JPH0244653Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention extends an upper link and a lower link from a car body, and connects vertical links between the extending ends to raise and lower the car body side. The present invention relates to a rice transplanter having a link mechanism.

[Conventional technology]

In the rice transplanter mentioned above, the seedling planting device is
There are vertical links of elevating link mechanisms that are configured to be detachable, and their structures are as follows. In other words, the seedling planting device has a structure in which a pair of left and right swing links that can swing left and right are provided at the front part of the seedling planting device, and the swing ends of both swing links are respectively attached to the vertical links of the elevating link mechanism.

[The problem that the idea attempts to solve]

With the above structure, both swing links are in a freely swingable state, so the seedling planting device must be positioned at an appropriate position relative to the vehicle body so that both swing links can be connected together. It was difficult. for example,
If one swing link is connected and then the other swing link moves, this swing link cannot be positioned at the connection point. Therefore, there is a drawback that the previously connected swing link must be disconnected and the position of the seedling planting device relative to the vehicle body must be adjusted again, which tends to be an inconvenient situation.

An object of the present invention is to make it easier to install a seedling planting device by a simple improvement in view of the above-mentioned conventional situation.

[Means to solve the problem]

The feature of this invention is that in the above rice transplanter,
It consists of the following structure. In other words, a pair of left and right swinging links that can swing left and right are provided at the front of the seedling planting device, a connecting member is pivotally installed across both swinging links, and a link mechanism is installed at the front of the seedling planting device. In addition, this link mechanism is configured to be detachably attached to the vertical link of the elevating link mechanism, and its functions and effects are as follows.

[Effect]

If configured as described above, both swing links will swing together, so if one swing link is positioned at a position where it can be connected to the vertical link on the elevating link mechanism side, the other swing link will also swing. It will automatically come to a position where it can be connected. Thereby, the swing link on the other side can be easily connected to the vertical link on the elevating link mechanism side without having to perform any special positioning work for the swing link on the other side.

[Effect of idea]

As described above, compared to the conventional structure in which two sets of swing links are positioned separately, the seedling planting device can be connected to the vertical link of the lifting link mechanism by simply positioning one swing link. As a result, we were able to improve the workability of attaching the seedling planting device.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, a vehicle body 3 includes a pair of left and right rear wheels 1 for propulsion, and a pair of left and right front wheels 2 for steering operation and propulsion, and a front driving unit 4;
In addition, a boarding operation section 5 is provided, and a seedling tray 6 that moves back and forth horizontally with a constant stroke, and a plurality of pine-shaped seedlings W placed side by side on the seedling tray 6.
A seedling planting device equipped with various devices such as a plurality of seedling planting claws 7 that sequentially take out seedlings one by one from the lower end row of each and plant them on the mud surface, and a plurality of soil leveling floats 8 arranged in parallel in the left and right direction of the vehicle body. An attachment device 9 is connected to the rear of the vehicle body 3 via a lift link mechanism 10 by a hydraulic cylinder 11 so that it can be driven up and down, and a plurality of seedlings are sequentially planted as the vehicle travels. It is configured as a rice transplanter.

Next, the lifting and lowering operation structure of the seedling planting device 9 will be explained.

As shown in FIG. 6, a center float 8a disposed at the center of the left and right sides of the vehicle body 3 is connected to a seedling planting device 9 so as to be able to swing vertically around a horizontal axis P at its rear end. , center float 8
While allowing the front end of a to move up and down,
Further, it is connected to the seedling planting device 9 via a link mechanism 13 while being biased downward by a spring 12 . Then, one link 13a of the link mechanism 13, which swings as the center float 8a moves up and down, and the operating tool 14a of the control valve 14 for the hydraulic cylinder 11 for driving up and down are interlocked by a wire 15, In addition, the hydraulic cylinder 11 is automatically controlled to maintain the appropriate height of the seedling planting device 9 above the ground by detecting the swinging of the center float 8a due to a change in ground load caused by a change in the depth of the tiller. It is configured.

Reference numeral 16 in the figure is a lever for manual operation of the control valve 14 provided in the boarding operation section 5, and by operating the lever 16 to the automatic control position A, the seedling planting device 9 automatically controls the elevation. state. Also,
By operating to the fixed position N, the seedling planting device 9 is placed in a lowering prevention state, by operating to the forced up position U, the seedling planting device 9 is forced to rise, and by operating to the lowered position D, the seedling planting device 9 is prevented from descending. It is configured so that the planting device 9 can be brought down under its own weight.

Further, the spring 12 for setting the ground load of the center float 8a is interlocked with the lever 16 and a lever 17 for setting the ground load provided in the boarding operation section 5 via a wire 18. By selectively locking the lever 17, which is neutrally biased by the spring 20, in the plurality of lever locking portions 19a formed in the lever guide hole 19, the spring 17 for setting the ground contact load is operated.
The biasing force on the center float 8a is changed, and the center float 8 is adjusted according to the degree of softness and hardness of the mud surface.
It is configured so that the set ground load of a can be changed and adjusted.

Furthermore, a lever locking portion 1 is provided in the lever guide hole 19.
9a, a large number of lever locking portions 19a are formed at a relatively small pitch on one side of the lever guide hole 19, and a small number of lever locking portions 19a are formed at a relatively large pitch on the other side. In addition, the lever locking portions 19a are omitted at both ends of the lever guide hole 19.

In other words, when it is necessary to finely adjust the set ground load of the center float 8a, the lever locking portion 19a on the small pitch side is used, and when such fine adjustment is not required, the lever locking portion 19a on the large pitch side is used. The stop part 19a is used, and the adjustment stage can be selected as appropriate depending on the state of the planting work, thereby making it easy to adjust the setting ground load of the center float 8a as a whole. There is.

In addition, by omitting the lever locking portions 19a at both ends of the lever guide hole 19, the lever 17 can be locked when operating the lever 17 at both ends of the lever guide hole 19, which is usually used locally. The configuration is such that the local operations can be performed more quickly by eliminating the need for operations.

Next, the connection structure of the seedling planting device 9 to the vehicle body 3 will be described in detail.

As shown in FIGS. 1, 2, and 3, a single upper link 21 and a pair of left and right lower links 22 are connected to the hydraulic cylinder 11 at the rear end of the vehicle body 3. The upper link 21 and both lower links 2 are pivotally connected to each other so as to be vertically swingable.
The rear ends of the two are pivotally connected by a vertical link 23,
It constitutes the elevating link mechanism 10. On the other hand, the planting mission case 24 as a support for the seedling planting device 9 and the vertical link 23 on the lifting link mechanism 10 side are swung around the longitudinal axis Q at both the upper and lower end connecting portions. They are connected via a link mechanism 25 that is formed of a pair of left and right swinging links 25a and has an inverted "8" shape when viewed from the front and back.

In other words, the three-point link action of the elevating link mechanism 10 always maintains the appropriate longitudinal tilting posture of the seedling planting device 9 during the lifting and lowering operations, and the action of the link mechanism 25 allows the seedling planting device 9 to be tilted forward and backward. The seedling planting device 9 is configured to be able to roll freely around the virtual axis X, and the left and right rolling posture of the seedling planting device 9 is always maintained at an appropriate working posture regardless of the left and right inclination of the vehicle body caused by the ups and downs of the tiller.

In addition, in order to reduce the overall space when transporting or storing the seedlings on the road, the seedling planting device 9 is configured so that it can be attached to and detached from the vehicle body 3 at the connecting portion between the link mechanism 25 and the vertical link 23. The attachment and detachment structure will be described below.

As shown in FIGS. 2 and 3, both swing links 25 are pivotally connected to the planting mission case 24.
The upper ends of a have an inverted “L”-shaped cross section.
The connecting members 26 are pivotally connected. Then, the connecting member 26 is engaged from above with the left and right sides of the vertical link 23, which is formed in an inverted "T" shape when viewed in the front-rear direction, and the vertical link 23
A hook 27 attached to the connecting member 26 is engaged with a pin 28 fixed to the connecting member 26. As a result, the connecting member 26 is prevented from coming off by the hook 27.
The seedling planting device 9 is firmly and removably connected and supported to the elevating link mechanism 10 by the abutment and locking action of the three faces of the vertical link 23 and the vertical link 23 in different directions.

In addition, by connecting the upper ends of both swinging links 25a with one connecting member 26 so that the swinging links 25a swing together, both swinging when the seedling planting device 9 is removed. The relative swinging posture of the link 25a is regulated, and when the seedling planting device 9 is installed, both swinging links 25a are simultaneously moved up and down by the lifting link mechanism 1.
0, and is particularly designed to simplify the installation process.

[Another example]

To configure the attachment/detachment structure of the seedling planting device 9 to/from the vehicle body 3, as shown in FIG. are connected by a connecting member 29, and
A structure may also be used in which the pivot shafts 30 are rotatably attached to the upper end side pivot boss portions of each swing link 25a.
Then, the pivot shafts 30 are inserted into the holes 31 bored in both lateral parts of the vertical link 23, and the pivot shafts 30 are respectively prevented from coming out with pins 32 as shown in the fifth figure, and the seedling planting device 9 is attached to the elevating link mechanism 10. Also in this case, due to the action of the connecting member 29, both swing links 25
The relative rocking posture of a can be controlled, and one pivot shaft 3
0 with respect to the hole 31, the other pivot shaft 30 can also be automatically aligned, and the seedling planting device 9 can be easily installed.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanter according to the present invention, in which Fig. 1 is an overall side view of the rice transplanter, Fig. 2 is an enlarged side view of the connection part of the seedling planting device, and Fig. 3 is a rear view of the rice transplanter. , FIG. 4 is an exploded perspective view showing another embodiment, FIG. 5 is an enlarged side view of the pivot shaft retaining structure in another embodiment, and FIG. 6 is a schematic diagram showing the lifting and lowering operation structure of the seedling planting device. It is a system diagram. 3...Vehicle body, 9...Seedling planting device, 10...Elevating link mechanism, 21...Upper link, 22...
Lower link, 25... Link mechanism, 25a...
Swing link, 26, 29...connecting member.

Claims (1)

[Claims for Utility Model Registration] An upper link 21 and a lower link 22 are extended from the vehicle body 3, and a vertical link 23 is pivotally connected between their extending ends to constitute the elevating link mechanism 10 on the vehicle body 3 side. In this rice transplanter, a pair of left and right swinging links 25a, 25a that can swing left and right are provided at the front part of the seedling planting equipment 9, and a connecting member 26, 29
A rice transplanter is provided with a link mechanism 25 at the front of the seedling planting device 9, which is pivotally supported, and the link mechanism 25 is detachably attached to the vertical link 23 of the elevating link mechanism 10.