JPS5942816Y2 - 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 seedling planting device changes depending on the depth of the tiller, the relationship between the seedling transfer posture from the spare seedling stand to the seedling stand also changes, so It is not possible to transfer seedlings in the same position, 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. In order to ensure that the spare seedling stand is always located above the top of the seedling stand even when the seedlings are 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 also severely obstructed the worker's view.

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, raising the preliminary seedling stand placed on the machine body using a link mechanism that has a rotating base end on the side of the seedling planting device is difficult because the seedling planting device moves up and down depending on the field conditions during rice planting work. This movement propagates to the spare seedling stand, and the spare seedling stand moves up and down and back and forth due to the vertical movement of the seedling planting device, causing damage to the spare seedling mat on the stand, or the load collapsing. In view of this, the present invention is to support the link mechanism of the spare seedling stand on the body in its lowered position, and configure it as a parallel link mechanism that is approximately parallel to the lifting link mechanism of the seedling planting device. This prevents the preliminary seedling stand from moving in response to the vertical movement of the seedling planting device.

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 3, and has an engine 4 and a control handle 5 on the front upper surface, and a pilot seat 6 on the midway upper surface. Mission case 8 on aircraft i from output shaft 7
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 so that the aircraft 1 travels. The main clutch 11 is equipped with a main clutch 11 configured to cut off the power transmission to the transmission case 8 by the clutch pedal 10.
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 machine 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 flowm 20 attached to the lower surface of the transmission case 19, and a seedling planting device 17. 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 upper surface, and reciprocated in the left and right directions. is configured to do so.

This seedling planting device 17 has a pair of upper and lower equal-length links that are pivoted by pins 30, 31, 32, and 33 on a support 26 erected at the front end of the transmission case 19 and a hitch 27 attached to the rear end of the body 1, respectively. A pair of left and right vertical parallel link mechanisms 34 and 34 consisting of 28 and 29 are connected to the fuselage 1 so as to be able to move vertically, and a hydraulic cylinder 35 installed between the parallel link mechanism 34 and the hitch 27 allows vertical movement. The seedling planting device 17 is configured to move up and down, and power is transmitted from the mission case 8 on the body 1 via a flexible shaft (not shown) or the like.

36 is a spare seedling stand located on the rear upper surface of the aircraft 1; 38
respectively indicate an elevating and descending ramp located below the preliminary seedling stand 36 and lifting up the preliminary seedling stand 86 by rising;
At the top of the support column 26 at the front end of the seedling planting device 17,
There is provided a parallel link mechanism 43 for a preliminary seedling stand consisting of a pair of upper and lower equal-length links 39° and 40 whose base ends are pivoted with pins 41 and 42, respectively. The tilting table 38 is rotatably attached to the pin 44, and a hydraulic cylinder 45 for raising and lowering the preliminary seedling table is installed between the pin 44 and the machine body 1, and the lower link 40
The pin 46 provided at the tip of the hitch 27 is attached to the fuselage 1.
The pin 46 is supported in contact with the stopper part 2γ at the upper end (in this case, the lifting/lowering ramp 38 may be supported in contact with the stopper part 27'), and a tilting support is provided between the pin 46 and the lifting/lowering ramp 38. A hydraulic cylinder 47 is installed.

This spare seedling stand parallel link mechanism 43 is approximately parallel to the lifting parallel link mechanism 34 of the seedling planting device 17 in the lowered position in contact with the stopper part 27' of the machine body 1, and is connected to the upper link 39 of the seedling stand parallel link mechanism 43. is provided with an adjustable screw-type lift stopper 38 that stops the lift by coming into contact with the lower link 40 at the upper limit position of the lift ramp 38, and pins are installed between the upper and lower links 39 and 40 respectively. At the upper end of the pivoted link 49, there is an adjustable screw-type tilt stopper 50 that restricts the tilting movement at a position close to the seedling platform 17 of the seedling planting device 17 when the lifting ramp 38 is tilted. is provided.

51 is a switching valve for performing seedling succession work, 52 is a seedling planting device 17
The vertical switching valves 51 for lifting and lowering the seedlings are shown, and the switching valve 51 for seedling splicing operation is connected to the hydraulic pump 16 in the normal state.
The circuit 53 from the lift switching valve 51 is connected to the circuit 54 to the lift switching valve 52, the circuit 55 from the lift switching valve 51 is connected to the circuit 56 to the lift hydraulic cylinder 35, and the clutch pedal 10 is connected to the hydraulic cylinder 12. A circuit 57 and a circuit 5 to the hydraulic cylinder 45, 47 for lifting and tilting the preliminary seedling stand.
8 is connected to the oil tank, but due to the switching operation, the circuit 58 from the hydraulic pump 16 to the switching valve 52 and the circuit 56 to the hydraulic cylinder 85 are cut off.
The hydraulic pump 16 is configured to be connected to the circuits 51 and 58.

The lift switching valve 52 is mounted near the operator's seat 6 and has a lever 52' at a neutral position where hydraulic pressure is cut in and out of the lift hydraulic cylinder 35, and a lift switch valve 52 in which the hydraulic pressure from the hydraulic pump 16 is sent 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 47 for tilting operate so that the hydraulic cylinder 45 for raising and lowering operates first, and the stopper 48 of the upper link 89 in the parallel link mechanism 43 comes into contact with the lower link 40. After that, the diameter of the lifting hydraulic cylinder 45 is configured to be larger than the diameter of the tilting hydraulic cylinder 47 so that the tilting hydraulic cylinder 47 operates, and the lifting hydraulic cylinder 45 is connected to the hydraulic circuit 58.
A check valve 60 and a throttle 61 are provided in parallel in the circuit 59 leading to the tilting hydraulic cylinder 47, so that the tilting hydraulic cylinder 47 moves backward before the lifting hydraulic cylinder 45.

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 35, the seedling planting device 17 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 the rice planting work, a seedling mat is supplied onto the seedling platform 21, 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 lower position. Since the float 20 touches the field 62, the machine body 1 moves forward in this state and the seedling planting device 17 is driven, so that the seedling mat on the seedling platform 21 is divided into individual plants by the seedling planting mechanism 18. After that, seedlings are sequentially planted in the field scene 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 pressure from the hydraulic cylinder 35 to the oil tank are cut off.After that, it does not move up or down regardless of the switching valve 52, and is locked so that it cannot be raised or lowered. The hydraulic pressure from the hydraulic pump 16 is sent to the hydraulic cylinder 12 linked to the clutch pedal 10, which operates the hydraulic cylinder 12.
0 in the same direction as the foot pedal and turn the main clutch l1ftOF.
When it is set to 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 running 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 46 and 47 for lifting and tilting the preliminary seedling stand, and the lifting hydraulic cylinder 45 is first operated to project, and the lifting and lowering ramp 3
8 In turn, the preliminary seedling stand 36 rises 11 from the horizontal state, and rises at 1 when the stopper 48 of the upper link 39 comes into contact with the lower link 40.

Next, the tilting hydraulic cylinder 41 is operated to protrude, 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 placed on seedling stand 2 by stretching it slightly.
1. Seedlings can be transferred to the top.

When this seedling joining is completed, by operating the seedling joining work switching valve 51 to its original position, the hydraulic pressure of the hydraulic cylinder 12 in the clutch pedal 10 is released and the main clutch I
When the power is turned on and the seedling planting device 17 is driven, the machine body 1 starts moving forward and the rice planting work is resumed.

On the other hand, oil cylinders 45.47 for lifting and tilting the preliminary seedling stand
Since the circuit 58 to the oil tank is opened to the oil tank, the tilting hydraulic cylinder 47 is first retracted to return the preliminary seedling stand 38 to a substantially horizontal position, and then the lifting hydraulic cylinder 45 is retracted to return the preliminary seedling stand 38 to a substantially horizontal position. 38 is lowered to the horizontal position 11 and placed on the stopper 27' of the hitch 27 of the machine body 1, completing the seedling splicing work.

Then, in a state in which the spare seedling stand 36 is lowered so that its parallel link mechanism 43 comes into contact with the stopper part 27' of the body 1, the spare seedling stand parallel link mechanism 43 34, if the seedling planting device 17 moves up and down due to variations in the depth of the plow in the field, this movement will cause the preliminary seedling stand 36 to move in the front-back direction via the parallel link mechanism 43 for the spare seedling stand. In other words, the preliminary seedling stand 36 is used as the seedling planting device 1 during the rice planting operation.
In addition, if the preliminary seedling stand 36 is not supported in the lowered position, the preliminary seedling stand 36 will move in response to the vertical movement of the seedling planting device during rice planting work. The vertical and back-and-forth movement of the preliminary seedling stand 36 during this rice planting operation may damage the spare seedling mat placed thereon, or cause the seedling mat to collapse and fall.

On the other hand, in the present invention, since the parallel link mechanism 43 of the preliminary seedling stand 36 is supported by contacting the stopper 27' of the machine body in the lowered position, the seedling planting device 11 during the rice transplanting operation
The spare seedling stand 36 does not move up and down in response to the vertical movement of the stand 7, and the parallel link mechanism 43 for the spare seedling stand does not move up and down.
Since it is configured to be substantially parallel to the parallel mechanism 34 for the seedling planting device in its lowered position, the vertical movement of the seedling planting device 17 will not be transmitted to the preliminary seedling stand 36 as a back and forth movement.

In other words, the spare seedling table 36 does not move up and down or forward or backward in response to the vertical movement of the seedling transplanting device 17 during the rice planting operation, and remains stationary, so that the spare seedlings placed on it remain stationary. This prevents the mat from being damaged and the seedling mat from falling due to back strain.

As described above, the present invention provides a seedling planting device that is vertically movably connected to a machine body having running wheels via a parallel link mechanism with a pair of upper and lower equal-length links, and is provided with a seedling platform whose upper end is inclined toward the machine body. On the other hand, the base end of a parallel link mechanism constituted by a pair of upper and lower equal-length links extending upward from the machine body is pivotally connected to the seedling planting device, and the tip of the parallel link mechanism is attached to the seedling platform by its upward movement. A spare seedling stand is provided to approach, and the machine body is provided with a stopper that contacts the parallel link mechanism for the spare seedling stand or the spare seedling stand in a state substantially parallel to the parallel link mechanism for the seedling planting device in its lowered position. The rotating base end of the parallel link mechanism for raising and lowering the preliminary seedling table is provided on the seedling planting device side, so that when the seedling planting device moves up and down in response to changes in the depth of the tiller, the parallel link mechanism The rotating base end of the mechanism also moves up and down at the same time, and the parallel link mechanism moves up and down with the raised or lowered rotating base end as the center point to raise and lower the reserve seedling stand. The relative positional relationship between the two when close to the upper end is not affected by changes in the height of the seedling planting device or the depth of the tiller in the field, and seedling transfer work can be performed in a substantially constant position. In the present invention, the preliminary seedling stand is raised and brought closer to the upper end of the seedling stand by a link mechanism that rotates upward with the seedling planting device side as the rotational base. It can be installed in a low place, so the height of the center of gravity of the machine does not become high, improving the running stability of the rice transplanter, and the worker's field of view is less obstructed by the spare seedling stand, improving visibility. be.

In addition, in the present invention, the spare seedling stand does not move in response to the vertical movement of the seedling planting device during rice transplanting, so there is no risk of damaging the spare seedling mat on the spare seedling stand during rice transplanting. In addition, the seedling mats do not fall, and rice transplanting work can be carried out with peace of mind.

[Brief explanation of the drawing]

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 mounting stand, 34... Parallel link mechanism for seedling planting device, 86... Spare seedling stand, 38...
Elevating and lowering slope table, 43... link mechanism for spare seedling stand, 35.
...Hydraulic cylinder for lifting and lowering the seedling planting device, 45...Hydraulic cylinder for lifting and lowering the spare seedling stand, 27'...Stopper.

Claims (1)

[Scope of utility model registration request] A seedling planting device that is connected to a body having running wheels so as to be vertically movable via a parallel link mechanism with a pair of upper and lower equal-length links is provided with a seedling stand whose upper end is inclined toward the body, and the seedling planting device The base end of a parallel link mechanism constituted by a pair of upper and lower equal-length links extending upward from the body is pivotally connected, and a spare seedling stand is provided at the tip of the parallel link mechanism, which approaches the seedling stand by its upward movement. , a seedling transfer machine for a rice transplanter, wherein the machine body is provided with a stopper that contacts the spare seedling stand parallel link mechanism or the spare seedling stand in a state substantially parallel to the seedling transplanting device parallel link mechanism in its lowered position; Device.