JP2000106723A - Hydraulic controller for mobile agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the lifting and lowering of an operating part and control the engagement and disengagement of an operating clutch only when an operating lever is operated to a fixed position at the time of starting an engine. SOLUTION: This hydraulic controller for a mobile agricultural machine comprises a transplanting part 10 supported by a mobile machine body 5 and capable of lifting when operating a manual operating lever 17 to a lifting position, stopping at an optional height when operating the manual operating lever 17 to a fixed position, lowering when operating the manual operating lever 17 to a lowering position and further engaging a transplanting clutch when operating the manual operating lever 17 to a transplanting position. The hydraulic controller is capable of controlling the lifting and lowering of the transplanting part 10 and controlling the engagement and disengagement of the transplanting clutch only when the manual operating lever 17 is operated to the fixed position at the time of starting an engine. If the manual operating lever 17 is not located at the fixed position at the time of starting the engine, a hydraulic control valve 35 is forcibly rotated so as to provide the same position as that for operating the operating lever 17 to the fixed position, and the transplanting part 10 is held at the height before starting the engine to automatically disengage the transplanting clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine in which a working unit is supported on a traveling machine so as to be able to move up and down. More specifically, the operating lever is operated only when the operating lever is operated at a predetermined position when the engine is started. TECHNICAL FIELD The present invention relates to a hydraulic control device for a mobile agricultural machine, which enables lifting and lowering control of a working unit by using a computer.

[0002]

2. Description of the Related Art Conventionally, the raising and lowering control of a planting section supported by a riding rice transplanter is performed by hydraulic pressure, and a hydraulic control mechanism for controlling the hydraulic pressure is applied to a side of a seat 7 as shown in FIG. A planting lever 17 is provided, and the planting unit 10 is controlled to move up and down by manual operation of the lever 17 and the lever 17 is operated to a “lower (automatic)” or “planting (automatic)” position. Then, the planting unit 10 is automatically moved up and down so that the planting unit 10 is located at an appropriate planting position by sensing the earth pressure acting on the float 14 of the planting unit 10.

That is, the hydraulic / planting lever 17 is
When the user operates the “up”, “fix”, “lower (automatic)”, and “planting (automatic)” positions along the lever guide 21 shown in FIG. 7, the flat cam 30 rotates about the fulcrum shaft 31. The hydraulic control valve 35
Is operated, and a hydraulic cylinder (not shown) is controlled by the hydraulic control valve 35, so that the planting section 10 supported by the lifting link mechanism 8 is controlled to move up and down. At the "planting (automatic)" position of the hydraulic / planting lever 17, the planting clutch is engaged.

At this time, for example, when the hydraulic pressure / planting lever 17 is set to the "lower (automatic)" or "planting (automatic)" position, and the planting section 10 is in the automatic hydraulic pressure lowering position, the float 1
When earth pressure acts on 4 and its front part is lifted, through the sensing plate 22, the swing arm 27 and the sensing rod 24,
The lever arm 71 swings about the pivot connecting portion 23, and the hydraulic control valve 3
5 is moved to the automatic raising position to raise the planting portion 10, and conversely, when the earth pressure acting on the float 14 is small and its front portion is lowered, the hydraulic control valve 35 is moved to the automatic lowering position and the planting is performed. The part 10 is lowered.

[0005]

Conventionally, the engine is turned off while operating the hydraulic / planting lever 17 at the "up" position or the "planting (automatic)" position. When the engine is started, the planting unit 10 may be inadvertently lifted or the planting clutch may remain engaged, and the parts may be damaged, even though the driver does not operate the hydraulic / planting lever 17 at all. was there.

The present invention has been made to solve such a problem, and an object of the present invention is to operate the operating lever only when the operating lever is operated at a predetermined fixed position when the engine is started. It is an object of the present invention to provide a hydraulic control device for a mobile agricultural machine that enables raising and lowering control of a working unit and on / off control of a work machine clutch, thereby preventing inadvertent operation of the working unit and preventing damage to parts.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a working unit (10) is supported on a traveling body (5) by a hydraulic actuator (19) so as to be able to move up and down. The working unit (10) is connected to the operation lever (17).
To the predetermined raising position, and raise the operation lever (1).
7) A hydraulic control valve (35) for controlling to stop at an arbitrary height position by operating the predetermined fixed position and to lower the operating lever (17) by operating the operating lever (17) to the predetermined lowering position is provided. In the mobile agricultural machine (1) in which the work machine clutch is engaged by operating to the position, the operation lever (1)
7) detecting means (50) for detecting the operating position, and detecting that the operating lever (17) has been operated to the fixed position by the detecting means (50) at the time of engine start, thereby performing the operation. A control unit (39) for enabling control of raising and lowering of the work unit (10) by a lever (17) and on / off control of a work machine clutch, and when the engine is started, the operation lever (17) is in the fixed position. When it is not operated, control is performed such that the work machine clutch is forcibly disengaged and the work unit (10) is held at a position before the engine is started.

According to a second aspect of the present invention, an alarm means (63) for issuing an alarm based on a signal from the detection means (50) when the operation lever (17) is not operated to the fixed position when the engine is started. It is characterized by having.

[Operation] Based on the above-mentioned invention specifying matter, the movable agricultural machine (1) is provided with a working unit (10) supported by a hydraulic actuator (19) so as to be able to move up and down freely by an operation lever (1).
7) The operation is raised to a predetermined “up” position, and the operation is moved to a predetermined “fixed” position to stop at an arbitrary height position.
Further, a hydraulic control valve (35) for controlling the lowering by operation to a predetermined “down” position is provided, and when the operation is further moved to the “planting” position, the work machine clutch is engaged.

The operating position of the operating lever (17) is detected by the detecting means (50), and the control unit is operated only when the operating lever (17) is operated to the "fixed" position when the engine is started. With (39), the lifting / lowering control of the working unit (10) and the ON / OFF control of the working machine clutch by the operating lever (17) are enabled.

If the operating lever (17) is not operated to the "fixed" position when the engine is started, the same position (oil pressure) as when the operating lever (17) is operated to the "fixed" position is used. The hydraulic control valve (35) is forcibly rotated so as to be in a fixed position.
In this way, when the operation lever (17) is not at the "fixed" position at the time of engine start, the work unit (10) is maintained at the height position before the engine start and the work machine clutch is automatically disengaged. Do.

Note that the reference numerals in parentheses described above are shown for reference to the drawings, and do not limit the present invention in any way.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Members that are the same as or correspond to those of the above-described conventional example are denoted by the same reference numerals.

As shown in FIG. 1, the riding rice transplanter 1 has a traveling machine body 5 supported by a front wheel 2 and a rear wheel 3, and the traveling machine body 5 has a hood 4 at a front portion of the front wheel.
An engine 6 is mounted inside the vehicle, and a driver's seat 9 having a seat 7 is provided at an intermediate portion of the traveling machine body 5 in the front-rear direction. At the side of the seat 7, a manual operation lever 17 is provided.
The manual operation lever 17 can be moved up, fixed,
It can be operated at each position of "lower (automatic)" and "planting (automatic)".

At the rear of the traveling machine body 5, a planting section 10 as a working section is supported via a lifting link mechanism 8 so as to be able to move up and down freely, and the planting section 10 has a large number of planters and floats 1
4 and a seedling placing table 12 on which mat seedlings can be placed in the vertical direction.

A hydraulic cylinder device 19 is disposed between the traveling body 5 and a link bracket 20 fixed to the lifting link mechanism 8, and the lower portion of the seat 7 is operated based on the operation of the manual operation lever 17. The hydraulic control valve 35 disposed in the rear cover 26 is controlled, and the hydraulic cylinder device 19 is controlled to expand and contract by the hydraulic control valve 35, so that the planting section 10 moves up and down.

According to the present invention, the detecting means for detecting the operating position of the operating lever 17 and the detecting means that the operating lever 17 has been operated to the fixed position by the detecting means at the time of starting the engine are provided. The control unit is provided with a control unit capable of controlling the lifting and lowering of the work unit 10 by the operation lever 17 and the on / off control of the work machine clutch.

That is, the operation position of the manual operation lever 17 is detected by a lever position detection potentiometer 50, and the cam rotation is performed via a control unit 39 disposed near the hydraulic control valve 35 in accordance with the detected value. The motor 41 is rotated, and the hydraulic control valve 35 is controlled by the operation of the operation mechanism 40 as described later.

When the manual operation lever 17 is operated to the "up" position, the planting section 10 is raised, and when the manual operation lever 17 is operated to the "fixed" position, the planting section 10 stops at an arbitrary height position.
When operated to the "lower (automatic)" position, the planting section 10 is lowered, and when operated to the "planting" position, the work implement clutch (not shown) is engaged.

Here, a mechanism for raising and lowering the planting section 10 by the manual operation lever 17 will be described.

As shown in FIG. 2, the hydraulic control valve 35 is provided in the rear cover 26 below the seat 7.
The hydraulic control valve 35 is operated by the operating mechanism 40. The operation mechanism 40 includes a cam rotation motor 41 disposed near the hydraulic control valve 35, a small gear 42 that rotates integrally with the motor shaft of the cam rotation motor 41,
And a flat plate cam 30 rotatable about a fulcrum shaft 31. A cam position potentiometer 43 for detecting the rotation angle of the fulcrum shaft 31 (that is, the rotation angle of the flat cam 30) is attached to the fulcrum shaft 31 of the flat cam 30.

A valve operating plate 36 is fixed to the operating shaft 35a of the hydraulic control valve 35, and the hydraulic hoses 32, 33
Are connected to the hydraulic cylinder 19 (see FIG. 1) and a hydraulic pump (not shown). The flat cam 30, the hydraulic control valve 35 and the valve operating plate 36 are
They are arranged to overlap in side view.

As shown in FIG. 3, the flat cam 30 is
Said gear portion 30a partially formed on the cam periphery;
It has a large concave portion a, a small convex portion b, a land portion c, and a flexible concave portion f. The large concave portion a is formed of a cam surface that comes into contact with a roller 45 rotatably supported at the tip of a cam arm 44. The accommodating concave portion f is formed in a concave portion for receiving the pin 36a implanted in the valve operating plate 36. The accommodating concave portion f allows the movement of the pin 36a in the concave portion f to constitute an accommodating mechanism (automatic range). the pin 36a on one side f ₁ of the recess f abuts moves together (manual operation).

The cam arm 44 is rotatably supported on a support shaft 46. The other end of the cam arm 44 is connected to a planting clutch (not shown) via a rod 47. As a result, the large recess a performs the on / off operation of the planting clutch.

In FIG. 2 described above, an interlocking arm 48 interlocking with the float 14 is rotatably supported on the operating shaft 35a of the hydraulic control valve 35, and the tip of the interlocking arm 48 is connected to a continuous traction link 49. And the sector gear 52. The sector gear 52 is provided at the fulcrum 23.
The pivot 23 is provided with a potentiometer 57 for detecting the amount of rotation of the sector gear 52, and the amount of rotation of the hydraulic control valve 35 is detected by the potentiometer 57. A small gear 56 driven by a valve rotation motor 55 meshes with the sector gear 52. The continuous traction link 49 connected to the sector gear 52, the interlocking arm 48 and the valve operating plate 36 The hydraulic control valve 35 is controlled via the.

On the other hand, as shown in FIG. 2, a swing arm 27 which is rotatable about a fulcrum shaft 25 is provided at a rear portion of the lifting link mechanism 8, and the swing arm 27 is provided on the sensing plate 22. Is connected to the front part of the float 14 via the. The swing arm 27 and the sensing plate 22
A pin 28 fitted in the long hole 22a of the sensing plate 22
Are connected via And, the vertical movement of the float 14 based on the earth pressure fluctuation acting on the float 14,
It is detected by the float position potentiometer 58, and the valve rotation motor 55 rotates based on the detected value,
The hydraulic control valve 35 is controlled so that the hydraulic cylinder device 19 (see FIG. 1) expands and contracts.

Referring again to FIG. 3, the valve operating plate 36
Is provided with a linking pin 36b.
6b abuts on the interlocking arm 48,
It can work together with. The link pin 36b and the pin 53 implanted in the sector gear 52
The tension of the spring 54 is transmitted to the valve operation plate 36 via a pin 36b that is in contact with one side of the interlocking arm 48. A spring 37 is stretched between the body frame and the pin 53, and presses and urges the hydraulic control valve 35 in one direction by the spring 37.

FIG. 4 is a control block diagram according to the present embodiment.

In the figure, the control unit 39 includes a lever position detection potentiometer 50 for detecting the operation position of the manual operation lever 17 and a changeover switch 51 for detecting the operation of a hand operation lever 38 described later (a vertical direction changeover switch 51). -1, a front-rear changeover switch 51-2), a signal from the flat cam position potentiometer 43 is input, and a signal from a seedling warning switch 60, a back switch 62, a planting switch 64, a horn switch 66, and the like is input. Have been.

Based on the input signals, the cam rotation motor 41 is controlled via the control section 39, and the seedling supply monitor lamp 61, the planting monitor lamp 65, the buzzer 63, and the horn 67 are turned on or sounded. It is supposed to.

As described above, the lever position detection potentiometer 50 for detecting the operation position of the manual operation lever 17 is provided.
Is electrically connected to the cam rotation motor 41 via the control unit 39, and "lifts" the manual operation lever 17.
When the operator operates the "fixed", "lowered", or "planted" position, the operation position signal is sent to the control unit 39, the cam rotation motor 41 is operated, and the flat cam 30 is rotated. The hydraulic control valve 35 is controlled via 36.

As described above, the operation position of the manual operation lever 17 is detected by the lever position detection potentiometer 50. In this embodiment, the control unit 39 is used.
When the key-on engine is started, it is detected that the manual operation lever 17 has been operated to the “fixed” position, so that the elevation control of the planting section 10 by the manual operation lever 17 and the engagement of the work machine clutch are performed. Off control is possible.

FIGS. 5A and 5B show a control flowchart at this time.

FIG. 5A shows that the elevation of the planting section 10 can be controlled on condition that the lever position is in the "fixed" position. In S1, the operation position of the manual operation lever 17 is changed to " It is determined whether the position is the "fixed" position. If the position is the "fixed" position, the process proceeds to S2. If the position is not the "fixed" position, in steps S3 to S5, the buzzer 63 as the alarm means shown in FIG. At the same time, the planting monitor lamp 65 blinks. In S2,
It is determined whether or not the buzzer flag has been reset. If the buzzer flag has been reset, the lever flag is set in step S6. Then, the buzzer flag is reset, and the process proceeds to S6 described above.

Next, FIG. 5B relates to control at the time of engine start. If the flat cam 30 is not in the "fixed" position at the time of engine start in S11, the cam rotation motor 41 is forcibly driven. Then, the flat cam 30 is rotated to the "fixed" position. In S12, it is determined whether or not the lever flag is set.
In step 3, the hydraulic control of the planting section 10 is enabled, and if not set, the lever position is set in step S14, and the process returns to step S12.

That is, if the manual operation lever 17 is not operated to the "fixed" position when the engine is started with the key ON, the buzzer 63 as an alarm means sounds and the control unit 39 controls the cam rotation motor 41 to operate. Control is performed to forcibly operate and rotate the flat cam 30 to the “fixed” position. As described above, the flat cam 30 rotates the hydraulic control valve 35 and engages and disengages the planting clutch. Therefore, when the flat cam 30 is forcibly turned to the “fixed” position, the planting is performed. The attachment portion 10 is held at a position before the engine is started, and the planting clutch is automatically disengaged.

This prevents inadvertent mechanical operation and allows the driver to recognize that the manual operation lever 17 has not been operated to the "fixed" position when the engine is started. In this case, by operating the manual operation lever 17 to the “fixed” position again, the elevation control of the planting section 10 and the on / off control of the planting clutch by the manual operation lever 17 become possible.

As shown in FIG. 1, a steering wheel 13 is provided in front of the driver's seat 9, and a switch box 15 is provided on a steering shaft below the steering wheel 13. A hand operation lever 38 is attached to the box 15.

Only when the manual operation lever 17 is operated to the "planting" position, the hand operation lever 38 can control the elevation of the planting section 10 by the operation. The hand operation lever 38 can be operated independently in the vertical direction and in the longitudinal direction of the machine substantially orthogonal thereto, and is biased by a resilient member (not shown) to automatically return to the reference position when the hand is released. Have been. By the operation in the vertical direction, the reference position, the raised position displaced upward from the reference position, the lowered position displaced downward from the reference position, and the hand-operated lever 38 was displaced downward again after starting to descend. The operation can be freely switched to the planting position.

The operation of the hand operation lever 38 in the vertical direction is determined by a changeover switch 51-1. A control signal from the changeover switch 51-1 causes the cam rotation motor 4 to operate.
1, the flat cam 30 is rotated, and the hydraulic control valve 35 is controlled via the valve operation plate 36.

Thus, when the hand operation lever 38 is operated in the up-down direction, the cam rotation motor 41 causes the flat cam 3 to move.
0 is driven, and the amount of rotation of the flat cam 30 about the fulcrum shaft 31 is detected by a potentiometer 43. The rotation of the flat cam 30 causes the hydraulic control valve 35 to rotate via the pin 36a, and the hydraulic cylinder device 1
The planting part 10 is controlled to move up and down by the expansion and contraction of 9.

If, for example, the hand operation lever 38 is pulled backward while the planting section 10 is moving up and down, the operation content is determined by the changeover switch 51-2. The rotation of the cam rotation motor 41 is immediately stopped by the control signal.

[0043]

As described above, according to the first aspect of the present invention, only when the operation lever is operated to the predetermined fixed position at the time of starting the engine, the working unit is controlled to be lifted and lowered by the operation lever. By enabling the on / off control of the clutch, it is possible to prevent, for example, the working unit from being inadvertently moved up and down, even though the operating lever is not operated at all when the engine is started. The work machine clutch is turned on as soon as it moves up and down,
It is possible to prevent the possibility that the working part collides with the road surface or the like and the components of the body are damaged.

According to the second aspect of the invention, when the operation lever is not operated to the predetermined fixed position when the engine is started, an alarm is issued so that the operator can operate the operation lever to the fixed position. You can immediately recognize that there is no.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a riding rice transplanter to which the present invention is applied.

FIG. 2 is a side view showing an overall configuration of a hydraulic control mechanism.

FIG. 3 is an enlarged view of a main part of the above.

FIG. 4 is a control block diagram in the present embodiment.

FIGS. 5A and 5B are control flowcharts according to the present embodiment.

FIG. 6 is a side view showing an overall configuration of a hydraulic control mechanism in a conventional riding rice transplanter.

FIG. 7 is a view showing an operation position of a conventional manual operation lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding rice transplanter 5 Traveling body 8 Elevating link mechanism 10 Implantation part 17 Manual operation lever 19 Hydraulic cylinder device 30 Flat cam 35 Hydraulic control valve 39 Control part 40 Operating mechanism 41 Cam rotation motor 43 Cam position potentiometer 50 Lever position potentiometer 63 buzzer

Continuation of the front page (72) Inventor Chie Mizutani 667 Iyacho, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 F term in Mitsubishi Agricultural Machinery Co., Ltd. (Reference) 2B062 AA03 AB01 BA01 BA26 CA05 CA16 2B304 KA16 LA02 LA09 LB05 LB16 LC04 MA03 MB01 MC13 PA01 QA03 RA27 RB02 RB06

Claims (2)

[Claims] A working unit is supported by a hydraulic actuator so as to be able to move up and down with respect to a traveling body, and the working unit is raised by operating a control lever to a predetermined raising position, and an operation lever is controlled to a predetermined fixed position. A mobile agricultural machine that stops at an arbitrary height position and has a hydraulic control valve that performs control to lower by operating the operation lever to a predetermined lowering position, and that turns on the work machine clutch by operating to the planting position, Detecting means for detecting the operating position of the operating lever; and elevating control of the working unit by the operating lever by detecting that the operating lever is being operated to the fixed position by the detecting means when the engine is started. And a control unit that enables the on / off control of the work machine clutch. When the engine is started, the operation lever is not operated to the fixed position. In this case, a control is performed for forcibly disengaging the work machine clutch and holding the work unit at a position before the start of the engine. 2. The apparatus according to claim 1, further comprising an alarm unit that issues an alarm based on a signal from the detection unit when the operation lever is not operated to the fixed position when the engine is started. Hydraulic control device for mobile farm machine.