JP2000071870A - Lighting system for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a necessity of separately providing a foot light for addition by maintaining the lighting condition of a light such as a front lamp or a lamp provided in a construction machine for the predetermined time after switching a starter switch from ON to OFF. SOLUTION: At the time of getting-off a cab after concluding the work, in the case of dark such as night, a starter switch 11 is switched to the OFF position for get-off while maintaining a light switch 9 ON, namely, while maintaining the lighting condition of a light L. In this case, since a light switching circuit B is connected to a delay circuit 13 for power source, after turning the starter switch off, the electrifying condition is maintained for the predetermined time. A light relay ryl is thereby maintained in the exciting condition for the predetermined time, and the light L is lightened for the predetermined time after turning the starter switch 11 off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a lighting device for a construction machine such as a hydraulic shovel used for various construction work and civil engineering work.

[0002]

2. Description of the Related Art In general, when a construction machine of this type is dark, such as at night or when it is raining, work is performed with lights such as a headlight for illuminating the front of the machine and a work light for illuminating a work unit. However, when the operator finishes the operation and gets off the driver's seat, the light has been turned off before the operator gets off the vehicle. In this case, it is dangerous to get off the driver's seat in the dark, so if the footlight is equipped, turn on the footlight.If the footlight is not equipped, flashlight etc. I was getting off while shining my feet with other lighting equipment.

[0003]

However, in addition to the usual equipment, the footlight needs to be additionally provided with a footlight and a switch which directly draws power from a battery, which hinders cost reduction. There is. On the other hand, if footlights are not provided to achieve cost reduction, it is necessary to keep flashlights and other lighting equipment at all times, or get off from the driver's seat with one hand holding a flashlight etc. The problem is that there is a risk of breaking the balance. Therefore, it has been proposed to get off the vehicle in a bright state with the lights such as the headlights and the work lights turned on.
Since the light switch 9 and the light L are connected to the main circuit A provided with the relay contact rym of the main relay RYM, when the starter switch 11 is turned off, the relay contact rym is opened and the light L
Therefore, when the starter switch 11 is turned off, the light L is also turned off at the same time, and cannot be adopted as it is, and the present invention is intended to solve this problem. There was a problem to do.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been created for the purpose of solving these problems, and includes a headlight, a work light, and the like provided on a construction machine. Light, starter switch from ON to OF
Even after switching to F, the lighting state can be maintained for a predetermined time. By doing so, when getting off in the dark, such as at night, it is possible to get off with the lights provided on the construction machine turned on, and the operator may lose balance in the dark. It is possible to avoid the situation, and it is not necessary to additionally install a foot light, which contributes to cost reduction. In this case, a power supply delay circuit provided in the construction machine can be used as a power supply source for maintaining the lighting state of the light after the starter switch is turned off. In addition, by providing an illuminance sensor for detecting the illuminance and turning off the light when the detected illuminance is high, it is possible to prevent the light from being turned on in a warm daytime or the like, and to waste battery power. Can be prevented.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 is disposed on a crawler-type lower traveling body 2, an upper revolving body 3 rotatably supported by the lower traveling body 2, and the upper revolving body 3. The basic configuration of the cab 4 and the working unit 5 attached to the front of the upper revolving unit 3 is the same as the conventional one.

Further, the hydraulic excavator 1 is mounted on a front part of an upper revolving unit 3 or an intermediate part of a boom 7 to illuminate a working unit 5 to illuminate a front part of the body. Various lights L such as work lights 8 are provided. The cab 4 is provided with a light switch 9 for turning on and off the lights L.

A starter switch (ignition switch) 11 is provided in the cab 4.
By switching from the F position to the ON position, the electric system of the excavator 1 is configured to be energized. That is, when the starter switch 11 is turned on, the main relay RYM is excited and the main relay contact rym (a contact) is closed, whereby the main circuit A is energized, and various electric devices and devices (not shown) Power is supplied from the battery 12 to the equipment.

Further, reference numeral 13 denotes a power supply delay circuit (off).
The power supply delay circuit 13 turns the starter switch 11 from the ON position to the OFF position.
Even after switching to the F position, the power from the battery 12 can be supplied for a predetermined time T1 set in advance. The power supply delay circuit 13 includes:
An unillustrated device for depressurizing the hydraulic circuit, an electric lock valve, an engine pump controller, etc. are connected,
After the starter switch 11 is turned off, depressurization of the hydraulic circuit, activation of the electric lock valve, and writing of various data in the memory of the engine pump controller can be performed.

On the other hand, the light L is directly connected to the battery 12 with a light relay contact ryl (a contact) interposed. The light switch 9 is connected to the power delay circuit 13 via a fuse 14. The light switch circuit B provided with the light switch 9 includes a light relay RYL and a switch contact of the illuminance sensor 15. 15a is connected to the light switch 9 in series. Here, the switch contact 15a of the illuminance sensor 15 is set to be opened when the illuminance detected by the illuminance sensor 15 is high (bright) and closed when the illuminance is low (dark). still,
As the illuminance sensor 15, for example, a sensor using a cadmium sulfide cell (CdS) having a high resistance value when the illuminance is low and a low resistance value when the illuminance is high can be used.

In this embodiment, the starter switch 11
When the light switch 9 is turned on in a dark state, such as at night, in a state where is turned on, the light switch circuit B is closed and the light relay RYL is excited, whereby the light relay contact ryl is closed and the light L is turned on. Electric power is supplied from the battery 12, and the light L is turned on. When the light switch 9 is turned off from this state, the light switch circuit B is opened and the light relay RYL is de-energized, whereby the light relay contact ryl is opened and power supply from the battery 12 is performed. When cut off, the light L is turned off.

On the other hand, when the work is completed and the user gets off the cab 4, when the vehicle is dark such as at night, the light switch 9 is turned on.
Is turned on, that is, while the light L is lit, the starter switch 11 is switched to the OFF position to get off the vehicle. In this case, since the light switch circuit B is connected to the power supply delay circuit 13, the energized state is maintained for a predetermined time T1 even after the starter switch 11 is turned off. Accordingly, the light relay RYL is also kept in the excited state for the predetermined time T1, and the light L remains lit for the predetermined time T1 after the starter switch 11 is turned off. After the lapse of the predetermined time T1, the power supply from the power supply delay circuit 13 to the light switch circuit B is cut off, and the light L is turned off. Note that the lighting time of the light L after turning off the starter switch can be arbitrarily set by changing the delay time TI of the power supply delay circuit 13.

When the vehicle is to be disembarked at night or when it is dark, such as during rain, when the starter switch 11 is switched to the OFF position while the light switch 9 is kept ON, the starter switch is turned off. 11 for O
For a predetermined time T1 after the FF, the light L is kept lit, so that the driver can get off the vehicle while the light L is lit.

As a result, when the user gets off the vehicle in the dark at night or the like, the user can get off the vehicle in a bright place where the light L is turned on. This eliminates the need to do so and avoids losing balance when getting off the vehicle. In addition, since this light utilizes the light L pre-installed on the hydraulic excavator 1 as it is, there is no need to separately add a foot light, which can contribute to cost reduction.

Further, in this apparatus, the power supply for turning on the light L even after the starter switch 11 is turned off utilizes a power supply delay circuit 13 provided in the hydraulic excavator 1 in advance. In this respect, the existing one can be effectively used, which is convenient.

Also, in this case, after getting off the vehicle with the light L turned on, the next time the hydraulic excavator 1 is boarded, the light switch 9 remains ON. The light L will be turned on. In this case, the light switch 9 may be left as it is when it is dark at night or the like, but it is necessary to turn off the light switch 9 when it is bright at daytime or the like. In this case, the switch contact 15a of the light switch circuit B is opened and the light L does not turn on. As a result, even if the operation of turning off the light switch 9 is forgotten, the light switch 9 can be used in a bright daytime or the like. It is possible to prevent the battery L from being wastefully consumed due to the light L remaining on.

It should be noted that the present invention is not limited to the first embodiment, and the second embodiment shown in FIGS.
It can also be configured as in the third embodiment. In the second and third embodiments, the same components (common components) as those in the first embodiment are not described, and are denoted by the same reference numerals. First, the second embodiment will be described with reference to FIG. 3. The fact that the light switch circuit B provided with the light switch 9 and the light relay RYL is connected to the power supply delay circuit 13 is the first embodiment. In the second embodiment, the light switch circuit B is the same as that of the second embodiment.
And a light relay R in series with the light switch 9.
The holding relay RYD is incorporated in parallel with YL, and the switch contact 11a of the starter switch 11 is connected to the light holding circuit C connected in series with the holding relay RYD and in parallel with the light switch 9. (B
The contact ryd and the contact ryd (a contact) of the holding relay RYD are connected in series. Here, the switch contact 11a of the starter switch 11 is closed when the starter switch 11 is OFF, but is set to open when the starter switch 11 is switched to the ON side.

Also in the second embodiment, the light L can be turned on for a predetermined time even if the light switch 9 is turned off when the user gets off the vehicle. That is, in this device, when the starter switch 11 is switched to the ON position, the switch contact 11a is open, and the write holding circuit C is in a non-energized state. In this state,
When the light switch 9 is turned on and off, the light relay RYL is excited and de-energized accordingly.
The light L is turned on and off.

On the other hand, when the excavator 1 is dark at night or the like,
When the starter switch 11 is switched to the OFF side while the light switch 9 is kept ON at the time of getting off, power from the power supply delay circuit 13 is supplied to the light holding circuit C for a predetermined time T1, and Since the switch contact 11a of the starter switch 11 is closed and the contact ryd of the holding relay RYD is closed, the write holding circuit C is energized. Even if the light switch 9 is turned off in this state, the holding relay RYD
Is kept, the contact ryd is kept closed. As a result, during the predetermined time T1, the light holding circuit C is turned on, the light relay RYL is held in the excited state, and the light L is held in the lighted state. After the elapse of the predetermined time T1,
The light holding circuit C is turned off, and the light L is turned off. When the vehicle gets off in a bright daytime or the like, since the light switch 9 is originally OFF, the light holding circuit C is not energized while the contact ryd of the holding relay RYD is kept open. When the starter switch 11 is turned off during a warm daytime or the like, the problem that the light L is turned on does not occur.

The second embodiment has the same effects as the first embodiment, and when the light switch 9 is turned off at the time of getting off the vehicle in the same manner as the conventional one, the next time Turn off light switch 9 when boarding
Eliminates the need for operation and is excellent in operability. Incidentally, also in the second embodiment, the light L in the daytime or the like is used.
In order to avoid unnecessary lighting, an illuminance sensor similar to that of the first embodiment may be provided. In the first and second embodiments, the light L may not be directly connected to the battery 12 but may be supplied with power via the power supply delay circuit 13.

Further, a third embodiment will be described with reference to FIG. 4. This embodiment is applicable to a construction machine which is not equipped with a power supply delay circuit 13 in advance, and which can be used even after the starter switch 11 is turned off. The light L can be turned on for a predetermined time. In other words, this time delay return contact (a) opens the relay contact ryl of the light relay RYL connected in series to the light L with a delay of a predetermined time T2 set after the light relay RYL is de-energized. Contact), and by doing so, the starter switch 11 is turned off.
After that, the lighting state of the light L can be maintained for a predetermined time T2 after the light switch 9 is turned off. In the third embodiment, an illuminance sensor can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hydraulic shovel.

FIG. 2 is an electric circuit diagram according to the first embodiment.

FIG. 3 is an electric circuit diagram according to a second embodiment.

FIG. 4 is an electric circuit diagram according to a third embodiment.

FIG. 5 is an electric circuit diagram in a conventional example.

[Explanation of symbols]

 6 Headlight 8 Work light 9 Light switch 11 Starter switch 13 Power delay circuit 15 Illumination sensor

Claims (3)

[Claims] 1. A lighting device for a construction machine, wherein a light such as a headlight or a work lamp provided on the construction machine can be maintained in a lighting state for a predetermined time even after a starter switch is switched from ON to OFF. . 2. The lighting device for a construction machine according to claim 1, wherein a power supply delay circuit provided in the construction machine is used as a power supply source for maintaining a lighting state of the light after a starter switch is turned off. 3. The illuminating device according to claim 1, wherein the illuminance is detected and an illuminance sensor for turning off the light when the detected illuminance is high is provided.