JPH0298098A - Static eliminator - Google Patents

Abstract

PURPOSE:To make it possible to lengthen static elimination distance and shorten elimination period and carry out static elimination of an object easily and efficiently by transporting ions generated in an ion generating part to an object for static elimination with a wind whose flow rate is elevated by a blowing part and an adapter part. CONSTITUTION:A fan 5 and a heater 7 are installed in a blowing duct 4 to form a blowing part 1 to blow warm wind. A blowing adaptor 2 increases the flow speed of a wind from the blowing part 1 by its taper shape of a narrowed tip. Two needle-like electrodes are installed in each of two sides in the opposite each other of an insulating frame 10 in an ion generating part 3 and cationic ions and anionic ions are generated by corona discharge. Then the ions are sent forward by a warm wind from the blowing adaptor 2 so as to carry out static elimination of a placed object within a short time. When the system is used for an injection molding apparatus, a molded product is moved with the high wind and ions are injected in a gap between a molding die and the product and static elimination is carried out in high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a static electricity eliminator used to remove static electricity from a charged molded product attached to a mold after injection molding.

[Prior Art] As a static electricity eliminator for removing static electricity from an object charged with static electricity, the one shown in FIG. 5 is conventionally known.

The device shown in this figure includes an ion generating section 101 that alternately generates positive ions and negative ions, a fan 102 provided behind the ion generating section 101, and the ion generating section 1.
The AC high voltage generated by the high voltage generating section 103 is supplied to the ion generating section 101 to alternately generate positive ions and negative ions. While being generated, these positive ions and negative ions are sent forward by the fan 102 to remove static electricity from an object to be neutralized placed in front.

In this case, the ion generating section 102 includes a plurality of insulating cylinders 104 arranged at equal intervals, and each of these insulating cylinders 10.
a plurality of needle-like electrodes 105 provided to penetrate the outer and inner surfaces of the insulating cylinder 1; a connecting wire 106 connecting the electrodes 105 within the insulating cylinder 104;
A plurality of long plate-shaped counter electrodes 107 are arranged so as to face the electrodes 04, and when an AC high voltage is supplied from the high voltage generation section 103, the tip of each needle-shaped electrode 105 and the counter electrode 107 to generate positive ions and negative ions.

Further, as another static electricity removing device, one shown in FIG. 6 is also known.

The device shown in this figure includes an ion generating section 111 that alternately generates positive ions and negative ions, a high pressure air input section 112 that supplies high pressure air to the ion generating section 111, and an AC high voltage applied to the ion generating section 111. High voltage generator 1 that supplies
13, the AC high voltage obtained by the high voltage generation section 113 is supplied to the ion generation section 111 to generate positive ions and negative ions alternately.
These positive ions and negative ions are sent forward by the high-pressure air supplied through 12, and the static electricity of the object to be neutralized placed in front is removed.

In this case, the ion generating section 111 is arranged so as to pass through an insulating cylinder 114 in which a plurality of holes 110 passing through the outer surface and the inner surface are formed, and each member 110 of the insulating cylinder 1]4. a plurality of needle-like electrodes 115, and the insulating cylinder 1.
a connection line 116 connecting each of the electrodes 115 within 14;
A long plate-shaped counter electrode 117 is arranged to face each insulating cylinder 114, and when an AC high voltage is supplied from the high voltage generating section 113, each needle electrode 115 Corona discharge is performed between the tip of the head and the counter electrode 117 to generate positive ions and negative ions, and the high-pressure air supplied through the high-pressure air input section 112 is blown out from each person 110 to generate the positive ions. , sends negative ions forward.

[Problem to be solved by the invention] By the way, in such a conventional static electricity removal device,
There were problems as described below.

First, in the static electricity eliminator shown in FIG. 5, a large number of needle-shaped electrodes 105 are attached to each insulating cylinder 11. It has to be bigger.

However, if the output current value of the high voltage generating section 103 is increased, the high voltage transformer etc. that are included in the high voltage generating section 103 must be made larger, which increases the cost and increases the size. turn into. Furthermore, the greater the current value, the greater the risk of loss of life due to electric shock if a person accidentally touches the needle electrode 105 portion or the like.

Therefore, in such a static electricity eliminator, the output current value of the high voltage generator 103 cannot be made very large, the distance that produces the static electricity removal effect is about 1 m, and the time required for static electricity removal is about 6 to 8 seconds. Become.

Therefore, when this static electricity eliminator is used to eliminate static electricity from injection molded products, there is a problem in that when the molding cycle time of the injection molding machine is short, the performance of the injection molding machine must be reduced by the longer static electricity elimination time. .

Furthermore, in the static electricity eliminator shown in FIG.
Since high-pressure air is blown out from hole 110 to carry positive and negative ions forward, the diameter of hole 110 is approximately 5+n.
It is necessary to prevent the air pressure of the high-pressure air from dropping significantly.

For this reason, the flow of high-pressure air discharged from the hole 110 is disturbed, and a static elimination distance of only about 20 to 30 cm can be secured.

Therefore, when installing this static electricity eliminator in an injection molding machine, it must be placed near the mold, and a work area for attaching and removing the mold, taking out molded products, and various adjustment operations must be provided. There was a problem that it became difficult to secure.

In view of the above circumstances, the present invention can lengthen the static electricity removal distance and shorten the static electricity removal time, thereby making it possible to easily and efficiently remove static electricity from injection molded products, etc. The purpose is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, a static electricity removing device according to the present invention includes: a blowing section that generates wind; an ion generating section that generates ions by corona discharge; The present invention is characterized by comprising an air blowing adapter section that narrows the flow diameter of the generated air to increase the flow velocity, and supplies the air to the ion generation section, thereby transporting the ions generated by the ion generation section to the object to be neutralized.

[Operation] In the above configuration, when air is generated by the air blower, the air blower adapter increases the flow rate of this air and supplies it to the ion generator, and the ions generated by the ion generator are delivered to the object to be neutralized. Have it transported.

[Embodiment] FIG. 1 is a side view showing an embodiment of the static electricity removing device according to the present invention.

The static electricity removal device shown in this figure includes a blower section 1 that generates warm air, an ion generator section 3 that generates positive ions and negative ions, and a diameter (flow diameter) of the warm air obtained by the blower section 1. It is equipped with an air blowing adapter section 2 that narrows down and supplies the positive ions and negative ions generated by the ion generating section 3 to the ion generating section 3, and sends the positive ions and negative ions generated by the ion generating section 3 forward. The generated AC high voltage is supplied to the ion generating section 3 to generate positive ions and negative ions alternately, while the hot air squeezed by the blower adapter section 2 sends these positive ions and negative ions forward and arranges them in the front. Removes static electricity from the object to be neutralized.

The air blower 1 includes a cylindrical air duct 4, a fan 5 disposed in the air duct 4, a motor 6 that rotates the fan 5, and a motor 6 that rotates the fan 5.
The heater 7 warms the air generated when the motor 5 and the heater 7 are rotated, and when power is supplied to the motor 5 and the heater 7, it generates hot air and supplies it to the rear end side of the air blower adapter part 2. .

The air blowing adapter part 2 has a taper formed on the inner surface side so that the tip side becomes narrower, and the hot air supplied from the air blowing part is narrowed by the air blowing adapter part 2 and blown out from the tip, and the ion generating part is generated. 3.

In this case, the inner diameter cross-sectional area of the rear end side of the air blower adapter part 2 is S
In addition, since the inner diameter cross-sectional area on the tip side is set to 82, if hot air with a flow velocity vI is supplied to the rear end of the blower adapter part 2, this blower adapter Warm air with a flow velocity v2 is blown out from the tip of part 2.

However, ρI: fluid density of hot air supplied to the rear end side of the air blower adapter section 2.

ρ2: Fluid density of hot air blown out from the tip side of the air blowing adapter part 2.

Now, since the fluid density ρ of the hot air supplied to the rear end side of the air blowing adapter part 2 and the fluid density ρ2 of the hot air blown out from this air blowing adapter part 2 are almost the same, the above ( 1) The formula is as follows.

In other words, the flow velocity of the hot air supplied to the rear end side of the air blower adapter section 2 increases in accordance with the ratio of the inner diameter cross-sectional area S1 on the rear end side of the air blower adapter section 2 and the inner diameter cross-sectional area S2 on the front end side. It is blown out from the tip side.

The ion generating unit 3 also includes an insulating frame 10 formed in the shape of a mouth as shown in FIG. 2, two needle electrodes 11 attached to one side of this frame 10, and these two It is equipped with two needle-like electrodes 12 attached to the other side of the frame 10 in a direction facing the needle-like electrode 11, and when an AC high voltage is supplied from the high voltage generating section, each needle-like electrode 11-
12 to generate positive ions and negative ions. Then, the positive ions and negative ions are sent forward by the warm air supplied from the air blowing adapter section 2 at a flow rate v2, thereby removing static electricity from the object to be neutralized placed in front.

In this embodiment, as shown in FIG. Even if the distance from the object 15 is about 2 m, a sufficient static elimination effect can be obtained in about 1.6 seconds as shown in FIG.

In addition, when this static electricity eliminator is used to remove static electricity from molded products molded by an injection molding machine, the hot air flows at a high speed, so the molded product that is electrostatically attracted to the mold is moved by this warm air. As a result, a gap is created between the molded product and the mold, and positive ions and negative ions can enter this gap to further enhance the static elimination effect.

In addition, since the positive ions and negative ions generated by the ion generating section 3 can be efficiently transported, the output current value of the high voltage generating section can be reduced, thereby reducing the cost and size of the device. can be achieved.

In addition, since the flow rate of hot air is increased by the air blowing adapter part 2 and is supplied to the ion generating part 3, the pressure between the needle electrodes 11 and 12 of the ion generating part 3 can be made lower than atmospheric pressure. .

As a result, corona discharge can be easily generated between the needle electrodes 11 and 12, and the amount of positive ions and negative ions generated can be increased, and this can be prevented from being diffused to the surroundings to reach the object to be neutralized. Can be transported.

Furthermore, in the above-described embodiment, the heater 7 is disposed within the blower section 1 to warm the air generated by the fan 5, so that the mold is not adversely affected when static electricity is removed from the injection molded product. It can be done.

Furthermore, in the above-mentioned embodiments, the present invention was explained by taking the case of eliminating static electricity from injection molded products as an example, but the present invention can also be applied to paper manufacturing, food packaging materials, liquid, powder manufacturing processes, etc. Of course, it is possible to use a static electricity eliminator according to the above.

[Effects of the Invention] As explained above, according to the present invention, it is possible to lengthen the static electricity removal distance and shorten the static electricity removal time, thereby making it possible to easily and efficiently remove static electricity from injection molded products, etc. can be done.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the static electricity eliminator according to the present invention, FIG. 2 is a front view of the ion generating section shown in FIG. 1, and FIG. 3 is a side view showing an example of application of the same embodiment. , Fig. 4 is a table for explaining the effect of the application example shown in Fig. 3, Fig. 5 is a front view showing an example of a conventional static electricity eliminator, and Fig. 6 is a diagram of a conventional static electricity eliminator. It is a front view which shows another example. 1...Blower section, 2...Blower adapter section, 3...Ion generation section.

Claims (2)

[Claims] (1) A blowing section that generates wind, an ion generating section that generates ions by corona discharge, and a flow diameter of the air obtained by the blowing section being narrowed down to increase the flow velocity to the ion generating section. What is claimed is: 1. A static electricity eliminator comprising: a blower adapter section that supplies and transports ions generated by the ion generating section to an object to be neutralized. (2) The static electricity eliminator according to claim 1, wherein the air blower generates air at a preset temperature.