JPH0313842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a body lifting device for a walking rice transplanter, and more specifically, a propulsion wheel is provided via a swing case that is vertically movably attached to the front and rear middle of the rice transplanter body, and A rice paddy sliding body supported in a vertically movable manner is provided on the lower side, and the propulsion wheels are moved up and down by a hydraulic control device in response to fluctuations in ground pressure acting on the rice paddy sliding body in the planted state to move the machine against the rice field. This invention relates to a body lifting device for a walking rice transplanter that is controlled to rise and fall to a substantially constant level.

In the above-mentioned aircraft lifting device, a lifting detection means whose lower end is linked to the surface sliding body is connected to the hydraulic switching valve of the hydraulic control device, and a hand-operated device is also linked, and the hand-held operating device is operated. By switching the hydraulic switching valve, the aircraft is forcibly raised, or the hydraulic switching valve is placed in a neutral state to fix the aircraft in the ascending state.

However, in conventional aircraft lifting and lowering systems, the operation path of the handheld operating device was formed so that the hydraulic switching valve went from the automatic position where it was planted, to the neutral position, and then to the raised position where the aircraft was forcibly raised. When switching the vertical motion of the propulsion wheels to a temporarily fixed state when turning on the ground, the hand control device must be set to the raised position of the hydraulic switching valve, and after the aircraft has surfaced, it must be returned to the neutral position before turning. Therefore,
Hand operations are extremely complicated and can easily lead to incorrect operation.
Because the hand operation goes through the steps of automatic position → neutral → ascent → neutral, turning operations are troublesome and work efficiency is low.Furthermore, if you omit the operation and turn without raising the aircraft, the Tamen sliding body will be damaged. Due to the high ground pressure, mud pushing development by the paddy surface sliding body occurs, which has the disadvantage of disturbing the paddy surface and significantly reducing planting accuracy.

In view of the above-mentioned circumstances, the present invention was devised to eliminate the conventional drawbacks, and in particular,
The hand control device is located below the upper end of the seedling stand and approximately in the center of the left and right control handles, and a rising portion for shifting the hydraulic switching valve to the aircraft raised position is arranged in the middle area of the operating path. An automatic position for shifting the hydraulic switching valve to the planting state is arranged on the upper side close to the upper end of the seedling stand, and a neutral position for shifting the hydraulic switching valve to the neutral state is arranged on the lower side of the rising part. As a result of this, when the rice transplanter turns to the headland, if the hand control device is operated from the automatic position to the raised position, the machine will move up while passing this raised position, and the machine will move to the headland. The above-mentioned hand control device should be raised to a limit that does not impair the leveling of the aircraft, thereby making it possible to easily turn the aircraft while reducing the mud pushing phenomenon caused by the paddy sliding body. Since it is located approximately in the center of the left and right control handles, it can be operated quickly with a convenient hand when turning the aircraft clockwise or counterclockwise on a headland, making it easy to turn without stopping the aircraft. It is an object of the present invention to provide a device for lifting and lowering the body of a walk-behind rice transplanter, which allows for smooth transition to planting work after turning, and improves work efficiency.

To explain the configuration of the present invention with reference to an embodiment shown in the drawings, 1 is equipped with an engine 2 at the front end and a planting device 3 at the front of the lower end of the seedling stand 3' at the rear end. The front end of a swing case 4 is pivotally attached to the side of the machine 1 via a pivot 4a so as to be able to swing up and down, and the rear end of A propulsion wheel 5 is mounted on an axle 5a, and the body 1 is moved up and down by vertically swinging the swing case 4 about a pivot 4a. Reference numeral 6 denotes a surface sliding body mounted on the lower surface of the fuselage 1 so as to be movable up and down. Reference numeral 7 denotes an arm that swings the swing case 4 up and down, and is connected to a hydraulic control device 8.

Reference numeral 9 denotes a control handle extending in a curved manner from the rear end of the fuselage 1 toward the rear and upward, and the control handle 9 has a transverse rod 9a located below the upper end of the seedling stand 3'. It is located on one side and straddles the other.
An operation panel 10 and a pivot shaft 1 are provided at the center of the horizontal rod 9a.
1 is attached via a bracket 9b and a stay 9c.

Reference numeral 12 denotes a switching lever pivotally attached to the pivot shaft 11, and the switching lever 12 is connected to the hydraulic control device 8 via a wire 13, and the switching lever 12 resists the tension of a spring (not shown). Lever 1
2 is swung around the pivot shaft 11 as a fulcrum,
The automatic position 12A of the hydraulic control device 8, which was held by the tension of the spring, is sequentially raised to the raised position 12.
B, switching control is performed between a neutral position 12C and a lowered position 12D. 14 is a hydraulic lever pivotally attached to one side of the switching lever 12,
The hydraulic lever 14 is slidably guided by a guide groove 15 formed on the operation panel 10, and the switching lever 12 is moved from the automatic position 12A to the raised position 12B, the neutral position 12C, and the lowered position 12 against the tension of a spring.
It is pressed and moved toward D. Therefore, in the operating path of the hydraulic lever 14, an ascending section is disposed in the intermediate region thereof to switch and control the hydraulic control device 8 to the aircraft ascending position via the switching lever 12.
An automatic position for switching and controlling the hydraulic control device 8 to the planting state via the switching lever 12 is arranged above the rising portion close to the upper end of the seedling stand 3', and further below the rising portion. A neutral position is arranged in which the hydraulic control device 8 is switched to a neutral state via the switching lever 12, and thus, during the shift pattern of the hydraulic lever 14, the shift pattern is changed from the automatic position in the planting state to the raised position in which the aircraft is forcibly raised. A continuous pattern portion is formed from the top to the bottom leading to the neutral position. Note that the guide groove 15 has a positioning recess 1 for locking the hydraulic lever 14 at a position 14B corresponding to the raised position 12B of the switching lever 12.
5a, and fixing grooves 15b and 15c are formed in which the hydraulic lever 14 is fixed at a position 14C corresponding to the neutral position 12C of the switching lever 12 and a position 14D corresponding to the lowered position 12D, respectively. The switching lever 12 and the hydraulic lever 14 are connected to each other by pawl clutches 12a and 14a formed on their opposing surfaces, and the tension of the spring causes the pawl clutch 12a of the switching lever 12 to be connected to the hydraulic lever 14. The front surface of the pawl clutch 14a in the rotating direction is pressed against it. Therefore, as the hydraulic lever 14 is operated, the switching lever 12 appropriately switches and controls the hydraulic control device 8, but even when the hydraulic lever 14 is fixed, the switching lever 12 can be swung in the direction against the spring. It is something. Further, on the other side of the switching lever 12, a wire 1 is connected to the planting device 3.
A planting clutch lever 17 is pivotally mounted, and a claw clutch 17a formed on the planting clutch lever 17 is opposed to the rear of a claw clutch 12b formed on the other side of the switching lever 12. These pawl clutches 12b, 17a
The switching lever 12 can be switched and swung against the spring by the collision between the pawl clutches 12b and 17a.
When the hydraulic lever 14 is swung to the off position 17B, the hydraulic lever 14 is swung above the raised position 14B, and the switching lever 12 is moved to the raised position 12.
B. When the planting clutch lever 1 is switched to the neutral position 12C or the lowered position 12D.
Claw clutches 17a, 12 between 7 and the switching lever 12
The collision b does not take place.

18 is an automatic control mechanism of the hydraulic control device 8, and the automatic control mechanism 18 is shown in FIGS. 7A, B, and C.
It is configured as shown in . That is, in these figures, 19 is an arm linked to the switching lever 12, and the arm 19 swings about a shaft 20 and comes into contact with the lower surface of the lever 22, which swings about a shaft 21 as a fulcrum. A rod cam 26 which pivotally supports the roller 19a, is connected to the lever 22 via a spring 23, and has a protruding pin 25 that can collide with a link 24 that swings about the shaft 21 as a fulcrum. An indicator 27 is attached to the end of the slider 22 as a lifting/lowering detecting means that collides with the upper surface of the surface sliding body 6 and is moved up and down. It is connected. Further, the link 2 is arranged so that the link 24 is rotated integrally when the lever 22 is rotated clockwise.
4 is implanted with a pin 24a against which the lever 22 collides. The above-mentioned members constitute a linkage mechanism 8' of the hydraulic control device 8 that operates the hydraulic switching valve 28.

Next, the operation of the present invention constructed as described above will be explained. Now, move the hydraulic lever 14 to automatic position 1.
4A and move the switching lever 12 to the automatic position 12.
A, and when the planting clutch lever 17 is positioned at the entry position 17A, the machine 1 equipped with the planting device 3 enters the planting state. At this time, as shown in FIG. 7A, the roller 19a pivotally connected to the arm 19 separates from the lower surface of the lever 22, and the
2 swings as the indicator 27 moves up and down, and is connected to a link 24, a spring 23, or a pin 24a.
And the hydraulic switching valve 28 is oscillated via the rod 29 and plate 30. Therefore, the hydraulic switching valve 2
8 raises and lowers the machine body 1 and automatically adjusts the height of the machine body 1 relative to the rice field surface to a constant value, so that the planting device 3 is always kept at a predetermined height above the rice field surface, so it is possible to adjust the height of the machine body 1 relative to the rice field surface at a constant level. Regardless, planting is performed at a predetermined planting depth. In such a state, when turning the aircraft 1 on a headland or the like, the planting clutch lever 17, which is in the engaged position 17A, is moved to the off position 17B, and the vertical movement of the propulsion wheels 5 is temporarily fixed by the hydraulic lever 14. However,
At this time, when the hydraulic lever 14 is operated to switch the switching lever 12 from the automatic position 12A to the raised position 12B, the tension of the wire 13 causes the roller 19a of the arm 19 to move the lever 22 as shown in FIG. 7B. The machine body 1 is raised by lowering the hydraulic switching valve 28. And further hydraulic lever 1
4 to position the switching lever 12 to the neutral position 12C, the link 24 is swung in the opposite direction by the pin 25 fixed to the rod cam 26 as shown in FIG. The hydraulic control device 8 is fixed by returning to the neutral position.
In this way, when the switching lever 12 is switched from the automatic position 12A to the neutral position 12C by directly moving the hydraulic lever 14 in one direction when the aircraft 1 is turned, the movement process moves to the raised position 12B.
The aircraft 1 is raised while passing through the headland, and the aircraft 1 is fixed in the raised state to the extent that it does not disturb the leveling of the headland.
The ground pressure is reduced, and therefore, the aircraft 1 can be easily turned around while reducing the mud pushing phenomenon caused by the field sliding body 6. After turning, the hydraulic lever 14 is returned to the automatic position 14A, the switching lever 12 is set to the automatic position 12A, and the planting clutch lever 17 is placed in the entry position 17A, so that planting can be started immediately. Therefore, the transition to planting work after turning can be made smoothly, and work efficiency can be improved.

In short, according to the body lifting device of the walk-behind rice transplanter of the present invention, during the shift pattern of the hand-operated device, there is a shift pattern portion in a straight line from the top to the bottom from automatic → rise → neutral. Because of this, when turning the aircraft in a planting state on a headland or the like, or when returning the aircraft to a planting state after turning, it is sufficient to simply push down or pull back the hand control device. Therefore, compared to the conventional device of this type, which raises and fixes the aircraft in two steps, the operation is not extremely easy, and the operating direction of the push-down and pull-back operations is based on the propulsion wheels. Since it is aligned with the vertical movement direction of
The driver's operating sensation is natural and effortless, and there is no risk of erroneous operation. In addition, the hand control device is located approximately in the center of the left and right steering handles, so when turning clockwise or counterclockwise on a headland, you can quickly press down from the automatic position to the neutral position with your convenient hand. Moreover, the load does not shift to the left or right during the push-down operation, which prevents the aircraft from wobbling.In addition, in the process of operating the hand-held operating device from the automatic position to the neutral position, the operating device passes through the ascending section, which prevents the aircraft from wobbling. As the aircraft can be fixed in the raised state without disturbing the leveling of the headland, it is possible to reduce mud pushing by the paddy sliding body, and it is also possible to improve the planting after turning. It also allows for a smooth transition to work. Furthermore, the hand-operated device is
Since the automatic position is located on the side approaching the upper end of the seedling stand on the road side of the operation path, the hand control tool that is locked in this automatic position during planting work can be used on the driver's feet or lower abdomen. There is no risk of being hit by mud, and since it is located far away from the field surface, there is no risk of being exposed to muddy water.The hydraulic switching valve of the hydraulic control device is always maintained in the proper operating state, and the unevenness of the tiller is controlled. Alternatively, planting can be performed at a predetermined planting depth regardless of depth.

[Brief explanation of the drawing]

The drawings show an embodiment of the device for lifting and lowering the body of a walking-type rice transplanter according to the present invention, in which FIG. 1 is an overall side view of the rice transplanter, and FIG. 2 is a perspective view of the hand-operated device. is an exploded perspective view of the main parts, Fig. 4 is a front view of the main parts, Fig. 5 is a side view of the main parts, Fig. 6 is a side view showing the relationship between the switching lever and the hydraulic lever, and Fig. 7A is a side view of the main parts. A side view of a part of the hydraulic control device in an automatic position state, B is a side view in the raised position state, and C is a side view in the neutral position state. In the figure, 1 is the fuselage, 3 is the planting device, 5 is the propulsion wheel, 6 is the rice slide, 8 is the hydraulic control device, 8' is its linkage mechanism, 9 is the control handle, 10 is the operation panel, and 12 is the switch. Lever, 14 is a hydraulic lever, 14
A is its automatic position, 14B is its raised position, 14
C is its neutral position, and 28 is a hydraulic switching valve.

Claims (1)

[Claims] 1. An engine is mounted on the front end of the rice transplanting machine, and a control handle for walking control is provided at the rear of the rice transplanting machine that protrudes upward, and along the front side of the control handle,
A seedling rack is provided that is tilted backwards so that the upper end is tilted backwards from the lower end, and a planting device is provided on the front side of the lower end of the seedling rack, and is installed vertically movably in the middle of the front and rear of the rice transplanting machine. A rice transplanter comprising a propulsion wheel via a swing case, a rice sliding body supported so as to be movable up and down on the underside of the machine body, and a hydraulic control device for moving the propulsion wheel up and down, and a hydraulic switching valve. The hydraulic switching valve is connected to a lift detecting means whose lower end is linked to the rice field sliding body, and further linked to a hand-operated device, which is located below the upper end of the seedling stand on the left and right sides. It is located approximately in the center of the control handle, and in the middle of its operating path there is a rising part that shifts the hydraulic switching valve to the aircraft raised position, and above the rising part, the hydraulic switching valve is shifted to the planted state. A walk-behind rice transplanter characterized in that an automatic position is disposed close to the upper end of the seedling tray, and a neutral position for shifting a hydraulic switching valve to a neutral state is disposed below the rising part. Aircraft lifting device.