CN1506783A - Flux coating amount controlling system - Google Patents
Flux coating amount controlling system Download PDFInfo
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- CN1506783A CN1506783A CNA021540004A CN02154000A CN1506783A CN 1506783 A CN1506783 A CN 1506783A CN A021540004 A CNA021540004 A CN A021540004A CN 02154000 A CN02154000 A CN 02154000A CN 1506783 A CN1506783 A CN 1506783A
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- scaling powder
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Abstract
The flux coating amount controlling system includes flux nozzle, motor, pump, flow rate controlling valve and flux bin, as well as flow rate sensor and flow rate controller. The flow rate sensor has one end connected to the flux bin and is used to detect flow rate of flux and convert it into feedback voltage signal to the flow rate controller. The flow rate controller is used to receive the feedback voltage signal, complete the logic operation of the feedback btg signal and output a control voltage to drive the motor. The system of the present invention completes closed-loop control and has control precision and stability higher than that of available open-loop system and good operation performance.
Description
Technical field
The present invention relates to the manufacturing technology of circuit board in the electronic product, refer to a kind of scaling powder coated weight control system especially.
Background technology
Along with the continuous development of electronic technology, the integrated level of product is more and more higher, and for reducing the volume of product, industry all is welded to various electronic components on the printed circuit board (PCB) now, forms the circuit board of a charged sub-element.
In the manufacture process of circuit board, can electronic component be welded on the printed circuit board (PCB) by the wave-soldering technology.But in traditional wave-soldering technology, because the coated weight of scaling powder is very big, if so do not clean, then its residue is dissociated into free son easily under certain temperature and damp condition, mobile galvanic corrosion and the ELECTROMIGRATION PHENOMENON of causing at effect of electric field downstream ion, and then make solder joint and printed circuit board (PCB) corrosion, and severe patient may cause solder joint loosening, and circuit board lost efficacy; If clean, then increase production cost again, reduce production efficiency.So how to realize scaling powder coated weight control moderate, make after welding is finished can disposable circuit board exempt from that to clean wave-soldering technology be the problem that industry need solve.
Exempt to clean in the wave-soldering technology existing, the most frequently used is finishes control and coating work to the scaling powder coated weight by atomizing scaling powder application system, to reach the purpose of exempting to clean.Concrete application mode is as follows:
Figure 1 shows that existing atomizing scaling powder application system, the mode of control scaling powder discharge rate has following two kinds in this system:
First kind: adopt a normal voltage pushing motor and drag pump, be used again one manually the flow valve of control come fluid flow in the pilot piping, to reach the purpose of control scaling powder coated weight;
Second kind: adopt a series of potential difference pushing motor that waits, come the delivery rate of control pump, to reach the purpose of control scaling powder coated weight by controlling rotating speed of motor.
Though aforesaid way has obtained utilization widely, has following shortcoming:
1, system is open loop control, so the control accuracy of scaling powder coated weight is not good, the fluctuation range in a work moon reaches 20% unexpectedly;
2, because fluctuation range is big, add that the method that level control is arranged is adopted in the control of scaling powder flow, so the coated weight gap of every inter-stage is big, when modulating, technology is difficult to find optimum, operability is very poor;
3, in manufacture process, for remedying above-mentioned defective, often need be according to actual conditions adjusting process and device parameter setting repeatedly, cause technological process instability, supplementary product onsumption is excessive, problems such as possibility increase appear in the production defective appearance.
Summary of the invention
The invention provides a kind of scaling powder coated weight control system, to solve the not high problem of control accuracy that prior art exists.
For addressing the above problem, a kind of scaling powder coated weight control system of the present invention, comprise the scaling powder shower nozzle, motor, pump, flowrate control valve, the scaling powder storehouse, the input end of described scaling powder shower nozzle is connected to the output terminal of flowrate control valve, the input end of described flowrate control valve then links to each other with the scaling powder storehouse, it is characterized in that, also comprise a flow sensor and a flow controller, with described motor, pump, a closed loop is formed in flowrate control valve and scaling powder storehouse together, dynamically Control Flow output, wherein
One end of described flow sensor is connected with the scaling powder storehouse, in order to the flow of detection scaling powder, and is converted into feedback voltage signal, passes to this flow controller;
Described flow controller is used to receive above-mentioned feedback voltage signal, and described feedback voltage signal is carried out computing, exports a control voltage that is used for pushing motor at last.
Scaling powder coated weight control system of the present invention has following advantage:
1, because system is closed-loop control,, greatly improved the control accuracy of scaling powder coated weight so solved the not high problem of open loop control accuracy in the prior art;
2, because system is closed-loop control, so, also have the advantage of good stability compared to open-loop control system;
3, because closed-loop control system can be fed back the fluctuation situation of flow in time, thus when engineer testing and production technology modulation, can find optimum in time, and then there is the advantage of good operability in system of the present invention compared to open cycle system of the prior art.
Description of drawings
Fig. 1 is the system block diagram of existing atomizing scaling powder application system;
Fig. 2 is the system block diagram of scaling powder coated weight control system of the present invention;
Embodiment
In order to allow those skilled in the art better understand the present invention, further describe the present invention below in conjunction with embodiment.
Please refer to shown in Figure 2, scaling powder coated weight control system of the present invention comprises three parts: scaling powder flow I/O part, control section and control setting section, wherein I/O partly is scaling powder shower nozzle 201 and scaling powder storehouse 207, and described scaling powder shower nozzle 201 its flow input ends link to each other with control section and export the scaling powder flow of setting; Control section comprises flowrate control valve 202, motor 203, pump 204, flow sensor 205 and flow controller 206, a closed loop is formed in they and scaling powder storehouse 207 together, be responsible for the scaling powder flow size of output in the control scaling powder storehouse 207, wherein, described flowrate control valve 202 links to each other with pump 204, also have an end to link to each other with scaling powder shower nozzle input end, other has an end to be connected with scaling powder storehouse 207, finishes the blocked operation of scaling powder liquid stream between skimmer circuit and scaling powder shower nozzle 201; The control setting section comprises that programmable logic controller (PLC) (PLC) 208 and touches control flow 209, mainly finishes the setting of control section parameter.
Concrete, further specify the effect of each parts among the present invention, a flow sensor 205 and a flow controller 206 have been added at control section among the present invention, described flow sensor 206 1 ends are connected with scaling powder storehouse 207, be mainly used in real-time detection scaling powder flow size, and with its corresponding feedback voltage signal that is converted into, its other end then links to each other with described flow controller 206, above-mentioned feedback voltage signal is passed to this flow controller 206, this flow controller 206 receives behind the feedback voltage signal by logical operation, and output one control voltage pushing motor 203 drags pump 204 and finishes predetermined amount of flow output.
The programmable logic controller (PLC) of control setting section of the present invention in addition (PLC) 208 be mainly used in the normal voltage that receives input or etc. potential difference, and and touch control flow 209 and be electrically connected, process window data according to user's appointment, the coated weight working range of definition scaling powder application system this moment, and export a control signal to above-mentioned flow controller 206, and touch control flow 209, then finish the setting of the coated weight working range of scaling powder application system in the programmable logic controller (PLC) 208, flow controller 206 running parameters are set, and show flow in real time, functions such as input and output voltage.
Preferably, our described flow sensor 205 is one to stream the formula sensor in the embodiment of the present invention, and described flow controller 206 is a PID controller, and described flowrate control valve 203 is a solenoid directional control valve.
Following mask body describes the workflow of embodiment of the present invention scaling powder coated weight control system in detail, the user is after having set the coated weight working range and set the running parameter of described PID controller on the touch control flow, system starts working, above-mentioned programmable logic controller (PLC) receives an operating voltage, and the coated weight working range of setting according to the user, export a control signal and give the PID controller, the PID controller after receiving this control signal through logical operation, output one control voltage is given motor, is finally finished the output of predetermined amount of flow by the motor driving pump.Optimize, a closed loop has been formed in flow sensor, PID controller, motor, pump, flowrate control valve and scaling powder storehouse together among the present invention, the dynamically output of Control Flow, concrete, flow sensor detects the size of flow in the scaling powder storehouse in real time, and be translated into a feedback voltage signal and pass to the PID controller, after the PID controller is received this feedback voltage signal, through logical operation, export a new control voltage and drag pump to motor, between scaling powder shower nozzle and skimmer circuit, switch the flow of control scaling powder output again by above-mentioned flowrate control valve.Therefore, among the present invention when flow changes closed-loop control part adjust very soon according to the flow rate fluctuation information of feedback, the precision of scaling powder output is very high like this, operability and stability open loop are than before controlled large increase.
The above only is a preferred implementation of the present invention; be not limited to claim scope of the present invention; any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (5)
1, a kind of scaling powder coated weight control system, comprise scaling powder shower nozzle, motor, pump, flowrate control valve, scaling powder storehouse, the flow input end of described scaling powder shower nozzle links to each other with flowrate control valve, described flowrate control valve then links to each other with the scaling powder storehouse, it is characterized in that, also comprises a flow sensor and a flow controller, form a closed loop together with described motor, pump, flowrate control valve and scaling powder storehouse, dynamically Control Flow output, wherein
One end of described flow sensor is connected with the scaling powder storehouse, in order to the flow of detection scaling powder, and is converted into feedback voltage signal, passes to flow controller;
Described flow controller is used to receive above-mentioned feedback voltage signal, and described feedback voltage signal is carried out logical operation, exports a control voltage that is used for pushing motor at last.
2, scaling powder coated weight control system as claimed in claim 1, it is characterized in that: described scaling powder coated weight control system also comprises a touch control flow, and described touch control flow is used to set the coated weight scope, set the running parameter of flow controller, show flow, the input and output voltage of scaling powder in real time.
3, scaling powder coated weight control system as claimed in claim 1, it is characterized in that: described scaling powder coated weight control system also comprises a programmable logic controller (PLC), the output terminal of the input end of described programmable logic controller (PLC) and described touch control flow electrically connects, be used for acceptance criteria voltage and wait potential difference, and according to exporting a control signal from the data of described touch control flow to described flow controller.
4, as claim 1 or 2 or 3 described scaling powder coated weight control system, it is characterized in that: described flowrate control valve is a solenoid directional control valve.
5, scaling powder coated weight control system as claimed in claim 1, it is characterized in that: described flow controller is the PID controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154000 CN1231824C (en) | 2002-12-09 | 2002-12-09 | Flux coating amount controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02154000 CN1231824C (en) | 2002-12-09 | 2002-12-09 | Flux coating amount controlling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1506783A true CN1506783A (en) | 2004-06-23 |
| CN1231824C CN1231824C (en) | 2005-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02154000 Expired - Fee Related CN1231824C (en) | 2002-12-09 | 2002-12-09 | Flux coating amount controlling system |
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| Country | Link |
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| CN (1) | CN1231824C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615376A (en) * | 2012-03-30 | 2012-08-01 | 珠海晶英科技有限公司 | Programmable atomizer and control method thereof |
| CN102820107A (en) * | 2012-09-05 | 2012-12-12 | 江苏亨通高压电缆有限公司 | Adjustable scrapable high-voltage cable pitch coating device |
| CN103934540A (en) * | 2014-05-12 | 2014-07-23 | 珠海格力电器股份有限公司 | Soldering flux flow control device and method |
| CN104133389A (en) * | 2012-03-30 | 2014-11-05 | 珠海晶英科技有限公司 | Programmable sprayer and control method thereof |
| CN104881052A (en) * | 2015-06-23 | 2015-09-02 | 佛山市飞凌皮革化工有限公司 | Flow intermittence closed-loop control method and special device for solvent-free synthetic leather feeding machine |
| CN109072749A (en) * | 2016-05-13 | 2018-12-21 | 瓦锡兰芬兰有限公司 | The method for controlling reducing agent injection for the emission-reducing system for internal combustion engine |
| CN111857191A (en) * | 2019-04-25 | 2020-10-30 | 北大方正集团有限公司 | Method, device and equipment for controlling liquid medicine in circuit board manufacturing process and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764039B (en) * | 2008-12-23 | 2011-09-14 | 王兆安 | Light bulb machine photoelectric sensing soldering paste automatic liquid-applying device |
| CN103676982A (en) * | 2013-12-23 | 2014-03-26 | 交通运输部天津水运工程科学研究所 | Water flow rate control device of geotechnical centrifuge |
-
2002
- 2002-12-09 CN CN 02154000 patent/CN1231824C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615376A (en) * | 2012-03-30 | 2012-08-01 | 珠海晶英科技有限公司 | Programmable atomizer and control method thereof |
| CN104133389A (en) * | 2012-03-30 | 2014-11-05 | 珠海晶英科技有限公司 | Programmable sprayer and control method thereof |
| CN102820107A (en) * | 2012-09-05 | 2012-12-12 | 江苏亨通高压电缆有限公司 | Adjustable scrapable high-voltage cable pitch coating device |
| CN103934540A (en) * | 2014-05-12 | 2014-07-23 | 珠海格力电器股份有限公司 | Soldering flux flow control device and method |
| CN103934540B (en) * | 2014-05-12 | 2016-08-17 | 珠海格力电器股份有限公司 | Scaling powder volume control device and method |
| CN104881052A (en) * | 2015-06-23 | 2015-09-02 | 佛山市飞凌皮革化工有限公司 | Flow intermittence closed-loop control method and special device for solvent-free synthetic leather feeding machine |
| CN109072749A (en) * | 2016-05-13 | 2018-12-21 | 瓦锡兰芬兰有限公司 | The method for controlling reducing agent injection for the emission-reducing system for internal combustion engine |
| CN111857191A (en) * | 2019-04-25 | 2020-10-30 | 北大方正集团有限公司 | Method, device and equipment for controlling liquid medicine in circuit board manufacturing process and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1231824C (en) | 2005-12-14 |
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