a stopper that, in cooperation with the tension spring serving as the linking means 37, restrains the rolling control operation of the rolling sensor 33.

[Another Embodiment] ○ _A As shown in FIG. rotary spool 27
The rotary spool 27 and the ground sensor 33 are connected so as to be able to operate as one unit. The pressure oil supplied to the second hydraulic cylinder 25 may be switched by vertically swinging the ground sensor 18 around the axis of the rotary spool 27.

○B The ground sensor 33 may be one that operates independently on the left and right sides, and the amount of deviation thereof may be extracted mechanically.
The second hydraulic cylinder 25 may be electrically taken out via the pinion 29 with a potentiometer 30, and the rolling control valve _V2 with motor M may be used to operate the second hydraulic cylinder 25. In this case, the operation of the mud hardness detection mechanism 35 is also controlled by a potentiometer, and if the planting surface is hard, the detection signal from the potentiometer 30 is cut off to prevent rolling control. You can.

○C The working device 32 may be a fertilizing device, a direct sowing device, or the like.

(d) The linking means 37 may be a combination of a tension spring and a wire mechanism, and is not limited to the one in the above embodiment.

(e) As the mud hardness detection mechanism 35, a plurality of grounding rods may be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking type paddy field work machine according to the present invention, in which FIG. 1 is a perspective view showing the rolling control mechanism, FIG. 2 is a front view showing the rolling control mechanism,
Fig. 3 is a front view showing another embodiment of the rolling control mechanism, Fig. 4 is a perspective view showing another embodiment of the rolling sensor, and Fig. 5 shows a linkage mechanism between the rolling sensor and the mud hardness detection piece mechanism. Side view, FIG. 6 is an overall side view. 7... Propulsion wheel, 32... Working device, 33...
Rolling ground sensor, 34...rolling control mechanism, 35...mud hardness detection mechanism, 37...cooperating means.

Claims (1)

[Scope of utility model registration request] The machine body to which the working device 32 is integrally connected is equipped with a pair of left and right propulsion wheels 7, 7 that can be driven up and down, and which also touch and follow the planting surface in advance of the propulsion wheels 7, 7. Left and right rolling ground sensors 33, 33 are provided which operate up and down based on changes in the ground reaction force from the rolling sensor 3.
Due to the displacement based on the change in ground reaction force of 3.33,
The left and right propulsion wheels 7, 7 corresponding to the left and right rolling sensors 33, 33, respectively, are connected to the rolling sensor 3.
3, 33 A walking paddy field working machine having a rolling control mechanism 34 that drives up and down in the opposite direction to the displacement direction, and a mud hardness detection mechanism 35 that acts on the planting surface to detect its hardness and softness. In addition, the mud hardness detection mechanism 35 and the rolling sensors 33, 33 are configured to check and prevent the rolling control operation when the planting surface is hard, and to perform the rolling control operation when the planting surface is soft. Means 37 for linking
A walk-behind paddy field work machine equipped with