JPS6312670Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention has a float supported on the underside of the aircraft body so as to be able to move up and down, and running wheels that are moved up and down by a hydraulic system installed on the aircraft body. The machine is equipped with an automatic elevating means that moves the running wheels up and down using a hydraulic device in response to ground pressure fluctuations acting on the float to raise and lower the aircraft with respect to the rice field. This invention relates to an improvement in a rice transplanter body lifting device that forcibly levitates the rice transplanter body when turning, etc., in a rice transplanter equipped with a hand-operated means for forcibly operating the wheels in the lowering direction.

[Prior Art] In the rice transplanter as described above, in order to prevent the float from pushing mud and creating unevenness when the machine body turns, it is necessary to raise the machine body rapidly.

[Problems to be solved by the invention] However, conventional rice transplanters of this type are equipped with automatic lifting means to keep the machine at a substantially constant level relative to the rice field during planting operations, so hydraulic pressure If the operating speed of the device is increased, there is a problem that the machine body moves up and down sensitively during the planting operation, making the operation unstable.

[Means for solving the problem] The present invention was made to solve the above-mentioned problem, and only when the aircraft is forced to levitate by the hand control operated during a turn, the wheels are lowered rapidly by the hydraulic system. To provide a machine lifting device that does not raise or lower the aircraft hypersensitively during planting work, but can quickly raise the aircraft to the surface when turning, etc., without any troublesome operations. The purpose is to

In order to achieve the above-mentioned object, the body flotation device of the present invention can be used in a walking rice transplanter as described above.
The oil passage and switching valve between the hydraulic cylinder and the oil tank of the hydraulic system are the same during automatic lifting and manual lowering using the hand operating means, and the flow rate of the pressure oil is controlled in conjunction with the operation of the hand operating means. It is characterized by being provided with a switching means for switching to a descending speed that makes the wheels go down rapidly.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates the body of a walking rice transplanter, and a float 2 is arranged below the body 1. The rear part of the float 2 is pivotally attached to the body 1 so as to be movable up and down, and the front part of the float 2 is connected to the body 1 via a link 3 so as to be movable up and down.
A pair of swing arms 4 are pivotally attached to the fuselage 1 on both the left and right sides so as to be tiltable up and down.
Left and right running wheels 5 are mounted on the free end side of the machine, and the wheels 5 are attached to a planting body 6 provided at the rear of the machine body 1.
At the same time, it is driven by an engine 7 provided at the front of the aircraft body 1.

The body 1 is provided with a hydraulic system 8, which, as shown in FIGS. 1 to 3, includes a hydraulic pump 9, a switching valve 10, a hydraulic cylinder 11, and a tank (not shown). The switching valve 10 is
The lower end is connected to a lift detection means 12 connected to the front part of the float 2, and the switching valve 10 is connected to a lift detection means 12 connected to the front part of the float 2, and the switching valve 10 is connected to a lift detection means 12 connected to the front part of the float 2.
The valve rest 13 is rotated to supply pressure oil to one end or the other end of the hydraulic cylinder 11 to advance or retract the piston 14 fitted into the cylinder 11, and connect the piston 14 to the piston 14 via the connecting means 15. When the ground pressure of the float 2 is high, the wheels 5 running on the plowing platform are moved downward, and when the ground pressure is low, the wheels 5 are moved downward. By biasing 5 in the upward direction, the aircraft 1 rises against the rice field.
The machine is lowered to maintain a substantially constant level, thereby regulating the planting of seedlings by the planting body 6 to a predetermined depth.

Note that the basic configuration and operation described above are the same as those of this type of conventional rice transplanter.

The fuselage lifting device of this embodiment has a handle 16 that extends diagonally rearward and upward from the rear end of the fuselage 1 behind the seedling tank 20, and an operating lever 18 serving as a hand-operated means.
An operating cable 19 connected to the lever 18 is connected to an arm 21 provided on the valve body 13 of the switching valve 10, and the cable 19, arm 21, and valve body 13 operate the aircraft lifting operation means 22. is configured. In addition, hand control lever 1
An operating cable 24 of an operating speed switching means 23 of the hydraulic system is connected to 8.
4 is connected to a shifter 27 of a clutch mechanism 26 via a link 25, as shown in FIGS.
Further, the rotation shaft 28 of the gear 17 of the hydraulic pump 9
An engager 29 that is slidably provided is engaged with the shifter 27, and furthermore, on both sides of the engager 29, a high-speed pulley 30 and a low-speed pulley 31 are connected to the rotating shaft 28.
The two pulleys 3 are rotatably supported on the
0 and 31 are constantly driven by the engine 7 via endless belts 32 and 33, and the link 25 is supported by a return spring 34.

Next, the operation of the aircraft lifting device configured as above will be explained. When the hand control lever 18 is not operated, the operation cables 19 and 24 are loosened, the switching valve 10 performs the automatic lifting operation during the planting work described above, and the hydraulic pump 9 is operated by the engager 29.
is engaged with the low-speed side pulley 31, so it is rotating at a low speed. Therefore, in this state, the traveling wheels 5 do not move up and down in response to the above-described ground pressure fluctuations of the float 2, that is, the body 1 does not rise or fall rapidly.

When turning, when the hand control lever 18 is rotated and the control cable 19 is pulled, the arm 21
The valve body 13 of the switching valve 10 rotates through the hydraulic cylinder 11 to supply pressure oil to the descending side of the traveling wheels 5, that is, the ascending side of the aircraft body 1, and forcibly move the aircraft body 1 regardless of the ground pressure of the float 2. bring to the surface. In conjunction with this operation, the operation cable 24 is also pulled, and the return spring 3
The shifter 27 rotates against the spring force of 4, separating the engager 29 from the low-speed pulley 31 and engaging it with the high-speed pulley 30. For this reason, the hydraulic pump 9 rotates at high speed and rapidly sends pressure oil to the cylinder 13 via the switching valve 10, lowering the wheels 5 at a steeper lowering speed than the wheel lowering speed during automatic lifting, and lifting the aircraft 1. It will be done quickly. Therefore, by performing this operation while the rice transplanter is turning, it is possible to prevent the float 2 from pushing the mud, and the cultivated soil will not be uneven.

Furthermore, after the rotation of the rice transplanter is completed, if the hand control lever 18 is returned to the position before rotation, the operation cable 1
9 and 24 are loosened, and the plant returns to the state at the time of the planting operation described above. In this case, the shifter 27 is rotated in the opposite direction by the spring force of the return spring 34 to separate the engager 29 from the high-speed pulley 30 and engage it with the low-speed pulley 31.

In the present invention, it is preferable that the valve body 13 of the switching valve 10 be stopped in a neutral state by rotating the hand-operated lever 18 by appropriate means, so that the body 1 can be maintained in an elevated state.

[Effects of the invention] As explained above, the rice transplanter body lifting device according to the invention can increase the flow rate of pressure oil by switching the switching valve and increasing the flow rate by simply operating the hand control means and without any special operations. , the lowering operation of the wheels by the hydraulic system can be switched to a steeper descending speed than the descending speed during automatic lifting, allowing the body of the rice transplanter to rise rapidly. It is possible to prevent mud from being pushed by the
During planting work, there is no problem such as the raising and lowering of the machine being sensitive to the ground pressure of the float that regulates the planting depth of seedlings to a predetermined depth, and the configuration of the switching valve is simple. This has the effect that switching operations can be performed reliably and there are fewer failures.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing a walking rice transplanter equipped with a body lifting device according to an embodiment of the present invention, Fig. 2 is a side view with a part of the hydraulic system cut away, and Fig. 3 is a diagram of the switching valve section. The cross-sectional explanatory diagram and FIG. 4 are explanatory diagrams of the configuration of the hydraulic pump drive section. 1... Aircraft, 2... Float, 3... Link,
4... Swing arm, 5... Running wheel, 6...
Planted body, 7... Engine, 8... Hydraulic system, 9...
... Hydraulic pump, 10 ... Switching valve, 11 ... Hydraulic cylinder, 12 ... Detection means, 13 ... Valve body, 14
... Piston, 15 ... Connection means, 16 ... Handle, 17 ... Gear, 18 ... Hand control lever,
19... Operation cable, 20... Seedling tank, 21
...Arm, 22...Mechanism for lifting the aircraft, 23...
... Hydraulic system operating speed switching means, 24 ... Operation cable, 25 ... Link, 26 ... Clutch mechanism, 27 ... Shifter, 28 ... Rotating shaft, 29 ...
Engagement element, 30, 31...high speed side, low speed side pulley,
32, 33... Endless belt, 34... Return spring.

Claims (1)

[Scope of utility model registration request] It has a float supported on the underside of the fuselage so that it can move up and down, and a running wheel that is moved up and down by a hydraulic device installed on the fuselage. A rice transplanter equipped with an automatic lifting means that moves the machine up and down to raise and lower the machine body relative to the rice field, and a hand-operated means that forcibly operates the hydraulic device in the direction of lowering the wheels at the operator's hand. , the oil passage and switching valve between the hydraulic cylinder and the oil tank of the hydraulic system are the same during automatic lifting and manual lowering using the hand-operated means, and the flow rate of the pressure oil is adjusted in conjunction with the operation of the hand-operated means. A device for lifting the body of a walk-behind rice transplanter, which is provided with a switching means for switching to a descending speed that speeds up the speed and rapidly lowers the wheels.