JPH0314979Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a hydraulic mechanism switching regulation device for rice field working machines such as walking or riding rice transplanters, seeding machines, or fertilizer spreaders. .

[Problems to be solved by the prior art and the invention] In general, some rice field working machines of this type do not detect the height of the machine body relative to the running wheels, such as a walking type, or the height of the working part relative to the running part, such as a riding type. Some models are controlled by automatic switching of hydraulic valves connected to the mechanism, but these cannot be controlled manually when the aircraft is moving around, when replenishing planted seedlings, or when driving on the road. A regulating mechanism is provided which regulates the automatic switching operation of the hydraulic valve by selective switching operation and can selectively switch the hydraulic valve to each of rising, fixed (neutral), and descending states. There is. However, conventionally,
This regulation mechanism was implemented by controlling two actuation wires connected to the hydraulic valve side using an operating tool, which resulted in a complex structure and a large number of parts. Not only does it take time and effort to assemble or inspect and maintain, but it also has the disadvantage that if the tension balance between the two actuating wires is lost, valve switching by the operating tool cannot be performed accurately, which has become a problem.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a switching regulation device for a hydraulic mechanism in a paddy field working machine that can eliminate these drawbacks. In a paddy field work machine in which the height of the machine body with respect to the traveling wheels or the height of the working part with respect to the traveling part is controlled by automatic switching operation of a hydraulic valve linked to a sensing mechanism, the valve of the hydraulic valve is It consists of an actuating body that moves in conjunction with the switching operation, a first regulating body that is displaced by the switching operation of the operating tool, and a second regulating body that is installed opposite to the first regulating body, and each of the regulating bodies is provided with a hole. The actuating body is movably fitted into the loose fitting part, and the first regulating body and the second regulating body are moved so that the second regulating body follows the displacement movement of the first regulating body and is placed behind the first regulating body. By displacing in the opposite direction and regulating the movement stroke of the actuating body fitted into the loose fitting part, the automatic switching operation of the hydraulic valve is regulated and the valve can be switched using the operating tool. It is characterized by being linked by a cam mechanism. According to the present invention, with this configuration, the structure of the regulating mechanism that regulates switching of the hydraulic valve can be greatly simplified.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a traveling body of a walking type rice transplanter with one wheel, and the traveling body 1 has an engine 2,
The machine is equipped with a running wheel 3, a seedling stand 4, a planting claw 5, a driving handle 6, left and right side floats 7, a central sensing float 8, and a transmission mechanism that transmits the driving force from the engine 2 to the planting section. It is composed of a frame 9 and the like.

Reference numeral 10 denotes a chain case pivotably supported vertically on a transmission case 2a below the engine 2 in order to transmit power to the running wheels 3, and the chain case 10 includes a hydraulic cylinder 11 constituting a hydraulic mechanism. One end is connected, and as will be described later, the chain case 10 swings up and down in connection with the expansion and contraction operation of the hydraulic cylinder 11, thereby controlling the vertical posture displacement of the main body 1 relative to the traveling wheels 3. It is now possible to do so. The hydraulic cylinder 11 is provided with a hydraulic valve 12, and the valve rod 12a of the hydraulic valve 12 has a return ammunition 1.
An actuation plate 13 biased by 3a is integrally provided. Moreover, this operating plate 1
3 is connected to the sensing float 8 via a connecting link 8a with a shock absorber 8b, forming a sensing mechanism. Then, during the planting run,
When the sensing float 8 is pushed up by the rice field in a deep planting state, the actuating plate 13 rotates in the direction of arrow A, thereby causing the hydraulic valve 1 to rotate.
2 switches from neutral (fixed) to the rising side, pressure oil is sent to the hydraulic cylinder 11 and it expands, causing the chain case 10 to move downward and the main body 1 to move upward relative to the traveling wheels 3. Conversely, when the sensing float 8 goes down due to shallow planting, the hydraulic valve 12 switches from neutral to the descending side, and Therefore, the hydraulic cylinder 11 is contracted to move the machine body 1 downward to escape shallow planting, and in this way, hydraulic control is performed to maintain a substantially constant planting depth. ing.

One end of a connecting rod 14 is further pivotally connected to the operating plate 13, and the other end of the connecting rod 14 is connected to a side portion of the operating handle 6 with a swinging arm 14a interposed therebetween. A substantially L-shaped connector 14b is fixed to the tip of the connector 14b with a bolt 14c so as to be adjustable in position. This connector 14b has an operating pin 15.
are integrally provided. On the other hand, 16 is an operating lever that is an operating tool provided on the operating handle 6 side, and 17 is a first regulating body that rotates around the support shaft 17a. It is provided integrally with one regulating body 17.
On the other hand, reference numeral 18 denotes a second regulating body that rotates and displaces around the support shaft 18a, and the second regulating body 18 and the first regulating body 17 face each other in parallel, but the second regulating body 18 is operated by a tension bullet 18c (having a biasing force larger than the biasing force of the coil bullet 8b) so that the cam surface 18d presses into contact with the cam pin 20 provided on the first regulating body 17. energized. Furthermore, each of the regulating bodies 17 and 18 is provided with a long hole-shaped loose fitting portion 17b and 18b, and the operating pin 15 is movably fitted into the loose fitting portion 17b and 18b. There is. As will be described later, when a switching operation is performed by rotating the first regulating body 17 around the support shaft 17a by operating the operating lever 16, the displacement of the cam pin 20 accompanying this causes the second The regulating body 18 is configured to be displaced in a direction opposite to that of the first regulating body 17, and thus a cam mechanism is configured.

When the operating lever 16 is set to the automatic position, both the loose fitting portions 17b and 18b are in a substantially coincident state, and in this case, the operating pin 15 is moved by the sensing float 8. The operating pin 15, which operates in response to the planting depth control, is allowed to move over the entire movement stroke of raising U, fixing S, and lowering D (see Fig. 7 W).
The valve switching operation based on the automatic planting depth control using the sensing float 8 described above can be freely performed without any restrictions. On the other hand, when the operating lever 16 is operated upward to set it to the semi-automatic position, the loose fitting portion 17 on the first regulating body 17 side
b is displaced in the direction of arrow B with respect to the loose fitting portion 18b on the second regulating body 18 side, and the movement stroke on the upward stroke U side of the operating pin 15 is blocked, and the operating pin 1
The movement of the hydraulic valve 12 toward the upward stroke U side is completely restricted (see Fig. 7 It is now in a semi-automatic state. Furthermore, when the operating lever 16 is reversely operated downward to set it in the fixed position, the first regulating body 17 rotates in the opposite direction of arrow C. Therefore, the cam pin 20 also rotates in the direction of arrow C, and as a result, the second regulating body 18 is rotationally displaced in the opposite direction of arrow B, which is contrary to the first regulating body 17, against the tension bullet 18c. As a result, both the loose fitting parts 17b and 18b are shifted in opposite directions, and at the fixed stroke S position, the loose fitting parts 17b and 18b are sandwiched between mutually opposite ends and move upward and downward. (see FIG. 7Y), whereby the hydraulic valve 12 remains in a neutral state regardless of the sensing operation by the sensing float 8. When the operating lever 16 is further lowered and set to the raised position, the operating pin 15 is forcibly moved toward the upward stroke U side (7th (see figure Z), thereby hydraulic valve 1
2 is switched to the rising side, the hydraulic cylinder 11 is extended, and the aircraft body is raised.
In this case, the cam pin 20 is spaced apart from the cam surface 18d. In this way, the switching regulation mechanism 19 regulates the free switching operation of the hydraulic valve 12.
The switching operation order is such that the semi-automatic position is placed on one side of the automatic position, and the fixed position and raised position are placed on the other side.

In the embodiment of the present invention configured as described above, the work of planting seedlings on the rice field is performed by the planting operation of the planting claw 5 that is timed with the movement of the aircraft. In this case, the operating lever 16 is placed in the automatic position, and the seedlings can be planted at a uniform depth by switching the hydraulic valve 12 based on the sensing of the planting depth by the sensing float 8. When the machine is moving around, replenishing planted seedlings, or traveling on the road, the control lever 16 is operated to semi-automatic, fixed, and raised positions as necessary.

In this way, in the present invention, the operating lever 16
The switching operation of the hydraulic valve 12 restricts the automatic switching of the hydraulic valve 12 in response to the sensing operation, and the aircraft can be fixed at a required height or manually moved up and down. A regulating mechanism 19 that regulates automatic switching is a control lever 16
A simple structure that uses a first regulating body 17 on the side and a second regulating body 18 opposite thereto, and in which the actuating pin 15 is fitted into loose fitting parts 17b and 18b bored in both regulating bodies 17 and 18. However, the second regulator 18
In conjunction with the rotation of the first regulating body 17 due to the switching operation of the operating lever 16, the first regulating body 17 rotates in the opposite direction to regulate the movement stroke of the actuating pin 15, thereby widening and narrowing the movement stroke of the operating pin 15. The automatic switching operation of the hydraulic valve 12 is regulated, and manual switching control using the operating lever 16 is possible. Moreover, in this case,
Since the first regulating body 17 and the second regulating body 18 are displaced in opposite directions, the loose fitting portions 17b and 18b move in opposite directions, and therefore the wide/narrow regulating speed of the movement stroke of the operating pin 15 is As a result, the switching operation by the operating lever 16 of the hydraulic valve becomes quick and reliable, and the valve can be switched accurately.

Moreover, the rotational change of the second regulating body 18 in the opposite direction is achieved by an extremely simple cam structure consisting of the cam surface 18d provided between the second regulating body 18 and the first regulating body 17 and the cam pin 20. Since this can be carried out using the following method, it is possible to further simplify the structure.

[Function and Effect] In summary, the present invention is constructed as described above, so that the regulating mechanism that regulates the automatic switching control of the hydraulic valve and manually raises and lowers the aircraft body is operated in conjunction with the hydraulic valve. It can be constructed from a body and two regulating bodies, and therefore has a simpler structure and is more compact than the conventional one, which uses two actuating wires, and is also easy to adjust. It can be made into something. Moreover, the wide/narrow regulating speed of the movement stroke of the actuating body for switching the hydraulic valve with the operating tool is such that the loose fitting part into which the actuating member fits, the second regulating body becomes the first regulating body as the operating tool is switched. Since the hydraulic valves are displaced in opposite directions, the switching operation by the operating tool of the hydraulic valve becomes quick and reliable, and accurate valve switching is performed.

[Brief explanation of the drawing]

The drawings show an embodiment of a switching regulation device for a hydraulic mechanism in a paddy field working machine according to the present invention, in which FIG. 1 is an overall plan view of the rice transplanter, FIG. 2 is an overall side view of the rice transplanter, Figure 3 is a schematic diagram of the hydraulic pressure regulation mechanism, Figure 4 is an enlarged side view of the regulation mechanism, Figure 5 W,
X, Y, and Z are respectively action explanatory diagrams, and FIG. 6 is a circuit diagram of the hydraulic mechanism. In the figure, 1 is a traveling aircraft body, 3 is a traveling wheel, 12 is a hydraulic valve, 15 is an operating pin, 16 is an operating lever,
17 is a first regulating body, 18 is a second regulating body, 17b,
18b is a loose fitting part, 18d is a cam surface, and 20 is a cam pin.

Claims (1)

[Claims for Utility Model Registration] 1. A paddy field working machine in which the height of the machine body with respect to the traveling wheels or the height of the working part with respect to the traveling part is controlled by automatic switching operation of a hydraulic valve connected to a sensing mechanism. , comprising an actuating body that moves in conjunction with the valve switching operation of the hydraulic valve, a first regulating body that is displaced by the switching operation of the operating tool, and a second regulating body disposed opposite to the first regulating body, The actuating body is movably fitted into the loose fitting portions provided on both regulating bodies, and the first regulating body and the second regulating body are moved so that the second regulating body follows the displacement operation of the first regulating body. By displacing in the opposite direction to the one regulating body and regulating the movement stroke of the actuating body fitted into the loose fitting part, the automatic switching operation of the hydraulic valve is restricted and the operation tool is operated. A switching regulation device for a hydraulic mechanism in a paddy field working machine, characterized in that the valves are connected so as to be able to switch. 2 The first regulating body and the second regulating body have different rotation axes and are linked by a cam mechanism consisting of a cam pin provided on one regulating body and a cam surface provided on the other regulating body. A switching regulating device for a hydraulic mechanism in a paddy field working machine as set forth in claim 1 of the utility model registration claim.