JPH0317606Y2 - - Google Patents

Description

[Detailed description of the invention] This invention connects the switching valve of the hydraulic system that raises and lowers the planting device and the tiltable float of the planting device using a connecting member such as a link, and connects the connecting member near the cockpit. This invention relates to an improvement of a riding rice transplanter in which the sensitivity of sensing the tilt angle of a float is adjusted by operating a sensing lever.

Conventionally, when planting with the above-mentioned riding rice transplanter, the wheels lift mud and form protrusions as the machine rotates on the headland, and in such places,
By raising the front part of the float by operating the sensing lever, the mud pressure applied to the front part of the float (a position far from the rotational fulcrum) is reduced, which dulls the sensing sensitivity. Even if the planting device is in the state where it is most likely to sink by suppressing its operation in the upward direction, if the float rides on the convex portion and is pushed up, the field surface cannot be leveled, and the upward tilting of the float causes Since the switching valve of the hydraulic system operates and the planting device rises, the seedlings cannot be inserted into the muddy soil, resulting in the seedlings tipping over.

The purpose of this invention is to improve the drawbacks of the above-mentioned riding rice transplanter, and the intermediate part of the swinging arm is pivotally connected to the sensing lever provided in the control section, and one end of the swinging arm is The other end is connected to the switching valve of the hydraulic system, and the other end is connected to the front part of the float, whose rear part is pivotally supported to the planting device so that it can tilt up and down, and the sensing lever changes the contact angle of the float to adjust the float sensing sensitivity. In the riding rice transplanter configured to adjust the temperature, the sensing lever is set at the position where the front part of the float rises and the sensing sensitivity becomes the least sensitive, and the member connecting the switching valve and the float moves to the rising range. It is characterized by the provision of a stopper to restrict movement.

The embodiments shown in the drawings will be explained below.
1 is the body of a four-wheeled vehicle, and the rear part is equipped with a seedling stand, a plurality of planting rods, and a float 3 whose rear part is pivoted so that it can tilt up and down. Mounting frame 2a of the planting device attached to the frame 2
are connected so that they can be raised and lowered by a top link 4 and lower links 5, 5, and although not shown, the top link 4 is connected to a hydraulic cylinder attached to the fuselage 1, so that the hydraulic cylinder can be operated to expand and contract. When you do this, the planting device will move up and down.

Reference numeral 6 denotes a sensing lever that is inserted into a guide groove 8 of a lever panel 7 provided on the side of the control section and whose base is supported by a support shaft 9 so as to be tiltable back and forth. hanging arm 1
The middle part of a swinging arm 11 is rotatably attached to the lower part of the 0, and the upper part of the swinging arm 11 is connected to a valve arm 14 that protrudes from a switching valve of a hydraulic pump 13 by a connecting rod 12 having a plate-like part. The lower part of the swing arm 11 is connected via a connecting rod 16 to one end of an L-shaped link 15 that is pivotally supported on the mounting frame 2a, and the upper end is pivotally connected to the L-shaped link 15. The lower end of the connecting rod 17 has its rear part connected to the front part of a connecting rod 18 which is pivotally supported on the planting frame 2, and the front part of the float 3 is connected to the middle part of the connecting rod 18 by a connecting rod 19.

Further, the lower part of the swing arm 11 is pulled forward by a spring 20 whose one end is locked to the body 1.

Reference numeral 21 denotes an elevating lever whose base is pivotally supported at the lower part of the lever panel 7, and an arm 22 protruding from the base is connected to the rear part of a rotating plate 24 by a rod 23, and the rotating plate 24 is a fulcrum. It is pivotally supported by the body 1 by a pin 25, and a pin 26 protruding from the upper part is loosely fitted into a long hole of the connecting rod 12.

A stopper 27 is provided on the upper part of the L-shaped link 15 of the mounting frame 2a, and this stopper 27 stops the L-shaped link 15 when the sensing lever 6 is set at the lowest position e in the guide groove 8. Since it is received as shown in Fig. 3, the swinging arm 1
The valve arm 14 rotates rearward around its lower part, and the upward rotation range of the valve arm 14 is limited to a neutral range D' as shown in FIGS. 3 and 4.

In the above-mentioned riding rice transplanter, when starting the planting work, when it is set to the lowered automatic position, the pin 26 moves to the middle position of the elongated hole, and the spring 20 moves the lower part of the swing arm 11 forward. Since the valve arm 13 is pulled and rotated, the valve arm 13 rotates to the rear lowered position, and the float 3 descends together with the planting device and touches the ground.
8 rotates upward, and the L-shaped link 15 rotates counterclockwise in FIGS. 1 and 2. As a result, the valve arm 14 enters the neutral range, and from now on, the planting device uses the float 3 as a sensing body. Raise and lower automatically.

When adjusting the sensing sensitivity to suit the hardness and softness of the field, when the sensing lever 6 is normally set at the position shown by the solid line in FIG. 3 (position c in FIG. 5), the valve arm 14 is set as shown in FIG.
When the sensor lever 6 is rotated within the range of A' and the rice field is soft, the sensing lever 6 is set to the floating position (position b in Fig. 5) as shown in the dotted line line, and the swinging arm 11 is tilted from the A position to the B position. As a result, the spring 20 contracts, the float 3 becomes more sensitive, and the valve arm 14 rotates within the range B' in FIG.

Furthermore, when the sensing lever 6 is set to the position shown by the dotted line in Fig. 3 (position d in Fig. 5) for a hard field, the swing arm 11 tilts to the C position, and furthermore, when the sensing lever 6 is set to the position shown by the dotted line in Fig. 3 (position d in Fig. 5), the swing arm 11 is tilted to the C position. When planting in a certain location, when the sensing lever 6 is set to the lowest position (position e in FIG. 5) shown by the two-dot chain line in FIG. Since it does not rotate in the counterclockwise direction, the swing arm 11 rotates around the lower part to the rear D position,
The valve arm 14 tilts within the range D' and does not enter the rising range from the neutral range.

That is, when planting in a field with large irregularities, if the sensing lever 6 is set to the lowest position e, even if the float 3 rides on a convex part of the rice field, it will not rise, and the rice field will be leveled by the float 3. In addition, since the valve arm 14 does not tilt to the rising region and the planting device does not rise, the planting claws plant the seedlings at a predetermined depth.

Note that the position of the stopper 27 is not limited to the above-mentioned embodiment, and may be at the X position in FIG.
Alternatively, the same purpose can be achieved by setting it in the Y position.

Figures 6 and 7 show that when the planting device is raised to travel on the road with seedlings supplied to the seedling platform by operating the lift lever 21, the lift lever 21 is moved to the guide groove 8 due to vibration of the machine body or erroneous operation. the most floating position a
This device is designed to prevent the planting device from descending even if it comes off the (raised position) and enters the lowered position, and when the sensing lever 6 is set at the most floating position a of the guide groove 8, the L A stopper 27' is provided on the mounting frame 2a to prevent the mold link 15 from rotating clockwise, that is, toward the descending region shown in FIG. 21 enters the lowered position, at which time the float 3 is in a suspended state, so the L-shaped link 15
The stopper 2 is biased to rotate clockwise.
7' prevents this, the valve arm 14 does not enter the lowering region, and as a result, the planting device does not descend.

As mentioned above, the present invention pivots the middle part of the swinging arm to the sensing lever provided in the control section, connects one end of the swinging arm to the switching valve of the hydraulic system, and connects the other end with the rear part connected to the control valve. In a riding rice transplanter, the sensing lever is connected to the front part of a float that is pivotally supported to be tiltable up and down, and the sensing lever is configured to adjust the float sensing sensitivity by changing the grounding angle of the float. A stopper is provided to restrict the movement of the member connecting the switching valve and the float to the rising area when the front part of the float is set at the position where the front part of the float rises and the sensing sensitivity becomes the least sensitive. When planting in a place where there is a large mound of soil raked up by the wheels when the machine rotates, setting the sensing lever 6 to the lowest position will prevent the switching valve from switching to the rising range. The stopper prevents the float 3 and the planting device from rising, making it possible to level the rice field with the float 3 and to reliably plant the seedlings.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention,
Figure 1 is a side view of the planting lifting device of a riding rice transplanter, Figure 2 is a sectional view taken along line A-A in Figure 1, Figure 3 is a side view of the automatic lifting device, and Figure 4 is an operational view of the valve arm. ,
Fig. 5 is a plan view of the sensing lever guide section, Fig. 6 is a side view of an example with a lowering limit stopper added, and Fig. 7 is a plan view of the sensing lever guide section.
The figure is a diagram showing the operation of the valve arm of the same device. 1... Airframe, 3... Float, 6... Sensing lever, 11... Rocking arm, 12, 16, 17, 1
8, 19...Running rod, 15...L-shaped link, 27...
…stopper.

Claims (1)

[Scope of utility model registration request] The middle part of the swinging arm is pivotally connected to a sensing lever provided in the control section, one end of the swinging arm is connected to a switching valve of a hydraulic system, and the other end is pivoted so that its rear part can be tilted up and down to the planting device. In a riding rice transplanter configured to be connected to the front part of a supported float and to adjust the float sensing sensitivity by changing the ground contact angle of the float with the sensing lever, the sensing lever:
A riding rice transplanter characterized in that a stopper is provided for restricting movement of a member connecting the switching valve and the float to a rising region when the front part of the float is set at a position where the front part of the float rises and the sensing sensitivity becomes the least sensitive. Machine float ground pressure sensing device.