JPH0826024A - Working lamp device of construction machine - Google Patents

Abstract

PURPOSE:To insure the front field of vision at running of a vehicle and in the operating condition of a front working mechanism, and automatically insure the optimum front field of vision in the turning direction according to the turning speed when an upper turning body is turned. CONSTITUTION:Working lamps 24 are provided in an upper turning body, and illuminating light is irradiated through the slits of a wall. The working lamps 24 are provided with a horizontally rotationally moving mechanism having an electric motor 32, and when the upper turning body is turned, either of the two working lamps on the front side in the turning direction is rotationlly moved interlocking with the turning, so as to be able to irradiate in the direction. For the purpose, when a turning operation lever is operated, pressure is generated in either of two pilot pipings, the pressure is detected by a pressure sensor, the operated turning and the direction are detected by a working lamp control circuit, and the turning speed is detected by the pressure. Based on the signal from the control circuit, the working lamp positioned on the front side in the turning direction of the upper turning body is rotationally moved frontward in the turning direction, so as to provide illomination in this direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work light device mounted on a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art A hydraulic excavator is a typical construction machine. The hydraulic excavator has an upper revolving structure rotatably installed on a track-type lower traveling structure, and an operator rides on the upper revolving structure. A driver's cab is provided, and a front working mechanism for performing various works is operably connected. With this configuration, for example, the front working mechanism is operated at a predetermined position to excavate the earth and sand, and then the upper revolving structure is turned by a predetermined angle, so that the earth and sand are dumped on the dump truck or the like arranged at that position. To load. Here, the hydraulic excavator is provided with a work light because it is activated not only in the daytime but also at night, and during nighttime work, the work light is turned on to illuminate the work area to increase the visibility. I try to secure it.

[0003]

By the way, the work lamp according to the prior art is fixedly mounted on the upper revolving structure. Therefore, although the front field of view can be effectively ensured, when the upper revolving structure is swung. , It is not possible to illuminate the front part in the turning direction. Therefore, when operating the hydraulic excavator at a work site where there are obstacles around, there is a risk of collision with the obstacles when the upper swing body is turned. In addition, if an operator or the like is within the turning radius, it may not be possible to effectively take measures such as issuing an alarm to the operator or the like. Of course, since the work light is configured so that the illumination light can be spread over as wide a range as possible, it is possible to detect obstacles to some extent when the turning speed is slow, but the visibility in the front in the turning direction is still sufficient. It is extremely difficult to find obstacles, workers, etc. in advance, especially when turning at high speed.

The present invention has been made in view of the above points, and an object of the present invention is to drive a vehicle,
When the front working mechanism is operating, secure a front field of view, and when the upper revolving structure is swiveled, it is possible to automatically secure an optimal field of view in the swivel direction according to the swivel speed. It is in.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a work light provided on an upper revolving structure which is installed on a lower traveling structure so as to be revolvable, and a work light which is rotated horizontally. And a work light control means for detecting an operation stroke of the turning operation means when the turning operation means is operated and controlling a turning angle of the work light according to the operation stroke. The feature is that it is configured.

[0006]

The working light is normally directed to the front of the upper revolving structure. Therefore, when the vehicle is traveling or the front working mechanism is operated, the working light is turned on. The necessary field of view can be secured. Therefore, work such as traveling and excavation of earth and sand can be smoothly performed. On the other hand, when the turning operation means is operated to turn the upper swing body, the operation direction and the operation stroke are detected by the work light control means, and the operation speed and the operation stroke are in front of the upper swing body in the turning direction and correspond to the turning speed. The work light rotates at an angle. As a result, the front view in the turning direction can be effectively secured,
If an obstacle is present within the turning radius or an operator or the like is present, it is possible to avoid the obstacle or take necessary measures to issue an alarm.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Thus, FIG. 1 shows the overall construction of a work light device mounted on a hydraulic excavator as an example of a construction machine, FIG. 2 shows the control circuit of the work light device, and FIG. 3 shows the overall construction of the hydraulic excavator. FIG. 4 shows the external appearance of the front part of the hydraulic excavator, and FIG. 5 shows the external appearance of the main parts as seen from the direction of the arrow in FIG.

First, in FIG. 3, reference numeral 1 denotes a lower traveling body composed of right and left crawler tracks, and an upper revolving superstructure 2 is rotatably installed on the lower traveling superstructure 1.
Is provided with a driver's cab 3 on which an operator is boarded.
A front working mechanism 4 is also connected to the upper swing body 2. This front working mechanism 4 is provided with a boom 5 provided on the upper swing body 2 so as to be able to move up and down, an arm 6 rotatably connected to the tip of the boom 5 in the vertical direction, and a pivotable end of the arm 6. And a bucket 7 as a front attachment connected to the. The front working mechanism 4 includes a boom cylinder 5a and an arm cylinder 6
It is operated by a hydraulic actuator composed of a and a bucket cylinder 7a, and the left and right crawler belts constituting the lower traveling body 1 are each driven by a traveling hydraulic motor (not shown). Further, the swing of the upper swing body 2 is operated by a swing hydraulic motor 8 (see FIG. 2).

The turning operation mechanism is constructed as shown in FIG. In the figure, reference numeral 10 indicates a turning operation lever, and the turning operation lever 10 is provided in the operator's cab 3. An operating member 11 is connected to the turning operation lever 10, and when the turning operation lever 10 is turned, the operation member 11 swings about a shaft 12. At both ends of this operating member 11, springs 13a, 13
It is connected to the pilot valves 14L and 14R via b. Pressure oil from the hydraulic pump 15 is supplied to the pilot valves 14L and 14R, respectively.
Direction switching valve 17 for turning hydraulic motor 8 via 16R
It is supplied to the pilot portions 17L and 17R in the above and switches the direction switching valve 17.

When the turning operation lever 10 is operated in the direction of arrow A in FIG. 2, the pilot valve 1 is moved through the spring 13a.
4L operates so as to open, and the pressure oil from the hydraulic pump 15 flows from the pilot valve 14L to the pilot pipe 16
It is supplied to the pilot portion 17L of the directional control valve 17 via L, and the directional control valve 17 is switched from the neutral position (a) to one of the switching positions (b), whereby the turning hydraulic motor 8 is driven. Is supplied with pressure oil from the main pump 18 and rotates in the direction indicated by an arrow L in the figure, and as a result, the upper swing body 2 turns left. On the other hand, when the turning operation lever 10 is operated in the direction of arrow B, the pilot valve 14R is opened and the pressure oil from the hydraulic pump 15 is supplied to the pilot portion 17R of the switching valve 17 via the pilot valve 14R and the pilot pipe 16R, The direction switching valve 17 is switched to the other switching position (C), the turning hydraulic motor 8 rotates in the direction of arrow R, and the upper-part turning body 2 turns right. In this way, the upper swing body 2 is
The turning direction is determined based on the operating direction of the turning operation lever 10. Further, since the output flow rates from the pilot valves 14L and 14R change according to the operation stroke of the turning operation lever 10, the turning speed also changes.

As shown in FIG. 4, a work light 20 is attached to the boom 5 of the hydraulic excavator, and the work area is illuminated by turning on the work light 20. In addition to the working light 20, a lamp house 21 housing the working light 20 is provided at each of the left and right front portions of the frame 2a of the upper swing body 2.
L and 21R are formed. These lamp houses 21
In L and 21R, wall surfaces 22 and 23 are provided in the frame 2a, a work lamp 24 (see FIG. 1) is installed therein, and slits 22a and 23a are formed in these wall surfaces 22 and 23, and the slits 22a, The configuration is such that illumination light can be emitted via 23a. Here, as is apparent from FIGS. 4 and 5, the slits 22a and 23a are provided in front of the upper swing body 2, the slit 22a extends to the left side portion, and the slit 23a extends to the right side portion. . Therefore, the work lamps 24 provided in the lamp houses 21L and 21R can illuminate the front of the upper swing body 2 and
By rotating it in the horizontal direction, it is possible to perform lighting in a diagonally forward direction.

The work lamp 24 mounted in the lamp house 21L, 21R is provided with a mechanism for rotating it horizontally. Therefore, FIG. 1 shows a rotating mechanism of the work lamp 24 mounted in the lamp house 21L. Note that the lamp house 21R has the same configuration, so its illustration and description will be omitted. Further, in the following description, when distinguishing the members provided in the left lamp house 21L from the members provided in the right lamp house 21R, the corresponding reference numerals are given to the left members. Shall be suffixed with "L", and the right-hand member shall be suffixed with "R".

A rotating shaft 25 is connected to the work lamp 24, and the rotating shaft 25 is rotatably supported by a bearing 26. An operating lever 27 is connected to the work lamp 24, and a link plate 28 is pivotally attached to the operating lever 27. The other end of the link plate 28 has a rotating shaft 29.
Is pivotally attached to a drive lever 30 connected to the. The rotary shaft 29 to which the drive lever 30 is attached is connected to an output shaft 33 of an electric motor 32 via a two-stage worm gear speed reduction mechanism 31. As a result, the electric motor 3
When 2 is operated, the work light 24 can be rotated in the horizontal direction.

In the above structure, when the upper revolving structure 2 is revolved, one of the work lights 24L and 24R located on the front side in the revolving direction is revolved in association with this revolving operation, and the direction thereof is changed. It can be illuminated toward.
For this reason, pressure sensors 40L and 40R are attached to the pilot pipes 17L and 17R, and the pilot pipes 17L and 1R detected by these pressure sensors 40L and 40R are installed.
The pressure of 7R is taken into the work light control circuit 41. When the turning operation is performed and the pressure is generated in one of the pilot pipes 17L and 17R, the work light control circuit 41 detects that the turning operation is performed, and which side of the pilot pipe has the pressure. Detects the turning direction, and also detects the turning speed depending on how much pressure is generated. And this work light control circuit 4
The signal from 1 is input to servo circuits 42L and 42R that control the operation of the electric motors 32L and 32R that rotate the left and right work lights 24L and 24R.

At the work site, when the hydraulic shovel is operated at night to perform work such as excavation of earth and sand, the work lights 20, 24 (24L, 2L, 24L, 2L) are dark because the surroundings are dark and the visibility is poor.
4R) is turned on to illuminate. Normally, the work lights 24L, 24R face forward, and this position is the origin position of the work lights 24L, 24R. Therefore, when the vehicle is traveling, the visibility in the front of the traveling direction is good, and safe traveling is possible. Further, when the front work mechanism 4 is operated to perform a required work, since this work area is illuminated, it is possible to operate the front work mechanism 4 while surely observing the work area. Can be done efficiently.

When the upper revolving superstructure 2 is turned, there are cases in which obstacles are present within the turning radius or workers are entering, so the operator secures the field of view in the front of the turning direction. Therefore, it is necessary to take measures such as avoiding obstacles and issuing an alarm to workers. Here, the turning operation of the upper-part turning body 2 is performed by operating the turning operation lever 10.

Now, assume that the turning control lever 10 is turned in the direction of arrow A in FIG. 2 to turn the upper turning body 2 leftward. By the operation of the turning operation lever 10, pressure is generated on the pilot pipe 16L side, and this pressure increase is detected by the pressure sensor 40L and input to the work light control circuit 41. As a result, the work light control circuit 41
In addition, the turning operation is performed, and at what speed the turning operation is performed is detected based on the turning direction and the increased pressure. Then, the signal from the work light control circuit 41 is input to the servo circuit 42L, the electric motor 32L is operated, and the drive lever 30L, the link plate 28L, and the operation lever 27 are rotated via the worm gear reduction mechanism 21L. As shown in FIG. 6, the work lamp 24L rotates leftward from the original position. As a result, the front side in the turning direction can be illuminated, the visibility in this direction is improved, and it is possible to confirm the presence or absence of obstacles, workers, etc. within the turning radius.
As a result, it is possible to take measures such as an obstacle avoidance operation, an alarm to an operator or the like, a stop of turning, etc. early and effectively.

The turning speed changes according to the operation amount of the turning operation lever 10. That is, when the turning operation lever 10 is operated at a large angle, the pressure in the pilot pipe 16L increases and the direction switching valve 17 is completely switched, so that the turning hydraulic motor 8 rotates at a high speed, The turning speed becomes faster. However, when the operation stroke of the turning operation lever 10 is small, the pressure in the pilot pipe 16L does not become too high. For this purpose, the directional control valve 1
7 is maintained in a slightly switched state, the flow rate of the pressure oil supplied from the main pump 18 to the turning hydraulic motor 8 is small, and the turning speed is therefore slow. As described above, the pressure of the pilot pipe 16L is detected by the pressure sensor 40L, so that the work lamp 24L can be adjusted according to the turning speed.
Can be adjusted, and when the turning speed is fast, the working light 24L has a large turning angle so that the illuminating light reaches further forward in the turning direction, and when the turning speed is slow, The rotation angle of the work lamp 24L is also small, and the illumination light is emitted slightly forward in the turning direction.

On the other hand, when the turning operation lever 10 is operated in the direction of the arrow B, the upper turning body 2 turns right, but at this time also, pressure is generated in the pilot pipe 16R. On the basis of the pressure increase, similarly to the above, the work lamp 24R located on the right side of the upper swing body 2 is rotated rightward from the origin position, and as shown in FIG. The field of view can be effectively secured. Moreover, the rotation angle of the work lamp 24R is proportional to the operation stroke of the turning operation lever 10.

When the turning operation lever 10 is returned from either the left or right operation position to the neutral position, the pilot valves 14L and 14R are closed, so that no pressure is generated in either of the pilot pipes 16L and 16R. Therefore, the direction switching valve 17 returns to the neutral position, and the operation of the turning hydraulic motor 8 is stopped. Then, when the pressure does not rise in the pilot pipes 16L and 16R,
The work lamp 24L or 24R which has been turned by the operation of the turning operation lever 10 is returned to the original position.

In the above-described embodiment, the work lights are provided on both left and right sides of the upper swing body, and either the left or right work lights are rotated according to the turning direction. As described above, the work light 50 is provided on the ceiling of the operator's cab 3 via the rotating member 51 having a drive means such as an electric motor, and the work light 50 is provided in accordance with the operation direction and operation stroke of the turning operation lever. It may be configured to rotate in either the left or right direction at an angle according to the operation stroke.

[0022]

As described above, according to the present invention, the operation stroke of the turning operation means is detected, and the rotation angle of the work light is controlled according to the operation stroke. In addition, when the front working mechanism is activated, the front field of view is secured, and when the upper revolving structure is swiveled, the optimum field of view in the swivel direction can be automatically secured in accordance with the swivel speed. Produce the effect of.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a work light device mounted on a hydraulic excavator as an example of a construction machine.

FIG. 2 is a diagram illustrating a configuration of a control circuit of the work light device.

FIG. 3 is an overall configuration diagram of a hydraulic excavator.

FIG. 4 is an external view of a front portion of the hydraulic excavator.

5 is an external view of the main part as seen from the direction of the arrow in FIG.

FIG. 6 is an operation explanatory view of a work light.

FIG. 7 is an operation explanatory diagram of the work light in a state different from that of FIG. 6;

FIG. 8 is a structural explanatory view of a work light device showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 8 Turning Hydraulic Motor 10 Turning Control Lever 14L, 14R Pilot Valve 16L, 16R Pilot Piping 17 Directional Switching Valve 20, 24, 24L, 24R, 50 Work Light 21L, 21R Lamp House 22a, 23a Slit 25 Rotating shaft 32 Electric motor 40L, 40R Pressure sensor 41 Work light control circuit 42L, 42R Servo circuit 51 Rotating member

Claims (2)

[Claims] 1. A work light provided on an upper revolving structure rotatably installed on a lower traveling structure, a rotating member for rotating the work light in a horizontal direction, and a revolving operation means when activating the revolving operation means.
A work light control device for a construction machine, comprising: a work light control means for detecting an operation stroke of the turning operation means and controlling a turning angle of the work light in accordance with the operation stroke. 2. The upper revolving structure is provided with work lights respectively on the left and right sides in front of the upper revolving structure, and when the upper revolving structure is rotated, the work light located in the front in the revolving direction is directed forward in the revolving direction. The work light device for a construction machine according to claim 1, wherein the work light device is configured to be rotated in a direction.