JP5002464B2 - Static eliminator - Google Patents

Description

  The present invention relates to a static eliminator, and more particularly, to a static eliminator that transports positive and negative ions generated by applying a high voltage to a discharge electrode to an object to be neutralized by air.

  The static eliminator generates ions for static elimination of the charged body. Patent Documents 1 to 3 disclose gun-type static eliminators. This static eliminator can remove ions by directing ions to the object to be neutralized, that is, a charged body, with air discharged from the periphery of the discharge electrode, and it can blow away dust and dust adhering to the object to be neutralized with this air. it can.

  In such a static elimination gun, application of a high voltage to the discharge electrode is started by pulling down the trigger of the static elimination gun held by one hand of the operator, and the ejection of air from around the discharge electrode is started, When the trigger is released, the application of the high voltage is stopped in synchronization with this and the ejection of air from around the discharge electrode is stopped.

  Specifically, as specified in Patent Documents 2 and 3, a mechanical air on-off valve linked to a trigger (trigger) is provided, and the air is synchronized with this by pulling down the trigger. When the opening / closing valve is opened and the ejection of air from around the discharge electrode is started and the trigger is released, the air opening / closing valve is closed in synchronization with this and the ejection of air is terminated.

JP 2000-306693 A JP 2002-208498 A JP 2003-45697 A

  During the static elimination operation, air is ejected to transport ions to the object to be neutralized, and the static eliminator designed with the intention of blowing away dust and dirt attached to the substance to be neutralized by this air (typical example is a neutralization gun) ) Adopts a configuration in which air is continuously ejected during the static elimination operation, as can be seen from the cited documents 2 and 3.

  However, in order to blow away dust and dust adhering to the object to be discharged, intermittent air flow can use pressure fluctuation to separate dust and dust from the object to be discharged rather than continuous air flow. Therefore, it is effective.

  However, the air ejected from the static eliminator during the static elimination operation has a function of transporting ions generated by applying a high voltage to the discharge electrode to the object to be eliminated. When ejected from the static eliminator, the positive / negative ion balance of the ions reaching the static elimination object is destroyed, and this positive or negative unbalanced ion not only significantly reduces the static elimination efficiency of the static elimination object. There is a risk that the object to be discharged will be charged in reverse.

  The objective of this invention is providing the static elimination apparatus which can improve the efficiency which removes the dust and dust adhering to a static elimination object, ensuring the static elimination effect of the static elimination object.

The above technical problem is, according to one aspect of the present invention,
A high voltage is applied to the discharge electrode to alternately generate positive and negative ions, and air is blown from around the discharge electrode to convey the ions toward the object to be discharged. In the static eliminator that neutralizes the static eliminator,
An electromagnetic on-off valve for opening and closing the jet of air;
Control means for controlling opening and closing of the electromagnetic on-off valve and a high voltage applied to the discharge electrode;
A single period or a continuous integer multiple period, that is, a period synchronized with a plurality of periods based on the application of one period of high voltage of the positive and negative electrodes as a basic unit; and Achieved by providing a static eliminator characterized in that opening / closing control of the opening / closing valve is executed by intermittent air jet control in which an interval period for closing the opening / closing valve between the next valve opening period is provided. Is done.

The above technical problem is, according to another aspect of the invention,
The air supplied from the air source through the on-off valve is ejected from around the discharge electrode, and a high voltage is applied to the discharge electrode to alternately generate positive ions and negative ions, from the air source In the static eliminator for carrying out the static elimination of the charge removal object by conveying ions toward the charge removal object by the supplied air,
Control means for controlling opening and closing of the on-off valve and a high voltage applied to the discharge electrode;
The on-off valve is opened for a period synchronized with a single period or a plurality of consecutive periods with the application of one cycle of the high voltage of the positive and negative electrodes as a basic unit, and one valve opening period and the next valve opening period It is achieved by providing a static eliminator characterized in that the opening / closing control of the opening / closing valve is performed by intermittent air jet control in which an interval period for closing the opening / closing valve is provided.

  That is, according to the present invention, the air that is intermittently ejected from the static eliminator by opening and closing the electromagnetic on-off valve between the static eliminator and the air source is synchronized with at least one cycle of high voltage application. The object to be neutralized can be neutralized in a state in which positive and negative ion balance of ions generated by applying a high voltage to the discharge electrode is ensured. Further, since air is intermittently ejected from the static eliminator, dust and dust adhering to the static elimination object can be separated from the static elimination object due to the pressure fluctuation of the intermittent air flow. The efficiency of removing dust and dust adhering to the surface can be improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a static elimination gun, and FIG. 2 is a longitudinal sectional view. Referring to FIGS. 1 and 2, the static elimination gun 1 has an ion and air outlet 3 at the tip of a barrel 2, and a guard cap 4 is detachably disposed around the ionized air outlet 3. Has been. The guard cap 4 has a plurality of air circulation openings 5 in the circumferential direction, and atmospheric air can flow into the guard cap 4 through the air circulation openings 5, and the atmospheric air flow that has entered the inside of the guard cap 4. Accompanies the ionized air flow discharged from the ionized air outlet 3. A trigger 7 is disposed in the grip portion 6 of the static elimination gun 1, and neutralization can be started by drawing the trigger 7 in the direction indicated by the arrow in FIG. 2 (pressing the trigger 7).

  A static elimination module 10 shown in FIG. 3 is mounted inside the outer case 8 of the static elimination gun 1. With reference to FIG. 3, the static eliminator module 10 includes a module main body 11, and an air guide tube 12 is detachably coupled to the module main body 11, and an air source described later through the air guide tube 12. Compressed air from the compressor 13 (FIG. 4) is supplied to the air guide passage 14 in the module body 11.

  The tip of the high voltage cable 15 is inserted into the module body 11. At the tip of the high voltage cable 15, a tubular molded body 18 is fitted on the outer periphery of the insulating endothelium 17 exposed by removing the outermost skin 16, and a shield sleeve 19 is disposed on the outer periphery of the cylindrical molded body 8. It is fitted. The cylindrical molded body 18 is made of an insulating resin.

  The high voltage conducting wire 20 of the high voltage cable 15 is soldered to a metal conductor 21 and is connected to the connector 22 via the metal conductor 21. And this connector 22 is inserted in the front-end | tip part of the cylindrical molded object 18 mentioned above through the cylindrical connector holding body 23. FIG. In this way, the cylindrical molded body 18, the shield sleeve 19, the connector 22, the cylindrical connector holding body 23, and the like are inserted into the module main body 11 in advance in the tip portion of the high voltage cable 15, and Positioned.

  An electrode holder 26 that holds one discharge electrode 25 is hermetically fitted to the front end opening of the module body 11 via a seal member 27, and the electrode holder 26 is fitted to the module body 11, The base end portion of the discharge electrode 25 is fitted into the connector 22 so that the connector 22 and the discharge electrode 25 are electrically connected.

  The electrode holder 26 has a discharge electrode 25 closely fitted in the center thereof, and a total of four air ejection holes 30 are formed around the discharge electrode 25 at equal intervals in the circumferential direction, that is, at 45 ° intervals. Has been. Compressed air from the compressor 13 (FIG. 4) is supplied to these air ejection holes 30 via the air guide passage 14. The discharge electrode 25 fixed to the electrode holder 26 is positioned so that its tip 25a is located inward of the tip surface 26a of the electrode holder 26, as can be seen from FIG.

  In addition, although the static elimination gun 1 of an Example is not provided with a counter electrode, if a counter electrode is provided, it is good to arrange | position to the outer peripheral part of the electrode holder 26 (virtual line 31 of FIG. 3 is shown, for example). reference).

  This static elimination module 10 is used as the static elimination gun 1 by being fixed to the gun outer case 8 using screws in the screw holes 32 shown in FIG. 2, but the mounting bracket 33 provided integrally with the module main body 11. (FIG. 3) can be used by being fixed to an arbitrary device. Reference numeral 34 in FIG. 3 indicates a bolt insertion hole, and the static elimination module 10 can be fixed to, for example, a machine frame of a desired apparatus using the bolt insertion hole 34. Therefore, this static elimination module 10 is used as the static elimination gun 1 by mounting the static elimination module 10 on the gun outer case 8 in the gun mode to be described later. On the other hand, in the spot mode to be described later, the static elimination module 10 itself is desired. Used as a static eliminator by assembling to the device.

  FIG. 4 is a system diagram related to the static elimination module 10, and the pulsed AC method is used for power supply to the discharge electrode 25. The air guide tube 12 connected to the static elimination module 10 is connected to the compressor 13 via an electromagnetic on-off valve 40. Compressed air of 0.6 to 0.7 MPa is discharged from the compressor 13, and when the pressure becomes higher than this set value, the operation of the compressor 13 is automatically stopped. Needless to say, the compression rate of the compressed air from the compressor 13 can be changed by setting the compressor. If the pressure becomes higher than the set value by the control of the compressor itself, the operation of the compressor 13 is automatically stopped. Is done.

  A positive high voltage power supply circuit 42 and a negative high voltage power supply circuit 43 are connected to the discharge electrode 25 through protective resistors 41 and 41, respectively. The positive and negative high voltage power supply circuits 42 and 43 are respectively connected to the positive electrode, The power supply circuit 46 is connected via negative switches 44 and 45. The positive and negative high voltage power supply circuits 42 and 43 are grounded via a resistor 47. When a charged body, that is, an object to be neutralized (not shown) is charged to either positive or negative polarity, depending on the magnitude and polarity of the charge, the direction of current flowing through the resistor 47 and the current value ( The current value) magnitude or voltage value (voltage value) changes. Accordingly, the direction of the current and the current value or voltage value are detected by the resistor 47, and this value is compared with a preset reference value by the comparator 49 via the amplifier 48. The comparison result is input to the control unit 51. In the case of the pulse AC method, for example, a duty ratio that relatively increases the ratio of the polarity necessary for static elimination is calculated, and static elimination control based on this is performed. The duty ratio here is, of course, the ratio between the positive and negative voltages in one cycle (a period in which high voltage is applied once each for positive and negative) applied to the discharge electrode 25. It is.

  The control unit 50 includes a trigger switch 52 that is turned on when the operator operates a foot switch that can be operated with a foot and a trigger 7 that can be operated with a finger to request the start or end of charge removal control according to the operator's intention. (FIG. 2), a signal is input from the external control circuit via the input circuit 53. The foot switch is disposed at the operator's foot, and the trigger switch 52 is disposed adjacent to the trigger 7 of the static elimination gun 1 so that the operator can use the foot switch or the trigger 7 with his / her foot or finger. Is turned on when the foot switch is depressed (or the trigger 7 is pushed into the grip 6). In general, the trigger 7 or foot switch ON / OFF signal is input to the input circuit 53 in the gun mode, which will be described later, and in the spot mode, from an external control circuit such as a device in which the static elimination module 10 is incorporated. An ON signal or an OFF signal for requesting the start or end of charge removal control is input to the input circuit 53.

  The connection terminals of the foot switch and the trigger switch 52 are shared, and the foot switch and the trigger switch 51 can be selectively connected to one specific connection terminal of the control unit 50. An open / close signal is supplied from the electromagnetic valve driver circuit 54 to the electromagnetic open / close valve 40 described above. The control unit 50 also has a display unit connected to the ion level alarm output circuit 55, which will be described later.

  FIG. 5 is a front view of the control unit 50. The control unit 50 has a terminal block 60 provided with a plurality of connection terminals at the lower end, and a plurality of lighting means, that is, LED groups 61 arranged in a column are arranged above the terminal block 60. This LED group 61 is used to display the ion balance or display the degree of ion generation (ion level) by operating the display changeover switch 62. When the ion balance display is selected as the LED group 61 display, The ion balance selection indicator lamp 63 disposed above the group 61 is turned on. On the other hand, when the ion level display is selected as the display of the LED group 61, the ion level selection display lamp 64 disposed next to the balance lamp 63 is turned on.

  An up switch 65 and a down switch 66 are disposed under the LED group 61. The up switch 65 or the down switch 66 is configured to increase or decrease the positive or negative duty ratio in units of a predetermined value by a single push operation. For example, when the ion switch is measured using a well-known ion plate monitor and the display reference of the ion balance is set, the up switch 65 or the down switch 66 is set to a desired value (usually a normal value). The switch push operation is repeated as necessary so that the neutralization state becomes zero. In addition, when adjusting the ion balance using only the LED group 61 for displaying the ion balance, the LED in the middle of the LED group 61 is in a reference ion balance state (for example, positive and negative ion generation amounts are equal). The ion generation state can be set using the up switch 65 or the down switch 66 so as to light up.

  The control unit 50 also has an alarm indicator lamp 67, an ion level alarm indicator lamp 68, and a condition alarm indicator lamp 69 that are turned on when some abnormal condition occurs. The ion level warning indicator lamp 68 is lit when the ion generation amount, that is, the ion level is lower than a predetermined value. The condition alarm indicator lamp 69 is lit when the charge of the charged body, that is, the object to be removed, is too large to complete the charge removal or when the ion balance cannot be maintained.

  The control unit 50 further includes a mode changeover switch 70 including a three-position slide switch. When the first position of the mode changeover switch 70 is selected, the static eliminator module 10 operates in the spot mode (“SPOT mode”). When the second position is selected, the static elimination module 10 operates in the gun mode (“GUN mode”), and when the third position is selected, the static elimination module 10 operates in the test mode. By selecting this test mode, an input / output terminal test, an intentional abnormality signal, that is, a dummy signal, is generated to detect the degree of contamination of the discharge electrode 25, to detect a charge removal failure, and to perform an operation test of the on-off valve 40. be able to.

  The spot mode (“SPOT” mode) is selected when the static elimination module 10 is installed in a desired device and static elimination is performed continuously. When the spot mode is selected, as shown in the timing chart of FIG. 6, when the ion level decreases due to wear or dirt of the discharge electrode 25, an ion level alarm signal is output and the ion level alarm indicator lamp 69 is turned on. . This ion level warning indicator lamp 69 continues to be lit until the operation of the static eliminator module 10 is stopped when an OFF signal is input to the input circuit 53 from an external control circuit such as a device in which the static eliminator module 10 is incorporated. In other words, the lighting of the ion level alarm indicator lamp 69 is canceled only when an OFF signal is input to the input circuit 53.

  On the other hand, the gun mode (“GUN” mode) is selected when ON / OFF of the trigger 7 is frequently repeated using the static elimination module 10 as the static elimination gun 1. When the gun mode is selected, as shown in the timing chart of FIG. 7, when the ion level decreases due to wear or dirt of the discharge electrode 25, an ion level alarm signal is output and the ion level alarm indicator lamp 69 is turned on, The ion level alarm indicator lamp 69 is turned off by turning off the power of the static elimination gun 1 or switching to the maintenance mode with the control unit 50. That is, in the gun mode (“GUN” mode), the trigger 7 is frequently turned ON / OFF as described above, but the ion level warning indicator lamp 69 continues to be lit without being affected by the OFF of the trigger 7. .

  By the way, the ion level alarm indicator lamp 69 is turned on to warn the operator that the wear or dirt of the discharge electrode 25 has reached the alarm level. If the lamp 69 is extinguished, the meaning is diluted by turning on the ion level alarm display lamp 69. Therefore, in the gun mode, which is a usage mode in which ON / OFF is frequently repeated, the operator is accurately warned of wear and dirt of the discharge electrode 25 by separating the extinction of the ion level alarm indicator lamp 69 from the OFF operation of the trigger 7. can do.

  Although the pulse AC type static elimination module 10 has been described above, a pulse DC type power supply system may be adopted as a modification. FIG. 8 shows an overall system diagram of the pulse DC system, and the same elements as those included in the system diagram (FIG.) Of the pulse AC system are denoted by the same reference numerals, and the description thereof is omitted. In the pulse DC system, the discharge electrode 25 includes a positive discharge electrode 25 (+) and a negative discharge electrode 25 (−). Is supplied to the negative electrode discharge electrode 25 (−) from the negative high voltage power supply circuit 43, and the high voltage of the positive electrode and the high voltage of the negative electrode are alternately positive and negative. Applied to the electrodes 25 (+) and 25 (-).

  The static elimination module 10 discharges air by opening and closing the electromagnetic on-off valve 40 in both the spot mode (“SPOT mode”) and the gun mode (“GUN mode”) or in the gun mode (“GUN mode”). Air intermittent ejection mode that intermittently performs air and continuous air ejection mode that continuously discharges air as in the past, and this air intermittent ejection mode and continuous air ejection mode can be selectively set by the operator It is.

  The intermittent air ejection mode will be described by taking the pulse AC type static elimination module 10 as an example. As can be seen from FIGS. 9 and 10, the electromagnetic on-off valve 40 is preferably at the start timing of application of a high voltage to the discharge electrode 25. The valve is opened in synchronism and is closed in synchronism with the stop timing of application of the high voltage. Ions generated by applying a high voltage to the discharge electrode 25 are charged, that is, an object to be discharged (not shown) by an air flow discharged from the air ejection hole 30 in synchronization with the application timing of the high voltage to the discharge electrode 25. To remove the charge to be removed. In addition, since the air flow accompanied with ions is intermittently blown to the charged body, the dust and dust adhering to the object to be discharged are blown off more effectively than the air flow is continuously blown to the charged body. be able to.

  As the most preferable mode of the intermittent air ejection mode, the closing timing of the electromagnetic on-off valve 40 is such that the application of a negative high voltage (negative ion generation) is completed after the application of a positive high voltage (positive ion generation). Synchronized with the timing. In other words, it is synchronized with the timing at which the application of a positive high voltage (positive ion generation) ends after the application of a negative high voltage (negative ion generation). That is, when one cycle of positive high voltage application and next negative high voltage application or negative high voltage application and next positive high voltage application is considered as one unit (positive and negative ion generation) The electromagnetic on-off valve 40 is closed in synchronism with this one cycle, that is, the timing when the application of the high voltage of one unit ends.

  FIG. 9 shows an example in which the electromagnetic on-off valve 40 is closed in synchronization with one cycle, that is, the end timing of the high voltage application of one unit, and the discharge of air from the air ejection hole 30 is stopped. An example is shown in which the electromagnetic on-off valve 40 is closed in synchronization with the end timing of the high voltage application of two units, and the discharge of air from the air ejection holes 30 is stopped. FIG. 10 shows a control for opening / closing the electromagnetic on / off valve 40 synchronized with one unit in units and a control for opening / closing the electromagnetic on / off valve 40 synchronized with two adjacent units. This is an example of mixing. That is, in the opening period of the electromagnetic on-off valve 40, one cycle of high voltage application, that is, one unit, is synchronized with a combination of a single unit and a continuous integer multiple, that is, a plurality of units, or a different number of units. Control in which different periods are mixed may be performed. In other words, FIG. 10 includes a mixture of a first air discharge period synchronized with one unit, that is, one cycle of high voltage application, and a second air discharge period synchronized with two consecutive units, that is, two consecutive periods of high voltage application. Then, as an air stop period, that is, an interval period, a first interval period synchronized with a half cycle of high voltage application, and a second interval period synchronized with one period that is an integral multiple (2 times) of the half period An example of mixing control is shown. Here, the “half cycle” means a period in which a positive or negative high voltage included in the application of one cycle of positive and negative high voltages is applied, and the “half cycle” in this specification is one cycle. It should be understood that the positive or negative high voltage application period included in the positive and negative high voltage application is the meaning.

  Moreover, it is a figure for demonstrating that it is arbitrary as long as it synchronizes with the start timing of a positive or negative high voltage application as the valve opening timing of the electromagnetic on-off valve 40. That is, the valve closing period (interval period) of the electromagnetic on-off valve 40 is not necessarily the same as the valve opening period (air discharge period), and the electromagnetic on-off valve is synchronized with the start timing of positive or negative high voltage application. As long as the valve 40 is opened, the electromagnetic on-off valve 40 may be opened at an arbitrary timing. In addition, as long as the valve closing period (interval period) of the electromagnetic on-off valve 40 is based on the width of a single high voltage pulse, which is a half cycle of positive or negative high voltage application, that is, high voltage application, a plurality of periods. Valve closing control in which different periods synchronized with adjacent high voltage pulses are mixed may be performed.

  As described above, the positive and negative ions are generated as one unit, and the discharge of the air from the air ejection holes 30 is stopped in synchronization with the end timing of one or a plurality of units. The ions can be transported to the object to be neutralized by the air flow, and the charged body, that is, the object to be neutralized, can be neutralized with one unit of positive and negative ions as a unit. Even if the DC method is adopted as a method of applying a high voltage to the static elimination module 10, as shown in FIG. 11, the air ejection hole 30 is synchronized with the end timing of positive / negative high voltage application of one or a plurality of units. It is preferable to stop the discharge of air from the air (air discharge period, that is, the end of the interval period).

  In other words, when the control for opening and closing the electromagnetic on-off valve 40 is independently controlled independently of the control for applying a high voltage to the discharge electrode 25, the ions in the portion indicated by the broken line in FIG. Since it is no longer transported, there is a risk that the charge removal efficiency of the charge removal object will decrease. Even if the control for opening and closing the electromagnetic on-off valve 40 is associated with the control for applying a high voltage to the discharge electrode 25, for example, as shown in FIG. When the on-off valve 40 is opened, only positive ions are carried by air with respect to the object to be removed, and negative ions are not carried by air, which may cause the object to be removed to be positively charged. .

  On the other hand, by opening the electromagnetic on-off valve 40 in synchronism with the application of a high voltage of a single unit or a plurality of units, that is, a single cycle or a plurality of continuous cycles, a single or a plurality of positive and negative ions are covered. Since the air can be transported to the neutralization object, dust and dirt adhering to the neutralization object can be effectively removed because the intermittent air flow accompanied by ions is blown to the neutralization object while neutralizing the neutralization object. Can be blown away.

  As described above, in both the spot mode and the gun mode or the gun mode, when the air intermittent ejection mode in which the air is intermittently discharged by opening and closing the electromagnetic on-off valve 40 is selected, the air flow is intermittent. In addition to the neutralization effect, dust and dust adhering to the object to be discharged can be effectively blown off. As a preferred mode, the air discharge start timing, that is, the opening timing of the on-off valve 40 is synchronized with the positive or negative high voltage application start timing, and the air discharge end timing, that is, the control of the valve closing timing of the on-off valve 40 is controlled. When the application of positive and negative high voltage after opening the on-off valve 40 is one unit, the on-off valve 40 is closed in synchronization with the end timing of one or more units, Dust and dust adhering to the object to be discharged can be effectively blown off by an air flow accompanied by ions while ensuring the charge removing efficiency of the charged object.

  Next, control for terminating the operation of the static elimination module 10 will be described. This operation end control is equally applicable regardless of the AC method or DC method, and regardless of the spot mode or gun mode. Several examples relating to the operation end control will be described below, but this is added to an example particularly effective in the gun mode.

  When the application of the high voltage is stopped as shown in FIG. 14, for example, in accordance with the foot switch or the trigger 7 OFF operation, the operation of the static elimination module 10 is applied with a positive high voltage as shown in the figure at the end of the high voltage control. If this is the case, the object to be discharged may be positively charged by the polarity (positive electrode) of the last high voltage. Incidentally, in the past, this method has been adopted, and for example, control for terminating the application of the high voltage according to the OFF operation of the trigger 7 has been performed.

  Referring to FIGS. 15 to 17, in high voltage control (hereinafter referred to as “high voltage application end control”) when ending the operation of the static elimination module 10, the trigger 7 and the foot switch are turned off to control static elimination. When a control end request signal that means the end of the input is input to the control unit 50, the application of the high voltage that is being executed at the OFF timing is completed without ending the high voltage control at the OFF operation timing. It is preferable to end the high voltage control after waiting.

  Furthermore, as a first specific example, at least the timing for completing each cycle is based on one cycle, which is a set of positive and negative ions generated by the ON operation of the foot switch or the trigger 7 as a set. There is a way to end high voltage control. That is, if the high voltage control is started from the application of the positive electrode to the discharge electrode 25, and then the high voltage application of the positive electrode is performed in the process in which several sets of high voltage control, that is, the high voltage application of a plurality of consecutive cycles are executed. When the trigger 7 or foot switch is turned OFF during execution and a control end request signal is input to the controller 50, the high voltage control is terminated with the completion of the high voltage control of the negative electrode included in the cycle of the set. The method of doing can be mentioned. Of course, when the trigger 7 or the foot switch is turned off, after the high voltage control of the predetermined negative electrode of the set cycle is completed, the high voltage control of the predetermined number of cycles is continuously executed, and then the high voltage control is performed. It can also be completed.

  As a specific second example, the trigger 7 is applied when a positive or negative voltage is applied after the high voltage control started by the foot switch or the trigger 7 being turned on executes a predetermined number of cycles. When the foot switch or the foot switch is turned off, there is a method of ending the high voltage control with the end of the cycle (positive and negative set) at the time of the OFF timing.

  In this second example, if the foot switch or trigger 7 is turned off immediately after the high voltage control is started by the foot switch or trigger 7 being turned on, the charge is removed to the polarity to which the high voltage was last applied. Since the object may be charged, the cycle executed after the foot switch or trigger 7 is turned on is counted, and on condition that this count value exceeds a predetermined value, that is, the foot switch or trigger 7 is turned on. This second method is adopted on the condition that the number of cycles executed later exceeds a predetermined number, and when the number of cycles executed after the ON operation of the foot switch or trigger 7 is smaller than the predetermined number, It is preferable to perform control employing the first control.

  Further, as a third example, after the high voltage control started by the ON operation of the foot switch or the trigger 7 is executed a predetermined number of positive or negative high voltage applications, a positive or negative high voltage is applied. When the number of times of voltage application is counted and this count value is larger than a predetermined value, the trigger 7 or foot switch is turned OFF when a positive or negative high voltage is applied, and the control end request signal is controlled. When input to the unit 50, there is a method of terminating the high voltage control when the high voltage application of one polarity being executed at the timing of the OFF operation and the high voltage application of the next other polarity are completed. .

  However, in this third example, when the foot switch or trigger 7 is turned OFF immediately after the high voltage control is started by the ON operation of the foot switch or trigger 7 as in the second example described above. If the object to be charged is charged to the polarity of the last applied high voltage, count the number of positive or negative high voltage applications after the ON operation, and this count value is greater than the predetermined value As described above, the method of the third example is adopted as described above, and in the case of a count value lower than that, it is preferable to perform the control adopting the first control described above.

  In the above-described high voltage control method of the first to third examples, that is, the high voltage application end control method after the trigger 7 or the foot switch is turned off, in the case of the first example, the electromagnetic on-off valve 40 In the control, it is preferable that at least the state of the electromagnetic valve 40 at the time when the foot switch or trigger 7 is turned off is maintained for a period of one cycle of the high voltage control at the time of turning off. In addition, when the high voltage application is executed a predetermined number of times thereafter to terminate the high voltage control, the solenoid valve 40 may be maintained in either the open state or the closed state in each cycle. .

  In the case of the second example described above, the control of the electromagnetic on-off valve 40 is preferably maintained at least in the state of the electromagnetic valve 40 at the time of the OFF operation of the trigger 7 or the foot switch until the end of the high voltage control. However, in this case, the state of the electromagnetic on-off valve 40 at the time when the trigger 7 or the foot switch is turned off may be fixed until the high voltage control is completed, or may be fixed in either the open or closed state. Alternatively, the opening / closing of the electromagnetic on-off valve 40 may be repeated.

  In the case of the above-described third example, it is preferable that the electromagnetic on-off valve 40 is controlled to maintain at least the state of the electromagnetic valve 40 at the time when the trigger 7 or the foot switch is turned off until the high voltage control ends. However, in this case, the state of the electromagnetic on-off valve 40 at the time of the trigger 7 or foot switch OFF operation may be fixed until the high voltage control is completed, or fixed to either the open or closed state. Alternatively, the opening / closing of the electromagnetic on-off valve 40 may be repeated.

  However, from the viewpoint of efficiently supplying the generated ions to the object to be discharged until the high voltage control is completed, the opening period of the electromagnetic on-off valve 40 is further set to at least one unit of high voltage corresponding thereto. It is preferable to synchronize with the application and continue the high voltage application control correspondingly.

  In FIG. 15, the opening / closing cycle of the electromagnetic opening / closing valve 40 is synchronized with the high voltage application period of one unit in both the opening and closing periods of the opening / closing valve 40. That is, an air ejection period synchronized with one cycle of high voltage application and an interval period (valve closing period) of one cycle are set. Then, when the trigger 7 or the foot switch is turned OFF and the control end request signal is input to the control unit 50, if the electromagnetic on-off valve 40 is in the valve closing period, that is, the interval period, then the electromagnetic on-off valve 40 However, the electromagnetic valve control is continued until the valve opening period, that is, the air ejection period ends and the air ejection period ends, and the high voltage application control is also continued.

  FIG. 16 shows that the opening / closing cycle of the electromagnetic opening / closing valve 40 is such that the opening / closing period of the opening / closing valve 40 is synchronized with the high voltage application period of one unit and the closing period is synchronized with the pulse width of one high voltage pulse. Is set. That is, an air ejection period synchronized with one cycle of high voltage application and a half-cycle interval period (valve closing period) are set. According to the illustration of FIG. 16, the electromagnetic on-off valve 40 is operated to turn off the trigger 7 or the foot switch during the valve opening period (air ejection period). The high voltage application termination control after the trigger 7 is turned off is terminated when the application of the high voltage of one unit at which the electromagnetic on-off valve 40 is opened is terminated. And with this high voltage application end control, the electromagnetic on-off valve 40 is kept open, and this valve open state ends when the high voltage application end control ends.

  In FIG. 17, both the valve opening period and the valve closing period of the electromagnetic on-off valve 40 are synchronized with the high voltage application period of one unit. That is, an air ejection period synchronized with one cycle of high voltage application and an interval period (valve closing period) of one cycle are set. According to the example of FIG. 17, the trigger 7 is turned OFF while the electromagnetic on-off valve 40 is in the valve opening period (air ejection period). The high voltage application termination control after the trigger 7 is turned off is terminated when the application of the high voltage of one unit at which the electromagnetic on-off valve 40 is opened is terminated. And with this high voltage application end control, the electromagnetic on-off valve 40 is kept open, and this valve open state ends when the high voltage application end control ends.

  As described above, in the high voltage application end control when the operation of the static elimination module 10 is ended, when the trigger 7 or the foot switch is turned OFF and a control end request signal is input to the control unit 50, the trigger 7 or the like The high voltage application control and the air ejection control are terminated after at least one unit of high voltage application involving the ejection of air is performed without immediately terminating the high voltage application control in synchronization with the OFF operation of the charged body. In other words, the operation of the static elimination module 10 can be completed while maintaining the ion balance of the static elimination object, thereby preventing adverse effects on the static elimination object accompanying the termination of the static elimination control.

  Referring to FIG. 18, when the trigger 7 or the foot switch is turned OFF in the high voltage application end control when the operation of the static elimination module 10 is ended, the width of the high voltage pulse is gradually increased in the subsequent high voltage control. You may make it perform the high voltage application completion | finish control made small. According to this, since the amount of ions generated by the static elimination module 10 can be gradually reduced, it is possible to reduce the adverse effects on the static elimination objects accompanying the termination of the static elimination control. As a modified example, as shown in FIG. 19, in the high voltage application end control of the static elimination module 10, control for gradually decreasing the high voltage value may be performed. Therefore, it should be recognized that the control for gradually reducing the width of the high voltage pulse and the control for gradually reducing the high voltage value are equivalent as control for reducing the amount of generated ions. Accordingly, in the following description, even if an example in which the high voltage pulse width is gradually reduced is disclosed, this includes an example in which the high voltage value is gradually reduced.

  Further, in the high voltage application end control of the static elimination module 10, the high voltage application end control for gradually decreasing the width of the high voltage pulse in accordance with the OFF operation of the trigger 7 or the foot switch, or the high voltage for gradually decreasing the high voltage value. The application end control can be equally applied in both the spot mode and the gun mode, and can be equally applied in both the intermittent air ejection mode and the continuous air ejection mode.

  Next, air ejection control that can be suitably applied in the intermittent air ejection mode in the operation end control will be described. The example described below is preferably applied to the static elimination gun 1. In the intermittent air ejection mode, as a particularly preferable example, the electromagnetic on-off valve 40 is controlled in association with high voltage control in units of one or more units as described above, but the trigger 7 that is frequently turned on / off is used. OFF operation (OFF of the trigger switch 52), that is, when the discharge of air is stopped by closing the electromagnetic on-off valve 40 in synchronism with the timing at which the control unit 50 inputs the static elimination control end request signal, Even if the high voltage application end control is executed, ions are not sufficiently transported to the object to be removed, so that the significance of the high voltage application end control may be diluted.

  Drawings subsequent to FIG. 18 illustrate the control after the foot switch or trigger 7 OFF operation (turning off the trigger switch 52) related to air ejection (referred to as “air ejection end control”) in addition to the high voltage application termination control. FIG.

  FIGS. 18 and 19 show an example in which the opening / closing control of the electromagnetic opening / closing valve 40 is executed at least once using the above-described unit or units as a basic unit even when the trigger 7 is turned off. In the air ejection end control after the trigger 7 is turned off, the opening / closing control of the electromagnetic opening / closing valve 40 may be performed by opening / closing the electromagnetic opening / closing valve 40 in synchronization with the application of a high voltage of one unit. The unit may be opened and closed in synchronization with the application of a high voltage of a plurality of units (FIG. 20).

  The air ejection end control may be performed differently when the valve 7 is in the closed state on condition that the electromagnetic on-off valve 40 is in the open state when the trigger 7 is turned off. An example of air ejection end control when the electromagnetic on-off valve 40 is in the open state when the trigger 7 is turned off will be described with reference to FIGS.

  In the air ejection end control of FIG. 21, when the electromagnetic on-off valve 40 is in the open state at the time when the trigger 7 is turned off, the electromagnetic on-off valve continuously until the high voltage application end control ends. The valve open state 40 is maintained, and the electromagnetic on-off valve 40 is closed in synchronization with the end timing of the high voltage application end control.

  In the air ejection end control of FIG. 22, when the electromagnetic on-off valve 40 is in the open state at the time when the trigger 7 is turned off, the opening time of the electromagnetic on-off valve 40 is extended. A valve opening period is set. That is, in the example of FIG. 22, the valve opening period before the trigger 7 is turned off is set in synchronization with the positive / negative high voltage application period of one unit, but after the trigger 7 is turned off, the air As the ejection end control, a synchronized valve opening period (air ejection period) of two units added by one unit is set, and the air ejection termination control is terminated when the valve opening period of the two units is completed.

  Similarly to the example of FIG. 22, when the electromagnetic on-off valve 40 is in an open state (air is being blown out) at the time when the trigger 7 is turned off, the valve opening period of the electromagnetic on-off valve 40 until then is also shown in FIG. In this example of FIG. 23, the valve opening period (air ejection period) is 2 units of positive and negative high voltages. It is set in synchronization with the application period, but as an air ejection end control after the trigger 7 is turned OFF, 3 units added by 1 unit are synchronized and the valve opening period is synchronized (the air ejection period is extended by 1 unit). Is set, and the air ejection end control is ended when the valve opening period of the two units ends.

  24 to 26 show that the electromagnetic on-off valve 40 is in an open state (air is being blown out) at the time when the trigger 7 is turned off, and is electromagnetic for the same period as the previous valve opening period. An example is shown in which the air ejection end control is terminated when the on-off valve 40 continues to be opened and the valve opening period ends.

  That is, in the example of FIG. 24, the valve opening period (air ejection period) of 2 units and the valve closing period (interval period) of 2 units are set, but when the trigger 7 is turned OFF, the electromagnetic type When the on-off valve 40 is in the open state (air is being blown out), the open state continues even after the trigger 7 is turned off until the end of the open period, and the open period of the two units has ended. At that time, the air ejection end control is terminated.

  The example of FIG. 25 is an example in which a valve opening period synchronized with the high voltage application of one unit and a valve closing period synchronized with the pulse width of one high voltage pulse are set, but the trigger 7 is turned off. When the electromagnetic open / close valve 40 is in the open state at this point, the valve open state continues even after the trigger 7 is turned off until the valve open period ends, and the valve open period of this one unit ends. At this point, the air ejection end control is terminated.

  In the example of FIG. 26, the valve opening period synchronized with the high voltage application of 2 units and the valve closing period synchronized with the pulse width of one high voltage pulse are set, but the trigger 7 is turned off. When the electromagnetic open / close valve 40 is in the open state at this point, the open state continues even after the trigger 7 is turned off until the open period ends, and the open period of the two units ends. At this point, the air ejection end control is terminated.

  27 and 28 show an example of air ejection end control when the electromagnetic on-off valve 40 is in a closed state (during an interval) when the trigger 7 is turned off.

  In the example of FIG. 27, when the electromagnetic on-off valve 40 is in a closed state when the trigger 7 is turned off, the closed state of the electromagnetic on-off valve 40 is continued after the trigger 7 is turned off. In other words, an example in which the opening / closing control of the electromagnetic opening / closing valve 40 is ended is shown. According to this example, there is a possibility that even if the above-described high voltage application end control is executed, ions may not be sufficiently transported to the object to be neutralized, but will not adversely affect the ion balance in the vicinity of the object to be neutralized. In this sense, it is effective.

  In the example of FIG. 28, when the electromagnetic on-off valve 40 is in a closed state when the trigger 7 is turned off, in the air ejection end control after the trigger 7 is turned off, the electromagnetic on-off valve 40 is closed. An example of shortening the valve period is shown. That is, as can be seen from the timing chart of FIG. 28, this is an example in which one unit of valve opening period (one period of air ejection period) and one unit of valve closing period (one period of interval period) are set. When the electromagnetic on-off valve 40 is in a closed state when the trigger 7 is turned off, the valve closing period is shortened to one high voltage pulse width (half cycle), and then the electromagnetic on-off opening / closing is performed. An example is shown in which the valve 40 is opened and closed in units of one unit in synchronization with a single unit or a plurality of units, and thereafter the opening and closing control of the electromagnetic on-off valve 40 is terminated.

  The control unit 50 may have a cleaning mode function for cleaning the discharge electrode 25 with an air flow when the discharge electrode 25 becomes dirty. FIG. 29 is a diagram for explaining control in the cleaning mode. In the cleaning mode, the application of the high voltage to the discharge electrode 25 is temporarily interrupted, but this may be continued.

  For example, when the contamination of the discharge electrode 25 is detected and the mode is automatically switched to the cleaning mode, the cleaning switch is turned on for a certain period when the contamination of the discharge electrode 25 is detected, and the discharge electrode 25 is cleaned ( FIG. 29). In this cleaning mode, the opening / closing of the electromagnetic on-off valve 40 is repeated at a shorter cycle than in the spot mode or the gun mode, and thereby pulsating air is discharged from the air ejection holes 30 around the discharge electrode 25, The substance adhering to the discharge electrode 25 can be blown off by the pressure fluctuation due to the pulsation of the air flow. That is, the cleaning effect of the discharge electrode 25 can be improved.

  As described above, when the electromagnetic on-off valve 40 is provided between the compressed air source (compressor 13) and the static eliminator module 10 and the on-off valve 40 is frequently controlled to open and close, the life of the on-off valve 40, especially the wear of the seal member. May cause air leakage. In order to cope with this, it is preferable to provide an indicator lamp (not shown) for warning that the life of the electromagnetic on-off valve 40 is near to the control unit 50. Then, the number of times the electromagnetic on-off valve 40 is opened and closed is counted and stored in the memory in the control unit 50, and the life warning indicator lamp is turned on when the accumulated number exceeds a predetermined number. Is good. By turning on the life warning indicator lamp, the operator can know that it is time to replace the seal member of the electromagnetic on-off valve 40.

  As a modified example, when the intermittent air ejection mode is selected, the ion level when the electromagnetic on-off valve 40 is ON is compared with the ion level when the electromagnetic open / close valve 40 is OFF. When it rises relatively, that is, when the difference between the ion level when the electromagnetic on-off valve 40 is ON and the ion level when it is OFF becomes smaller than a predetermined value, the life warning indicator lamp May be lit. That is, an increase in the ion level when the electromagnetic on-off valve 40 is OFF means that an air leak has occurred in the on-off valve 40, and as a result, ions are generated by the air discharged from the air ejection holes 30. It can be estimated that the charged object, that is, the object to be neutralized, is conveyed.

It is a perspective view of the static elimination gun to which this invention was applied. It is a longitudinal cross-sectional view of the static elimination gun of FIG. It is sectional drawing of the static elimination module assembled | attached to the static elimination gun of FIG. It is the whole system diagram of the static elimination apparatus at the time of employ | adopting a pulse AC system as a high voltage application system of a static elimination module. It is a front view of the control unit contained in the static elimination apparatus to which this invention is applied. It is a timing chart for demonstrating cancellation | release of the ion level alarm signal in the spot mode ("SPOT" mode) included in the static elimination control mode of a control unit. It is a timing chart for demonstrating cancellation | release of the ion level alarm signal in the gun mode ("GUN" mode) included in the static elimination control mode of a control unit. It is a whole system diagram of the static elimination apparatus at the time of employ | adopting a pulse DC system as a high voltage application system of a static elimination module as a modification. It is a timing chart for demonstrating an example which performs opening / closing control of an electromagnetic on-off valve in relation to high voltage control. Here, the open / close period of the electromagnetic on-off valve (air ejection period) synchronized with high voltage control of one cycle of positive and negative and the close-up period (interval of the electromagnetic on-off valve synchronized with high voltage control of one cycle of positive and negative Period). It is a timing chart for demonstrating an example which performs opening / closing control of an electromagnetic on-off valve in relation to high voltage control. Here, the opening / closing period (air injection period) of the electromagnetic on-off valve synchronized with the positive and negative high voltage control and the half period and the single electromagnetic cycle synchronized with the positive and negative high voltage control. The present invention relates to control in which a valve closing period (interval period) of a valve is set. As a modification, in a static eliminator that applies a high voltage by the DC method, the opening / closing period (air injection period) of the electromagnetic on-off valve is set with one positive / negative cycle as the basic unit, and the half cycle is set as the basic unit. It is a timing chart regarding the control which set the valve opening period (interval period) of the electromagnetic on-off valve of 1 period of 2 times. It is a timing chart for demonstrating the problem at the time of ejecting air intermittently irrespective of high voltage control. FIG. 6 is a timing chart for explaining that a problem occurs depending on the method of intermittent air control even when intermittent ejection control of air is performed in association with high voltage control. It is a timing chart for demonstrating a problem at the time of ending both high voltage control and air ejection control synchronizing with the OFF operation of a trigger. 6 is a timing chart for explaining an example in which high voltage application end control and intermittent air ejection control are executed after a trigger OFF operation. 7 is a timing chart for explaining high voltage application end control and air injection end control after trigger OFF when air is jetted at the time of trigger OFF operation. FIG. 17 is a timing chart for explaining the high voltage application end control and the air ejection end control after the trigger is turned off in a case different from that in FIG. 16 when air is ejected at the time of the trigger OFF operation. It is a timing chart for demonstrating an example of the high voltage application completion | finish control and air ejection completion | finish control which reduce ion generation amount gradually after OFF operation of a trigger. It is a timing chart for demonstrating the other example of the high voltage application completion | finish control and air ejection completion | finish control which reduce ion generation amount gradually after the trigger OFF operation. 12 is a timing chart for explaining still another example of high voltage application end control and air ejection end control for gradually decreasing the amount of ion generation after the trigger OFF operation. 12 is a timing chart for explaining still another example of high voltage application end control and air ejection end control for gradually decreasing the amount of ion generation after the trigger OFF operation. When performing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the air ejection end control is executed under the condition that the air ejection period is executed at the time of the trigger OFF operation. It is a timing chart for explaining an example. When performing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the air ejection end control is executed under the condition that the air ejection period is executed at the time of the trigger OFF operation. It is a timing chart for demonstrating another example. When performing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the air ejection end control is executed under the condition that the air ejection period is executed at the time of the trigger OFF operation. It is a timing chart for demonstrating another example. When performing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the air ejection end control is executed under the condition that the air ejection period is executed at the time of the trigger OFF operation. It is a timing chart for explaining other examples. When performing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the air ejection end control is executed under the condition that the air ejection period is executed at the time of the trigger OFF operation. It is a timing chart for explaining other examples. When executing the high voltage application end control that gradually decreases the ion generation amount after the trigger OFF operation, and when the trigger OFF operation is performed under the condition that the interval period is executed at the time of the trigger OFF operation It is a timing chart for demonstrating the example which continues the valve closing state of an electromagnetic on-off valve as it is. When executing high voltage application end control that gradually decreases the amount of ions generated after the trigger OFF operation, the trigger OFF operation is performed under the condition that the interval period is being executed at the time of the trigger OFF operation. It is a timing chart for demonstrating the example of the air ejection completion | finish control performed at the same time. It is a timing chart for demonstrating an example of the air ejection control in the cleaning mode performed when the stain | pollution | contamination of a discharge electrode is detected.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Static elimination gun 10 Static elimination module 13 Compressor 25 Discharge electrode 30 Air ejection hole 40 Electromagnetic on-off valve 50 Control unit

Claims (9)

A high voltage is applied to the discharge electrode to alternately generate positive and negative ions, and air is blown from around the discharge electrode to convey the ions toward the object to be discharged. In the static eliminator that neutralizes the static eliminator,
An on-off valve for opening and closing the jet of air;
Control means for controlling opening and closing of the on-off valve and a high voltage applied to the discharge electrode,
The on-off valve is opened for a period synchronized with a single period or a plurality of consecutive periods with the application of one cycle of the high voltage of the positive and negative electrodes as a basic unit, and one valve opening period and the next valve opening period The neutralization device is characterized in that the opening / closing control of the opening / closing valve is executed by intermittent air ejection control in which an interval period for closing the opening / closing valve is provided. The air supplied from the air source through the on-off valve is ejected from around the discharge electrode, and a high voltage is applied to the discharge electrode to alternately generate positive ions and negative ions, from the air source In the static eliminator for carrying out the static elimination of the charge removal object by conveying ions toward the charge removal object by the supplied air,
Control means for controlling opening and closing of the on-off valve and a high voltage applied to the discharge electrode;
The on-off valve is opened for a period synchronized with a single period or a plurality of consecutive periods with the application of one cycle of the high voltage of the positive and negative electrodes as a basic unit, and one valve opening period and the next valve opening period The neutralization device is characterized in that the opening / closing control of the opening / closing valve is executed by intermittent air ejection control in which an interval period for closing the opening / closing valve is provided. A period of a single basic unit or a plurality of consecutive basic units is set, with the interval period as a basic unit of a high voltage application period of positive electrode or negative electrode included in one cycle of high voltage application of positive electrode and negative electrode, The static elimination apparatus of Claim 1 or 2. When a control end request signal indicating the end of static elimination control is input to the control means, a positive or negative high voltage applied to the discharge electrode at the time when the control end request signal is input is applied. The control is continued, and high voltage application end control is executed to end the application of the high voltage to the discharge electrode when the control to apply the high voltage of the positive electrode or the negative electrode to the discharge electrode is completed. 4. The static eliminator according to any one of 3 above. When a control end request signal indicating the end of static elimination control is input to the control means, the discharge is performed at the time when the high voltage control of the cycle being executed at the time when the control end request signal is input is completed. The static elimination apparatus as described in any one of Claims 1-3 by which the high voltage application completion | finish control which complete | finishes the application of the high voltage with respect to an electrode is performed. When a control end request signal indicating the end of static elimination control is input to the control means, after the high voltage control of the positive electrode or the negative electrode that is being executed at the time when the control end request signal is input, High voltage application end control is executed to execute the control to apply the high voltage of the other polarity to the discharge electrode, and to end the application of the high voltage to the discharge electrode when the high voltage control of the other polarity is completed. The static elimination apparatus as described in any one of Claims 1-3. When a control end request signal indicating the end of charge removal control is input to the control means, the control means is generated by applying a high voltage to the discharge electrode without immediately ending the high voltage control on the discharge electrode. The high voltage application end control for gradually reducing the amount of ions to be generated is executed, and when the high voltage application end control is completed, the application of the high voltage to the discharge electrode is ended. The static eliminator described in the paragraph. When a control end request signal indicating the end of charge removal control is input to the control means, in the high voltage application end control, the on-off valve is opened during a period synchronized with at least one cycle of the high voltage application. The static elimination apparatus as described in any one of Claims 4-7. When the opening / closing control of the on / off valve at the time when the control end request signal indicating the end of the charge removal control is input to the control means is the interval period, the on / off valve is closed during the high voltage application end control. The static elimination apparatus as described in any one of Claims 4-7 with which a valve state is continued.

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