JP5794584B2 - Charged body static elimination device and charged body static elimination method using the same - Google Patents

Description

  The present invention relates to a charged body neutralizing device and a charged body neutralizing method using the same.

  In many cases, a resin molded product molded by a resin molding apparatus is charged by static electricity generated by contact with an article made of another material. When the resin molded product in the charged state is to be transported by a transport robot or the like, the resin molded product adheres to the arm (chuck part) of the transport robot due to the action of static electricity and cannot be separated from the arm. In some cases, there was a problem in handling resin molded products.

In order to solve such a problem, a configuration related to an apparatus for performing static elimination processing on a static elimination target object by spraying air ions on the static elimination target object in a charged state and neutralizing static electricity of the static elimination object with air ions However, it is proposed in Patent Document 1, for example.
According to the static eliminator disclosed in Patent Document 1, since the static electricity of the resin molded product is removed, the resin molded product and the arm of the transfer robot can be reliably separated from each other. It has become possible to accurately handle.
As another static eliminating device, a self-discharge type device using a so-called static eliminating brush as a discharge electrode is also known.

JP 2010-277931 A

However, when performing the static elimination process by spraying air ions on a charged body as disclosed in Patent Document 1, it takes a movement time until the air ions adhere to the charged body. In addition, it is necessary to have a blower configuration to release air ions, a large amount of ozone is generated when air ions are generated, and air ions attached to the charge removal object are subject to static elimination There is a problem such as being away from the object and being charged again.
In addition, the static eliminator adopting the self-discharge method can perform the static eliminating process at a high speed, but there is a problem that the static eliminating effect can be obtained only when the discharge electrode and the static eliminator are in close proximity.

  Accordingly, the present invention provides a charged body static eliminator that makes it possible to neutralize a charged body by generating corona discharge and consuming electrostatic energy possessed by the charged body, and this charged body static eliminator. The object is to provide a method for eliminating the charged body used.

In order to solve the above problems, the present inventor has intensively studied, and as a result, has come up with the following configuration.
That is, a power supply device, and a positive electrode and a negative electrode electrically connected to the power supply device and arranged in parallel at a necessary interval, the positive electrode and the negative electrode are the positive electrode and the negative electrode The corona discharge starting voltage is formed by linear bodies that are equal to each other, and the voltage supplied to the positive electrode and the negative electrode is maintained to be equal to or higher than the voltage immediately before the corona discharge starting voltage in the positive electrode and the negative electrode , By passing the charged body between the positive electrode and the negative electrode, corona discharge is generated in the charged body, the positive electrode, and the negative electrode, and the electrostatic energy of the charged body is released by the release of heat and electromagnetic waves in the corona discharge. The charged body static eliminator is characterized in that the charged body is neutralized by consuming .

According to this configuration, when the charged body passes between the positive electrode and the negative electrode, corona discharge is instantaneously generated between the charged body and the positive electrode or the negative electrode, mainly on the surface of the positive electrode or the negative electrode. Since the electrostatic energy of the charged body is consumed by the release of heat and electromagnetic waves (light) in corona discharge, the charged body can be neutralized in an instant.
In addition, the charged body neutralizing device does not require a structure such as a blower, and the configuration of the charged body neutralizing apparatus can be simplified.
Furthermore, since the corona discharge is performed only when the charged body passes between the positive electrode and the negative electrode, the generation amount of ozone can be reduced as much as possible by intermittently generating the corona discharge. it can.
Furthermore, since the charge removal process of the charged body does not use the attachment of air ions, there is no possibility of being charged again after the charge removal process.

  Further, this configuration can be regarded as a method in which a voltage is applied to the electrode in the self-discharge method. In the self-discharge method, the electrode is usually connected to ground, but instead, by applying a voltage, the potential difference between the electrode and the charged body is expanded, and a corona discharge that protrudes with a large amount of heat and electromagnetic wave (light) emission Can be promoted. As a result, even when the distance between the electrode and the charged body is longer than that in the self-discharge method (even if the electrode and the charged body are not in a very close state), a protruding corona discharge is generated, and a static elimination effect is obtained. It is convenient because it can.

In addition, the said linear body in at least one of the previous SL positive electrode or the negative electrode, it is good preferable that projecting member projecting toward the other pole side is at least one arranged. By adopting this configuration, between the strip conductor and the positive or negative electrode mainly the occurrence of corona discharge on the surface of the positive or negative electrode is promoted, it is possible to charge elimination more efficient charging member This is convenient because the voltage applied to the positive electrode and the negative electrode can be reduced.

Further, the positive electrode and the negative electrode are electrically connected to the power supply device through current limiting resistors, respectively, and the current limiting resistor reduces the amount of current supplied to the positive electrode and the negative electrode. It is preferable to prevent the protruding corona discharge on the surface of the positive electrode or the negative electrode from becoming continuous and to minimize the amount of ozone generated . By adopting this configuration, the projecting corona discharge between the charged body and the positive electrode or the negative electrode, mainly on the surface of the positive electrode or the negative electrode, is prevented from being continued, and wasteful power consumption is suppressed. It is possible to provide a safe charged body static eliminator that minimizes the occurrence of the above.
Moreover, since generation | occurrence | production of ozone is suppressed, it is relieved from the need to adjust the voltage to apply so that it may become a voltage immediately before a corona discharge start voltage, and it becomes possible to make a voltage high according to a static elimination effect.

Further, as another invention, there is provided a charged body discharging method using the charged body discharging device according to any one of the above, wherein the charged body is passed by passing the charged body between a positive electrode and a negative electrode, There is also provided a charged body discharging method characterized in that the charged body is discharged by causing corona discharge in the positive electrode and the negative electrode and consuming electrostatic energy of the charged body by releasing heat and electromagnetic waves in the corona discharge. is there. Accordingly, if the charged body is passed between the positive electrode and the negative electrode, corona discharge can be generated between the charged body and the positive electrode or the negative electrode due to the electrostatic energy of the charged body. The electrostatic energy of the charged body is consumed, so that the charged body can be neutralized.

  Further, when the charged body is passed between the positive electrode and the negative electrode, the charged body is changed between the positive electrode and the positive electrode depending on whether the charged body is in a positive charged state or a negative charged state. It is preferable to pass through in a state of being closer to the negative electrode or the positive electrode than the intermediate position with respect to the negative electrode. Thereby, it can be in the state where corona discharge between the charged body and the positive electrode or the negative electrode is more likely to occur, and the charge body can be efficiently neutralized.

According to the configuration of the charged body neutralizing device and the charged body neutralizing method using the same according to the present invention, when the charged body is passed between the positive electrode and the negative electrode, between the charged body and the positive electrode or the negative electrode, mainly the positive electrode Alternatively, the corona discharge is instantaneously generated on the surface of the negative electrode, and the electrostatic energy of the charged body is consumed by the release of heat and electromagnetic waves (light) in the corona discharge. Therefore, a charged body static eliminator that functions at high speed can be provided.
Moreover, the structure of a ventilation part etc. becomes unnecessary and the structure of a charged body static elimination apparatus can be simplified. Further, since the protruding corona discharge is performed only when the charged body is passed between the positive electrode and the negative electrode, the protruding corona discharge accompanied by the generation of ozone is intermittently performed. The amount generated can be reduced as much as possible.
Furthermore, since the charge removal process of the charged body does not use the attachment of air ions, there is no possibility of being charged again after the charge removal process.
That is, the charged body can be quickly neutralized, and problems associated with the generation of ozone when the charged body is neutralized can be reduced.

It is a schematic block diagram of the charged body static elimination apparatus in 1st Embodiment. It is an enlarged view which shows the modification of the linear body which comprises the negative electrode in 2nd Embodiment. It is a schematic block diagram of the charged body static elimination apparatus in 3rd Embodiment. It is a top view of the electrode part in the charged body static elimination apparatus shown in FIG.

  Hereinafter, the charged body static elimination apparatus according to the present invention will be described based on the embodiments.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a charged body neutralizing device in the first embodiment.
The charged body neutralizing device 10 according to the present embodiment is provided with a power source device 20 and a positive electrode 30 and a negative electrode 40 that are linear bodies arranged in parallel with a predetermined interval. Each of the positive electrode 30 and the negative electrode 40 is electrically connected to the power supply device 20. Further, the separation distance between the positive electrode 30 and the negative electrode 40 can be appropriately set according to the size of the charging body T to be subjected to the charge removal process or the charging body T and the transporting means (not shown) for transporting the charging body T.

As shown in FIG. 1, the power supply device 20 according to the present embodiment includes a power supply unit 22, a control circuit 24, a piezoelectric transformer 26, and a DC voltage amplification circuit 28 that are electrically connected in the order described. It is configured.
In addition, the power supply device 20 is not limited to the structure shown in this embodiment, The structure of the power supply device 20 which combined the other well-known structural element suitably can also be employ | adopted.

  In the present embodiment, a commercial power source is used as the power supply unit 22. The AC 100 volt or AC 200 volt supplied from the power supply unit 22 is first converted to 12 VDC by a control circuit 24 represented by a converter, and then a pulsed voltage signal having an arbitrary peak value by a boost chopper circuit. Is converted to The pulsed voltage signal having an arbitrary peak value generated by the control circuit 24 is then boosted to a maximum of AC 2 kilovolts by the piezoelectric transformer 26. Subsequently, the maximum AC voltage of 2 kilovolts is subjected to AC / DC conversion and boosting processing by a DC voltage amplification circuit 28 typified by the Cockcroft-Walton circuit, and finally generated into a positive voltage and a negative voltage of maximum DC 20 kilovolts. .

  A positive voltage having a maximum DC of 20 kilovolts thus generated is applied (supplied) to the positive electrode 30 and a negative voltage having a maximum DC of 20 kilovolts is applied to the negative electrode 40. The applied voltage to the positive electrode 30 and the negative electrode 40 of the charged body neutralizing device 10 in this embodiment is maintained so that the absolute value of each applied voltage is equal to or greater than the absolute value of the voltage immediately before the corona discharge start voltage. Note that it is convenient to apply a voltage having the same absolute value to the positive electrode 30 and the negative electrode 40 because the electric field forming region is limited between the positive electrode 30 and the negative electrode 40. Further, as compared with the case where the charged body neutralizing device 10 is configured by only the positive electrode 30 or the negative electrode 40, it is advantageous in that the neutralization process can be performed regardless of whether the charged body T is positively or negatively charged.

  Here, the corona discharge start voltage refers to the voltage applied to the electrode when corona discharge is started. Corona discharge is a phenomenon in which the atmosphere is turned into plasma when the density of electric lines of force generated in an electric field reaches a certain level or more and the electric field becomes stronger. A region where the density of electric lines of force is high is expressed as a strong electric field, and corona discharge occurs in a region where the electric field is strong. The voltage immediately before the corona discharge start voltage refers to a voltage at which corona discharge is immediately started when the density of the lines of electric force increases even slightly due to the approach of the charged body T or the like.

  In the present embodiment, both the positive electrode 30 and the negative electrode 40 are formed of a linear conductor. When the voltage applied to the positive electrode 30 or the negative electrode 40 is equal to or higher than the corona discharge start voltage, corona discharge occurs even if the charged body T does not pass through, and the amount of ozone generated from the positive electrode 30 and the negative electrode 40 increases with increasing voltage. It is dangerous because it increases. Therefore, in order to suppress corona discharge, a current limiting resistor 50 of 1 gigaohm is provided between the DC voltage amplifier circuit 28 and the positive electrode 30 and the negative electrode 40 as shown in FIG. The amount of current supplied to is reduced.

  By the way, in the positive electrode 30 and the negative electrode 40 to which voltages having the same absolute value are applied, the negative electrode 40 is more likely to generate corona discharge than the positive electrode 30. In order to equalize the conditions for starting corona discharge between the positive electrode 30 and the negative electrode 40 to which voltages having the same absolute value are applied, the electric field at the positive electrode 30 is set to be stronger than the electric field at the negative electrode 40. Good. In the present embodiment, the shapes of the linear body constituting the positive electrode 30 and the linear body constituting the negative electrode 40 are made different so that the positive electrode 30 and the negative electrode 40 can be obtained even when the absolute values of the applied voltages are equal. The conditions for starting the corona discharge are set to be equal to each other.

As a method for making the conditions for starting corona discharge between the positive electrode 30 and the negative electrode 40 equal to each other, in addition to changing the shape of the linear bodies of the positive electrode 30 and the negative electrode 40, the positive electrode 30 and the negative electrode 40 are formed. The diameters of the linear bodies may be different. As a result of the experiment, if the diameter of the linear body forming the positive electrode 30 is set to 1/2 to 1/3 of the diameter of the linear body forming the negative electrode 40, corona discharge in the positive electrode 30 and the negative electrode 40 is caused. The conditions for starting can be made equal.
Furthermore, it is also possible to make both the diameter and shape of the linear bodies forming the positive electrode 30 and the negative electrode 40 different from each other.

  The positive electrode 30 and the negative electrode 40 are maintained in a state where a voltage equal to or higher than the voltage just before the corona discharge start voltage is applied to both. When the charged body T is passed between the positive electrode 30 and the negative electrode 40 in a state where a voltage equal to or higher than the voltage immediately before the corona discharge starting voltage is applied in this way, the charged body T and the positive electrode 30 or the charged body. The density of electric lines of force increases between one of T and the negative electrode 40 to cause a corona discharge that protrudes, and the electrostatic energy of the charged body T is consumed. The area where the density of the electric lines of force increases and the corona discharge that protrudes is generated mainly on the surface of the positive electrode 30 or the negative electrode 40, but when the charged body T has a protruding portion, Such corona discharge also occurs on the surface.

  According to the configuration of the charged body neutralizing device 10 in the present embodiment, the charged body T can be passed between the positive electrode 30 and the negative electrode 40 which are maintained in a state where a voltage equal to or higher than the voltage just before the corona discharge start voltage is applied. For example, since the change in the electric field between the two propagates at the speed of light, even if the charged body T is passed between the positive electrode 30 and the negative electrode 40 at a high speed, a protruding corona discharge is generated. In terms of being able to reliably remove the charge from the charged body T, the usability is very good as compared with the charged body charge removal apparatus according to the prior art.

  In addition, although the positive electrode 30 and the negative electrode 40 are applied with a voltage equal to or higher than the voltage just before the corona discharge start voltage, the corona discharge that protrudes only when passing the charged body T is generated. The protruding corona discharge at the time of static elimination treatment is intermittently generated, and the amount of ozone generated due to the protruding corona discharge can be minimized. Therefore, it is advantageous in that the adverse effect of ozone on the surrounding environment of the charged body neutralizing device 10 can be reduced.

(Second Embodiment)
FIG. 2 is an enlarged front view showing a modified example of the negative electrode. The present embodiment is characterized in that a protruding body 42 protruding toward the positive electrode 30 is disposed on the surface of the linear body forming the negative electrode 40. Since other configurations can be the same as those of the first embodiment, detailed description thereof is omitted here.
By providing such a projecting body 42, corona discharge between the negative electrode 40 and the charged body T can be easily generated. As shown in FIG. 2, a plurality of protruding bodies 42 are arranged at a predetermined interval along the extending direction of the negative electrode 40 (linear body), but only one protruding body 42 is provided. It may be.

The protruding body 42 disposed on the surface of the negative electrode 40 may be formed in a columnar body as shown in FIG. 2A, or may be formed in a conical body as shown in FIG. Good. The projecting body 42 formed in the cone shape is more likely to generate corona discharge than the projecting body 42 formed in the columnar body.
The projecting body 42 is not limited to the form shown in FIGS. 2 (A) and 2 (B). Of course, other forms may be used as long as corona discharge between the negative electrode 40 and the charged body T can be easily generated.

(Third embodiment)
FIG. 3 is a schematic configuration diagram of a charged body static eliminator in the third embodiment. FIG. 4 is a plan view of the electrode portion of FIG.
The present embodiment is characterized in that a shield body 60 formed in a U-shape in plan view is disposed on the outer portion of the positive electrode 30 and the negative electrode 40. The shield body 60 is formed of an insulator such as synthetic resin.

  In each of the positive electrode 30 and the negative electrode 40, a shield body 60 for preventing electric field leakage is disposed at an outer side position opposite to the other electrode (the negative electrode 40 or the positive electrode 30). Since the parts 62 are arranged in a state of facing each other, the electric field formed by the positive electrode 30 and the negative electrode 40 can be prevented from leaking out of the charged body neutralizing device 10. As a result, it is possible to reliably prevent malfunctions caused by the influence of the electric field from the charged body neutralizing device 10 in other electronic devices or the like disposed around the charged body neutralizing device 10, and to attract charged dust. This is advantageous because it prevents dust from adhering to the positive electrode 30 or the negative electrode 40.

(Static charge removal method)
Next, a method for neutralizing the charged body T using the charged body neutralizing apparatus 10 according to the third embodiment shown in FIGS. 3 and 4 will be described. Here, the case where the charge removal process of the positively charged charged body T is performed will be described.
When a switch (not shown) of the charged body neutralizing device 10 is turned on, the commercial power supplied from the power supply unit 22 is supplied by the control circuit 24, the piezoelectric transformer 26, and the DC voltage amplification circuit 28 to a voltage equal to or higher than the voltage immediately before the corona discharge start voltage. Then, the voltage is applied to the positive electrode 30 and the negative electrode 40 via the current limiting resistor 50.

  When a charged body T is passed in the direction of the arrow shown in FIG. 4 between the positive electrode 30 and the negative electrode 40 to which a voltage equal to or higher than the voltage just before the corona discharge start voltage is applied using a transfer robot (not shown). The electric field between the positive electrode 30 and the negative electrode 40 changes due to the potential of the charged body T, and the density of the electric lines of force increases between the charged body T and the negative electrode 40 to cause a protruding corona discharge. As a result of the corona discharge protruding between the charged body T and the negative electrode 40 in this way, the electrostatic energy of the charged body T is consumed, and the charged body T is finally subjected to a charge removal process. Since the reaction speed when the electric field changes is performed at the speed of light, even if the charged body T is passed between the positive electrode 30 and the negative electrode 40 at a high speed, the charged body T is surely neutralized. be able to.

  FIG. 3 shows a state in which the charged body T passes through an intermediate position between the positive electrode 30 and the negative electrode 40, but when the charged body T is positively charged as in this embodiment. The corona discharge which protruded between the negative electrode 40 and the charging body T can be more effectively performed by passing the position close | similar to the negative electrode 40 as much as possible between the positive electrode 30 and the negative electrode 40. For the same reason, when the charged body T is negatively charged, it is preferable to pass the charged body T between the positive electrode 30 and the negative electrode 40 as close to the positive electrode 30 as possible.

As described above, the charged body neutralizing device 10 and the charged body neutralizing method using the same have been described in detail based on the present embodiment, but the charged body neutralizing device 10 and the charged body neutralizing method using the same in the present invention are technical. The range is not limited to the embodiment shown above. For example, a configuration in which the configurations described in the first to third embodiments described above are appropriately combined may be employed.
2 illustrates a modification of the linear body that constitutes the negative electrode 40, but a projecting body as shown in FIG. May be. Furthermore, in addition to the form in which the protrusions are disposed on only one of the positive electrode 30 and the negative electrode 40, a form in which the protrusions are disposed on both the positive electrode 30 and the negative electrode 40 may be employed.

Moreover, in the above embodiment, when a voltage exceeding the voltage immediately before the corona discharge start voltage is applied to the positive electrode 30 and the negative electrode 40, the positive electrode 30 and the negative electrode 40 are always in a state where corona discharge is performed. However, if the applied voltage is not extremely higher than the voltage immediately before the corona discharge start voltage, the corona discharge continuously generated at the positive electrode 30 and the negative electrode 40 is a so-called weak corona discharge without generation of ozone.
If the charged body T is passed between the positive electrode 30 and the negative electrode 40 where such a weak corona discharge is generated, even if the charged body T has little electrostatic energy, it protrudes with generation of ozone. It is advantageous in that corona discharge can be generated, the electrostatic energy of the charged body T can be surely consumed, and the charge removal process of the charged body T can be reliably performed.

  In addition to such a voltage application state that always causes a weak corona discharge in the positive electrode 30 and the negative electrode 40, when it is clear that the electrostatic energy of the charged body T is sufficiently high, the positive electrode 30 and the negative electrode A voltage immediately before the corona discharge start voltage may be applied to 40. According to such a voltage application state, a weak corona discharge does not occur in the positive electrode 30 and the negative electrode 40, and a corona discharge that protrudes only when the charged body T is passed between the positive electrode 30 and the negative electrode 40. Is advantageous in that it can be generated.

DESCRIPTION OF SYMBOLS 10 Charged body static elimination apparatus 20 Power supply device 22 Power supply part 24 Control circuit 26 Piezoelectric transformer 28 DC voltage amplification circuit 30 Positive electrode 40 Negative electrode 42 Projection body 50 Current limiting resistance 60 Shield body 62 Opening part T Charged body

Claims (5)

A power supply device, and a positive electrode and a negative electrode electrically connected to the power supply device and arranged in parallel at a necessary interval;
The positive electrode and the negative electrode are formed of linear bodies having corona discharge starting voltages equal to each other in the positive electrode and the negative electrode,
The voltage supplied to the positive electrode and the negative electrode is maintained at a voltage equal to or higher than the voltage immediately before the corona discharge start voltage in the positive electrode and the negative electrode ,
By passing the charged body between the positive electrode and the negative electrode, corona discharge is generated in the charged body, the positive electrode, and the negative electrode, and the electrostatic energy of the charged body is released by the release of heat and electromagnetic waves in the corona discharge. A charged body static eliminator which performs a charge neutralization process on the charged body by consuming the same .   The charged body charge eliminating device according to claim 1, wherein at least one protruding body projecting toward the other pole side is disposed on the linear body in at least one of the positive electrode and the negative electrode. apparatus. The positive electrode and the negative electrode are each electrically connected to the power supply device via a current limiting resistor ,
By reducing the amount of current that the current limiting resistor supplies to the positive electrode and the negative electrode, it prevents the corona discharge that protrudes on the surface of the positive electrode or the negative electrode from continuing, and minimizes the amount of ozone generated. The charged body static eliminator according to claim 1 or 2, characterized by being limited to a limit . A charged body discharging method using the charged body discharging device according to any one of claims 1 to 3,
By passing the charged body between the positive electrode and the negative electrode, corona discharge is generated in the charged body, the positive electrode, and the negative electrode, and the electrostatic energy of the charged body is consumed by releasing heat and electromagnetic waves in the corona discharge. The charged body static elimination method characterized by performing static elimination of the said charged body by this.   When passing the charged body between the positive electrode and the negative electrode, the charged body is changed between the positive electrode and the negative electrode depending on whether the charged body is in a positive charged state or a negative charged state. The charged body static elimination method according to claim 4, wherein the negative electrode or the positive electrode is passed closer to the intermediate position than the intermediate position.

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