JPS6237925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a riding-type rice transplanter in which a worker rides on a traveling machine and performs rice planting work, and the ground pressure of the float on the field surface of the seedling planting device is adjusted to
The present invention relates to a device for automatically adjusting the temperature to maintain a substantially constant value.

Conventional rice transplanters were generally operated by a worker while walking along with the rice transplanter.
It is very preferable for a worker to board and operate a traveling machine equipped with a seedling planting device, since this reduces worker fatigue.

However, in such a riding-type rice transplanter with a seedling planting device attached to the traveling body, in order to ensure that the seedlings are planted in the field in the correct condition, it is necessary to increase the ground pressure of the float of the seedling planting device against the field. It is necessary to hold it approximately constant. In other words, the traveling aircraft is
When the wheels of the traveling machine pitch downward or upward due to the unevenness of the tiller that is in contact with the ground, the seedling planting device attached to the traveling machine also pitches, and the ground pressure of the float of the seedling planting device against the field surface decreases. Because of this change, seedlings may be planted deep or shallow in relation to the field.

In the present invention, when a seedling planting device is mounted on a traveling machine so as to be movable up and down by a top link at the upper part and a lower link at the lower part, the top link is moved in the longitudinal direction of the traveling machine with respect to the traveling machine. If configured to be movable, the top link will move back and forth to approach or move away from the traveling machine due to pitching of the traveling machine, and the seedling planting device will utilize the back and forth movement of the top link By raising and lowering the float, the ground pressure of the float of the seedling planting device relative to the field can be automatically adjusted to maintain a substantially constant ground pressure.

Therefore, in the present invention, a seedling planting device having a float, a seedling stand, and a planting mechanism is mounted on a traveling body supported by front wheels and rear wheels, and is movable up and down by an upper top link and a lower lower link. In a riding type rice transplanter, the top link is attached to the traveling machine body, and a lifting mechanism with a hydraulic cylinder for raising and lowering the seedling planting device is provided on the traveling machine body. The top link is constructed such that it can freely move in the longitudinal direction of the traveling body, while a hydraulic pressure supply path to the hydraulic cylinder in the lifting mechanism is provided with a link that is connected to the top link in relation to the longitudinal movement of the traveling body. The structure includes a hydraulic switching valve that switches the hydraulic cylinder to raise or lower the seedling planting device.

The drawings in which the embodiment of the present invention is applied to a six-row riding rice transplanter will be explained below. The front fuselage 2 and the rear fuselage 3 in No. 1 have brackets 4 and 5 that protrude above and below the rear end of the front fuselage 2, and brackets 4' and 5' that protrude above and below the front end of the rear fuselage, respectively. The front body 2 is provided with an axle case 8 extending in the left-right direction, and an axle case 8 is provided at both ends of the axle case 8. The front wheels 12 are respectively attached via the swing case 10. Further, the rear body 3 is also provided with an axle case 9 extending in the left-right direction, and rear wheels 13 are attached to both ends of the axle case 9 via swing cases 11, respectively. In addition, the swing case 10 of the front wheel 12
A buffer mechanism (not shown) is provided between the rear wheel 13 and the front body 2, and a buffer mechanism such as a leaf spring 14 is also provided between the swing case 11 of the rear wheel 13 and the rear body 3. There is.

Furthermore, the traveling body 1 uses the power of the engine 21 mounted on the rear body 3 to both the front and rear bodies 2, 3.
The vehicle travels forward by transmitting power to the front wheels 12 and rear wheels 13 via bendable shafts 22 and 23 installed between them and transmission mechanisms (not shown) in both the front and rear bodies 2 and 3, In addition, by rotating the handle 26 provided at the front of the seat 25 attached to the gate-shaped frame 25 erected from the front body 2, both the front and rear bodies 2, 3 are bent in the horizontal direction. Further, a PTO shaft 30 is provided on the front surface of the front fuselage 2 to which the engine 21 transmits power.

Reference numeral 31 in the figure indicates a seedling planting device disposed in front of the traveling body 1, and the seedling planting device 31 includes a transmission case 34, a pair of left and right planting mechanisms 35, and a float 3.
6 are arranged side by side, and the transmission cases 34 are connected by a tubular member 39, and the upper surface of each transmission case 34 has an L-shaped cross section. A guide rail 40 is mounted in the horizontal direction, a seedling platform 14 is provided on the guide rail 40 so as to be movable laterally, and the seedling planting device 31
Power is transmitted to the input shaft 42 from the PTO shaft 30 in the front body 2 via a telescoping and retractable shaft 43.

The seedling planting device 31 is vertically movably connected to the front body 2 of the traveling body 1 by a pair of left and right lower links 32 at the bottom and one top link mechanism 33 at the top. A lateral vibration prevention means such as a tension spring 44 is installed between the lower link 32 and the front body 2.

Further, a pair of left and right lifting arms 46 are provided on the front body 2 so as to be movable up and down, and long grooves at the lower ends of both connecting rods 47 pivotally connected to the tips of the lifting arms 46 are connected to the lower links 32. A tension spring 48 is installed between both lower links 32 and both lifting arms 46 while engaging with a pin planted on the side, and furthermore, both lifting arms 46 are rotated by a hydraulic cylinder 51. Accordingly, the seedling planting device 31 is configured to move up and down significantly.

As shown in FIG. 3, the top link mechanism 33 is composed of a top link 33' pivotally connected to the seedling planting device 31 side and a cylinder 33'' pivotally connected to the front body 2 side. The link 33' is slidably inserted into the cylinder 33'' so that the pivoting portion between the top link 33' and the seedling planting device 31 can freely move in the longitudinal direction of the traveling body 1. Furthermore, inside the cylinder 33'', there is a compression spring 52 that biases the top link 33' in the direction of drawing it into the cylinder 33'', and a compression spring 52 that biases the top link 33' in the direction of protruding from the cylinder 33''. The compression springs 53 are provided so as to maintain balance with each other.

Reference numeral 45 in the figure indicates a hydraulic switching valve disposed in the hydraulic pressure supply passage from the hydraulic pump 49 to the hydraulic cylinder 51, and the hydraulic switching valve 45 is attached to the cylinder 33'' of the top link mechanism 33, By connecting the spool of the hydraulic switching valve 45 to the top link 33' of the top link mechanism 33, the top link 3
3' moves closer to the traveling body 1, the hydraulic switching valve 45 switches to send hydraulic pressure to the hydraulic cylinder 51, and when the top link 33' moves away from the traveling body 1, the hydraulic switching valve 45 switches to send hydraulic pressure to the hydraulic cylinder 51. It is configured to switch so as to release the hydraulic pressure in 51.

Note that the reference numeral 50 in the figure indicates the hydraulic cylinder 51.
The seedling planting device 31 has priority over the hydraulic switching valve 45.
This is a manual operation part for raising or lowering the

In this configuration, when the seedling planting device 31 is lowered so that each float 36 touches the field and the traveling body 1 travels forward, the field is leveled by each float 36 and then the planting mechanism 35 Seedlings are planted one by one from the seedling pine on the seedling stand 41.

During this rice planting work, if the traveling machine body 1 pitches in such a way that the front wheels 12 enter a depression in the tiller, or the rear wheels 13 ride on a raised part of the tiller, causing the vehicle to tilt forward. The seedling planting device 3 is lowered by lowering the lower link 32 due to this downward pitching.
1, the ground pressure of the float 36 against the field increases, and the planting depth of the seedlings relative to the field becomes deeper. However, when the traveling body 1 pitches forward downward as described above, the top link mechanism 33 is extendable and retractable by the top link 33' and the cylinder 33'', so that the pivot point of the top link 33' to the seedling planting device 31 side, and the pivot point of the cylinder 33'' to the traveling body 1 side. and move closer to each other and the top link 33' moves closer to the traveling machine body 1, the hydraulic switching valve 45 is switched to send hydraulic pressure to the hydraulic cylinder 51, and the hydraulic cylinder 51 switches the seedling planting device 31. Since the vehicle moves upward, the ground pressure that has increased due to the downward pitching of the traveling body 1 is automatically returned to its original value.

In addition, when the traveling body 1 pitches forward during rice planting work, such that the front wheels 12 ride on a raised part of the tiller, or the rear wheels 13 enter a depression in the tiller, causing the vehicle to pitch forward. The seedling planting device 3 is raised by raising the lower link 32 by this forward pitching.
1, the ground pressure of the float 36 against the field surface decreases, and the planting depth of the seedlings relative to the field surface becomes shallower. However, if the traveling body 1 pitches upward as described above, the top link 3
3' to the seedling planting device 31 side and the cylinder 3
3'' to the traveling body 1 side move away from each other, and the top link 33' moves away from the traveling body 1, so that the hydraulic switching valve 45
Since the oil pressure in the hydraulic cylinder 51 is switched to release the oil pressure and the seedling planting device 31 moves downward, the ground pressure that has decreased due to the forward pitching of the traveling body 1 is automatically returned to its original value. be.

As described above, the present invention provides a riding type rice transplanter in which a seedling planting device is attached to a traveling body through a top link at the upper part and a lower link at the bottom, in which the ground pressure of the float of the seedling planting device against the field surface of the traveling body is When the ground pressure fluctuates due to pitching, this fluctuation is sensed by the back and forth movement of the top link relative to the traveling machine body, and the ground pressure is automatically returned to its original value by raising or lowering the seedling planting device. Therefore, it is possible to reduce fluctuations in the ground pressure of the float due to pitching of the traveling body. In other words, the ground pressure of the float to the field can be kept approximately constant with respect to pitching of the traveling body, and It has the effect of stabilizing the planting depth of seedlings.

[Brief explanation of the drawing]

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, and Fig. 3 is a side view of a riding rice transplanter.
The figure is an enlarged sectional view of the top link mechanism, and FIG. 4 is a diagram showing the hydraulic circuit. 1... Traveling body, 31... Seedling planting device, 32...
Lower link, 33...Top link mechanism, 3
3'... Top link, 46... Lifting arm, 5
1...Hydraulic cylinder, 49...Hydraulic pump, 45
...Hydraulic switching valve.

Claims (1)

[Claims] 1 A traveling aircraft supported by front wheels and rear wheels,
A seedling planting device having a float, a seedling stand, and a planting mechanism is mounted so as to be movable up and down by a top link at the upper part and a lower link at the bottom, and a hydraulic pressure is provided for raising and lowering the seedling planting device on the traveling body. In a riding type rice transplanter equipped with a cylinder-equipped lifting mechanism, the top link is configured such that a pivoting portion between the top link and the seedling planting device can freely move in the longitudinal direction of the traveling machine with respect to the traveling machine. On the other hand, in the hydraulic pressure supply passage to the hydraulic cylinder in the lifting mechanism, there is provided a hydraulic switching valve configured to switch the hydraulic cylinder to raise or lower the seedling planting device in relation to the back and forth movement of the top link with respect to the traveling machine body. A float ground pressure adjustment device for a seedling planting device in a riding type rice transplanter, characterized in that: