JPS6133525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a riding-type rice transplanter in which a worker rides on a traveling machine to perform rice planting work, and the present invention is designed to keep the ground pressure of the float on the field surface of the seedling planting device approximately constant. The present invention relates to a device for automatic adjustment.

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 deeper or shallower 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 against the field surface can be automatically adjusted to maintain a substantially constant level, and this automatic adjustment can be made smoothly.

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 a top link at the top and a lower link at the bottom. In the riding type rice transplanter, the top link is attached to the top link and the seedling planting device is attached to the top link with respect to the top link with respect to the top link, and the top link is attached to the top link with respect to the top link and the seedling planting device is mounted on the top link to the top link, and the top link is attached to the top link with respect to the top link with respect to the top link with respect to the top link with respect to the top link. The pivot point with the device is constructed so that it can freely move in the longitudinal direction of the traveling aircraft, and a hydraulic pressure return bypass passage is connected to the hydraulic pressure supply pipe to the hydraulic cylinder in the lifting mechanism, so that the hydraulic pressure return A hydraulic control valve is provided in the bypass passage to throttle or open the hydraulic return bypass passage in relation to the back and forth movement of the top link with respect to the traveling aircraft body.

The drawings in which 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 mounted between them and a transmission mechanism (not shown) in both bodies 2 and 3, In addition, by rotating a handle 26 disposed at the front of the seat 25 attached to a gate-shaped frame 25 erected from the fuselage 2, both the front and rear fuselages 2 and 3 are bent in the horizontal direction, thereby performing a steering operation. Furthermore, a POT shaft 30 to which power is transmitted from the engine 21 is provided on the front surface of the front body 2.

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 is a seedling planting unit comprising a transmission case 34 and a pair of left and right planting mechanisms 35 and a float 36. 37 are arranged in parallel, and the respective transmission cases 34 are connected by a tubular member 39. On the upper surface of each transmission case 34, a guide rail 40 having an L-shaped cross section is installed laterally. The seedling stand 14 is placed on this guide rail 40.
is provided horizontally movably, and this seedling planting device 3
Power is transmitted to the input shaft 42 in the front fuselage 1 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 a pair of top link mechanisms 33 at the top.

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 and 32. A tension spring 48 is installed between both lower links 32 and both lifting arms 46, and both lifting arms 46 are rotated by a hydraulic cylinder 51. As a result, 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 a direction to draw it into the cylinder 33'', and a compression spring 52' that biases the top link 33' in a direction to protrude 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 control valve disposed in a hydraulic return bypass passage 54 branched from the hydraulic pressure supply passage 44 leading from the hydraulic pump 49 to the hydraulic cylinder 51, and the hydraulic control valve 45 is connected to the top link mechanism. 33, and the spool of the hydraulic control valve 45 is attached to the top link 33 of the top link mechanism 33.
3', when the top link 33' moves closer to the traveling aircraft 1, the hydraulic control valve 45
throttles and adjusts the hydraulic return bypass passage 54;
When the top link 33' moves away from the traveling body 1, the hydraulic control valve 45 operates to open the hydraulic return bypass passage 54.

Note that the reference numeral 50 in the figure indicates the hydraulic cylinder 51.
This is a manual hydraulic switching valve for manually operating the seedling planting device 31 to raise or lower it.

In this configuration, the manual hydraulic switching valve 50 is operated to lower the seedling planting device 31 so that its float 36 touches the field, and then the manual hydraulic switching valve 50 is operated by the hydraulic pump as shown in FIG. 49 is operated to a position where the hydraulic pressure is sent to the hydraulic cylinder 51, and the traveling body 1 is made to travel forward in that state.
In the case of a field, after the ground is leveled with each float 36, the planting mechanism 35 plants seedlings separated one by one from the seedling pine on the seedling platform 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 aircraft 1, the hydraulic control valve 45 throttles the hydraulic return bypass passage 54, and this throttle adjustment causes the flow to the hydraulic cylinder 51. As the supply amount of hydraulic pressure increases, the seedling planting device 3 is activated by the hydraulic cylinder 51.
1, the ground pressure increased by 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″ pivot points on the traveling aircraft 1 side are separated from each other,
When the top link 33' moves away from the traveling aircraft 1, the hydraulic control valve 45 opens the hydraulic return bypass passage 54, and the hydraulic cylinder 5
Since the hydraulic pressure in 1 is also released at the same time,
Since the seedling planting device 31 moves downward, the traveling body 1
The ground pressure that has decreased due to the upward pitching is automatically returned to its original value.

When the seedling planting device 31 is raised and lowered by the hydraulic cylinder 51 in connection with pitching of the traveling machine 1, the raising and lowering operation is controlled by a hydraulic switching valve in the hydraulic pressure supply passage 44 to the hydraulic cylinder 51. Supplying hydraulic pressure to the hydraulic cylinder 51 and releasing the hydraulic pressure in the hydraulic cylinder 51 with this hydraulic switching valve means supplying and releasing hydraulic pressure in the hydraulic cylinder 51 by the switching operation of the hydraulic switching valve. This will occur rapidly, and a shock will occur at the beginning of the raising and lowering of the seedling planting device 31 against the pitching of the traveling body 1.
The planting of seedlings relative to the field will vary considerably during the initial transition period when the seedling planting device is raised or lowered.

In contrast, the present invention connects the hydraulic pressure return bypass passage 54 to the hydraulic pressure supply passage 44 from the hydraulic pump 49 to the hydraulic cylinder 51 as described above, and the traveling aircraft 1 is connected to the hydraulic pressure return bypass passage 54 in the hydraulic pressure return bypass passage 54. A hydraulic control valve 45 related to pitting is provided to raise and lower the seedling planting device 31 by throttling or opening the hydraulic return bypass passage 54, and the oil pressure is supplied to the hydraulic cylinder 51. The discharge becomes gentler than when a hydraulic switching valve is provided in the hydraulic pressure supply passage 44 of the hydraulic cylinder 51, and the impact at the beginning of the raising and lowering of the seedling planting device 31 against pitching of the traveling machine body 1 can be reduced. This can prevent the seedling planting on the surface from changing during the initial transition period when the seedling planting device 31 is raised or lowered.

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, fluctuations in the ground pressure of the float due to pitching of the traveling machine body can be reduced, in other words, the ground pressure of the float to the field can be kept approximately constant with respect to pitching of the traveling machine body, and, It is possible to reduce fluctuations in seedling planting during the initial transitional period when the seedling planting device rises or descends in accordance with the pitching of the traveling body, so that the ground pressure of the float can be kept approximately constant with respect to the pitching of the traveling body. Together with this, it has the effect of significantly stabilizing the planting depth of seedlings in the field.

[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 for lifting, 49... Hydraulic pump, 45... Hydraulic control valve, 44... Hydraulic supply passage, 54... Hydraulic return bypass passage.

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, a hydraulic pressure return bypass passage is connected to the hydraulic pressure supply pipe to the hydraulic cylinder in the lifting mechanism, and in the hydraulic pressure return bypass passage, the hydraulic pressure is connected to the hydraulic pressure return bypass passage in relation to the back and forth movement of the top link with respect to the traveling aircraft body. 1. A float ground pressure adjustment device for a seedling planting device in a riding rice transplanter, characterized in that it is provided with a hydraulic control valve configured to throttle or open a hydraulic return bypass passage.