JPH074089B2 - Switching control device for hydraulic mechanism in paddy work machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hydraulic mechanism switching restriction device in a paddy working machine such as a walk type or a riding type rice transplanter or a seeder.

[Problems to be Solved by Prior Art and Invention] Generally, in this kind of paddy working machine, the height of the machine body relative to the traveling wheels like a walking type machine or the working section height against a traveling section like a riding type machine is There is one that is controlled by the valve switching operation of the hydraulic mechanism linked to the sensing mechanism, but this one is used when the aircraft is traveling, replenishing planting seedlings, or running on the road. The valve switching is regulated so that the desired attitude of the vehicle with respect to the traveling wheels can be maintained. However, conventionally, the regulation mechanism for performing this regulation control is provided with an operating plate on the valve rod of the hydraulic valve, and the operating wires are connected to both sides of the operating rod with the valve rod sandwiched therebetween. The valve switching was regulated by pulling each separately. For this reason, two sets of operating tools for switching valves are required, which makes the structure complicated, and if the balance of the pulling force due to the two operating wires is lost, reliable switching of valves cannot be regulated. However, in addition to causing malfunctions, it is difficult to adjust these balances, and it takes a lot of time for factory assembly and maintenance / inspection, resulting in poor workability, which is a problem.

[Means for Solving the Problem] The present invention was conceived with the object of providing a switching control device for a hydraulic mechanism in a paddy work machine that can eliminate these drawbacks in view of the above-mentioned circumstances. In the paddy work machine, the height of the machine body relative to the traveling wheels or the height of the working portion relative to the traveling portion is controlled by the automatic valve switching operation of the hydraulic mechanism linked to the sensing mechanism. A restricting mechanism for restricting a simple valve switching operation, an operating body that moves in conjunction with the valve switching operation, a first restricting body that is displaced by a switching operation of an operation tool, and a first restricting body that is installed opposite to the first restricting body. Two restricting bodies are used, and each of the restricting bodies is provided with a loose fitting portion into which the actuating body is movably fitted, and the movable stroke of the actuating body is within a range in which the loose fitting portions can be simultaneously fitted. To configure Along with
A cam mechanism for restricting valve switching is provided between the first restricting body and the second restricting body by moving the restricting bodies in a relatively antireverse manner in accordance with the switching operation of the operation tool to limit the movement stroke to a narrow range. It is characterized by being provided.

Further, according to the present invention, with this configuration, the regulating mechanism for automatically regulating the valve switching has a simple and easy-to-adjust structure with two regulating bodies and an operating body interlocking with the valve switching. Therefore, the valve switching can be reliably regulated without malfunction.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine of a single-wheeled rice transplanter, which is an engine 2, a traveling wheel 3, a seedling stand 4, a planting claw 5, a driving handle 6, left and right side floats 7. , A sensing float 8 in the center, a body frame 9 in which a transmission mechanism for transmitting the driving force on the engine 2 side to the planting portion is incorporated, and the like. Then, as in the conventional case, the seedlings for the unit planting stock are scraped from the seedling mounting table 4 by the seedling planting operation of the planting claws 5 which are synchronized with the traveling of the machine body 1, and are planted on the rice field. It is a thing.

Reference numeral 10 denotes a chain case pivotally supported in a transmission case 2a below the engine 2 so as to be vertically swingable to transmit power to the traveling wheels 3, and the chain case 10 includes a hydraulic cylinder 11 constituting a hydraulic mechanism. One end of is connected,
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, so that the vertical displacement of the machine body 1 relative to the traveling wheels 3 can be performed. . The hydraulic cylinder 11 is provided with a hydraulic valve 12, and the valve rod 12a of the hydraulic valve 12 is integrally provided with an operating plate 13 which is biased by a return bullet 13a. Moreover, the sensing float 8 is connected to the operating plate 13 via the connecting link 8a, which constitutes a sensing mechanism. Then, when the sensing float 8 is pushed up by the rice field due to the deeply planted state during the planting traveling, the operating plate 13 is indicated by the arrow A.
Direction, the hydraulic valve 12 is switched from neutral (fixed) to the upward side by this, pressure oil is sent to the hydraulic cylinder 11, the hydraulic cylinder 11 extends, and the chain case 10 is moved downward. When the body 1 is moved upward relative to the traveling wheels 3 to remove deep planting, and conversely, when the sensing float 8 is lowered due to a shallow planting state, On the contrary, the hydraulic valve 12 is switched from the neutral side to the descending side, whereby the hydraulic cylinder 11 is contracted to move the machine body 1 downward so as to remove the shallow planting. The hydraulic control is performed so that the planting depth of

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 a side portion of the driving handle 6 with a swing arm 14a interposed therebetween. The connector 14b having a substantially L shape is fixed to the tip of the connector by a bolt 14c so that the position of the connector 14b can be adjusted. The connecting pin 14b is integrally provided with an operating pin 15 corresponding to the operating body of the present invention, whereby the operating pin 15 is set to perform an operation in response to the operating plate 13. There is. On the other hand, 16 is an operation tool including an operation lever provided on the side of the steering wheel 6, and 17 is a support shaft.
Although it is the first restriction body that rotates about 17a as a fulcrum, the operation tool 1
A base end portion of 6 penetrates through an engagement hole 17c formed in the first restriction body 17 and is rotatably supported by a pin shaft 17d fixed to the first restriction body 17 in the axial direction. Then, the operation tool 16 is moved to the guide groove of each guide position (semi-automatic position, automatic position, fixed position, rising position from the upper side) of the lever guide 21 described later by the coil ammunition 17e wound around the pin shaft 17d. It is urged toward the side to be fitted and engaged, and it is disengaged from the guide groove by operating against the coil ammunition 17e and can be freely switched to a desired guide groove position along with the lever guide 21. It is becoming like this.

On the other hand, 18 is the support shaft 1 while being urged by the tension bullet 18c.
A second regulation body that rotates about 8a as a fulcrum, and the second regulation body 18 and the first regulation body 17 face each other in a juxtaposed state, and the second regulation body 18 has a cam surface. 18d is formed,
The cam surface 18d is urged by a tension bullet 18c so as to be pressed by a cam pin 20 provided on the first restricting body 17 to form a cam mechanism. , The support shaft 1a corresponding to the rotation about the support shaft 17a of the first regulation body 17
It is designed to rotate around 8a. Here, the urging force K of the tension ammunition 18c is set to be larger (K> L) than the urging force L of the buffer coil ammunition 8b provided on the connecting link 8a of the sensing float 8. As a result, as will be described later, the regulation of the valve switching by the operation tool 16 is performed prior to the valve switching operation by the sensing control by the sensing float 8. Further, the restriction bodies 17 and 18 are provided with long hole-shaped loose fitting portions 17b and 18b, respectively.
The actuating pin 15 is movably and simultaneously fitted in. Here, the actuating pin 15 includes a connector 14b, a washer 14d, and a split pin.
Both fittings 17 and 18 are sandwiched between 14e and the loose fitting portion 17
It is fitted in b and 18b, thereby preventing the operating pin 15 from coming off and preventing backlash, and holding both restricting bodies 17 and 18.

When the operation tool 16 is set to the automatic position,
The two loose fitting portions 17b, 18b are substantially aligned with each other, and in this case, the operating pin 15 is lifted U of the operating pin 15 which operates in response to the planting depth control by the sensing float 8. The fixed S and all the movement strokes of the descending D are allowed (see FIG. 7W), and there is no restriction on the valve switching operation based on the automatic planting depth control by the sensing float 8 described above. It can be done freely without being done. On the other hand, when the operation tool 16 is operated upward and set to the semi-automatic position, the loose fitting portion 17b on the first regulating body 17 side is displaced in the direction of the arrow B with respect to the loose fitting portion 18b on the second regulating body 18 side ( In this case, the second regulator 18 is the cam surface 18 of the cam pin 20.
It is sufficient if it does not move from the case of the automatic position by pressing d, or if it does not block the lowering stroke D of the operating pin 15 as will be described later). The movement stroke of the pin 15 on the ascending stroke U side is blocked, which completely restricts the movement of the operating pin 15 to the ascending stroke U side (see FIG. 7X). The switching to the ascending side is restricted so that the valve switching is only neutral (fixed) and descending. Further, when the operating tool 16 is operated backward to the set position to the fixed position, when the first restricting body 17 rotates in the opposite arrow C direction, the second restricting body responds to this by the cam mechanism. The body 18 rotates in the direction of the arrow B opposite to the first restricting body 17 against the pulling ammunition 18c, whereby the two loose fitting portions 17b, 18b are displaced in opposite directions from each other and the operating pin is moved.
The movement stroke of 15 is narrowed from both sides, and as in the embodiment, the actuating pin 15 is in a state of being sandwiched by the ends of the two loose fitting portions 17b, 18b on the opposite sides at substantially the center position of the fixed stroke S position. As a result, the upward and downward movements are completely restricted (see Y in Fig. 7), which causes the hydraulic valve 12
Remains in the neutral state regardless of the sensing operation by the sensing float 8. When the operating tool 16 is further lowered and set to the raised position, the operating pin 15 will move to the free fitting portion.
It is forcibly moved to the ascending Stroke U side with the restriction state sandwiched by 17b and 18b from both sides (see Fig. 7Z), whereby the hydraulic valve 12 is switched to the ascending side and the hydraulic cylinder 11 extends. However, it is designed to raise the aircraft. In this way, the regulation mechanism 19 that regulates the free switching operation of the hydraulic valve 12 is configured, and the regulation mechanism 19 is provided on the operation tool 16 side.

In the embodiment of the present invention constructed as described above, the work of planting seedlings on the rice field is performed by the planting operation of the planting claws 5 which are timed to the running of the machine body. In the case of performing the above, the operation tool 16 is placed in the automatic position, and the hydraulic valve 12 is switched by sensing the planting depth by the sensing float 8 so that the seedling can be planted at a uniform depth. Then, when the aircraft is traveling, when planting seedlings are replenished, or when traveling on the road, the operation tool 16 is operated to the semi-automatic, fixed, and ascending positions as necessary.

As described above, in the embodiment of the present invention, the operation tool is
By the switching operation of 16, the free switching of the hydraulic valve 12 due to the sensing operation is regulated, and the machine can be fixed at a required height or the required manual vertical movement control can be performed. However, the regulation mechanism 19 that regulates the automatic switching of the hydraulic valve 12 has
It may be connected by a single connecting rod 14 instead of being connected by two operating wires, and converts the switching operation of the hydraulic valve 12 into a linear movement stroke of the operating pin 15. The movement stroke of the actuating pin 15 is adjusted by the loose fitting portions 17b and 18b formed in the two restricting bodies 17 and 18 by the operation tool.
The valve is regulated by restricting it by performing wide and narrow control by performing relative anti-movement via a cam mechanism linked to the switching operation by 16. Therefore, the structure of the restricting mechanism 19 is such that the operating pin 15 that moves in response to the switching of the hydraulic valve 12 and the two restricting bodies that are interlocked via the cam mechanism in which the loose fitting portions 17b and 18b are bored. It is not allowed that it is a very simplified structure composed of 17 and 18, and the regulation mechanism 19 is adjusted by adjusting the position of the operating pin 15 or the position of the loose fitting portions 17b and 18b. Therefore, it is extremely easy to perform, and therefore, the adjustment time at the time of assembly and inspection / maintenance in the factory is greatly shortened, and the workability can be improved. Here, the adjustment in the case of the embodiment is made by tightening adjustment of the operating pin 15 with the bolt 15a.

Further, when the planting depth control is automatically performed by the sensing float 8, the operating pin 15 is configured to freely move in the loose fitting portions 17b and 18b based on the hydraulic pressure sensing. Tool 16 hydraulic valve 12 for sensing planting depth
Therefore, the operation tool 16 can be set and fixed to other operation positions including the automatic position without moving according to the change of the operation tool.
There is no sense of instability that the 16 is constantly moving, and even if the operating tool 16 is touched by mistake during work or running on the road, the operating tool 16 will switch and the hydraulic mechanism will operate unnecessarily. It can be surely prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and it is possible to detect the relative anti-movement between the two loose fitting portions formed in the restricting body due to the switching operation of the operating tool. Anything can be used as long as it is configured so as to limit the movement stroke of the actuating body that moves following the operation and regulate the valve switching. It can be implemented.

[Effects] In summary, since the present invention is configured as described above, the restriction mechanism for restricting the automatic valve switching of the hydraulic mechanism includes one operating member that moves following the valve switching. An extremely simple structure can be formed by the two regulating bodies with which the actuating body fits.

Moreover, this valve switching restriction is performed by the two restricting bodies performing a relative anti-displacement movement by the cam mechanism to limit the movement stroke range of the actuating bodies that are simultaneously fitted into the two loose fitting portions. There is no need to consider the balance between the two operating wires as in the past, so adjustments are extremely easy and the adjustment time during assembly and inspection / maintenance at the factory is greatly shortened, improving workability. Will be measured.

[Brief description of drawings]

The drawings show one embodiment of a hydraulic mechanism switching restricting device in a paddy field working machine according to the present invention. Fig. 1 is an overall plan view of the rice transplanter, Fig. 2 is an overall side view of the rice transplanter, FIG. 3 is a schematic view of the hydraulic control mechanism, FIG. 4 is an enlarged side view of the control mechanism, FIG. 5 is an enlarged plan view of the same, FIG. 6 (A),
(B) is a side view of a main part of the hydraulic mechanism, a front view of the main part, FIGS. 7 (W), (X), (Y), and (Z) are explanatory views of the operation, and FIG. 8 is a view of the hydraulic mechanism. A circuit diagram and FIGS. 9A and 9B are a side view and a front view of the lever guide. In the figure, 1 is a traveling body, 3 is a traveling wheel, 12 is a hydraulic valve,
Reference numeral 15 is an operating pin, 16 is an operating tool, 17 is a first restricting body, 18 is a second restricting body, 18d is a cam surface, 19 is a restricting mechanism, and 20 is a cam pin.

Claims (1)

[Claims] 1. A paddy work machine in which the height of a machine body with respect to a traveling wheel or the height of a working portion with respect to a traveling portion is controlled by automatic valve switching operation of a hydraulic mechanism linked to a sensing mechanism. A restricting mechanism for automatically restricting the valve switching operation is provided with an operating body that moves in conjunction with the valve switching operation, a first restricting body that is displaced by the switching operation of the operation tool, and a first restricting body. And a second restricting body, and each of the restricting bodies is provided with a loose fitting portion into which the actuating body is movably fitted. With the above-mentioned configuration, the two control bodies are relatively anti-moved between the first control body and the second control body in accordance with the switching operation of the operation tool so that the movement stroke is limited to a wide range and the valve switching is performed. The cam mechanism that regulates Switching regulation device for a hydraulic mechanism in the paddy field working machine, characterized in that digit.