JP2011127395A - Lighting system for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a lighting drive unit of a conventional construction machine, so as to illuminate both right and left of the working machine while preventing a damage due to earth and sand and a short circuit due to wetting with water. <P>SOLUTION: A lamp housing 6a is supported by a horizontal shaft 10 in a vertically swingable and rotatable manner, and a two-pronged bracket 9 supporting the horizontal shaft is supported by a vertical shaft 12 in a horizontally swingable and rotatable manner. The lamp housing 6a is provided with a vertical drive mechanism 11, and the two-pronged bracket 9 is provided with a right-and-left drive mechanism 13. A ballast 8 of a discharge lamp 7 is arranged in the lamp housing 6a and protected from the damage due to earth and sand and water leakage. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an excavator and an illumination device for irradiating the periphery of an attached movable part when working with a shovel work machine.

  Regarding this type of technology, Japanese Patent Laid-Open No. 2000-240101 “Construction Machine Illuminating Lamp Drive Device” disclosed in Patent Document 1 is known. FIG. 5 is a schematic diagram of a lighting device according to the known technique. In the shovel car 3, an arm 3b is pivotally attached to the tip of a boom 3a that can be tilted up and down, and a bucket 3c is pivotally attached to the tip of the arm 3b.

  In this known example, an illumination lamp 4 that can be pivoted up and down is installed on the side surface of the boom 3a, and a link that links the illumination lamp 4 to the movement of the boom 3a so that the illumination lamp always illuminates the vicinity of the bucket 3c. A mechanism 5 is provided. The shovel car 3 also includes a normal illuminating lamp 19 whose lighting direction is fixed. However, when the boom 3a is tilted or the arm 3b is rotated, the bucket 3c comes out of the irradiation range of the illuminating lamp 19. End up. However, the illumination lamp 4 can always irradiate the vicinity of the bucket 3c in conjunction with the movement of the boom 3a by the action of the link mechanism 5.

JP 2000-240101 A

  However, in the known example shown in FIG. 5, the illumination lamp 4 can swing its head up and down, but cannot swing its head left and right. For this reason, it is impossible to irradiate signs provided in the workplace or structures that should not be touched (for example, water pipes), which is inconvenient and dangerous for night work and tunnel work.

  The present invention has been made in view of the above circumstances, and its purpose is to swing the head not only up and down, but also to the left and right, and is small in size and weatherproof against contact with soil and water. An object of the present invention is to provide an excellent lighting device for a work machine.

  As a result of diligent research in view of the above-mentioned problem, the inventor is able to swing his head not only vertically but also horizontally, and is small in size and has excellent weather resistance against soil contact and water wetting. Came up with a lighting device.

That is, the illuminating device according to the present invention includes a bracket that is rotatably supported around a first shaft member in a vertical direction installed in an excavator work machine, and a second horizontal member that is supported by the bracket. A lamp housing supported rotatably about the shaft member, a reflector disposed in the lamp housing, a discharge lamp provided near the focal point of the reflector, and installed in the lamp housing, A ballast for stabilizing the lighting by limiting the discharge current of the discharge lamp to a specified value, a first driving mechanism for rotating the bracket around the first shaft member, and the lamp housing for the second A lighting device having a second drive mechanism that rotates around a shaft member, wherein the first drive mechanism and the second drive mechanism are controlled independently to move up and down. Characterized in that it rotates to the right.
Accordingly, the illumination device of the present invention is suitable because the illumination direction of the illuminating lamp can be turned up and down and left and right during the work of the excavator work machine. Moreover, since the ballast of the discharge lamp is housed in the lamp housing, it is compact and protected from earth and sand and water. Sufficient protection of the ballast that handles high voltages for discharge lamps is very important in construction machines.

Further, in the lighting device according to the present invention, the first drive mechanism has a rotation range around the first shaft member limited by a limit switch installed between the work implement and the bracket. The second drive mechanism is characterized in that a rotation range around the second shaft member is limited by a limit switch installed between the bracket and the lamp housing.
Thereby, since the rotation angle range of the illuminating device for the working machine is automatically limited, it is possible to prevent erroneous operation and to illuminate only a necessary place.

Moreover, the lighting device according to the present invention is characterized in that the first drive mechanism includes means for giving resistance to rotation of the bracket.
Thereby, even if work is performed while the work implement vibrates, it is possible to obtain excellent earthquake resistance that the irradiation direction of the lighting device is stabilized without being displaced.

Further, the lighting device according to the present invention is characterized in that the second drive mechanism includes means for giving resistance to rotation of the lamp housing.
Thereby, even if work is performed while the work implement vibrates, it is possible to obtain excellent earthquake resistance that the irradiation direction of the lighting device is stabilized without being displaced.

It is a schematic diagram which shows the working state of the shovel car provided with the illuminating device for working machines which concerns on this invention. The illuminating device for working machines which concerns on this invention is shown, (A) is an external appearance side view, (B) is a cross-sectional side view. It is a general | schematic electrical system diagram in the illuminating device for working machines which concerns on this invention. FIG. 3 is a schematic diagram illustrating a main part of a drive mechanism according to an embodiment of the present invention. It is the side view on which the illumination light drive device of the construction machine which concerns on a well-known technique was drawn.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. 1 to 4 are diagrams illustrating embodiments of the present invention. In these drawings, the same reference numerals denote the same components, and the basic configuration and operation are the same. To do.

FIG. 1 shows an embodiment of the present invention, and reference numeral 3 denotes an excavator as an example of an excavator work machine. Whereas the conventional illuminating lamp 4 is mounted on the side surface of the boom 3a, the illuminating lamp 6 of the present embodiment is installed on the roof of the cab 3d via the bifurcated bracket 9.
Whereas the conventional illuminating lamp 4 has a structure that only pivots up and down, the illuminating lamp 6 of this embodiment pivots up and down as shown in the angle θ and is vertical as shown by an arc arrow φ. It also rotates around the axis Z. Further, while the rotation of the conventional illumination lamp 4 is controlled by the link mechanism 5, the illumination lamp 6 of the present embodiment is independent of vertical drive and left / right drive by a drive mechanism described later with reference to FIG. 3. To be controlled.

FIG. 2A shows an enlarged detail of the illumination lamp 6. The illuminating lamp 6 includes a front lens 6c that covers the front opening of the lamp housing 6a, and the front lens 6c is fixed by a lens holder 6d. The lamp housing 6a is rotatably supported by the horizontal shaft 10, and the irradiation direction moves up and down by the rotation around the horizontal axis. Reference numeral 11 denotes a vertical drive mechanism that moves the illumination lamp 6 up and down, and details thereof will be described later with reference to FIG.
The horizontal shaft 10 is supported by a bifurcated bracket 9, and the bifurcated bracket 9 is rotatably supported by a vertical shaft 12, and the illumination lamp 6 is rotated by rotation around the vertical shaft 12 (arrow φ). The irradiation direction moves left and right. Details of the left / right drive mechanism 13 for moving the illumination lamp 6 left / right will be described later with reference to FIG.

FIG. 2B shows a cross section of the main part of the illuminating lamp 6. The discharge lamp 7 is provided in the center of the reflector 6b, and the light emission portion of the discharge lamp 7 is set to be located near the focal point of the reflector 6b. Thereby, the diffused light beam from the discharge lamp 7 is reflected by the reflector 6b to become a substantially parallel light beam, and is condensed and irradiated by the front lens 6c.
A ballast 8, which is a ballast for limiting the discharge current of the discharge lamp 7 to a specified value and maintaining stable lighting, is disposed between the lamp housing 6a and the reflector 6b. Ballasts in conventional lamps are attached to the outside of the lamp housing, or installed at locations away from the lamp housing and connected with wires, so they are damaged by earth and sand, or get wet when leaked by water. There was a fear. However, since the ballast 8 of the present embodiment is sealed in the reflector 6b, there is no risk of being damaged by earth or sand or getting wet due to water and leaking electricity, and is suitable as a lighting apparatus for construction work machines, and It is configured in a small size.

FIG. 3 is an electrical system diagram in the present embodiment. M1 is a vertical movement motor provided in the vertical drive mechanism 11 shown in FIG. 2A, and H is a horizontal axis. M2 is a left / right motor similarly provided in the left / right drive mechanism 13, and Z is a vertical axis.
The motor of the present embodiment is a DC motor that can change the rotation direction. The vertical movement motor M1 rotates forward when a positive potential is applied to the terminal t1, and rotates the irradiation direction of the illumination lamp 6 upward. When a negative potential is applied to the terminal t1, it reverses and rotates the irradiation direction of the illumination lamp 6 downward. On the other hand, the left / right motor M2 rotates forward when a positive potential is applied to the terminal t3 and rotates the irradiation direction of the illuminating lamp 6 leftward, and reverses when the negative potential is applied to the terminal t3. Turn the direction to the right.

The discharge lamp 7 is connected to a DC power source via the ballast 8 and the relay switch X1. S2 is a vertical movement operation switch that switches the rotation direction of the vertical movement motor M1, and is connected to the vertical movement motor M1 via the vertical movement limit switch L1, and S3 is a left and right switch that switches the rotation direction of the left and right movement motor M2. It is a dynamic operation switch, and is connected to the left / right motion motor M2 via the left / right motion limit switch L2.
The vertical limit switch L1 includes two switching contacts L1a and L1b in parallel, and diodes D1 and D2 are connected in parallel to the switching contacts L1a and L1b, respectively. Similarly, the left / right limit switch L2 includes two switching contacts L2a and L2b in parallel, and diodes D3 and D4 are connected in parallel to the switching contacts L2a and L2b, respectively.

  FIG. 4 is a schematic diagram showing the configuration in the vicinity of the vertical movement limit switch L1, and the configuration in the vicinity of the horizontal movement limit switch L2 is the same (details will be described later). As shown in FIG. 2, when the illuminating lamp 6 swings up and down, the lamp housing 6 a rotates up and down with the forked bracket 9 stationary. Since the vertical drive mechanism 11 is installed in the lamp housing 6a, the bifurcated bracket 9 supports a couple and the lamp housing 6a is rotated. That is, the rotating member (lamp housing) is the driving side, and the stationary member (bifurcated bracket) is the driven side.

The cam 18 shown in FIG. 4 is fixed to the bifurcated bracket 9. The sun gear 14 of the vertical drive mechanism 11 is fixed to the lamp housing 6a. On the other hand, the planet gear 15 is rotationally driven by a vertical movement motor M <b> 1 of the vertical drive mechanism 11. Thereby, when the vertical movement motor M1 rotates, the planet gear 15 rotates around the sun gear 14 (arrow r), and the lamp housing 6a rotates up and down around the horizontal axis 10.
The vertical drive mechanism 11 is provided with a vertical movement limit switch L1 having two switching contacts L1a and L1b and fixed to the lamp housing 6a on the driving side, and a cam follower fixed to the switching contacts L1a and L1b. Is in sliding contact with the cam 18.

  The cam 18 has a circular shape that is substantially concentric with the horizontal shaft 10 on the entire circumference, and has a recess c formed at one location. The two open / close contacts L1a and L1b face each other across the cam. When the cam follower rides on the arc of the cam as in the illustrated switching contact L1b, the contact is closed, and when the cam follower falls into the cam recess c as in the switching contact L1a, the contact opens. For this reason, both of the two switching contacts L1a and L1b do not open at the same time. Normally, when both are closed and the lamp housing 6a is rotated to a predetermined angle (for example, ± about 180 degrees), The switching contact is set to open.

  4 described above relates to an operation in which the lamp housing 6a rotates up and down around the horizontal axis 10. As for the operation in which the bifurcated bracket 9 shown in FIG. 2 rotates left and right around the vertical axis 12, as shown in parentheses in FIG. 4, the symbol 10 (horizontal axis) is read as 12 (vertical axis), and the symbol L1a , L1b (open / close contact) may be read as L2a, L2b, and the code M1 (vertical motor) may be read as code M2 (left-right motor).

  The friction plate 16 shown in FIG. 4 provides frictional resistance to the vertical rotation of the lamp housing 6a and stabilizes the position of the lamp housing that is a rotating member. The friction plate 16 is a sun gear 14 or a cam 18 that is a stationary member. The pressure spring 17 presses and urges the friction plate 16 to give a frictional resistance between the lamp housing 6a and the sun gear 14 or the cam 18. Similarly, frictional resistance can be given to the left and right rotation of the lamp housing 6a. In general, construction work machines are subjected to severe vibration during work, but by applying frictional resistance to the rotation of the lamp housing 6a, the irradiation direction of the illumination lamp can be stabilized.

S1 shown in FIG. 3 is a light switch (main switch). When this is closed, the relay switch X1 is activated, and the discharge lamp 7 is energized via the ballast 8. Further, + 24V and −24V are applied to the terminals on the power source side of the vertical movement operation switch S2 of the vertical movement motor M1 and the left / right movement operation switch S3 of the left / right movement motor M2.
In the operating state of the illuminating lamp 6, when the vertical movement limit switch L1 is closed and the vertical movement operation switch S2 is operated to the left in the figure, a positive potential is applied to the terminal t1 of the vertical movement motor M1, and a negative potential is applied to the terminal t2. When applied, the vertical movement motor M1 rotates forward, and the illumination lamp 6 swings upward. On the other hand, when the vertical movement operation switch S2 is operated to the right in the figure, a positive potential is applied to the terminal t2 of the vertical movement motor M1, a negative potential is applied to the terminal t1, the vertical movement motor M1 is reversed, and the illumination lamp 6 is turned on. Swing downward.

  When the illuminating lamp 6 swings upward and reaches a predetermined angle (about +180 degrees), the opening / closing contact L1a is opened by the operation of the cam 10 so as not to rotate beyond this angle, and the vertical movement motor M1. Is turned off and the upward rotation stops. Therefore, when the vertical movement operation switch S2 is operated to the right in the drawing, a positive potential is applied to the terminal t2 of the vertical movement motor M1 through the switching contact L1b. In this state, the switching contact L1a for applying a negative potential to the terminal t1 is open. However, the current flows from the anode (anode) of the diode D1 connected in parallel to the switching contact L1a to the cathode (cathode), thereby moving up and down. When the motor M1 is energized, the up / down motor M1 rotates in the reverse direction, and the illumination lamp 6 swings downward.

  On the other hand, when the illuminating lamp 6 swings downward and reaches a predetermined angle (about −180 degrees), the opening / closing contact L1b is opened by the operation of the cam 10 so that it does not rotate beyond this angle. The energization of the dynamic motor M1 is cut off, and the upward rotation stops. Therefore, when the vertical movement operation switch S2 is operated to the left in the figure, a positive potential is applied to the terminal t1 of the vertical movement motor M1 through the switching contact L1b. In this state, the open / close contact L1b for applying a negative potential to the terminal t2 is open, but the current moves from the anode (anode) to the cathode (cathode) of the diode D2 connected in parallel with the open / close contact L1b. The motor M1 is energized, the vertical movement motor M1 rotates normally, and the illumination lamp 6 swings upward.

  When the left / right movement operation switch S3 is operated to the left in the figure, a positive potential is applied to the terminal t3 of the left / right movement motor M2, a negative potential is applied to the terminal t4, the left / right movement motor M2 rotates forward, and the illumination lamp 6 is turned on. Swing to the left. On the other hand, when the left / right movement operation switch S3 is operated to the right in the figure, a positive potential is applied to the terminal t4 of the left / right movement motor M2, a negative potential is applied to the terminal t3, the left / right movement motor M2 is reversed, and the illumination lamp 6 is turned on. Swing to the right.

  When the illuminating lamp 6 swings to the left and reaches a predetermined angle (about +180 degrees), the opening / closing contact L2a is opened by the operation of the cam 10 so as not to rotate more than this angle, and the left-right motor The energization of M2 is cut off, and the leftward rotation stops. When the left / right movement operation switch S3 is operated to the right in the figure, a positive potential is applied to the terminal t4 of the left / right movement motor M2 via the switching contact L2b. In this state, the switching contact L2a for applying a negative potential to the terminal t3 is open. However, the current flows from the anode (anode) to the cathode (cathode) of the diode D3 connected in parallel with the switching contact L2a. When the motor M2 is energized, the left / right motor M2 rotates in the reverse direction, and the illumination lamp 6 swings to the right.

  On the other hand, when the illuminating lamp 6 swings to the right and reaches a predetermined angle (about -180 degrees), the opening / closing contact L2b is opened by the operation of the cam 10 so as not to rotate beyond this angle. The energization of the left-right motor M2 is cut off, and the leftward rotation stops. Therefore, when the left / right movement operation switch S3 is operated to the left in the figure, a positive potential is applied to the terminal t3 of the left / right movement motor M2 via the switching contact L2b. In this state, the switching contact L2b for applying a negative potential to the terminal t4 is open. However, the current flows from the anode (anode) of the diode D4 connected in parallel to the switching contact L2b to the cathode (cathode). The motor M2 is energized, the left / right motor M2 rotates forward, and the illumination lamp 6 swings to the left.

An illuminating device for a working machine having such a configuration can freely change the illuminating direction by, for example, a controller that can be moved in the front / rear / left / right direction in the cab of a shovel car.
In the above-described embodiment, the excavator 3 is not always located on the horizontal hard ground. Therefore, vertical and horizontal are not strict meanings.

DESCRIPTION OF SYMBOLS 3 ... Excavator 3a ... Boom 3b ... Arm 3c ... Bucket 3d ... Cab 4 ... Illumination lamp 5 ... Link mechanism 6 ... Illumination lamp 6a ... Lamp housing 6b ... Reflector 6c ... Front lens 6d ... Lens holder 7 ... Discharge lamp 8 ... Ballast 9 ... Bent bracket 10 ... Horizontal shaft 11 ... Vertical drive mechanism 12 ... Vertical shaft 13 ... Left and right drive mechanism 14 ... Sun gear 15 ... Planet gear 16 ... Friction plate 17 ... Pressure spring 18 ... Cam c ... Recessed cam D1, D2, D3, D4 ... Diode L1 ... Vertical limit switch L2 ... Left / right limit switch L1a, L1b ... Open / close contact L2a, L2b ... Open / close contact M1 ... Vertical motion motor M2 ... Left / right motion motor SI ... Light switch S2 ... Vertical motion Operation Pitch S3 ... left and right movement operation switch X1 ... relay switch

Claims (4)

A bracket supported to be rotatable about a first shaft member in a vertical direction installed on an excavator work machine;
A lamp housing supported rotatably about a second shaft member in the horizontal direction supported by the bracket;
A reflector disposed within the lamp housing;
A discharge lamp provided near the focal point of the reflector;
A ballast that is installed in the lamp housing and stabilizes lighting by limiting a discharge current of the discharge lamp to a specified value;
A first drive mechanism for rotating the bracket around the first shaft member;
A second drive mechanism for rotating the lamp housing around the second shaft member,
An illuminating device for a working machine, wherein the first driving mechanism and the second driving mechanism are independently controlled to rotate vertically and horizontally.   In the first drive mechanism, a rotation range around the first shaft member is limited by a limit switch installed between the work implement and the bracket, and the second drive mechanism is The lighting device for a working machine according to claim 1, wherein a rotation range around the second shaft member is limited by a limit switch installed between a bracket and the lamp housing.   3. The lighting device for a working machine according to claim 1, wherein the first drive mechanism includes means for giving resistance to rotation of the bracket.   3. The lighting device for a working machine according to claim 1, wherein the second driving mechanism includes a unit that gives resistance to rotation of the lamp housing.