JPS63177716A - Rice planter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to attitude control of a seedling planting section of a rice transplanter.

[Conventional technology]

Riding rice transplanters use lift control to maintain a constant seedling planting depth, but this is done by controlling the height of the seedling planting area from the rice field using a ground sensor installed at the bottom center of the seedling planting area. Detection has been done. The seedling planting section is connected to the fuselage so that it can freely roll around the front and rear axes, and even if the aircraft is tilted, the buoyancy acting on the floats installed on the left and right sides of the seedling planting section and the mud will be removed. The seedling planting section is configured to maintain its parallel state with the field surface as much as possible by the reaction force.

However, the buoyancy and reaction forces acting on the floats may not be sufficient to maintain the parallel state, and in recent years, research has been conducted into a rolling control function that forcibly corrects the inclination of the seedling planting area with respect to the rice field surface. An example of this structure is disclosed in Japanese Patent Laid-Open No. 149007/1983.

(Problems to be Solved by the Invention) For example, if the seedling planting part is tilted to the right and lowered from its proper position, the seedlings will be planted deeply as a whole.

In this state, first, when the lifting control mechanism is activated, the seedling planting section is tilted until the center of the seedling planting section is at the appropriate position based on the detection from the ground sensor provided at the lower center of the seedling planting section. It will be operated upwards.

Even if the rolling control mechanism is activated after the above-mentioned raising operation and the seedling planting section is returned to a state parallel to the field surface, the left side of the seedling planting section may be at a position lower than the proper position before the rolling control mechanism is activated. As the height increases, phenomena such as shallow planting or floating seedlings occur in the planting row on the left side.

The present invention focuses on the above-mentioned points and aims to prevent the above-mentioned phenomenon caused by the lifting control operation and the rolling control operation.

[Means for solving problems]

The feature of the present invention is that in a rice transplanter equipped with a lifting control mechanism and a rolling control mechanism for the seedling planting section, the control sensitivity of the rolling control mechanism is set to be more sensitive than the control sensitivity of the lifting control mechanism. Its action and effects are as follows.

[For production]

When configured as described above, the rolling control mechanism is activated first based on the detection of the inclination of the seedling planting section, and the raising/lowering control mechanism is activated after the seedling planting section is returned to a state parallel to the circular surface. become.

〔Effect of the invention〕

As described above, by using the sensitive rolling control, the raising and lowering control is performed while the seedling planting area is maintained parallel to the circular surface. Extreme rise and fall phenomena from the appropriate position in the row are prevented, and stable posture control of the seedling planting area is achieved without shallow planting, floating seedlings, or extremely deep planting.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figures 8 and 7, planting mission (1)
Planting claw (2) rotatably driven at the rear, planting mission (
The seedling planting section (5), which consists of a seedling stand (4) etc. that is slidably driven on the guide rail (3) of 1), is connected to the wheeled aircraft via a four-speed link mechanism (14). has been done.

This seedling planting part (5) is rotatably attached around the front-rear axis (P2) at the lower rear end of the four-speed link mechanism (14), and is attached to the upper rear end of the four-speed link mechanism (14) and the seedling planting part (5). stand (
4) A double-acting hydraulic cylinder (16) is installed across the rear support part (15), and this hydraulic cylinder (16)
By expanding and contracting the seedling planting part (5), the seedling planting part (5) can be rolled. The entire seedling planting section (5) can be raised and lowered by expanding and contracting the single-acting hydraulic cylinder (17) provided in the four-speed link mechanism (14).

As shown in FIGS. 2 and 7, the grounding flow detects the vertical movement and inclination of the seedling planting part (5) (6a),
(6b) are attached so as to be able to move up and down independently on the left and right sides, and an auxiliary flow (28) for posture maintenance is attached between both grounding flows (6a) and (6b). Then, as shown in the figure, the ground float (
6a) and (6b) are provided with rakes (22) for erasing the traces of the rear wheels (25). On the other hand, as shown in Figure 1, the horizontal axis (Pl) of the planting mission (1)
) A support arm (12) is swingably attached around the ground flow (12), and one end of the support arm (12) is attached to the ground flow (12).
The rear parts of (6a) and (6b) are swingably attached. As shown in FIGS. 1 and 4, a swingable guide member (13) extends from the front part of the grounding floats (6a) and (6b), and this guide member (13)
) is provided with an elongated crankshaft (7a), which will be described later.
The protrusion (7b) is engaged, and the ground float (
6a) and (6b) are vertically swingable around the end of the support arm (12), and the ground floats (6a) and (6
b) The entire unit is configured to be able to move up and down. The lower limit of vertical movement of the ground floats (6a) and (6b) can be adjusted by a bolt-type stopper (23).

As shown in Figures 1 and 2, the crankshafts (7a) and (7b) are opposed to each other on a straight line so as to be rotatable around the horizontal axis (P3) at the front of the planting mission (1). At the same time, the outer ends of both crankshafts (7a) and (7b) and the support arm (12) are interlocked and connected via a connecting rod (8). On the other hand, both crankshafts (
The protrusion direction is 1800 on the opposite side of 7a) and (7b).
Different first crank arms (18a), (18b)
is provided, and this first crank arm (18a
), the first arm (9) extends over both ends of (18b)
is constructed, and a control valve (
10) are connected via a link lot (11).

Furthermore, both crankshafts (7a) and (7b) have second crank arms (L9a) and (1
9b), and both second crank arms (1
9a).

A second arm (20) is installed across (19b).

Then, a third
7-muk 21) is provided, the front end of the third arm (21) is linked via a release wire (24) with a control valve (17Δ) for the hydraulic cylinder (17) for lifting/lowering operation, and A spring (26) is provided on the rear end side of the arm (21) to bias the third arm (21) and the like downward. A loft (27) extending upward from the center of the third arm (21) is a member that guides the vertical movement of the third arm (21) and the like.

With the structure described above, for example, when the seedling planting part (5) tilts to one side together with the aircraft body and one side of the ground float (6a) is displaced upward, this movement is caused by the support arm (12) as shown in FIG. ), linked lot (8), crankshaft (7a
) and a first crank arm (18a), and the first arm (9) is transmitted through the other first crank arm (18a).
b) Rotates for connection with. In this way, the first arm (
9) is activated, the center of the first arm (9) is aligned with the crankshaft (7a).

(7b) The center of the first arm (9) is displaced upward from the horizontal axis (P3) which is the rotation axis of the seedling planting part (5).
It is transmitted to the control valve (10) as the slope of . In this case, the second crank arm (
19a) also swings as shown in FIGS. 3 and 5, and the amount of vertical displacement of the third arm (21) is equal to the amount of displacement of the end of the second crank arm (19a). 1
It becomes 72.

The control valve (10) for rolling operation and the control valve (17A) for lifting operation are two spools that can be switched between three positions. The operation stroke length is set shorter than that of the control valve (17A) for lifting and lowering operations, and when the conditions shown in FIGS. 3 and 5 mentioned above occur, only the control valve (10) for rolling operation Hydraulic oil is supplied and discharged from the tank, and the seedling planting part (5) is corrected to be parallel to the mud surface by the hydraulic cylinder (16).

If the entire fuselage and seedling planting section (5) sinks and the left and right ground sensors (6a) and (6b) are displaced in one direction, both crankshafts (7a) will move as shown in Figure 6.
, (7b) rotate in the same direction, but since the protruding directions of the first crank arms (18a) and (18b) are opposite to each other, the first crank arms (9) and (7b) rotate in the same direction. It is supposed to rotate around the axis (P3) and the first
The center of the arm (9) is not displaced from the horizontal axis (P3), and the inclination of the seedling planting part (5) is not detected.

However, the second crank arm (19a), (], 9
b) extend in the same direction, so both second crank arms (19a) and (19b) swing in the same direction, as shown in the figure, and the third arm (21) moves in the vertical direction. The displacement amount is the second crank arm (19a), (19b)
is equal to the amount of displacement at both ends. Then, in such a state, the control valve (17A) for lifting/lowering operation is operated to the hydraulic oil supply/discharge position for the first time, and the hydraulic cylinder (
17), the seedling planting part (5) is operated upwards to maintain an appropriate height above the mud surface.

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 a rice transplanter according to the present invention. Figure 1 is a side view showing how the grounding float interacts with the rolling and lifting control valves, Figure 2 is a plan view showing how the grounding float interacts with the rolling and lifting control valves, and Figure 3 is a side view showing how the grounding float interacts with the rolling and lifting control valves. Fig. 4 is a front view of the front part of the grounding float, and Fig. 5 is a state in which the seedling planting section is tilted to the left in the direction of travel from the state shown in Fig. 1. Figure 6 is a diagram showing the entire seedling planting part sunk from the state shown in Figure 1, Figure 7 is a front view of the area around the seedling platform, and Figure 8 is a view of the riding type rice transplanter. It is an overall side view. (5) Seedling planting department.

Claims (1)

[Claims] A rice transplanter equipped with a lifting control mechanism that keeps the height of the seedling planting part (5) from the mud surface constant, and a rolling control mechanism that keeps the seedling planting part (5) parallel to the rice field surface, The rice transplanter is configured such that the control sensitivity of the rolling control mechanism is set to be more sensitive than the control sensitivity of the lifting control mechanism.