JPH0254043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating device for a walking type mobile agricultural machine for paddy fields, which automatically controls the elevation of the machine body in accordance with the unevenness or depth of the tiller.

In general, in a walking-type mobile agricultural machine for paddy fields that automatically controls the elevation of the machine, if it turns to the headland with automatic control, the machine will move if the mud pressure at the tip of the paddy sliding body decreases. Since it descends automatically, it is necessary to press the tip of the rice slider against the rice surface at all times to turn it around, and the pushing of mud from the tip of the rice slider disturbs the rice surface, significantly reducing planting accuracy. There were drawbacks such as mud running over the rice paddy sliding body during turning, making the operation of the rice paddy sliding body heavy, and mud pushing phenomenon occurring, which significantly reduced sensing accuracy.

Therefore, in order to solve this problem, there is a device that automatically raises the aircraft when cutting the planting clutch, but this method raises the aircraft to the highest position, so the aircraft rises too much, and after turning Even if the planting clutch is engaged at the start of the next stage of planting, the return of the aircraft to descent will be delayed and the planting work will begin without the paddy sliding body touching the ground. Inconveniences such as floating seedlings were occurring.

In addition, the only operating device for this type of walking-type mobile agricultural machine for paddy fields was a planting clutch lever and a lift handle for the machine body, which were installed independently and side by side. To do so, first cut the planting clutch lever to stop the planting device, then operate the lift handle separately to raise the aircraft, raise the rice paddy sliding body attached to the aircraft from the rice field, or lift the aircraft from the rice field. By lifting the control handle by hand, the rice field sliding body was lifted off the rice field, thereby reducing the mud pushing phenomenon caused by the rice field sliding body during turning and making it easier to move around. For this reason, in the past, turning operations on headlands and the like were troublesome, and the turning operation could not be easily and easily performed.

In view of the above-mentioned circumstances, the present invention was devised to eliminate the conventional drawbacks, and in particular,
A work clutch lever is connected to an operating body of the hydraulic switching valve, and when the working clutch is in a disengaged state by operating the working clutch lever, the hydraulic switching valve is held in a neutral position by restricting the movement of the linking mechanism in the downward direction of the aircraft; By configuring the structure so that the aircraft can only be raised using the aircraft height detection mechanism, when turning around on a headland, the aircraft can be raised by simply moving the work clutch lever from the engaged position to the point where it passes through the disengaged position. The aircraft is raised to a level that does not disturb the levelness of the headland area, and the aircraft is held so that it does not descend automatically, eliminating the inconvenience of the aircraft descending when turning. It is not only possible to simplify the operation of the time and easily and easily carry out quick and reliable turning without making mistakes, but after turning,
When the work clutch lever is moved to the on position, it can immediately return to the automatic control state, and when the next stage of planting work resumes, there will be no floating seedlings or poor planting posture. The present invention aims to provide an operating device for a walking type mobile agricultural machine.

To explain the configuration of the present invention with reference to an embodiment shown in the drawings, 1 is a rice field walker running on a tiller, which is equipped with an engine 2 at the front end and a planting device 3 at the rear end. The body of a rice transplanter is a type of mobile agricultural machine, and the front end of a swing case 4 is pivotally attached to the side of the body 1 via a pivot 4a so as to be able to swing up and down, and the rear end has an axle. A propulsion wheel 5 is mounted on a shaft via a shaft 5a, and the body 1 is moved up and down by swinging the swing case 4 up and down about a pivot 4a. 6
is a surface sliding body mounted on the underside of the aircraft body 1 so as to be able to move up and down. Reference numeral 7 denotes an arm that swings the swing case 4 up and down, and is connected to a hydraulic control device 8. The hydraulic control device 8 senses the height of the machine body 1 with respect to the rice field surface using the rice field sliding body 6, and adjusts the elevation of the machine body 1 to raise and lower the planting device 3 installed on the machine body 1 to a predetermined height above the rice field surface, i.e. It is equipped with an automatic control mechanism 20 (described later) that automatically maintains the planting depth and posture at a height regardless of the unevenness or depth of the tiller, but this automatic control mechanism 20 cannot be raised manually. It is designed to be switched to a semi-automatic state in which it can be operated in the raised position, neutral position and lowered position, or in a semi-automatic state in which it can operate in the raised direction.

Reference numeral 9 denotes a control handle extending in a curved manner upward rearward from the rear end of the fuselage 1, and the control handle 9 is provided with a crossbar 9a that straddles the opposite side. An operation panel 10 and a pivot shaft 11 are attached to the central portion of the body via a bracket 9b and a stay 9c.

Reference numeral 12 denotes a switching lever pivotally attached to the pivot shaft 11. The switching lever 12 constitutes an operating body of a hydraulic switching valve, which will be described later, and is connected to the hydraulic control device 8 via a wire 13. When the switching lever 12 is swung about the pivot shaft 11 against the tension of a spring (not shown), the automatic position 12A of the hydraulic control device 8 held by the tension of the spring is sequentially changed. Raised position 1
2B, neutral position 12C, and lowered position 12D. Reference numeral 14 denotes a hydraulic lever pivotally mounted on one side of the switching lever 12. The hydraulic lever 14 is slidably guided in a guide groove 15 formed in the operation panel 10, and is connected to the switching lever 12.
is pressed against the tension of the spring from the automatic position 12A toward the raised position 12B, the neutral position 12C, and the lowered position 12D. Note that the guide groove 15 is provided with the hydraulic lever 14 at position 1 corresponding to the raised position 12B of the switching lever 12.
4B, and a fixing groove 15 in which the hydraulic lever 14 is fixed at a position 14C corresponding to the neutral position 12C of the switching lever 12 and a position 14D corresponding to the lowered position 12D, respectively.
b, 15c are formed. The switching lever 12 and the hydraulic lever 14 are connected to each other by pawl clutches 12a and 14a formed on their opposing surfaces, and the tension of the spring causes the pawl clutch 12a of the switching lever 12 to be connected to the hydraulic lever 14. The front surface of the pawl clutch 14a in the rotating direction is pressed against it. Therefore, as the hydraulic lever 14 is operated, the switching lever 12 appropriately switches and controls the hydraulic control device 8, but even when the hydraulic lever 14 is fixed, the switching lever 12 can be swung in the direction against the spring. It is. Further, on the other side of the switching lever 12, a working clutch lever 17 connected to the planting device 3 via a wire 16 is pivotally mounted, and a claw clutch 12b formed on the other side of the switching lever 12 A claw clutch 17a formed on a working clutch lever 17 is opposed to the rear.
The switching lever 12 can be swung against the spring by the collision of these pawl clutches 12b, 17a.
17a is the position 17 when the working clutch lever 17 is turned off.
The switching lever 12 collides with the working clutch lever 17 for the first time when it is swung to the automatic position 12A by moving the working clutch lever 17 past the cutting position 17B and moving it over to the raising position 17C in the same direction as the cutting operation. can be pressed and moved to the raised position 12B. and hydraulic lever 1
4 is swung above the raised position 14B, and the switching lever 12 is swung to the raised position 12B, the neutral position 12C, or the lowered position 12D, the claw clutch 17a between the work clutch lever 17 and the switching lever 12, 12b does not occur. As shown in FIG. 5, a locking body 19 formed of a wire spring or the like is provided in the guide groove 18 that swings and guides the working clutch lever 17. The working clutch lever 17 is in the semi-automatic position 12E while switching the clutch lever 12 from the automatic position 12A to the raised position 12B.
A corresponding semi-automatic position 17 for locking the
A locking portion 19a at D is formed. and,
This locking body 19a is provided with a locking portion 19C that allows the work clutch lever 17 to collide at a position 17B where only the work clutch is disengaged and the switching lever 12 is not moved.

On the other hand, the automatic control mechanism 20 of the hydraulic control device 8 described above is constructed as shown in FIGS. 9A, B, C, D, and E. That is, in these figures, 2
Reference numeral 1 denotes an arm linked to the switching lever 12, and the arm 21 swings about a shaft 22, and pivotally supports a roller 21a that comes into contact with the lower surface of a lever 24 that swings about a shaft 23. , a link 26 connected to the lever 24 via a spring 25 and swinging about the shaft 23;
The rod cam 28 has a protruding pin 27 that can collide with the rod cam 28.
is pivoted.

A body height detection mechanism consisting of an indicator 29 that collides with the upper surface of the surface sliding body 6 and is moved up and down is attached to the end of the lever 24, and a rod 31 connects the link 26 and the hydraulic switching valve 30.
and are connected via a plate 32. Further, a pin 26a against which the lever 24 collides is implanted in the link 26 so that the link 26 rotates integrally when the lever 24 rotates clockwise.
In this way, the above-mentioned members constitute a linkage mechanism 8' of the hydraulic control device 8 that operates the hydraulic switching valve 30, and the hydraulic switching valve 30 and the aircraft height are detected through this linking mechanism 8'. The mechanism is linked to automatically control the height of the aircraft.

That is, in the automatic control mechanism 20 configured as described above, the switching lever 12 is moved to the automatic position 12A.
When the arm 2 is set as shown in Figure 9A,
The roller 21a pivotally connected to the lever 24 moves away from the lower surface of the lever 24, and the lever 24 swings as the indicator 29 moves up and down, and the link 26 and the spring 2
5 or pin 26a and rod 31, plate 32
The hydraulic switching valve 30 is swung through the . Therefore, the hydraulic switching valve 30 raises and lowers the machine body 1 and automatically adjusts the height of the machine body 1 relative to the field surface to a constant value, so that the planting device 3 is always maintained at a predetermined height above the field surface. Next, when the switching lever 12 is switched to the raised position 12B, the tension of the wire 13 causes the roller 21a of the arm 21 to move the lever 24 upward, as shown in FIG. 9B, and lower the hydraulic switching valve 30. Raise aircraft 1. When the switching lever 12 is positioned at the neutral position 12C, the link 26 is swung in the opposite direction by the pin 27 fixed to the rod cam 28 as shown in FIG. The hydraulic control device 8 is fixed by returning to the neutral position, and the switching lever 12 is further swung to the lower position 1.
When set to 2D, the pin 2 is set as shown in Fig. 9D.
7, the link 26 is greatly swung, the hydraulic switching valve 30 is moved upward, and the body 1 is lowered. Then, when the work clutch lever 17 passes through the cut position 17B and enters the cut state, the switching lever 12 becomes the semi-automatic position 12E in which the roller 21a collides with the lower surface of the lever 24 at an intermediate portion between the automatic position 12A and the raised position 12B. Even if the Tamen sliding body 6 descends and the lever 24 of the interlocking mechanism 8' tries to rotate in the downward direction of the aircraft, this rotation is caused by the roller 21a.
The hydraulic pressure switching valve 30 is held at the neutral position by the control. (See Figure 3E).

Next, the operation of the present invention constructed as described above will be explained.
The work clutch lever 17 is placed in the entry position 17A to perform the planting work.
At this time, the machine body 1 equipped with the planting device 3 is automatically controlled by the hydraulic control device 8 as described above, and is held at a predetermined height above the rice field regardless of the unevenness or depth of the tiller. Planting is performed at a predetermined planting depth. In this situation, if you want to turn the aircraft 1 around the headland etc., enter position 17.
Turn off the working clutch lever 17 at position 17.
By operating the planting device 3 until it passes through B, the planting device 3 can be stopped, and the switching lever 12, which was located at the automatic position A, changes the roller 21a to the lever 24 at the intermediate position between the automatic position 12A and the raised position 12B. Semi-automatic position 12E in contact with the bottom surface of
Therefore, even if the Tamen sliding body 6 descends and the lever 24 attempts to rotate downward to lower the aircraft, the rotation is blocked by the roller 21a, and the hydraulic switching valve 30 is held at the neutral position. . Therefore, the operation of the interlocking mechanism 8' in the downward direction of the aircraft is restricted, and the operation is only possible in the upward direction.
When turning around a headland, the aircraft can be easily and easily turned quickly and reliably with the aircraft raised to the limit without disturbing the levelness of the headland area. Mud pushing from the tip of the rice paddy sliding body 6 may disturb the rice field and significantly reduce planting accuracy, or mud may ride on the rice field sliding body 6, making its operation heavier, or the mud pushing phenomenon may occur. There is no fear that the sensing performance will be degraded.

In addition, since the aircraft is held in a substantially neutral position (semi-automatic position) when turning, when the work clutch lever 17 is operated to the engaged position after turning, the roller 21a is separated from the lower surface of the lever 24 and the machine is automatically activated. The control state is restored, and the planting device 3 can be quickly and accurately held at a predetermined height above the rice field regardless of the unevenness or depth of the tiller. The planting work is not started without the sliding body 6 being in contact with the ground, and therefore there is no risk of floating seedlings or poor planting posture occurring.

In short, the present invention provides a walking-type mobile agricultural machine for rice fields that can automatically control the height of the machine in which a hydraulic switching valve and a machine height detection mechanism are linked via a linkage mechanism of a hydraulic control device. A work clutch lever is connected to the operating body of the valve, and when the work clutch is disengaged by operating the work clutch lever, the movement of the linkage mechanism in the downward direction of the aircraft is restricted to hold the hydraulic switching valve in the neutral position, and the height of the aircraft is adjusted. Since the structure is configured so that only the aircraft can be raised using the headland detection mechanism, when turning around at the headland, the aircraft can be raised to the headland by simply operating the working clutch lever in a single operation from the on position to the time when it passes through the off position. It is possible to raise the levelness of the ground part to the limit without disturbing it, and to hold the aircraft so that it does not descend automatically, eliminating the inconvenience of the aircraft descending when turning. It is not only possible to simplify the operation and easily and easily carry out quick and reliable turning without erroneous operation, but also to immediately return to the automatic control state when the clutch lever is operated to the engaged position after turning. This provides an extremely useful novel effect in that it can completely eliminate floating seedlings or poor planting posture when restarting the next planting process.

[Brief explanation of drawings]

The drawings show an embodiment of the operating device for a walking-type mobile agricultural machine for paddy fields according to the present invention, in which FIG. 1 is an overall side view of the rice transplanter, FIG. 2 is a perspective view of the operating device, and FIG. 3 is a perspective view of the operating device. is an exploded perspective view of the main parts, Fig. 4 is a front view of the main parts, Fig. 5 is a side view of the main parts, Fig. 6 is a side view showing the relationship between the switching lever and the hydraulic lever, and Fig. 7 is the switching A side view showing the relationship between the lever and the working clutch lever, FIG. 8 is a front view of the locking body, FIG. 9A is a side view of a part of the hydraulic control device in an automatic position state, and FIG. 9B is an improved state. Side view in position, No. 9
FIG. 9C is a side view of the same as the above in the neutral position state, FIG. 9D is a side view of the same as the above in the lowered position, and FIG. 9E is a side view of the same as the above in the semi-automatic position. In the figure, 1 is the fuselage, 3 is the planting device, 5 is the propulsion wheel, 6 is the field sliding body, 8 is the hydraulic control device, 8' is its linkage mechanism, 12 is the switching lever, 14 is the hydraulic lever, 17 is the operation It's a clutch lever.

Claims (1)

[Claims] 1. In a walking-type mobile agricultural machine for rice fields that can automatically control the height of the machine in which a hydraulic switching valve and a machine height detection mechanism are linked via a linking mechanism of a hydraulic control device, the operating body of the hydraulic switching valve is operated. The clutch lever is connected, and when the work clutch is disengaged by operating the work clutch lever, the operation of the above-mentioned linkage mechanism in the downward direction of the aircraft is restricted, the hydraulic switching valve is held in the neutral position, and the aircraft height detection mechanism is used to raise the aircraft. An operating device for a walking type mobile agricultural machine for paddy fields, characterized in that it is configured to enable only the following operations.