JPS6260041B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elevation control device for a rice transplanter, and more specifically, an elevation control device for a rice transplanter connected to the rear of a traveling vehicle body via a lift mechanism. The present invention relates to sensitivity adjustment of the elevation control.

[Prior art]

As previously disclosed in Japanese Utility Model Application Publication No. 48-84720, a rice transplanting machine is connected to a traveling vehicle body via a lift mechanism so as to be able to rise and fall, and a ground leveling body is provided on the side of the rice transplanting machine so that it can be adjusted up and down. Among rice transplanters configured to control the elevation of a rice transplanter, it has been known to change and adjust the sensitivity of the elevation control by changing the tension of a spring that presses down on a ground leveling body.

[Problem that the invention seeks to solve]

The conventional technology had a structure in which the sensitivity of the elevation control was changed by adjusting the lower pressure of the earth leveling body, which caused a problem in that the mud pushing situation and the leveling performance of the earth leveling body fluctuated.

[Means for solving problems]

In order to solve the above problems, this invention
A rice-transplanting machine is connected to the traveling vehicle body via a lift mechanism so that it can be raised and lowered, and a float 3 is installed on the side of the rice-transplanting machine.
The rice-transplanting machine is equipped with a sensing mechanism for lifting and lowering control that is movable by ground pressure fluctuations acting on the ground pressure, and the sensing mechanism is connected to the switching valve 11 of the hydraulic cylinder 23 for operating the lift mechanism installed on the traveling vehicle body side. In a device that controls elevation, the relationship between the port 21 provided on the valve body 12 side to the hydraulic cylinder 23 side and the port 25 provided on the oil tank 27 side, and the passages 19 and 24 provided on the valve body 15 side However, by moving the sensitivity adjustment lever 18, when adjusting the sensitive side in soft fields, the front side of the float 3 descends to a neutral setting, and conversely, when adjusting the insensitive side in hard fields, the float 3 becomes neutral. The rice transplanter lift control device is configured such that the front side is set at a position where the front side moves upward and becomes neutral.

[Operation and effect of the invention]

According to this invention, when the position of the valve body 15 with respect to the valve body 12 is changed using the sensitivity adjustment lever 18, the positions of the passages 19 and 24 with respect to the ports 21 and 25 are changed. Then, the amount of operation of the float 3 until oil flows into the hydraulic cylinder 23 or conversely, oil flows out from the hydraulic cylinder 23 and returns to the tank 27 is changed, and due to this change, the rice transplanting machine is moved up and down. It is controlled and stops at the neutral position of the switching valve 11. At this time, float 3 before change adjustment
The front direction angle of the float 3 has been changed, and with respect to the vertical position of the float 3 before the change adjustment, the raising control of the rice transplanter works with a small upward force, and conversely, the raising control does not work unless a large upward force is used. become.

Therefore, according to the present invention, it is possible to adjust the sensitivity of the rising side control of the rice transplanting machine without unnecessarily adjusting the tension of the spring that lowers the float, and to adjust the sensitivity while maintaining the soil leveling performance in an appropriate state. It has the effect of being able to.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In Fig. 1, reference numeral 1 indicates the body of the rice transplanting machine, and this body 1 is connected to the rear part of the traveling vehicle body (not shown) via a lift mechanism (not shown) for lifting and lowering control. A float 3 is attached below the body 1, and the rear part of the float 3 is rotatably supported, and the front part is movable in the vertical direction by means of a telescoping means 2. A balance-type lever 5 is pivotally supported on the fuselage 1 near the telescopic means 2 by a pin 4, and a sensor rod 7 is connected between one side of the lever 5 and a bracket 6 on the side of the float 3. One end of a wire 8 for lifting/lowering control is connected to the other side of the wire 5 .

Further, a slide guide 10 is attached to the fixed member 9 on the traveling vehicle side, and a valve body 12 of the switching valve 11 is slidably inserted into the slide guide 10, and one side is attached to both sides of the valve body 12. A strong compression spring 13 is interposed therebetween, and a weak compression spring 14 is interposed on the other side, and the other side of the wire 8 is tied to the end of the valve body 12 on the side where the strong compression spring 13 is interposed. A valve body 15 is inserted into the valve body 12 of the switching valve 11 from the side opposite to the side to which the wire 8 is connected. It is connected to the adjustment lever 18.

As detailed in FIG. 2, when the valve body 12 moves to the left side of the figure, the switching valve 11 opens the left passage 19.
The ports 20 and 21 communicate with each other through the hydraulic pump 22 to transfer pressure oil to the hydraulic cylinder 23 of the lift mechanism.
When the valve body 12 moves to the opposite right side, the ports 21 and 25 communicate with each other through the passage 24 on the right side, and the oil in the hydraulic cylinder 23 is drained into the oil tank 27.

As shown in FIG. 3, the groove 26 in the guide plate 28 of the sensitivity adjustment lever 18 has a central standard position A, positions B and C when the topsoil of the field is hard and soft, and a vertical movement of the rice transplanting machine. There are two positions D and E where the sensitivity adjustment lever 18 is installed.

Since the elevation control device for a rice transplanter according to the present invention is configured as described above, during planting work, a predetermined buoyancy is applied to the float 3 and the wire 8 is pulled, thereby causing the valve body 12 of the switching valve 11 to is located on the left side in FIG. 1 against the strong compression spring 13. At this time, if the topsoil of the field is in a good condition, neither hard nor soft, move the sensitivity adjustment lever 18 to the guide plate 28.
position A of the groove 26. Then, switching valve 1
The valve body 12 and the valve body 15 of 1 are in a positional relationship as shown in FIG.

From this state, when the wheels of the traveling vehicle enter a deep part of the tiller and the float 3 is pushed up, the sensor rod 7 rotates the lever 5 and further pulls the wire 8, which causes the valve body 12 of the switching valve 11 to moves to the left side, and the pressure oil from the hydraulic pump 22 flows into the passage 1.
9. Oil is supplied to the hydraulic cylinder 23 through the port 21, and the body 1 moves upward together with the float 3, raising the entire rice transplanting machine.

Conversely, when the wheels of the traveling vehicle go to a shallow part of the plowing platform and the float 3 descends under its own weight, the wire 8 becomes slack and the valve body 12 of the switching valve 11 moves to the right, which causes the hydraulic cylinder 23 The oil inside returns from port 21 to oil tank 27 via passage 24 and port 25, and both body 1 and float 3 move downward, and the entire rice transplanting machine descends.In this way, the rice transplanting machine moves deep and shallow in the tiller. The lift is controlled so that it runs at a constant level on the rice field regardless of unevenness.

Next, when the topsoil of the field is hard, even if the surface of the topsoil is slightly uneven, it is difficult to level it out with the ground pressure of the float 3, and the float 3 follows the uneven surface, causing the switching valve 11 to switch frequently. It is desirable to make the control sensitivity insensitive because the rice transplanting machine is frequently controlled to move up and down and is propelled while vibrating. Therefore, move the sensitivity adjustment lever 18 to position B.
Adjust and set. Then, in the switching valve 11, the valve body 15 moves to the left side in the drawing, and the distance between the left passage 19 and the port 20 on the hydraulic pump 22 side increases, and even if the valve body 12 is moved slightly to the left by the float 3. It will not rise, but float 3
When the switching valve 11 is first controlled to be neutral from the side, the valve body 12 assumes the initial relative position with respect to the valve body 15 and is maintained neutrally.
5 to the left to set the valve body 1.
2 is also neutral when moved to the left, so wire 8
becomes loose, and the front side of the float 3 moves up to a neutral position. In this state, float 3
Since the rice transplanter is no longer affected by ground pressure on the front side, the sensitivity for controlling the rice transplanter to raise it becomes less sensitive.

On the other hand, if the topsoil of the field is soft,
As the float 3 tends to sink, upward movement resistance increases, and a situation arises in which it pushes against the topsoil. In such a case, it is desirable to increase the control sensitivity. Therefore, the sensitivity adjustment lever 18 is set to position C. Then, this time, the valve body 1 in the switching valve 11
5 moves to the right side of the paper, and the distance between the passage 19 on the left side and the ports 20, 21 on the hydraulic pump 22 side and the hydraulic cylinder 23 side becomes narrower. When the rice transplanter moves to , the rice transplanting machine is controlled to rise, and the relative position between the valve body 12 and the valve body 15 returns to the original neutral position. However, even if the relative position between the valve body 12 and the valve body 15 returns to its original state, the valve body 15 is set to move to the right in the paper, so naturally the valve body 12 will also move to the right. will be set,
The front side of the float 3 with the wire 8 pulled is set in a neutral state in a lowered posture. Therefore, the front side of the float 3 is more susceptible to ground pressure action, and the sensitivity of controlling the rice transplanter to raise it becomes more sensitive. In this way, the inconvenient vertical movement of the planting machine due to the hardness and softness of the topsoil is adjusted.

Furthermore, when the sensitivity adjustment lever 18 is set to positions D and E, the valve body 15 moves left and right in the switching valve 11, so that the passages 19 and 24 are connected to the ports 2 and 2, respectively.
0, 25, etc., and the rice transplanting machine moves up and down regardless of the sensing by the sensor rod 7.

Furthermore, when the rice transplanting work machine is separated from the traveling vehicle body, the valve body 12 of the switching valve 11 is separated from the wire 8 and becomes free, but the springs 13 and 14 on both sides It is balanced at a position slightly closer to and held fixed in that position. Then, operate the sensitivity adjustment lever 18 to adjust the valve body 1.
When 5 is moved left and right, the switching valve 11 performs a switching operation, and the lift mechanism is freely operated by supplying and draining oil from the hydraulic cylinder 23.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially sectional side view, Fig. 2 is a sectional view showing the structure of the switching valve, and Fig. 3 is a plan cross-section of the sensitivity adjustment lever. It is a diagram. Symbols in the figure: 3 is a float, 11 is a switching valve, 12
is the valve body, 15 is the valve body, 19 and 24 are the passages, 23
indicates a hydraulic cylinder, 21 and 25 indicate ports, and 27 indicates an oil tank.

Claims (1)

[Claims] 1. A rice transplanting machine is connected to the traveling vehicle body via a lift mechanism so as to be able to rise and fall, and a sensing mechanism for controlling the rise and fall that is movable by ground pressure fluctuations acting on the float 3 is provided on the side of the rice transplanting machine, and the sensing mechanism is , a hydraulic cylinder 23 for operating the lift mechanism installed on the traveling vehicle body side.
In a device that controls the elevation and descent of a rice transplanting work machine by being connected to the switching valve 11 of By moving the sensitivity adjustment lever 18, the relationship between the passages 19 and 24 provided on the 15 side becomes neutral when the front side of the float 3 is lowered when adjusting the sensitive side in soft fields, and vice versa. A rising/lowering control device for a rice transplanter, wherein the front side of the float 3 is set at a set position where it moves upward and becomes neutral when adjusting the insensitive side in a hard field.