CN107717169A - The high speed acquisition device and method of testing of a kind of resistance brazing welding temperature - Google Patents
The high speed acquisition device and method of testing of a kind of resistance brazing welding temperature Download PDFInfo
- Publication number
- CN107717169A CN107717169A CN201711138364.6A CN201711138364A CN107717169A CN 107717169 A CN107717169 A CN 107717169A CN 201711138364 A CN201711138364 A CN 201711138364A CN 107717169 A CN107717169 A CN 107717169A
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- Prior art keywords
- temperature
- welding
- thermocouple
- resistance brazing
- host computer
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- 238000003466 welding Methods 0.000 title claims abstract description 71
- 238000005219 brazing Methods 0.000 title claims abstract description 36
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 8
- 229910000679 solder Inorganic materials 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 7
- 238000009991 scouring Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000009472 formulation Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000035900 sweating Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0004—Resistance soldering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Abstract
The invention discloses a kind of high speed acquisition device of resistance brazing welding temperature and method of testing, wherein device includes multiple thermocouples of the welding temperature data of detection resistance soldered fitting；Receive the temperature information that the thermocouple detects and convert analog signals into the processing unit that data signal exports data message with serial port form；Receive the host computer that the data message of the processing unit transmission shows the welding temperature of resistance brazing joint with curve form.The apparatus and method can adapt to the characteristics of resistance brazing heat time is short, temperature change is fast very well, multichannel is coordinated to gather simultaneously, can be easily to realizing the Real Time Observation and complete documentation of weld zone diverse location temperature changing process, the formulation for reasonable welding procedure provides reliable basis.The high-speed temperature harvester and measuring method of the present invention is equally applicable to that Cooling rate is very fast and the temperature acquisition of measuring temperature in charged mode occasion, has a extensive future.
Description
Technical field
The present invention relates to high-power motor stator manufacturing field, more particularly to a kind of high speed of resistance brazing welding temperature to adopt
Acquisition means and method of testing.
Background technology
Usually there is three-phase winding connection lines fracture event in the process of running in High power Traction motor applied to rail vehicle
Barrier, faulty motor, which returns, finds that electromagnetism wire breaking position is located at lead and conducting ring welding point on motor stator after factory disintegrates
Root.Joint at this realized by Resistance brazing technology and connected, the tissue of the Thermal Cycle process of soldering to lead mother metal
Impacted with performance, most important problem is exactly to cause mother metal crystal grain to be grown up and mechanical properties decrease.Wherein to mother metal group
It is the maximum temperature that welding process is undergone to knit the factor maximum with performance impact.In the feelings that packing material and method for welding are selected
Under condition, rational welding procedure is studied and defined, welding temperature is reduced as far as possible and shortens high-temperature residence time and followed with reducing sweating heat
Ring is very necessary to the adverse effect of mother metal.If welding temperature that can be under Accurate Determining difference welding condition,
Direct basis will be provided to formulate rational welding procedure, the safe operation for rail vehicle is significant.
Due to the own characteristic of resistance brazing, the past is difficult to accurate measurement field of welding temperature always and Thermal Cycle is bent
Line, main cause have at 3 points：
First, solder and piece-holder pass through resistance heat heated weld zone, weld zone between two electrodes during resistance brazing
Temperature can not use infrared mode direct measurement, one side resistance heat be by internal heat production, it is infrared to be only capable of detecting surface temperature, it is pure
The heat conduction and radiating of copper are exceedingly fast, and surface temperature and internal temperature difference are larger；Another aspect infrared detection is easily by surrounding environment
Influence, during welding around electromagnetic radiation and the factors affect testing result such as air flow accuracy.
Second, similar with first point, being also with the bimetallic temperature measurer of contact can only be beyond measuring electrode retained part
Region, can not direct measurement weld zone temperature.
3rd, thermocouple is embedded in weld zone in advance, should be good mode by thermocouple measurement welding temperature, but
The heating process of resistance brazing is very short, and (or even can be with shorter) can complete to weld within several seconds, current commercial temperature measurer
Table almost all is to sample once each second, and sampling rate is too slow, it is difficult to captures accurate temperature changing process.It is in addition, electric
In the welding process for hindering soldering, workpiece is powered, although voltage is not high, welding current is very big (thousands of~tens thousand of amperes), and one
Aspect has an impact to the potential difference signal of thermocouple, on the other hand, must if welding current flows into temperature control instrument and forms loop
So burn.Generally use armoured thermocouple can solve the problems, such as live testing, but armouring is even due to having armouring and insulating barrier, responds
Time is elongated, is equally difficult to accurately catch temperature change.At present, the commercial temperature instrumentation for having part uses voltage isolation technology not
As for burning table, but sampling rate is inadequate.Therefore develop it is a kind of can live testing while acquisition rate high temperature acquisition dress again
Put, the welding temperature using the device with regard to energy Accurate Determining resistance brazing.
The content of the invention
The problem of being existed according to prior art, the invention discloses a kind of high speed acquisition device of resistance brazing welding temperature
And method of testing, the high speed acquisition device of one of which resistance brazing welding temperature include：
Multiple thermocouples of the welding temperature data of detection resistance soldered fitting；
Receive the temperature information that the thermocouple detects and convert analog signals into data signal by data message to go here and there
The processing unit of degree of lip-rounding formula output；
The data message for receiving the processing unit transmission shows the welding temperature of resistance brazing joint with curve form
Host computer；
The processing unit includes electric pressure converter, a/d converter, core CPU and USB/TTL converters, and the voltage turns
Parallel operation receives the temperature data information of thermocouple transmission by the information transmission received to a/d converter, the a/d converter
It is connected with core CPU, the core CPU is connected with USB/TTL converters, the USB/TTL converters and host computer phase
Connection.
The processing unit also includes insulating power supply, and the insulating power supply is connected with the core CPU.
A kind of method of testing of the high speed acquisition device of resistance brazing welding temperature, comprises the following steps：
S1, in conducting ring or electromagnetism lead treat that welding zone opens the deep grooves of 1.5mm, diameter 1mm K-type thermocouple is put into
In groove, thermocouple weldering is embedded in groove by resistance brazing mode with HL204 solders, then surface polishes flat, and uses scouring pad
Wiped clean；
S2, the conducting ring of pre-buried thermocouple and lead assembled by production requirement, thermocouple is connected with electric pressure converter
On, the runs software in host computer is opened, in holding state；
S3, start resistance brazing, while the software start temperature collection in host computer by production technology；
After S4, step S3 welding terminate, welding thermal cycle curve is checked by the runs software in host computer, and preserve examination
Test data.
A kind of by adopting the above-described technical solution, high speed acquisition device of resistance brazing welding temperature provided by the invention
And method of testing, have the following advantages that：
1st, the hyper tape in temperature field can be realized by using the sampling rate of voltage isolation technology and raising acquisition chip
Electrical measurement, it is possible to achieve multichannel gathers the welding thermal cycle curve of weld zone diverse location simultaneously, and the temperature of diverse location becomes
Change process can Real Time Observation and complete documentation.
2nd, using K-type thermocouple as temperature sensor direct measurement weld zone temperature, its sensitivity, the response time and point
Degree scope can adapt to the characteristics of resistance brazing heat time is short, and temperature change is fast, higher relative to indirect measurement, accuracy.
3rd, the welding temperature measured by the use of the method for the present invention can be as the correction foundation of the indirect thermometric of infrared radiation thermometer.With
This method and infrared Indirect Temperature Measurement synchronous acquisition, then find out the mathematical relationship of the two, subsequently by the data after collection
Can realizes convenient thermometric and temperature control by infrared radiation thermometer.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structure principle chart of the high-speed temperature harvester of the present invention；
Fig. 2 is the welding structure figure of the electromagnetism lead of embodiments of the invention 1 and neutral ring；
Fig. 3 is welding thermal cycle curve of the electromagnetism lead with neutral ring of embodiments of the invention 1；
Fig. 4 is the electromagnetism lead of embodiments of the invention 2 and the welding structure of return rings；
Fig. 5 is the electromagnetism lead of embodiments of the invention 2 and the welding thermal cycle curve of return rings.
Embodiment
To make technical scheme and advantage clearer, with reference to the accompanying drawing in the embodiment of the present invention, to this
Technical scheme in inventive embodiments is clearly completely described：
A kind of high speed acquisition device of resistance brazing welding temperature as shown in Figure 1, including：Detection resistance soldered fitting
Multiple thermocouples 1 of welding temperature data；The temperature information detected is converted analog signals into data signal by thermocouple 1 will
The processing unit 11 that data message is exported with serial port form.Host computer 13 receives the data message that the processing unit 11 transmits will
The welding temperature of resistance brazing joint is shown with curve form.Wherein host computer 13 by software real-time display temperature curve, and
Record and storage temperature curve and data.The method direct measurement motor stator of thermocouple 1 is buried by welding in advance using the device
The welding temperature of resistance brazing joint, efficiently, accurately.The device and measuring method are equally applicable to that Cooling rate is very fast and band
The temperature acquisition that electrical measurement thermal field is closed, has a extensive future.
Further, processing unit 11 includes electric pressure converter 2, a/d converter 3, core CPU 4 and USB/TTL converters
5, electric pressure converter 2 receives temperature data information that the thermocouple 1 transmits by the information transmission received to a/d converter 3,
A/d converter 3 is connected with core CPU 4, and core CPU 4 is connected with USB/TTL converters 5, USB/TTL converters 5 with it is upper
Machine 13 is connected.Processing unit 11 obtains at a high speed temperature signal from thermocouple 1, and is converted into data signal and is transmitted to host computer again
13.The external 220V industrial-frequency alternating currents of processing unit 11, voltage isolation strength 1500V；Time/second of 4 sampling rate of core CPU 1000；
The data that core CPU 4 is transmitted through are changed into serial port data format by USB/TTL converters 5, then send host computer 13；AD conversion
Device 3 and electric pressure converter 2 are converted into the analog signal of thermocouple 1 data signal and send core CPU 4 to handle.
The processing unit 11 also includes insulating power supply 6, and insulating power supply 6 is connected with the core CPU 4.
A kind of method of testing of the high speed acquisition device of resistance brazing welding temperature, comprises the following steps：
S1, in conducting ring or electromagnetism lead treat that welding zone opens the deep grooves of 1.5mm, diameter 1mm K-type thermocouple is put into
In groove, thermocouple (1) weldering is embedded in groove by resistance brazing mode with HL204 solders, then surface polishes flat, clean with hundred
Cloth wiped clean；
S2, the conducting ring of pre-buried thermocouple and lead assembled by production requirement, by thermocouple (1) and electric pressure converter
(2) in connection, the runs software in host computer (13) is opened, in holding state；
S3, start resistance brazing, while the software start temperature collection in host computer (13) by production technology；
After S4, step S3 welding terminate, welding thermal cycle curve is checked by the runs software in host computer (13), and protect
Deposit test data.
The present invention is embedded in by the way of position to be measured and lays thermocouple using thermocouple is welded with HL204 solders in advance, both may be used
To ensure that thermocouple 1 fully contacts with workpiece, the measurement error caused by loose contact is avoided, while it also avoid welding
Thermocouple misplaces and come off in journey.
Thermocouple 1 is even from K-type, and its sensitivity, response time and indexing scope all meet test request, and price is just
Preferably.Thermo wires diameter selects 1mm, and meticulous thermo wires is easily broken and failed in use, and excessively thick thermo wires then can be to weld zone
Heat transfer and system resistance heat production have an impact, and then welding temperature is produced deviation.
HL204 solders are the solders used in motor stator production, have from brazing flux and act on, are especially suitable for resistance brazing,
Its resistivity and thermal conductivity factor all approach with the lead mother metal welded, thus with the weldering of this solder bury thermocouple to system heat production and
The influence of radiating is minimum.Groove is all filled up with HL204 when welding thermocouple, and postwelding surface polishes flat and wiped clean, this
Sample also eliminates the influence of contact resistance during to resistance brazing.
Embodiment 1
As shown in Fig. 2 the welding structure of electromagnetism lead riser and neutral ring is on certain type traction electric machine stator：2 copper electromagnetism
Lead (specification：2.42mm × 7.15mm) it is distributed up and down along broadside, centre 1 piece of 0.4mm thickness HL204 weld tabs of folder, then again with
Property ring (specification：3mm × 10mm) it is distributed up and down along broadside, centre 1 piece of 0.4mm thickness HL204 weld tabs (weld tabs specification of folder:0.4×9
×11)。
To determine the Temperature Distribution feature along electromagnetism lead longitudinal direction, in advance respectively in lead and lead brazed seam center, lead
The K-type thermocouple of 1mm diameters is buried with neutral ring brazed seam center and the weldering of 5mm heat affected areas position, Standard is good as shown in Figure 2
Afterwards, temperature high speed acquisition device and host computer are connected, opens upper computer software, then starts to weld while measure welding temperature.
By manufacturing technique requirent, during welding, two interelectrode clamping force 0.6MPa, welding use power current, and PULSE HEATING (welds 12
In week, stop 6 weeks), welding current 46%.After welding ends, temperature variation curve and data, tool are preserved and recorded on host computer
Body is as shown in Figure 3.
Embodiment 2
As shown in figure 4, certain traction electric machine lead riser and return rings welding structure：1 electromagnetism lead (specification：2.42mm×
7.15mm) with return rings lenticular wire (specification：4mm × 12.5mm) it is distributed up and down along broadside, centre 1 piece of 0.4mm thickness HL204 weld tabs of folder
(weld tabs specification:0.4×9×11).
To determine along the horizontal Temperature Distribution feature of electromagnetism lead, at lead upper surface, brazed seam center and return respectively in advance
Road ring lower surface, which is welded, buries the K-type thermocouples of 1mm diameters, after Standard is good as shown in Figure 4, connection temperature high speed acquisition device and
Host computer, upper computer software is opened, then start to weld while measure welding temperature.By manufacturing technique requirent, during welding, two electricity
The clamping force 0.6MPa of interpolar, welding use power current, PULSE HEATING (welding 12 weeks, stop 6 weeks), welding current 42%.
After welding ends, temperature variation curve and data are preserved and recorded on host computer, specifically as shown in Figure 5.
The apparatus and method can adapt to the characteristics of resistance brazing heat time is short, temperature change is fast very well, coordinate multichannel
Gather simultaneously, can be easily to realizing the Real Time Observation and complete documentation of weld zone diverse location temperature changing process
The formulation of reasonable welding procedure provides reliable basis.The high-speed temperature harvester and measuring method of the present invention is equally applicable to become
Warm speed is very fast and the temperature acquisition of measuring temperature in charged mode occasion, has a extensive future.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (4)
- A kind of 1. high speed acquisition device of resistance brazing welding temperature, it is characterised in that including：The weldering of detection resistance soldered fitting Multiple thermocouples (1) of jointing temp data；Receive the temperature information that the thermocouple (1) detects and convert analog signals into data signal by data message with serial ports The processing unit (11) of form output；The data message for receiving the processing unit (11) transmission shows the welding temperature of resistance brazing joint with curve form Host computer (13)；The processing unit (11) includes electric pressure converter (2), a/d converter (3), core CPU (4) and USB/TTL converters (5), the electric pressure converter (2) receives the temperature data information of thermocouple (1) transmission by the information transmission received extremely A/d converter (3), the a/d converter (3) are connected with core CPU (4), the core CPU (4) and USB/TTL converters (5) it is connected, the USB/TTL converters (5) are connected with host computer (13).
- 2. a kind of high speed acquisition device of resistance brazing welding temperature according to claim 1, is further characterized in that：It is described Processing unit (11) also includes insulating power supply (6), and the insulating power supply (6) is connected with the core CPU (4).
- 3. a kind of high speed acquisition device of resistance brazing welding temperature according to claim 1, is further characterized in that：It is described Thermocouple (1) is a diameter of 1mm K-type thermocouple.
- 4. a kind of a kind of method of testing of the high speed acquisition device of resistance brazing welding temperature as claimed in claim 1, it is special Sign is：Comprise the following steps：S1, in conducting ring or electromagnetism lead treat that welding zone opens the deep grooves of 1.5mm, diameter 1mm K-type thermocouple is put into groove In, thermocouple (1) weldering is embedded in groove by resistance brazing mode with HL204 solders, then surface polishes flat, and uses scouring pad Wiped clean；S2, the conducting ring of pre-buried thermocouple and lead assembled by production requirement, by thermocouple (1) and electric pressure converter (2) even Connect, the runs software in host computer (13) is opened, in holding state；S3, start resistance brazing, while the software start temperature collection in host computer (13) by production technology；After S4, step S3 welding terminate, welding thermal cycle curve is checked by the runs software in host computer (13), and preserve examination Test data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711138364.6A CN107717169A (en) | 2017-11-16 | 2017-11-16 | The high speed acquisition device and method of testing of a kind of resistance brazing welding temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711138364.6A CN107717169A (en) | 2017-11-16 | 2017-11-16 | The high speed acquisition device and method of testing of a kind of resistance brazing welding temperature |
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| Publication Number | Publication Date |
|---|---|
| CN107717169A true CN107717169A (en) | 2018-02-23 |
Family
ID=61216780
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711138364.6A Pending CN107717169A (en) | 2017-11-16 | 2017-11-16 | The high speed acquisition device and method of testing of a kind of resistance brazing welding temperature |
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| CN (1) | CN107717169A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317772A (en) * | 2018-11-20 | 2019-02-12 | 武汉理工大学 | A kind of Experimental Characterization and numerical simulation combine the method for probing into laser brazing process parameter |
| CN112719511A (en) * | 2019-07-04 | 2021-04-30 | 吴文泉 | Circuit board assembling machine and using method |
| CN112997231A (en) * | 2018-11-16 | 2021-06-18 | 松下知识产权经营株式会社 | Brazing work assistance method, program, and brazing work assistance system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112997231A (en) * | 2018-11-16 | 2021-06-18 | 松下知识产权经营株式会社 | Brazing work assistance method, program, and brazing work assistance system |
| CN109317772A (en) * | 2018-11-20 | 2019-02-12 | 武汉理工大学 | A kind of Experimental Characterization and numerical simulation combine the method for probing into laser brazing process parameter |
| CN112719511A (en) * | 2019-07-04 | 2021-04-30 | 吴文泉 | Circuit board assembling machine and using method |
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Application publication date: 20180223 |
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