JPH0216567Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a rice transplanter in which the vertical movement of the planting device is adjusted by the ground pressure of the float, and a float in the rice transplanter that prevents the planting depth from changing regardless of the hardness or softness of the rice surface. This invention relates to a ground pressure adjustment device.

Generally, if the planting device is raised and lowered by the ground pressure of the float, the planting will be too shallow in hard fields, and too deep in soft fields.

To eliminate these drawbacks, raise the front part of the float to increase the angle of inclination. This will make the float less sensitive to ground pressure, which will allow you to set the appropriate planting depth even in hard fields. Lowering the slope to reduce the angle of inclination improves sensitivity and allows for proper planting depth even in soft fields.

However, the vertical movement of the float due to the height of the tiller was transmitted to the hydraulic valve using wires.
If the outer position of the wire is changed to adjust the inclination angle of the float, if mud gets inside the wire or the wire is bent, the inner wire will become sluggish and will not be able to properly sense ground pressure. .

In order to solve this problem, the rear part of the float is pivoted to the fuselage so that it can move up and down, and the float is connected to the downward lever of the hydraulic valve attached to the fuselage using a link mechanism, and a movable part is attached to the middle of the link mechanism. A fulcrum was provided, a link arm pivoted on this movable fulcrum was connected to a float adjustment lever, an arm was provided extending upward from the hydraulic valve, and this arm was connected to a manual lever that controlled the operating range of the hydraulic valve. However, since it requires an arm separate from the one that connects the link mechanism and a means for regulating the operating range of the hydraulic valve, the configuration becomes complicated, resulting in high costs and a large installation space.

Additionally, in the past, a bullet for biasing the float downward was attached to the hydraulic valve side end of the link mechanism that interlocked the hydraulic valve and the float. When a certain movable fulcrum is operated to lower the float using the float adjustment lever, the movable fulcrum is moved in the opposite direction to the direction in which the projectile is pulled, which requires a large operating force and also causes the projectile to move further than the hydraulic valve. Since it had to be installed in the front, it was difficult to obtain installation space.

The purpose of this invention is to solve the above-mentioned problems.The rear part of the float is pivotally connected to the fuselage so that it can move up and down, and the float is connected to the lever of the hydraulic valve attached to the fuselage using a link mechanism. In a rice transplanter in which a movable fulcrum is provided in the middle of the link mechanism, and a link arm pivoted on this movable fulcrum is connected to a float adjustment lever, the link mechanism is directly connected to a lever of a hydraulic valve, and the link A manual lever for regulating the operating range of the hydraulic valve is interposed and connected in the middle of the mechanism, and the lever of the hydraulic valve and the float adjustment lever are moved downward from the fulcrum of the link arm pivoted on the movable fulcrum. It is characterized by the addition of a return spring that urges the device to operate.

The embodiment shown in the drawings will be explained below.1
is an aircraft having front wheels 2, 2 and rear wheels 3, 3 on the left and right sides, and an engine mounted on the front,
A control section is provided in the middle part, a driver's seat 4 is attached to the rear part, and a planting device 7 is attached to the rear part of the body 1 so as to be movable up and down by lower links 5, 5 and a top link 6. A float 8 is installed at the rear of the planting transmission case 7a in which the transmission mechanism 7 is installed.
is pivoted so that it can be tilted up and down.

9 is a hydraulic cylinder whose lower end is pivoted to the fuselage 1; its piston rod 9a is connected to an arm 10 projecting downward from the top link 6; a valve 11 for switching the oil path to the hydraulic cylinder 9 is connected to the hydraulic It is attached to the body 1 integrally with the pump 12.

As shown in FIG. 2, the valve arm 13 for operating the valve is connected to the upper end of a link arm 18 which rotates back and forth about a fulcrum pin 15 by means of a rod 14a and a link plate 14b. The front part of is a swing arm 17 whose rear end is pivotally connected to the front part of the planting transmission case 7a.
The front end of the swinging arm 17 is attached to one end of a link 20 which is connected to a vertical frame 19 integral with the machine frame of the planting device 7 by a connecting rod 18.
The other end is connected to the lower end of the link arm 16 via a connecting rod 22, and the lower end of the link arm 16 is biased by a return spring 23 so that the valve arm 13 moves downward. ing.

Further, the base of the float adjustment lever 24 is pivotally supported by a fulcrum pin 26 on a line a connecting pins 25, 25, which pivotally connect the front parts of the lower link 5 and top link 6 when viewed from the side. The lower end of an arm 27 that integrally projects downward from the base of the float adjustment lever 24 is connected to the link arm 16.
A fulcrum pin 15 serving as a movable fulcrum is supported at a portion corresponding to the line a.

Further, an arm 2 protruding from the base of the hydraulic lever 28
8a is connected via a rod 31 to the rear part of a plate 30 which is pivotally supported by a fulcrum pin 29.
The pin 32 protruding from the upper part of the plate 30 is fitted into a long hole 33 formed in the link plate 14b, so when the hydraulic lever 28 is set to the raised position, the plate 30 rotates counterclockwise. The pin 32 pushes the link plate 14b forward, rotates the valve arm 13 to the raised position, and the hydraulic cylinder 9 pushes up the planting device 7.

Further, when the hydraulic lever 28 is tilted forward and set to the automatic position, the pin 32 moves to the rear side of the elongated hole 33.

At this time, the planting device 7 is rising and the float 8 is not in contact with the ground, and the spring 23 is pulling and urging the link arm 16 downward, so the planting device 7 is descending and the float 8 is in contact with the ground. As the ground pressure increases, the swing arm 17 rotates upward, the link arm 16 rotates counterclockwise, and when the valve arm 13 rotates to the neutral position, the hydraulic cylinder 9 lowers. Operation stops.

Therefore, if the hardness of the field in which the seedlings are planted is standard, set the float adjustment lever 24 to the intermediate position (the position shown in Figure 2), and if the tiller becomes deeper during work, the hardness will be lowered as indicated by the chain line in Figure 2. As shown, the float 8 pushes up the swinging arm 17, so the planting device 7 rises, and conversely, when the plow becomes shallow, the swinging arm 17 rotates downward, so the planting device 7 descends.

Next, when the field is soft, when the float adjustment lever 24 is turned upward and set as shown by the chain line in FIG. 4, the fulcrum pin 15 moves forward and the link 20 moves clockwise. The front part of the float 8 is pushed down by rotating in the direction, and the float 8 is lowered forward than in the standard state, resulting in a larger contact surface, which provides sufficient sensing performance even in soft fields where the force pushing up the float 8 is weak. is obtained and the planting device 7
can be adjusted to the appropriate height.

In addition, in hard fields, when the float adjustment lever 24 is rotated downward to the position shown by the dotted line in FIG. The sensitivity of the ground pressure of the float 8 is reduced, and appropriate sensing performance corresponding to hard rice fields can be obtained, and as a result, the planting depth can be made substantially constant regardless of the hardness or softness of the field.

At this time, when the link arm 16 is rotated forward by the float 24 in a soft field, the spring 23 is reduced by β and becomes weaker, so the ground pressure sensitivity of the float 8 is improved, and conversely, in a hard field. On the other hand, when the link arm 16 is moved backward,
The spring 23 is stretched by α and the tension increases, the ground pressure sensitivity of the float becomes dull, and the sensing performance of the float 8 improves.

Furthermore, mud is scattered due to the rotation of the wheels during planting work and adheres to various parts of the control unit, but since the control unit is composed of a link mechanism, it always operates accurately, and the fulcrum pin 15 of the link arm 18 and the link 2
The fulcrum pin link 20a of 0 is a line a connecting pins 25, 25 and 25a, 25a, which are the fulcrums of the top link 6 and the lower link 5 when viewed from the side.
b, it is formed into a parallel link, and the vertical movement of the float 8 can be smoothly transmitted to the valve arm 13 while the planting device 7 is raised and lowered.

As mentioned above, the present invention pivots the rear part of the float to the fuselage so that it can move up and down, and connects the float and the lever of the hydraulic valve attached to the fuselage using a link mechanism.
In a rice transplanter in which a movable fulcrum is provided in the middle of the link mechanism, and a link arm pivoted on the movable fulcrum is linked to a float adjustment lever, the link mechanism is directly connected to a lever of a hydraulic valve, and the link mechanism is A manual lever that regulates the operating range of the hydraulic valve is interposed and connected in the middle, and the lever of the hydraulic valve and the float adjustment lever are operated in the downward direction on the lower side of the fulcrum of the link arm pivoted on the movable fulcrum. Since a return spring is attached that biases the float, when the float is lowered to adjust the ground pressure sensitivity, the movable fulcrum is also biased downward by the bullet, and the float is forced to resist the ground pressure by the float adjustment lever. In addition, the ammunition can be easily lowered by using the space overlapped with the link mechanism.

In addition, a part of the link mechanism can be used to regulate the operating range of the hydraulic valve, so there is no need to provide the hydraulic valve operating range regulating means separately from the link mechanism as in the past, simplifying the configuration and reducing costs. In addition, even if the hydraulic valve is installed in a narrow space, it will not interfere with the operation of the hydraulic valve operating range regulating means and the link mechanism, and the elevation control of the aircraft using the float as a sensing means can be performed smoothly. Can be done accurately.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
FIG. 1 is a partially cutaway side view of the riding rice transplanter, FIG. 2 is a side view of the main parts, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is an operational view. 8...Float, 13...Valve arm, 14
b... Link plate, 15... Fulcrum pin, 16
... Link arm, 23 ... Return spring, 2
4...Float adjustment lever, 28...Manual hydraulic lever, 30...Plate.

Claims (1)

[Scope of utility model registration request] The rear part of the float is pivoted to the fuselage so that it can move up and down,
A rice transplanter in which the lever of a hydraulic valve attached to the machine body and a float are connected by a link mechanism, a movable fulcrum is provided in the middle of the link mechanism, and a link arm pivoted on this movable fulcrum is linked to a float adjustment lever. , the link mechanism is directly connected to a lever of a hydraulic valve, a manual lever for regulating the operating range of the hydraulic valve is interposed and connected in the middle of the link mechanism, and the fulcrum of the link arm is pivoted on the movable fulcrum. 1. A float ground pressure adjustment device for a rice transplanter, characterized in that a return spring is attached to the lower side of the hydraulic valve lever and the float adjustment lever for urging the hydraulic valve lever and the float adjustment lever to operate downward.