JP3371548B2 - Work machine lifting and lowering control device of agricultural work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The rice transplanter or seeder that can be moved up and down
Lever to operate the machineLifting control with the operation ofWhile working
Farming controlled by the signal from the control detector on the machine
The present invention relates to a work machine lifting / lowering control device for an industrial machine. [0002] 2. Description of the Related Art Conventionally, Japanese Patent Laid-Open Publication No.
As shown, the rice transplanter can be mounted on the running body so that it can be moved up and down
Then, the rice transplanter is connected by the ground pressure sensor of this rice transplanter.
As well as automatically controlling the lifting and lowering,
Devices that perform condition control are well known. [0003] SUMMARY OF THE INVENTION The above-mentioned prior art
Then, work machineOf the contact pressure or angle of the side float
In the control of lifting and lowering, the soil quality of the field and
If the sensitivity of the elevation control is not adjusted according to the degree of
Work is not possible, so sensitivity adjustment is absolutely necessary.
become. However, if this sensitivity adjustment means is provided,
Equipped on the machine side Controlled by signal from detector
The lifting control is controlled by the adjustment of the sensitivity adjustment means, and the work machine is operated.
Sensitivity even when the detector is not grounded by raising the lever
Adjustment settings may take effect and slow down
Occurs. This is not only a major detriment due to the sensitivity adjustment means.
Do not become. [0004] SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems.
The following technical measures were taken to resolve the problem. That is,Running
Row car bodyIn oneforLifting and lowering work machine 20PossibleProvided inLifting operation
Work leverRaises and lowers the work machine 20 with the operation of 14.control
Then, the angle of the float 35 provided on the work machine 20 is detected.
The work machine 20 is controlled to move up and down by a signal from the detector 58.
And sensitivity adjustment means for adjusting the sensitivity of the elevation control.
In the working machine lifting / lowering control device of the agricultural working machine provided with 57,
Detector 58 detects that float 35 is not grounded.
The transmission signal from the sensitivity adjusting means 57 is ignored.
The lifting and lowering of the working machine 20Farm work
MachineofWork machineLiftingControl device. [0005] DESCRIPTION OF THE PREFERRED EMBODIMENTS A riding type rice transplanter is shown as an embodiment of the present invention.
The outline of the present invention will be described in detail based on the above. 1 is the power
Frame 2 extending in the front-rear direction.
A front mission case 3 is provided in front of the
Mission−Front wheel which goes to the left and right ends of
The front wheels 5 and 5 are axially mounted via a drive case 4 and
5, 5 are configured to be steerable. Further, the frame
An engine 6 is mounted in the front and rear intermediate portion of the engine 2. Soshi
The rear end of the frame 2 has a rear transmission case 7
From the rear transmission case 7 to the rear wheel transmission.
The rear wheels 9, 9 are mounted via the cases 8, 8. 10
Is a control frame, which is equipped with a control handle 11 above it.
You. Reference numeral 12 denotes a cover for covering the engine 6.
A control seat 13 is disposed in the section. 14 is lifting and lowering of work equipment
And an operation lever for operating the power transmission on the work equipment
Of the clutch and hydraulic device for power transmission on the work machine side
It is a common type lever that can operate switching of the switching valve.
You. Reference numeral 15 denotes a boarding floor. 16 stands on the rear of the vehicle
It is a pillar. Reference numeral 17 denotes a link mechanism, which includes an upper link rod 17a.
The base side of the lower link rod 17b is pivotally connected to the support 16 and
The end side is pivoted by a vertical link 17c equipped with a hitch 18.
ing. 19 is a hydraulic cylinder device, which is a cylinder-body 1
The side 9a is pivotally connected to the frame 2, and the piston 19b and the
Interlockingly connected to the upper link 17a, and with the protrusion of the piston 19b
Rotate the link mechanism 17 upward and turn it downward to retract.
It is configured to work. Reference numeral 20 denotes a rice transplanter as a working machine,
Lock mechanism 17 between the vertical link 17c side and the hitch 18.
-Rolling left and right on the rice transplanter side via the ring shaft 21
It is installed to be free. And this rice planting
The rolling shaft 21 for rotating the machine 20 is connected to the vertical link 1.
7c so as to be rotatable on the metal 22 of the hitch 18
It has been inserted. And, the rolling shaft 21 is described later.
Transmission case 23 which partially shares the frame of the rice transplanting machine side
And the rice transplanter 21 is rolled right and left.
It is configured freely. In addition, the vertical link 17c
On the upper side, stepping that rotates forward and reverse through stays 24
A motor 25 is provided, and the forward / reverse rotation of the motor 25
And a piston rod 26 that moves to the left and right sides
You. Then, the piston rod 26 and the rice transplanter 21
The integral projection frame 27 is linked via a spring 28,
The rice transplanter 21
Is performed. The rice transplanter will be briefly described as follows.
The front side of the dual-purpose transmission case 23 is connected to the rolling shaft 21.
It is fixed and can be freely rolled to the link mechanism.
Have been. Seedling supply stand 29 is located above transmission case 23.
Is mounted so that it can move left and right and left and right.
A planting part transmission case that extends rearward at predetermined intervals to the left and right
A planting device 31 is mounted on the rear side of 30. The planting device 31 is for planting seedlings on the rotating case 32.
The seedling attachment 34 having the claws 33 is configured to be rotated.
The seedling-attached nail 33 separates the seedling from the seedling supply table 29 side.
Planted vertically to separate and hold and transplant to the lower field scene
The trajectory is drawn. 35 is a central leveling float,
36a and 36b are side leveling flows located on the left and right sides, respectively.
And the transmission case 23 and the planting portion transmission case 3
It is arranged at a predetermined lateral distance below 0.
The rear side of these floats 35, 36 is
It is attached to the transmission case 30 side. Immediately
That is, it is fixed to the transmission case 30 and projects laterally.
A cylindrical shaft 38 rotatable around a shaft 37 is provided.
An arm 39 which is directed downward and rearward is fixed to the arm 8 and the arm 3
9 Distortion at ground pressure and send an electrical signal proportional to the pressure
Side mounted via the detector 40 (electrostriction meter)
A pin 41 is provided in the direction of
The part is pivoted so that it can swing up and down. Soshi
The detector 40 is, for example, a potentiometer.
Is also good. The detector 40 is provided at the rear of each of the floats.
Detector 40 for central leveling float provided on each mounting part
a, Detector 40b for left leveling float and right leveling
It is a float detector 40c. Also, the center
The front side of the leveling float 35 is fixed to the transmission case 23.
A projection frame 42 protruding forward is provided via an expansion / contraction link 43.
Attached, left and right side leveling floats 36a, 36b
Is a horizontal frame 44 extending from the protrusion frame 42 to the left and right.
The potentiometers 45a and 45b attached to the
In accordance with the up and down movement of the float via the arm 46 and the arm 47
It is configured to be operated. That is, the front part of the float
So that the potentiometer detects the change in the angle
Has formed. Reference numeral 48 denotes a hydraulic switching valve which is mounted on the projection frame 42.
Operation control of the aforementioned hydraulic cylinder device 19
This valve is an electromagnetic switching valve
Switch based on the command signal from the controller
Configuration. Numeral 49 in the hydraulic circuit diagram
Hydraulic tank, 50 indicates a hydraulic pump, 51 indicates a relief valve
You. Reference numeral 52 denotes a controller,
a, 40b, 40c,
Data processing of each signal is performed to switch the hydraulic switching valve 48.
Control. Data by controller 52
For example, the measurement signal from each detector is
When transmitting a control signal based on the average value on average
Or the measured value of the detector 40a of the central leveling float 35
The other side leveling floats 36a, 36 are used as main signals.
The signals of the b-side detectors 40b and 40c are converted into sub-correction signals.
And appropriate processing such as performing data processing. A data memory is stored in the controller 52.
A circuit is provided to duplicate detection signals at predetermined intervals during operation.
Memorized several times, the data memorized before the present and the current
The point measurement data is averaged and the averaged data is added to the averaged data.
A signal for controlling the switching valve 48 based on the
May be implemented. Also, the detection signal from each detector 40
Omit any of the apparently abnormal measurement signals.
Processing. The controller 52 comprises
It also has a data processing function for controlling
Upon receiving the detection signals from the meters 45a and 46,
The rotation of the stepping motor 25 is controlled.
I have. That is, when the rice transplanter 20 is tilted left and right,
When the plane is substantially horizontal, the leveling float 36 on the left and right sides
There is a difference between the vertical heights of the front sides of a and 36b. This height
Is detected by potentiometers 45a and 45b and the
The signal is transmitted to controller 52. This control
Comparing the magnitude of the signal with the
Detected pressure of the ground pressure detectors 40a, 40b, 40c
While watching the force, check the potentiometers 45a and 45b.
Stepping so that the difference between these detection signals falls within a certain range.
The motor 25 is selectively rotated forward or backward. The detector 40
a is the standard value, and the detector 40b
Or the rice transplanter 20 is moved up and down in the direction in which the detector 40c approaches.
The above-described rolling control is performed while being controlled.
You. As described above, the rice transplanter 20 receives the signal from each detector.
Lifting control and rolling control are automatically performed by signals.
Will be Also, the working lever 20 is controlled by the operation lever 14.
Can be raised and lowered by the operation lever 14.
The descending control is based on the following embodiment. That is, the operation lever 14
Can set the elevation of the rice transplanter 20 at the operation position.
It has a configuration having a position lever function. Concrete
Specifically, a pot for detecting the operating angle of the lifting link 17 is provided.
The detection signal from the sensor 53 and the operation of the operation lever 14
Detection signal from potentiometer 54 for detecting working position
Is sent to the controller 52, and both detectors
The transmission signal value from the potentiometer is compared and calculated.
The above-described operation is performed with reference to the detection signal value side of the operation lever 14.
The switching control of the electromagnetic hydraulic switching valve 48 is configured to be performed.
You. That is, the potentiometer 5 on the operation lever 14 side.
4 and the value detected by potentiometer 53
Is switched to neutral at the time when
Is configured to stop. This operation lever 14
The range of the position mode depends on the operation of the operation lever 14.
All areas, position elevation control is effective at all positions
Then, the operation lever 14 is lifted.
In the descending operation area, a reference point C at which the mode can be changed is set.
Further, when the operation lever 14 passes through the reference point C,
And a position detector 55 for detecting this. Soshi
Then, from this reference point C, the operation lever 14 is operated to lower the rice transplanter.
Side, the position mode, which is the entire operation area
, Which is controlled by the signal of the detector 40 prior to
It is configured to be in the dynamic elevating control mode. Also, the reference point C
When the rice transplanter is on the raising operation side,
This is a configuration on the shock mode side. That is, the operation lever 14 is moved to the rice transplanter raising position.
The entire operation area that is operated to the lower position from
, But detected in the operation area on the lower side than the reference point C
When a signal is sent from the
Works, and when no signal is emitted,
Control mode, position mode and automatic control mode.
Is a mixed mode that coexists. Concrete fruit
Explaining in the embodiment, the float 35 has a grounding detection sensor-4.
0d is provided, and when this sensor -40d is not grounded
In the position mode, the work implement 20 is
It is configured to be operable as needed. And in the paddy field
When the working machine 20 is lowered by the operation lever 14, the reference point C
When the float 35 comes into contact with the topsoil surface after
0d detects this, and the automatic control mode side
The lift control is performed in the dynamic control mode.
You. The reference point C is configured to be freely changeable,
The mode switching position can be set according to the depth of the field.
It is configured so that: In the control mode of the above embodiment, the position
Extension position operation during operation of the operation lever of the mode
Set the opening as follows: That is, the working machine 20 is set at the highest point.
When it rises to P, the detected value of the potentiometer 53 becomes
By exceeding a certain value, the work machine 20 is positioned at the highest position.
Can be detected, and this detection allows the initial setting mode to be expanded.
Reset. Initial position after this reset
The mode is written to the controller 52 as a non-volatile memory.
It's in. The detection of the potentiometer 53
Instead, a higher-order point detection sensor is provided.
May be transmitted to the controller 52. This early
The setting mode is expanded from the lowest point M of the work machine 20 to the highest.
The height H, which is the entire elevating area up to the point P, is adjusted by the operation lever-1.
4 divided by the total operation area size L. This first
Work machine 20 switches to automatic mode in response to
After that, the operation lever 14 is moved from the operation area of the reference point C to the
After automatic elevation control by the detector on the lower side
When the work machine 20 is to be lifted during the
- That is, the operation lever 14 is operated to the reference point C.
When the working machine 20 is moved from the height position N of the working machine 20
The height K up to the highest point P is set for all operation areas of the operation lever 14.
It is set to the development divided by the area size L. This means that the work under automatic control is performed.
Operation lever 14 is moved upward from reference point C
When the operation lever 14 is deployed
You can choose a rapid climb speed with sparseness, and conversely,
When lowering the work machine 20 from the
The opening size becomes dense and a slower descent speed can be selected.
It has become. The operation of the above configuration will be described. Before work
At the time of inspection outside the field, the working machine 20 is operated by the operating lever.
14, the lowest point M of the working machine 20
From the height of the highest point P
Can be selected, for example, the operation lever 14 is lower than the reference point C.
Work machine 20 is set at an arbitrary height position even in the side operation area
Can be stopped. Then, the work machine 20 is moved downward from the highest point P side.
When lowering, the position mode is reset to the initial side.
The lifting and lowering operation can be performed in a dense deployment mode.
That is, the total height H of the working machine 20 and the total operation of the operation lever 14
Operation can be performed with the feeling of an operation lever that is proportional to the area size L.
You. Next, during the rice transplanting operation, the operation lever is operated.
When the rice transplanter 20 is operated to descend on 14, the
In the operation position on the ascending side from above, the lever
The rice transplanter 20 is lifted and lowered at the 14 operation positions to
The operation lever 14 can be temporarily stopped.
When the lower operation is performed from the reference point C, the mode switches to the mix mode.
Changeover, and the automatic mode has priority.
The rice transplanter side by the detectors 40a, 40b, 40c.
Elevation control based on the ground pressure detection signal. Immediately
That is, the measured value from each detector 40 is performed by the controller 52.
Command signal for switching the electromagnetic switching valve 48
Sent from the controller 52, the switching valve 48 is switched
The rice transplanter 20 is controlled to move up and down. That is, the ground pressure
Generally, when the pressure becomes higher than a predetermined range pressure, the rice transplanter 20 is raised.
A signal is issued to ascend, and conversely, a descending signal when low
Will be issued. Next, when turning at the end of the field,
When the operation lever 14 is moved upward from the reference point C,
Dynamically switches to the second position mode and descends
It is in the ascending operation position mode which is faster than the time operation.
The working machine 20 can be lifted. And what
The work machine 20 can also be stopped at the position. Also,
At this time, the work machine 20 is not raised to the highest point P.
In this case, the mode switching reset is not performed.
Fast lifting operation becomes possible. Therefore, veteran work
If the contractor turns and re-work, this
It only needs to be operated in the position mode where the descending operation is possible.
In the case of unfamiliar workers such as women and elderly people,
Operate to reset, slow down operation mode
It is a good idea to turn around with In addition, planting at the reference point C position
The clutch should be at least in the "disengaged" position.
Needless to say. Also, during the operation, the rice transplanter 20 may be tilted left and right.
The height due to this inclination is changed to the left and right side floats.
A potentiometer for detecting the vertical fluctuation of the front position of 36a, 36b
Detected by the siometers 45a and 45b, the controller
52, and is calculated by the controller 52 to calculate the inclination.
A correction command signal is issued, and the stepping motor 25 operates.
The rice transplanter 20 is tilted left and right through the electric cylinder 26.
Will be corrected. Next, a related embodiment will be described.
Elevating operation of the work machine 20 in the position mode described above.
In the work, when raising and lowering the work machine 20,
The operation is matched to the movement of lever 14, and during operation,
Work machine 20 at the start of the turn
After lifting and turning, lower the work machine 20 again.
When continuing the work, this lifting operation in position mode
Then, following the operation of the operation lever 14
20 operations are performed. That is, the operation lever 14 is always operated.
Potentiometer 54 for measuring working angle and lifting link angle
Compare the detected value with the potentiometer 53 that measures the degree
The lifting and lowering of the work equipment 20 is performed while confirming that
Which makes it extremely slow
Things happen. In particular, work to improve work efficiency
After turning from the rising state of the industrial machine, it is necessary to lower as fast as possible
In addition to the inefficiency, the traveling body 1 is moving forward.
Therefore, there is a disadvantage that the remaining work is widened. Accordingly
Therefore, in such a case, the operation
The operating lever is slightly moved to the lower side.
8 switches immediately and configures it to last
It becomes important. The embodiment shown in FIG. 5 is an embodiment of the present invention.
This is an example, and the position mode is released to the operation lever 14 itself.
The switch SW1 to be turned off is attached. This switch
Switch SW1 to "ON" and send a signal to the controller 52.
Then, the relay R is excited to open its contact R1,
The circuit on the side of the tensiometer 53 is "cut off". But
Therefore, the position mode is interrupted and the operation lever 14
The operating angle signal is used as is for the solenoid switching signal of the switching valve 48.
No. and switch. That is, the switch SW1
Is set to “On” and the operation lever 14 is set to the “up” side.
If it can be moved, a raising signal is issued immediately and the switching valve 48
It is immediately switched to the up side, and conversely, if you can move it down,
The lowering signal is issued immediately and the switching valve 48 is immediately lowered.
Is configured to be switched to. Like this switch
The work machine 20 is switched to the instant elevating operation mode.
It has a configuration. The switch SW1 of the above embodiment is provided with a lever.
-14 is provided as a knock switch button on the tip side.
Press once with your thumb while holding bar 14 to turn it on.
Alternate switching type that jumps out when you press the next
Switch is convenient. The embodiment shown in FIG.
When setting the operation lever rotation area of the
It shows the means of the combination and is in advance in the controller 52
Memory as a temporary memory, the upper and lower limits of the operation lever 14
The limit position mode area is set. That is, the analog sensor is automatically adjusted.
Write the set reference value of adjustment to the non-volatile memory
A sensor set mode is provided, and during this mode,
An appropriate analog sensor can be used to set the upper and lower
It is configured to write a quasi-value. Explain this specifically
And position control of the work machine 20 with the operation lever 14.
The limit value of the potentiometer that can be
−14, the section between the upper limit point X and the lower limit point Y (potential
Within the functional area of the camera)
Must be set. This is the operation lever-14
Due to limitations of operation guides and ease of operation.
It can be set at the time of loading, machine inspection and after repair.
Required. In the embodiment, the set area (used area) is used.
Memory area) in the range from point a to point b.
First, the working machine 20 is substantially raised by the operation lever 14.
After ascending to the limit point, the mode change switch S
Operating lever without operating W1 to lower work machine 2
After operating 14 to point a, write position mode set
Send a start signal to the controller with switch SW2
I do. Next, the operating lever 14 is temporarily moved to the lowest position.
Operate the switch S so as not to raise this work machine.
Operate W1 and operate lever 14 to b position
Then, the final position mode setting switch SW3
Is turned on to the controller 52 for setting the position mode.
Write the reference non-volatile memory. This writing,
It usually completes in a few seconds and the display is displayed on the display 56 as appropriate.
You. During the position mode set in this way,
Is the reference point C and the clutch
Includes a point e that becomes “in”. And, similarly,
The points C and e, which are the reference positions, are switched by the same method.
Setting by providing switches SW4 and SW5
Can be. As described above, the position mode area is set.
Control point that can be used as a reference or reference point
It is possible to set up the shipping inspection after production and the mode setting after repair.
It can be done easily. The switch SW1 and switch
The switch SW2 can be shared with the switch SW2.
Even if the controller 2 is not turned on, the controller 52
The operation lever 14 when the switch SW1 is operated is set to the point a.
Use the software as the start signal at the point of operation
This can be omitted if necessary. As shown in FIG.According to the present inventionThe example is an operation
Elevation operation area in position mode by lever 14
Automatic control that performs automatic lifting and lowering control based on the area and the signal from the detector
The lifting and lowering control means divided into the operation area of the control mode
In other words, the sensitivity adjusting means 57 for adjusting the speed of the lifting control
In particular, the work implement 20 is raised by detecting the ground pressure.
In the case of a rice transplanter or seeder that is controlled down, the sensitivity adjustment means
It is absolutely necessary. It depends on the soil quality of the field and the surface of the paddy field.
If you do not adjust the degree of hardness, you can work with high accuracy
Not for any reason. However, this sensitivity adjustment means is provided.
And the ground pressure detector 40 provided on the float 35 side,H
Angle of rotor 35Taking a potentiometer for detection as an example
The lifting control controlled by the signal from the detector 58
The work machine 20 is controlled by the dial adjustment of the degree adjusting means 57.
Is raised by the operation lever 14 so that the float 35 does not touch the ground.
This sensitivity adjustment setting remains effective even in the
The situation where the degree becomes dull occurs. This is because the sensitivity adjusting means 57
Is a major evil. Then, the detector 40 or the detector58But
Float 35AirFloating state (non-grounding state)
If the signal is transmitted, the transmission signal from the sensitivity adjusting means 57 is output.
Is configured to control the processing by
You. That is, for example, the float is indicated by a virtual line in FIG.
When it is in a state and no longer receives the ground pressure, the potentiometer
The controller 58 sends a lower limit signal to the controller 52.
However, when this signal value exceeds a certain standard,
The operation to ignore the signal from the sensitivity adjustment means 57
Performed in the controller 52 and unaffected by sensitivity adjustment
Control will be executed. This allows the sensitivity system
The adverse effect caused by the control is eliminated, and the float 35 etc.
Sensitivity adjustment is performed only when grounding and automatic control are performed.
Clause control will be performed. In the case of the above-described embodiment, the mode switching group
There is a reference point C and a point e where the planting clutch is turned on.
When the point C or the point e is detected, the area on the rising side is set higher than this.
In which the signal by the sensitivity adjusting means 57 is ignored.
There is no harm in using technology to replace it. In this case
Is raised and lowered by sensitivity adjustment on the upper operation side from these points
It becomes possible to solve the problem of insensitivity of control. In the above-described embodiment, the sensitivity adjustment control is turned off.
The mitting technique has been described, but the working machine 20
It may work at a slow speed when lowering from the suspended
The most troublesome point is that the business performance does not improve. So, this
In order to solve the problem, the detector 40 or the detector
58Float 35AirWhen it comes to a floating state, for example,
Potentiometer 58 controls the lower limit signal.
And sends it to the
In this case, a signal value is obtained.
As with the technical means, the signal from the potentiometer 53 is
Energize relay R to open contact and open contact R
With this configuration, the working machine in which the float 35 is suspended in the air
When the operating lever 14 is moved downward from the 20 ascending position
When the position control is released, the work machine 20
Can be lowered. In addition, this float hanging form
Instead of detecting the state of the state, the mode switching reference point C and the plant
The same applies when the point e at which the clutch with
The operating lever 14 is moved downward from the position where the work machine 20 is raised.
If you do, the position control will be released and
It is also possible to lower the industrial machine 20. FIG. 8 solves the problem at the time of rolling control.
The detectors 45a, 45b
From the stepping mode for rolling control
The work machine is rotated by the electric cylinder
In the configuration in which the automatic rolling control is performed on the
-Rolls that can be manually operated from the steering position
Switch SW6 for rolling and rolling left
The rolling during this automatic control
If manual rolling switching on the opposite side to the control direction is performed
If an excessive current flows through the control circuit,
The control unit may be damaged or erroneous control may be performed. This
To solve such problems as shown in the figure,
Switch SW6 to the left and right rolling sides.
That is, this manual signal is transmitted to the controller 52.
When automatic control is interrupted for a certain period of time,
The rolling by a signal is configured to be performed. This
Then, the above problem can be solved. [0033] According to the present invention,Float 35
When the detector 58 detects that the grounding is not performed,
The work machine 20 ignores the transmission signal from the sensitivity adjusting means 57.
Is controlled to move up and down, so that
The adverse effect of the sensitivity control in raising and lowering the work machine 20
Disappears, and float 35 etc. are grounded and automatic control
That the sensitivity adjustment control is performed only when
The lifting speed of the work equipment 20 becomes slower.
Can avoid.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view. FIG. 2 is a front sectional view of a main part. FIG. 3 is a control circuit diagram. FIG. 4 is an operation explanatory view including a main part control circuit. FIG. FIG. 6 is a control circuit diagram of a main part of another example. FIG. 7 is a control circuit diagram of a main part showing an embodiment of the present invention . FIG. 8 shows technical means relating to rolling control. Control circuit diagram of main parts [Explanation of reference numerals] 1 Traveling vehicle body 14 Elevating operation lever 20 Work implement 35 Float 57 Sensitivity adjusting means 58 Detector

Claims (1)

(57) lifting Allowed the working machine 20 for the Patent Claims 1. A vehicle body 1
The work machine 20 is controlled to move up and down in accordance with the operation of the lifting operation lever 14, and a float 35 provided on the work machine 20 side is provided.
Work equipment 2 based on a signal from a detector 58 for detecting the angle of
0 and the sensitivity of the elevation control is adjusted.
Work machine lifting / lowering control of agricultural work machine having sensitivity adjusting means 57
In the apparatus, a state where the float 35 is not grounded is detected by a detector.
In the case where 58 is detected,
It is characterized in that the work machine 20 is lifted and lowered while ignoring the transmission signal.
The work equipment elevation control device of the agricultural work equipment to be used.