JPS5942812Y2 - Rice transplanter seedling succession device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for transferring seedling mats to a seedling platform in a seedling planting device of a rice transplanter.

Conventionally, in a rice transplanter such as a riding type in which a seedling planting device having a seedling stand is connected to a traveling machine so as to be movable up and down, the spare seedling stand provided on the body side is tilted so as to approach the upper end of the seedling stand. Due to this, a structure has been adopted in which a spare seedling mat on a spare seedling stand is added to the seedling stand.
The height position of the seedling planting device relative to the traveling machine changes depending on the depth of the plow in the field (the difference in height between the plowing surface where the wheels touch the ground and the field surface), and therefore As the relative height positional relationship with the seedling stand attached to the planting device changes depending on the depth of the tiller, the relationship between the seedling transfer position from the reserve seedling stand to the seedling stand also changes, so it is always the same. It is not possible to transfer seedlings depending on the posture, and in addition, conventional spare seedling stands are brought closer to the seedling stand by lowering the side of the seedling stand, and are tilted in the same direction as the seedling stand, so the tiller is In order to ensure that the spare seedling stand is always located above the top of the seedling stand even when the water is deep, the spare seedling stand must be installed at a considerably high position, which raises the center of gravity of the aircraft and makes it unstable. Not only that, but the spare seedling stand ended up blocking the worker's view to a large extent.

The present invention solves the above-mentioned drawbacks by raising the preliminary seedling stand placed on the machine body so that it approaches the seedling stand using a link mechanism that has a rotating base end on the side of the seedling planting device. be.

However, when the spare seedling stand placed on the machine body is raised by a link mechanism that has a rotating base end on the seedling device side, the weight of the spare seedling stand is transferred from the machine body to the seedling device when it is lifted. In consideration of the fact that the seedling planting device, which is attached to the machine in a vertically movable manner, descends and its float sinks to the place where it is placed, in this invention, while the preliminary seedling stand is being raised and lowered by the link mechanism, the rice planting The device is locked to prevent it from lowering into the aircraft.

Below, to explain the embodiments of the drawings, 1
2 shows a fuselage having a pair of left and right front wheels 2 and a pair of left and right rear wheels 8, and has an engine 4 and a control handle 5 on the front upper surface, and a control seat 6 on the midway upper surface. From the output shaft 7 to the mission case 8 on the fuselage 1
Power is transmitted through a belt 9 to the transmission case 9, and the power is transmitted to the front wheels 2 and rear wheels 3 to drive the aircraft 1. A main clutch 11 is provided to cut off power transmission to the transmission case 8, and the clutch pedal 10 is connected to the main clutch 11 by hydraulic pressure.
The engine 4 is equipped with a hydraulic cylinder 12 with a spring 13 adapted to disconnect the engine 4, and a hydraulic pump 16 which is constantly driven by a belt 15 from the engine 4 independently of the main clutch 11 on the lower surface of the engine 4.

Reference numeral 17 denotes a seedling planting device located at the rear of the body 1, and the seedling planting device 17 includes a transmission case 19 having a vertically swinging seedling planting mechanism 18 at the rear end, a float 20 attached to the lower surface of the transmission case 19, and Seedling stand 21 tilted so that the upper end approaches the aircraft body
The seedling stand 21 has a lower end connected to the transmission case 19.
A trochanter 25 at the upper end of an arm 24 erected from the transmission case 19 is fitted into a rail 23 provided halfway on the back side of the guide rail 22 for seedling extraction attached to the top surface, and reciprocated in the left and right directions. is configured to do so.

This seedling planting device 17 includes a support 26 erected at the front end of the transmission case 19, a hitch 27 attached to the rear end of the body 1, and pins 30, 31. 32.33 A pair of left and right vertical parallel link mechanisms 34 and 34 consisting of a pair of upper and lower equal length links 28 and 29 are connected to the fuselage 1 so as to be movable up and down, and the parallel link mechanism 34 and the hitch 27 are It is configured to move up and down with a hydraulic cylinder 35 installed between the
In addition, power is transmitted to the seedling planting device 17 from the mission case 8 on the body 1 via a flexible shaft (not shown) or the like.

Reference numeral 36 denotes a spare seedling stand placed on a supporting stand 31 provided on the upper surface of the rear portion of the machine body 1, and 38 denotes an elevating and descending slope that is located below the spare seedling stand 86 and lifts up the spare seedling stand 36 by rising. are shown, and pins 41 and 42 are attached to the upper part of the support column 26 at the front end of the seedling planting device 11, respectively, and the proximal end thereof is
A parallel link mechanism 43 for raising and lowering the preliminary seedling stand is provided, which consists of a pair of upper and lower equal-length links 39 and 40 that are pivotally connected, and the lifting and lowering ramp 88 is rotatably attached to the tip of the upper link 39 in the parallel link mechanism 43. 44 pivots, and the pin 4
A hydraulic cylinder 45 for raising and lowering a preliminary seedling stand is installed between the link mechanism 43 and the body 1, and a pin 46 provided at the tip of the lower link 40 is attached to the upper end of the hitch 27 to the body 1. At the same time, a hydraulic cylinder q for tilting is installed between the pin shaft and the lifting/lowering ramp 38.

The parallel link mechanism 43 for raising and lowering the preliminary seedling stand has a quadrilateral shape that is congruent with the parallel link mechanism 34 for raising and lowering the seedling planting device 11, and the upper link 39 is connected to the lower link at the upper limit position of the lifting slope 38. An adjustable screw-type lift stopper 48 is provided which stops the lift by contacting the upper and lower links 39 and 40, and the upper end of the link 49, which is pivotally connected with a pin between the upper and lower links 39 and 40, is provided with an upward and downward slope. An adjustable screw-type tilt stopper 50 is provided at a position close to the seedling platform 17 of the seedling planting device 17 to restrict the tilting movement when the platform 38 is tilted.

51 is a switching valve for performing seedling succession work, 52 is a seedling planting device 17
In the normal state, the hydraulic pump 16
A circuit 53 from the lift valve 52 is connected to a circuit 54, a circuit 55 from the lift switching valve 51 is connected to a circuit 56 to the lift hydraulic cylinder 35, and a circuit to the hydraulic cylinder 12 of the clutch pedal 10 is connected. 51 and a circuit 58 to the hydraulic cylinders 45 and 47 for lifting and tilting the preliminary seedling stand are connected to the oil tank, and by the switching operation thereof,
The circuit 53 from the hydraulic pump 16 to the switching valve 52 and the circuit 56 to the hydraulic cylinder 35 are disconnected, and the hydraulic pump 16 is connected to the circuits 57 and 58.

The lift switching valve 52 is installed near the pilot's seat 6, and its lever 52' cuts off the hydraulic pressure going in and out of the lift hydraulic cylinder 35, in the neutral position, and in the lift position, it sends the hydraulic pressure from the hydraulic pump 16 to the hydraulic cylinder 35. It is configured to be able to switch between three positions: a lower position and a lowered position in which the hydraulic pressure of the hydraulic cylinder 35 is released into the oil tank.

Furthermore, the hydraulic cylinder 45 for raising and lowering the preliminary seedling table and the hydraulic cylinder 41 for tilting operate so that the hydraulic cylinder 45 for raising and lowering operates first, and the stopper 48 of the upper link 39 in the parallel link mechanism 43 comes into contact with the lower link sum. Afterwards, in order for the tilting hydraulic cylinder 47 to operate, the diameter of the lifting hydraulic cylinder 45 is made larger than the diameter of the tilting hydraulic cylinder 41, while a circuit 59 from the hydraulic circuit 58 to the lifting hydraulic cylinder 45 is , a check valve 60 and a throttle 61 are provided in parallel, so that the tilting hydraulic cylinder 41 is connected to the lifting hydraulic cylinder 4.
The system is configured so that the worker leaves work before 5.

In this configuration, when the lift switching valve 52 is operated to switch to the raised position, hydraulic pressure is sent to the lift hydraulic cylinder 85, the seedling planting device 11 rises, and the switching valve 52 is brought to the neutral position at the desired raised position. As a result, the lift stops at the raised position.

During rice planting work, while feeding seedling mats onto the seedling platform 2.1, a spare seedling mat is placed on the preliminary seedling platform 36, and the seedling planting device 17 is lowered by operating the switching valve 52 to the lowered position. As a result, the float 20 touches down on the field 62, and in this state, the body 1 moves forward and the seedling planting device 17
By driving the seedling table 21, the seedling mat on the seedling platform 21 is divided one by one by the seedling planting mechanism 18, and then the seedlings are successively planted in the field area 62.

During this rice planting work, when the number of seedling mats on the seedling stand 21 becomes low or disappears, seedling transfer is performed to transfer the spare seedling mats on the spare seedling stand 36 onto the seedling stand 21.

During this seedling splicing work, the switching valve 51 for seedling splicing work is switched.

Then, the hydraulic pressure supply from the hydraulic pump 16 to the switching valve 52 and the hydraulic cylinder 35 to the oil tank are cut off, so that from then on the switching valve 52 will not move up or down regardless of the switching valve 52, and will be locked so that it cannot go up or down. Hydraulic pressure from a hydraulic pump 16 is sent to a hydraulic cylinder 12 that is linked to the pedal 10, which operates the hydraulic cylinder 12, rotating the clutch pedal 10 in the same direction as the foot pedal and turning the main clutch 11 off.
At F, the power transmission from the engine 4 to the transmission case 8 is cut off, the drive of the seedling planting device 17 and the traveling of the machine body 1 are stopped, and the rice planting work is interrupted.

At the same time, the hydraulic pressure from the hydraulic pump 16 is sent to the hydraulic cylinders 45 and 47 for lifting and tilting the reserve seedling stand, and the lifting hydraulic cylinder 45 is first operated to project, and the lifting and lowering ramp 3
8 rises from the horizontal state 1\, and in the middle of the rise, lifts the spare seedling stand 36 from the horizontal state casing\, and lifts the upper link 39
The stopper 48 of is raised at 1 when it comes into contact with the lower link 40.

Next, the tilting hydraulic cylinder 47 is operated to project, and the elevating and lowering ramp 38 is tilted at the edge that contacts the tilt stopper 50, and the preliminary seedling stand 36 on the upper surface approaches the seedling loading table 21, and the seedling loading table is closed. Since it slopes in the same direction as 21, spare seedling stand 3
The spare seedling mat on top of 6 can be stretched a little on the seedling stand 21.
Seedlings can be transferred to the top.

When this seedling joining is completed, by operating the seedling joining work switching valve 51 to the original position, the hydraulic pressure of the hydraulic cylinder 12 in the clutch betatal 10 is released, and the main clutch ll0
N, the seedling planting device 17 is driven, and at the same time, the machine body 1 starts moving forward and the rice planting work is resumed.

On the other hand, the circuit 58 to the oil cylinders 45 and 47 for lifting and tilting the preliminary seedling stand is opened to the oil tank, or the hydraulic cylinder 47 for tilting is retracted, and the preliminary seedling stand 38 is returned to a substantially horizontal position. Next, the lifting hydraulic cylinder 45 moves to retract.
The preliminary seedling stand 38 is lowered 1\ from a horizontal state and placed on the support stand 37 of the machine body 1, completing the seedling splicing work.

When the link mechanism 48 lifts up the spare seedling stand 36 on the support stand 37 of the machine body 1 during the seedling transfer work, the weight of the spare seedling stand 36 that was acting on the machine body 1 side is transferred from the machine body to the seedlings. Shifting to the device 17 side, the ground pressure of the float 20 in the seedling planting device 17 increases, the float 20 sinks into the side scene 62 and sinks, and the seedling planting depth changes when the next rice transplanting operation is started. However, in the present invention, when the switching valve 51 for seedling succession work is switched to send hydraulic pressure to the circuit 58 to the hydraulic cylinder 45, 47 for lifting and tilting the preliminary seedling stand, the operation of the preliminary seedling stand 36 is changed. At the same time as the raising starts, the flow of hydraulic pressure from the switching valve 52 controlling the lifting hydraulic cylinder 35 of the seedling planting device 17 to the hydraulic pump 16 and the oil tank is cut off, and the hydraulic cylinder 35 prevents the seedling planting device 17 from descending. Therefore, even if the weight of the preliminary seedling stand 36 is transferred to the side of the seedling planting device 17 as it rises, the seedling planting device 17 will not descend relative to the machine body 1, preventing it from sinking into the field. When the seedling transfer operation is completed, the seedling planting device 17 is released from the locked state with respect to the machine body, and is placed in a grounded state with a constant ground pressure against the field.

In addition, in the above embodiment, the seedling planting device was locked so that it could not be lowered by cutting off the hydraulic pressure in and out of the switching valve of the hydraulic cylinder for lifting and lowering the seedling device during seedling splicing work. However, the present invention is not limited to this, and other means such as cutting the circuit 56 to the hydraulic cylinder 35 or locking the seedling planting device so that it cannot be lowered during the seedling transfer operation may be used. 86 is directly attached to the lifting/lowering ramp 88 and connected to the hitch 27 via the tip of the link mechanism 43.
It is not a long time ago that this method could also be applied to devices that support the weight of a spare seedling stand on the side of the aircraft.

As described above, the present invention provides a seedling planting device which is connected to a machine body having running wheels so as to be able to rise and fall freely by an elevating mechanism, and is provided with a seedling platform whose upper end is inclined toward the machine body. A link mechanism for raising and lowering a preliminary seedling stand having a rotating base end is provided at the top, a spare seedling stand supported by the body is disposed at the tip of the link mechanism, and the lifting mechanism of the seedling planting device has a link mechanism for raising and lowering the stand It is provided with a means for locking the seedling planting device so that it cannot be lowered when the spare seedling stand is raised and lowered by the mechanism, and the rotating base end of the link mechanism for raising and lowering the spare seedling stand is provided on the side of the seedling planting device. Therefore, if the seedling planting device moves up and down in response to changes in the depth of the tiller, the rotating base end of the link mechanism will also move up and down at the same time, and the link mechanism will move around the higher or lower rotating base end as the center point. Since the preliminary seedling stand is raised and lowered by vertical swinging, the relative positional relationship between the two when the preliminary seedling stand is brought close to the upper end of the seedling stand depends on the height of the seedling planting device and the depth of the tiller in the field. Seedling work can be carried out in a substantially constant position without being affected by fluctuations, and the present invention is a preliminary seedling stand.
Because it is raised by a link mechanism that rotates upward with the seedling planting device side as the base end, it can be brought close to the upper end of the seedling platform.
The spare seedling stand can be installed lower than the top of the seedling stand. Therefore, the height of the center of gravity of the machine does not become high, improving the running stability of the rice transplanter, and the operator's field of view is improved by the stand. This reduces obstruction and improves visibility.

In addition, the present invention locks the seedling planting device so that it cannot be lowered slightly when raising and lowering the preliminary seedling stand, so the float of the seedling planting device does not sink into the field during seedling succession work.
Therefore, the planting depth and planting posture of seedlings in the field can be maintained in substantially the same state before, during and after seedling succession.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a rice transplanter, FIG. 2 is a plan view of the rear part of the rice transplanter, and FIG. 3 is a diagram showing a hydraulic circuit. 1... Airframe, 2... Front wheel, 3... Rear wheel, 17
... Seedling planting device, 21... Seedling stand, 34... Link mechanism, 36... Spare seedling stand, 38... Elevating and lowering slope table, 4
3... Spare seedling stand link mechanism, 35... Hydraulic cylinder for raising and lowering the seedling planting device, 51... Switching valve for seedling splicing work, 52
...Switching valve.

Claims (1)

[Scope of utility model registration request] A seedling planting device connected to a machine body having running wheels so as to be able to rise and fall freely by a lifting mechanism is provided with a seedling platform that is inclined toward the body side, and the seedling planting device has a rotating base end thereon. A link mechanism for raising and lowering a spare seedling stand is provided, and a spare seedling stand supported by the body is disposed at the tip of the link mechanism, and the lifting mechanism of the seedling planting device has a link mechanism for lifting and lowering the spare seedling stand by the link mechanism. A seedling splicing device for a rice transplanter, which is provided with a means for locking the seedling planting device so that it cannot be lowered when the seedlings are transplanted.