JPH11255076A - Wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a high visibility during work and thus offer a safe working environment by controlling two wipers optimally. SOLUTION: A power shovel is provided on its windshield with a main wiper for wiping mainly the windshield lower and central portions and a subsidiary wiper for wiping the windshield upper portion. A control part 9 is provided to monitor the engine oil pressure, shovel height, engine speed and the like to determine whether the power shovel is at work or not as well as the shovel position. While the power shovel is found to be at work, the subsidiary wiper is operated if the bucket position is high, or the main wiper is operated if the shovel position is low. While the power shovel is found not to be at work, on the other, both main and subsidiary wipers are driven alternately if the shovel position is middle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device, and more particularly to a technique which is effective when applied to optimum control of a wiper in an industrial heavy machine.

[0002]

2. Description of the Related Art According to studies made by the present inventor, a windshield of an operator's cab of an industrial heavy machine such as a power shovel is provided with a single wiper. It wipes out the rain on the windshield and secures visibility in rainy weather.

[0003]

However, the present inventor has found that the above-mentioned wiper device has the following problems.

That is, the windshield of a cabin of a construction machine generally has a vertically long shape, and it is difficult to make the wiped area by the wiper cover the entire surface of the vertically long windshield. In such a case, there is a problem that a field of view cannot be secured when an operator performs an operation while looking upward, and the operation is difficult to perform.

[0005] It is an object of the present invention to provide a wiper device capable of securing a view during work and obtaining a safe work environment by optimally controlling two wipers.

[0006]

According to the present invention, there is provided a wiper device comprising:
A position detection unit that detects the position of the work unit in the industrial heavy machine, and the position of the work unit detected by the position detection unit,
If lower than the first reference position, only the first wiper that mainly wipes the lower part of the glass unit is operated, and the working unit
When it is higher than the second reference position, only the second wiper that mainly wipes the upper part of the glass part is operated, and
When located between the first reference position and the second reference position, a wiper control including a first control unit that alternately operates the first wiper and the second wiper every predetermined number of times Means are provided.

Further, the wiper device according to the present invention is characterized in that the wiper control means includes a hydraulic pressure detecting section for detecting a hydraulic pressure for driving the working section, and a hydraulic pressure detected by the hydraulic pressure detecting section is lower than a reference. A second control unit that alternately operates the first wiper and the second wiper at predetermined times, and when the hydraulic pressure of the hydraulic pressure detection unit is high, control is performed by the first control unit. It is characterized by.

Further, in the wiper device according to the present invention, the wiper control means includes a rotation detector for detecting the number of rotations of the engine in the industrial heavy machine, and the rotation number of the engine detected by the rotation detector is smaller than a reference value. And a third control unit that alternately operates the first wiper and the second wiper every predetermined number of times when the engine rotation speed of the rotation detection unit is high. The control is performed by the control unit.

Further, in the wiper device according to the present invention, the position detecting section for detecting the position of the working section in the industrial heavy machine, and the position of the working section detected by the position detecting section may be higher than the third reference position. If lower, only the first wiper is operated,
When the working unit is higher than the third reference position, a wiper control unit including a fourth control unit that operates only the second wiper is provided.

Further, in the wiper device according to the present invention, the wiper control means includes: a hydraulic pressure detecting unit for detecting a hydraulic pressure for driving the working unit; and a hydraulic pressure detected by the hydraulic pressure detecting unit is lower than a reference. A fifth control unit that alternately operates the first wiper and the second wiper every predetermined number of times, and when the hydraulic pressure of the hydraulic pressure detection unit is high, the fourth control unit controls the first and second wipers. The second wiper is operated.

In the wiper device according to the present invention, the wiper control means may include a rotation detector for detecting the number of rotations of the engine in the industrial heavy machine, and the rotation number of the engine detected by the rotation detector may be higher than a reference value. And a sixth control unit that alternately operates the first wiper and the second wiper every predetermined number of times when the engine speed of the rotation detection unit is high. The control is performed by the control unit.

As described above, the operation of the first and second wipers is optimally controlled by the wiper control means depending on the position of the working section of the industrial heavy machine, so that the visibility of the glass section can be sufficiently ensured. Thus, the working efficiency can be greatly improved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view of a main wiper and a sub-wiper provided in a wiper device according to an embodiment of the present invention, FIG. 2 is a block diagram of the wiper device according to an embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram of an angle detection switch for detecting a position of a shovel provided with a wiper device.
4 is a flowchart of a wiper control circuit in the wiper device according to one embodiment of the present invention.

In the present embodiment, the wiper device 1
As shown in FIG. 1, a windshield FG of a cabin of a power shovel (industrial heavy machinery) is wiped. The wiper device 1 includes a main wiper (first wiper) 2 and a sub wiper (second wiper) 3.

The main wiper 2 mainly wipes the central part from the lower part of the windshield, and the sub-wiper 3 wipes the upper part of the windshield outside the wiping area of the main wiper 2. The main wiper 2 and the sub wiper 3 are provided at positions where a part of the wiping area overlaps.

As shown in FIG. 2, the wiper device 1 is provided with a main wiper motor 4 and a sub-wiper motor 5. The main wiper motor 4 operates the main wiper 2, and the sub wiper motor 5 operates the sub wiper 3. The wiper device 1 is provided with a wiper control circuit (wiper control means) 6, and controls all operations of the main wiper 2 and the sub-wiper 3.

The wiper control circuit 6 includes a main wiper motor forward / reverse drive unit 7, a sub wiper motor forward / reverse drive unit 8, and control units (first to sixth control units) 9. The main wiper motor forward / reverse drive unit 7 drives forward / reverse rotation of the main wiper motor 4, and the sub wiper motor forward / reverse drive unit 8 drives forward / reverse rotation of the sub wiper motor 5.

The control unit 9 controls all the operations of the main wiper motor forward / reverse drive unit 7 and the sub wiper motor forward / reverse drive unit 8 based on the various signals input.
The power supply switch SW1 and the wiper switch SW2 are connected to the control unit 9. The power switch SW1 is an ignition switch, and the wiper switch SW2
Is a switch for operating the wiper device 1.

Further, the control unit 9 includes a main wiper upper reversal position detection switch SW3, a main wiper lower reversal position detection switch SW4, a sub wiper upper reversal position detection switch SW5, and a sub wiper lower reversal position detection switch S.
W6 is connected.

Main wiper upper reversal position detection switch S
W3 and main wiper lower reverse position detection switch SW
4 detects the position of the main wiper 2, and the sub-wiper upper reversal position detection switch SW5 and the sub-wiper lower reversal position detection switch SW6 detect the position of the sub wiper 3.

The main wiper upper reversal position detection switch SW3 and the main wiper lower reversal position detection switch S
W4, the control unit 9 controls the braking and operation timing of the main wiper 2 between the main wiper 2 and the sub-wiper 3 by a signal detected by the sub-wiper upper reversing position detection switch SW5 and the sub-wiper lower reversing position detection switch SW6. I have.

The control unit 9 is connected to a hydraulic switch (oil pressure detecting unit) SW7.
W7 is provided in a hydraulic pressure passage used when performing an operation such as driving the shovel (working unit) S shown in FIG. 3 and prevents a decrease in the oil pressure when the oil pressure becomes higher than a predetermined value during the operation. The hydraulic switch SW7 is turned on at
Engine idle-up is performed. Here, in this oil pressure detection, the signal input to the control unit 9 is:
Instead of the ON / OFF signal of the hydraulic switch SW7, hydraulic data may be input.

Further, as shown in FIG. 2, the control unit 9 is connected to angle detection switches (position detection units) SW8 and SW9. These angle detection switches SW8, SW9
Is composed of a potentiometer or the like, and the control unit 9 calculates the height of the shovel S based on the angles detected by the angle detection switches SW8 and SW9.

Here, the angle detection switches SW8, SW9
3 will be described with reference to FIG.

The angle detection switch SW8 (FIG. 2) is connected to the first joint K of the first arm M1 provided at one end of the swing body of the power shovel so as to be rotatable by hydraulic pressure.
1 for detecting the angle of the first joint K1. The angle detection switch SW9 (FIG. 2) is provided on the second joint K2 at the other end of the first arm M1.

At the other end of the first arm M1, a second arm M2 is rotatably provided by hydraulic pressure, and the angle detection switch SW9 is connected to the angle of the second joint K2, that is, the first arm M1. The angle of the bend between the second arm M2 and the second arm M2 is detected. At the other end of the second arm M2, a shovel S is rotatably provided by hydraulic pressure.

The two angle detection switches SW8 and SW9 are used for detecting the position of the shovel S.
The position of the shovel S may be detected only by the two angle detection switches. In this case, the first joint K1
Is provided with an angle detection switch SW8.

Further, as shown in FIG. 2, an engine rotation detecting section (rotation detecting section) 10 is connected to the control section 9, and the engine rotation detecting section 10 controls the number of rotations of the engine in the power shovel. And outputs the detected rotation speed to the control unit 9.

Next, the operation of the present embodiment will be described with reference to FIG.
3 and 4 will be described.

First, when the wiper switch SW2 is turned on (step S101), the hydraulic pressure, the engine speed, and the shovel angle are input to the control unit 9, and the control unit 9
Determines whether the hydraulic pressure input through the hydraulic switch SW7 for driving the shovel is equal to or greater than a predetermined value, that is, whether the hydraulic switch SW7 is ON or OFF (step S102).

In the process of step S102, when the oil pressure is equal to or more than a predetermined value (the oil pressure switch SW7 is turned on),
The control unit 9 determines whether or not the engine speed of the power shovel detected by the engine speed detection unit 10 is equal to or higher than a predetermined value (Step S103).

Further, in the process of step S102,
When the oil pressure is lower than a predetermined value (the oil pressure switch SW7 is
In F), the control unit 9 determines that the work is not performed,
Control for operating the main wiper 2 and the sub wiper 3 alternately is performed (step S104).

At this time, the main wiper 2 and the sub-wiper 3 may be operated alternately each time, or after the main wiper 2 is operated several times (for example, about three times), the sub-wiper is operated several times. The operation (about three times) may be repeated.

In the process of step S103, if the engine speed of the power shovel is equal to or more than the predetermined value, the control unit 9 sets the shovel S based on the joints K1 and K2 detected by the angle detection switches SW8 and SW9. The position of the shovel S is calculated, and whether the shovel S is higher than a first reference position, which is a predetermined reference value, is determined from the calculation result (step S105).

In the process of step S105, when the control unit 9 determines that the position of the shovel S is higher than the first reference position, the shovel S is located above, and only the sub-wiper 3 is moved. Operate (Step S1
06).

In the process of step S105,
If the position of the shovel S is lower than the first reference position, it is determined whether the position of the shovel S is lower than the second reference position (Step S107).

In the process of step S107, when the control unit 9 determines that the shovel S is lower than the second reference position, the shovel S is located below, and only the main wiper 2 is operated. A control is performed (step S108).

The first reference position is, for example, a height at which the line of sight of an operator in the cabin moves above the horizontal, and the second reference position is, for example, a work in the cabin. The height at which the line of sight of the person moves below the horizontal. Therefore, between the first reference position and the second reference position, the operator's line of sight is horizontal and in the vicinity thereof.

In the process of step S106, when the control unit 9 determines that the position of the shovel S is higher than the second reference, the shovel S is moved between the first reference position and the second reference position, that is, Since the shovel S is located at a height near the position where the line of sight of the worker is horizontal, the processing of step S104 described above is performed.

Thus, according to the present embodiment, the wiper control circuit 6 determines the position height of the shovel S, whether or not the power shovel is working, and the like. Is operated, so that the field of view of the windshield FG can be ensured well.

Further, in the present embodiment, the position of the shovel S is determined based on the two references of the first reference position and the second reference position. For example, the position at which the worker's line of sight is horizontal is determined. 3, the sub-wiper 3 is operated only when the position of the shovel S is higher than the third reference position, and only the main wiper 2 is operated when the position of the shovel S is lower than the third reference position. You may make it do.

The operation of the wiper device 1 (FIGS. 1 and 2) in this case will be described with reference to the flowchart of FIG.
Here, the processing of steps S201 to S204 in FIG. 5 is the same as the processing of steps S101 to S104 shown in FIG.

In the process of step S203, when the engine speed is equal to or higher than the predetermined value, the control section 9 calculates the position of the shovel based on the detection signals of the angle detection switches SW8 and SW9, and It is determined whether the worker's line of sight is higher than a third reference position, which is a horizontal position (step S205).

If the position of the shovel is higher than the third reference position, the shovel is located above, and only the sub-wiper 3 is operated (step S20).
6). If the position of the shovel is lower than the third reference position, the shovel is located below, and only the main wiper 2 is operated (step S20).
7).

Also in this case, the wiper control circuit 6 determines the position height of the shovel, whether the power shovel is working, and the like, and operates the main wiper 2 and the sub-wiper 3 in an optimal state. Good visibility of the FG can be ensured.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

For example, in the above-described embodiment, a power shovel is described. However, not only the power shovel but also a wiper device for an industrial machine which requires a worker from above to below to secure a view from a crane truck or a bulldozer. By using this, it is possible to ensure a good field of view during work.

In the case of a crane truck, the operation of the main wiper and the sub-wiper is controlled depending on the position of a hook-shaped hanging portion (working portion) provided on the crane truck. In a bulldozer, the blade portion (working portion) is controlled. The operation control of the main wiper and the sub-wiper is performed depending on the position.

[0050]

(1) According to the present invention, the wiper control means optimally controls the first and second wipers regardless of the position of the working unit in the industrial heavy machine. The visibility of the glass part can be sufficiently ensured, and the working efficiency can be greatly improved.

(2) In the present invention, it is determined whether or not the work is being performed based on the hydraulic pressure or the engine speed, and the wiper control means optimizes the first and second wipers according to the work state. Since the control is performed, the visibility of the glass part can be sufficiently ensured, and the working efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main wiper and a sub-wiper provided in a wiper device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a wiper device according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram of an angle detection switch that detects a shovel position provided with a wiper device.

FIG. 4 is a flowchart of a wiper control circuit in the wiper device according to one embodiment of the present invention.

FIG. 5 is a flowchart of a wiper control circuit in a wiper device according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wiper device 2 main wiper (first wiper) 3 sub wiper (second wiper) 4 main wiper motor 5 sub wiper motor 6 wiper control circuit (wiper control means) 7 main wiper motor forward / reverse drive unit 8 sub wiper motor forward / reverse drive unit 9 Control unit (first to sixth control units) 10 Engine rotation detection unit (rotation detection unit) SW1 Power switch SW2 Wiper switch SW3 Main wiper upper inversion position detection switch SW4 Main wiper lower inversion position detection switch SW5 Sub wiper upper inversion position Detection switch SW6 Sub wiper lower reverse position detection switch SW7 Oil pressure switch (oil pressure detection unit) SW8, SW9 Angle detection switch (position detection unit) FG Windshield (glass unit) S Shovel (work unit)

Claims (6)

[Claims] A first wiper for mainly wiping a lower portion of the glass portion; and a second wiper for mainly wiping an upper portion of the glass portion, wherein the first wiper and the second wiper are provided. Is a wiper device for an industrial heavy machine that partially wipes off a position of a working unit in the industrial heavy machine, and a position detecting unit that detects a position of the working unit in the industrial heavy machine. Position is 1st
When the working part is lower than the reference position, only the first wiper is operated, and when the working part is higher than the second reference position, only the second wiper is operated. A first control unit for operating the first wiper and the second wiper alternately at predetermined times when the wiper is located between the first reference position and the second reference position; A wiper device comprising control means. 2. The wiper device according to claim 1, wherein said wiper control means detects a hydraulic pressure for driving said working unit, and a hydraulic pressure detected by said hydraulic pressure detector is lower than a reference. A second control unit that alternately operates the first wiper and the second wiper every predetermined number of times, and when the hydraulic pressure of the hydraulic pressure detection unit is high, the first control unit A wiper device for operating the first and second wipers. 3. The wiper device according to claim 1, wherein the wiper control unit includes a rotation detection unit that detects a rotation speed of an engine in the industrial heavy machine, and the rotation detection unit. A third control unit that operates the first wiper and the second wiper alternately at a predetermined number of times when the detected number of rotations of the engine is lower than a reference. The first and second wipers are operated by the first control unit when the engine speed is high. 4. A first wiper for mainly wiping a lower portion of the glass portion and a second wiper for mainly wiping an upper portion of the glass portion, wherein the first wiper and the second wiper are provided. Is a wiper device for an industrial heavy machine that partially wipes off a position of a working unit in the industrial heavy machine, and a position detecting unit that detects a position of the working unit in the industrial heavy machine. Position is 3rd
And a fourth control unit that operates only the first wiper when lower than the third reference position, and operates only the second wiper when higher than the third reference position. A wiper device comprising a wiper control means. 5. The wiper device according to claim 4, wherein the wiper control means detects a hydraulic pressure for driving the working unit, and a hydraulic pressure detected by the hydraulic pressure detection unit is lower than a reference. A fifth control unit that alternately operates the first wiper and the second wiper every predetermined number of times, and when the hydraulic pressure of the hydraulic pressure detection unit is high, the fourth control unit A wiper device for operating the first and second wipers. 6. The wiper device according to claim 4, wherein the wiper control means includes: a rotation detection unit configured to detect a rotation speed of an engine in the industrial heavy machine; A sixth control unit that alternately operates the first wiper and the second wiper every predetermined number of times when the rotation speed is lower than a reference,
A wiper device wherein the first and second wipers are operated by the fourth control unit when the engine speed of the rotation detection unit is high.