JPH0258892B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention links a sensor float equipped in a seedling planting device with a seedling planting device lifting mechanism, so that the ground load acting on the sensor float is equal to the set load. The present invention relates to a rice transplanter configured to control the operation of the elevating mechanism based on fluctuations in the float ground load so that the float ground load is maintained, and more particularly, it relates to a technique for adjusting the ground load.

[Conventional technology]

Conventionally, Japanese Patent Application Laid-Open No. 169405 (1983) was used as a technique for adjusting the ground load in a rice transplanter configured as described above.
In this conventional example, when the traveling gear is operated at high speed, the ground contact load is increased to make the control sensitivity insensitive, and when the traveling gear is operated at low speed, the ground contact load is decreased. It is configured to make the control sensitivity sensitive.

[Problem to be solved by the invention]

Now, considering this conventional example, in this conventional example, the ground load is changed in conjunction with the traveling speed of the aircraft, so when the traveling speed is set high, frequent lifting control is required, and the generation of floating seedlings is suppressed. At the same time, it has the aspect of exhibiting good operation in that it can perform reasonable control even when driving at low speeds.

However, when considering the conditions of the field where seedlings are to be planted, if the mud in the field is hard, even if the sensor float comes into contact with the surface of the mud, the mud will not be easily crushed. Sometimes the sensor float tends to move up and down frequently, and if the mud in the field is soft, the mud is easily crushed by contact with the sensor float. This causes a phenomenon in which the vertical movement of the float slows down, causing frequent lifting and lowering movements in the former field condition, and slow lifting and lowering movements in the latter field condition.

For these reasons, it is desirable to be able to adjust the ground load of the sensor float even when planting seedlings by running the aircraft at a fixed speed, but in the conventional example, the ground contact load is only linked to the running speed. There is room for improvement as the load is changed.

The purpose of the present invention is to
The purpose is to rationally configure a rice transplanter that can transplant seedlings easily and well regardless of the hardness or softness of the field.

[Means to solve the problem]

As described at the beginning, the present invention is characterized in that a rice transplanter that raises and lowers a seedling planting device based on variations in the ground load of a sensor float is provided with an artificial setting means for arbitrarily setting the ground load, and this artificial setting The present invention includes automatic setting means for increasing the ground contact load as the traveling speed changing means is adjusted to the higher speed side regardless of the set value of the means, and its functions and effects are as follows.

[Effect]

In other words, in the present invention, when the mud in the field where seedlings are to be planted is hard, the ground load is increased by artificial setting means to promote crushing of the mud by the sensor float. If the soil is soft, it is possible to reduce the ground load by artificially setting means to suppress the crushing of mud by the sensor float, and when driving, it takes priority over the artificially set value. do,
Since the ground load linked to the running speed is automatically set, frequent elevation control can be suppressed even when the vehicle is running at high speed.

〔Effect of the invention〕

Therefore, regardless of the traveling speed of the machine or the hardness or softness of the field, the rice transplanter has been rationally constructed so that the sensor float can move up and down appropriately and can transplant seedlings easily and well. be.

〔Example〕

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

As shown in FIG. 1, an engine 4 is mounted on the front part of a vehicle body frame 3, which is equipped with a pair of left and right rear propulsion wheels 1 and a pair of left and right front propulsion wheels 2 for steering operation, and a boarding and driving section 6 is mounted in the center. In addition to providing
An inclined seedling platform 6 that carries pine-shaped seedlings W and moves back and forth horizontally with a constant stroke, and eight seedlings in which seedlings are taken out one by one from the bottom end of the seedling platform 6 and planted on the mud surface. A seedling planting device 10 equipped with an attached claw 7 . . . and a plurality of floats 8 , 9 . The rice transplanter is connected to the vehicle body so that it can be raised and lowered, and is used to construct a riding rice transplanter that can plant 8 rows.

As shown in FIG.
is attached to the seedling planting device 10 so as to be able to swing up and down,
A link mechanism 13 is provided at the front end of the sensor float 8.
is attached so that it can be bent and extended.

The seedling planting device elevating mechanism 14 that raises and lowers the seedling planting device 10 includes a hydraulic valve 15 that drives the hydraulic cylinder 12, and a spool 15 of this hydraulic valve 15.
A cylinder body 16a is loosely fitted onto the rotation shaft 16 and has a cam C at its end, and an operating lever 17 is fixed to the cylinder body 16a. The oil passage of the spool 15a of 15 is inserted through the hydraulic cylinder 12 so that the seedling planting device 10 is raised when the spool 15a is operated in the insertion direction, and the seedling planting device 10 is lowered when the spool 15a is operated in the withdrawal direction. ing.

Then, the operating lever 17 is moved to the lever guide 1.
By being locked at the U position of 8, the spool 15a is operated in the insertion direction by the contact of the cam C at the end of the cylinder 16a, and the seedling planting device 10 is forcibly raised. Lever 17 is lever guide 1
By being locked at the N position of the lever guide 18, the lowering of the planting device 10 is restricted, and by being locked at the A position via the lever guide 18, the lever 17 is locked at the A position. The movement of the spool 15a which had been restricted by C is released, and the arm 19 fixed to the rotation shaft 16 and the link mechanism 1
Through the wire 20 disposed across the float-side link 18a of No. 3, fluctuations in the ground load of the sensor float 8 are transmitted to the arm 19, which causes the seedling planting device to follow the unevenness of the mud surface. 10 is configured to be automatically raised and lowered.

Further, the grounding load of the sensor float 8 is adjusted by springs 21 and 22 arranged in parallel with the link 13a, and one spring 21 is connected to a lever 24 via a wire 23.
The other spring 22 is connected via a wire 25 to a tensioner for effective adjustment of a pulley of a belt-type continuously variable transmission 26 installed between the engine output shaft 4a and the transmission input shaft 32. It is linked and connected to the arm 27.

Also, by locking and fixing the lever 24 to a plurality of locking grooves formed in the lever guide 28,
The biasing force of the spring 21 is changed, the set ground load of the sensor float 8 is adjusted, and the operating arm 27 of the continuously variable transmission is moved from the gear shift operating lever 2.
9, and the continuously variable transmission 26 is connected to the high speed side H.
When operated, the wire 25 is pulled, the biasing force of the spring 22 is increased, and the sensor float 8 is
Ground load is increasing. In other words,
The ground load of sensor float 8 is spring 2
1 and 22, and can be adjusted arbitrarily by operating a lever 24, or automatically when the traveling speed of the aircraft changes. In other words, in this embodiment, the gear shift operation lever 29
The system from the lever 24 to the wire 25 corresponds to automatic setting means, and the system from lever 24 to wire 23 corresponds to manual setting means.

[Another example]

FIG. 3 shows another embodiment of the present invention, in which the sensor float 8, link mechanism 13,
Although the wire 20 and the raising/lowering mechanism 14 of the seedling planting device are provided, only one spring 21 is provided on the sensor float 8, and the wire 30 for moving and operating the outer wire end 23a of the wire 23 is connected to the engine. It differs in that it is linked and connected to the gear change operation lever 29 that operates the accelerator device 31 of No. 4,
Another difference is that the set load of the sensor float 8 can be adjusted arbitrarily by operating the lever 24, and the ground load of the sensor float 8 can be adjusted automatically according to the traveling speed of the aircraft. It has become something that does not exist. In this alternative embodiment, the system from the gear shift operation lever 29 to the wire 30 corresponds to automatic setting means, and the system from lever 24 to wire 23 corresponds to manual setting means.

[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, Fig. 2 is a schematic side view showing the lifting and lowering operation structure of the seedling planting device, and Fig. 3 is the lifting and lowering operation structure of the seedling planting device. It is a schematic side view which shows another Example. 4...Engine, 8...Sensor float, 1
0... Seedling planting device, 14... Seedling planting device lifting mechanism, 31... Accelerator device.

Claims (1)

[Scope of Claims] 1. The sensor float 8 installed in the seedling planting device 10 and the seedling planting device lifting mechanism 14 are linked, and the float is connected so that the ground load acting on the sensor float 8 is maintained at a set load. The rice transplanter is configured to control the operation of the elevating mechanism 14 based on ground load fluctuations, and is provided with an artificial setting means for arbitrarily setting the ground load, and the rice transplanter does not run regardless of the setting value of the artificial setting means. A rice transplanter comprising automatic setting means for increasing the ground load as the speed changing means is adjusted to a higher speed side. 2. The rice transplanter according to claim 1, wherein the traveling speed changing means operates an accelerator device 31 of the installed engine 4.