JPS60225668A - Dust removing apparatus in painting line of plastic product - Google Patents

Abstract

PURPOSE:To make it possible to simultaneously remove static electricity and dust, by involving air ionized by an ion generator in the air stream injected from an air nozzle to spray the same to an article to be painted. CONSTITUTION:Air ionized by an ion generator 36 is involved in air streams of compressed air injected from four air nozzles 27 mainly directed to an obliquely upward direction while air ionized by a lower side ion generator 36 is involved in air streams of compressed air injected from the other four air nozzles directed to an obliquely downward direction to be blown forwardly. The article (a) to be painted fed in front of a moving body 5 by a conveyor 1 receives air streams containing ionized air sprayed over the whole thereof by air nozzles 27 performing up-and-down reciprocal motion and left-and-right swing motion provided to a support 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for removing electrical charges and deposits from objects to be painted before painting in a coating line for plastic objects.

When the object to be painted is made of plastic, since plastic is a dielectric material, it is easily charged with static electricity due to friction and attracts dust floating in the air. Because dust becomes embedded and causes defects in the painted surface, a dust removal device is installed before the painting position on the painting line, but conventional dust removal devices use slow-speed air such as a fan to blow ionized air onto the object to be painted. After removing static electricity by blowing with a current, compressed air is blown at high speed from multiple air nozzles to remove dust. Since the object to be coated has had its static electricity removed, it becomes charged again due to friction with the air jetted at high speed from the air nozzle to blow away the dust and hair, and then the object is charged with air again while being transported to the painting position. This has the drawback of attracting dust inside and sticking to it, and since the air nozzle that blows out compressed air to blow away the clumps is fixedly installed near the conveyance line of the object to be coated, it does not cover the entire object to be coated. In order to blow compressed air, it was necessary to install a large number of air nozzles, which resulted in a large amount of air consumption, and it was necessary to use a large near compressor.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks, and to provide a dust removal device for a plastic product painting line that can remove static electricity and blow away dust at the same time, while also reducing compressed air consumption. This is the purpose.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In Fig. 1, 1 is a conveyor that suspends and conveys a plastic workpiece a in the horizontal direction, and is laid perpendicular to the conveyor 1 on two sides of a base 2 installed above the conveyor. A movable body 5 is placed on the two rails 3 and 3 so that it can move in the front and rear directions.
A pair of left and right lifting arms 6.6 that are reciprocated up and down by a drive device (not shown) protrude from both sides of the movable body 5, and a window hole 7 is formed in the front surface between the lifting arms 6.6. An elongated box-shaped support 8 is fixed horizontally. Inside this support 8, a long fixed link 10 whose width is approximately equal to the width thereof is supported in parallel on the bottom plate 11 by fixing both ends and the center thereof to a bracket 12 erected on the bottom plate 11 of the support 8. In front of this fixed link 10, a similarly long movable link 15 has both ends placed on brackets 16 erected on the bottom plate 11, and the widened part 14 in the center is connected to a motor fixed to the bottom plate 11. 18
The movable link 15 is placed on the upper surface of a disk 20 fixed to the output shaft 17 of the
and the fixed link 10, eight short links 21 whose tips are adjacent to each other and bent upside down are stretched parallel to each other, and both ends of each are connected to the fixed link 10 by pins 22 and 23, respectively. A parallel link machine LW is formed by these fixed links 1O1 connected to the movable link 15, and the short links 21-;)-, and each of the short links 21 is bent downward diagonally. 1) Air nozzles 27 are fixed to the tips of the u-shaped parts, and the air nozzles 27 alternately face in an upside-down diagonal direction, and are connected to the rear of the support body 8 via flexible hoses 28. This pipe 29 is connected to a compressed air supply source (not shown) by a hose 30, and the widened part placed on the disk 20 in the center of the moving link 15 A pin 26 protruding from an eccentric position on the -L surface of the disc 20 is fitted into a longitudinally long cam groove 25 formed in the cam groove 14, and when the motor 18 is started and the disc 20 is rotated, Due to the engagement between the pin 26 of the disc 20 and the cam groove 25 of the widened portion 14 of the movable link 15, the short link 21 of the parallel link mechanism is moved as shown by the solid line and the chain line in the figure.
By creating a rocking motion around the pin 22,
Each air nozzle 27 is configured to generate a swinging movement in the left and right direction. At the upper and lower edges of the window hole 7 on the front surface of the support body 8, a large number of grooves 32 in the axial direction formed on the circumferential surface of an elongated round bar made of an insulator are planted at equal intervals. A needle electrode 33 is embedded in the center of each of the round bars,
4 and the needle electrodes 3 on both sides of the length 'a-32.
Ion generators 3G and 36 each have a structure in which a linear electrode 35° 35, which is a counter electrode of No. 3, is installed in parallel above and below each air nozzle 27, with their long grooves 32 facing forward. The lead wire 34 and the linear electrode 35.35 of the needle electrode 33 are connected to the output terminal of a high voltage generator (not shown), and the needle electrode 33 is connected to the output terminal of a high voltage generator (not shown).
By applying a high voltage between the electrodes 33.35 and the linear electrodes 35, a corona discharge is generated between the electrodes 33.35, and the air at the front of each ion generator 36.36 is ionized. The air ionized by the upper ion generator 36 is mainly caught in the compressed air flow jetted from the four air nozzles 27 facing diagonally upward, and the air ionized by the lower ion generator 36 is The air nozzles 27 are mainly blown forward by being caught up in the air flow of compressed air ejected from the other four air nozzles 27 facing diagonally downward.

The object to be coated, which has been conveyed to the front of the movable body 5 by the conveyor 1, is moved forward and backward by the support 8 by the lifting arm 6, and also by the horizontal swinging movement by the parallel link mechanism. The air nozzle 27 blows a high-velocity air stream containing ionized air evenly over the entire surface to remove static electricity, and dust attached to the surface is blown away by the air stream. .

As specifically explained in the above embodiment, the dust removal device in the coating line for plastic products of the present invention reciprocates in a direction substantially perpendicular to the conveyance direction in the vicinity of the conveyance line that conveys the plastic objects to be coated to the coating position. A high voltage is applied between a large number of needle electrodes provided at intervals in the length direction and a counter electrode provided around the needle electrodes to create a corona between each of the needle electrodes and the counter electrode. An elongated ion generator that ionizes the surrounding air by generating an electric discharge, and an ion generator that compresses from the vicinity of the ion generator toward the object to be coated while swinging in the length direction of the ion generator. A plurality of air nozzles that eject air are provided, and the ion generator 1. The gist of this system is to draw in ionized air and spray it onto the object to be coated to remove electrical charges and deposits on the object. Since the compressed air is drawn into the air stream and blown at high speed, it is possible to simultaneously remove static electricity charged on the object to be coated and dust attached to the object. Since it reciprocates approximately at right angles and oscillates in the transport direction, compressed air can be sprayed evenly over the entire object to be coated with a small number of air nozzles, reducing compressed air consumption. Furthermore, since compressed air is blown onto the object to be coated from all directions by swinging the air nozzle, it is possible to reliably remove dust attached to the uneven surface of the object to be coated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a partially cutaway enlarged perspective view thereof. 1: Conveyor 6: Lifting arm 8; Support body 27: Air nozzle 33: Needle electrode 35: Linear electrode 36: Ion generator a: Object to be coated Applicant Asahi Okuma Sangyo Co., Ltd. Applicant Shishido Shokai Co., Ltd. Agent Patent Attorney Hiroshi Noguchi 8-

Claims (1)

[Claims] A support body that reciprocates in a direction substantially perpendicular to the conveyance direction near a conveyance line that conveys plastic objects to be coated to a coating position has a large number of counter electrodes and needle electrodes provided at intervals in the length direction. An elongated ion generator configured to ionize surrounding air by applying a high voltage between counter electrodes provided around the needle electrodes and causing corona discharge between the needle electrodes and the counter electrode, and the ion generator. A plurality of air nozzles are provided that eject compressed air from the vicinity of the ion generator toward the object to be coated while swinging in the length direction of the container, and the ion generator is applied to the air flow ejected from the air nozzles. A dust removal device for a coating line for plastic products, characterized in that it is configured to draw in ionized air and spray it onto the object to be painted to remove electrical charges and deposits from the object to be painted.