JPH074088B2 - Switching control device for hydraulic mechanism in paddy work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a switching mechanism for a hydraulic mechanism in a paddy working machine such as a rice transplanter or a seeder.

[Problems to be Solved by Prior Art and Invention] Generally, in this kind of paddy field working machine, the height of the machine body relative to the traveling wheels as in the case of a walking type rice transplanter, or the working portion for the traveling part as in the riding type rice transplanter. The height is controlled by an automatic valve switching operation of a hydraulic mechanism linked to a sensing mechanism such as a sensing float that senses a rice field, but when the aircraft is traveling or when planting seedlings are replenished, Alternatively, when the vehicle is traveling on the road, automatic valve switching of the hydraulic mechanism is restricted so that the machine body can be transformed into a desired machine body posture with respect to the traveling wheels. However, conventionally, the regulation mechanism for performing this regulation control is provided on the hydraulic mechanism side,
The operating tool is provided at a position where the operating handle can be operated separately from the hydraulic mechanism. However, in this case, the operating stroke for valve switching may be small,
There is no choice but to configure so that the movement of the regulation mechanism can be made small so that the valve can be switched. Moreover, due to the play in the connecting inclusion between the operation instrument and the regulation mechanism, the response of the regulation mechanism to the operation instrument can be improved. It becomes worse, and when it is terrible, there is a gap, and in some cases there is a problem such as intentionally switching with the operating lever but not actually switching, and it is extremely difficult to adjust it, and it is extremely difficult to assemble at the factory. However, there were drawbacks such as time-consuming adjustments during maintenance and inspections, which was a problem.

[Means for Solving the Problem] The present invention was conceived with the object of providing a switching mechanism for a hydraulic mechanism in a paddy working machine that can eliminate these drawbacks in view of the above-mentioned circumstances. hand,
A valve switching actuating member provided in a hydraulic mechanism that controls the height of the machine body with respect to the traveling wheels or the height of the working unit with respect to the traveling unit is interlocked with a sensing mechanism for sensing the paddy field to detect the paddy field. In a paddy work machine configured to perform the height control by automatic valve switching of a hydraulic mechanism based on the regulating mechanism, a regulating mechanism for regulating the automatic valve switching operation by the sensing mechanism, and the regulating mechanism. In providing an operating tool for restricting and releasing the restriction, the base end portion of the connecting member is interlockingly connected to the operating member so as to operate in response to the valve switching operation of the operating member, and the distal end portion of the connecting member is connected. , Is arranged near the position where the driver is in the field work posture, and the regulating mechanism is provided at the tip of the connecting member to regulate the operation in response to the actuating body of the tip of the connecting member. It is characterized in that the braking mechanism was allowed extending the operating member in the operation range of the driver's field working posture.

Further, according to the present invention, the regulation mechanism surely responds to the switching operation of the operation tool to prevent the occurrence of malfunction, and the adjustment can be easily performed.

[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.

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 provided with an operating plate (corresponding to an operating member of the present invention) 13 urged by a return bullet 13a. It is provided integrally. The sensing float 8 is connected to the operating plate 13 via a connecting link 8a with a counterbalance machine 8b,
As a result, the operating plate 13 is linked to a sensing mechanism for sensing the rice field. 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 and extends, and the chain case 10 is moved downward to move the machine body 1
Is relatively moved with respect to the traveling wheel 3 to remove the deep planting. Conversely, when the sensing float 8 is lowered due to the shallow planting state, the hydraulic pressure is reversed. Valve 12
Switches from neutral to descending side, which allows the hydraulic cylinder to
11 is reduced to move the machine body 1 downward to remove shallow planting, and in this way, hydraulic control is automatically performed so that the planting depth is approximately constant. ing.

A base end portion of a connecting rod (a connecting member of the present invention) 14 is further pivotally connected to the operating plate 13, and the tip end portion of the connecting rod 14 is in a state in which a swing arm 14a is interposed in the middle. It is arranged at a side portion of the driving handle 6, that is, in the vicinity of a posture position where the driver grips the driving handle 6 to work, and further, a substantially L-shaped connecting tool 14b is provided at the tip of the bolt. The position is fixed by 14c. The connecting pin 14b is integrally provided with an actuating pin 15, whereby the actuating pin 15 is configured to respond to the actuation of the actuating plate 13. On the other hand, 16 is an operation lever that is an operation tool provided on the side of the driving handle 6, and 17 is a first restricting body that rotates about a support shaft 17a as a fulcrum, but the base end portion of the operation lever 16 is It penetrates through an engagement hole 17c formed in one regulating body 17 and is rotatably supported by a pin shaft 17d fixed to the first regulating body 17 in the axial direction. And operating lever
16 is each guide position of the lever guide by the coil ammunition 17e wound around the pin shaft 17d (semi-automatic position, automatic position, automatic position, fixed position, and ascended position where automatic control is performed only from the upper side, lowering and fixing). ) Is urged toward the side to be engaged with the guide groove, and it is disengaged from the guide groove by operating against the coil ammunition 17e, and is moved to the desired guide groove position along with the lever guide 21. It is possible to freely switch operations.

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 parallel, but the second regulation body 18 is the first regulation body. Cam pin 20 on body 17
It is urged by the tension bullet 18c so that the cam surface 18d is pressed. Here, the urging force K of the tension ammunition 18c is set to be larger than the urging force L of the loose balance ammunition 8b (K> L). Further, the restriction bodies 17 and 18 are provided with long hole-shaped loose fitting portions 17b and 18b, respectively, and the operation pin 15 is movably fitted into the loose fitting portions 17b and 18b. There is. When the operating lever 16 is set to the automatic position, the loose fitting portions 17b and 18b are substantially aligned with each other. In this case, the actuating pin 15 has the planting depth by the sensing float 8. Of the actuating pin 15 which operates in response to the height control, is allowed to move up and down, fixed S, and down in the entire moving stroke (7th step).
(See FIG. W), the valve switching operation based on the automatic planting depth control by the sensing float 8 described above can be freely performed without any restriction. On the other hand, if you operate the operating lever 16 upward to set it to the semi-automatic position,
The loose fitting portion 17b on the first regulating body 17 side is the loose fitting portion 1 on the second regulating body 18 side.
8b is displaced in the direction of arrow B, the movement stroke of the operating pin 15 on the upward stroke U side is blocked, and the movement of the operating pin 15 to the upward stroke U side is completely restricted (X in FIG. 7).
As a result, the switching of the hydraulic valve 12 to the rising side is restricted, and the valve is in a semi-automatic state in which the valve is switched only to neutral (fixed) and lowered. On the other hand, when the operation lever 16 is operated downward to the set position to the fixed position, the first regulating body 17 rotates in the opposite arrow C direction,
The second restricting body 18 rotates in the direction of arrow B against the tension bullet 18c, whereby the two loose fitting portions 17b, 18b are displaced in opposite directions from each other, and the two loose fitting portions at the fixed stroke S position. The movement between the upward and downward sides is completely restricted by being sandwiched between the opposite ends of 17b and 18b (see Y in FIG. 7), whereby the hydraulic valve 12 is The neutral state is maintained 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 actuating pin 15 is forcibly moved to the ascending strooke U side while being kept in a restricted state sandwiched by the loose fitting portions 17b and 18b from both sides (7th position). (See FIG. Z), whereby the hydraulic valve 12 is switched to the upward side, the hydraulic cylinder 11 extends, and the machine body is raised. In this way, the regulation mechanism 19 that regulates the free switching operation of the hydraulic valve 12 is provided on the side of the operation lever 16 which is the operation tool.

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 operation lever 16 is set to the automatic position, and by switching the hydraulic valve 12 by detecting the planting depth by the sensing float 8, seedlings of uniform depth can be planted. When operating the aircraft, supplying planting seedlings, or driving on the road, the operating lever
The 16 will be operated in semi-automatic, fixed and raised positions as required.

As described above, in the present invention, the free switching control of the hydraulic valve 12 is restricted by the switching operation of the operation lever 16,
Although it is possible to perform the required vertical movement control of the machine body, the control mechanism 19 that controls the switching control of the hydraulic valve 12 has an operation lever that can be operated by the driver in the field work posture.
It will be installed on the 16 side, and as a result, the operation lever 16
The responsiveness of the regulation mechanism 19 to the is significantly improved, and the operation lever 16 and the regulation mechanism 19 are not displaced in operation. Moreover, the operating stroke of the regulation mechanism 19 can be freely set without being confined to the slight operating stroke of the hydraulic valve 12, thus facilitating the adjustment of the hydraulic valve 12 and, therefore, assembling at the factory or The adjustment time during inspection and maintenance will be greatly shortened, and workability will be improved. Here, the adjustment in the case of the embodiment can be extremely easily performed by adjusting the position of the pin shaft 15. Moreover, since the regulation mechanism 19 is provided on the operation lever 16 side, this adjustment work can be performed without being disturbed by various members incorporated in a narrow space like the one provided in the hydraulic mechanism section. As a result, the adjustment work itself becomes easier, and the regulation mechanism 19
Is placed at a high position far from the paddy field, so that mud is prevented from adhering, and even if temporary cooling mud or the like adheres, inspection and cleaning can be easily performed.

Needless to say, the present invention is not limited to the above-mentioned embodiment, but in particular, the operation tool is not limited to the operation lever, but may be an operation button or other operation tool that regulates the switching control of the hydraulic mechanism. The means does not matter. Further, the connecting structure between the restriction mechanism and the hydraulic mechanism may be any means as long as it is controlled so that the switching control of the hydraulic mechanism is performed by the switching operation of the operation tool. Further, it may be a two-wheel type instead of a one-wheeled type, or a riding type rice transplanter.

[Advantageous Effects] In short, since the present invention is configured as described above, the regulating mechanism for regulating the valve switching by the switching operation of the operation tool is not the hydraulic mechanism side as in the past, but the field work. It is arranged on the side of the operating tool that can be operated by the driver in the posture, and therefore, the responsiveness of the restricting mechanism to the switching operation of the operating tool is improved, and a deviation occurs in the operation of the operating tool and the restricting mechanism. Without such a situation, it is possible to perform reliable and reliable regulation control of the hydraulic mechanism.

Moreover, the operating stroke of the restriction mechanism can be freely set without being obscured by the slight valve switching stroke in the hydraulic mechanism, and therefore, these adjustments are facilitated, and therefore, the assembly and inspection in the factory are performed. Adjustment time during maintenance will be greatly shortened and workability will be improved.

[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 part, a front view of the main part, FIGS. 7 (W), (X), (Y), and (Z) are operation explanatory views, and FIG. 8 is a hydraulic circuit diagram. Is. In the figure, 1 is a traveling body, 3 is a traveling wheel, 12 is a hydraulic valve,
Reference numeral 16 is an operating lever, and 19 is a regulation mechanism.

Claims (1)

[Claims] 1. A valve switching actuating member provided in a hydraulic mechanism for controlling the height of a vehicle body with respect to a traveling wheel or the height of a working portion with respect to a traveling portion is interlocked with a sensing mechanism for sensing a rice field. In a paddy work machine configured to perform the height control by automatic valve switching of a hydraulic mechanism based on the field detection, a regulating mechanism for regulating automatic valve switching operation by the sensing mechanism, ,
In providing an operating tool for restricting and releasing the restriction by the restricting mechanism, the base end portion of the connecting member is interlockingly connected to the operating member so as to operate in response to the valve switching operation of the operating member, and the connecting member. The distal end of the connecting member is arranged near the position where the driver is in the field work posture, and the regulating mechanism is provided at the distal end of the connecting member in order to regulate the operation in response to the actuating body of the connecting member distal end. A switching mechanism for a hydraulic mechanism in a paddy work machine, wherein an operation tool is extended from the restriction mechanism to a range in which a driver in a field work posture can operate.