EP1046918A2 - Procédé et circuit pour le control de sécurité d'un dispositif de pulvérisation électrostatique - Google Patents

Procédé et circuit pour le control de sécurité d'un dispositif de pulvérisation électrostatique Download PDF

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Publication number
EP1046918A2
EP1046918A2 EP00107319A EP00107319A EP1046918A2 EP 1046918 A2 EP1046918 A2 EP 1046918A2 EP 00107319 A EP00107319 A EP 00107319A EP 00107319 A EP00107319 A EP 00107319A EP 1046918 A2 EP1046918 A2 EP 1046918A2
Authority
EP
European Patent Office
Prior art keywords
value
voltage
high voltage
storage system
energy storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00107319A
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German (de)
English (en)
Other versions
EP1046918A3 (fr
Inventor
Manfred Luderer
Olav Schnier
Thomas Raissle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schnier Elektrostatik GmbH
Original Assignee
Schnier Elektrostatik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schnier Elektrostatik GmbH filed Critical Schnier Elektrostatik GmbH
Publication of EP1046918A2 publication Critical patent/EP1046918A2/fr
Publication of EP1046918A3 publication Critical patent/EP1046918A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a method and a circuit arrangement for security check one with high voltage operated electrostatic spraying system.
  • Spray organs known to a high-voltage supply system connected, which essentially consists of one in the High voltage generators usually located in a spray booth and control electronics arranged outside the cabin consists.
  • the cabin is during the flocking or Coating company inaccessible and can usually only be entered after switching off the high voltage.
  • the problem here is that when switching off in the the system previously fed to the high-voltage generator considerable charge energy is still stored.
  • the relevant energy storage system consists of the or the the spray organs connected to the high voltage generator or their electrodes, possibly the one charged via the spray element Material supply system and the other with the spray organ Conductively connected live parts of the system.
  • the object of the invention is to create technical means to determine whether after switching off the high voltage an electrostatic spray system is a safe condition has entered, an entrance into the spray organs containing room without the described accident and / or Risk of short circuit allowed.
  • the invention relates both to a method and to a circuit arrangement for the safety check of an electrostatic spraying system operated at high voltage, which stores electrical energy in the system during operation, the elements of the spraying device which are connected to high voltage and the components which are electrically conductively connected to them during operation and during breaks in operation contains the system, the system having means for discharging the energy storage system during breaks in operation after the high voltage has been switched off into a state in which the energy still stored is not higher than a residual value E z predetermined as non-hazardous.
  • the value C of the electrical capacitance of the energy storage system is determined in the method, and after the high voltage has been switched off, the actual value U i of the voltage still present on the energy storage system is measured. Using this actual value U i it is checked whether the safety condition 1 ⁇ 2CU i 2nd ⁇ E e.g. is satisfied.
  • the circuit arrangement according to the invention contains input circuits for providing a first variable U i , which represents the actual value of the voltage applied to the energy storage system, a second variable C, which represents the value of the electrical capacitance of the energy storage system, and a third variable E z , which is given as non-hazardous Represents residual energy value. Also provided is a processing circuit which can be activated after the high voltage has been switched off and which, when the three variables U i , C and E z are combined, supplies a signal which indicates whether the safety condition 1 ⁇ 2CU i 2nd ⁇ E e.g. is satisfied.
  • the result of this test can be used to generate an alarm signal or a signal preventing access to the spray booth.
  • This concept offers security against accidents and fire-causing Short circuits even when the energy discharge circuits the spray system fail or for example because of high previous operating voltage not provided in a The period works sufficiently.
  • a simple checking unit a very significant improvement in accident safety achieved in electrostatic spraying systems.
  • An important additional advantage is that the monitoring of the Safety shutdown, i.e. ensuring access, for example in a spray booth without risk of being too high Residual charge energy, constantly or continuously and without anyone Intervention in normal plant operation can.
  • the checking unit can also the monitoring described in the patent application DE 198 16 140.9 or checking the function of an automatic Switching off the high voltage if the Carry out operating current, whereby actual current values and / or Actual voltage values of the high voltage generator through test signals be simulated by the high voltage control be supplied independently of the high voltage generator.
  • High voltage generator 1 is a high voltage generator 1, which is conventional from a cascade with associated electronics and one High voltage transformer can exist at its high voltage output 2 connected to a sprayer (not shown).
  • the control circuit 4 can be outside of a Spray booth can be arranged while the high voltage generator 1 usually near the associated spraying device located inside the cabin.
  • the from the high voltage generator 1 and the control circuit 4th existing high-voltage supply system is being used by a 10 designated superordinate control of the spray system controlled and has an input 11 for this purpose High voltage switching signal and inputs 12 and 13 for current and Voltage setpoints. Furthermore, the control circuit 4 has one Output 15, at which it is sent to the controller 10 in the event of a fault, especially when a predetermined operating current threshold value is exceeded, supplies a shutdown signal.
  • test or verification unit 20 For the security check of the high-voltage supply system serves a test or verification unit 20, which with the inputs 12 and 13 and the output 15 of the control circuit 4 connected Inputs 12 ', 13' and 15 'as well as with inputs 6, 7 has connected outputs 6 ', 7'.
  • the one from the higher-level control 10 upcoming setpoints for voltage and current are from the Checking unit 20 queried, which is now the voltage setpoint supplies the control circuit 4 at the input 7 as the actual value, so that the generation of a sufficient one for the high-voltage control High voltage simulated by the high voltage generator becomes.
  • the high voltage generator 1 can be checked be switched off.
  • the high voltage generator 1 coming current actual value at input 6 of control circuit 4 by a test signal generated by the checking unit 20 replaced.
  • This signal simulating the current actual value is from Starting from zero or a very small current value preferably continuously ramped up to a size at which the Control circuit as on a real overcurrent signal from the high voltage generator the relevant fault reports accordingly and generates the corresponding switch-off signal at output 15.
  • the checking unit 20 receives the switch-off signal at its input 15 ' received, it saves the data from your simulated actual current value. This value is compared with the current setpoint compared at the input 12 '. If the result of the Comparison lies within an adjustable "window", the checking unit reports flawlessly at further outputs 21 Function of the high voltage supply system.
  • An alarm signal can also be generated if no switch-off signal appears at input 15 ', although the test signal up to an adjustable, the setpoint essential exceeding the maximum value.
  • the described start-up of the test signal can be done manually or done automatically.
  • the checking unit 20 in the essential one according to the desired test signal as well voltage controllable by the shutdown signal at input 15 ', Current or signal generator, the output of which is e.g. the input 6 of the control circuit 4 and the other one Input of a comparator (not shown) is fed, which this signal with that applied to its second input Current setpoint from input 12 'is compared.
  • the output signal of the comparator can serve as an alarm signal.
  • control circuit 4 receives the actual values U i and I i of the voltage and applied to the spraying element (not shown) at the output 2 from the high-voltage generator 1, likewise via the checking unit 20 ′, via the lines 27, 26 of the stream.
  • control circuit 4 supplies the high-voltage generator 1 at its input connection 28 with the required operating current via its output connection 25 and via the unit 20 ′.
  • the control circuit 4 and the high voltage generator 1 form a closed control loop.
  • the actual values of the output current can and the voltage of the high voltage generator 1 in are simulated by test signals in the manner described above, to artificially force shutdowns during the High voltage generator 1 from its control circuit 4 and the supply at the input connection 28 separated, that is is switched off.
  • the checking unit 20 'contains according to the invention a circuit for determining the residual energy, according to the manual or a shutdown caused by a fault High-voltage generator 1 remains in the energy storage system, the spraying device connected to output 2 or its high voltage electrodes and all hereby electrical Conductively connected components of the system including, if necessary of the material feed system contains that in the previous Operation had been put on high voltage.
  • the energy storage system must be switched off the high voltage be discharged so that the stored Energy from its occurring in normal operation Maximum value within a prescribed time of, for example two seconds to a safe residual energy value decreases, which at the most according to current regulations Should be 350 mWs.
  • the checking unit 20 'at the output 31 should be a warning or, for example, to block access generate usable signal to the spray booth if the residual energy after the selected safety period after switching off the high voltage is, for example, two seconds higher than the stated value of 350 mWs.
  • the checking unit 20 'contains a timer 33 which is switched on at an input 32 by a signal generated at the same time as the high-voltage generator 1 is switched off and reports the expiry of the selected time period (for example 2 seconds) to a comparator 34 at its output.
  • the comparator 34 compares the continuously measured output voltage U i of the high-voltage generator 1, which corresponds to the actual actual voltage of the energy storage system, with the permissible voltage value U z . If the actual voltage value U i , which is supplied in the case shown in FIG. 2 from the high-voltage generator 1 via its output connection 47, exceeds the value U z , the aforementioned alarm and / or switching signal is generated at the output 31.
  • the time of the comparison is based on the respective Practical requirements chosen. If plant-related Result in changes in the energy storage system under consideration, it is only necessary to consider the total capacity of this System measure again and the residual energy determination circuit to re-calibrate the checking unit 20 'accordingly.
  • the timer 33 is preferably adjustable, for example in 50 ms steps in the range from 0 to 12.75 seconds.
  • the comparator 34 can also be controlled in such a way that it (at the latest) immediately after the high voltage has been switched off compares the actual voltage value U i with the permissible value U z and generates the alarm or access blocking signal at the output 31 until U i has dropped to the value U z .
  • the voltage value U z can be calculated and entered in any manner automatically or by the staff before the start of operation.
  • a relevant computing device can be provided in the higher-level control unit 10, which for this purpose can also have input means for the variables E z and C and output means for the calculated variable U z (not shown in FIG. 2).
  • FIG. 3 shows a development of the embodiment according to FIG. 2, supplemented by means for displaying the actual value E i of the stored energy and special means for automatically measuring the electrical capacity C of the energy storage system and for providing the comparison variable U z , which is the permissible voltage represents.
  • the comparator 34 receives the variable U z from a first arithmetic unit 40 arranged in the unit 20 'and the value from two input variables E z and C.
  • Uz (2E e.g. / C) 1/2 calculated and saved at their output.
  • the size E z is set at an input 41, corresponding to the value which is specified as the permissible residual energy for access to the spray booth (for example 350 mWs).
  • the variable C is supplied by a capacitance measuring device 70, which measures the electrical capacitance of the energy storage system and for this purpose is preferably connected between the high-voltage output 2 and earth.
  • the capacitance value C can be measured before the spray system starts operating and then stored in a suitable storage device (not shown) at the relevant input of the computing circuit 40.
  • the capacitance measuring device 70 can then be switched off for the duration of the spraying operation and for the time thereafter or can be uncoupled from the high-voltage output and / or from the unit 20 '.
  • a second computing device 50 and a display 60 are provided in a development of the invention.
  • the result of this arithmetic operation is visibly shown on the display 60 in mWs units.
  • the display can take place continuously in order to be able to continuously monitor the actual value E i of the stored energy.
  • measures can also be taken to specifically display and "freeze" the value that the size E i assumes at the time of expiration of the time period set by the timer 33 (for example 2 seconds after the high voltage has been switched off); this is symbolized in FIG. 3 by the dashed signal connection from the output of the timer 33 to the display 60.
  • the comparator 34 can be used to apply the quantity E i calculated by the computing device 50 and the quantity E z input at the input 41 to determine whether it is fulfilled or not the safety condition by directly comparing these two quantities.
  • the computing device 40 can be omitted in this case.
  • the elements 33 to 50 described above are preferably implemented by a microcontroller provided in the unit 20 ', which digitally processes the variables U i , U z , E i , E z and C, for example as 8-bit signals, and suitable for this A / D converter (not shown) contains.
  • the measured values for U i and C at the corresponding inputs of the unit 20 ' were provided as analogue low-voltage DC signals for the A / D conversion, for example by suitably dimensioned transmitters (not shown) which are used in the high-voltage generator 1 or can be contained in the capacitance measuring device 70.
  • the transmitters were calibrated so that an actual high-voltage value of 2.55 kV and a capacitance value of 25.5 nF each corresponded to a 5 V DC signal.
  • FIGS. 4 and 5 are Elements of the processing circuit checking the residual energy housed in a combined checking unit 20 ', which also (not shown) elements for the Checks the safety shutdown of the high voltage contains. In other embodiments, any or all of them Instead, elements of the processing circuit according to the invention housed in the higher-level control unit 10 become. Examples of this are shown in FIGS. 4 and 5.
  • the processing circuit shown in FIG. 2 which includes the timer 33 and the comparator 34, is incorporated in the higher-level control circuit of the arrangement shown in FIG. 1.
  • the actual value U i of the high voltage is derived from the high voltage output 2, where the discharge resistor 30 is also connected, and is applied to the comparator 34 contained in the supplementary superordinate control unit 10 ', which receives the calculated value U z as a second comparison variable and that Alarm or access blocking signal to the output terminal 31.
  • the higher-level control unit of the arrangement shown in FIG. 1 contains a microcontroller 80, which not only takes over the functions of this unit for checking the safety shutdown of the high voltage described above, but also the functions described in FIG. 3 processing circuit shown (elements 31-50) for checking the residual energy.
  • the actual value U i of the high voltage is derived from the high-voltage output 2 and, together with the capacitance measured value C obtained from the measuring device 70 and the preset value E z of the maximum permissible residual energy, is given for processing, in this case to the microcontroller 80 in the correspondingly equipped higher-level control unit 10 '. From this, the microcontroller 80 obtains the alarm or access blocking signal and sends it to the output connection 31. Similar to the case in FIG. 3, the actual value E i of the residual energy can also be determined by means of the microcontroller 80 and displayed on a separate display (not shown) become.
  • Embodiments can all or selected parts of the Processing circuit monitoring residual energy in a similar manner Way in the higher-level control circuit 10 of the in Fig. 2 arrangement shown. Further be mentions that a circuit arrangement according to the invention, which exceeding or falling below the permissible residual energy Switching off the high voltage checks, of course also separately and regardless of the existence of a test system for the Safety shutdown can be provided.

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  • Electrostatic Spraying Apparatus (AREA)
EP00107319A 1999-04-06 2000-04-04 Procédé et circuit pour le control de sécurité d'un dispositif de pulvérisation électrostatique Withdrawn EP1046918A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999115374 DE19915374A1 (de) 1999-04-06 1999-04-06 Verfahren und Schaltungsanordnung zur Sicherheitsüberprüfung einer elektrostatischen Sprühanlage
DE19915374 1999-04-06

Publications (2)

Publication Number Publication Date
EP1046918A2 true EP1046918A2 (fr) 2000-10-25
EP1046918A3 EP1046918A3 (fr) 2001-11-28

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Application Number Title Priority Date Filing Date
EP00107319A Withdrawn EP1046918A3 (fr) 1999-04-06 2000-04-04 Procédé et circuit pour le control de sécurité d'un dispositif de pulvérisation électrostatique

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EP (1) EP1046918A3 (fr)
DE (1) DE19915374A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080124A3 (fr) * 2001-03-30 2002-12-05 Grupo Ormazabal Sa Systeme d'alarme sonore de prevention de mise a la terre dans des cellules haute tension
EP1394913A2 (fr) * 2002-07-26 2004-03-03 NCR International, Inc. Appareil et procédé de commande d'accès a une armoire électrique
EP1250962A3 (fr) * 2001-04-20 2005-03-16 Dürr Systems GmbH Procédé de commande du fonctionnement d'une installation de revêtement électrostatique
DE102011004024A1 (de) * 2011-02-14 2012-08-16 Illinois Tool Works Inc. Steuervorrichtung für eine Pulversprühbeschichtungseinrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107424265A (zh) * 2017-07-25 2017-12-01 东莞市捷辉智能科技有限公司 人体静电阻值esd测试系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526013C1 (de) * 1985-07-20 1986-10-23 Ransburg Gmbh, 6056 Heusenstamm Beschichtungskabinen - Erdungsanlage
DE3709509A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Ueberwachungssystem fuer eine elektrostatische beschichtungsanlage
US5073709A (en) * 1991-04-09 1991-12-17 Graco Inc. Electrostatic spray applicator with two-channel optical monitoring system
US5847945A (en) * 1995-07-10 1998-12-08 Sames S.A. Processes, device for producing a high voltage and installation for electrostatic spraying of a coating product

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526013C1 (de) * 1985-07-20 1986-10-23 Ransburg Gmbh, 6056 Heusenstamm Beschichtungskabinen - Erdungsanlage
DE3709509A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Ueberwachungssystem fuer eine elektrostatische beschichtungsanlage
US5073709A (en) * 1991-04-09 1991-12-17 Graco Inc. Electrostatic spray applicator with two-channel optical monitoring system
US5847945A (en) * 1995-07-10 1998-12-08 Sames S.A. Processes, device for producing a high voltage and installation for electrostatic spraying of a coating product

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080124A3 (fr) * 2001-03-30 2002-12-05 Grupo Ormazabal Sa Systeme d'alarme sonore de prevention de mise a la terre dans des cellules haute tension
EP1250962A3 (fr) * 2001-04-20 2005-03-16 Dürr Systems GmbH Procédé de commande du fonctionnement d'une installation de revêtement électrostatique
EP1394913A2 (fr) * 2002-07-26 2004-03-03 NCR International, Inc. Appareil et procédé de commande d'accès a une armoire électrique
EP1394913A3 (fr) * 2002-07-26 2005-05-25 NCR International, Inc. Appareil et procédé de commande d'accès a une armoire électrique
DE102011004024A1 (de) * 2011-02-14 2012-08-16 Illinois Tool Works Inc. Steuervorrichtung für eine Pulversprühbeschichtungseinrichtung

Also Published As

Publication number Publication date
EP1046918A3 (fr) 2001-11-28
DE19915374A1 (de) 2000-10-12

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