JPH0217965A - Dust separator - Google Patents

Abstract

PURPOSE:To make it possible to remove all of the electric charge together with dusts attached to the surface without fail by using a unit, as a nozzle unit for separating dust, wherein a corona discharge electrode connected to an AC power supply is positioned at the axis of a grounded nozzle. CONSTITUTION:The arrangement is such that a grounded nozzle 45 to deliver gases form a supply source 42 to the surface of a work and a nozzly unit 40 for separating dust equipped with a corona discharge electrode 46 which is disposed at the axis of the nozzle 45 and connected to an AC power supply 48 are mounted on a base which is provided in a booth so that it can travel along the surface of the work. As a result, all of the electric charge together with dusts etc., attached to the surface of the work can be removed without fail regardless of shape of the work, polarity of electric charge and quantity of electric charge thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dust removal device for mechanically and electrostatically removing dust and the like adhering to the surface of a workpiece.

(Prior art) Items molded from synthetic resin materials are susceptible to contact with other objects.
In some cases, contact with the air can easily cause the surface to become electrically charged, attracting dust, lint, etc., and this can cause the paint film to become rough if the surface is painted.

To avoid such problems, it is necessary to remove electrostatically adsorbed dust from the surface of the workpiece before painting.
A dust removal device as seen in Publication No. 74, that is, a dust removal device in which a large number of carbon fibers protrude around an air outlet.
The air blowing out from the jet nozzle mechanically wipes away dust on the surface of the workpiece, and at the same time neutralizes the electric charge on the surface of the workpiece with the carbon charged by contact with the jetted air flow. Proposed.

However, in this type of device, since static electricity is removed electrically, it is necessary to maintain a constant distance between the workpiece surface and the carbon fibers, so if the workpiece surface is uneven, It is difficult to remove static electricity uniformly, and since it uses charging due to the contact potential difference with the air, it may not be possible to achieve a static neutralization effect depending on the charged polarity of the workpiece surface, and in general, carbon fiber Since the amount of charge is related to the amount of discharged air, there is a problem in that the amount of air and the amount of charge cannot be set optimally.

(Problems to be Solved by the Invention) The present invention has been made in view of these inconveniences, and its purpose is to improve the shape of the workpiece, its charging polarity,
It is an object of the present invention to provide a new device that can reliably remove all of the charged charges along with dust attached to its surface, regardless of the amount of charged charges.

(Means for Solving the Problems) That is, the present invention is a dust removal device for achieving the above problems, and the present invention is a dust removal device that connects a supply source to a base disposed in a booth so as to be able to move along the surface of a workpiece. A dust removal nozzle unit equipped with a grounded nozzle for discharging the gas toward the surface of the workpiece, and a corona discharge electrode arranged at the axial center of this nozzle and connected to an AC power source. It is.

(Example) Therefore, the illustrated embodiment will be explained below.

First, an overview of the device will be explained using Figures 2.3.
In the dust removal booth indicated by reference numeral 1 in the figure, there is a running path 3 for the trolley 2 that passes through the inside from the entrance to the exit.
A side dust removal device 110.1o for removing dust etc. attached to the side surface of the workpiece W is movably disposed on the rails 11.11 laid on both sides of the running path 3. In addition, on the rails 51.5 stretched perpendicularly to the running path 3 at the upper part of the entrance and exit sides, there is a front and rear dust removal device 1 for removing dust etc. attached to the front and rear surfaces of the workpiece W.
150.50 is similarly disposed so as to be movable, and a top surface removal device [70 is disposed roughly above the entrance side to cross the travel path 3 and remove dust etc. from the top surface of the workpiece W. It is set up.

Next, to explain each of these de-dusting devices M10.50.7o, the side dust removal device 10 consists of two left and right traveling bases 12.
12 and a group of dust removal nozzle units 4o arranged on these, the traveling base 12 equipped with wheels 13 is arranged on the base 5 of the booth 1 along the rail 11. It is configured to run back and forth using a cylinder 15 provided therein.

That is, the running base 12 is provided with a traction bracket 14.14 on its lower surface, and the cylinder 15 is made to run on a sill 19 on which a roller shaft 8 with a sprocket wheel 17 is separately provided by means of its rod 16. From the traction bracket 14 at the rear, the sprocket wheel 21 at the exit side of the booth 1, and the sprocket wheel 17 at the end of the rod 16 to the traction bracket 22 at the exit side of the booth 1. Connect the other chain 2o from the traction bracket 14 in front of the base 12 to the sprocket wheel 24 and rod 16 on the artificial side of the booth 1.
The traveling base 12 is configured to be driven by the cylinder 15 and travel on the rail 11 by being suspended from each traction bracket 25 fixed to the cylinder 15 via the sprocket wheel 17 at the end.

A round bar-shaped support rod 28 is vertically supported on the traveling base 12 by four pillars 27 erected on its upper surface, and a required number of dust removal nozzle units 40 are mounted here.
. . . are a support pipe 30, a horizontal rod 32, which will be described later, respectively.
It is attached using a cross-shaped joint 33 so that the position M can be adjusted in the vertical direction, left-right direction, and front-back direction.

FIG. 1 shows the details of this dust removal nozzle unit 40. The support tube 30, which is slidably attached so that it can be fixed at an appropriate position on the support rod 28 with a set screw 31, has a A horizontal rod 32 extending in the running direction is fixed, and one pipe 34 of a cruciform joint 33 is fitted into the horizontal rod 32 so as to be slidable laterally so that it can be positioned with a set screw 35. A sliding rod 38 having a dust removal nozzle unit 40 at its tip is inserted into the other tube 36 integral with the workpiece W so as to be slidable back and forth toward the workpiece W so as to be positioned by a set screw 37.

On the other hand, an air supply pipe 41 is connected to an air supply port provided on the negative side of the sludge removal nozzle unit 40 attached to the tip of the sliding rod 38, and an air supply pipe 41 is connected to the air supply pipe 41 from an air supply source 42 via a flow rate adjustment valve 43. The pressurized air supplied to the
A corona discharge electrode 46 is provided at the axial center of this nozzle 45, and the electrode 46 is connected to an AC power source 48 via a step-up transformer 47. It is connected.

On the other hand, the front and rear dust removal devices [50, 50] are movably mounted on rails 51 and 51 stretched above each of the entrance and exit sides of the dust removal booth 1. That is,
As shown in FIG. 3, the traveling base 52 that runs on these rails 51 with wheels 53 is provided with a retaining portion 54 on its upper surface, where the retaining portion 54 is provided between the rails 51 and 51. The operating plate 56 of the provided rod cylinder 55 is engaged. A round bar-shaped support rod 58 is vertically installed on the traveling base 52 by a support plate 57 hanging down from the lower surface thereof, and a plurality of dust removal nozzle units similar to those described in the side dust removal device 110 are installed here. 60... are each mounted so as to be adjustable in position in the vertical direction, left-right direction, and front-rear direction by means of a support pipe, a horizontal rod, a cross-shaped joint, and a sliding rod (not shown).

On the other hand, the top dust removal device 170 is installed at the upper part of the entrance side of the dust removal booth 1, and its lower end is connected to the air blowing slit plate 6.
A support rod 71. is suspended from this part so as to be located below the
71, one or several air supply pipes 72, 72 communicating with an air supply source (not shown) are stretched so as to be perpendicular to the travel path 3, and these are connected to the side dust remover tIO described above. A plurality of dust removal nozzle units 75 similar to the dust removal nozzle unit 40 are mounted downward at equal intervals.

In addition, the symbols 8o and 8o in the figure are the opening/closing doors provided at the entrance and exit of the dust removal booth 1, and as shown in FIGS. It is attached to guide rails 81 and 81 provided on both sides so as to be movable up and down, and is connected via a wire 82 to the end of a rod 84 of a cylinder 83 provided on one side of the booth.
Also, the reference numeral 7.7 in FIG. The air sent from the swash plate 7.7 flows down into the booth 1 through the air blowing slint plate 6, and then flows through the dot 9 provided at the bottom of the booth 1. It is configured to be discharged to the outside via an exhaust duct (not shown).

In the device configured as described above, when the trolley 2 supporting the workpiece W is driven by the conveyor below and enters the dust removal booth 1 from the open entrance, the top surface of the workpiece W is Dust and the like adhering to the top surface of the booth 1 are removed by air from a dust removal nozzle unit 75 disposed above the booth 1.

In this way, when the trolley 2 reaches the normal position of the dust removal booth 1 and is positioned there, the side dust removal units M1o and 10 located on both sides of the travel path 3 are closed as the entrance side opening/closing door 80 is closed. While running from the left end to the right end, its support rod 28
Air is blown onto the side surface of the workpiece W on the trolley 2 from a plurality of dust removal nozzle units 40 provided on the carriage 2.

By the way, as mentioned above, in the dust removal nozzle unit 4o, the corona discharge electrode 46 connected to the AC power supply 48 via the step-up transformer 47 is arranged at the axial center of the grounded nozzle 45, so the flow rate adjustment valve 43, the air is ionized while passing through the darkness between the corona discharge electrode 46 and the grounded nozzle 45, that is, the area where the alternating current electric field acts, and becomes particles with the required charge. The air blows out from the nozzle 45 toward the side of the workpiece W, and as it flows along the surface to every corner, it mechanically wipes away dust, etc. adhering to it, and also removes any dust that comes into contact with other objects or the airflow. The electric charge on the surface of the workpiece W accumulated on the pole is neutralized, and at the same time, the electrostatically attached dust is completely removed.

The above dust removal operation is also performed by the front and rear surface removal equipment M50 which has started operating together with the side dust removal device 110.
In addition, the dust that has risen inside the booth 1 due to this series of dust removal operations is sequentially swept away to the bit 9 on the bottom of the booth 1 by the air flowing into the booth 1 from the upper filter 8 while being contracted by the swash plate 7.7. The gas is discharged to the outside from an exhaust duct (not shown).

By the way, some of the dust that has risen due to the above-mentioned dust removal process on the side and front and back surfaces will adhere to the surface of the workpiece W again.
0 from the right to the left in the figure, and in the process, operate the dust removal nozzle unit 40 again to remove new dust attached to the workpiece W, and similarly, in the process of returning the front and rear dust removal devices 50. The dust removal nozzle unit 60 is operated to remove dust attached to the surface of the workpiece W.

(Effects) As described above, according to the present invention, the dust removal nozzle unit is a unit in which a corona discharge electrode connected to an AC power source is positioned at the axis of the grounded nozzle.
The positive and negative charged particles generated in the nozzle neutralize the charge on the workpiece surface caused by contact with other objects, regardless of polarity, and the amount of gas discharged from the nozzle. By changing the amount of charge, the amount of charge can be adjusted as appropriate depending on the amount of charge on the workpiece.

Moreover, since the static elimination nozzle unit configured in this way is supported on the base and is moved along the surface of the workpiece, even if the surface of the workpiece is uneven, the charged particles ejected from the nozzle, that is, the gas, It is possible to continuously remove or neutralize dust or static electricity attached to the surface by distributing it to every corner.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a static elimination nozzle unit showing an embodiment of the present invention, Fig. 2 is a side view of a dust removal device equipped with the above unit, Fig. 3 is a front view of the same snow making machine, and Fig. 4 is a booth. It is a figure showing the structure of the entrance and exit of. ... Dust removal booth 2 ... Trolley 0 ...
... Side dust removal and snow making 12 ... Traveling base 016
o, 75...Dust removal nozzle unit 0...Front and rear dust removal device M 52...Traveling base 0...Top dust removal device Fig. 1

Claims (1)

[Claims] A grounded nozzle for discharging gas from a supply source toward the surface of the workpiece is mounted on a base installed in the booth so as to be able to travel along the surface of the workpiece, and a nozzle at the axial center of the nozzle is installed. A dust removal device equipped with a dust removal nozzle unit equipped with a corona discharge electrode connected to an AC power source.