JPH0753045B2 - Riding rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention connects a seedling planting device without a float to a traveling machine body so as to be able to move up and down, and detects a relative height of the seedling planting device with respect to a rice field. The present invention relates to a riding-type rice transplanter equipped with an ultrasonic sensor and an elevating control device for elevating and lowering the seedling planting device so as to maintain a set height above a rice field based on detection from the ultrasonic sensor.

[Conventional technology]

The current rice transplanter is a type of planting one row with one set of planting arms, but in recent years, in response to a request to improve the efficiency of planting work, two rows of planting arms are used to plant one row. Riding type rice transplanters of the type that have made it possible to increase the planting traveling speed have appeared.

As mentioned above, when the planting traveling speed becomes faster, the mud pushing phenomenon and ripple phenomenon due to the float that was provided for maintaining the posture of the seedling planting device become prominent, and there is a risk of adversely affecting existing seedlings. ing. In view of this, a riding type rice transplanter of the type that does not include the float has been proposed in such a riding type rice transplanter designed to increase the traveling speed with planting.

[Problems to be Solved by the Invention]

In the riding type rice transplanter, the raising and lowering control is performed to maintain the planting depth of the seedling constant by raising and lowering the seedling planting device with respect to the machine body based on the detection from the ultrasonic sensor. With the float-less configuration, the seedling planting device is supported only by the aircraft in a state of floating above the paddy field.Therefore, every time the seedling planting device is operated vertically by the lifting control, the seedling planting device is operated. The attached device tends to overshoot due to its weight and inertia, and tends to vibrate near the target position without stopping quickly at the target position.

Here, the present invention focuses on the above-mentioned problems, and an object thereof is to prevent the above-mentioned vibration phenomenon of the seedling planting device during the raising and lowering control operation.

[Means for Solving the Problems]

A feature of the present invention is that a seedling planting device without a float is vertically movable and connected to a traveling machine body, and a position detecting unit that detects a relative height of the seedling planting device with respect to a rice field, and a detection result from the position detecting unit. Based on the above, in the riding type rice transplanter equipped with a raising and lowering control device for raising and lowering the seedling planting device to maintain a set height from the rice field, it is extended obliquely downward toward the rear of the fuselage, and Above the board position, and further, in the seedling planting device is provided with a rod-shaped resistor arranged at a position corresponding to a height that rushes into the mud below the rice field,
The action and effect are as follows.

[Action]

When the resistor as described above is provided, when the seedling planting device is operated vertically or horizontally as the machine runs, the resistor also tries to vibrate in the same direction in the mud.
In this case, the resistance from the mud acts on the resistor in the mud, and the vibration phenomenon of the seedling planting device is suppressed. Further, since this resistor has a narrow rod shape, the phenomenon of mud pushing or the like is small even when the aircraft runs at high speed.

〔The invention's effect〕

As described above, by providing the rod-shaped resistor that has a damper-like function of absorbing vibration, it is possible to suppress vibration without accommodating phenomena such as mud pushing, and to speed up planting work. The riding type rice transplanter can now be smoothly moved up and down.

〔Example〕

Hereinafter, a riding type rice transplanter which is an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the planting Mission (1) a rear portion of the horizontal axis (P ₁₎ rotation driven planting case (2) is provided around both ends of the planting case (2) 2 A pair of planting arms (3) are provided, and a seedling stand (4) that is slidably driven in the left-right direction is provided on the upper part of the planting mission (1). As shown in FIG. The seedling planting device (A) is configured so that 3) alternately cut out the seedlings from the seedling stand (4) and plant them in the field. And
This seedling planting device (A) can be moved up and down to the traveling machine body through the four-link mechanism (5) and can be freely rolled around the front and rear axis (P ₂ ) at the rear end of the four-link mechanism (5). It is connected.

Two sets of ultrasonic sensors (6) for detecting the height from the rice field (S) to the seedling planting device (A) are provided at two places on the left and right of the lower surface of the planting mission (1). In contrast,
The four-link mechanism (5) is provided with a single-acting type lifting cylinder (7) for vertically moving the whole seedling planting device (A), and the upper part of the rear end of the four-link mechanism (5) and seedlings are placed. A double-acting rolling cylinder (8) is installed so as to extend over a fixed portion that supports the back surface of the table (4), and the rolling cylinder (8) is expanded and contracted to move the seedling planting device (A) to four. The rolling operation can be forcibly performed around the longitudinal axis (P ₂ ) of the link mechanism (5).

With the above-described configuration, the control device (not shown) is such that the seedling planting device (A) maintains the set height above the field (S) based on the detection from the two sets of ultrasonic sensors (6), and the field An operation signal is issued to a control valve (not shown) for both cylinders (7) and (8) so as to maintain the parallel state with respect to (S), and the two cylinders (7) and (8) are expanded and contracted. Of.

Rod-shaped resistors (9) swingably around the horizontal axis (P ₃ ) at the front of the planting mission (1) are provided at two locations on the left and right of the seedling planting device (A). The body (9) extends rearward and obliquely downward, and is arranged at a position corresponding to a height that plunges into the mud in a state where the body (9) is positioned above the cultivator position and below the paddy field. Then, a double-acting operation cylinder (10) is installed over the resistor (9) and the planting mission (1), and even if the control device performs the above-mentioned raising and lowering and rolling operations, The control device operates a control valve (not shown) with respect to the operating cylinder (10) so that the resistor (9) is thrust into the mud at a certain depth to change the angle of the resistor (9). It is operated.

Further, when the machine body is started from the stopped state to start the planting work, the resistor body (9) should be lowered to such an extent that it makes positive contact with the tiller (G) for a short time. Is also configured. This prevents the state where the front part of the machine body is lifted by the reverse torque at the time of starting.

[Another embodiment]

In the above-described embodiment, the angle of the resistor (9) is automatically changed, but as shown in FIG. 2, the resistor (9) is urged downward by the spring (11) and the set angle is changed. A structure provided with a stopper (12) for preventing the above-described downward swinging from coming into contact can also be adopted.

Further, as shown in FIG. 3, the worm (14) that engages with the worm gear (13) provided on the support shaft of the resistor (9) is rotated by the handle (15), and the angle of the resistor (9) is changed. It is possible to adopt a structure that artificially changes the.

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 THE DRAWINGS The drawings show an embodiment of a riding-type rice transplanter according to the present invention.
The figure is an overall side view of the seedling planting apparatus, and FIGS. 2 and 3 are side views showing another embodiment of the resistor. (6) ... Ultrasonic sensor, (9) ... Resistor, (A) ...
… Seedling planting device.

Claims (1)

[Claims] 1. A position detecting means (6) for connecting a seedling planting device (A) having no float to a traveling body so as to be able to move up and down, and detecting a relative height of the seedling planting device (A) with respect to a rice field. ,
A riding type rice transplanter comprising: a raising / lowering control device for raising / lowering the seedling planting device (A) so as to maintain a set height above a rice field based on a detection result from the position detecting means (6). , A rod-shaped resistor (9) extending obliquely downward toward the rear of the machine body and arranged at a position corresponding to a height above the cultivator position and below the paddy field into the mud. A riding-type rice transplanter installed in the seedling planting device (A).