JPS645463Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an invention regarding a swing device for the wheels of a rice transplanter.

The main purpose of rice transplanters is to run in rice fields with many uneven surfaces, rather than on flat roads. Even if the rice paddy tiller is uneven, the float and planting section cannot be tilted left or right, and the wheels must always be in contact with the tiller to obtain propulsion. In order to be able to move independently from the drive device, a swing device is provided to always urge the tiller toward the tiller, and is configured to be able to swing according to the unevenness of the tiller.

Conventional rice transplanters were biased by a spring and simply swung according to the unevenness of the tiller, but recently, the unevenness of the tiller is sensed by a sensor rod attached to a float, and the sensor rod A method is used in which a hydraulic directional control valve is activated to expand and contract a hydraulic cylinder, and the wheels are swung by the hydraulic pressure.

When swinging the wheel using this hydraulic pressure, the present invention is designed to prevent the unevenness of the plowing plate in paddy fields from being too large and causing excessive movement of the float and planting part, which would worsen the planting posture of the seedlings. The swing width can be adjusted to be larger or smaller depending on the condition of the tiller, and it is possible to perform the best swing depending on the unevenness of the tiller.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a side view showing a wheel swing device section of a walk-behind rice transplanter. Figure 2 is a plan view with only the wheel swing device taken out, Figure 3 is a side view,
FIG. 4 is a sectional view of the hydraulic cylinder section.

The walk-behind rice transplanter has an engine 8 and a transmission case 30 mounted integrally on the front part of the float 3, and a planting drive transmission case 31 mounted on the rear part of the float 3. They are connected by a drive shaft, etc., and power is transmitted. Planting drive transmission case 31
A seedling stand 4 is placed on the top so as to be slidable from side to side, and a handle 15 is provided to protrude rearward parallel to the stand 4. 6 is a planting claw device, and 7 is a preliminary seedling stand.

The swing wheels 1, 1 are suspended from the side of the float into the rice field, and are supported by an axle at the rear end of the swing case 2. The tip of the swing case 2 is pivotally supported by a power shaft protruding from the side surface of the mission case 30, and is configured to be able to freely move up and down while transmitting power. The swing wheel 1 is connected to a swing arm 10 by a link 9 at the upper part of the rear end of the swing case 2. The swing arm 10 is integrally constructed and pivotally supported with the swing arm 11, and the swing spring 1 is supported by a link 12 pivotally connected to the tip of the swing arm 11.
It is connected to the tip of 4.

The swing spring 14 and the swing auxiliary springs 13, 13 can handle small irregularities on the paddy tiller.
Since the vertical vibration of the swing wheel 1 is absorbed, it can swing freely, and due to the large irregularities of the paddy tiller,
When the swing wheel does not reach the tiller or sways, the sensor rod 17 detects an abnormal rise of the float 3, causes the ram 15 in the cylinder 16 to protrude, and moves the link 15 together with the swing spring 14 to the protruding side. , which causes the swing wheel to protrude. On the other hand, if the tiller is abnormally elevated, the float 3 descends, the sensor rod 17 reduces the ram 15 in the tension cylinder 16, and the link 15
is moved to the contraction side together with the swing spring 14, and the swing wheel 1 is retracted.

The hydraulic pump and the hydraulic directional control valve are housed inside the transmission case 30, and the vertical movement of the sensor rod 17 rotates the valve arm 22 via the sensor arm 20 and the sensor link 21. The valve arm 22 operates the hydraulic directional control valve.

Furthermore, a remote control wire 32 is connected to the sensor arm 20 through a manual control lever for the swing wheel provided on the handle, so that the wheel can also be swung manually. Particularly when turning around at the edge of a field, it is necessary to lower the swing wheels all the way down to float the aircraft to reduce the resistance of the mud to the rotation. A separate mechanism is also provided to lock the rolling of the left and right swing wheels.

Hydraulic oil whose direction is controlled by a hydraulic directional control valve enters the cylinder 16 from the front end of the cylinder 16 through an oil feed pipe 18, and return oil flows through a return oil pipe 19.
Return to the mission case.

FIG. 4 shows the detailed structure of the hydraulic cylinder section.

The hydraulic cylinder 16 is welded and fixed to the cylinder base 26, and the ram 15 is slidably inserted therein. An opening 15a is formed at the end of the ram 15 in the axial direction of the ram, and an oil hole 15b returns to the inner end side and penetrates toward the outer circumference of the ram 15. When the ram 15 is pushed by the hydraulic oil sent from the oil pipe 18 and moves to the left, the hydraulic oil outlet 26b of the cylinder base 26 and the ram 1
The return oil holes 15b of No. 5 coincide with each other, and the hydraulic oil escapes to the return oil pipe 19. Hydraulic oil outlets 26b and 26
The valves a are provided at intervals within the cylinder base 26, and valves 24 and 25 are respectively provided to be openable and closable.

In the state of the valves shown in FIG. 4, the valve 24 is open and the valve 25 is closed, so the ram stops at the hydraulic oil outlet 26b and the swing amount of the wheel becomes small. Conversely, close valve 24 and close valve 25.
When opened, the ram moves to the position of the hydraulic oil outlet 26a, so the amount of swing of the swing wheel increases.

As described above, the present invention is configured to change the stroke of the ram and increase or decrease the swing width of the swing wheel by providing multiple hydraulic oil outlets from the hydraulic cylinder that adjusts the amount of swing of the wheel. Since the swing width can be changed according to the degree of unevenness of the board, the swing width will not be too small or too large, and you can obtain a swing that matches each paddy field. The ram stroke was set short and the maximum amount of wheel protrusion was kept small, making driving easier when driving on the road.

[Brief explanation of the drawing]

Figure 1 is a side view showing the wheel swing device of a walk-behind rice transplanter, Figure 2 is a plan view showing only the wheel swing device, Figure 3 is a side view, and Figure 4 is a sectional view of the hydraulic cylinder. It is. 1... Swing wheel, 15... Ram, 16...
Cylinder, 26... Cylinder base, 26a,
26b...Hydraulic oil outlet.

Claims (1)

[Scope of utility model registration request] A wheel swing for a rice transplanter, characterized in that the swing width of the swing wheel is increased or decreased by changing the stroke of the ram by providing a plurality of hydraulic oil outlets from a hydraulic cylinder that adjusts the amount of swing of the swing wheel. Device.