JP2002281805A - Controller for lifting and lowering of implement of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the most lowering position of an implement by simple operation in a working vehicle for lifting and lowering the implement by operation of a position lever. SOLUTION: This controller for lifting and lowering of the implement of the working vehicle is obtained by installing a most lowering regulating dial 60 at a position adjacent to a position lever 54 for performing operation to change the height of the implement and regulating the most lowering position of the implement with a most lowering regulating dial 60. The operation to set the most lowering regulating dial 60 is preferentially carried out to the lowering operation of the position lever 54. The implement is stopped at the height set with the most lowering regulating dial 60 and is not rotated to the height or below when the implement is lowered with the position lever 54 even if the operation to lower the position lever 54 is continued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine lift control device for a work vehicle, and more particularly to a work machine lift control device for electrically restricting the lowest position of a work machine.

[0002]

2. Description of the Related Art
A work machine is connected to the body of the work vehicle via a link mechanism,
There is known an apparatus in which a lift arm is rotated by driving an actuator to move a work machine up and down. This type of work vehicle has a position lever near the driver's seat,
The height of the working machine is changed by driving the actuator by operating the position lever. Also, when working while raising and lowering the work implement by operating the position lever, to prevent the work implement from going deep into the soil,
There is also known one provided with a means for regulating the lowermost position of the work machine.

Conventionally, the lowering of the working machine is restricted by restricting the operation of the position lever in the lowering direction by a stopper piece or the like, and by directly locking the lowering operation of the link mechanism by the stopper piece or the like. However, each time the operator has to manually set the stopper pieces, the operability is not good. In addition, there is a danger that the operator may pinch a finger while setting the stopper pieces.

Therefore, in a working vehicle in which the working machine is raised and lowered by operating the position lever, there arises a technical problem to be solved in order to regulate the lowest position of the working machine by a simple operation. An object of the present invention is to solve this problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and a work machine 14 connected to a vehicle body is moved up and down by the rotation of a lift arm 19. In the work vehicle 10 having the position lever 54 for changing the height of the work arm, a lowering limit setting device 60 for restricting the lowering position of the lift arm 19 is provided near the operating position of the position lever 54 on the lower side of the work equipment. A work machine lifting / lowering control device for the work vehicle provided, and a position lever 54 for operating the work machine 14 connected to the vehicle body up and down by rotating the lift arm 19 and changing the height of the work machine 14 are provided. In the work vehicle 10, a lowering restriction setting device 60 for restricting the lowering position of the work implement by the position lever 54 is provided. The lowering restriction setting device than the position 60
When the restriction position is changed to the raising side, the work machine lifting / lowering control device of the work vehicle provided with the control means 50 for driving the lift arm 19 prior to the set value of the position lever 54, and the work vehicle 10 Is provided with a switch-type working machine elevating / lowering operating means 52 different from the position lever 54.
An object of the present invention is to provide a work machine lifting / lowering control device for a work vehicle including a control means 50 for continuously raising or lowering the lift arm 19 from a raised position to a lowered position.

[0006]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a tractor 10 as an example of a work vehicle.
1 is mounted and covered with a hood 12, and a rotary working machine 14 is connected to a rear portion of the body via a link mechanism 13. The link mechanism 13 includes a top link 15 and left and right lower links 16, 16. The link mechanism 13 drives a lift cylinder 18 provided on an upper portion of the transmission case 17 to rotate the lift arms 19, 19, thereby causing the left and right lift rods to move. The lower links 16, 16 move up and down via 20, 20, respectively. Thus, the rotary working machine 14 moves up and down around the tip of the lower links 16 and 16 as the center of rotation.

A lift arm angle sensor 21 is provided at the rotation base of the lift arm 19 as means for detecting the elevation of the work machine. The lift arm angle sensor 21 detects the rotation angle of the lift arm 19. Is detected, and the elevation of the rotary working machine 14 is calculated by the controller 50 described later. The main cover 22 of the rotary working machine 14
The rear cover 23 is attached to the rear end of the
The rotation angle of the rear cover 23 is detected by a rear cover sensor 24, and the rotary work machine 14 is
Calculate the amount of tillage.

FIG. 2 shows a power transmission path, and FIG. 3 is a block diagram of a control system. In FIGS. 1 to 3, the power of the engine 11 is transmitted through the main clutch 30 to the transmission case 1.
7, the forward / reverse switching device 31 of the traveling system and the PTO
It is input to the PTO clutch 32 of the system. The traveling system power is transmitted from the forward / reverse switching device 31 to the main transmission device 33 and the auxiliary transmission device 3.
4 is transmitted. By pressing a button provided on the shift lever 26, the shift cylinder 2 serving as an actuator is pressed.
7 and 28 are driven to switch the main transmission 33, and the manual operation of the shift lever 26 moves the shifter to switch the subtransmission 34.

The main transmission 33 and the auxiliary transmission 3
The traveling system power decelerated in a plurality of stages at 4 is transmitted from the rear differential device 35 to the left and right output shafts 36, 36, and further transmitted to the rear wheels 38 after being further decelerated by the reduction mechanism 37. A brake device 40 is attached to the outer end of the output shaft 36, and the brake plate of the brake device 40 is pressed by driving the brake cylinder 41, so that the rotation of the left and right output shafts 36, 36 is separately performed. It is formed so that it can be braked.

On the other hand, the power branched forward from the auxiliary transmission 34 is transmitted to the left and right output shafts 45, 45 from a front differential 44 via a four-wheel drive switching device 43.
, The front wheel 46 is driven at a constant speed or a double speed with respect to the peripheral speed of the rear wheel 38. In addition, a steering handle 48, which is a steering operation unit of the fuselage, is provided in front of the driver's seat 47. The rotation operation of the steering handle 48 is transmitted to a steering device 49, and the front wheels 46 are turned in accordance with the rotation operation of the steering handle 48. Turn left and right. The steering operation amount of the front wheel 46 is detected by a front wheel turning angle sensor 51.

Further, in the vicinity of the steering handle 48, a work implement elevating lever 52 is provided as a switch-type work implement elevating operation means different from a position lever 54 to be described later, and the forward / reverse switching device 31 is moved forward or backward. A forward / reverse switching lever 53 for switching is provided. By operating the work machine lifting lever 52, the rotary work machine 14 is continuously raised from the work position to a predetermined height, or the rotary work machine 14 is continuously lowered from the predetermined height to the work position. Driver's seat 4
7, the speed change lever 26 and the position lever 5
The height of the rotary working machine 14 is changed by the position lever 54.

As shown in FIG. 4, various levers such as the speed change lever 26 and the position lever 54, a cultivation depth adjustment dial 55 and a PTO
Various dials and switches, such as an on / off switch 56, are provided. Also, the highest position adjustment dial 57
Infrequently used dials, such as the left and right tilt adjustment dial 58 and the like, are provided at positions covered by the cover 59.
The raising position adjusting dial 57 is a raising position setting device that sets the raising position of the lift arm 19 (that is, the raising position of the rotary work machine 14).
By turning the dial 7 clockwise, the highest position can be set high, and by turning the maximum position adjustment dial 57 counterclockwise, the highest position can be set low. Then, the controller 50 is controlled according to the set position of the highest position adjustment dial 57.
Monitors the detection signal of the lift arm angle sensor 21 and regulates the output signal to the ascending solenoid 61 so as not to rotate the lift arm 19 beyond a predetermined height.

At this time, at a position near the position lever 54 and on the lower side of the work implement of the lever guide, a lowering restriction setting device for restricting the lowering position of the lift arm 19 (that is, the lowering position of the rotary operating machine 14). The lowering restriction dial 60 is provided. The lower limit regulation dial 60
Is a rotary working machine 1 using the position lever 54.
4, the lowermost position can be set higher by turning the lowermost restricting dial 60 clockwise, and the lowermost position can be set by turning the lowermost restricting dial 60 counterclockwise. Can be set lower. Then, in accordance with the set position of the lowermost restriction dial 60, the controller 5
While 0 monitors the detection signal of the lift arm angle sensor 21, the output signal to the descending solenoid 62 is regulated so that the lift arm 19 does not rotate below a predetermined height.

Here, the setting operation of the lowest lowering restriction dial 60 is given priority over the lowering operation of the position lever 54. For example, as shown in FIG. 5, when the lowermost position (the position shown by a two-dot chain line) is set in advance by the lowering restriction dial 60, the uppermost position (shown by a solid line) where the lift arm 19 can rotate. Position),
When the lowering operation of the position lever 54 is performed, the lift arm 19 is rotated downward and the work machine is lowered, but the rotation of the lift arm 19 is stopped at the set lowest position. Then, even if the lowering operation of the position lever 54 is continued, the lift arm 19 does not rotate below its height.

As described above, since the controller 50 electrically controls the output signal to the descending solenoid 62, the structure is simplified, the cost is reduced, and the lowermost position can be set accurately and the operability is improved. It will be good. In addition, since the setting operation of the lowering restriction dial 60 is given priority over the lowering operation of the position lever 54,
In a state where the lift arm 19 is at the (lowest) position set as described above, the operator operates the lowering restriction dial 6.
0, the controller 5 is operated according to the rotation operation.
Ascending solenoid 61 or descending solenoid 62 from 0
, And the lift arm 19 moves up and down. That is, when the position lever 54 is at the set lowermost position (the position), the height of the working machine can be freely changed by operating the lowering restriction dial 60. Operability is better than that, and fine adjustment is possible.

The lower limit position of the lower limit dial 60 is defined by the lowermost position (position indicated by a dotted line) where the lift arm 19 can rotate and the uppermost position (position) of the lift arm. It is assumed that the lowermost position can be set in a range below the center position of the lift arm (the position indicated by the chain line), that is, in the range from the position to the position in FIG. In this way, by limiting the range of rotation of the lift arm 19 to the range of actual use, instead of the entire range, the resolution of the lowering-restriction dial 60 with respect to the rotational operation amount is increased, and fine adjustment is facilitated.

Although the rotary working machine has been described as the working machine in the present embodiment, the same effect can be obtained in a draft control using a plow working machine, a planting device for a rice transplanter, and the like. Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0018]

As described in detail in the above embodiment, the invention according to the first aspect regulates the lowermost position of the working machine by providing a lowermost restriction dial near the position lever. As a result, compared to the conventional type that mechanically restrains the operation of lowering the position lever, the configuration of the control device is simplified, which can contribute to cost reduction, and it is easy to understand for operators unfamiliar with work. Is significantly improved.

According to the second aspect of the present invention, the operation of the lowermost restriction dial is prioritized over the operation of the position lever. Therefore, the position of the lift arm, that is, the working machine is changed in real time, and the lowered position of the working machine is confirmed. Therefore, it is possible to contribute to improvement of work reliability by reliable operation.

Further, the invention according to claim 3 is provided with a switch-type working machine elevating operation means different from the position lever, so that in addition to the effects of the invention according to claim 1 or 2, the lifting and lowering of the working machine is performed. Can be changed to the raised position or the lowered position by a simple operation.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 is a side view of a tractor to which a rotary working machine is connected.

FIG. 2 is a power transmission path diagram.

FIG. 3 is a block diagram of a control system.

FIG. 4A is a plan view of levers and dials provided near a driver's seat. (B) Side view of levers and dials provided near the driver's seat.

FIG. 5 is an explanatory diagram illustrating a lowermost position of a lift arm.

[Explanation of symbols]

 Reference Signs List 10 Tractor 14 Rotary work machine 19 Lift arm 50 Controller 52 Work machine elevating lever 54 Position lever 60 Lowering limit dial

Continuation of the front page (72) Inventor Yutaka Kashino 1 Yachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. F-term (reference) 2B304 KA08 KA13 LA02 LA05 LA07 LA09 LB05 LB15 MA03 MB02 MC08 PA01 PA07 PA11 PB06 QA08 QA11 QA22 QB13 QC14 RA08 RA27

Claims (3)

[Claims] 1. A work vehicle 10 having a position lever 54 for vertically moving a work machine 14 connected to a vehicle body by rotating a lift arm 19 and changing a height of the work machine 14. A work machine lifting / lowering control device for a work vehicle, wherein a lowering setting device 60 for controlling a lowering position of the lift arm 19 is provided near an operation position of the position lever 54 on a work machine lowering side. 2. In the work vehicle 10 provided with a position lever 54 for moving the work machine 14 connected to the vehicle body up and down by the rotation of the lift arm 19 and changing the height of the work machine 14. A lowering setting device 60 is provided for restricting the lowering position of the work implement by the position lever 54. When the lowering position of the lowering setting device 60 is changed from the setting position of the position lever 54 to the raising position, the position lever is set. A work machine lifting / lowering control device for a work vehicle, comprising: a control unit (50) for driving the lift arm (19) in preference to a set value of (54). 3. The work vehicle 10 is provided with a switch-type work machine lifting / lowering operation means 52 different from the position lever 54, and the lift arm 19 is lowered from the raised position by the switch-type work machine lifting / lowering operation means 52. The work machine lifting / lowering control device for a work vehicle according to claim 1 or 2, further comprising control means (50) for continuously moving up or down to the position.