JPH0159847B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention uses a buffer mechanism to improve operability by eliminating the need for stopping operations after raising the seedling planting device beyond a set level when raising the seedling planting device. A single-acting hydraulic cylinder is connected to a link mechanism, a seedling planting device is attached to the traveling machine using this link mechanism so that it can be driven up and down, and the link mechanism and a control valve for the hydraulic cylinder are mechanically interlocked. The device is interlocked and connected via a mechanism, and the control valve is automatically operated to return from the raised position to the neutral position when the seedling planting device is raised beyond a setting by the upward driving force of the seedling planting device. The present invention relates to a mounting structure for a seedling planting device of a rice transplanter.

In the conventional system mentioned above, the load change on the seedling planting device side is not considered at all, and even though the cylinder has reached the stroke end, the valve is not returned to the neutral position, and the valve is not returned to the neutral position when the stroke end is reached. The cylinder may be damaged due to a collision,
There are problems such as pressure oil being relieved more than necessary, resulting in power loss.Also, when in the relief state, the seedling planting device is subjected to vibrations due to turning, etc., which causes the seedling planting device to fail. There were problems such as descending.

In view of the above points, it is an object of the present invention to make it possible to reliably avoid the occurrence of the above problems regardless of load changes on the seedling planting device side.

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

A seedling planting device 5 is interlocked and connected to the rear of a traveling vehicle body in which wheels 1 are mounted on front and rear wheels, and a control section 2 is arranged, through a link mechanism 3 and a single-acting hydraulic cylinder 4 so that the seedling planting device 5 can be driven up and down. , is configured as a riding rice transplanter.

A center float 6a of the floats 6 pivotally connected to the lower part of the seedling planting device 5 is provided so as to be movable up and down while biased toward the downward displacement side, and based on the up and down displacement with respect to the seedling planting device 5. It also serves as a ground sensor for detecting the level of the seedling planting device 5 with respect to the planting mud surface, and the front bent link 7 of the center float 6a and the control valve V for the cylinder 4 are interlocked and connected. , the control valve V is automatically operated based on the vertical displacement of the center float 6a with respect to the seedling planting device 5, and the level of the seedling planting device 5 relative to the planting mud surface is maintained within a set range. be.

The hydraulic cylinder 4 is provided by having a cylindrical member 10 pivotally connected to a frame 9 connected to an upper link 8 constituting the link mechanism 3, and a rod tip of the hydraulic cylinder 4 having a bottom side pivotally connected to the fuselage. The side is connected to the cylindrical member 10 in a slidable manner and with a coil spring 11 interposed therebetween, thereby preventing impactful transmission of machine body vibrations to the seedling planting device 5 side and the hydraulic cylinder 4 caused by these vibrations. A buffer mechanism 12 is interposed to suppress the transmission of impact force to.

A manual operation lever 13 is connected to the control valve V so that the seedling planting device 5 can only be forcibly raised and fixed at a neutral position.
is provided, and the seedling planting device 5 is configured to be able to be raised to a position within the distance from the ground and maintained fixed in that raised state, regardless of the above-mentioned automatic elevation control, when changing direction at the edge of a rice field or traveling on the road. It has been done.

Lower link 14 configuring the link mechanism 3
and the operating lever 13, and one end side is connected to the lever 13.
From a rod 15 which is pivotally connected to the plate-like member 13a connected to the side and whose other end is slidably attached to the lower link 14 side, and an abutment member (abutment part) 16 attached to the rod 15. Mechanical interlocking mechanism 1 consisting of
7, and as mentioned above, when raising the seedling planting device 5, the operating lever 13 is forcibly and automatically moved to the neutral position as the seedling planting device 5 rises above the set value. It is configured such that the raising of the seedling planting device 5 can be automatically stopped by performing a return operation.

To operatively connect the rod 15 to the lower link 14, a cylindrical body 18 having a length of at least five times the diameter of the rod 15 is rotatably connected to the lower link 14, and the rod 15 is slidably connected to the cylindrical body 18. Freely rod 1
5 is inserted into the rod insertion hole 19 of the cylindrical body 18.
The circumferential edges of both ends are tapered to allow relative displacement between the rod 15 and the cylindrical body 18 to be performed smoothly without twisting while applying a good rotational force to the cylindrical body 18. There is.

The abutment member 16 is attached to the rod 15 so as to be able to adjust its fixed position in order to absorb assembly errors, etc., and when the abutment member 16 is fixed to the rod 15, the seedlings of the seedling planting device 5 are attached. As well as fully placing pine-shaped seedlings on the mounting table 5a, we anticipate that mud will adhere to it as a result of the planting work, and in this state, calculate the maximum load that will be applied from the seedling planting device 5 to the buffer mechanism 12. The amount of deflection displacement of the coil spring 11 in the buffer mechanism 12 is calculated based on the set load that is greater than the maximum load, and the maximum lifting position of the seedling planting device 5 is calculated, and the hydraulic cylinder 4 is stroked at the maximum lifting position. It is configured so that the operating lever 13 can be returned to the neutral position without reaching the end.

In summary, the present invention provides the above-mentioned seedling planting device mounting structure for a rice transplanter, in which the mechanical interlocking mechanism 17 is configured to control the change in relative posture of the link mechanism 3 with respect to the traveling machine at its maximum rising posture. A contact portion 16 is provided that detects by contacting with the link mechanism 3, and the detection action position of the contact portion 16 with respect to the link mechanism 3 can be set and changed by the direction in which the link mechanism 3 moves up and down. It is characterized by being configured as follows.

In other words, the amount of pine-shaped seedlings placed on the seedling stand 5a changes as it is used, and when the pine-shaped seedlings are fully placed, the weight of the seedling planting device 5 is at its maximum, and the buffer As the load applied to the mechanism 12 increases, the shock absorbing mechanism 12 is displaced greatly for cushioning, and the maximum lifting position of the seedling planting device 5 at the stroke end of the cylinder 4 becomes low. Considering the set load that is higher than the load applied to the buffer mechanism 12 when full of seedlings are placed on the seedling platform 5a, the link mechanism 3 is set at the maximum raised position of the seedling planting device 5 based on the set load. The position of the abutting part 16 relative to the link mechanism 3 is set so that the abutting part 16 is in contact with the link mechanism 3, and the control valve V is returned to the neutral position. Regardless of weight changes such as changes in the amount of seedlings loaded on the stand 5a, the operation can be reliably stopped before the hydraulic cylinder 4 reaches the stroke end, preventing impact damage at the stroke end of the cylinder 4 and unnecessary relief. We were able to definitely avoid this problem.

[Brief explanation of drawings]

The drawings show an embodiment of the attachment structure for the seedling planting device of the rice transplanter according to the present invention, and FIG. 1 is an overall side view of the rice transplanter, and FIG. 2 is a partial diagram showing the linkage structure between the hydraulic cylinder and the upper link. FIG. 3 is a partially cutaway side view showing the linkage structure between the lower link and the lever. 4... Hydraulic cylinder, 5... Seedling planting device, 5a
... Seedling stand, 12 ... Buffer mechanism, 16 ... Contact portion, 17 ... Mechanical interlocking mechanism, V ... Control valve.

Claims (1)

[Claims] 1 Single acting hydraulic cylinder 4 via buffer mechanism 12
and a link mechanism 3, and using this link mechanism 3, a seedling planting device 5 is attached to the traveling machine so that it can be driven up and down, and the link mechanism 3 and the hydraulic cylinder 4 are connected to each other.
A control valve V for the seedling planting device 5 is interlocked and connected via a mechanical interlocking mechanism 17.
The seedling planting device of the rice transplanter is configured to automatically return the control valve V from the raised position to the neutral position when the seedling planting device 5 is raised above a setting by a rising driving force of In the mounting structure, the mechanical interlocking mechanism 17 includes an abutment part 16 that detects a change in the relative attitude of the linkage mechanism 3 with respect to the traveling aircraft at its maximum rising attitude by coming into contact with the linkage mechanism 3. Seedling planting of a rice transplanter, characterized in that the detection action position of the contact portion 16 with respect to the link mechanism 3 is configured to be changeable according to the direction in which the link mechanism 3 moves up and down. Device mounting structure.