JPH0343993A - Static electricity removal device - Google Patents

Abstract

PURPOSE:To dispense with rearrangement of the basic constitution of the whole device even when the shape, size and desired treatment capacity of a static electricity removal object are changed and operate always with the highest operation efficiency by controlling blowoff of charged air from a plurality of charged air blowoff units mounted on the encircling wirings by only operating a control means. CONSTITUTION:A plurality of charged air blowoff units 1 are mounted on the encircling wirings 15A, 15B arranged so as to encircle the charged surface of a static electricity removal object A. The actuation number and a blowoff amount of the charged air can be adjusted so as to most conform to the shape, size and desired static electricity treatment capacity of various static electricity removal objects A by only operating the control means 14, 18. Thereby, even when the kind of the static electricity removal object A is variously changed, the actuation efficiency can be always maintained at a high level while requiring no change of the whole constitution of the static electricity removal system.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention aims to eliminate static electricity generated on the surface of a plastic container during injection molding or transportation by using ionized air. The present invention relates to a static eliminator configured to neutralize static electricity by spraying.

(Prior art) Static electricity is generated in various plastics during the molding process and during transportation, but if this charged state is left unattended,
Charged floating dust particles in the air are attracted to the surface of processed products and become dirty, and in the case of plastic films, there is a problem in that the films are attracted to each other.

In addition, when transferring various powders, there is a possibility of a dust explosion due to the static electricity generated, or an IC
During the manufacture of circuit boards, small amounts of dust adhere to them and cause problems such as short circuits, so measures to eliminate static electricity have been an important technical issue for related industries.

Therefore, in the field of plastic molding, for example, fl [air removal equipment] is used, which neutralizes the surface charge by spraying compressed air in which positive and negative ions are generated by alternating current corona discharge onto a statically charged product. I came.

The general configuration of this type of conventional device is as shown in FIG. The ionized air is ionized into positive and negative ions depending on the time, and the ionized air is blown from the air outlet 42 onto the object to be removed from static electricity.

(Problems to be Solved by the Invention) However, in the conventional system, the static electricity removal system described above is different depending on the shape and size of the object to be removed, the required static electricity removal processing capacity, etc. Changing the type of static electricity eliminator, the number of devices used, their arrangement, etc. required time-consuming and complicated work.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a static electricity removal device that is highly versatile and easy to use, and does not require a change in the overall configuration of the device even if the shape and dimensions of the object to be removed, the required static electricity removal processing capacity, etc. change. There is something to do.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the static electricity removing device according to the present invention has the following features: A plurality of charged air blowing units 1 configured to include ion generators that ionize air into positive and negative ions; A compressor 0.11 that supplies compressed air to the plurality of charged air blowing units 1; control means 14 for controlling the supply of compressed air to each of the charged air blowing units 1; surrounding piping 15A, 15B that is arranged so as to surround the charged surface of the object A to be static electricity removed, and that connects the plurality of charged air blowing units 1 detachably in an arbitrary arrangement; and the surrounding piping 15A. , 15B to said compressor 10.1
1, and an air supply pipe 12 connected to the air supply pipe 1.

(Function) The plurality of charged air blowing units 1 attached to the surrounding pipes 15A and 15B arranged so as to surround the charged surface of the object to be static electricity removed can be operated simply by operating the control means 14, 18, etc. The number of actuated objects and the amount of charged air blown out can be adjusted to best suit the shapes and dimensions of various static electricity removal objects A and the desired static electricity removal ability.

Therefore, even if the types of static electricity removal objects are varied, the operating efficiency of the static electricity removal system can always be maintained at a high level without changing the overall configuration of the static electricity removal system.

(Example) Hereinafter, an example in which the present invention is applied to the case of removing static electricity from a plastic beer bottle container as an object for static electricity removal will be described with reference to FIGS. 1 and 2. explain.

First, in Fig. 2, 1 is a charged air blowing unit;
An AC corona discharge device (not shown) is housed inside a substantially cylindrical airtight case 2 of a predetermined length to form a main body. 3 is a compressed air inlet provided on the back of case 2, and 4 is an outlet provided on the front of case 2. The introduced compressed air is passed through an AC corona discharge device, ionized into positive and negative ions, and ionized. The air is blown out from the air outlet 4 as wind.

A plurality of types of charged air blowing units 1 are prepared, each having a case 2 of different length and thickness, and having a different amount of ion air blowing out.

Reference numeral 5 denotes a high voltage generator for discharge, which is connected to a 100V AC commercial power source, and the generated high voltage current is supplied to the AC corona discharge device via a cable 6 and its connecting terminal 1.

Next, in FIG. 1 showing the overall configuration of the apparatus, numerals 8 and 9 are two conveyors connected in a letter-shaped manner when viewed from above. A plastic beer bottle delivery container A is transported on the conveyors 8 and 9 in the direction indicated by the arrow in the figure.

In this case, the static electricity eliminator is designed to be able to remove static electricity from three types of containers A: large, medium, and small. Among these, the dimensions of large container A for large bottles are 45cm (length)
x 29 cm (width) x 35 cm (height). Static electricity reaching a maximum of several thousand volts is generated on the surface of this plastic container A during injection molding.

10 and 11 are the first and second compressors, respectively, and in this case, the capacity of the first compressor 11 is 37K.
W, the capacity of the second compressor 11 is 22 KW, and the supply air pressure is both 4 to 4,5 Kg/Cll12G
It is.

Reference numeral 12 denotes an air supply pipe that supplies compressed air discharged from both compressors 1G and 11 to each charged air blowing unit 1. Both ends of this air supply pipe 12 are branched into two hands, respectively. Compressors 10 and 1 are installed in the branch piping on the end side.
1 are connected in parallel.

A valve 13, a pressure regulator 14 as compressed air supply control means, and a check valve (not shown) are connected to each of the proximal branch pipes.

Reference numerals 15A and 15B denote first and second surrounding pipes that are arranged to surround the charged surface of the object to be static electricity removed, and in this case, they each have a generally open-open configuration. Both vertical portions 15. of the surrounding piping 15A, 15B. ．． 15a and the upper horizontal portion 15b are opposed in parallel to both side surfaces (both side surfaces in the traveling direction of the conveyor 8.9) and the top and bottom surfaces of the container A on the conveyors 8 and 9, respectively, and surround the charged surface of the container A. It looks like it will.

16 is the first. The second surrounding pipes 15A and 15B are connected to each pipe end of the distal side branch pipes through pipe joints provided at one location each.

17 is each vertical part 15a, 1 of surrounding piping 15A, 15B
5a and the upper horizontal portion 15b so as to protrude so as to face the charged surface of the container A, and in this case, as shown in the figure, they are provided at a total of six locations at predetermined intervals.

Each of these branch pipes 11 is provided with a valve 18 as an air supply control means, and a pipe joint is provided at each pipe end to connect the compressed air inlet 3 of each charged air blowing unit 1. I try to let it happen.

Although the high voltage generator 5 is not shown in FIG. 1, in this embodiment, the high voltage generated by one high voltage generator 5 is transmitted to two or more charged air blowing units 1. The distributed supply simplifies the overall configuration of the device.

Reference numerals 19 to 21 indicate dust removal filters having different mesh sizes, and the mesh sizes are 0.01μ, 1μ, and 5μ. 22 is an oil-water separator that collects oil-containing condensed water generated from compressor 0.11 and collects oil. The water that has been purified by removing oil is discharged into a sewage ditch (not shown).

Next, the operation of the above configuration will be explained.

Plastic containers A, the surfaces of which are strongly charged during injection molding, are sequentially supplied to one end of the conveyor 8 (the right end in FIG. 1).

In this case, the container A with the largest size among the three types of containers A described above is supplied.

Therefore, it is decided that the two 0.11 compressors and all six charged air blowing units 1 will be activated. Then, the compressed air is delivered to the air supply piping 12 with the optimum air pressure and air supply amount determined in advance based on experience.
The pressure regulators 14 are operated respectively. 1st. The valves 18 of each branch pipe 17 of the second surrounding pipes 15A and 15B are all left open.

In this example, fl to the 10th surrounding piping 15A (supply air pressure is 2.5 kg/cm2G, and the second surrounding piping 15B is
The air pressure supplied to the was set to 4.0Kg/cn+2G.

After that, the high voltage generator 5 (not shown) is energized, the two compressors 10 and 11 are activated, and the supply of the container A onto the container 8 is started. When passing through the square-shaped enclosure of the surrounding piping 15A, it is blown out from the respective air outlets 4 of the six charged air blowing units 1 attached to the first surrounding piping 15A.
Compressed air charged with both positive and negative ions is stored in container A.
sprayed on.

Therefore, as described above, the positive or negative charges generated on the surface of the container A during injection molding are neutralized by negative or positive ions in the compressed air. However, among the charged surfaces of the container A, both the front and rear surfaces in the moving direction of the container A are parallel to the blowing direction of compressed air from each blowout port 4, so the charged air blowing unit 1 In places far from
Sufficient static elimination effect is not achieved. Moreover, since a grid-like partition is provided inside the container A to prevent beer bottles from coming into contact with each other, it is difficult to sufficiently eliminate static electricity from this partition.

Therefore, when the container A whose static electricity has not been sufficiently removed reaches the end of the con-hair 8, it is moved to the starting end of the con-hair 9 that is connected to this end in an L-shape.

Then, the container A transferred on the conveyor 9 is moved to the second
Also when passing through the mouth-shaped inner space of the surrounding piping 15B,
The static electricity removal effect is applied in the same manner as described in Section 2 above.

At this time, charged air is blown onto the two surfaces of the Conhair 8 located at the front and rear sides in the direction of movement, and charged air is blown onto the inner surface of the container A again. Therefore, static electricity can be almost completely eliminated from the entire surface of the container A.

The container A that has been subjected to the static elimination process is sent from the end of the conveyor 9 toward a storage yard (not shown).

When the static elimination effect of container A subjected to static elimination treatment was measured in this manner, the measurement results summarized in Table 1 below were obtained.

This measurement was performed on 15 containers A, and the static electricity voltage at the following three locations a to C of each container A was measured before and after the static electricity removal process, and the average of the 15 containers was calculated. From the value, the static elimination rate (voltage before static elimination - voltage after static elimination/voltage before static elimination) was determined.

a. Long side outer surface center part 1 of container A]: Nol Short side outer side center part c: l No.
Internal Bottom Center Table 1 In this way, it was confirmed that the static electricity eliminator of the above example exhibited extremely excellent static electricity removal performance.

Incidentally, if you hold the charged air blowing unit 1 in your hand and perform the static elimination process, the voltage will still be 0.3 to 0.5 after the process.
It was inevitable that static electricity of 1 (V) would remain.

Next, a small container A with a short length (height 28.5cm)
2. When performing static elimination processing on 1. Second surrounding pipe 15A
, 15B, of the two upper and lower charged air blowing units 1 attached to the vertical parts 15b, 15B, the upper charged air blowing units 1 to 1 are hardly used, so it is difficult to remove them. By closing the valve 18 provided on the wearable branch pipe 11, the load on the compressors io and i1 is reduced accordingly.

Then, the pressure regulator 14 is operated to compress the compressor 10.1.
By controlling the discharge loaf and lobe output from the compressor 1 and, in some cases, stopping one of the compressors, the operating costs of the device can be reduced accordingly.

In this way, according to the above configuration, when it is desired to change the type and processing speed of the container A that is continuously subjected to static neutralization treatment on the conveyor 81, the type and use of the charged air blowing unit is different from the conventional one. There is no need to perform complicated remodeling work to change the number, arrangement, air supply piping, etc., and it is sufficient to simply operate the control means such as the pressure regulator 14 and the valve 18.

Therefore, the time and expense required to change the configuration and performance of the static electricity removal device in response to changes in the type of static electricity removal target, processing amount, etc., can be much reduced compared to conventional devices.

No. 3 I71 shows another embodiment of the present invention, and the difference from the above embodiment lies in the configuration of the surrounding pipe 23.

That is, the main body portion of the surrounding pipe 23 is formed in a downward U-shape, and the upper horizontal portion 23. The shell part of the tube is replaced with a pressure-resistant visible tube 24, one U-shaped leg end is closed, and the other leg is provided with a pipe joint 25. This pipe joint 25 is connected to the air supply pipe 12.

26 is a pair of pedestals for standing up the surrounding piping 23 in a gate shape;
A pipe 29 into which the lower ends of both legs of the surrounding pipe 23 are loosely fitted is erected on a stand 28 to which casters 27 are respectively attached.

3o is a set screw screwed onto the pipe 29, which serves to fix the vertically movable surrounding pipe 23 at an arbitrary height position.

Reference numeral 31 denotes a movable horizontal pipe, the middle part of which is replaced with a pressure-resistant visible pipe 32, and short pipes 33 are vertically welded to both closed ends of the pipe. Both pipes 33 are loosely fitted into both legs of the surrounding pipe 23, and the movable horizontal pipe 31 is fixed at an arbitrary height position by a set screw 34 screwed onto the pipe 33. 35 is the surrounding pipe 23. Upper horizontal portion 23. This is a pressure-resistant flexible tube that communicates with the movable horizontal tube 31.

By configuring the surrounding piping 23 in this way, the distance between the two legs thereof facing each other can be varied as shown by the arrow x, and the distance between the movable horizontal pipe 31 and the conveyors 8 and 9 can also be changed as shown by the arrows y and z. Container A on Conhairt]
Even if the shape and dimensions of the movable horizontal pipe 31 change considerably as shown by the two-dot chain line in the figure, the distance between the opposing legs of the surrounding pipe 23 and the height position of the movable horizontal pipe 31 can be easily and quickly changed.

Therefore, the charged surface of container A and each charged air blowing unit 1
The opposing distance between the air outlet 4 and the air outlet 4 can be easily and quickly adjusted to the optimum value.

Therefore, the loss caused by the charged air blown out from the outlet 4 being diffused in a direction away from the container A is minimized, and the static electricity eliminator can always be operated most efficiently.

In addition, branch pipes 11 of surrounding pipes 15A and 15B may be
The charged air blowing unit 1 attached to the electrified air blowing unit 1 can be easily replaced with one of a different size or type. The operating efficiency of the device can always be maintained at its highest without requiring unnecessary expense and time for rearranging the parts 1 and 1.

In each of the embodiments described above, the surrounding piping is bent into an opening or U-shape, but it may be, for example, an L-shape or any other arbitrary shape.

In addition, the branch pipe 11 is fixed to the surrounding pipes 15A and 1513.23, but if the branch pipe 17 is attached to these surrounding pipes so that it can swing, it is possible to remove static electricity from objects with complicated shapes. Charged air can be blown onto the charged surface most efficiently. Of course, the shapes and structures of the band 6 and the electric air blowing units 1 to 1 are not limited to those shown in the drawings.

[Effects of the Invention] As is clear from the above description, the static electricity removal device of the present invention includes a surrounding pipe that surrounds an object to be removed from static electricity, and a plurality of charged air blowers attached to the surrounding pipe. Since the charged air is blown out from the unit so that it can be controlled as desired by operating the control means, even if the shape and dimensions of the object to be static electricity removed or the desired processing capacity change,
There is no need to change the basic configuration of the entire device, and it is extremely versatile and easy to use, and can always be operated at the highest operating efficiency.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention,
Fig. 1 is a sketch of the apparatus, and Fig. 21 is a perspective view of the Sumoto air blowing unit. FIG. 3 is a front view of main parts showing another embodiment of the present invention. FIG. 4 is a perspective view of a conventional device. Code Table 1 Charged air blowing unit 2 Case 3 Compressed air inlet 4 Outlet 5 High voltage generator 6 Cable 7
Connection terminal 8.9 Conveyor 0.11 Compressor 2 Air supply piping 13 Valve 8 Valve (control means) 4 Pressure regulator (control means) 5A First surrounding piping 5B Second surrounding piping 6.25 Pipe joint 11 Branch pipe 9-21 Dust removal filter 2 Bent water separator 23 Surrounding piping 4.32.35 Pressure-resistant visible pipe 6 Stand part 7 Caster 28 Stand 3.33 Pipe 3 (1, 34 setscrew container (
Static electricity removal target)

Claims (3)

[Claims] (1) Case 2 with compressed air inlet 3 and outlet 4
a plurality of charged air blowing units 1 each containing an ion generator that ionizes the introduced compressed air into positive and negative ions; a compressor 10 that supplies compressed air to the plurality of charged air blowing units 1; 11, control means 14 and 18 for controlling the supply of compressed air to each of the plurality of charged air blowing units 1, and control means 14 and 18 arranged so as to surround the charged surface of the object A to be statically removed, Surrounding piping 15A, 15B to which the charged air blowing unit 1 is removably connected in an arbitrary arrangement; and the surrounding piping 15A, 15B is connected to the compressor 10, 1.
1. A static electricity eliminator comprising an air supply pipe 12 connected to 1. (2) The plurality of charged air blowing units 1 are attached to the surrounding pipes 15A and 15B so that the type, number, and position of the charged air blowing units 1 can be changed according to the shape and dimensions of the object to be removed from static electricity. The static electricity eliminator according to claim 1, characterized in that: (3) a plurality of compressors 10 in the air supply pipe 12;
11, and these compressors 10 and 11.
3. The static electricity eliminator according to claim 1, further comprising a control means (14) for individually controlling the operation of the static electricity eliminator.