JPH04112712A - Transplantation machine - Google Patents

Abstract

PURPOSE:To dispense with a hydraulic pump exclusive for vertical motion and with a long exclusive piping by providing a hydraulic transfer apparatus for lowering a seedling and connecting the apparatus to a lifting hydraulic cylinder of a seedling transplantation apparatus in a specific state. CONSTITUTION:A change-over valve 18 is operated to a connected state each time a seedling table reaches a stroke end. A hydraulic oil is sent from a hydraulic oil chamber 3a of a lifting hydraulic cylinder 3 supporting the seedling transplantation apparatus toward a hydraulic oil chamber 12b for vertical transfer maintained in low-pressure state. The seedling is vertically transferred by the action. The hydraulic oil chamber 3a is replenished with the hydraulic oil by an electromagnetic hydraulic control valve V.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a seedling planting device equipped with a seedling stand that reciprocates from side to side with a constant stroke, which is connected to the device so that it can be driven up and down by a single-acting hydraulic cylinder. The present invention relates to a rice transplanter equipped with a lift control means for maintaining a seedling planting device at a predetermined height relative to the mud surface based on the relative vertical movement of a grounding body due to changes in ground pressure.

[Conventional technology]

In the above-mentioned rice transplanter, conventionally, for example,
As shown in Japanese Patent No. 715, a seedling vertical feeding device is provided on the seedling placement surface of the seedling platform to feed the placed seedlings downward by a predetermined amount at the end of the horizontal movement stroke, and this vertical feeding device is It was configured to be driven by rotating the rotating arm by a predetermined amount using a rotating cam protruding from the case.

[Invention or problem to be solved]

However, the above-mentioned conventional structure is driven by mechanical contact and rotation, and since such vertical feeding drive is frequently performed, it has a drawback of poor durability. In particular, in recent years, in order to improve work efficiency, devices configured in a multi-row type and structures that drive other devices in synchronization with vertical feeding have been developed, and in such cases, , the above drawbacks were noticeable.

The present invention aims to solve the above-mentioned problems.

[Means to solve the problem]

The characteristic configuration of the present invention is that in the rice transplanter described at the beginning,
A hydraulically driven vertical feeding device is provided for vertically feeding the seedlings placed on the seedling stand in a predetermined amount downward, and the hydraulic oil chamber of the lifting hydraulic cylinder and the hydraulic oil chamber of the vertical feeding device are connected to the hydraulic oil chamber of the vertical feeding device. They are connected via a switching valve that switches to a communicating state only at the end of the stroke of the seedling stand.

[For production]

When reaching the seedling platform or the stroke end, the switching valve switches to the communication state, and the hydraulic oil chamber of the lifting hydraulic cylinder, which supports the entire weight of the seedling planting device and is under high pressure, is transferred to the low-pressure vertical feed hydraulic oil chamber. Oil flows toward the amount of hydraulic oil, and vertical feed drive is performed.

At the second time, either the seedling planting device tries to descend slightly due to a decrease in the hydraulic oil in the hydraulic cylinder, or the pressure oil is replenished by the operation of the lift control means, and the height relative to the mud is maintained as it is.

〔Effect of the invention〕

As a result, in order to support the full weight of the seedling planting device, the hydraulic oil of the large-flow, high-pressure lifting hydraulic cylinder is used as the hydraulic source for vertical feeding. It was possible to obtain a vertical feed structure with excellent durability without requiring any piping or significantly complicating the structure.

Furthermore, even if a conventional abutment rotation mechanism is used to detect the end of the stroke of the seedling stand, the driving load is only the switching operation load of the switching valve, so the durability will be significantly improved. Become.

〔Example〕

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

As shown in FIG. 4, a riding type rice transplanter is constructed by connecting a seedling planting device (2) to the rear of a riding type traveling machine body via a four-speed link mechanism (1) so as to be able to move up and down.

The seedling planting device (2) is configured to be driven up and down by a single-acting hydraulic cylinder (3), and is installed in a downward-sloping position at the rear, and is driven back and forth to the left and right at a constant stroke with the seedlings placed on the mat. A seedling stand (4), a planting mechanism (5) that cuts and plants seedlings one by one from the lower end of the seedling stand (4), and a ground float (5) that is attached so that it can move up and down relative to each other and slides over the mud surface planting. 6) [Example of grounding body] etc.

Further, there is provided an elevation control means for maintaining the seedling planting device (2) at a predetermined height relative to the mud surface based on the relative vertical movement of the ground float (6) due to ground pressure fluctuations.

Specifically, as shown in FIGS. 1 and 2, a potentiometer (PM) is provided above the ground float (6) to detect the relative vertical movement of the ground float (6), and this potentiometer (PM) The control device (7) controls the electromagnetic hydraulic control valve (V) of the lifting hydraulic cylinder (3) so that the output falls within a predetermined setting range,
The seedling planting device (2) is configured to maintain the height of the soil surface at a predetermined value.

A hydraulically driven vertical feeding device (8) is provided at the lower part of the seedling platform (4) to vertically feed the placed seedlings downward by a considerable amount at the end of the horizontal movement stroke. be. As shown in Fig. 2, this vertical feeding device has a locking projection (
It is constructed by winding an endless rotary belt (1) with an attached belt (10) so as to be rotatably driven, and is rotatably driven by a hydraulic cylinder (12).

In other words, as shown in Fig. 3, the lower drive roller (
A one-way clutch (14) is attached to the pivot shaft (13) of
) The drive chain is once connected and fixed to a predetermined location of the sprocket member (15) attached via the sprocket member (15), and the other end of the chain (16) is connected to the piston rod (12a) of the hydraulic cylinder (12). , hydraulic cylinder (1
The rotary belt (11) is configured to be driven to rotate by supplying pressure oil to the hydraulic oil chamber (12B) of 2). The cylinder body (12C) of the hydraulic cylinder (12) is fixedly attached to a bracket (17) fixed to the seedling stand (4).

And the hydraulic oil chamber (3) of the lifting hydraulic cylinder (3)
a) and the hydraulic oil chamber (12B) of the vertical feeding device (8) are connected via a switching valve (18) that is switched to a communicating state only at the end of the stroke of the seedling stand (4). More specifically, as shown in FIG. 1, the switching valve (18) connects both the hydraulic oil chambers (3a) and (12b) by rotating the rotating spool (19) at a predetermined angle. As shown in Fig. 3, the circuit is configured to switch between a connected state and a closed state to discharge the hydraulic oil into the tank (T). A rotation shaft (23) on which the movable cams (21), (21) abut and engage with the retaining pieces (22), (22) at the stroke end of the seedling stand (4) and are rotated by a predetermined angle. The switching valve (18) is disposed at the end of the shaft, and the rotating shaft (23) and the rotating spool (19) are rotatably provided together.

In this way, only at the stroke end of the seedling platform (4), the lifting hydraulic pressure is maintained at high pressure (several tens of kg/Ci to 100 kg/cd), supporting the entire weight of the seedling planting device (2). Hydraulic oil is supplied from the hydraulic oil chamber (3a) of the cylinder (3), and vertical feed operation is performed. Since the hydraulic power source for vertical feeding requires low pressure and low flow rate (approximately 20 kg/ad, 1 Occ), the hydraulic fluid in the lifting hydraulic cylinder (3) may be reduced slightly, or due to this, it may be difficult to plant seedlings. Device (2)
Even if the seedling planting device (2) attempts to descend slightly, the hydraulic oil is replenished by the above-described elevation control, so that the seedling planting device (2) maintains a predetermined level.

It should be noted that the present invention is not limited to the structure of the attached drawings by adding numerals in the claims for convenient comparison with the drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the rice transplanter according to the present invention, in which Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a side view of the rear part, Fig. 3 is a vertical front view of the lower part of the seedling-laying area, and Fig. 4 is an overall side view. It is a diagram. (2)...Seedling planting device, (3)...Hydraulic cylinder, (4)...Seedling stand, (6)...
...Grounding body, (8) ...Vertical feed device, (3
a), (12b)... Hydraulic oil chamber, (18).
...Switching valve. 1st piece

Claims (1)

[Claims] A seedling planting device (2) equipped with a seedling stand (4) that reciprocates from side to side with a constant stroke is connected to the device so that it can be raised and lowered by a single-acting hydraulic cylinder (3), and the ground pressure of the grounding body (6) varies. The rice transplanter is equipped with a lifting control means for maintaining the seedling planting device (2) at a predetermined height relative to the mud surface based on the relative vertical movement accompanying the movement of the seedlings. A hydraulically driven vertical feed device (8) is provided which vertically feeds the vertical feed device (8) by a predetermined amount, and includes a hydraulic oil chamber (3a) of the lifting hydraulic cylinder (3) and a hydraulic oil chamber (3a) of the vertical feed device (8). 12B) via a switching valve (18) that is switched to a communicating state only at the stroke end of the seedling stand (4).