CN106970187A - The oxygen concentration detecting system and control method of wave-soldering/reflow soldering - Google Patents
The oxygen concentration detecting system and control method of wave-soldering/reflow soldering Download PDFInfo
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- CN106970187A CN106970187A CN201710403927.3A CN201710403927A CN106970187A CN 106970187 A CN106970187 A CN 106970187A CN 201710403927 A CN201710403927 A CN 201710403927A CN 106970187 A CN106970187 A CN 106970187A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
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Abstract
The invention discloses a kind of oxygen concentration detecting system of wave-soldering/reflow soldering and control method, including：Process circuit, at least controller, sampling gas circuit and at least flow control gas circuit all the way all the way, the sampling gas circuit and flow control gas circuit are corresponded, and the process circuit is connected with each port of the controller；Every all the way including a lambda sensor, a sample gas air inlet and a sample gas gas outlet in the sampling gas circuit, the sample gas air inlet, the lambda sensor and the sample gas gas outlet are sequentially communicated by pipeline；The controller adjusts nitrogen flow according to the parameter information in the oxygen concentration control parameter and the sample gas calculated of setting.The oxygen concentration detecting system and control method for wave-soldering/reflow soldering that the present invention is provided, it can require to be controlled respectively according to the oxygen concentration control of Reflow Soldering/wave-soldering furnace each section, the nitrogen flow for being passed through each section is reached optimum efficiency, nitrogen use level is saved to greatest extent.
Description
Technical field
The present invention relates to a kind of detecting and controlling system and method, more particularly to a kind of oxygen of wave-soldering/reflow soldering are dense
Spend detecting system and control method.
Background technology
Current SMT（Surface Mount Technology, surface mounting technology）In industry, in order to ensure welding
Reliability, generally using economic and rich nitrogen as protective atmosphere, because Reflow Soldering/wave-soldering furnace has sealing and follows
The problem of ring convection current ability so that the use cost of nitrogen is high, and whole wave-soldering/Reflow Soldering industry competition at present is fierce,
Cost advantage seems all the more important, therefore in order to cost-effective, it is the problem of SMT manufacturers pay much attention to reduce nitrogen consumption.
In the prior art, two kinds of processing modes typically control the oxygen concentration in fluid welding/wave-soldering furnace.
Some SMT manufacturers are passed through the nitrogen flow of Reflow Soldering/wave-soldering furnace to control oxygen in stove using manual regulation
Concentration, but this needs is skilled in technique, veteran personnel could complete, this method can not effectively save nitrogen money
Source, it is impossible to realize the purpose for economizing on gas cost.And completed by the experience of operating personnel, it is impossible to ensure the weldering of each batch
Connect effect all good, product quality is uneven.
Some SMT manufacturers detect the oxygen concentration of Reflow Soldering/wave-soldering furnace using an oxygen analyzer, use a ratio
Valve regulation nitrogen flow controls the oxygen concentration in stove, and this method has very high intelligent, and its control effect is very good, real
The purpose for saving nitrogen cost is showed, has been to use at present while having saved cost of labor, it is ensured that the product quality of each batch
Method the most universal.But there is also certain defect for this method：Reflow Soldering/wave-soldering furnace is made up of multiple sections, is such as added
Hot-zone, weld zone, cooling zone etc., requirement of the regional to oxygen concentration are different, and required nitrogen amount is also different, and this method
The nitrogen total flow for leading to whole piece Reflow Soldering/wave-soldering furnace or the nitrogen flow for leading to some section can only be controlled, so
Still nitrogen can not be saved to greatest extent；And oxygen analyzer and proportioning valve and unrealized fusion, SMT manufacturers in the prior art
Have to consider whether the two can realize interconnection when choosing oxygen analyzer and proportioning valve, also have when installing, safeguarding
Many inconvenience.
A kind of applied in Reflow Soldering/wave-soldering furnace it is therefore desirable to provide, oxygen concentration is detected and controlled is
System, it can detect and control respectively the oxygen concentration of each section of Reflow Soldering/wave-soldering furnace.
The content of the invention
The technical problems to be solved by the invention be to provide a kind of wave-soldering/reflow soldering oxygen concentration detecting system and
Control method, can be respectively controlled according to the oxygen concentration control requirement of Reflow Soldering/wave-soldering furnace each section, make to be passed through each
The nitrogen flow of section reaches optimum efficiency, and nitrogen use level is saved to greatest extent.
The present invention is to provide a kind of oxygen of wave-soldering/reflow soldering to solve the technical scheme that above-mentioned technical problem is used
Gas concentration detection system, including：
Process circuit, at least controller, sampling gas circuit and at least flow control gas circuit, the sampling gas circuit and described all the way all the way
Flow control gas circuit is corresponded, and the process circuit is connected with each port of the controller；
It is every all the way including a lambda sensor, a sample gas air inlet and a sample gas gas outlet, institute in the sampling gas circuit
Sample gas air inlet, the lambda sensor and the sample gas gas outlet is stated to be sequentially communicated by pipeline；
Often going out all the way including a volume control device, a nitrogen inlet and a nitrogen in the flow control gas circuit
Gas port, the nitrogen inlet, the volume control device and the nitrogen gas outlet are sequentially communicated by pipeline；
The process circuit is electrically connected with the lambda sensor in the sampling gas circuit, the volume control device, the processing
Circuit be respectively the lambda sensor, the volume control device provide power supply and gather and handle the lambda sensor, it is described
The analog electrical signal of volume control device feedback, the process circuit will obtain digital telecommunication after analog electrical signal processing
Number, and the digital electric signal is sent to the controller, the controller calculates sample gas by the digital electric signal
In parameter information, the controller according to the oxygen concentration of setting control require and the sample gas calculated in parameter information
Adjust nitrogen flow.
Further, it is every all the way also including flowmeter, pressure sensor, needle valve in the gas circuit of at least sampling all the way
And aspiration pump, the flowmeter, pressure sensor, needle valve and aspiration pump are sequentially communicated by pipeline.
Further, the volume control device is digital proportional valve.
Further, the parameter information in the sample gas includes oxygen density value, sample atmospheric pressure and sample throughput.
Further, the controller includes display device and input unit, the display device and the input unit
For inputting oxygen concentration control pressure and flow parameter to the controller.
Further, it is described at least all the way sampling gas circuit and at least all the way flow control gas circuit be four tunnels sampling gas circuit and four
Road flow control gas circuit.
The present invention also provides the control method of above-mentioned oxygen concentration detecting system for solution above-mentioned technical problem, including following
Step：
Oxygen concentration control parameter is set to controller by display device and input unit；
Per sampling gas circuit collection sample gas all the way, test the oxygen concentration value of the sample gas, sample atmospheric pressure, sample throughput and be sent to place
Manage circuit；
The processing circuit processes lambda sensor, pressure sensor, the signal of flowmeter collection are simultaneously sent to controller；
The controller calculates oxygen concentration value, sample atmospheric pressure, the parameter information of sample throughput, and the controller is according to the oxygen of setting
Parameter information in concentration control parameter and the sample gas calculated adjusts the aperture size of each volume control device, realizes
Nitrogen flow is controlled.
The oxygen concentration detecting system and control method for wave-soldering/reflow soldering that the present invention is provided, can according to Reflow Soldering/
The oxygen concentration control of each section of wave-soldering furnace requires to be controlled respectively, the nitrogen flow for being passed through each section is reached most preferably
Effect, saves nitrogen use level to greatest extent.
Further, the present invention can detect the oxygen concentration value of the multiple sections of Reflow Soldering/wave-soldering furnace simultaneously.
Further, the present invention merges oxygen analyzer and proportioning valve, solves user and voluntarily selects oxygen analyzer and ratio
Compatibility issue during example valve, while reducing difficulties in installation and maintenance.
Further, the present invention is simple in construction, is its large-scale popularization and application, has established solid foundation.
Brief description of the drawings
Fig. 1 is a kind of module map of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention；
Fig. 2 is a kind of sampling gas circuit connection of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of flow control gas circuit of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention
Connection diagram.
Embodiment
The oxygen concentration detecting system and control method of a kind of wave-soldering/reflow soldering in the embodiment of the present invention, can root
It is respectively controlled according to the oxygen concentration control requirement of Reflow Soldering/wave-soldering furnace each section, makes the nitrogen stream for being passed through each section
Amount reaches optimum efficiency, and nitrogen use level is saved to greatest extent.
It is understandable to enable above-mentioned purpose, feature and beneficial effect of the invention to become apparent, below in conjunction with the accompanying drawings to this
The specific embodiment of invention is described in detail.
Fig. 1 is a kind of module map of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention.Such as
Shown in Fig. 1, a kind of oxygen concentration detecting system of wave-soldering/reflow soldering, including：Process circuit 14, controller 12, at least one
Road is sampled gas circuit 11 and at least flow control gas circuit 13 all the way, and the sampling gas circuit 11 and the flow control a pair of gas circuit 13 1
Should, the process circuit 14 is connected with each port of the controller 12；Often including all the way in the sampling gas circuit 11
At least one lambda sensor, a sample gas air inlet and a sample gas gas outlet, the sample gas air inlet, the lambda sensor and
The sample gas gas outlet is sequentially communicated by pipeline；It is every all the way including a flow control dress in the flow control gas circuit 13
Put, a nitrogen inlet and a nitrogen gas outlet, the nitrogen inlet, the volume control device and the nitrogen go out
Gas port is sequentially communicated by pipeline；The process circuit 14 is filled with lambda sensor, flow control in the sampling gas circuit 11
Put electrical connection, the process circuit 14 be respectively the lambda sensor, the volume control device power supply is provided and gather and
The lambda sensor, the analog electrical signal of volume control device feedback are handled, the process circuit 14 is electric by the simulation
Digital electric signal is obtained after signal transacting, the digital electric signal is sent to the controller 12, institute by the process circuit 14
State controller 12 and parameter information in sample gas is calculated by the digital electric signal, the controller 12 is dense according to the oxygen of setting
Degree control is required and the parameter information regulation nitrogen flow in the sample gas calculated.The process circuit 14 is put including signal
Big circuit, filter circuit, A/D change-over circuits, signal follow circuit, I/V change-over circuits etc., and these circuits are in the prior art
Common circuit, will not be repeated here.The controller 12 is common single-chip microcomputer, such as MC9S12XS128.
In specific implementation, the parameter information in the sample gas includes oxygen density value, sample atmospheric pressure, sample throughput.Institute
Stating controller includes display device and input unit, and the display device is used for and the input unit is used for the controller
Input oxygen concentration control pressure, flow parameter.
Wherein, it is described at least all the way sampling gas circuit and at least all the way flow control gas circuit be preferably four tunnels sample gas circuit and four
Road flow control gas circuit.
Fig. 2 is a kind of sampling gas circuit of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention
Connection diagram.As shown in Fig. 2 every all the way also including flowmeter, pressure sensing in the gas circuit 11 of at least sampling all the way
Device, needle valve, aspiration pump, the flowmeter, pressure sensor, needle valve, aspiration pump are sequentially communicated by pipeline.
Fig. 3 is a kind of flow control of the oxygen concentration detecting system of wave-soldering/reflow soldering in the embodiment of the present invention
Gas circuit connection diagram.As shown in figure 3, in specific implementation, the volume control device is digital proportional valve.The present invention passes through
Display device and input unit are required to controller setting oxygen concentration control；The oxygen for testing the sample gas per sampling gas circuit all the way is dense
Angle value, sample atmospheric pressure, sample throughput are simultaneously sent to process circuit；The processing circuit processes lambda sensor, pressure sensor, stream
The signal of gauge collection is simultaneously sent to controller；The controller calculates the parameter letter of oxygen concentration value, sample atmospheric pressure, sample throughput
Breath, the controller controls to require to adjust nitrogen stream with the parameter information in the sample gas calculated according to the oxygen concentration of setting
Amount.Wherein, the oxygen concentration control parameter includes control oxygen concentration control pressure and flow parameter.
The oxygen concentration detecting system and control method for wave-soldering/reflow soldering that the present invention is provided, can according to Reflow Soldering/
The oxygen concentration control of each section of wave-soldering furnace requires to be controlled respectively, the nitrogen flow for being passed through each section is reached most preferably
Effect, saves nitrogen use level to greatest extent.
Further, the present invention can detect the oxygen concentration value of the multiple sections of Reflow Soldering/wave-soldering furnace simultaneously.
Further, the present invention is simple in construction, is its large-scale popularization and application, has established solid foundation.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification can be made and perfect, therefore the protection model of the present invention
Enclose when by being defined that claims are defined.
Claims (7)
1. a kind of oxygen concentration detecting system of wave-soldering/reflow soldering, it is characterised in that including：
Process circuit, at least controller, sampling gas circuit and at least flow control gas circuit, the sampling gas circuit and described all the way all the way
Flow control gas circuit is corresponded, and the process circuit is connected with each port of the controller；
It is every all the way including a lambda sensor, a sample gas air inlet and a sample gas gas outlet, institute in the sampling gas circuit
Sample gas air inlet, the lambda sensor and the sample gas gas outlet is stated to be sequentially communicated by pipeline；
Often going out all the way including a volume control device, a nitrogen inlet and a nitrogen in the flow control gas circuit
Gas port, the nitrogen inlet, the volume control device and the nitrogen gas outlet are sequentially communicated by pipeline；
The process circuit is electrically connected with the lambda sensor in the sampling gas circuit, the volume control device, the processing
Circuit be respectively the lambda sensor, the volume control device provide power supply and gather and handle the lambda sensor, it is described
The analog electrical signal of volume control device feedback, the process circuit will obtain digital telecommunication after analog electrical signal processing
Number, and the digital electric signal is sent to the controller, the controller calculates sample gas by the digital electric signal
In parameter information, the controller according to the oxygen concentration of setting control require and the sample gas calculated in parameter information
Adjust nitrogen flow.
2. the oxygen concentration detecting system of wave-soldering/reflow soldering according to claim 1, it is characterised in that it is described extremely
It is every all the way also including flowmeter, pressure sensor, needle valve and aspiration pump, the flowmeter, pressure in few gas circuit of sampling all the way
Force snesor, needle valve and aspiration pump are sequentially communicated by pipeline.
3. the oxygen concentration detecting system of wave-soldering/reflow soldering according to claim 1, it is characterised in that the stream
Amount control device is digital proportional valve.
4. the oxygen concentration detecting system of wave-soldering/reflow soldering according to claim 1, it is characterised in that the sample
Parameter information in gas includes oxygen density value, sample atmospheric pressure and sample throughput.
5. the oxygen concentration detecting system of wave-soldering/reflow soldering according to claim 1, it is characterised in that the control
Device processed includes display device and input unit, and the display device and input unit are used to input oxygen concentration control to the controller
Pressing pressure and flow parameter.
6. the oxygen concentration detecting system of wave-soldering/reflow soldering according to claim 1, it is characterised in that it is described extremely
Few sampling gas circuit all the way and at least flow control gas circuit to be that four tunnels sampling gas circuit and four road flows control gas circuits all the way.
7. a kind of oxygen concentration detects control method, it is characterised in that dense using the oxygen as described in claim any one of 1-6
Detecting system is spent, the control method comprises the following steps：
Oxygen concentration control parameter is set to controller by display device and input unit；
Per sampling gas circuit collection sample gas all the way, test the oxygen concentration value of the sample gas, sample atmospheric pressure, sample throughput and be sent to place
Manage circuit；
The processing circuit processes lambda sensor, pressure sensor, the signal of flowmeter collection are simultaneously sent to controller；
The controller calculates oxygen concentration value, sample atmospheric pressure, the parameter information of sample throughput, and the controller is according to the oxygen of setting
Parameter information in concentration control parameter and the sample gas calculated adjusts the aperture size of each volume control device, realizes
Nitrogen flow is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710403927.3A CN106970187A (en) | 2017-06-01 | 2017-06-01 | The oxygen concentration detecting system and control method of wave-soldering/reflow soldering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710403927.3A CN106970187A (en) | 2017-06-01 | 2017-06-01 | The oxygen concentration detecting system and control method of wave-soldering/reflow soldering |
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| CN106970187A true CN106970187A (en) | 2017-07-21 |
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| CN201710403927.3A Pending CN106970187A (en) | 2017-06-01 | 2017-06-01 | The oxygen concentration detecting system and control method of wave-soldering/reflow soldering |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806463A (en) * | 2019-10-29 | 2020-02-18 | 首钢京唐钢铁联合有限责任公司 | Method and system for detecting atmosphere in annealing furnace |
| CN110874106A (en) * | 2018-08-31 | 2020-03-10 | 伊利诺斯工具制品有限公司 | Gas control system and method for reflow oven |
| CN111805046A (en) * | 2020-07-09 | 2020-10-23 | 武汉倍普科技有限公司 | Oxygen control system of reflow oven |
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