JPH0445456Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a device that automatically controls the height of a seedling planting device in a rice transplanter with respect to the field surface so that it remains approximately constant through the movement of a float. It is.

[Conventional technology]

When automatically controlling the height of the seedling planting device relative to the field surface during rice transplantation to a substantially constant level by vertical movement of a float that is in contact with the field surface, performing this automatic control for each of multiple floats is a single process. At a float point, the seedling device may be lowered by the movement of another float even though the height relative to the field surface is low, or even though the height relative to the field surface is high at one float point. However, in view of the fact that the movement of another float causes problems such as raising the seedling planting device, Japanese Patent Application Laid-Open No. 59-59107 as a prior art proposes that the movement of one of the floats When the floats rise, the seedling planting device is raised, and when all the floats move down together, the seedling planting device is lowered relative to the field. We are proposing to link them together.

[Problem that the invention attempts to solve]

By the way, when leveling unevenness in a rice field field prior to seedling planting work, a float in a rice transplanter is pressed against the field surface while the machine moves.

In this case, in order to forcibly even out the unevenness of the field, it is preferable that the plurality of floats move up and down simultaneously with respect to the field.

However, in a rice transplanter as in the prior art, in which the seedling planting device is automatically controlled to rise due to the upward movement of one of a plurality of floats, the sensor that detects the vertical movement of the float in the automatic control is Even if the sensitivity is reduced, the seedling planting device will rise due to the movement of a single float riding on a convex part of the field, so it will not be possible to press the convex part greatly, and the height of the convex part will be used as a reference. There was a problem that the leveling workmanship deteriorated.

The present invention also aims to solve the above-mentioned problem by making it possible to switch the control state of the lift control device in a rice transplanter between normal seedling planting work and leveling work. be.

[Means to solve the problem]

For this reason, the present invention includes a seedling planting device equipped with at least two or more floats that can be moved up and down, a hydraulic cylinder for moving the seedling planting device up and down with respect to the field, and a seedling planting device that uses the hydraulic cylinder to move the seedling planting device up and down. In the rice transplanter, the plurality of floats are provided with a sensor that detects the vertical movement of each float, and the control valve is controlled to switch the switching valve based on a signal from each sensor. The means includes a state in which the seedling planting device is raised by raising at least one float during normal seedling planting work, and a state in which the seedling planting device is raised only by raising the plurality of floats during field leveling work. The structure includes a switching means for selectively switching between a state in which the transplantation device is raised and a state in which the transplantation device is raised.

[Functions and effects of the idea]

With this configuration, during normal seedling planting work, the switching means changes the signal from the sensor that detects the rise of one float among the sensors that detect the vertical movement of each of the plurality of floats. The height of the seedling planting device relative to the field surface can be stably controlled because the seedling planting device can be raised. If the float does not rise, it is possible to prevent the seedling planting device from rising, so even if there is a convex part in the field, it will not be affected by the raised part, and other Since the float is pressed toward the field, the field can be leveled well during leveling work.

Therefore, according to the present invention, the height of the float in the seedling planting device can be controlled by simply selectively switching the control means between seedling planting work and leveling work using the switching means. It has an effect that can be used for so-called plowing work to level the field.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a riding rice transplanter will be explained with reference to the drawings. A seedling planting device 5, which will be described in detail later, is removably attached to the tip of a vertically moving link mechanism 4 extending rearward from the rear of the traveling device 1 via a hitch mechanism 6. This seedling planting device 5 is configured to be moved up and down by a hydraulic cylinder 7 installed between the traveling body 1 and the link mechanism 4, and the hydraulic cylinder 7 for lifting and lowering is provided on the side of the seedling planting device 5. An electromagnetic solenoid switching valve 8 is configured to switch between raising and lowering the seedling planting device 5.

The seedling planting device 5 includes a planting case 10, a vertically swinging seedling planting mechanism 11 attached to both left and right sides of the planting case 10, and a float 12 located at the bottom of the planting case 10. Four seedling planting units 14 each consisting of a seedling stand 13 that is supported on the upper surface of the planting case 10 in a horizontally movable manner are arranged in parallel, and a pipe member 1 is connected between the planting cases 10 in each of the seedling planting units 14.
It consists of 5 connected units, each seedling planting unit 1
4, the rear end of each float 12 is attached to the tip of an arm 17 that extends rearward from a planting depth adjustment shaft 16 horizontally supported on the lower surface of each planting case 10, so that the rear end of each float 12 can freely move up and down. It is pivotally connected by a pin 18 so that it can move. In this case, the planting depth adjustment shaft 16 is connected to the planting depth adjustment lever 20.
This planting depth adjustment lever 20 is rotated as appropriate at the guide plate 21 attached to the planting case 10.
A plurality of engagement grooves 22 provided in the holder allow the holder to be locked in an appropriate rotational position.

A support shaft 24 is horizontally fixed to the planting cases 10 of the two seedling planting units 14 located at the center among the planting units 14 of the seedling planting device 5 through brackets 23 that respectively project forward. On the other hand, each support shaft 24 has a planting depth correction link 25.
Rotatably insert the middle part of this modified link 2.
5 is connected via a rod 27 to the tip of a lever 26 that projects forward from the planting depth adjustment shaft 16.

A sleeve 29 is rotatably fitted onto the shaft 28 attached to the front end of each correction link 25, and the tip of an arm 30 that integrally projects forward from the sleeve 29 is attached to the front upper surface of the float 12. The upper end of the link 33, which is pivotally connected to the bracket 31 by a pin 32, is connected via a pin 34.

In addition, a trochanter 37 at the tip of a lever 36 protruding from a sensor 35 such as a rotary encoder fixed to each bracket 23 at the front end of the central planting case 10 is brought into contact with the upper surface of each float 12, 12,
The amount of vertical movement of each float 12 is used as a signal to relate to a control means 38, which will be described later (see FIGS. 1 and 2).

The control means 38 in this embodiment is based on an electric circuit, and includes a central control unit 39 and a switch 41 that inputs signals from the quantity sensors 35, 35.
, a relay 42 , an AND logic element 43 , and an OR logic element 44 .

The switch 41 is provided with a lever 40 that adjusts the sensitivity of the signals from both sensors 35, and by rotating the lever 40 to a predetermined position,
The control mode in the central control device 39 is configured to change between normal seedling planting work and leveling work.

That is, when the lever 41 of the switch 41 is placed in the normal seedling planting position, the relay 42 is actuated so that both sensors 35 are connected to the OR logic element 44, while when placed in the leveling position, both sensors 35 are connected to the OR logic element 44. but
The relay 42 is connected to the AND logic element 43.
In the normal seedling planting position, when one of the two floats 12 rises, the electromagnetic solenoid 45b of the switching valve 8 is energized and pressure oil is sent to the hydraulic cylinder 7 to plant the seedlings. When the seedling planting device 5 rises and, conversely, both floats 12 descend together, the central control device excites the electromagnetic solenoid 45a of the switching valve 8 to return pressure oil from the hydraulic cylinder 7 to the hydraulic tank 42 so that the seedling planting device descends. 39 is activated.

In any of the above cases, the height of the seedling planting device 5 relative to the field is automatically controlled to be approximately constant.

When the lever 41 of the switch 41 is placed in the leveling position, the seedling planting device 5 will rise only when both floats 12 rise at the same time, and the seedling planting device 5 will rise only when either of the floats 12 descends. The central control device 39 is activated to descend.

As a result, during leveling work, even if only one side of the float rides on a clod of soil, the seedling planting device 5
The surface does not rise immediately, but is leveled based on the lower float, resulting in a clean finished surface.

In addition, during leveling work, the sensitivity of the sensor 35 that detects the rise and fall of the float 12 is made dull by the switch 40, so that even if both floats 12 land on a protrusion of soft soil in the field, the seedling planting device 5 immediately rises. This is done to improve the leveling of the field.

It goes without saying that the control means in the present invention may be of mechanical construction as well as of electrical construction, and furthermore, the float equipped with a sensor can be controlled according to the number of rows of seedlings planted. It can be similarly applied to the case of three or more rice transplanters, and can be applied to both riding-type and walking-type rice transplanters.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an enlarged plan view of FIG. 4, FIG. 2 is a block diagram of the control device, and FIG. 3 is a sectional view of FIG.
The figure is a side view of the riding rice transplanter, and FIG. 5 is a plan view. 1... Traveling body, 2, 3... Wheels, 4... Link mechanism, 5... Seedling planting device, 7... Hydraulic cylinder,
8...Switching valve, 45a, 45b...Electromagnetic solenoid, 35...Sensor, 38...Control means, 39
... Central control unit, 41 ... Switch, 42 ... Relay, 43 ... AND logic element, 44 ... OR logic element.

Claims (1)

[Scope of utility model registration request] A seedling planting device equipped with at least two or more floats movable up and down; a hydraulic cylinder for moving the seedling planting device up and down with respect to a field; and a hydraulic cylinder that is switched to raise or lower the seedling planting device. In the rice transplanter, each of the plurality of floats is provided with a sensor that detects the vertical movement of each float, and a control means that switches the switching valve according to a signal from each sensor is provided with a sensor that detects the vertical movement of each float. a state in which the seedling planting device is raised by raising at least one float during a planting operation;
A rice transplanter, characterized in that it is provided with a switching means for selectively switching between a state in which the seedling transplanting device is raised only by raising the plurality of floats during leveling work in a field. Elevation control device.