JPS6041065Y2 - Planting device lifting mechanism in rice transplanter - Google Patents

Description

[Detailed Description of the Invention] The present invention comprises: an upper link pivotally connected to the machine so that it can only rotate; a vertical link that is pivotally connected to the front end of the upper link so that it can only swing; a lower link that is pivotally connected to the lower end of the link and extends in the same direction as the upper link in a parallel or substantially parallel attitude; and a rear end of the upper link and a rear end of the lower link. The planting device is connected to the machine so as to be able to rise and fall freely via a parallel link mechanism consisting of a rear vertical link that is pivotally connected, and the upper link or its interlocking member and a fixed part on the machine side. A cylinder for driving the parallel rotation link mechanism is interposed between the two links or their interlocking members among the upper link, the lower link, the vertical link, and the rear vertical link. , the planting allows the parallel swinging movement of the parallel link mechanism in the lower range of the entire lifting range of the device, and allows any two of the links or their interlocking members to move in the upper range. In addition to providing members that abut and lock each other to prevent the parallel rocking motion of the parallel link mechanism, it is possible to change and adjust the relative deformation state of the link mechanism in a state where the parallel rocking motion is blocked by the member. Planting in a rice transplanter, which is a major factor in rice transplantation, is related to the device's lifting and lowering mechanism.

This type of rice transplanter is equipped with a device lifting mechanism.In the lower range of the entire lifting range of the planting device, the planting device can be raised and lowered in parallel to adjust the planting depth. In the upper range, the planting device can be rotated up and down around the pivot axis of the upper link with respect to the main unit, and the position of movement conversion from parallel up and down movement to rotational up and down movement can be set arbitrarily. Therefore, efficient planting can be done depending on the depth of the wetland.

The purpose of the present invention is to construct a lifting mechanism for planting in such a rice transplanter with a simple structure.

A characteristic feature of the present invention, which was taken to achieve the above object, is that, in the above-mentioned device, the member is a nut screwed onto a rod that is swingably connected to the link. This configuration provides the following effects.

That is, by adjusting the position of the nut, any of the above two
The relative deformation state of the link mechanism when the two links abut and lock each other can be changed and set, and the device lifting mechanism for planting in the rice transplanter described above can be configured with a simple structure.

Hereinafter, an embodiment of the present invention will be described based on the drawings. At the rear of the riding machine 1, there is a seedling stand 2 tilted forward, and a claw 3 for planting.
The five-row planting method equipped with four groups of soil leveling floats is a riding rice transplanter in which a device 5 is connected so as to be movable up and down. A mechanism is provided to link the plowing depth detection device 7 and a manual operation lever 9 provided near the driver's seat 8.

The drive elevating mechanism 6 includes an upper link 11 that extends rearward from a swing shaft 10 that is rotatably supported by the machine 1 and rotates integrally with the swing shaft 10, and a vertical link 12 which can swing freely; a lower link 13 whose front end is pivotally connected to the lower end of the vertical link 12 and which is substantially parallel to the upper link 11;
A parallel link mechanism A consisting of a rear vertical link 24 that pivotally connects the rear end of the lower link 13 to the rear end of the lower link 13 is connected to the rear vertical link 24 that pivots between the vertical link 12 and the lower link 13.
6 to the fixed part on the side of the main unit 1 and the planting, which is pivotally connected to this link mechanism A, is caused by the biasing action by the weight of the device 5, so that the pivotally connecting part 16 is moved to the swinging support shaft 10. Between the free end of the link arm 14, which is held at a specific position around the periphery, fixedly extends from the swing support shaft 10, and is operatively connected to the upper link 11, and the fixed part on the machine 1 side. A hydraulic cylinder 15 that drives the link mechanism A is interposed between the two, and the planting device 5 is raised and lowered in parallel by the driving parallel swing motion of the link mechanism A.

Furthermore, this drive elevating mechanism 6 is arranged between the pivot connecting portion 16 and the link arm 14 in the lower planting depth adjustment area of the entire elevating area of the device 5. The link arm is attached to a member 18 attached to the tip of a tension rod 17 extending swingably from the lower link 13 in a region above which the link mechanism 5 is allowed to swing in parallel. By abutting and locking the vertical link 12 and swinging it around the swinging support shaft 10,
The entire link mechanism A and the planting device 5 are rotated up and down around the swing shaft 10 while preventing the parallel swing movement of the link mechanism A, so that in the lower region, the link mechanism A
Planting is carried out by the parallel rocking motion of the device 5, which moves up and down while maintaining the attitude of the device 5 in relation to the machine. For planting, a mechanism 19 is used to drive the device 5 up and down with respect to the machine 1 so that the angle of inclination to the ground of 2 gradually becomes medium as it goes upwards.
It is organized as follows.

The mechanism 19 has a nut that is screwed onto the tension rod 17 to attach the abutment and locking member 18, and by changing the position of the abutment and locking member 18 in the longitudinal direction of the rod,
The relative deformation state of the link mechanism A when the link arm 14 is abutted and locked by the abutting and locking member 18 is changed and adjusted so that its motion conversion position can be changed.

The plowing depth detection device 7 is provided with the float 4 so as to be able to swing up and down with the vicinity of its rear end as a fulcrum, and the float 4 is biased to swing in the ground contact direction (downward) with a set pressure. , a setting spring 20 is provided to make the float 4 swing in accordance with changes in ground pressure caused by changes in the depth of the plowing bed (changes in depth for planting), and the float 4 is used as a sensor. The structure is such that the depth of the plowing platform can be detected by the vertical movement of the plow.

The above-mentioned linkage mechanism controls the control valve 21 for the hydraulic cylinder 15 using a three-position switching valve and the sensor float 4 to control the planting depth based on the detection result of the sensor float 4 in the lower region. While interlocking and connecting the valve 21 to automatically control the valve 21 so as to maintain the set depth, the valve 21, the lever 9, and the vertical link 12 of the link mechanism A are connected so that the lever 9 is at one end position P of its operating path. When the sensor float 4 of the valve 21
When the lever 9 is at a position other than the one end position P, the interlocking action of the valve 21 with respect to the sensor float 4 is cut off in the upper region, and at the same time, the lever 9 is moved from the one end position P. Planting is performed by automatically raising and lowering the device 5 to a height position commensurate with the amount of operation, and in conjunction with stopping and holding the device 5 at that position. Specifically, the device 5 is configured as follows.

In other words, as described above, the valve 21 and the sensor float 4
A first linking rod R1 is provided, and a connecting point a between the first linking rod R1 and the valve 21 is provided.
A member 22 that can swing with a seesaw using the lever as a fulcrum, and a lever 9
By pressing one end of the seesaw swinging member 22 based on the operation, the seesaw swinging member 22 is swung toward the other end against the pressing force of the setting spring 20 acting on the connection point a. the second linking rod R2 which can be moved to switch the valve 21 to the raised state; By moving the other end of the seesaw swinging member 22, when the pushing force of one end by the lever 9 is greater than the pushing force of the setting spring 20 acting on the connecting point a, the valve 21 is brought into the raised state. While holding the seesaw swinging member 22, connect it to the connection point 3.
When the seesaw swings around the surroundings, and when the pushing force at one end becomes smaller than the pushing force at the connecting point, the seesaw swinging member 22 swings around the one end, and the valve 21 becomes neutral. A feedback rod (R3) that causes the operation position of the lever 9 to react with the lifting/lowering stop position of the device 5 for planting by switching to and operating the (lifting stop) state.
It's set up.

In addition, the linkage mechanism between the lever 9 and the valve 21 is elastically deformed according to the amount of operation accompanying the operation of the lever 9, thereby allowing the lever 9 to be operated in advance to a predetermined position, and at the same time allowing the advance operation of the lever 9 to a predetermined position. A spring 23 is interposed to apply a valve actuation force corresponding to the amount of operation, and to reduce the applied valve actuation force as the device 5 actually moves up and down during planting.

The pivot connection structure between the first linking rod R1 and the seesaw swinging member 22 with respect to the valve 21 is achieved by bending the end of the first linking rod R1, as shown in FIG. The second end r1 is used as a pivot pin for pivotal connection.

[Brief explanation of the drawing]

The drawings show an embodiment of the rice transplanting device 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 with a partial cutout of the main parts, and Fig. 3 shows the main parts. A perspective view of the mechanism, and FIGS. 4 to 7 are explanatory views of the operation of raising and lowering the planting device. 1... This machine, 5... Planting device, 15
・Bending/driving cylinder, 21...Control valve,
4...Sensor, 22...Seesaw swinging member, 9...Manual operation lever, R3...
...Feedback components.

Claims (1)

[Scope of utility model registration request] The upper link 11 is pivotally connected to the machine 1 so that only rotation is possible.
, a vertical link 12 pivotally connected to the front end of the upper link 11 so as to be able to swing only; and a vertical link 12 pivotally connected to the lower end of the vertical link 12 so as to be in a parallel or almost parallel position with respect to the upper link 11. and the lower link 13 extending in the same direction as that.
, the rear end of the upper link 11 and the lower link 13
The planting device 5 is connected to the main machine 1 so as to be movable up and down via a parallel linkage mechanism A consisting of a rear vertical link 24 which pivotally connects the rear end of the device 5 to the upper link. 11 or its interlocking member 14 and the fixed part on the machine 1 side, a cylinder 15 for driving the parallel link mechanism A is interposed, and the upper link 11, the lower link 13, and the vertical links 12 The planting is carried out over any two links 11.13 of the and rear vertical links 24 or their interlocking members 14, and in the lower range of the entire lifting range of the device 5, the planting is carried out in the parallel direction of the parallel linkage mechanism A. Allowing rocking motion, and in an upper range, any two of the links 11, 13 or their interlocking members 14 are abutted and locked to each other to prevent parallel rocking motion of the parallel linkage mechanism A. A member 18 is provided, and the member 18
For planting in a rice transplanter, the member 18 can be freely swung from the link 13 in the device elevating mechanism. Rod 17 connected to
The rice transplanter is characterized by a nut that is screwed onto the rice transplanter's lifting mechanism.