JPH0220907Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a common support shaft that supports three or more floats arranged in parallel in the left and right direction so as to be able to move up and down. This invention relates to a float mounting structure for a rice transplanter that is inserted and held across a bracket.

In the conventional float mounting structure, the spindle insertion portions of each of the mounting brackets were provided at the same level, and the spindles were inserted and held in a straight line through these brackets. There were flaws.

That is, in this type of rice transplanter, the mounting bracket located at the center is attached to a frame part with high mechanical strength, such as a handle frame, and on the other hand,
Because the mounting brackets located on both the left and right sides are attached to cantilevered arms extending from the frame, when the float receives ground reaction force,
Due to the bending and deformation of the arm, the shaft insertion position of the left and right mounting brackets is inevitably displaced upward, resulting in variations in planting depth in the left and right direction.

Furthermore, because there is a gap between the insertion part of each mounting bracket and the support shaft due to manufacturing tolerances and differences between the two, the common support shaft is susceptible to engine vibrations, running vibrations, etc. It resonates and not only contributes to noise generation but also tends to have an adverse effect on the leveling of the ground.

The object of the present invention is to improve the above-mentioned drawbacks of the prior art through a rational modification between the mounting bracket and the support shaft.

A characteristic configuration of the rice transplanter float mounting structure according to the present invention, which has been made to achieve such an object, is that the spindle insertion portions of the left and right mounting brackets are located lower than the spindle insertion portion of the center mounting bracket. The support shaft is inserted and held in a bent state through these brackets.

The functions and effects of the above characteristic configuration are as follows.

<Function> Since the common support shaft is inserted into the mounting bracket on the fuselage side and held in a bent state with both left and right sides positioned below the center, both of them are subject to manufacturing tolerances and manufacturing errors. In addition to being able to be assembled without any play,
When the mounting brackets located on both the left and right sides are displaced upward in response to the float ground reaction force, the common support shaft can be restored to its original horizontal or nearly horizontal state.

<Effect> Therefore, by simply and economically modifying the mounting position of the mounting bracket as described above, each float can be firmly grounded and the planting depth in the left and right direction can be made uniform. Not only is this possible, but it has also become possible to prevent the vibration of the common support shaft, which causes noise generation and poor ground leveling.

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

The walking-type rice transplanter shown in Fig. 1 is constructed by having an engine 2 and a transmission case 3 connected in series to the front end of a main frame 1 made of a round pipe placed at the center of the left and right sides of the machine. At the rear of 1, a seedling planting device 4 for planting 4 rows and a control handle 5 are connected. Further, a central grounding float 6 is provided below the aircraft body, extending from the bottom of the engine 2 to the bottom of the seedling planting device 4, and below the seedling planting device 4, a pair of left and right rear grounding floats 7, 7 are provided. It is deployed.

On the left and right sides of the transmission case 3, there are wheel transmission cases 8, which are vertically swingable about the fulcrum.
8 extends rearward, and propulsion wheels 9, 9 are attached to the rear ends, respectively.

The propulsion wheels 9, 9 are configured to be driven up and down simultaneously in the same direction as a hydraulic cylinder 10 provided on the main frame 1 expands and contracts, and also to be able to go up and down in opposite directions.

The rear mounting structure of each of the floats 6, 7, 7 is constructed as follows.

As shown in FIGS. 2 and 3, arms 13, 13 are components of the seedling planting device 4, and extend rearward from side cases 12, 12, which are connected to the left and right sides of the feed case 11. , this arm 1
Mounting brackets 15, 15 are mounted on the tips of the handles 3 and 13 and on both left and right sides of the control handle 5 which is fixedly connected to the feed case 11. and 16, 16 are fixed.

Each of the floats 6, 7, of the common support shaft 14
Arms 17 that protrude forward are fixed to locations corresponding to the arms 1 and 7, respectively.
A bracket 18 attached to the rear of each of the floats 6, 7, and 7 is pivotally connected to the tip of the float 7, and there is a planting depth between the common support shaft 14 and the control handle 5. An adjustment mechanism 19 is provided.

In other words, the arm 13,
13 is deflected upward due to the float ground reaction force, the central mounting brackets 16, 16
These brackets 15, 15,
The common support shaft 14 is inserted into and held in the bent shape of a chevron.

Further, as shown in FIG. 4, a crankshaft 2 is located within the feed case 11 at a position displaced to the left or right with respect to the center line of the width of the central float 6.
0 drive sprocket 21 is provided, and a recess 11a as large as possible is formed in the center of the width of the feed case 11, and within this recess 11a, a recess 11a is formed in the center of the width of the central float 6. The convex portion 6a is disposed inwardly.

The hydraulic cylinder 10 for lifting and lowering the wheels can be controlled automatically and manually, and its concrete structure is as follows.

As shown in FIG.
A three-position switching type control valve 22 provided in the hydraulic cylinder 10 is connected to the hydraulic cylinder 10 by piping.

When the spool 22A of this control valve 22 is pulled out rearward, the hydraulic cylinder 10 is extended and the wheels 9 are lowered, and conversely, the spool 22A is pulled out.
When the wheel is pushed forward, the hydraulic cylinder 10 is contracted and the wheels 9, 9 are raised.

Further, a vertical swing link 23 and a downward arm 24 are pivotally connected to the mission case 3, and a push/pull link 25 is connected with a pin to the protruding end of the spool 22A. A pair of front and rear pins 26 and 27 implanted in the side surface of the link 25 are inserted into the vertical elongated hole 28 formed at the lower end of the swing link 23 and the longitudinal circular arc-shaped elongated hole 29 formed at the lower end of the downward arm 24, respectively. engaged.

A coil spring 32 is stretched between one end of a lever 31 attached to one side of a U-shaped bracket 30 fixed to the front upper surface of the main frame 1 so as to be swingable back and forth, and the upper end of the swing link 23. Due to the tension of the spring 32, the push/pull link 25 is elastically biased in the direction of pushing the spool 22A.

Further, a horizontal T-shaped link 33 connected to the central float 6 is fixed to the boss portion of the downward arm 24, and a tension force is applied between the lower end of the T-shaped link 33 and the rear end of the push/pull link 25. A T-shaped link 33 with a spring 34 tensioned and integrated
The downward arm 24 is urged to rotate clockwise relative to the push/pull link 25, and the pin 27 is urged against the front end of the elongated hole 29.

In the above-mentioned automobile wheel elevation control system, the ups and downs of the machine body due to changes in the depth of the tiller are sensed as changes in the ground pressure of the float 6, and the float 6 is vertically displaced relative to the machine body due to this ground pressure. Based on this, the control valve 22 is switched, and the wheels 9, 9 are controlled to move up and down in the opposite direction to the float displacement direction, so that the machine body is always maintained at a substantially constant level with respect to the rice field, and the planting depth is maintained. It becomes stable.

Further, the wheel lifting lever 35 and push/pull link 25 provided on the control handle 5, the main clutch lever 36, and the main clutch operating arm 37 provided on the transmission case 3 are connected to the release wire 3, respectively.
8 and 39, and a sleeve 40, which can be freely expanded and contracted with a screw, is fitted around the front end of an inner wire 39a that is a component of the release wire 39 on the main clutch side.

Then, the main clutch lever 36 is switched to the clutch release position, and the inner wire 39a
When the sleeve 40 is pulled rearward, the rear end of the sleeve 40 immediately comes into contact with the front surface of the upper end of the T-shaped link 33 in the controlled neutral position, and the T-shaped link 33 and the downward arm integrated therewith The length of the sleeve 40 is adjusted to prevent rotation of the sleeve 24 further clockwise.

By doing this, when the main clutch is disengaged to stop the machine in order to replenish seedlings in the field, even if the machine falls forward and the ground pressure of the float 6 increases, the spool 22A will switch to the wheel lowering position. No more getting caught.

Further, a connecting fitting 43 for an inner wire end fitting 42, which is a component of the release wire 38 of the manual lifting/lowering operation system, is attached to one end of the pin 41 fixed to the push/pull link 25 in a penetrating state. One end of the tension spring 34 is locked and held at the other end of the pin 41.

[Brief explanation of the drawing]

The drawings show an embodiment of the float mounting structure of the rice transplanter according to the present invention, and FIG. 1 is an overall side view of the walking rice transplanter, FIGS. 2 and 3 are a perspective view and an enlarged rear view of the float mounting part, FIG. 4 is a partially cutaway rear view of the seedling planting section, and FIG. 5 is a diagram of the elevation control system. 6, 7...Float, 14...Common support shaft, 1
5, 16...Mounting bracket.

Claims (1)

[Scope of utility model registration request] 3 or more floats 6 arranged in parallel in the left and right direction,
Float installation of a rice transplanter in which a common support shaft 14 supporting the rice transplanters 7, 7 in a vertically movable manner is inserted and held through three or more mounting brackets 15, 16, 15 arranged side by side in the horizontal direction on the machine body side. In the structure, the left and right mounting brackets 15, 15
The insertion portion of the support shaft 14 is located below the insertion portion of the support shaft 14 of the central mounting bracket 16, and these brackets 15, 16, 1
5 shows a float mounting structure for a rice transplanter, in which the support shaft 14 is inserted and held in a bent state.