JP2009174901A - Dust visualization device for coating booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust visualization device for a coating booth capable of visualizing coating particles, or the like, suspended in the coating booth by veiling formation by multiple reflection between mirrors. <P>SOLUTION: In this dust visualization device for the coating booth for visualizing suspended coating particles in the coating booth, wherein a conveyance route for a truck for loading an object to be coated is laid and a coating device is installed on the side; a pair of lengthwise-shaped mirrors 9, 9a facing in parallel are arranged on the truck running along the conveyance route, and a light source 10 equipped with a laser oscillator; a diffusion lens 12 arranged on the front for diffusing incident light longitudinally; and a lengthwise-shaped Fresnel lens 13 for converting outgoing light into parallel sheet light which is wide in the longitudinal direction is provided on an end domain so that the sheet light enters either of the mirrors 9, 9a at an oblique angle, in the longitudinal direction of the mirrors 9, 9a relative to the orthogonal direction of the mirrors 9, 9a, and the angle is set so that a veiling without gaps is formed by multiple reflection in the alternate oblique direction of the mirrors 9, 9a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dust visualization device for a coating booth for visualizing floating paint particles in a coating booth in which a conveying path for traveling a carriage for mounting an object is laid and a coating device is installed on the side thereof It is about.

  In order to improve the coating quality of the object to be coated, the flow of paint fine particles in the coating booth and the measurement of floating dust are being performed. For example, in order to visualize paint fine particles floating in the painting booth that cannot be caught by the naked eye, the scattered light of paint fine particles generated in the fan-shaped region is reflected by reflecting the laser light from the laser oscillator with a swinging mirror. Viewing with the naked eye or imaging with a camera is performed. On the other hand, in order to measure floating dust in a manufacturing space of an electronic component or a clean room, according to Patent Document 1, a horizontal scanning unit that scans a laser beam on a virtual plane in a space to be measured and a virtual plane are scanned. There is disclosed a floating dust measuring device including a vertical scanning unit that scans a laser beam in a direction perpendicular to a virtual plane and a two-dimensional sensor that detects scattered light of floating dust.

Further, according to Patent Document 2, it has a light beam generating means and first and second reflecting means for reflecting the light beam, and the first and second reflecting means are reflected each other a plurality of times. There is disclosed a particle detector for a wafer processing apparatus that is positioned relative to each other and that detects light scattered by particles by obliquely entering a light beam generating means.
Japanese Patent Laid-Open No. 7-229826 JP-A-62-215843

  According to Patent Document 1, unlike a simple swing of a mirror, a spatial region can be scanned in a fan shape, but a wide range in a room cannot be visualized. According to Patent Document 2, it is possible to form a light curtain in a rectangular range by multiple reflection of a longitudinal light beam of several mm from a collimating lens, but in any case thin light in a narrow space in the semiconductor manufacturing field Assuming measurement with a beam, if a large number of particles are floating, the light beam is attenuated, making it impossible to visualize the entire area.

  In view of the above, the present invention provides a paint booth dust visualization device that visualizes dust such as paint particles floating in a paint booth by forming a large-area light curtain with no gaps due to multiple reflections between mirrors. The purpose is to provide.

  In order to achieve this object, according to claim 1, the floating paint particles in the painting booth in which the conveying path for running the carriage for loading the object is laid and the painting device is installed on the side thereof are visualized. In a paint booth dust visualization device, a pair of vertically long mirrors that face each other parallel to each other are disposed on a carriage traveling on a conveyance path, and a laser oscillator is disposed in front of the mirror, and incident light is vertically elongated. A light source comprising a diffusing lens that diffuses the light into a vertical direction and a vertically long Fresnel lens that converts the emitted light into a parallel sheet light that is wide in the vertical direction. A light curtain with no gaps is formed between the mirrors by multiple reflections in the diagonal direction of the pair of mirrors, which are provided at the mirror end area so that they enter one mirror at an oblique angle. Characterized in that it is configured to.

  The parallel sheet light emitted from the light source by the Fresnel lens is incident on the mirror obliquely, and the reflection sheet light is incident on the opposite mirror, and is reflected between the pair of mirrors by multiple reflection at the predetermined oblique angle. A light curtain without a gap is formed in the longitudinal direction.

  According to the present invention, a wide-area light curtain is formed between vertically long mirrors by obliquely reflecting a wide sheet-shaped light beam by a Fresnel lens diagonally in a painting booth in a large space. Dust such as floating paint particles is visualized by light scattering. The wide sheet light suppresses the attenuation of the irradiation light as a whole due to light scattering of particles, thereby ensuring reliable visualization of the cloud-like dust group. Since the apparatus can travel in the depth direction along the conveyance path, it is possible to easily observe a wide spatial range.

  A paint booth dust visualization device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the painting booth, a pair of rails 2 are laid as a conveyance path for running a carriage (not shown) on which a vehicle body 1 that is an object is mounted, and a painting robot (see FIG. (Not shown) and a blower for exhausting the paint particles floating in the paint booth. Thereby, every time the vehicle body 1 is carried in, painting is performed with the paint sprayed from the painting gun of the painting robot.

  The dust visualization device is provided with a pair of frames 8 and 8a on both sides of a floor surface 7a of a dedicated carriage 7 on which the wheels 6 are placed at the four corners and placed on the rail 2, and these frames are A pair of vertically long mirrors 9 and 9a that are parallel to each other and that are parallel to each other, for example, having a height of about 2 m and a width of about 10 cm are attached, and the upper end of one frame 8 that is the upper end region of the mirror 9 is irradiated with sheet light. A light source 10 is attached.

  The light source 10 includes a laser oscillator 11, a diffusion lens 12 that is disposed in front of the laser oscillator 11 and diffuses the laser light in the vertical direction, and a parallel strip of 10 to several tens cm, for example, 30 cm wide in the vertical direction. And a Fresnel lens 13 for converting the sheet light. This light source is provided so that the sheet light is incident obliquely by an angle θ downward in the longitudinal direction with respect to the orthogonal direction of the other mirror 9a, so that the pair of mirrors 9 and 9a are directed in the oblique directions. Due to multiple incident reflections, a light curtain without gaps is formed in the vertical direction between these mirrors. That is, when the pair of mirrors 9 and 9a are vertically mounted in the vertical direction, the substantially upper end L1 indicated by the thick line of the sheet light is reflected from the vertical plane to the lower end L2 of the emission position by the vertical plane. It is set to do.

  In such a dust visualization device, the CCD camera 20 and its image data are stored in the memory 21a in order to take an image of the light curtain area, and an image is directly displayed by a switch operation, or for a predetermined time. A display unit 22 including an image processing unit 21 for reproducing image data can be attached.

  The operation of the paint booth dust visualization apparatus configured in this way is as follows. When the type of paint is switched or when the airflow state is observed to check the exhaust state of the floating paint, when the carriage 7 is placed on the rail 2 and the light source 10 is operated, as shown in FIG. , Between the mirrors 9 and 9a facing both sides along the rail 2 in parallel, the strip-shaped sheet light is obliquely incident on the opposite mirrors 9 and 9a in an oblique direction, thereby repeatedly reflecting while shifting downward. A light curtain intersecting each other and having no gap is formed on the vertical plane.

  If dust such as paint particles floats in the light curtain, it becomes visible to the naked eye by the scattered light, but can be monitored by the display unit 22 by taking an image with the CCD camera 20. In order to observe the dust state in a wide range in the depth direction, the imaging surface can be scanned by running the carriage 7 along the rail 2. Even when a large amount of dust is floating, the attenuation of the light beam is suppressed by the wide sheet light and is observed in a cloud shape, and the moving direction along the air flow can be easily confirmed.

  If necessary, the captured image is stored in the memory 21 a while being moved along the rail 2 and reproduced on the display unit 22, whereby the dust distribution in the booth space can be analyzed. Similarly, the flow state of the dust group can be analyzed by stopping the carriage 7 and storing and reproducing the captured image.

  In some cases, the light source 10 can be attached to the lower end portion of the frame 8 obliquely upward, and can be supported at an intermediate position between the other frames 8a. By providing motor-driven wheels on the carriage 7, it is possible to travel to an arbitrary position by a manual switch operation or to reciprocate a predetermined range. The pair of mirrors are not arranged in parallel to each other in the vertical direction, but other arrangement directions such as setting the longitudinal direction in the horizontal direction are possible.

  Furthermore, as another embodiment, the pair of mirrors can be attached to a frame that is detachably attached to the carriage for conveying the object to be coated instead of the dedicated carriage.

It is a figure explaining operation | movement of the dust visualization apparatus for coating booths by embodiment of this invention. It is a front perspective view of the same apparatus.

Explanation of symbols

1 Vehicle body
2 rails 7 trolleys
8, 8a Frame 9, 9a Mirror 10 Light source 11 Laser oscillator 12 Diffusing lens 13 Fresnel lens 20 CCD camera 22 Display unit

Claims (3)

In the painting booth dust visualization device for visualizing floating paint particles in the painting booth where the conveyance path for running the carriage to be coated is laid and the painting device is installed on the side,
A pair of vertically long mirrors facing each other parallel to each other is disposed on the carriage traveling on the conveyance path, and a laser oscillator, a diffusion lens disposed in front of the mirror and diffusing incident light vertically, and the emitted light A light source including a vertically elongated Fresnel lens that converts the sheet light into a wide parallel sheet light in the longitudinal direction, and the one of the mirrors at an angle oblique to the longitudinal direction of the mirror with respect to the orthogonal direction of the mirror Is provided in the end region of the mirror so as to be incident on
The coating booth dust visualization apparatus, wherein the angle is set so that a light curtain without a gap is formed between the mirrors by multiple reflections of a pair of mirrors in an oblique direction.   2. The dust visualization device for a coating booth according to claim 1, wherein the pair of mirrors are attached to a frame that can be mounted on a carriage for mounting an object to be coated.   A pair of mirrors facing each other in the vertical direction in parallel with each other are attached to a pair of frames on both sides of a dedicated carriage traveling on the conveyance path, and a light source transmits the sheet light to the orthogonal direction of the mirror. 2. The coating booth according to claim 1, wherein the mirror is provided in an upper end or lower end region of the mirror so as to be incident on one of the mirrors at an angle that is obliquely shifted downward or upward in the longitudinal direction of the mirror. Dust visualization device.

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