JPS6411246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a float that slides on the top soil surface of a paddy field is provided on the fuselage body so as to be movable up and down, and wheels that are moved up and down by a hydraulic cylinder attached to the fuselage body are provided. This invention relates to a hydraulic control valve switching device for a rice transplanter, which is configured to interlock and connect a control valve so that when the float moves up, the wheels move down, and conversely, when the float moves down, the wheels move up.

Conventionally, rice transplanters equipped with such a wheel vertical movement device are usually set so that the front and rear balance of the rice transplanter is balanced in consideration of the wheel reaction force during running, so that the rice transplanter does not move directly into the seedling tank. When stopping the aircraft to replenish seedlings, etc., the drive reaction force of the wheels is eliminated and the aircraft leans forward, which causes the float to be pushed up by the topsoil of the paddy field and controlled. The valve is switched from the neutral position to the lift position and the wheels are moved down. As a result, the aircraft body leans further forward and the float is further pushed up, which causes the aircraft body to lean forward significantly, making it difficult to carry out operations such as replenishing seedlings. Therefore,
In order to solve this problem, a locking means was devised to prevent the control valve from operating completely, but when the pilot took his hands off the handle, the aircraft rapidly rotated forward and downward, so the control valve There is a drawback that the interlocking operating member causes hunting when locked, causing temporary vertical vibration of the wheel.
It has been extremely difficult to prevent the large rotational force applied to the actuating member all at once.

This invention aims to eliminate the above-mentioned drawbacks and includes the following technical means.

That is, in the present invention, a central float 3 that slides on a rice field 2 is provided on a fuselage 1 so as to be movable up and down, and wheels 5 are provided that are moved up and down by a hydraulic cylinder 27 attached to the fuselage 1. In a rice transplanter that moves the machine body 1 up and down with respect to the rice field 2, the control valve 26 that controls the hydraulic cylinder 27 is
The actuating member 11 and the central float 3 are connected to each other via an actuating member 11 rotatably pivoted on the body 1 side, and the actuating member 11 and the central float 3 are connected to an interlocking tool 13 having a telescopic spring 14 interposed therebetween. Therefore, when the central float 3 moves upward from a certain range position, the control valve 26 switches to move the wheels 5 downward, and conversely, when it moves downward from a certain range position, it switches the control valve 26 to move the wheels 5 upward. A lower float spring 22 is interposed between the actuating member 11 and the fuselage 1 and acts in a direction to press the central float 3, and the operator's hand control lever 2
1 is provided with a stopper mechanism for locking the actuating member 11 so as to prevent the upward movement of the central float 3;
This stopper mechanism is provided with a stopper spring 16 that cooperates with the float lower spring 22 to compress the spring 14 when the central float moves upward and prevents the actuating member 11 from moving toward the wheel lowering side. This is the configuration of a hydraulic control valve switching device for a rice transplanter.

Embodiments of the present invention will be specifically described below with reference to the drawings.

In Figure 1, 1 is the body of the rice transplanter;
On the lower side, a central float 3 and side floats 4 that slide on the rice field 2 are arranged in parallel in the left and right width direction, and these floats have their rear parts as fulcrums and their front parts moving up and down, as seen in well-known rice transplanters. It is supported so that it can tilt in the direction. Further, a pair of left and right wheels 5 are arranged on the sides of the fuselage 1, and these wheels 5 are pivotally supported by the free end of a swing arm 6, which also serves as a transmission case and whose base is pivoted to the fuselage 1, and can move up and down. It is becoming. In the figure, numeral 7 is an operating handle, 8 is a seedling tank, and 9 is a standby stand for seedlings.

As shown in an enlarged view in FIG. 2, the rice transplanting machine 1 has an operating member 11 on one side near the front that performs a switching operation of a hydraulic control valve 26, which will be described later.
It is rotatably supported by a pivot shaft 12.
This actuating member 11 has two elongated holes 11a and 11b with the pivot shaft 12 in the middle, and one of the elongated holes 11a has an interlocking device whose lower end is pivoted to the front part of the central float 3. The upper ends of 13 are engaged. This interlocking tool 13 has a spring 1 having elasticity in the middle part.
4 is provided, and this spring 14 is connected to the actuating member 11
In the figure, the spring force acts in the direction of clockwise rotation (lift side). Further, another long hole 11b bored in the actuating member 11 is interlocked with the next stopper mechanism. That is, the pin 15a formed at the free end of the wire rod 15 constituting the hydraulic operation system is engaged, and in the planting work state, the pin 15a is located at the center of the long hole 11b and has a predetermined stroke left and right. It is in a state of play.
This wire rod 15 is also provided with an elastic stopper spring 16 having extensibility. This spring 16 has one end attached to one side of a support member 17 fixed to the fuselage 1, and the other end attached to a wire rod 1.
The actuating member 11 is rotated counterclockwise so that the spring force of the spring 16 for the stopper acts in a direction opposite to the spring force of the spring 14. It gives elastic force in the direction of rotation (down side). The wire 19 has its distal end connected to the end of the wire rod 15, and its rear end connected to the hydraulic operating lever 21 (the first
(see figure) so that it can be easily operated by the operator. The operating member 11 further includes a retractable float lower spring 22 whose one end is locked to the fuselage 1 side via a mounting piece 23.
is stretched so that its end is locked between the pivot shaft 12 and the elongated hole 11a. However, like the stopper spring 16, the spring 22 for lowering the float bullet of the lever exerts a spring force in a direction opposing the spring force of the spring 14 (a direction in which the actuating member 11 is rotated counterclockwise). is made to work.

The spring 14, the stopper spring 16, and the float lower spring 22 are arranged so that the rotational force exerted by each spring on the operating member 11 counteracts the rotational force exerted by the spring 14. The spring strength of each spring is set such that the combined rotational force of the spring 16 and the float lowering spring 22 is large.

The actuating member 11 is connected to an actuating arm 25 protruding from a rotation switching shaft of a control valve 26 fixed to the fuselage 1 via a connecting rod 24 connected to its free end. By rotating the valve 11, the valve 26 is switched between a (down position), b (neutral position), and c (lift position) shown in FIG. The pressure oil outlet port of this control valve 26 is connected to a hydraulic cylinder 2 attached to the aircraft body 1.
The tip of the piston shaft 29, which is connected to the oil supply port 27a (see Fig. 3) of No. 7 and the piston 28 of the hydraulic cylinder 27, is connected to the center of the balance rod, and is connected to the left and right ends of the balance rod. A connecting body 31 connected to the swing arm 6 is connected to the tip of a swing arm 32 erected at the pivot base of the swing arm 6, and the swing arm 6 tilts up and down due to the expansion and contraction of the piston of the hydraulic cylinder 27, and rotates the wheels. 5 is designed to move up and down.

Next, to explain the operation, first, by operating the hydraulic control lever 21, the wire 19 is pulled and the pin 1 is pulled.
5a is set in the position shown by the solid line in FIG. 2, and the seedling planting work is started. At this time, when the wheels 5 are rolling on a flat plowing platform and the machine body 1 is traveling horizontally on the rice field 2 via the center float 3 and the side floats 4, the operating member 11 is moved as shown in FIG. The control valve 26, which is in the position shown in FIG. 4 and is in an interlocking relationship via the connecting rod 24 and the actuating arm 25, is in the neutral position shown in FIG. 4b. In this state, the pressure oil from the hydraulic pump (not shown) is returned to the oil tank (not shown) via the path indicated by the arrow, and the hydraulic oil is returned to the oil tank (not shown).
7 is in an inactive state, and the wheels 5 do not move up or down.

While traveling here, when the machine body 1 is pushed up by the wheels 5 riding on the convex plowing platform, the center float 3 and the side floats 4 come to float above the rice field 2, and the weight of the float and the float drop are reduced. Spring 2
2, the front part of the central float 3 is lowered.
As a result, the interlocking tool 13 is rapidly pulled down,
The actuating member 11 is rotated counterclockwise in FIG. 2 to switch the control valve 26 to the down position shown in FIG. 4a. As a result, the oil in the hydraulic cylinder 27 is returned to the oil tank via the path shown by the arrow, and the piston shaft 29 is retracted into the cylinder 27, passing through the connecting body 31 and the swing arm 32 to the swing arm 6. tilts upward, and the wheels 5 move upward, thereby lowering the aircraft 1. When the pulling action of the actuating member 11 by the interlocking tool 13 is canceled due to the descent of the machine body 1, the actuating member 11 returns to the neutral position and the control valve 26 is again switched to the neutral position shown in FIG. 4b.

Similarly, when the wheel 5 falls into the recess of the tiller, the lowering of the machine body 1 causes the interlocking tool 13 connected to the float 3 to be activated by the float lowering spring 22.
The actuating member 11 is pushed up against the spring force of FIG.
By switching to the lift position shown in and moving the wheels 5 downward, the machine body 1 rises, and when the pushing action by the interlocking tool 13 is canceled as the machine body 1 rises,
The switching valve 26 is switched to the neutral position.

In this way, the machine body 1 is adjusted to run based on the field surface without being affected by the unevenness of the tiller, but in this case, when the number of seedlings in the seedling tank 8 decreases, When transferring the seedlings placed in the seedling tank 9 to the seedling tank 8, the seedling planting work is temporarily stopped. Then, operate the hydraulic control lever 21 to connect the wire 19.
relax. At this time, the driving reaction force of the wheels disappears, and the front part of the aircraft 1 descends, so the center float 3
The front part of the field will be pushed up by the rice field.

However, at this time, in addition to the float lowering spring 22, the stopper spring 16 strongly lowers the center float 3, so the spring 14 is compressed and the actuating member 11 is not rotated.

Therefore, even though the central float 3 moves upward, the control valve 26 is not switched from the state in which seedlings are being planted, and the wheels 5 are not moved downward and are stably maintained in the same state. Become.

For this reason, unlike conventional devices, an unexpected situation does not occur where, as soon as the operator's hand is released from the operating handle 7, the forward leaning posture of the machine body increases, making it difficult to supply seedlings to the seedling tank 8. , seedlings can be easily supplied.

As described above, since the present invention has the above-described configuration, when the forward movement of the machine body is stopped and the work is interrupted during the seedling planting work, when the stopper mechanism of the control valve is operated with the operating lever on the hand side, the control valve can be operated almost immediately before the seedling planting work. The machine can maintain its posture and stop accurately, making it easy to replenish seedlings into the seedling tank, and when resuming work after an interruption, there is almost no vertical movement of the wheels, allowing the machine to start in the same working position as before the interruption. Therefore, the seedling planting depth does not change and the seedling planting work can be carried out accurately.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a rice transplanter to which the present invention is applied, FIG. 2 is a side view showing an enlarged view of the main parts of the present invention, and FIG. FIG. 4 is a diagram showing the switching action of the control valve. 1 is the fuselage, 2 is the surface, 3 is the center float, 4 is the side float, 5 is the wheel, 11 is the operating member, 13
1 is an interlocking tool, 14 is a spring, 15 is a wire rod, 1
5a is a pin, 16 is a spring for the stopper, 22
is the float lowering spring, 25 is the operating arm, 26
indicates a control valve, and 27 indicates a hydraulic cylinder.

Claims (1)

[Claims] 1. The fuselage 1 is equipped with a central float 3 that can be moved up and down to slide on the rice field 2, and equipped with wheels 5 that are moved up and down by a hydraulic cylinder 27 attached to the fuselage 1.
In the rice transplanter that moves the machine body 1 up and down with respect to the rice field 2 by moving the wheels 5 up and down, the hydraulic cylinder 27
A control valve 26 for controlling the control valve 26 is configured to be switchably interlocked with an operating member 11 rotatably mounted on the body 1 side, and a telescopic spring 14 connects the operating member 11 and the central float 3. When the central float 3 is moved upward from a certain range position by the interlocking device 13 interposed in the middle, the control valve 26 is switched to the side that moves the wheels 5 downward, and conversely, when the center float 3 is moved downward from a certain range position, the wheels 5 are interlocked and connected to each other so as to switch to the upward movement side, and
1 and the fuselage 1 is interposed with a float lowering spring 22 that acts in the direction of pressing the central float 3,
The central float 3 is operated by the operator's hand control lever 21.
A stopper mechanism is provided for locking the actuating member 11 to prevent upward movement, and the stopper mechanism includes a stopper mechanism that cooperates with the float lowering spring 22 to prevent the spring 14 from being compressed when the central float moves upward. This hydraulic control valve switching device for a rice transplanter is provided with a stopper spring 16 that prevents a urging operation member 11 from operating on the wheel lowering side.