JPS6228810Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for vertically adjusting a pair of wheels that are vertically movably attached to the body of a rice transplanter via a swing arm.

Conventionally, this type of device is configured so that both wheels move up and down in opposite directions, so that when one wheel goes up, the other wheel goes down, in order to prevent the machine from moving up and down due to unevenness on the tiller. At the same time, both wheels are each provided with a buffer mechanism to cushion and absorb the impact acting on both wheels. However, providing a shock absorbing mechanism for each of the wheels in this way not only complicates the structure, but also requires space to install the two shock absorbers, making the rice transplanter large and heavy.

This invention uses a reverse action mechanism that connects both wheels to move up and down in opposite directions as a buffer mechanism that cushions and absorbs the impact acting on both wheels.
While improving the above-mentioned drawbacks, when traveling on the road with the wheels lowered and the aircraft raised, the reverse operation of both wheels is automatically prevented, and even in this case, a buffer operation is performed to allow the vehicle to travel on the road. It is designed to be stable and safe.

Next, an example of the present invention will be explained with reference to the drawings.
In the figure, reference numeral 1 denotes a fuselage 6 which has a frame 4 of an engine 3 connected to the front part of a transmission case 2, and a transmission case 5 to the rear thereof, floats 7, 8, 8 on the lower surface of the fuselage 6, and a pair of left and right wheels. 9, 9 shows a rice transplanter running in the direction of arrow A, and a seedling stand 10 and four planting mechanisms 11 are installed at the rear end of the transmission case 5.
A seedling planting device 12 is provided, and a pair of control handles 13 are also provided.

The two wheels 9, 9 are connected to the transmission case 2.
are respectively attached to the tips of swing arms 14, 14 which are rotatably attached to a boss 15 at the base thereof,
The engine 3 is rotatably driven by the transmission case 2 through a chain in the arm, etc., which is transmitted by a belt 16 from the engine 3.
A hydraulic pump 18 is provided which is driven by a belt 17.

Bell crank type lifting levers 19, 19 are provided on both left and right sides of the mission case 2, rotatably inserted into a shaft 20 which is supported through the mission case 2. The frame 4 of the engine 3 is connected to the swing arms 14, 14 through rods 21, 21, respectively, and the frame 4 of the engine 3 is formed into a rectangular cylindrical shape. is provided so as to protrude forward along the center line of the rice transplanter 1, and both ends of the frame 4 extend outside the frame through guide grooves 27, 27 provided on both left and right sides of the frame in the same direction as the piston 23. A swinging rod 25 protruding from the piston 25 is provided, and a mounting piece 32 fixed to the center of the rear surface of the swinging rod 25 is fitted into a groove 24 provided at the tip of the piston 23 along its axial direction, so that it can freely swing horizontally. A pin 26 is pivotally attached, and both ends of this swinging rod 25 are connected to the other ends of the bell crank type lifting levers 19, 19 via connecting rods 28, 28, respectively, so that both wheels 9, 9 are moved in opposite directions. When the swinging rod 25 is configured to move up and down, both ends of the swinging rod 25 are connected to the piston 23.
It is composed of a leaf spring that elastically bends and deforms in the same direction as the movement of.

On the other hand, at the tips of both the left and right sides of the frame 4,
When the piston 23 is at its maximum stroke, a pair of stoppers 29, 29 are attached to the bolt 30 so that the pivot points of the pin 26 at the front and center of the swinging rod 25 come into contact with the intermediate portions of both ends. It is provided so that it can be attached and detached at will. In addition, the front bumper 31 is attached to both stoppers 29, 29.
The inlet port 33 of the hydraulic cylinder 22 is connected to the discharge side of the hydraulic pump 18 via a pipe with a switching valve (not shown).
The ports 34 provided on the sides of the piston 23 are connected to the inlet side of the hydraulic pump 18, and the distal end of the piston 23 receives the hydraulic pressure sent from the inlet port 33 into the hydraulic cylinder when the piston 28 is near its maximum stroke. An L-shaped port 35 is provided that allows a portion to escape into the port 34.

In this configuration, when the hydraulic cylinder 22 is operated so that the piston 23 protrudes by switching the hydraulic pressure, the two bell crank type lifting levers 19,
Both swing arms 14, 14 are rotated downward via 19, both wheels 9, 9 are moved downward relative to the machine body 1, and the machine body 1 is raised relative to the wheels 9,
When the hydraulic cylinder 22 is switched so that its piston 23 moves backward, both wheels 9, 9 move toward the fuselage 1.
When the hydraulic cylinder 22 is operated to a neutral position that cuts off the hydraulic pressure to and from the hydraulic cylinder 22, the wheels 9 can be raised and lowered to any desired position. You can stop at
Through this operation, the distance between both wheels and the machine body can be arbitrarily set to a position corresponding to the depth of the tiller in the field, and rice transplanting work can be carried out.

In this rice transplanting work state, both wheels 9, 9 are
They are mutually interlocked via the swinging rod 25, and when one wheel 9 moves up and down due to the unevenness of the tiller, the other wheel 9 moves down and up in the opposite direction. This vertical movement in opposite directions allows the machine body to be maintained at a substantially constant height position and constant posture relative to the unevenness of the tiller. In this case, the range in which both wheels 9, 9 move up and down in opposite directions is determined in advance by the distance S between the rear surface of the swinging rod 25 at the tip of the piston 23 and the bottom surface of the groove 24 into which the swinging rod 25 fits. Can be set to

A swinging rod 25 that connects both wheels 9, 9 so as to operate in reverse is pivotally connected to the piston 23 of the hydraulic cylinder 22 at the center, and both ends thereof are connected to the piston 23 of the hydraulic cylinder 22.
Since the plate springs are configured to bend and deform in the direction of motion, the impact acting on both wheels 9, 9 when the rice transplanter 1 runs is caused by the elastic bending deformation of the plate spring rocking rod 25. and hydraulic cylinder 2
The shock can be absorbed by the cushion of the hydraulic oil in both parts, and the impact can be prevented from being transmitted to the fuselage.

In addition, in order to run the rice transplanter on the road, the piston 23 of the hydraulic cylinder 22 is moved to its maximum extent to lower both wheels 9, 9, and in other words, the machine body 1 is significantly raised. 2
3, when the swinging rod 25 is near the maximum stroke, the front surface of the swinging rod 25 touches the stoppers 29, 2 provided on both sides of the frame 4.
9, and the movement of the swinging rod 25 is restricted, so that when driving on the road, it is possible to prevent the wheels 9 from operating upside down when they are interlocked with each other.

In this case, by configuring the portion between the central part and both ends of the swinging rod 25 made of a leaf spring to be in contact with both the stoppers 29, 29, the swinging rod 25 can be moved against both the stoppers 29, 29. In the abutting state, both ends of the swinging rod 25 can be elastically bent and deformed in the forward and backward movement direction of the piston 23. Therefore, the impact mitigation and absorption effect of the swinging rod 25 is caused by the swinging rod 25 It is held even when traveling on the road when it comes into contact with both stoppers 29, 29.

Note that if both the stoppers 29, 29 are configured to be detachable, the piston 23 of the hydraulic cylinder 22 can be pulled out in this direction by removing both the stoppers 29, 29. Rings etc. can be replaced extremely easily and quickly.

As described above, the present invention uses a swinging rod that is pivoted by a pin halfway to the tip of the piston of a hydraulic cylinder that moves both left and right wheels up and down. In order to do this, the swinging rod is configured as a leaf spring, and since the swinging rod is used both as a reverse action mechanism and a buffer mechanism for both wheels, there is no need to provide a buffer mechanism for each of both wheels as in the conventional case. This means that the structure is extremely simple and can be provided at low cost.Moreover, the rice transplanter does not require space for a buffer mechanism, making it possible to make the rice transplanter smaller and lighter. Since the impact on the wheels is absorbed and alleviated by both the bending deformation of the swinging rod and the hydraulic cylinder, the buffering effect is large and rice transplanting operations can be carried out stably.

Furthermore, the present invention is configured such that when the hydraulic cylinder is at its maximum stroke when the rice transplanter is running on the road, the swinging rod made of the leaf spring comes into contact with a pair of left and right stoppers on the machine body. Therefore, when the height of both wheels is adjusted to rice planting work, both wheels can move up and down in opposite directions to keep the machine at a constant height and posture. When driving on the road, the vertical movement of both wheels in opposite directions is regulated by both stoppers, and both of these changes are automatically performed by raising and lowering the wheels. It is extremely easy to operate, and since both stoppers come into contact with the area between the center and both ends of the swinging rod, the swinging rod provides a cushioning effect for both wheels when driving on the road. In other words,
When running on the road, both wheels do not move up and down in opposite directions, and are switched to function as ordinary wheels with a shock absorbing mechanism, resulting in stable and safe road running.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a perspective view of the vertical movement device, and FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is a cross-sectional view of FIG. 5. 1... Rice transplanter, 6... Body, 9... Wheels, 14
... Swing arm, 22 ... Hydraulic cylinder, 2
3... Piston, 25... Swinging rod, 19, 19...
...Bell crank type lift lever, 29...stopper.

Claims (1)

[Scope of utility model registration request] A rice transplanter having wheels movable up and down via swing arms on both left and right sides of the machine body, wherein the machine body is provided with a hydraulic cylinder such that a piston of the hydraulic cylinder moves along the center line of the machine body,
At the tip of the piston in the hydraulic cylinder, a central part of a swinging rod extending transversely to the direction of movement of the rice transplanter is pivotally attached, and both left and right ends of the swinging rod and the two swings are connected to each other. The swinging rod is interlocked with the arm so that both wheels are lowered by the protruding movement of the piston, and both wheels are raised by the backward movement of the piston. The body is configured with a plate spring that can be elastically bent and deformed in the longitudinal direction of the piston, and the body includes:
A vertical movement device for wheels in a rice transplanter, comprising a pair of left and right stoppers that are brought into contact with a portion between the center and both ends of the swinging rod near the maximum stroke of a hydraulic cylinder.