CN1982900B - Grounding inspector and electrostatic spraying system - Google Patents
Grounding inspector and electrostatic spraying system Download PDFInfo
- Publication number
- CN1982900B CN1982900B CN2005100223369A CN200510022336A CN1982900B CN 1982900 B CN1982900 B CN 1982900B CN 2005100223369 A CN2005100223369 A CN 2005100223369A CN 200510022336 A CN200510022336 A CN 200510022336A CN 1982900 B CN1982900 B CN 1982900B
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- Prior art keywords
- electric conductor
- workpiece
- circuit
- detection device
- hanger
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- 238000007590 electrostatic spraying Methods 0.000 title description 6
- 239000004020 conductor Substances 0.000 claims abstract description 44
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000009503 electrostatic coating Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 14
- 239000003973 paint Substances 0.000 description 9
- 239000007921 spray Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Electrostatic Spraying Apparatus (AREA)
Abstract
A static spraying system with grounding-detection unit is prepared as fixing all hanging tools on conveying chain to move said hanging tools in following said conveying chain; electric-connecting said conveying chain to grounding unit; series-connecting reference voltage generating circuit, sampling circuit and conductor in sequence; contacting said conductor with workpiece and connecting processing circuit to sampling circuit.
Description
[technical field]
The present invention relates to electrostatic spraying apparatus, relate in particular to a kind of electrostatic spraying apparatus that has the workpiece grounding detection system.
[background technology]
Developing rapidly the requirement of coating quality of modern industry is more and more higher.General brushing and spray efficiency are low, and paint waste is many, and coating quality is bad, and electrostatic spraying can overcome above shortcoming.Compare with spraying with general brushing, electrostatic spraying efficient height, paint waste is few, seldom has paint to fly upward in the air, has improved working environment.In the electrostatic coating system, the approach of coated article ground connection is usually: workpiece (promptly by spray) → hanger → carrier chain → metal support → ground connection.But in process of production, owing to easily adhere to coating on the hanger, and owing to use coating long-pending more thick more repeatedly, thereby the tie point place of hanger and workpiece conduction is bad, and produce the bad phenomenon of ground connection effect.
If metal works imperfect earth in electrostatic spray process, equally also can cause the utilization factor of coating low, paint waste is many, influence the quality of coating efficiency and coating, cause very big pressure to recovery system, make unnecessary coating have little time to reclaim and elegant outside spray booth, both wasted coating, worsened the environment of operation room again.Because ground connection is bad, coating is attached to accumulating electric charge easily on the workpiece, when people and other ground connection thing with its near to or in contact with the time, the danger of generation spark discharge is arranged.
[summary of the invention]
Fundamental purpose of the present invention is exactly to provide a kind of ground detection device in order to solve problems of the prior art, and ground connection situation that can online detection workpiece is got rid of the fault that causes imperfect earth as early as possible, and it is good to make workpiece remain ground connection.
Another object of the present invention is exactly to provide a kind of electrostatic coating system in order to solve problems of the prior art, and ground connection situation that can online detection workpiece is got rid of the fault that causes imperfect earth as early as possible, and it is good to make workpiece remain ground connection.
For achieving the above object, a kind of ground detection device that the present invention proposes, comprise reference voltage generating circuit, sample circuit, electric conductor and be used to calculate the treatment circuit of outer meeting resistance value, described reference voltage generating circuit, sample circuit and electric conductor are connected in proper order, described electric conductor is used to contact detected material, described treatment circuit comprises rectification unit, A/D converter and the outer meeting resistance processing unit that order links to each other, described rectification unit is connected the two ends of sampling resistor, and described rectification unit links to each other with sample circuit.
Wherein the preferred version of each several part is as follows:
Described sample circuit is a sampling resistor, and described electric conductor is a flexible electrical conductors.
Described outer meeting resistance processing unit comprises Programmable Logic Controller, and described rectification unit is the precision rectifying unit.
Described reference voltage generating circuit is a sine-wave generator.
For achieving the above object, the present invention also proposes a kind of electrostatic coating system, comprise the hanger that is used to hang workpiece, carrier chain and earthing device, described hanger is fixed on the carrier chain and with carrier chain and moves, described carrier chain and earthing device are electrically connected, also comprise ground detection device, described ground detection device comprises reference voltage generating circuit, sample circuit, electric conductor and the treatment circuit that is used to calculate the outer meeting resistance value, described reference voltage generating circuit, sample circuit and electric conductor are connected in proper order, described electric conductor is used for contact workpiece, described treatment circuit comprises the precision rectifying unit that order links to each other, A/D converter and outer meeting resistance processing unit, described precision rectifying unit is connected the two ends of sampling resistor, and described precision rectifying unit links to each other with sample circuit.
Wherein the preferred version of each several part is as follows:
Described reference voltage generating circuit is a sine-wave generator, and described sample circuit is a sampling resistor, and described electric conductor is a flexible electrical conductors.
Described outer meeting resistance processing unit comprises scrambler and Programmable Logic Controller, and the input end of described Programmable Logic Controller links to each other with the output terminal of A/D converter and the output terminal of scrambler respectively, and the axle of described scrambler links to each other with the motor shaft machinery of electrostatic coating system.
Described electric conductor is positioned near the hanger motion track and can touches with workpiece.
The invention has the beneficial effects as follows: when the workpiece on the hanger moves along with the carrier chain direction, workpiece touches electric conductor, at this moment, the reference voltage generating circuit of ground detection device is through electric conductor → workpiece → hanger → carrier chain → earthing device, constitute a current return, gather voltage by sample circuit, calculate the external resistance of electric conductor, utilize the change in resistance of outer meeting resistance to reflect whether good electrical connects between workpiece and the hanger, perhaps whether good electrical is connected hanger with earthing device, if resistance is greater than the resistance value of setting, then illustrate between workpiece and the hanger connect connect between bad or hanger and the earthing device bad, then fault has appearred in workpiece good earth not, needs to handle.By this programme, ground connection situation that can online detection workpiece is got rid of the fault that causes imperfect earth as early as possible, for example bad hanger etc., and it is good to make workpiece remain ground connection, reduces paint waste, guarantees the quality of spraying, reduces security incident.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the functional-block diagram of ground detection device of the present invention;
Fig. 2 is the synoptic diagram of electrostatic coating system of the present invention.
[embodiment]
As shown in Figure 1, ground detection device is used for the ground connection situation of the workpiece that is sprayed is carried out online detection, and reference voltage generating circuit is a sine-wave generator 11, and the DC voltage of external+24V becomes the required various voltages of circuit through voltage transitions.The internal signal generator circuit produces the sine wave of output 100Hz, 10mA, outputs to sampling resistor 13 after amplifying through amplifier 12, connects detected material by electric conductor 14.Rectification unit 15 is connected the two ends of sampling resistor 13, the output terminal of rectification unit 15 be linked in sequence A/D converter 16 and Programmable Logic Controller 18.In order to guarantee that electric conductor contacts good with detected material and electric conductor does not damage detected material, electric conductor selects leisurely property electric conductor.When electric conductor 14 contacts with detected material, because of detected material with communicate, so from sine-wave generator 11 → sampling resistor 13 → electric conductor 14 → detected material → ground, form current path, whether ground connection is good can to judge detected material by the outer meeting resistance that calculates electric conductor 14.In order accurately to measure the resistance of outer meeting resistance, reduce the influence of 15 pairs of outer meeting resistance values of rectification unit, so adopt the very little precision rectifying unit of forward voltage.
Comprise above-mentioned ground detection device, have electrostatic coating system that the online ground connection of workpiece detects as shown in Figure 2, workpiece hangs on the hanger 3, hanger 3 is fixed on the carrier chain 1 by arm 2, carrier chain 1 is by earthing device ground connection, earthing device is a metal support 4, and promptly workpiece is by hanger 3, suspender 2, carrier chain 1, metal support 4 ground connection.Electric conductor 14 be positioned at the hanger motion track near, and can contact with near the workpiece moving to electric conductor 14.Move because of workpiece is in,, when workpiece moves to the position of electric conductor, workpiece can be contacted with electric conductor so the preferable scheme of electric conductor that is used for contacting with workpiece is to be designed to be fixed on the track that workpiece moves.Damage workpiece during for fear of the friction of electric conductor and workpiece, electric conductor uses flexible electrical conductors, for example conducts electricity soft band.When the workpiece on the hanger 3 moves along with carrier chain 1 direction, workpiece touches the soft band of conduction, at this moment, the sinusoidal ac of sine-wave generator 11 inner 100Hz constitutes the loop through electric conductor 14 → workpiece → hanger 3 → suspender 2 → carrier chain 1 → metal support 4 → ground connection.The alternating voltage at the inner sampling resistor of ground detection device 13 two ends is delivered to A/D converter 16 through inner precise rectification circuit 15, A/D converter 16 can adopt the FN2N-2AD analog-to-digital conversion module, and convert analog voltage to digital quantity and exist in the Programmable Logic Controller (PLC) 18, so that calculate the hanger resistance value, and compare with the resistance data value of setting, if the outer meeting resistance value that detects judges then that greater than the resistance data value of setting workpiece grounding is bad.Programmable Logic Controller 18 can adopt FX2N-128MT type Programmable Logic Controller.For definite which hanger of knowing has problem, present embodiment has adopted scrambler 17, scrambler 17 is an incremental encoder, its axle is connected with the shaft mechanical of carrier chain motor 19, its signal output part links to each other with Programmable Logic Controller 18, the A of scrambler 17 receives the X0 terminal of FX2N-128MT type Programmable Logic Controller mutually, and B receives FX2N-128MT type Programmable Logic Controller X1 terminal mutually.A moving week of axle revolution of scrambler 17, export a series of signal, this signal is along with the rotation period output of the axle of scrambler 17, so Programmable Logic Controller 18 can be judged the running number of turns of carrier chain motor 19 according to the signal of scrambler 17 outputs, can extrapolate the advanced positions of hanger from the running number of turns of motor, when hanger advances to the test position of the soft band of conduction, Programmable Logic Controller 18 control ground detection devices detect the ground state of workpiece, program is counted Programmable Logic Controller internal counter C251, handle by data computation high-speed counter C251, just can calculate corresponding position of each hanger and resistance value accurately, and the outer meeting resistance value of record measurement and the numbering of hanger, consult after being equipped with.
Its principle of operation is as follows:
Because VEF/REF=(V-VEF)/R
So the outer meeting resistance value is: R=REF * (V-VEF)/VEF
VEF is the sampled value of A/D converter in the following formula, and REF is the resistance value of sampling resistor, and V is the reference voltage of sine-wave generator output, and R is an outer meeting resistance.
When the soft band of first hanger process conduction, the outer meeting resistance value of the correspondence calculated is put into data register D200, when second soft band of hanger process conduction, the outer meeting resistance value of the correspondence calculated is put into data register D201, by that analogy, reach the hanger number of being left with.When the resistance that detects resistance during greater than the resistance data value set, show that promptly the contained workpiece grounding of this hanger is bad, this moment, PLC can further drive the sound light alarming circuit warning, the later resistance data of register D200 that can also can monitor by touch-screen is also cleared up as us and to be adhered to coating on the hanger or to get rid of the foundation that other cause the workpiece grounding bad error.
When first hanger once more through conduction during soft band, the detection resistance value of calculating is put into D200 once more, the resistance data in the D200 is refreshed, hanger is as long as moving like this, the resistance data of correspondence will be refreshed, thereby can realize large-scale online detection.
Effect below by description of test this programme:
Determine the bad hanger of workpiece grounding by such scheme, when insulation resistance surpasses 1M Ω between locality and the workpiece, represent that then workpiece grounding is bad.Its resistance value is as shown in table 1.
Table 1
| Measured |
1 | 2 | 3 | 4 | 5 | 6 |
| Workpiece grounding resistance (M Ω) | 2.5 | 3 | 2 | 3.5 | 5 | 3 |
Workpiece grounding is bad as can be seen from the measurement result of table 1, and this moment, main operating procedure parameter was as follows:
1 electrostatic gun electrostatic potential: 65kV
2 mist type air pressure 2.5kg/cm2
3 atomization air pressure 2.0kg/cm2
4 paint discharge-amount air pressure 1.0kg/cm2
After spraying curing end, check painting quality, 6 different workpiece, the same position point of measuring workpieces is measured its thickness, and its measurement result sees Table 2.
Table 2
| Measured |
1 | 2 | 3 | 4 | 5 | 6 |
| The workpiece thickness (micron) that sprays paint | 14 | 13 | 15 | 12 | 10 | 13 |
From the data shown in the table 2 as can be seen, coating thickness is very inhomogeneous, and there is pin hole in its outward appearance, defective such as there is aberration on the surface, and bound edge is bad.For and the workpiece that need manually fill spray complicated for shape, this kind situation is particularly serious.
Hanger ground connection is good, at this moment, under the situation that keeps the origin operation parameter, surveys the thickness of 6 different workpieces coatings, and its data are as shown in table 3.
Table 3
| Measured |
1 | 2 | 3 | 4 | 5 | 6 |
| The workpiece thickness (micron) that sprays paint | 17 | 18 | 17 | 17 | 17 | 18 |
Check paint film appearance, then can find the thick and surface smoothing, even of film thickness, defects such as glossiness is good, free of pinholes exist.
Be not difficult to find out from above experimental result, on the electrostatic spraying line, add the online ground detection device of a cover workpiece, the hanger of eliminating imperfect earth had as early as possible both improved the efficient of application, the quality of coating and the utilization factor of coating, had improved the environment of spraying operation room again.And the design cost of the online ground connection detection system of workpiece is not high, has reached the extremely excellent ratio of performance to price.
Claims (10)
1. ground detection device, it is characterized in that: comprise reference voltage generating circuit, sample circuit, electric conductor and be used to calculate the treatment circuit of outer meeting resistance value, described reference voltage generating circuit, sample circuit and electric conductor are connected in proper order, described electric conductor is used to contact detected material, described treatment circuit comprises rectification unit, A/D converter and the outer meeting resistance processing unit that order links to each other, and described rectification unit links to each other with sample circuit.
2. ground detection device as claimed in claim 1 is characterized in that: described sample circuit is a sampling resistor, and described electric conductor is a flexible electrical conductors.
3. ground detection device as claimed in claim 2 is characterized in that: described rectification unit is connected the two ends of sampling resistor.
4. ground detection device as claimed in claim 3 is characterized in that: described outer meeting resistance processing unit comprises Programmable Logic Controller, and described rectification unit is the precision rectifying unit.
5. ground detection device as claimed in claim 1 is characterized in that: described reference voltage generating circuit is a sine-wave generator.
6. electrostatic coating system, comprise the hanger that is used to hang workpiece, carrier chain and earthing device, described hanger is fixed on the carrier chain and can moves with carrier chain, described carrier chain and earthing device are electrically connected, it is characterized in that: also comprise ground detection device, described ground detection device comprises reference voltage generating circuit, sample circuit, electric conductor and the treatment circuit that is used to calculate the outer meeting resistance value, described reference voltage generating circuit, sample circuit and electric conductor are connected in proper order, described electric conductor is used for contact workpiece, described treatment circuit comprises the precision rectifying unit that order links to each other, A/D converter and outer meeting resistance processing unit, described precision rectifying unit links to each other with sample circuit.
7. electrostatic coating system as claimed in claim 6 is characterized in that: described reference voltage generating circuit is a sine-wave generator, and described sample circuit is a sampling resistor, and described electric conductor is a flexible electrical conductors.
8. electrostatic coating system as claimed in claim 7 is characterized in that: described precision rectifying unit is connected the two ends of sampling resistor.
9. electrostatic coating system as claimed in claim 8, it is characterized in that: described outer meeting resistance processing unit comprises scrambler and Programmable Logic Controller, the input end of described Programmable Logic Controller links to each other with the output terminal of A/D converter and the output terminal of scrambler respectively, and the axle of described scrambler links to each other with the motor shaft machinery of electrostatic coating system.
10. electrostatic coating system as claimed in claim 6 is characterized in that: described electric conductor is positioned near the hanger motion track and can touches with workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100223369A CN1982900B (en) | 2005-12-14 | 2005-12-14 | Grounding inspector and electrostatic spraying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100223369A CN1982900B (en) | 2005-12-14 | 2005-12-14 | Grounding inspector and electrostatic spraying system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1982900A CN1982900A (en) | 2007-06-20 |
| CN1982900B true CN1982900B (en) | 2010-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100223369A Withdrawn - After Issue CN1982900B (en) | 2005-12-14 | 2005-12-14 | Grounding inspector and electrostatic spraying system |
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| Country | Link |
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| CN (1) | CN1982900B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692550A (en) * | 2011-03-22 | 2012-09-26 | 上海华晖新材料科技有限公司 | Hook-style conductivity detecting device |
| IN2015DN02659A (en) * | 2012-10-17 | 2015-09-04 | Trinity Ind Corp | |
| CN102928730B (en) * | 2012-10-31 | 2016-01-27 | 华东光电集成器件研究所 | A kind of ground detection device |
| CN110554244A (en) * | 2019-09-20 | 2019-12-10 | 裕东（中山）机械工程有限公司 | Mobile online resistance detection system for electrostatic powder spraying |
| CN112180169B (en) * | 2020-09-28 | 2024-03-19 | 广汽本田汽车有限公司 | Lifting appliance insulation detection device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546400A (en) * | 1983-06-03 | 1985-10-08 | Robert Bosch Gmbh | Method and apparatus of protecting a coating plant against explosion |
| CN2235125Y (en) * | 1995-10-23 | 1996-09-11 | 徐裕清 | High-reliability high-stability groundmeter |
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| US6396284B1 (en) * | 2000-06-09 | 2002-05-28 | Ramcom Systems, Inc. | Ground resistance monitor |
| WO2002091003A1 (en) * | 2001-05-08 | 2002-11-14 | Sintef Energiforskning As | Contact control |
| CN2603400Y (en) * | 2003-01-28 | 2004-02-11 | 天津津安安全技术有限公司 | Automatic remote controller for electrostatic grounding |
| GB2411734A (en) * | 2004-03-06 | 2005-09-07 | Raymond John Vassie | Measuring resistance of a connection |
| EP1586910A1 (en) * | 2004-04-18 | 2005-10-19 | Deif A/S | Method of and device for insulation monitoring |
-
2005
- 2005-12-14 CN CN2005100223369A patent/CN1982900B/en not_active Withdrawn - After Issue
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546400A (en) * | 1983-06-03 | 1985-10-08 | Robert Bosch Gmbh | Method and apparatus of protecting a coating plant against explosion |
| CN2235125Y (en) * | 1995-10-23 | 1996-09-11 | 徐裕清 | High-reliability high-stability groundmeter |
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| US6396284B1 (en) * | 2000-06-09 | 2002-05-28 | Ramcom Systems, Inc. | Ground resistance monitor |
| WO2002091003A1 (en) * | 2001-05-08 | 2002-11-14 | Sintef Energiforskning As | Contact control |
| CN2603400Y (en) * | 2003-01-28 | 2004-02-11 | 天津津安安全技术有限公司 | Automatic remote controller for electrostatic grounding |
| GB2411734A (en) * | 2004-03-06 | 2005-09-07 | Raymond John Vassie | Measuring resistance of a connection |
| EP1586910A1 (en) * | 2004-04-18 | 2005-10-19 | Deif A/S | Method of and device for insulation monitoring |
Non-Patent Citations (2)
| Title |
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| 王钦若.基于单片机的电饭锅接地电阻在线测试装置.工业仪表与自动化装置1999年 第2期.1999,1999年(第2期),58-60. |
| 王钦若.基于单片机的电饭锅接地电阻在线测试装置.工业仪表与自动化装置1999年 第2期.1999,1999年(第2期),58-60. * |
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| Publication number | Publication date |
|---|---|
| CN1982900A (en) | 2007-06-20 |
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