CN113608509B - Online extensible Internet of things platform based on circuit board production line - Google Patents
Online extensible Internet of things platform based on circuit board production line Download PDFInfo
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- CN113608509B CN113608509B CN202110865661.0A CN202110865661A CN113608509B CN 113608509 B CN113608509 B CN 113608509B CN 202110865661 A CN202110865661 A CN 202110865661A CN 113608509 B CN113608509 B CN 113608509B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
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- 238000005192 partition Methods 0.000 claims description 39
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- 238000007789 sealing Methods 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
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- 239000008186 active pharmaceutical agent Substances 0.000 claims description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by quality surveillance of production
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32368—Quality control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
On-line extensible internet of things platform based on circuit board production line, wherein: the invention provides an online extensible Internet of things platform based on a circuit board production line, aiming at solving the problems of online connection mode of production line equipment, PLC control and the like.
Description
Technical Field
The invention belongs to a production line Internet of things platform, and particularly relates to an online extensible Internet of things platform based on a circuit board production line.
Background
The internet of things is that any object is connected with a network through information sensing equipment according to an agreed protocol, and the object performs information exchange and communication through an information transmission medium so as to realize functions of intelligent identification, positioning, tracking, supervision and the like.
With the rapid development of the internet of things technology, more and more different types of internet of things devices are connected to the internet of things platform, and due to the fact that data transmission protocols used by the different types of internet of things devices are different, the data formats transmitted by the internet of things devices are also different.
In the related art, in order to support access of internet of things devices using different data transmission protocols, two ways are generally available, one is normalization of an internet of things device end, which means that the internet of things device end processes reported data into data in a uniform format required by an internet of things platform; the other method is the normalization of the platform of the internet of things, which means that the original data is uploaded by the equipment terminal, namely the platform of the internet of things receives data in different formats, but the platform of the internet of things has the capability of processing data in different formats.
At present, the internet of things platform aiming at the production line needs to connect the whole production line in series in different modes, and various different connection modes and equipment on-line schemes are needed.
Disclosure of Invention
The invention provides an online extensible Internet of things platform based on a circuit board production line, aiming at solving the problems of online connection mode of production line equipment, PLC control and the like.
The above object of the present invention is achieved by the following technical solutions:
on-line extensible internet of things platform based on circuit board production line, wherein: the EAP platform is an enterprise management software platform, the connection mode comprises hard connection and soft connection, the circuit board production line comprises a horizontal line, a copper immersed wire, a VCP, an AOI/VRS, an electric test and drilling machine and a milling machine, and the set Internet of things platform shares data of the whole production line through the hard connection and the soft connection.
Preferably, the hard connection mode is directly connected with a PLC (programmable logic controller), an I/O (input/output) control card, various sensors and other hardware such as an intelligent gateway and an expansion module of the control device through an EAP (extensible authentication protocol) platform, wherein the hard connection protocol comprises Modbus, RS485 and RS 232.
Preferably, the soft connection is a system docking and data acquisition mode through an industrial control system, an equipment database, an operation log and other software modes of equipment, wherein the soft connection protocol comprises TCP/Http/OPC/API.
Preferably, the hard connection mode is realized through PLC-based equipment connection, and comprises a PLC expansion Ethernet communication module and a PLC self-contained Ethernet communication module, the PLC expansion Ethernet communication module uses an expansion module mode to expand an Internet access or adopts a serial port to convert the Internet access to a module conversion Internet access for connection, and then reads data through a corresponding communication protocol, and the PLC self-contained Ethernet communication module is directly connected through a network cable and then reads data through a corresponding communication protocol.
Preferably, the data acquisition in the online file-based equipment in the soft connection mainly comprises the step of uploading data required in the file to an MES (manufacturing execution system) through acquiring and analyzing a log file output by the equipment; the database-based equipment connection means that an EAP platform acquires data by accessing a local or remote database of the equipment, and the equipment connection of the database needs an equipment supplier to provide a data dictionary; the online mode based on the industrial control system is mainly direct butt joint between the system and the system, and the communication mode adopts TCP, Http (Restful API/Web Service) and OPC.
Preferably, including sinking the copper line in the circuit board production line, sinking the copper line is including removing gluey burring equipment, remove gluey burring equipment including the base, remove the room of gluing, the base is circular structure, the base periphery evenly is provided with removes the room of gluing, base internally mounted has the PLC controller, the PLC controller with the EAP platform is connected.
Preferably, the degumming chamber is of a fan-shaped structure with a hollow interior, a partition plate is arranged in the degumming chamber and is positioned in the middle section of the degumming chamber, a sealing plate is arranged below the partition plate, an electromagnetic device is arranged at a position corresponding to the position of the partition plate and the sealing plate and controls the opening and closing between the partition plate and the sealing plate, a base is arranged below the degumming chamber, a spring is arranged on the base, the other end of the spring is connected with the sealing plate, a circuit board is placed above the partition plate, a liquid outlet is arranged below the degumming chamber and is communicated with a liquid outlet pipeline, the other end of the liquid outlet pipeline is connected with the upper part of the adjacent degumming chamber in the clockwise direction, an auxiliary limiting device is arranged below the partition plate, a liquid sensor is arranged above the partition plate, an air pressure sensor is arranged below the partition plate, and the liquid sensor and the air pressure sensor are connected with the PLC, and a glue removing liquid is stored in the space below the partition plate.
Preferably, supplementary stop device includes the dwang, the dwang is fixed in the place and removes on the gluey room pore wall, it installs the fixing base to remove gluey room pore wall, be connected with spring two on the fixing base, the two other ends of spring are connected with supplementary casing, supplementary casing is similar circular structure, the supplementary casing outside with the baffle contacts, supplementary casing can revolute the pole and be rotary motion.
Preferably, the degumming liquid is mixed with 5 to 10 percent of carborundum.
In summary, the invention includes at least one of the following beneficial technical effects:
the invention adopts a hard connection and soft connection mode to arrange an extensible Internet of things platform, has the advantage of good real-time performance through the hard connection mode, and is easy to develop and deploy through the soft connection; the system has good safety; no additional hardware investment is required.
The invention adopts the direct interaction mode of the industrial control system and the EAP, which can ensure the timeliness and the accuracy of the data, ensure the safety of the systems of the two parties and avoid the abnormal dispute of the equipment.
The invention manages all equipment on the network through the establishment of the Internet of things platform, can control warehouse inventory and even the whole production line, improves working efficiency, integrates data and analysis of all equipment, and enables the production line of the circuit board to greatly improve production smoothness and data abnormity early warning.
Fourthly, the glue removing and deburring equipment provided by the invention accelerates the reaction efficiency of the glue removing liquid in a required reaction area through pressure and siphon phenomena, and simultaneously removes burrs through carborundum in the glue removing liquid aiming at the problem of burrs left after drilling in the previous working procedure,
due to the characteristics of the fluid, the flow speed is accelerated at the position with a small aperture, and the water flow thrust of the carborundum at the aperture is increased, so that the carborundum can smoothly trim burrs, and the increased water flow can smoothly flush out residues reacted in the hole.
Sixth, the invention through to a plurality of remove the joint setting of the room of glue, can drive the operation of the subsequent room of removing glue through the first room of removing glue, has saved the energy consumption, has reduced the manufacturing cost of the factory production line.
Drawings
FIG. 1 is a general schematic diagram of an online extensible Internet of things platform based on a circuit board production line;
FIG. 2 is a schematic diagram of a PLC-based device online solution block of the online extensible Internet of things platform based on the circuit board production line;
FIG. 3 is a file-based device online scheme of the online extensible Internet of things platform based on a circuit board production line of the present invention;
fig. 4 is a database-based device online solution of the online extensible internet of things platform based on the circuit board production line of the present invention;
FIG. 5 is an industrial control system-based device online scheme of the online extensible Internet of things platform based on the circuit board production line;
FIG. 6 is a schematic diagram of the glue and burr removing device of the online extensible Internet of things platform based on the circuit board production line;
FIG. 7 is a schematic cross-sectional view of the glue and burr removing device of the online extensible Internet of things platform based on the circuit board production line;
FIG. 8 is an enlarged partial view of "E" of FIG. 7 of the circuit board production line based online scalable IOT platform of the present invention;
FIG. 9 is a schematic diagram of holes required to be processed in the circuit board of the online extensible Internet of things platform based on the circuit board production line;
in the figure: the device comprises a base 1, a degumming chamber 2, a partition plate 201, a sealing plate 202, an electromagnetic device 203, a base 204, a spring 205, a circuit board 206, a liquid outlet 207, a liquid outlet pipeline 208, a liquid sensor 209, an air pressure sensor 210, a degumming liquid 211, carborundum 212, a rotating rod 301, a fixed seat 302, a spring 303 II and an auxiliary shell 304.
Detailed Description
On-line extensible internet of things platform based on circuit board production line, wherein: the EAP platform is an enterprise management software platform, the connection mode comprises hard connection and soft connection, the circuit board production line comprises a horizontal line, a copper immersed wire, a VCP, an AOI/VRS, an electric test and drilling machine and a milling machine, and the set Internet of things platform shares data of the whole production line through the hard connection and the soft connection.
Specifically, the hard connection mode is directly connected with a PLC (programmable logic controller), an I/O (input/output) control card, various sensors and other hardware such as an intelligent gateway and an extension module of the control equipment through an EAP (extensible authentication protocol) platform, wherein the hard connection protocol comprises Modbus, RS485 and RS 232.
Specifically, the soft connection is a system docking and data acquisition mode through an industrial control system, an equipment database, an operation log and other software modes of the equipment, wherein the soft connection protocol comprises TCP/Http/OPC/API.
Specifically, through the online ethernet communication module of taking certainly of PLC's equipment including PLC extension ethernet communication module and PLC in the hard connected mode, PLC extension ethernet communication module uses the mode extension play net gape of extension module or adopts the module of serial ports commentaries on classics net gape to change out the net gape and connect, then goes to read through corresponding communication protocol, PLC goes to connect with the net twine directly from taking ethernet communication module, then goes to read data through corresponding communication protocol.
Specifically, the data acquisition in the online equipment based on the file in the soft connection mainly comprises the steps of uploading data required in the file to an MES (manufacturing execution system) through acquiring and analyzing a log file output by the equipment; the database-based equipment connection means that an EAP platform acquires data by accessing a local or remote database of the equipment, and the equipment connection of the database needs an equipment supplier to provide a data dictionary; the online mode based on the industrial control system is mainly direct butt joint between the system and the system, and the communication mode adopts TCP, Http (Restful API/Web Service) and OPC (optical proximity correction).
Specifically, including the heavy copper line in the circuit board production line, the heavy copper line is including removing gluey burring equipment, remove gluey burring equipment including base 1, remove gluey room 2, base 1 is circular structure, 1 periphery of base evenly is provided with removes gluey room 2, 1 internally mounted of base has the PLC controller, the PLC controller with the EAP platform is connected.
Specifically, the glue removing chamber 2 is a fan-shaped structure with a hollow interior, a partition plate 201 is installed inside the glue removing chamber 2, the partition plate 201 is located in the middle section of the glue removing chamber, a sealing plate 202 is arranged below the partition plate 201, an electromagnetic device 203 is arranged at a position where the partition plate 201 corresponds to the sealing plate 202, the electromagnetic device 203 controls the opening and closing of the partition plate 201 and the sealing plate 202, a base 204 is installed below the glue removing chamber 2, a spring 205 is arranged on the base 204, the other end of the spring 205 is connected with the sealing plate 202, a circuit board 206 is arranged above the partition plate 201, a liquid outlet 207 is arranged below the glue removing chamber 2, the liquid outlet 207 is communicated with a liquid outlet pipe 208, the other end of the liquid outlet pipe 208 is connected with the upper part of the glue removing chamber 2 adjacent in the clockwise direction, an auxiliary limiting device is arranged below the partition plate 201, and a liquid sensor 209 is arranged above the partition plate 201, an air pressure sensor 210 is arranged below the partition board 201, the liquid sensor 209 and the air pressure sensor 210 are connected with the PLC, and a glue removing liquid 211 is stored in the space below the partition board 201.
Specifically, supplementary stop device includes dwang 301, dwang 301 is fixed in the department and removes on the room 2 pore wall of gluing, remove and glue 2 pore walls of room and install fixing base 302, be connected with two 303 of springs on the fixing base 302, two 303 other ends of springs are connected with supplementary casing 304, supplementary casing 304 is quasi-circular structure, the supplementary casing 304 outside with baffle 201 contacts, supplementary casing 304 can revolute and move pole 301 and be rotary motion.
Specifically, the degumming liquid 211 is mixed with 5% -10% of carborundum 212.
Principle of operation
File-based device online scheme:
first, get the device log file
And obtaining the log file in the equipment industrial control computer, and placing the log file in a server shared directory.
Second, log file parsing
And contacting the equipment supplier to obtain the analysis mode of the log file.
Third, analysis test of log file
And on the server, compiling an equipment file analyzer through an equipment log analysis file, uploading the log file to a server shared directory through an equipment industrial control system by the equipment log file, analyzing the file in the shared directory by the equipment file analyzer, and uploading the file to a corresponding platform.
Formal analysis of log file
The device file analyzer analyzes the device log file under the server shared directory and uploads data to a corresponding platform.
Directly publishing data such as equipment state, alarm information, equipment parameters and the like to a field monitoring board through an EAP platform; and the tracing and statistical data are issued to an MES system database through an MES middleware interface for tracing and statistical analysis of the data.
The PLC-based equipment online scheme comprises the following steps:
the equipment PLC controller stores the acquired data to the PLC controller point location through an industrial control system or a sensor, wherein the data mainly comprises information such as equipment running state, alarm information, key process parameters, output statistics and the like;
the EAP platform is actively connected with the PLC, corresponding data is extracted according to needs to be analyzed and sorted, and the sorted data is issued to the corresponding platform;
directly issuing data such as equipment state, alarm information, equipment parameters and the like to a field monitoring board through an EAP platform; and the tracing and statistical data are issued to an MES system database through an MES middleware interface for tracing and statistical analysis of the data.
Database-based device online scheme
The equipment industrial control system stores the acquired data to a local or remote database through a PLC or a sensor, wherein the data mainly comprises information such as equipment running state, alarm information, key process parameters, output statistics and the like;
the EAP is actively connected with the equipment database, corresponding data is extracted according to enterprise needs to be analyzed and sorted, and the sorted data is published to a corresponding platform;
directly issuing data such as equipment state, alarm information, equipment parameters and the like to a field monitoring board through an EAP platform; and the tracing and statistical data are issued to an MES system database through an MES middleware interface for tracing and statistical analysis of the data.
Equipment on-line scheme based on industrial control system
The data acquisition has two modes by interfacing with an industrial control system: push and pull;
the push mode refers to that an EAP system provides a data uploading interface, and an industrial control system calls the interface to upload data; the pull type refers to that an interface is provided by an industrial control system of the equipment, and an EAP system calls the interface regularly to acquire data;
and thirdly, after the EAP system acquires the data, uploading the data to a system database through the middleware.
When the copper sinking wire works, the circuit board 206 to be processed is placed on the partition plate 201 of the glue removing and deburring device at one time, the glue removing liquid 211 is filled at the lower end of each glue removing chamber 2, at the moment, the electromagnetic device 203 works to enable the partition plate 201 and the sealing plate 202 to be tightly attached, the lower end of each glue removing chamber 2 is in a sealed environment, at the moment, the glue removing liquid 211 is poured into the upper end of one glue removing chamber 2, at the moment, the glue removing liquid 211 slowly presses the circuit board 206 and the partition plate 201 downwards due to the self weight, at the moment, because the auxiliary shell 304 is of a similar circular structure, when the partition plate 201 is positioned above the auxiliary shell 304, the auxiliary shell 304 has a force of pushing the partition plate 201 upwards under the action of the spring two 303, then along with the increase of the weight of the glue removing liquid 211, when the partition plate 201 moves to exceed the maximum peripheral point of the auxiliary shell 304, the partition plate 210 is positioned below the auxiliary shell 304, at the moment, the auxiliary shell 304 has a force of pushing the partition plate 201 downwards under the action of the spring two 303, at the moment, the partition plate 210 moves the partition plate 210 and the circuit board 206 downwards at an acceleration under the action of the degumming liquid 211 and the auxiliary limiting device 3, at the moment, the air at the lower end of the degumming chamber 2 is compressed, the degumming liquid 211 at the lower end is extruded into the liquid outlet pipeline 208, because the auxiliary limiting device can provide an acceleration and downward movement thrust for the partition plate 201, the liquid outlet pipeline 208 is filled with the degumming liquid 211 at the moment, the liquid flows into the upper end of the next degumming chamber 2 from the outlet of the liquid outlet pipeline 208, at the moment, the degumming liquid 211 at the lower end of the degumming chamber 2 forms a siphon environment with the upper end of the next degumming chamber through the liquid outlet pipeline 208, simultaneously, the electromagnetic device 203 is closed, the partition plate 201 is separated from the sealing plate 202, at the moment, because the air pressure below the degumming chamber 2 is low, the liquid in the degumming chamber 2 is filled into the lower part of the degumming chamber 206 through the holes in the circuit board 206, and because the hole diameter of the circuit board 206 is small, the flow rate can be accelerated in the holes, meanwhile, as part of the carborundum 212 is arranged in the degumming liquid 211, burrs of holes can be removed well, meanwhile, as the flow rate of other positions is relatively low, the influence of the carborundum 212 in the liquid on other positions is low, and simultaneously, as the flow rate of the degumming position required to react in the degumming process is accelerated, the carborundum 212 can react at the required position and flush out waste materials at the same time, along with the fact that liquid at the upper end flows into the lower end, the weight of the upper part is reduced, the partition plate 201 gradually moves upwards under the action of the spring 205 and finally returns to the initial position, and the degumming liquid flowing out from the liquid outlet pipeline under the siphon action is filled into the upper end of the next degumming chamber, so that the next degumming chamber can work smoothly.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. On-line extensible Internet of things platform based on circuit board production line, its characterized in that: the EAP platform is connected with equipment of a production line through a network and exchanges information, the EAP platform is an enterprise management software platform, the connection mode comprises hard connection and soft connection, a circuit board production line comprises a horizontal line, a copper sinking wire, a VCP, an AOI/VRS, an electric test, a drilling machine and a milling machine, the set Internet of things platform shares data of the whole production line through the hard connection and the soft connection, the circuit board production line comprises the copper sinking wire, the copper sinking wire comprises glue and burr removing equipment, the glue and burr removing equipment comprises a base (1) and a glue removing chamber (2), the base (1) is of a circular structure, the periphery of the base (1) is uniformly provided with the glue removing chamber (2), a PLC controller is installed inside the base (1) and connected with the EAP platform, and the glue removing chamber (2) is of a hollow fan-shaped structure inside, the glue removing chamber (2) is internally provided with a partition plate (201), the partition plate (201) is positioned at the middle section of the glue removing chamber, a sealing plate (202) is arranged below the partition plate (201), an electromagnetic device (203) is arranged at the position corresponding to the sealing plate (202) of the partition plate (201), the electromagnetic device (203) controls the opening and closing of the partition plate (201) and the sealing plate (202), a base (204) is arranged below the glue removing chamber (2), a spring (205) is arranged on the base (204), the other end of the spring (205) is connected with the sealing plate (202), a circuit board (206) is placed above the partition plate (201), a liquid outlet (207) is arranged below the glue removing chamber (2), the liquid outlet (207) is communicated with a liquid outlet pipeline (208), and the other end of the liquid outlet pipeline (208) is connected with the upper part of the clockwise adjacent glue removing chamber (2), baffle (201) below is provided with supplementary stop device, baffle (201) top is provided with liquid sensor (209), baffle (201) below is provided with baroceptor (210), liquid sensor (209) with baroceptor (210) with the PLC controller is connected, the space in baffle (201) below is stored and is removed glue solution (211).
2. The circuit board production line-based online extensible internet of things platform according to claim 1, wherein: the hard connection mode is that the PLC, the I/O control card, various sensors and other hardware such as an intelligent gateway and an expansion module of the control equipment are directly connected through an EAP platform, wherein the hard connection protocol comprises Modbus, RS485 and RS 232.
3. The circuit board production line-based online extensible internet of things platform according to claim 1, wherein: the soft connection is realized by an industrial control system of the equipment, an equipment database, an operation log and other modes of system docking and data acquisition through software, wherein the soft connection protocol comprises TCP/Http/OPC/API.
4. The circuit board production line-based online extensible internet of things platform according to claim 2, wherein: the device comprises a PLC expansion Ethernet communication module and a PLC self-contained Ethernet communication module which are connected through a PLC-based device in a hard connection mode, wherein the PLC expansion Ethernet communication module uses an expansion module mode to expand an Internet access or adopts a serial port to convert the module of the Internet access to convert the Internet access to connect, then reads through a corresponding communication protocol, and the PLC self-contained Ethernet communication module directly uses a network cable to connect and then reads data through the corresponding communication protocol.
5. The circuit board production line-based online extensible internet of things platform of claim 3, wherein: the data acquisition in the online equipment based on the files in the soft connection mainly comprises the steps of uploading data required in the files to an MES (manufacturing execution system) by acquiring and analyzing log files output by the equipment; the database-based equipment connection means that an EAP platform acquires data by accessing a local or remote database of the equipment, and the equipment connection of the database needs an equipment supplier to provide a data dictionary; the online mode based on the industrial control system is mainly direct butt joint between the system and the system, and the communication mode adopts TCP, Http (Restful API/Web Service) and OPC (optical proximity correction).
6. The circuit board production line-based online extensible internet of things platform according to claim 1, wherein: supplementary stop device includes dwang (301), dwang (301) are fixed in the department and remove on gluey room (2) pore wall, remove gluey room (2) pore wall and install fixing base (302), be connected with spring two (303) on fixing base (302), the spring two (303) other end is connected with auxiliary housing (304), auxiliary housing (304) are similar circular structure, auxiliary housing (304) outside with baffle (201) contacts, auxiliary housing (304) can revolute and move pole (301) and be rotary motion.
7. The circuit board production line-based online extensible internet of things platform of claim 1, wherein: the degumming liquid (211) is mixed with 5 to 10 percent of carborundum (212).
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| CN202110865661.0A CN113608509B (en) | 2021-07-29 | 2021-07-29 | Online extensible Internet of things platform based on circuit board production line |
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| CN113608509B true CN113608509B (en) | 2022-08-12 |
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| JPH0537137A (en) * | 1991-02-28 | 1993-02-12 | Fujitsu Ltd | Manufacture of printed wiring board |
| JP3213074B2 (en) * | 1992-10-01 | 2001-09-25 | イビデン株式会社 | Multilayer printed wiring board |
| JP2001007535A (en) * | 1999-06-17 | 2001-01-12 | Mitsubishi Gas Chem Co Inc | Manufacture of multilayer printed wiring board with through-hole of high reliability |
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