JPS629768Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for transferring seedlings to a seedling mounting table 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. Accordingly, a configuration has been adopted in which spare seedling pine on a spare seedling stand is added to the seedling stand, but in this case,
Japanese Utility Model Application Publication No. 53-100429 as a prior art discloses a seedling stand by configuring a spare seedling stand so that the seedling stand side of the spare seedling stand moves toward the seedling stand side while descending. Since the seedling stand is tilted in the same direction as the seedling stand, the spare seedling stand must be installed at a higher position than the top of the seedling stand, which raises the center of gravity of the aircraft and makes it difficult to move. Not only does it become more stable, but the reserve seedling stand greatly obstructs the operator's view.Furthermore, tilting the reserve seedling stand from the beginning of seedling succession means that the stand is tilted for a long time. During this time, inconveniences such as the spare seedling pine on the stand for seedlings falling off or the load collapsing occur.
Moreover, in the prior art, when the seedling planting device is moved up and down with respect to the machine body, the relative positional relationship between the seedling platform in the seedling planting device and the spare seedling stand on the machine body side shifts, so the seedling planting device In order to supply the seedling pine on the spare seedling stand to the side seedling stand, the seedling planting device must be moved up and down to a certain position, which also has the drawback of making the seedling transfer operation troublesome.

In this way, when transferring the spare seedling pine on the stand for seedlings to the stand for seedlings, the movement of the stand is controlled by the link mechanism, after it is raised in a horizontal state. By using a two-stage motion that tilts in the same direction as the seedling platform, and after seedling transfer is completed, the preliminary seedling platform is returned to horizontal position and then lowered while remaining horizontal, and the preliminary seedling platform is provided on the side of the seedling planting device. , which eliminates the above-mentioned drawbacks.

Hereinafter, an embodiment of the drawings will be described. In the drawings, reference numeral 1 indicates a fuselage having a pair of left and right front wheels 2 and a pair of left and right rear wheels 3, and an engine 4 and a control handle 5 are mounted on the upper front surface of the aircraft. The upper surface of each section is equipped with a control seat 6, and the output shaft 7 of the engine 4 is provided.
The power is transmitted from the transmission case 9 to the transmission case 8 on the fuselage 1 via a belt 9, and from the transmission case 9 to the front wheel 2.
The output shaft 7 of the engine 4 is equipped with a main engine which is configured to cut off power transmission to the transmission case 8 by depressing a clutch pedal 10. The clutch pedal 10 is equipped with a hydraulic cylinder 12 with a spring 13 for disengaging the main clutch 11 by hydraulic pressure. It is equipped with a hydraulic pump 16 that is driven by a belt 15.

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;
It consists of a float 20 attached to the lower surface and a seedling stand 21 whose upper end is inclined so as to approach the machine body, and the lower end of the seedling stand 21 is fitted into a seedling retrieval guide rail 22 attached to the upper surface of the transmission case 19. A trochanter 25 at the upper end of an arm 24 erected from the transmission case 19 is fitted onto a rail 23 provided midway on the back surface of the arm 24 so as to reciprocate in the left-right and lateral directions. This seedling planting device 17 consists of a pair of upper and lower links of equal length, which 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 fuselage 1, respectively. A pair of left and right vertical parallel link mechanisms 34 and 29 consisting of 28 and 29 are connected to the fuselage 1 so that they can 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 to the seedling planting device 17 from the transmission case 8 on the body 1 via a not-shown flexible shaft or the like.

Reference numeral 36 denotes a support stand 3 provided on the rear upper surface of the aircraft body 1.
A spare seedling stand placed on 7, 38 is the spare seedling stand 36
A lifting and lowering slope is shown, which is located below the holder and lifts up the preliminary seedling stand 36. On the upper part of the support 26 at the front end of the seedling planting device 17, a pin 41 is attached to the base end, respectively. 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 which are pivotally connected to each other, and the lifting and lowering slope table 38 is rotatably mounted at the tip of the upper link 39 in the parallel link mechanism 43. A pin 44 is pivotally attached, and a hydraulic cylinder 45 for raising and lowering a preliminary seedling stand is installed between the pin 44 and the machine body 1, and a pin 46 provided at the tip of the lower link 40 is attached to the machine body 1.
7 is placed on the stopper part 27' at the upper end,
A tilting hydraulic cylinder 47 is installed between the pin 46 and the lifting/lowering ramp 38.

The parallel link mechanism 43 for raising and lowering the preliminary seedling table has a quadrilateral shape that is congruent with the parallel link mechanism 34 for raising and lowering the seedling planting device 17, 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 when it comes into contact with the upper and lower links 39 and 40, and the upper end of the link 49, which is pivoted by a pin between the upper and lower links 39 and 40, is provided with an upward and downward slope. When the table 38 is tilted, an adjustable screw-type tilt stopper 50 is provided at a position close to the seedling mounting table 17 of the seedling planting device 17 to restrict the tilting movement.

Reference numeral 51 indicates a switching valve for performing seedling succession work, and reference numeral 52 indicates an elevation switching valve for raising and lowering the seedling planting device 17. The switching valve 51 for seedling succession operation operates to raise and lower the circuit 53 from the hydraulic pump 16 in the normal state. A circuit 54 to the switching valve 52 is connected, and a circuit 55 from the lifting switching valve 51 is connected to a circuit 56 to the lifting hydraulic cylinder 35.
A circuit 57 to the hydraulic cylinder 12 of No. 0 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. 53
circuit 54 from to the switching valve 52 and the hydraulic cylinder 3
The hydraulic pump 16 is configured to disconnect the circuit 56 to the circuit 5 and connect the hydraulic pump 16 to the circuits 57 and 58.
The lift switching valve 52 is mounted near the pilot seat 6 and has a lever 52' at a neutral position where hydraulic pressure is cut off from and into the lift hydraulic cylinder 35, and a neutral position where hydraulic pressure from the hydraulic pump 16 is sent to the hydraulic cylinder 35. The hydraulic cylinder 35 is configured to be able to switch between three positions: a lifting device that moves, and a lowering position that releases the hydraulic pressure of the hydraulic cylinder 35 into the oil tank.

Furthermore, the hydraulic cylinder 45 for lifting and lowering the preliminary seedling stand and the hydraulic cylinder 47 for tilting are the hydraulic cylinder 4 for lifting and lowering.
5 actuates first, and the stopper 48 of the upper link 39 in the parallel link mechanism 43 moves to the lower link 40.
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 is activated after contact with the lifting hydraulic cylinder 45 from the hydraulic circuit 58.
A delay mechanism consisting of a check valve 60 and a throttle 61 arranged in parallel is provided 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. It is.

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. Lifting stops at the raised position. During rice planting work, while feeding seedling mats onto the seedling platform 21, spare seedling mats are 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 the field 62, and in this state, by moving the body 1 forward and driving the seedling planting device 17, the seedling platform 21
The upper seedling pine 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 transplanting work, when the number of seedling pine on the seedling stand 21 becomes less or disappears, seedling transfer is performed in which the spare seedling pine on the preliminary seedling stand 36 is transferred to 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 return oil from the hydraulic cylinder 35 to the oil tank are cut off, so that from now on, regardless of the switching valve 52, it will not go up or down 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 clutch pedal 10, and the hydraulic cylinder 12 is activated, rotating the clutch pedal 10 in the same direction as the foot pedal and turning the main clutch 11.
Since it is turned off, 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 applied to the hydraulic cylinders 45 and 45 for lifting and tilting the preliminary seedling stand.
Sent to 47. In this case, the lifting hydraulic cylinder 4
5 is larger than the diameter of the tilting hydraulic cylinder 47, and the lifting hydraulic cylinder 45 operates with a lower hydraulic pressure than the tilting hydraulic cylinder 47, so the lifting hydraulic cylinder 45 operates to protrude first. The lifting/lowering slope 38 rises in a horizontal state, lifts the preliminary seedling stand 36 in a horizontal state in the middle of its rise, and rises until the stopper 48 of the upper link 39 comes into contact with the lower link 40. Next, the tilting hydraulic cylinder 47 is operated to protrude and lift the tilting table 38.
moves tilting until it touches the tilt stopper 50, and the preliminary seedling stand 36 on the upper surface approaches the seedling stand 21 and tilts in the same direction as the seedling stand 21, so that the spare seedling stand 36 on the preliminary seedling stand 36 is The seedlings can be moved onto the seedling stand 21 by being slightly stretched, and seedling succession is performed.

When this seedling succession is completed, the switching valve 51 for seedling succession work is
By operating it to its original position, the hydraulic pressure of the hydraulic cylinder 12 in the clutch petal 10 is released and the main clutch 11 is turned on, and at the same time the seedling planting device 17 is driven, the machine 1 starts moving forward and rice planting work is resumed. On the other hand, a circuit 58 to the hydraulic cylinders 45 and 47 for lifting and tilting the preliminary seedling stand is opened to the oil tank. In this case, since the circuit 59 to the lifting hydraulic cylinder 45 is provided with a delay mechanism consisting of a check valve 60 and a throttle 61 for the return oil from the hydraulic cylinder 45, the tilting hydraulic cylinder 47 is first The retracting motion returns the preliminary seedling stand 38 to a substantially horizontal position, and then the lifting hydraulic cylinder 45 retracts, lowering the preliminary seedling stand 38 in a horizontal state and placing it on the supporting frame 37 of the machine body 1. Then, the seedling succession work is completed.

In addition, the elevating and descending slope 3 for the preliminary seedling stand 36 is
By pivoting the base end of the parallel link mechanism 43 to which 8 is attached to the seedling planting device 17 side, the base end of the parallel link mechanism 43 moves up and down together with the seedling planting device 17. No matter what height position the seedling planting device 17 is at, the elevating and lowering slope table 38 can be aligned with the upper end of the seedling platform 21 in the seedling planting device 17.

As described above, the present invention provides a seedling-planting device that is connected to a machine body having running wheels so as to be able to rise and fall vertically, and a seedling-planting stand that is inclined so that its upper part approaches the machine body, while the base end is connected to the seedling-planting device. A parallel link mechanism consisting of a pair of upper and lower links rotatably connected to the device is disposed such that the tip of the parallel link mechanism extends toward the body, and a spare seedling stand is provided at the tip of the parallel link mechanism. , the spare seedling stand is tiltably mounted so that it can be tilted in the same direction as the seedling stand, the parallel link mechanism is provided with a lifting hydraulic cylinder for raising and lowering the spare seedling stand, and the parallel link mechanism and the spare Between the seedling stand and the raising/lowering hydraulic cylinder, the preliminary seedling stand is moved up and down, the preliminary seedling stand is then tilted, and the lifting hydraulic cylinder is moved horizontally to move the spare seedling stand prior to the lowering movement of the stand. This system is equipped with a tilting hydraulic cylinder so that the seedling stand located on the side of the aircraft is raised from below by a parallel link mechanism, so the spare seedling stand can be installed at a location lower than the top of the seedling stand. As a result, the center of gravity of the machine body does not become high and the running stability of the rice transplanter can be improved, and the operator's field of view is less likely to be obstructed by the spare seedling stand, which improves the field of view. During the seedling transfer process, the preliminary seedling stand is first raised horizontally, then tilted in the same direction as the seedling stand, and after the seedling transfer process, the preliminary seedling stand is returned to the horizontal position and then lowered. The time that the preliminary seedling stand is tilted inside is shorter than when seedlings are transferred only by tilting the preliminary seedling stand, as in the past.
When the preliminary seedling table is tilted, the frequency of the spare seedling pine on the preliminary seedling table accidentally falling off or the load collapsing is significantly reduced, and seedling succession work can be carried out easily and safely. Moreover, according to the present invention,
No matter what kind of lifting device the seedling planting device is, the spare seedling stand can be reliably aligned with the top of the seedling stand, so there is no need to move the seedling planting device up and down when transferring seedlings to the seedling stand. It also has the effect of allowing seedling succession work to be done extremely easily and quickly without any problems.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view of the rice transplanter, Fig. 2 is a plan view of the rear of the rice transplanter, and Fig. 3 is a side view of the rice transplanter.
The figure is a diagram showing a hydraulic circuit. 1... Airframe, 2... Front wheel, 3... Rear wheel, 1
7... Seedling planting device, 21... Seedling stand, 34... Link mechanism, 36... Spare seedling stand, 38... Lifting slope, 43... Link mechanism, 45... Hydraulic cylinder for lifting, 47... ...Hydraulic cylinder for tilting.

Claims (1)

[Scope of utility model registration request] A seedling planting device connected to a body having running wheels so as to be able to rise and fall up and down is provided with a seedling platform whose upper part is inclined toward the body, and a base end thereof is rotatably pivoted to the seedling planting device. A parallel link mechanism consisting of a pair of upper and lower links is arranged such that the tip of the parallel link mechanism extends toward the body side, and a spare seedling stand is provided at the tip of the parallel link mechanism, and the spare seedling stand is connected to the The parallel link mechanism is provided with a lifting hydraulic cylinder for raising and lowering the spare seedling stand, and a hydraulic cylinder is provided between the parallel link mechanism and the spare seedling stand. , a tilting hydraulic pressure for tilting the preliminary seedling stand following the upward movement of the preliminary seedling stand by the lifting hydraulic cylinder, and for horizontally moving the preliminary seedling stand prior to the downward movement of the preliminary seedling stand by the lifting hydraulic cylinder; A rice transplanter's seedling splicing device equipped with a cylinder.