CN103116374A - Temperature control system of reflow soldering machine - Google Patents
Temperature control system of reflow soldering machine Download PDFInfo
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- CN103116374A CN103116374A CN 201110363701 CN201110363701A CN103116374A CN 103116374 A CN103116374 A CN 103116374A CN 201110363701 CN201110363701 CN 201110363701 CN 201110363701 A CN201110363701 A CN 201110363701A CN 103116374 A CN103116374 A CN 103116374A
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Abstract
A temperature control system of a reflow soldering machine comprises a K type thermocouple, a temperature measurement module, a temperature curve setting portion, a proportion integration differentiation (PID) regulator, a controller, a driver, a programmable logic controller (PLC) actuator, a solid-state relay and a heater, wherein the temperature measurement module, the temperature curve setting portion, the PID regulator, the controller, the driver, the PLC actuator, the solid-state relay and the heater are in electric connection with the K type thermocouple in sequence. The K type thermocouple detects that current temperature is a signal of signal slow changing, the obtained real-time temperature is transmitted to the temperature measurement module, a temperature difference is calculated between a preset temperature curve and the real-time temperature, the PID regulator then conducts regulation according to the temperature difference, the PLC actuator controls the solid-state relay to control work of a heating pipe, the PLC actuator regulates the duty ratio to change effective voltages at two ends of a resistance wire, and the purpose of effective control of the temperature is achieved. Temperature control of the reflow soldering machine can be conducted according to a temperature rising state, a constant temperature state, namely a waiting state, and a working state, temperature variation of each temperature area of the reflow soldering machine can be audio-visually and conveniently observed, temperature distribution of the whole reflow soldering can be audio-visually and conveniently observed, and therefore appropriate soldering time can be chosen.
Description
Technical field
The present invention relates to a kind of temperature control system of reflow machine, particularly relate to a kind of temperature control system of reflow machine.
Background technology
Reflow machine is as a major equipment of electronic element production and attachment process production, and its correct use can further be guaranteed welding quality and product quality undoubtedly.In general, under the process conditions that are fit to, reflow soldering process has the advantage that output is high, reliability is high, cost is low, in all technological factors, it is one of most important factor that rework profile affects the weld defects rate, and in the use of reflow machine, the most difficult assurance is exactly the setting of thermal reflow profile, inappropriate temperature curve can make that element occurs that welding is complete, rosin joint, element stick up the weld defectss such as vertical, that solder ball is too much, thereby affect product quality.Therefore, the accurate control of the warm area of Reflow Soldering equipment and temperature is most important.
In industrial process, temperature variable is one of modal procedure parameter, has the characteristics such as change when non-linear, slow, large time delay, often is difficult to set up accurate mathematical model.Conventional pid control algorithm is simple, dependable performance, easily realize having good dynamic tracking quality and higher stable state accuracy.But, the control object of, parameter time varying non-linear for having and model uncertainty, conventional PID just is difficult to realize.
Summary of the invention
The shortcoming that exists in order to overcome above-mentioned prior art, the object of the present invention is to provide a kind of temperature control system of reflow machine, can to reflow machine by soaking condition, temperature constant state namely wait for, duty carries out temperature and controls, can observe intuitively, easily the temperature variation of each warm area of reflow machine and the Temperature Distribution of whole Reflow Soldering, thereby select suitable weld interval.
In order to achieve the above object, the technical solution used in the present invention is:
a kind of temperature control system of reflow machine, comprise K type thermopair, the temperature-measuring module that is electrically connected to successively with K type thermopair, the temperature curve setting part, the PID regulator, controller, driver, the PLC actuator, solid-state relay and well heater, because the temperature of Reflow Soldering can not be suddenlyd change, so it is the signal that signal slowly changes that K type thermopair detects current temperature, the real time temperature that obtains is passed to temperature-measuring module, to design temperature curve and real time temperature calculating temperature difference, PID adjusts according to the temperature difference more again at regulator, the PLC actuator is controlled the work that solid-state relay is controlled heating tube, the PLC actuator is by regulating dutycycle, thereby change the effective voltage at resistance wire two ends, reach the purpose of effective control temperature.
Described control system mainly is divided into soaking condition, temperature constant state, three states of duty.
The present invention compared with prior art has the following advantages:
1. the present invention is reasonable in design, and is simple in structure;
2. the present invention proposes a kind of in conjunction with the PID regulator with by the PLC actuator by regulate duty recently the voltage of controlling resistance silk control temperature and determine temperature curve, reach to reflow machine by soaking condition, temperature constant state namely wait for, duty carries out temperature control.
3. wherein the supervision of real time temperature curve can be observed the temperature variation of each warm area of reflow machine and the Temperature Distribution of whole Reflow Soldering intuitively, easily, thereby selects suitable weld interval.
Description of drawings
Accompanying drawing is the connection diagram of control system of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, structural principle of the present invention and principle of work are further described.
as shown in drawings, a kind of temperature control system of reflow machine, comprise K type thermopair, the temperature-measuring module that is electrically connected to successively with K type thermopair, the temperature curve setting part, the PID regulator, controller, driver, the PLC actuator, solid-state relay and well heater, because the temperature of Reflow Soldering can not be suddenlyd change, so it is the signal that signal slowly changes that K type thermopair detects current temperature, the real time temperature that obtains is passed to temperature-measuring module, to design temperature curve and real time temperature calculating temperature difference, PID adjusts according to the temperature difference more again at regulator, the PLC actuator is controlled the work that solid-state relay is controlled heating tube, the PLC actuator is by regulating dutycycle, thereby change the effective voltage at resistance wire two ends, reach the purpose of effective control temperature.
Described control system mainly is divided into soaking condition, temperature constant state, three states of duty.
The principle of work of the temperature control system of a kind of reflow machine of the present invention is: reflow machine is divided into intensification, constant temperature three states of namely waiting for, work.Under soaking condition, the control heater heating is until well heater is heated to uniform temperature; At this moment, enter constant temperature and wait for that namely pcb board passes through state, K type thermopair detects Current Temperatures, design temperature curve and current detection to temperature carry out differential thermal calculation, the PID regulator is adjusted, the PLC actuator passes through to regulate dutycycle, thereby changes the effective voltage at resistance wire two ends, reaches the purpose of effective control temperature; When entering duty, the state that namely has pcb board to pass through, this moment, the reflow machine heat dissipation can be larger than waiting status heat dissipation, re-starts the temperature curve adjustment, and PLC controls dutycycle according to temperature curve again, thereby reaches the purpose of controlling temperature.
Claims (2)
1. the temperature control system of a reflow machine, it is characterized in that: comprise K type thermopair, and K type the thermopair temperature-measuring module, temperature curve setting part, PID regulator, controller, driver, PLC actuator, solid-state relay and the well heater that are electrically connected to successively.
2. minute state temperature control system of a kind of Reflow Soldering welding machine according to claim 1, it is characterized in that: described control system mainly is divided into soaking condition, temperature constant state, three states of duty.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110363701 CN103116374A (en) | 2011-11-16 | 2011-11-16 | Temperature control system of reflow soldering machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110363701 CN103116374A (en) | 2011-11-16 | 2011-11-16 | Temperature control system of reflow soldering machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103116374A true CN103116374A (en) | 2013-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110363701 Pending CN103116374A (en) | 2011-11-16 | 2011-11-16 | Temperature control system of reflow soldering machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN103116374A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521907A (en) * | 2013-10-09 | 2014-01-22 | 鞍钢股份有限公司 | Device and method for controlling regional temperature of welding machine |
| CN105436647A (en) * | 2015-12-31 | 2016-03-30 | 深圳市振华威电子有限公司 | Automatic reflow welding machine and automatic reflow welding method |
| CN105807812A (en) * | 2014-12-30 | 2016-07-27 | 中核控制***工程有限公司 | PID temperature control method and temperature control module |
-
2011
- 2011-11-16 CN CN 201110363701 patent/CN103116374A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521907A (en) * | 2013-10-09 | 2014-01-22 | 鞍钢股份有限公司 | Device and method for controlling regional temperature of welding machine |
| CN105807812A (en) * | 2014-12-30 | 2016-07-27 | 中核控制***工程有限公司 | PID temperature control method and temperature control module |
| CN105436647A (en) * | 2015-12-31 | 2016-03-30 | 深圳市振华威电子有限公司 | Automatic reflow welding machine and automatic reflow welding method |
| CN105436647B (en) * | 2015-12-31 | 2018-07-13 | 深圳市振华微电子有限公司 | Automatic Re-current welder |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130522 |