CN108168239A - A kind of intelligent glass drying unit and furnace drying method based on Zigbee and LTE - Google Patents
A kind of intelligent glass drying unit and furnace drying method based on Zigbee and LTE Download PDFInfo
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- CN108168239A CN108168239A CN201810142113.3A CN201810142113A CN108168239A CN 108168239 A CN108168239 A CN 108168239A CN 201810142113 A CN201810142113 A CN 201810142113A CN 108168239 A CN108168239 A CN 108168239A
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- lte
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
Abstract
A kind of intelligent glass drying unit and furnace drying method based on Zigbee and LTE disclosed by the invention, belong to experimental instrument and equipment technical field.Including LTE base station, high in the clouds and remote control terminal and intelligent glass baker terminal, power supply unit.The intelligent glass baker terminal is made of the central control unit comprising ZigBee wireless communication modules, LTE wireless communication modules and main control MCU and the Temperature Humidity Sensor, execution unit and the power supply unit that are connected with central control unit.By means of Temperature Humidity Sensor, ZigBee and LTE wireless communication modules and LTE network, user can the easily anywhere drying regime of real time inspection glass apparatus, and the data for monitoring humiture are wirelessly transferred, it realizes the remote control terminal monitoring to glass baker and remote control whenever and wherever possible, there are real-time accurate measurements, scientific management, energy saving, reliable.
Description
Technical field
The invention belongs to experimental instrument and equipment technical fields, are related to a kind of intelligent glass baker, and in particular to Yi Zhongji
In the intelligent glass drying unit and furnace drying method of Zigbee and LTE.
Background technology
ZigBee is rising in recent years, a kind of low-power consumption LAN protocol based on IEEE802.15.4 standards.Have
Power consumption and cost it is very low, it is easy realize, data transmission is reliable, short distance operation is feasible, each level safety is very high, autgmentability
The features such as good, particularly suitable electric power is inconvenient, equipment volume is small, transmitted data amount is smaller, is inconvenient to replace battery or charging etc.
Occasion wireless networking uses.
At present, LTE (Long Term Evolution) is that the long-term of UMTS technical standards organized to set up by 3GPP is drilled
Into being divided into two kinds of standards of TD-LTE and FDD-LTE, have that the availability of frequency spectrum is high, peak rate is high, mobility is high and the network architecture
The advantages that flattening and simplification, periodic traffic has been widely used in it.LTE technologies include MIMO technology, OFDM technology,
OFDMA technologies and carrier aggregation technology can greatly improve power system capacity and the availability of frequency spectrum, ensure that data transmission is reliable, greatly
Width reduces inter-user interference, accelerates transmission rate etc., if the technology is applied to Internet of Things, can greatly improve transmission information
Amount increases information security and reduces operating cost.
In the lab, for the glass airflow dryer of dry glass vessel, due to cannot find in time vessel by
Drying, baker high loaded process always cause energy waste, instrument rapid wear and generate loud noise, in addition, longer
Drying time can also cause the micro-strain of vessel, and then increase test error, even instrument caused to fail.At the same time, mesh
The necessary field control operation of this preceding quasi-instrument, waste of manpower.
Invention content
In order to overcome the problems of the above-mentioned prior art, the purpose of the present invention is to provide be based on Zigbee based on one kind
With the intelligent glass drying unit and furnace drying method of LTE, the intelligent glass drying unit is reasonable in design, easy to use, energy
Enough solving existing glass baker cannot close and cause energy waste, be unable to the problems such as remote control in time.
The present invention is to be achieved through the following technical solutions：
The invention discloses a kind of intelligent glass drying unit based on Zigbee and LTE, including LTE base station, high in the clouds, remote
Journey mobile terminal, power supply unit and the intelligent glass baker terminal being arranged in glass baker housing, remote mobile terminal
By LTE base station and high in the clouds, communicate interconnection with intelligent glass baker terminal；
The intelligent glass baker terminal includes central control unit and the temperature being connect respectively with central control unit
Humidity sensor and execution unit；Wherein：Central control unit, for the humiture of environment carry out calculation process, and according to
Calculation process output control execution unit；Temperature Humidity Sensor, for detecting the humiture of glassware, and by the warm and humid of detection
Degree signal is conveyed to central control unit；Execution unit, for controlling the opening and closing of heating element and electric fan；Power supply is single
Member can provide power supply for central control unit, execution unit and Temperature Humidity Sensor；
The central control unit, the ZigBee wireless communication modules interacted respectively including main control MCU and with main control MCU
With LTE wireless communication modules；Wherein：Main control MCU analyzes and processes for the ambient temperature and humidity information to input；ZigBee
Wireless communication module, for transmitting the data of Temperature Humidity Sensor acquisition；LTE wireless communication modules, are emitted by antenna element
Wireless signal connects remote mobile terminal, and the command signal for communicating with remote mobile terminal and generating remote mobile terminal is converted
Main control MCU is transmitted to after into digital signal.
Preferably, execution unit includes the temperature detect switch (TDS) and fan swicth that are connected respectively with main control MCU, and temperature detect switch (TDS) is used
In the opening and closing of control heating element；Fan swicth, for controlling the opening and closing of electric fan.
Preferably, fan swicth and temperature detect switch (TDS) are respectively connected by a relay with main control MCU, are realized respectively to glass
The control of the electric fan and heating element of baker；Remote mobile terminal can send out command signal to relay, be put to control
The electric fan and heating element being placed in air duct, realize the remote control to glass baker.
Preferably, the main control MCU uses STM32F207VCT6 or STM32F103RCT6；The ZigBee wireless communications
Module uses CC2530, CC2430 or PL-2303HX；The LTE wireless communication modules use SIM7600CE or SIM7100C.
Preferably, power supply unit includes transformation regulator circuit and power supply, and transformation regulator circuit is connected with power supply, is master control
MCU provides the direct current that voltage is 5V, and the direct current that voltage is 3.3V is provided for ZigBee wireless communication modules, is that LTE is wireless
Communication module provides the direct current of 4V.
Preferably, Temperature Humidity Sensor includes microcontroller and the temperature induction unit, the humidity that are interacted respectively with microcontroller
Sensing unit and sensor ZigBee wireless communication modules, sensor can pass through radio frequency day with ZigBee wireless communication modules
Collected data of the Temperature and Humidity module signal is transmitted to ZigBee wireless communication modules by line.
Preferably, glass baker is equipped with intelligent control board, and central control unit is equipped on the intelligent control board；
Temperature Humidity Sensor is set in the drying pipe of glass baker, and drying pipe is welded in the upper end housing of glass baker, is dried
The upper end of main pipe offers hot wind export mouth, and lower end offers hot wind inlet port.
Preferably, the upper end housing of glass baker is divided into housing outer layer and housing internal layer, is vertically set on housing internal layer
Spiral aviation baffle and several drying pipes are equipped with, between several drying pipes lay the adjacent wooden partition of spiral aviation baffle, and at this
Several tongue type protrusive boards for enhancing disturbance are also laid in the inside of spiral aviation baffle, and glassware to be dried is plugged in drying pipe
On.
Preferably, remote mobile terminal uses PAD, smart mobile phone or PC, supports Android platform or ios platform.
The invention also discloses the sides dried using the above-mentioned intelligent glass drying unit based on Zigbee and LTE
Method includes the following steps：
1) after the data of the Temperature and Humidity module of Temperature Humidity Sensor acquisition glassware, data of the Temperature and Humidity module is transmitted to main control MCU；
2) after main control MCU carries out calculation process to data of the Temperature and Humidity module, pass through LTE wireless communication modules, antenna element and LTE
Base station is interconnected with high in the clouds, is finally shown in remote mobile terminal；
3) remote mobile terminal sends out command signal to main control MCU and carrys out control execution unit, and execution unit control is positioned over
The opening and closing of electric fan and heating element in air duct, realize the remote control to glass baker.
Compared with prior art, the present invention has technique effect beneficial below：
Intelligent glass drying unit disclosed by the invention based on Zigbee and LTE, including LTE base station, high in the clouds and long-range
Control terminal and intelligent glass baker terminal, power supply unit.The intelligent glass baker terminal is by wireless comprising ZigBee
Communication module, the central control unit of LTE wireless communication modules and main control MCU and the temperature that is connected with central control unit
Humidity sensor, execution unit and power supply unit composition.By means of Temperature Humidity Sensor, ZigBee and LTE wireless communication modules
And LTE network, user can the easily anywhere drying regimes of real time inspection glass apparatus, and will monitor humiture
Data be wirelessly transferred, realize the remote control terminal monitoring to glass baker and remote control whenever and wherever possible, have
Real-time accurate measurements, scientific management, it is energy saving, reliable the advantages of.
Further, Temperature Humidity Sensor is set in the drying pipe of glass baker, and drying pipe is welded in glass drying
In the upper end housing of device, the upper end for drying pipe offers hot wind export mouth, and lower end offers hot wind inlet port.Glass baker
Upper end housing is divided into housing outer layer and housing internal layer, and spiral aviation baffle and several drying are vertically installed on housing internal layer
Pipe between several drying pipes lay the adjacent wooden partition of spiral aviation baffles, and is also laid in the inside of the spiral aviation baffle several
For enhancing the tongue type protrusive board of disturbance, glassware to be dried is plugged on drying pipe.In use, air from air intake vent into
Enter, become hot wind after pressurized and heating and enter drying gas chamber, then enter from the hot wind for drying pipe lower end along spiral aviation baffle
Mouth enters drying pipe, is discharged from the hot wind export mouth of drying pipe upper end, achievees the purpose that dry glass vessel.
Description of the drawings
Fig. 1 is the Control system architecture block diagram of the present invention；
In Fig. 1：01 is temperature induction unit；02 is humidity inductive unit；03 is microcontroller；04 is sensor ZigBee
Wireless communication module；05 is central control unit；06 is ZigBee wireless communication modules；07 is main control MCU；08 is wireless for LTE
Communication module；09 is LTE base station；010 is high in the clouds；011 is PAD；012 is smart mobile phone；013 is PC；014 is whole for remote mobile
End；015 is power supply unit；016 is execution unit；
Fig. 2 is the structural front view of the present invention；
Fig. 3 is the structure top view of the present invention；
Fig. 4 is the parts and wiring diagram of the present invention.
In Fig. 2~Fig. 4,1 is housing outer layer；2 be housing internal layer；3 be drying pipe；4 be drying gas chamber；5 be heating element；
6 be electric fan；7 be air intake vent；8 be stent；9 be fan swicth；10 be power switch；11 be temperature detect switch (TDS)；21 lead for hot wind
Outlet；22 be spiral aviation baffle；23 be hot wind inlet port；24 ligulate protrusive boards；31 be Temperature Humidity Sensor；32 be intelligent control
Plate；33 be relay；34 be power supply；35 be transformation regulator circuit.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1, a kind of intelligent glass drying unit based on Zigbee and LTE disclosed by the invention, including LTE base station
09th, high in the clouds 010, remote mobile terminal 014, power supply unit 015 and the intelligent glass drying being arranged in glass baker housing
Device terminal, remote mobile terminal 014 is by LTE base station 09 and high in the clouds 010, and communicate interconnection with intelligent glass baker terminal；
The intelligent glass baker terminal includes central control unit 05 and is connect respectively with central control unit 05
Temperature Humidity Sensor 31 and execution unit 016；Wherein：Central control unit 05, for carrying out operation to the humiture of environment
Processing, and according to calculation process output control execution unit 016；Temperature Humidity Sensor 31, for detecting the warm and humid of glassware
Degree, and the temperature-humidity signal of detection is conveyed to central control unit 05；Execution unit 016, for controlling heating element 5 and electricity
The opening and closing of fan 6；Power supply unit 015 can be central control unit 05, execution unit 016 and Temperature Humidity Sensor
31 provide power supply；
The central control unit 05, the ZigBee channel radios interacted respectively including main control MCU 07 and with main control MCU 07
Believe module 06 and LTE wireless communication modules 08；Wherein：Main control MCU 07 is analyzed for the ambient temperature and humidity information to input
Processing；ZigBee wireless communication modules 06, for transmitting the data of the acquisition of Temperature Humidity Sensor 31；LTE wireless communication modules 08,
Wireless signal is emitted by antenna element and connects remote mobile terminal 014, is communicated with remote mobile terminal 014 and by remote mobile
The command signal that terminal 014 generates is transmitted to main control MCU 07 after being converted into digital signal.
As a kind of preferred embodiment of the present embodiment, the temperature control that execution unit 016 includes with main control MCU 07 being connected respectively is opened
Close 11 and fan swicth 9, temperature detect switch (TDS) 11, for controlling the opening and closing of heating element 5；Fan swicth 9, for controlling electricity
The opening and closing of fan 6.Fan swicth 9 and temperature detect switch (TDS) 11 are respectively connected by a relay 33 with main control MCU 07, respectively
Realize the control to the electric fan 6 and heating element 5 of glass baker；Remote mobile terminal 014 can be sent out to relay 33
Command signal to control the electric fan 6 being positioned in air duct and heating element 5, realizes the remote control to glass baker.
As a kind of preferred embodiment of the present embodiment, Temperature Humidity Sensor 31 include microcontroller 03 and respectively with monolithic
Temperature induction unit 01, humidity inductive unit 02 and the sensor ZigBee wireless communication modules 04 that machine 03 interacts, sensor
With ZigBee wireless communication modules 04 can by radio-frequency antenna by collected data of the Temperature and Humidity module signal be transmitted to ZigBee without
Line communication module 06.Sensor is 3.3V with the voltage of ZigBee wireless communication modules 04, passes through storage battery power supply.
Referring to Fig. 2 and Fig. 4, the structure of the intelligent glass drying unit for being based on Zigbee and LTE for the present invention is shown
It is intended to, in glass baker as depicted, the upper end of housing is divided into housing outer layer 1 and housing internal layer 2；3 be drying pipe, waits to dry
Dry glassware is plugged on drying pipe 3, and drying pipe 3 is weldingly connected respectively with housing outer layer 1 and housing internal layer 2.Dry pipe 3
Upper end offer hot wind export mouth 21, lower end offers hot wind inlet port 23.4 be drying gas chamber；5 be heating element, by temperature
11 control of control switch, 6 be electric fan, is controlled by fan swicth 9；The air intake vent of glass baker is stent for 7,8, be can be used for
Fixed central control unit 05,10 is power switch.Referring to Fig. 4, the Temperature Humidity Sensor 31 is placed in drying pipe 3, and is connect
Enter intelligent control board 32.
As a kind of preferred embodiment of the present embodiment, referring to Fig. 3, the vertical view of the glass baker experimental provision for the present invention
Figure, upper end housing are divided into housing outer layer 1 and housing internal layer 2, and there are one spiral aviation baffles for vertical welding setting on housing internal layer 2
22, also vertical welding on housing internal layer 2, and is laid between the adjacent wooden partition of spiral aviation baffle 22 several drying pipes 3, and
Several tongue type protrusive boards 24 for enhancing disturbance are also laid on the inside of the wooden partition of the spiral aviation baffle 22.Spiral aviation baffle 22 is set
Putting can guide hot wind to rotate, and increase wind speed, and wind pressure increases, and so as to strengthen heat and mass, accelerate drying.Tongue type
The setting of protrusive board 24 can play the role of enhancing disturbance.
In use, air enters from air intake vent 7, become hot wind entrance after electric fan 6 and heating element 5 are pressurizeed and heated
It dries in gas chamber 4, then the hot wind inlet port 23 along spiral aviation baffle 22 from 3 lower end of drying pipe enters drying pipe 3, is managed from drying
The hot wind export mouth 21 of 3 upper ends is discharged, and achievees the purpose that dry glass vessel.
As a kind of preferred embodiment of the present embodiment, the main control MCU 07 using STM32F207VCT6 or
STM32F103RCT6；The ZigBee wireless communication modules 06 use CC2530, CC2430 or PL-2303HX；The LTE without
Line communication module 08 uses SIM7600CE or SIM7100C.
Power supply unit 015 includes transformation regulator circuit 35 and power supply 34, and transformation regulator circuit 35 is connected with power supply 34, based on
It controls MCU07 and the direct current that voltage is 5V is provided, be that ZigBee wireless communication modules 06 provide the direct current that voltage is 3.3V, be
LTE wireless communication modules 08 provide the direct current of 4V.
As a kind of preferred embodiment of the present embodiment, remote mobile terminal 014 using PAD011, smart mobile phone 012 or
PC013 supports Android platform or ios platform, and the remote control to glass baker is realized by client.
The intelligent glass drying unit based on Zigbee and LTE of the present invention, when in use：
After 31 gathered data of Temperature Humidity Sensor by sensor with ZigBee wireless communication modules 04 by data by penetrating
Frequency antenna emits, and the ZigBee wireless communication modules 06 of central control unit 05 receive and pass to master control with serial ports after data
MCU 07 after 07 calculation process of main control MCU, passes through LTE wireless communication modules 08, antenna element and LTE base station 09 and high in the clouds
010 phase interconnects, and is finally shown in remote mobile terminal 014, later, pair relay 33 being connected with main control MCU 07 sends out order
Signal, to control the electric fan 6 being positioned in air duct and heating element 5, so as to fulfill the remote control to glass baker.
Claims (10)
1. a kind of intelligent glass drying unit based on Zigbee and LTE, which is characterized in that including LTE base station (09), high in the clouds
(010), remote mobile terminal (014), power supply unit (015) and the intelligent glass baker being arranged in glass baker housing
Terminal, remote mobile terminal (014) are communicated mutually by LTE base station (09) and high in the clouds (010) with intelligent glass baker terminal
Connection；
The intelligent glass baker terminal includes central control unit (05) and is connect respectively with central control unit (05)
Temperature Humidity Sensor (31) and execution unit (016)；Wherein：Central control unit (05), for the humiture to environment into
Row calculation process, and according to calculation process output control execution unit (016)；Temperature Humidity Sensor (31), for detecting glass
The humiture of vessel, and the temperature-humidity signal of detection is conveyed to central control unit (05)；Execution unit (016), for controlling
Heating element (5) processed and the opening and closing of electric fan (6)；Power supply unit (015) can be central control unit (05), hold
Row unit (016) and Temperature Humidity Sensor (31) provide power supply；
The central control unit (05) is wireless including main control MCU (07) and the ZigBee interacted respectively with main control MCU (07)
Communication module (06) and LTE wireless communication modules (08)；Wherein：Main control MCU (07), for the ambient temperature and humidity information to input
It is analyzed and processed；ZigBee wireless communication modules (06), for transmitting the data of Temperature Humidity Sensor (31) acquisition；LTE without
Line communication module (08) emits wireless signal by antenna element and connects remote mobile terminal (014), with remote mobile terminal
(014) command signal for communicating and generating remote mobile terminal (014) is converted into being transmitted to main control MCU (07) after digital signal.
2. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that perform list
First (016) includes the temperature detect switch (TDS) (11) being connected respectively with main control MCU (07) and fan swicth (9), and temperature detect switch (TDS) (11) is used for
Control the opening and closing of heating element (5)；Fan swicth (9), for controlling the opening and closing of electric fan (6).
3. the intelligent glass drying unit according to claim 2 based on Zigbee and LTE, which is characterized in that fan is opened
It closes (9) and temperature detect switch (TDS) (11) is respectively connected by a relay (33) with main control MCU (07), realized respectively to glass baker
Electric fan (6) and heating element (5) control；Remote mobile terminal (014) can send out command signal to relay (33),
It controls the electric fan being positioned in air duct (6) and heating element (5), realizes the remote control to glass baker.
4. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that the master
MCU (07) is controlled using STM32F207VCT6 or STM32F103RCT6；The ZigBee wireless communication modules (06) use
CC2530, CC2430 or PL-2303HX；The LTE wireless communication modules (08) are using SIM7600CE or SIM7100C.
5. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that power supply is single
First (015) includes transformation regulator circuit (35) and power supply (34), and transformation regulator circuit (35) is connected with power supply (34), is master control
MCU (07) provides the direct current that voltage is 5V, is the direct current that ZigBee wireless communication modules (06) provide that voltage is 3.3V, is
LTE wireless communication modules (08) provide the direct current of 4V.
6. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that humiture
Temperature induction unit (01) that sensor (31) is interacted including microcontroller (03) and respectively with microcontroller (03), humidity inductive
Unit (02) and sensor can be led to ZigBee wireless communication modules (04), sensor with ZigBee wireless communication modules (04)
It crosses radio-frequency antenna and collected data of the Temperature and Humidity module signal is transmitted to ZigBee wireless communication modules (06).
7. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that glass baking
Dry device is equipped with intelligent control board (32), and central control unit (05) is equipped on the intelligent control board (32)；Humiture passes
Sensor (31) is set in the drying pipe (3) of glass baker, and drying pipe (3) is welded in the upper end housing of glass baker,
The upper end of drying pipe (3) offers hot wind export mouth (21), and lower end offers hot wind inlet port (23).
8. the intelligent glass drying unit according to claim 7 based on Zigbee and LTE, which is characterized in that glass baking
The upper end housing of dry device is divided into housing outer layer (1) and housing internal layer (2), and helical wind-guiding is vertically installed on housing internal layer (2)
Plate (22) and several drying pipes (3), between several drying pipes (3) lay the adjacent wooden partition of spiral aviation baffle (22), and
Several tongue type protrusive boards (24) for enhancing disturbance are also laid in the inside of the spiral aviation baffle (22), and glassware to be dried is inserted
It is located on drying pipe (3).
9. the intelligent glass drying unit according to claim 1 based on Zigbee and LTE, which is characterized in that long-range to move
Dynamic terminal (014) supports Android platform or ios platform using PAD (011), smart mobile phone (012) or PC (013).
10. it is carried out using the intelligent glass drying unit based on Zigbee and LTE described in any one in claim 1~9
The method of drying, which is characterized in that include the following steps：
1) after the data of the Temperature and Humidity module of Temperature Humidity Sensor (31) acquisition glassware, data of the Temperature and Humidity module is transmitted to main control MCU
(07)；
2) after main control MCU (07) carries out calculation process to data of the Temperature and Humidity module, pass through LTE wireless communication modules (08), antenna element
It interconnects with LTE base station (09) and high in the clouds (010), is finally shown in remote mobile terminal (014)；
3) remote mobile terminal (014) sends out command signal to main control MCU (07) and comes control execution unit (016), execution unit
(016) control is positioned over the opening and closing of the electric fan (6) and heating element (5) in air duct, realizes to glass baker
Remote control.
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| CN108405286A (en) * | 2018-07-10 | 2018-08-17 | 常州普纳电子科技有限公司 | A kind of lacquer painting automatic drying system |
| CN108405286B (en) * | 2018-07-10 | 2018-10-09 | 常州普纳电子科技有限公司 | A kind of lacquer painting automatic drying system |
| CN110300152A (en) * | 2019-05-23 | 2019-10-01 | 南京理工大学 | Internet of Things laboratory equipment monitoring system and method based on TD-LTE |
| CN111556430A (en) * | 2020-04-09 | 2020-08-18 | 国家电网有限公司 | Test management system based on internet of things technology |
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