JPH0223126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a riding type rice transplanter in which a seedling planting device consisting of a float, a seedling stand, a seedling planting mechanism, etc. is provided so as to be movable up and down with respect to a traveling machine body. In detail, when the seedling planting device is attached to the traveling machine so that it can move up and down via the lower link and top link, even if the traveling machine pitches,
By keeping the relationship of the seedling planting device to the field constant, the seedlings can always be planted correctly in a constant planting posture.

In other words, when the seedling planting device is attached to the traveling machine body via the lower link and top link, when the traveling machine pitches according to the unevenness of the tiller, the seedling planting device also pitches in conjunction with this, and the field conditions change. The positional relationship between the float in contact with the seedling planting mechanism changes, and the planting state of the seedlings changes, resulting in missing plants and floating seedlings. By expanding and contracting the top link, the positional relationship between the float and the seedling planting mechanism is maintained constant.

Next, an explanation will be given of an embodiment drawing in which the present invention is applied to a four-row riding type rice transplanter. This figure shows a machine body connected in a horizontally bendable manner, and two wheels 8, 8, 9, 9 are attached to the left and right sides of both bodies 2, 3 via swing arms 6, 6, 7, 7, respectively. .

The engine 10 mounted on the rear fuselage 3 is connected to the rear wheels 9,
9 and transmits power to a transmission (not shown) in the front body 2 through an intermediate shaft 11 provided in the vertical shaft 5 to drive the front wheels 8, 8 in the direction of arrow a. On the other hand, when the handle 13 attached to the handle base 12 of the front body 2 is operated, the vertical shaft 5 is rotated via a chain etc. in the transmission case 14, and both bodies 2, 3 are rotated. It is configured to perform steering by adjusting the bending of the steering wheel.

15 is a seedling planting device located in front of the front body 2, and the planting device 15 includes a mission case 17 to which power is transmitted from the mission in the front body 2 via a flexible shaft 16; A seedling stand 18 attached to the case 17; a seedling planting mechanism 19; and a float 21 rotatably attached to the case 17 via a pin 20.
The rear end of the transmission case 17 is vertically movably connected to the front body 2 by a top link 22 and a lower link 23.

The top link 22 is configured to be extendable and retractable by a hydraulic cylinder 24 and a piston 25, and the hydraulic cylinder 24 receives hydraulic pressure from a hydraulic pump 26 to advance and
An electromagnetic switching valve 27 for switching between three stages, neutral and reverse, is attached. In addition, a non-bendable letter-shaped link 29 is attached to the arm 28 protruding from the mission case 17 and the tip of the float 21 with a pin 30.
31 are fastened and connected to each other, and the pin 30 of the arm 28
A mounting piece 34 with two limit switches 32 and 33 facing each other is suspended from the pin 31 of the float 21.
An actuating piece 35 is provided between the actuating piece 33 and the actuating piece 35.
5 contacts the upper switch 32, the switching valve 2
When one solenoid 36 at 7 is activated, the top link 22 is shortened, and the actuating piece 35 contacts the lower switch 33, the other solenoid 37 is activated.
The top link 22 is configured to extend when the top link 22 is activated.

Note that reference numeral 38 is a lifting arm connected to the lower link 23, and the arm 38 is connected to the handle lever 39.
The seedling planting device 15 is raised and lowered by the operation of a lifting cylinder 41 operated by a switching valve 40.

In this configuration, an operator gets on the seat 4, lowers the seedling planting device 15 by operating the lift switching valve 40 until the float 21 touches the field surface 42, and moves forward while sliding on the field surface. Then, after the field is leveled with the float 21, the seedlings are planted one by one on the seedling platform 18 by the seedling planting mechanism 19. Since it is connected to the body 1 at 23 and can freely move up and down regardless of the vertical movement of the body 1, the float 21 can glide while always being in contact with the field 42.

Then, the tiller 43 on which the front wheels 8, 8 and rear wheels 9, 9 of the aircraft body 1 touch the ground is uneven, and the aircraft body 1
As shown in the figure, by pitching so that the front part lifts up or the rear part goes down, the seedling planting device 1 connected to this body 1 with a top link 22 and a lower link 23
The transmission case 17 of No. 5 is also tilted toward the machine body as shown by the two-dot chain line together with the seedling planting mechanism 19 and the seedling platform 18, and the positional relationship between the seedling planting mechanism 19 and the field scene 42 where the float 21 touches the ground is Although this will vary, in the present invention, the top link 22 is configured to be extendable and retractable by a hydraulic cylinder 24 and a piston 25, while a mechanism for operating the hydraulic cylinder 24 is provided between the float 21 and the transmission case 17. Therefore, by pitching the machine body 1 so that its front part is lifted, the mission case 17 and the seedling planting mechanism 19 are tilted as shown by the two-dot chain line, and the mission case 17 and the seedling planting mechanism 19 are tilted as shown by the two-dot chain line. float 21
The doglegged link 29 connecting the
1 becomes wider to H', the actuating piece 35 comes into contact with the lower switch 33, the switching valve 27 is switched in the forward direction of the piston 25 via the solenoid 37, and the top link 22 becomes longer. The transmission case 17 and the seedling planting mechanism 19 are pushed back forward until the lower switch is turned off, and are corrected to the correct state with respect to the field scene 42 as shown by the solid line, and the machine body 1 is If pitched so that the front part goes down or the rear part goes up,
As the pitching of this aircraft increases, the dogleg-shaped link 29
By narrowing the interval H between the pins 30 and 31 at both ends, the actuating piece 35 comes into contact with the upper switch 32,
The switching valve 27 is connected to the piston 2 via the solenoid 36.
5, and the top link 22 becomes shorter, so the transmission case 17 and the seedling planting mechanism 19 are pulled back toward the machine body until the upper switch 32 is turned off, and are corrected to the correct state for the field scene. It will be done.

In the above embodiment, the top link 22 is made telescopic using the hydraulic cylinder 24 and the piston 25, and the switching valve 27 is used to operate the top link 22. However, the top link is not limited to this. It goes without saying that other mechanisms for expanding and contracting may be used in combination with the above.

In summary, the present invention enables a seedling planting device consisting of a transmission case, a seedling planting mechanism attached to the case, a seedling stand, and a float to be movable up and down on a traveling machine via a top link and a lower link. When installing the top link, the top link is configured to be expandable and contractible, and the top link is provided with a mechanism that expands and contracts according to the distance between the seedling planting device and the float. This is because the float of the device can always glide while being in contact with the field regardless of the vertical movement of the traveling machine, and the positional relationship between the field and the seedling planting mechanism can be kept almost constant with respect to pitching of the machine. , seedling planting is stable,
The plant can be planted correctly under a certain planting posture, and has the effect of preventing the occurrence of missing plants, floating seedlings, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a riding-type rice transplanter, FIG. 2 is a side view showing the operating state, and FIG. 3 is a circuit diagram. DESCRIPTION OF SYMBOLS 1... Aircraft, 15... Seedling planting device, 17... Mission case, 19... Seedling planting mechanism, 18... Seedling mounting stand, 2
1...Float, 22...Top link, 23...Lower link.

Claims (1)

[Claims] 1. When installing a seedling planting device consisting of a transmission case, a seedling planting mechanism attached to the case, a seedling stand, and a float on the traveling machine so as to be movable up and down via a top link and a lower link, the above-mentioned A riding-type rice transplanter characterized in that the top link is configured to be extendable and contractible, and the top link is provided with a mechanism that extends and contracts in accordance with the distance between the transmission case and the float of the seedling planting device.