JPS6018019Y2 - Lifting device for seedling planting device in riding rice transplanter - Google Patents

Description

[Detailed description of the invention] The present invention is a so-called riding-type rice transplanter in which a worker rides on the machine and performs rice transplanting work. This relates to a lifting device for lifting and lowering from the aircraft body side.

Conventional rice transplanters were generally operated by a worker while walking along with the rice transplanter, but if the worker were to sit on the machine and operate it, worker fatigue would be reduced. However, in order to properly and reliably plant seedlings in the field with this type of riding-type rice transplanter and to improve work efficiency, it is necessary to constantly operate the seedling planting device regardless of the vertical movement of the machine. In addition to stably sliding on the field in a substantially constant posture and in contact with the ground with a substantially constant ground pressure, the seedling planting device can be freely changed to the direction of the rice transplanter on the road or at the edge of the field. Must be able to go up and down.

In the present invention, a seedling planting device is attached to a traveling machine body via a lower link and a top link so as to be movable up and down, and
When the seedling planting device is raised and lowered by the swinging rotation of the lifting arm attached to the traveling body, a hydraulic cylinder is provided between the lifting arm and the lower link or the seedling planting device, and the hydraulic pressure acting on the hydraulic cylinder is controlled as described above. By relating to the expansion and contraction of the top link, the ground contact pressure and posture relative to the field are maintained approximately constant.

Next, we will explain the embodiment drawings in which one example of the present invention is applied to a front-planting type riding-type rice transplanter. Brackets 5 and 4' protruding above and below the front end of the rear fuselage 3 are each pivoted on the same vertical line by a pin 6.7, thereby showing a traveling fuselage configured to be horizontally bendable.
, 3, there are wheels 11.11 and 12.12 on the left and right sides of the swing arm 13, to which power is transmitted from the engine 8 mounted on the rear fuselage 3 via bendable shafts 9, 10 mounted between the two bodies. , 13, 14, and 14 so as to be vertically movable, and a hydraulic pump 15 driven by the engine 8 is provided on the upper surface of the rear fuselage 3.

Furthermore, by rotating the handle 19 in front of the seat 17 attached to the gate-shaped frame 16 erected from the front body 2, the traveling body 1 can be rotated through the steering gear box 20, the pitman arm 21, and the rod 22. The aircraft is configured to be steered by adjusting the direction and degree of bending of the aircraft bodies 2 and 3.

23 is a pair of lower links 2 in front of the front fuselage 2.
4 and one top link mechanism 25 to be able to move up and down.
Three seedling planting units 29 each having seedling planting claws 27, 27 and a float 28 attached to the respective conductive cases 26 are connected by tubular members 30 and 30. 26, 26. A guide rail 31 having a rectangular cross section is installed horizontally on the upper surface of the 26, and this guide rail 3
1 is provided with a seedling stand 32, and an input shaft 33 of this seedling planting device 23 has a gate temperature shaft 3 which is rotationally driven by an engine 8.
Power is transmitted via a telescoping shaft 35 connecting between the two.

On the front surface of the front fuselage 2, an elevating shaft 38 that rotates by the movement of a piston 37 of a single-acting hydraulic cylinder 36 installed in the front fuselage 2 is supported, and the elevating shaft 38 projects forward from both ends of the elevating shaft 38. The tips of the pair of left and right lifting arms 39.39 are connected to the pair of left and right lower links 24 by hydraulic cylinders 40 and 40, respectively.
By connecting the seedling planting device 23 via the hydraulic cylinder 36, the seedling planting device 23 is raised and lowered by the operation of the hydraulic cylinder 36.

A switching valve 41 is provided in a hydraulic circuit 42 extending from the hydraulic pump 15 to the hydraulic cylinder 36 at an appropriate location such as on the side of the seat 17.

This switching valve 41 is operated in three stages by operating the bundle lever 43: a raised position that sends hydraulic pressure to the hydraulic cylinder 36, a lowered position that releases the hydraulic pressure of the hydraulic cylinder 36, and a neutral position that cuts the hydraulic pressure in and out of the hydraulic cylinder 36. It is now possible to switch to

Further, as shown in FIG. 4, the top link mechanism 25 slides a rod 25' pivotally mounted on the seedling planting device 23 side into a capsule tube 25'' pivotally mounted on the front body 2 side. The rod 25' is configured to be freely inserted and retractable, and the rod 25' is biased in the direction of contraction into the casing 25'' by a spring 44, while a relief valve consisting of a valve body 46 and a spring 47 is provided inside the casing 25''. 45,
The support valve 48 of the spring 47 is brought into contact with the tip of the rod 25', so that the opening pressure of the valve body 46 in the relief valve 45 decreases in proportion to the elongation of the rod 25'. .

Then, this relief valve 45 is inserted into a private lodging circuit 47 extending from the switching valve 41 to the oil tank 46, while both hydraulic cylinders 40. 40 are connected to each other by a hydraulic passage 48, and the hydraulic passage 48 is connected to the private lodging circuit 47 via a circuit 49.

In this configuration, the switching valve 41 is connected to its band lever 43.
When the seedling planting device 23 is switched to the lowered position by the operation, the oil in the hydraulic cylinder 36 is released, and the seedling planting device 23 descends until each float 28 touches the field, and in this state, the traveling body 1 moves forward. By driving the seedling planting device 23, a predetermined rice planting operation is carried out, and when turning at the edge of a ridge or driving on the road, the switching valve 41 is switched to the raised position by the bundle lever 43. Since the hydraulic pressure from the hydraulic pump 15 is sent to the hydraulic cylinder 36, the seedling planting device 23 rises, and when it rises to a predetermined height, the switching valve 41 is set to the neutral position by the bundle lever 43, and the hydraulic pressure is increased. Since the hydraulic pressure in and out of the cylinder 36 is cut off, the seedling planting device 23 can be maintained in an elevated or lowered state at an arbitrary height position.

Then, the rice planting work is carried out with the switching valve 41 in the lowered position, and at this time, the hydraulic pressure from the hydraulic pump 15 is returned to the oil tank 46 via the private lodging circuit 47.

The vacation rental circuit 47 is provided with a relief valve 45 whose set pressure changes as the top link mechanism 25 expands and contracts. 40
．． 40 to bias the lower links 24, 24 and, in turn, the seedling planting device 23 in the lifting direction.

In this case, if the seedling planting device 23 is tilted forward due to unevenness in the field where the float of the seedling planting device 23 touches the ground, an external force acts on the top link mechanism 25 in the direction of stretching it, and the rod 25' protrudes and the relief valve 45
The spring 47 at is weakened, and the set pressure of the relief valve 45 and the hydraulic pressure acting on both hydraulic cylinders 40 and 40 are reduced, so the force in the lifting direction of the seedling planting device is weakened, causing the seedling planting device to lean forward. The inclination will be corrected, and if the seedling planting device is tilted forward, both hydraulic cylinders 4 will be
The hydraulic pressure acting on 0.40 becomes higher, and the force in the lifting direction of the seedling planting device increases, correcting the inclination of the seedling planting device, and also has the same effect on the vertical movement of the traveling machine. Therefore, the attitude of the seedling planting device relative to the field and the ground pressure can be automatically controlled to be approximately constant.

Therefore, according to the present invention, the seedling planting device, which is attached to the traveling machine so as to be able to move up and down, can be raised and lowered from the traveling machine at will, while at the same time, the seedling planting device is always maintained in a substantially constant posture with respect to the field during rice planting work. Because the ground pressure can be automatically controlled,
The rice planting work can be done correctly in a fixed posture without causing the seedlings to be planted shallowly or deeply due to the unevenness of the field and the plowing platform.Moreover, the present invention allows the above-mentioned control to be applied to the seedlings with respect to the traveling machine. This is done at the link mechanism where the implantation device is attached, and because it is done by the vertical movement of the traveling machine, it has the advantage of a simple structure.

Note that the present invention is not limited to the front planting method of the embodiment, but is also applicable to a rear planting method in which a seedling planting device is installed at the rear of the traveling machine and a mid-planting method in which a seedling planting device is installed in the middle of the traveling machine. Needless to say, the hydraulic cylinders 40, 40 may be provided between the lifting arms 39, 39 and the seedling planting device 23.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a perspective view of the lifting device, and Fig. 4 is a top link mechanism. FIG. 1... Traveling mechanism, 23... Seedling planting device,
24...Lower link, 25...Top link mechanism, 15...Hydraulic pump, 36...
...Hydraulic cylinder, 41...Switching valve, 39
... Lifting arm, 47 ... Private lodging circuit,
40...Hydraulic cylinder, 45...Relief valve.

Claims (1)

[Scope of utility model registration request] In a riding type rice transplanter in which a seedling planting device is attached to a traveling machine body via a lower link and a top link, the traveling machine body is provided with a lifting arm that swings and rotates with a lifting hydraulic cylinder equipped with a switching valve. While the lifting arm and the lower link or the seedling planting device are connected by a hydraulic cylinder, the top link is provided with a relief valve whose set pressure changes by expansion and contraction, and the IJ IJ-F valve is connected to the private lodging circuit from the switching valve. An elevating device for a seedling planting device in a riding type rice transplanter, comprising a private lodging circuit inserted therein and connected to a hydraulic cylinder between the elevating arm and the lower link or the seedling planting device.