JPS583445Y2 - Wheel lifting device in rice transplanter - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wheel lifting device for a rice transplanter.

This invention is a rice transplanter that is configured to have a hydraulic system installed at the front of the machine and operate the hydraulic system via a switching valve to raise and lower the wheels, and a neutral return mechanism of the switching valve is connected to the hydraulic cylinder. , the neutral return mechanism and the switching valve are connected via a switching link mechanism, and a lift sensing device that comes into contact with a float provided at the bottom of the rice transplanter's body to sense the lifting and lowering movement of the float; By connecting the neutral return mechanism via a spring, the instructions from the neutral return mechanism are prioritized over the instructions from the elevation sensing device for the switching valve.
Another purpose is to prevent excessive load from being applied between the sensing device and the neutral return mechanism.

To explain the embodiment shown in the drawings, A is the main body of the rice transplanter, in which an engine 2 is mounted on the front part of the machine base 1, and a seedling loading stand 3 with a low front and rear height is provided at the rear. A seedling planting section 4 is provided at the lower part of the fuselage 3, wheels 5 are provided at the center, a center float 6 is provided at the center of the lower part of the body, and side floats 7 and 7 are provided on both sides of the center float 6.

C is a hydraulic device installed at the front of the machine base 1, in which the piston rod 9 of the single-acting hydraulic cylinder 8 is fixed to the machine base 1, and the cylinder 8 itself slides forward when hydraulic pressure is applied. It is.

The sliding movement in the backward and forward directions is caused by external force from the wheels 5.

10 is a link mechanism for lifting and lowering the wheels 5, and a cylinder 8
One end of a rod 11 is connected to the transmission case, the other end of the rod 11 is connected to one end of a single-shaped lever 12 pivotally connected to the transmission case, and the other end of the same-shaped lever 12 is connected to the axle case 13. They are connected via a connecting rod 14.

The wheel case 13 has its base end pivotally connected to the machine base 1, and has a wheel 5 at its tip.The wheel case 13 can be moved up and down by the forward and backward sliding movement of the hydraulic cylinder 8 via the elevating link mechanism 10.

15 is a negative pressure countermeasure spring provided at one end of the hydraulic cylinder 8; 16 is a front-rear sliding switching valve of the hydraulic cylinder 8;
It is connected to one end of a horizontal rod 17, and a hand priority link mechanism 18 is connected to the other end of the horizontal rod 17.

The same-hand priority link mechanism 18 connects the other end of the horizontal rod 17 and one end of an L-shaped rod 19 pivotally connected to the fuselage via a horizontal connecting rod 20, and connects the other end of the horizontal rod 19 with a hand lever. 21 side arm 22
and are connected via a vertical rod 23.

17' is a pivot pin of the horizontal rod 17, 24 is a switching valve neutral return mechanism, and the hydraulic cylinder 8 is provided with a flange 8'.
The actuating rod 25 is passed through the actuating rod 25, locking bodies 26, 27 are provided at the tip and middle of the actuating rod 25, and the flange 8' is positioned between the locking bodies 26, 27.

A switching link mechanism 28 is connected to the other end of the operating rod 25.

The switching link mechanism 28 is provided with a pivot shaft 29 on the machine base 1, an L-shaped horizontal bar 30 is pivotally supported on the pivot shaft 29 via a boss 30', and one end of the L-shaped horizontal bar 30 is provided with the above-mentioned operation. The other end of the rod 25 is connected to the other end of the L-shaped horizontal rod 30 and the pivot pin 17 of the horizontal rod 17.
The tip of a horizontal arm 31 provided at `` is connected to the tip of a horizontal arm 31 via a vertical rod 32.

Further, numeral 33 is an arm piece that is integrally connected to the above-mentioned cross-shaped horizontal rod 30 via a boss 30', and is interlocked with the operating rod 25.

Reference numeral 34 denotes a lift sensing device, in which a roller 36 is pivotally supported at the tip of a moving rod 35 whose base end is pivotally supported on the pivot shaft 29, and a torsion spring S provided at a base end boss 35' of the moving rod 35. The roller 36 is configured so that it can come into contact with the tip of the center float 6, and the above-mentioned moving rod 3
An arm piece 33' is integrally connected to the proximal end boss 35' of No. 5, and the arm piece 33' and the arm piece 33 are opposed to each other via a spring 37 having a certain counter pressure.

Reference numeral 38 denotes a connecting pin inserted through the same thread 37, which connects the arm piece 3.
3.33'.

In addition, 39 is a hydraulic pump, and 40 is a buffer cylinder with a built-in spring.

Therefore, when the wheel 5 reaches a concave part due to the unevenness of the tiller while traveling during rice planting work, the float 6 rises relative to the descent of the machine body, moving the moving rod 25 from the solid line position in FIG. Raise and rotate to line position.

The arm piece 33', which is integrally connected to the same-motion rod 35 at the end of the temple, acts to bring the other arm piece 33 closer to the other arm piece 33.
The other arm piece 3 without approaching due to the constant resistance pressure of 7.
3 to rotate.

The rotation of the arm piece 33 causes the switching valve 16 to slide in the direction of arrow a via the switching link mechanism 28 (see Fig. 4), and the cylinder 8 is slid forward by the hydraulic pressure from the hydraulic pump 39. Then, the wheel is lowered to follow the recessed portion via an elevating link mechanism 10 connected to the cylinder 8.

At this time, as the hydraulic cylinder 8 slides forward, the flange 8' comes into contact with and presses against the locking body 26 to operate the operating rod 25, and the L-shaped horizontal rod connected to the operating rod 25 3
The switching valve 1 is connected to the vertical rod 32 connected to the horizontal rod 30 of
6 returns to neutral.

In this way, the hydraulic cylinder 8 slides via the neutral return mechanism 24 and the switching link mechanism 28 until the switching valve 16 is returned to the neutral position. This is to stop the descent.

In addition, since the neutral return mechanism 24 at this time is connected to the elevation sensing device 34 via the spring 37, there is no risk that the operation of the neutral return mechanism 24 will be absorbed by the spring 37 and interlock with the elevation sensing device 34, and the neutral state will be returned to neutral. The return mechanism 24 can be operated preferentially, and furthermore, the return mechanism 24 can be operated without applying any load to the elevation sensing device 24.

That is, the arm piece 33 that is interlocked with the operating rod 25 which is activated by pressing the locking body 26 by the flange 8' rotates against the spring 37 due to the pressing force, and the arm piece 33' opposite to the arm piece 33 rotates. There is an idle motion between the arms 33', and the movement can be performed without applying any load to the elevation sensing device 34 connected to the arm piece 33'.

In cases where the recess is small, etc., it is necessary to return the switching valve 16 to the neutral position during forward sliding of the hydraulic cylinder, and in that case, the switching valve 16 is returned to the neutral position by the hand priority link mechanism 18. , by rotating the hand lever 21 in the direction of the arrow and sliding the switching valve 16 in the opposite direction of the arrow a via the link mechanism 18, the switching valve 16 can be returned to the neutral position.

At this time, the hand priority mechanism 18 is interlocked with the neutral return link mechanism 24 and does not operate the operating rod 25, but since the operating direction is the same as the sliding direction of the hydraulic cylinder 8, there is no problem. Since the lift sensing device 34 is connected to the spring 37, the hand priority link mechanism 1
8 is absorbed by the spring 37 and there is no risk of interlocking with the sensing device 34, and no load is applied to the sensing device 34.

Also, in the opposite case to the above case, when the wheel 5 reaches the convex part, the float 6 is relatively lowered, and the switching valve 16 is moved in the opposite direction to the arrow a direction via the sensing device 34 and the switching link mechanism 28. The hydraulic path is opened by sliding it in the direction.

Therefore, the lifting of the wheels 5 applies an external force to the hydraulic cylinder 8 via the elevating link mechanism 10, causing the cylinder 8 to slide rearward.

At this time, the neutral return mechanism 24 and the elevation sensing device 34 are interlocked by a pin 38 connecting the arm pieces 33, 33', but the elevation sensing device 34 operates in the direction away from the float 6, so the sensing device 34 It does not impose any load on the

Furthermore, even when the hand priority link mechanism 18 is activated to return the switching valve to neutral, the sensing device 34 that is linked to the link mechanism 18 operates in the direction away from the float 6, so a load is applied to the sensing device 34. There is no danger.

Since the present invention is constructed as described above, the positional relationship between the wheels and the float can be maintained accurately depending on the condition of the tiller, and the operation of the neutral return mechanism is absorbed by the spring, causing a load on the elevation sensing device. In addition, there is no risk of causing damage to the switching valve, and the instruction from the neutral return mechanism can be prioritized over the instruction from the lifting/lowering sensing device, so that the wheel lifting device can operate smoothly.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing the wheel lifting device of the rice transplanter of the present invention, Fig. 2 is an enlarged side view of the main part, Fig. 3 is a plan view of the same, and Fig. 4 is an explanatory diagram of the system. A: Rice transplanter body, 5: Wheels, 6: Center float, 8
: Hydraulic cylinder, 10: Elevating link mechanism, 16: Switching valve, 18: Hand priority link mechanism, 24: Neutral return mechanism,
28: Switching link mechanism, 34: Lift sensing device, 37: Spring.

Claims (1)

[Scope of utility model registration request] At the front of the aircraft, a hydraulic system is installed in which the piston rod of the hydraulic cylinder is fixed to the machine base, and the hydraulic cylinder itself moves due to hydraulic operation, and the wheels connected to the hydraulic cylinder move up and down. A switching valve for performing hydraulic switching operation is connected to the hydraulic cylinder, and the switching valve is configured to operate by sensing the rise and fall of a float installed below the aircraft body. In a rice transplanter that raises and lowers the wheels by operating the float, a neutral return mechanism is connected to the hydraulic cylinder to return the actuated switching valve to the neutral position by sensing the float going up and down. Instead of being connected to the switching valve via a switching link mechanism, the neutral return mechanism and an up/down sensing device that senses the up/down movement of the float are connected through a spring to trigger the operation of the neutral return mechanism. A wheel lifting device for a rice transplanter, which is configured to prevent interlocking of a lifting sensing device by absorbing the movement.