JP2989160B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work apparatus in which a working device is connected to a traveling machine body by a drive mechanism so as to be able to move up and down freely, and the working device can be switched between an on state for driving the working apparatus and an off state for stopping the working apparatus. The present invention relates to a work vehicle having a clutch and a control device for outputting an operation command to the drive mechanism and an operation mechanism of a work clutch, and more particularly to a technique for easily performing various operations required at the time of headland turning and the like.

[0002]

2. Description of the Related Art In a conventional working vehicle, an elevating operation tool for elevating and lowering a working device is configured as a lever type, and an operation position setting result obtained by artificially swinging the elevating operation tool is described. Thus, the lifting and lowering control of the working device and the on / off control of the working clutch can be performed (see, for example, JP-A-3-147709 and JP-A-3-285605). In other words, this operation lever has an operation area for raising and lowering the working device in a state where the work clutch is disengaged and stopping at an arbitrary position, and a lowering operation for performing automatic elevating control when the work clutch is disengaged. The operation area is divided into the operation area of the operation lever, and the operation position associated with the swing of the operation lever. Each control is performed by the change of.

[0003]

As the above-mentioned conventional work vehicle, a rice planting operation in a rice transplanter, which is an example of a work vehicle that involves raising and lowering a working device and turning on and off a work clutch, will be described as an example. The basic form of work is reciprocating planting, in which the plant is reciprocated while traveling in the field.Every time the planting run in one stroke is completed and the ridge is reached, the headland turns and the aircraft turns in the opposite direction. The process shifts to the planting run of the next step adjacent to the planting shoots of the step. In this headland turning around the ridge, the seedling planting operation in the seedling planting device is stopped, the seedling planting device is raised from the mud surface, and the steering handle is operated to make the body turn, and the previous planting shoots and Aircraft control that corrects the orientation of the aircraft while adjusting the distance (strip) of the aircraft, that is, performing so-called alignment, lowering the planting work device at an appropriate time before the completion of the alignment, and further ending the alignment Accordingly, the work clutch is engaged and operated so that planting is resumed with the seedlings aligned with the end position of the previous planting shoots. In this case, if the operation of the steering handle is delayed, the steering wheel becomes large and it takes time to perform the subsequent alignment. Therefore, it is desired that the operation of the steering handle be performed as quickly as possible. It is absolutely necessary to release the hand from the steering wheel and operate the elevating operation lever. During this time, the operation of the steering wheel is inevitably delayed. In addition, if the operator is unskilled, there is a need to reduce the traveling speed of the body before turning, and this is an operation that is difficult for unskilled operators to perform. If it is only considered to improve the complexity of the operation during such turning operation, for example, the raising and lowering operation of the seedling planting device is performed by a switchable switch, and in conjunction with the raising operation of this switch It is inconceivable to cooperate to automatically turn on and off the planting clutch. However, such a simple interlocking structure has the following problems. In other words, when lowering the seedling planting apparatus, if the lowering operation of the seedling planting apparatus and the operation of engaging the planting clutch are always performed at the same timing, the time when the seedling planting apparatus comes into contact with the ground depending on the depth of the field is increased. Therefore, it is impossible to adjust whether the work clutch is engaged or before or after the work clutch is engaged, and the work clutch cannot be engaged and operated at an appropriate operation timing. For this reason, it is necessary to separately provide an operating tool dedicated to the operation of engaging the clutch, and it is unavoidable to complicate the structure and to eliminate the complexity of the operation.

The present invention focuses on raising and lowering the seedling planting apparatus by operating a lifting operation tool, and eliminates troublesome operation during headland turning. It is an object of the present invention to easily perform an operation for switching to a desired state.

[0005]

In order to achieve the above object, the technical means of the present invention is that a working device is connected to a traveling machine body by a drive mechanism so as to be able to move up and down, and the working device is driven. And a work clutch that can be switched between an open state and a stop state where the work device is stopped, and a control device that outputs an operation command to the drive mechanism and the operation mechanism of the work clutch. A first operating means for outputting an operation command to the drive mechanism so as to raise and lower the device to an arbitrary height, and a rising command to a preset height and a descending command from the set height. The operation clutch is switched from the engaged state to the disengaged state with the forcible raising of the working device in response to the lifting command of the second operating means. The operation of the operation mechanism and the operation of the drive mechanism are configured so as to be associated with the second operation means so that the operation device is operated to descend while maintaining the disengagement state of the work clutch in the descending command. Yes, and
The control of the work clutch by the control device is performed by a second operation when the work device is switched to a state in which the work device is lowered to the ground.
On the basis of the determination result of the operation mode of the operation means, it is configured to be switched between a state in which the work clutch is engaged and a state in which the engagement operation is restrained.
The effects are as follows.

[Operation] According to the above feature, the lifting / lowering operation during non-working outside the field or the lifting / lowering of the working device to an arbitrary height during maintenance can be freely performed by the operation of the first operating means.
In addition, a series of operations that are required to be performed promptly during turning or the like during field work, that is, when the working device is raised to a set height and the work clutch is disengaged, and when the working device is lowered on the ground. The engagement of the work clutch or the check of the engagement of the engagement operation can be selected by the second operating means. Therefore, the lifting and lowering of the working device and the switching operation of the engagement and disengagement of the planting clutch are performed by different operating tools. As compared with the operation performed by the user, the trouble of changing the operation tool is eliminated and the operation is simplified. The control for selecting the engagement of the work clutch or the check of the engagement operation when the working device is lowered in contact with the ground is performed by determining the operation mode of the second operating means when the working device is lowered in contact with the ground. Therefore, there is no need to specially provide a switching lever or the like.

[Effects of the Invention] According to the above-mentioned characteristic configuration of the present invention, the operator can perform various operations necessary for turning, that is, the raising / lowering operation of the lifting / lowering device and the on / off selection of the work clutch by operating with one operating tool. Therefore, it is possible to concentrate on the turning operation with the steering wheel, avoiding the complexity of operation such as switching multiple operation tools and selecting the operation direction of each operation tool, accurate vision operation based on vision, It is easy to perform the operations required for the work easily with ample time. Further, the control for selecting the engagement of the work clutch when the working device is lowered from the ascending position or the check of the on-operation is performed by determining the operation mode of the second operating means when the working device is lowered to the ground. Therefore, there is an advantage that an increase in the number of parts such as separately providing a switching lever can be avoided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a riding rice transplanter as a working vehicle. This rice transplanter is constructed by connecting a seedling planting device 2 (an example of a working device) to a rear part of a riding type traveling machine so as to be able to ascend and descend via a parallel quadruple link mechanism 1 and to freely roll left and right around a longitudinal axis. is there. The seedling planting device 2 is supported by a planting transmission case 4 that also serves as a frame so as to be rotatable around a longitudinal axis Y.
In the planting transmission case 4, a seedling rest 5 that reciprocates sideways with a constant stroke, a plurality of planting mechanisms 6 that take out seedlings for planting one by one from the lower end of the seedling rest 5 and plant the seedlings in a field.
It is provided with three ground floats 7 and the like arranged in parallel on the left and right sides, and is configured to move up and down by the expansion and contraction drive of the hydraulic cylinder 10.

As shown in FIG. 1, a hydraulic control valve V for the hydraulic cylinder 10 is of an electromagnetic type, and the electromagnetic control valve V is configured to be driven and controlled by a control device 13 having a microcomputer. It is. That is, the lifting lever 1 provided on the side of the driver's seat 15 of the aircraft
6 (an example of a first operation means), the output of the potentiometer PM1 based on the swing operation is constructed so that an ascending operation, a descending operation and a neutral stop state can be artificially exhibited, and a push operation provided on the control panel 17 Type lifting switch SW1
An example of the second operation means is configured to allow the ascending operation and the descending operation to appear alternately.

In the planting operation state, the elevation control means A for maintaining the height of the seedling plant 2 above the ground at a predetermined value is controlled by the control device 1.
3 is provided in the form of a control program. That is, the grounding float 7 at the center of the fuselage is supported so as to be able to swing up and down around the rear fulcrum, and relative to the grounding float on the front side of the grounding float 7 due to the change of the ground height of the seedling planting device 2. Vertical movement is detected by potentiometer PM2,
The controller 13 controls the electromagnetic control valve V of the hydraulic cylinder 10 so that the output value of the potentiometer PM2 falls within a predetermined setting area, and maintains the seedling planting apparatus 2 at a predetermined ground height. When the raising and lowering switch SW1 is actuated to move the seedling planting apparatus 2 up to the maximum ascending position, the limit switch SW2 for detecting that the seedling planting apparatus 2 has risen to near the maximum ascending position is moved to the traveling machine body. Is mounted on the rear wheel fender portion 21, and a middle portion of the link mechanism 1 is brought into contact with the ascending operation to perform a detecting operation,
The ascending-side drive of the hydraulic cylinder 10 is automatically stopped based on the detection operation of the limit switch SW2.

[0011] The power from the traveling machine body is applied to the planting clutch 21.
An example of a working clutch is configured to be intermittently supplied to the seedling planting device 2 via a transmission shaft 22, and the planting clutch 21 is configured to be turned on and off by an electric motor M with a speed reduction mechanism. On both the left and right sides of the seedling planting device 2, line drawing markers 23R and 23L that can be switched between an action posture for projecting laterally outward to draw a travel target line in an unplanted area and a storage posture for retreating to the inside of the machine are provided. As shown in FIG. 2, the drawing markers 23R and 23L are oscillated and biased by a spring 24 toward the action posture, and the relative positions of the rear link 1a are changed when the seedling planting device 2 is raised. Accordingly, the operation wire 26 is pulled by the roller 25 so as to be in a retired posture. Lock mechanisms 27R and 27L are provided for automatically retaining and holding the posture in the retired posture, respectively.
When the seedling planting apparatus 2 is lowered in a state where the lock holding of the R and 27L is selectively released, the drawing marker on the selected side is set to the action posture. Electromagnetic solenoids 28R, 28L are provided for sequentially releasing the lock mechanisms 27R, 27L alternately left and right.

The raising / lowering operation switch SW1 can control the raising / lowering of the seedling planting apparatus 2, the control of the planting clutch 21, and the control of the left and right drawing markers 23R and 23L. That is, the first operation mode determining means B for determining the operation mode of the raising / lowering operation switch SW1 at the time of raising the seedling planting apparatus 2 is provided. As the device 2 is raised, the lock mechanism 27R, 27L is switched between a state in which the lock state is sequentially switched left and right and a state in which the operation is restrained. In addition, the lifting operation switch S
A second operation form discriminating means C for discriminating an operation form at the time of a descending operation of the seedling planting apparatus 2 of W1 is provided. Accordingly, the state can be switched between a state in which the planting clutch 21 is automatically engaged and a state in which the automatic clutch engaging operation is restrained. The operation mode discriminating means B and C are provided in the control device 13 in the form of a control program, and the control device 13 performs control as follows.

FIGS. 4 and 5 show control flowcharts in the planting operation. When the raising / lowering operation switch SW1 is operated in a state where the raising / lowering lever 16 is operated to the lowering position of the seedling planting device 2, the electric motor M is driven to drive the planting clutch 2
In addition to turning off the switch 1, the operation of raising the seedling planting device 2 to the maximum raising position is performed while driving the electromagnetic control valve V to determine the detection state of the limit switch SW2 (steps 1 to 4). Operation time t for raising the lifting operation switch SW1
When 1 is equal to or longer than the predetermined time T1, the electromagnetic solenoids 28R and 28L are switched to operate the drawing marker 23.
R and 23L are switched left and right (steps 5 and 6).
When the operation time t1 is short, the electromagnetic solenoid S
L is not driven, and the left and right switching of the drawing markers 23R and 23L is suppressed. When the up / down operation switch SW1 is operated again, the electromagnetic control valve V is driven to lower the planting apparatus 2 on the ground, and the up / down operation switch S1 is operated.
When the descending operation time t2 of W1 is longer than the predetermined set time T2, the electric motor M is driven to drive the planting clutch when the predetermined set time T3 has elapsed from the point of contact detected from the change in the output of the potentiometer PM2. 21 is automatically turned on (steps 7 to 12). When the lowering operation time t2 is short, the seedling planting device 2 is lowered to the ground, and the planting clutch 21 is maintained in the disengaged state. When the planting clutch 21 is engaged, the planting status indicator lamp 44 provided on the control panel 17 is lit in blue, and when the planting clutch 21 is in the disengaged state, it is lit in red (step). 13, 15). Further, a marker lamp 45 provided on the control panel 17 is displayed to indicate which side of the drawing markers 23R, 23L in the active state is on the left or right (step 14).

[Another Embodiment] The lifting operation switch SW1 may be constituted by a swing operation type in place of the push operation type. The determination may be made based on the difference in the direction.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a control block diagram.

FIG. 2 is a front view of a drawing marker support unit.

FIG. 3 is an overall side view of the rice transplanter.

FIG. 4 is a control flowchart.

FIG. 5 is a control flowchart.

[Explanation of symbols]

 2 Working device 10 Drive mechanism 13 Control device 16 First operating means 21 Working clutch M Operating mechanism SW1 Second operating means

Claims (1)

(57) [Claims] A driving mechanism (10) for a traveling body.
The working device (2) is connected so that it can move up and down freely.
(2) Stop the working state and the working device (2) to drive
Equipped with a work clutch (21) that can be switched to the off state.
And the drive mechanism (10) and the work clutch
A control device for outputting an operation command to the operation mechanism (M) of (21).
A work vehicle provided with a mounting device (13) , wherein the control device (13) is provided with a working device (2) at an arbitrary height.
To the drive mechanism (10) so that
First operation means (16) for outputting an operation command, and preset
Command to the set height and descend from the set height
Second operation for outputting a command to the drive mechanism (10)
(SW1) and a working device in response to a command to raise the second operating means (SW1).
With the forced ascent in (2), the work clutch (21)
It is switched from the on state to the off state, and the down command
Then, the disengaged state of the work clutch (21) is maintained while
Of the operating mechanism (M) so that the position (2) moves downward.
The operation and the operation of the drive mechanism (10) are performed by the second operating hand.
And the working clutch (2) by the control device (13).
The control of 1) is to lower the working device (2) on the ground.
Of the second operating means (SW1) at the time of the switching operation to the state
Based on the result of the operation mode determination, the work clutch (2
1) The state of entering operation and the state of checking the entering operation
A work vehicle configured to be switched to