CN110989516A - DCS-based automatic system control cabinet - Google Patents
DCS-based automatic system control cabinet Download PDFInfo
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- CN110989516A CN110989516A CN201911159777.1A CN201911159777A CN110989516A CN 110989516 A CN110989516 A CN 110989516A CN 201911159777 A CN201911159777 A CN 201911159777A CN 110989516 A CN110989516 A CN 110989516A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 7
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 101100190618 Arabidopsis thaliana PLC3 gene Proteins 0.000 description 15
- 101100520231 Caenorhabditis elegans plc-3 gene Proteins 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 241001422033 Thestylus Species 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 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]
- G05B19/4184—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 fault tolerance, reliability of production system
-
- 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
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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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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- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Fire Alarms (AREA)
Abstract
The invention relates to an automatic system control cabinet based on DCS, belonging to the technical field of control cabinet equipment, and the technical scheme has the key points that the automatic system control cabinet comprises a cabinet body, a DCS control system arranged in the cabinet body and a cabinet door for sealing the cabinet body, wherein the DCS control system is provided with an I/O interface, the I/O interface is connected with a monitoring PLC, a display is fixed on the surface of one side of the cabinet door, which is far away from the cabinet body, and the monitoring PLC is electrically connected with the display; the monitoring PLC is connected with an input keyboard, a keyboard tray which is connected with the cabinet body in a sliding mode is arranged inside the cabinet body, and an operation opening through which the keyboard tray passes is formed in the surface of a cabinet door at the keyboard tray. The invention can conveniently and quickly carry out simulation debugging on the DCS control system.
Description
Technical Field
The invention relates to the technical field of control cabinet equipment, in particular to an automatic system control cabinet based on DCS.
Background
The distributed control system is called DCS for short, and can also be translated into a distributed control system or a distributed computer control system. The method adopts the basic design idea of controlling dispersion, operation and management centralization and adopts a structural form of multilayer grading, cooperation and autonomy. Its main features are its centralized management and decentralized control. The DCS control cabinet is characterized in that a DCS part control system is integrated in the cabinet, so that the DCS control cabinet is called.
The existing DCS control cabinet can refer to a Chinese utility model patent document with an authorization publication number of CN206021034U, and discloses a DCS-I/O instrument control cabinet, which comprises a cabinet body, an Ethernet switch, an industrial communication gateway, a communication isolation module, a PLC and an expansion module thereof, a switching power supply, an air switch, a socket, an isolation conversion module, a relay, a wiring terminal and a touch industrial tablet computer; the Ethernet switch, the industrial communication gateway, the communication isolation module, the PLC and the expansion module thereof, the switching power supply, the air switch, the socket, the isolation conversion module, the relay and the wiring terminal are all arranged inside the cabinet body; the touch industrial tablet computer is arranged on the surface of the panel of the cabinet body.
When the DCS control cabinet is used, the simulation debugging of the DCS control system is often needed, when the existing DCS control cabinet is used for debugging the DCS control system, the data line is needed to be used for connecting the DCS control system with the PC, and then the PC is used for debugging the DCS control system, so that the operation is inconvenient.
Disclosure of Invention
The invention aims to provide an automatic system control cabinet based on DCS, which can conveniently and quickly carry out simulation debugging on a DCS control system.
The above object of the present invention is achieved by the following technical solutions: an automatic system control cabinet based on DCS comprises a cabinet body, a DCS control system arranged in the cabinet body and a cabinet door for sealing the cabinet body, wherein the DCS control system is provided with an I/O interface, the I/O interface is connected with a monitoring PLC, a display is fixed on the surface of one side, away from the cabinet body, of the cabinet door, and the monitoring PLC is electrically connected with the display; the monitoring PLC is connected with an input keyboard, a keyboard tray which is connected with the cabinet body in a sliding mode is arranged inside the cabinet body, and an operation opening through which the keyboard tray passes is formed in the surface of a cabinet door at the keyboard tray.
By adopting the technical scheme, the input peripheral equipment adopts the input keyboard, and is provided with the keyboard tray and the operation port, when information is not input, the keyboard tray is arranged in the cabinet body, when the DCS control system is debugged, the keyboard tray is pulled out of the cabinet body from the operation port, and then the input of adjusting information can be conveniently and quickly carried out through the input keyboard; utilize input keyboard to monitoring PLC input debugging information to monitoring PLC carries out the communication through the IO interface with DCS control system, and then debugs DCS control system, shows debugging information through fixing the display at cabinet door surface, and then makes the staff can convenient and fast debug the monitoring to DCS control system.
The invention is further configured to: the internal portion of cabinet is provided with temperature detection sensor and the signal transmitter who is connected with temperature detection sensor electricity, signal transmitter is connected with monitoring PLC electricity.
Through adopting above-mentioned technical scheme, detect the internal portion of cabinet through temperature detection sensor, send for monitoring PLC after being handled detection signal to thermodetector by signal transmitter, and then can monitor the temperature of the internal portion of cabinet through monitoring PLC.
The invention is further configured to: the monitoring PLC is connected with an audible alarm for outputting audible alarm.
Through adopting above-mentioned technical scheme, monitoring PLC is connected with the audible alarm ware that is used for exporting the sound alarm, and then when taking place unusually to DCS control system's debugging, perhaps when the temperature of the internal portion of cabinet is too high, can send the sound alarm to the external world through audible alarm ware to the suggestion staff in time looks over and overhauls.
The invention is further configured to: the internal portion of cabinet is provided with a plurality of and goes out powder direction towards DCS control system's high-pressure dry powder fire extinguishing jar, be provided with the solenoid electric valve of control play powder on the high-pressure dry powder fire extinguishing jar, the solenoid electric valve is connected with the monitoring PLC electricity.
Through adopting above-mentioned technical scheme, the internal portion of cabinet is provided with high-pressure dry powder fire extinguishing tank to electromagnetic control valve through monitoring PLC control controls high-pressure dry powder fire extinguishing tank, and then when the internal temperature of the monitoring PLC monitoring cabinet body surpassed the fire alarm threshold value, through controlling electromagnetic control valve, makes high-pressure dry powder fire extinguisher spray the dry powder towards DCS control system's circuit, thereby in time with the internal portion of cabinet electrical apparatus on fire go out.
The invention is further configured to: the intelligent monitoring system is characterized by further comprising an electromagnetic switch for controlling the DCS control system to be switched on and off with an external power grid, the electromagnetic switch is connected with an electromagnetic relay for controlling the electromagnetic relay to be switched on and off, and the electromagnetic relay is electrically connected with the monitoring PLC.
Through adopting above-mentioned technical scheme, through the electromagnetic switch who sets up control DCS control system and external electric wire netting break-make, control electromagnetic relay through monitoring PLC, and then when the internal portion of cabinet takes place electrical apparatus and catches fire, break off DCS control system and external electric wire netting through electromagnetic switch, and then reduce the harm that local electrical apparatus conflagration caused.
The invention is further configured to: the electromagnetic switch is connected in series with a mechanical temperature control switch.
Through adopting above-mentioned technical scheme, electromagnetic switch establishes ties has mechanical type temperature detect switch, and mechanical type temperature detect switch does not need the controller to control it, when ambient temperature is higher than its setting, can automatic disconnection to when the internal portion of cabinet takes place the electrical apparatus and catches fire, the reliability of system's outage has further been ensured.
The invention is further configured to: the display adopts a touch display screen.
Through adopting above-mentioned technical scheme, the display adopts the touch-control display screen, and then the staff can carry out information input and processing through the touch-control operation to the display, makes the staff more convenient when debugging and monitoring DCS control system.
The invention is further configured to: the keyboard tray is characterized by further comprising a touch pen used for performing touch operation on the display, and a containing groove for containing the touch pen is formed in the upper surface of the keyboard tray.
Through adopting above-mentioned technical scheme, through the setting of touch-control pen, make things convenient for the staff to carry out touch-control operation to the display, when not using the touch-control pen, place the holding tank with the touch-control pen to the convenience is accomodate the touch-control pen.
In conclusion, the beneficial technical effects of the invention are as follows:
1. debugging information is input to the PLC by using an input keyboard, the PLC is communicated with an I/O interface of the DCS control system according to the debugging information so as to debug the DCS control system, and the debugging information is displayed by a display fixed on the outer surface of a cabinet door, so that a worker can conveniently and quickly debug and monitor the DCS control system;
2. the electromagnetic switch for controlling the connection and disconnection of the DCS control system and an external power grid is arranged, the electromagnetic relay is controlled by the monitoring PLC, and therefore when an electrical appliance fire disaster occurs in the cabinet body, the DCS control system is disconnected from the external power grid through the electromagnetic switch, and damage caused by local electrical appliance fire disasters is reduced; the electromagnetic switch is connected with the mechanical temperature control switch in series, the mechanical temperature control switch does not need to be controlled by a controller, and the mechanical temperature control switch can be automatically disconnected when the environmental temperature is higher than the set environmental temperature, so that the reliability of system power failure is further ensured when an electric appliance catches fire inside the cabinet body;
3. the internal portion of cabinet is provided with high-pressure dry powder fire extinguishing tank to the solenoid electric valve through monitoring PLC control controls high-pressure dry powder fire extinguishing tank, and then when the internal temperature of the monitoring PLC monitoring cabinet body surpassed the fire alarm threshold value, through controlling solenoid electric valve, makes high-pressure dry powder fire extinguisher spray the dry powder towards DCS control system's circuit, thereby in time with the internal portion of cabinet electrical apparatus on fire extinguish.
Drawings
FIG. 1 is a DCS-based automation system control cabinet;
FIG. 2 is a schematic structural view showing the interior of the cabinet;
FIG. 3 is a schematic structural diagram of a keyboard tray;
FIG. 4 is a functional block diagram showing a control flow of a monitoring PLC;
fig. 5 is a schematic diagram of a connection circuit between the DCS control system and an external power grid.
In the figure, 1, a cabinet body; 11. a cabinet door; 12. an operation port; 2. a DCS control system; 21. an I/O interface; 3. monitoring the PLC; 31. an audible alarm; 4. a display; 41. a stylus; 5. an input keyboard; 6. a keyboard tray; 61. accommodating grooves; 7. a temperature detection sensor; 71. a signal transmitter; 8. a high pressure dry powder fire extinguishing tank; 81. an electromagnetic control valve; 9. an electromagnetic switch; 91. an electromagnetic relay; 92. mechanical temperature control switch.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides an automation system control cabinet based on DCS, refers to fig. 1 and fig. 2, hereinafter refers to the DCS control cabinet for short, includes cabinet body 1, sets up the DCS control system 2 in cabinet body 1 inside and carries out confined cabinet door 11 to cabinet body 1. DCS control system 2 is provided with IO interface 21, and IO interface 21 is connected with monitoring PLC3, and one side fixed surface that cabinet door 11 kept away from cabinet body 1 has display 4, and monitoring PLC3 is connected with display 4 electricity. The monitoring PLC3 is also connected to an input peripheral for inputting debugging information, the input peripheral employing an input keyboard 5. The display 4 is a touch display screen, and the DCS control cabinet further includes a stylus 41 for performing touch operation on the display 4. When debugging the DCS control system 2, a worker inputs debugging information through the input keyboard 5 or inputs corresponding debugging information through touch control on the display 4, and then the monitoring PLC3 communicates with the DCS control system 2 through the I/O interface 21, so that the debugging operation is performed on the DCS control system 2.
Referring to fig. 2, a keyboard tray 6 slidably connected to the cabinet body 1 is disposed inside the cabinet body 1, and an operation opening 12 for allowing the keyboard tray 6 to pass through is disposed on a surface of a cabinet door 11 at the keyboard tray 6. The input keyboard 5 is placed on the keyboard tray 6, and when the input keyboard 5 is not used, the keyboard tray 6 is placed inside the cabinet 1. When information is to be input using the input keyboard 5, the keyboard tray 6 is pulled out from the operation opening 12, and information is input using the input keyboard 5.
Referring to fig. 2 and 3, the keyboard tray 6 has a receiving groove 61 formed on an upper surface thereof for receiving the stylus 41. When not using stylus 41, place stylus 41 in the holding tank 61, and then conveniently accomodate stylus 41, make stylus 41 difficult for losing in daily use.
Referring to fig. 1 and 4, a temperature detection sensor 7 and a signal transmitter 71 electrically connected to the temperature detection sensor are disposed inside the cabinet 1, and the signal transmitter 71 is electrically connected to a monitoring PLC 3. The monitoring PLC3 is connected to an audible alarm 31 for outputting an audible alarm. The temperature detection sensor 7 detects the temperature inside the cabinet 1, and the detection signal is transmitted to the transmitter, and after the detection signal is processed by the transmitter, the detection signal is transmitted to the monitoring PLC3, and then the monitoring PLC3 transmits the detection signal to generate temperature information by the signal transmitter 71, and the temperature information is displayed and output by the display 4. The staff shows the temperature information of output through display 4, and then can in time know the inside ambient temperature of the cabinet body 1. When the ambient temperature value in the cabinet body 1 is higher than the alarm threshold value, monitoring PLC3 sends out alarm instruction to audible alarm 31, and then audible alarm ware sends out audible alarm information to the external world to the suggestion staff in time looks over the maintenance to the DCS switch board.
The inside high-pressure dry powder fire extinguishing jar 8 that is provided with a plurality of powder direction orientation DCS control system 2 that goes out of the cabinet body 1, high-pressure dry powder fire extinguishing jar 8 department be provided with cabinet body 1 inner wall adoption bolted connection's fixed clamp, fix high-pressure dry powder fire extinguishing jar 8 on the inner wall of the cabinet body 1 through fixed clamp. An electromagnetic control valve 81 for controlling powder discharge is arranged on the high-pressure dry powder fire extinguishing tank 8, and the electromagnetic control valve 81 is electrically connected with a monitoring PLC 3. When the detection temperature in the cabinet body 1 is higher than the fire alarm threshold value, the monitoring PLC3 controls the electromagnetic control valve 81 to be opened, and then the high-pressure dry powder extinguishing tank 8 sprays dry powder to the electrical circuit of the DCS control system 2, so that when an electrical appliance is on fire in the cabinet body 1, the fire source can be extinguished in time.
Referring to fig. 4 and 5, the DCS control cabinet further includes an electromagnetic switch 9 for controlling the DCS control system 2 to be switched on and off with an external power grid, the electromagnetic switch 9 is connected to an electromagnetic relay 91 for controlling the switching of the electromagnetic switch 9, and the electromagnetic relay 91 is electrically connected to the monitoring PLC 3. The electromagnetic switch 9 is connected in series with a mechanical temperature control switch 92. When the internal temperature of the cabinet body 1 is high, the circuit of the DCS control system 2 is easy to cause fire of an electric appliance, and further fire threats are caused to equipment and the surrounding environment. Monitoring PLC3 monitors the detection temperature of the internal 1 of cabinet, when the detection temperature of the internal 1 of cabinet is higher than the fire alarm threshold value, then judge that the internal portion of cabinet takes place the electrical apparatus and catches fire, control electromagnetic relay 91 through monitoring PLC3 this moment, make electromagnetic relay 91 control electromagnetic switch 9 disconnection, and then the system power supply of disconnection DCS control system 2 to reduce the threat to the surrounding environment safety when the internal portion of cabinet produces the electrical apparatus and catches fire. The mechanical temperature control switch 92 does not need a controller to control the mechanical temperature control switch, and can be automatically disconnected when the ambient temperature is higher than the ambient temperature, so that the reliability of system power failure is further ensured when the electric appliance in the cabinet body 1 is on fire.
The implementation principle of the embodiment is as follows:
when the DCS control system 2 is debugged, the display screen is touch-controlled by the input keyboard 5 or the touch pen 41, and then debugging information is input to the monitoring PLC 3. The monitoring PLC3 communicates with the DCS control system 2 via the I/O interface 21 to perform debugging operations on the DCS control system 2. The temperature detection sensor 7 detects the temperature inside the cabinet 1, and then monitors the ambient temperature information inside the cabinet 1 through the monitoring PLC 3. When the ambient temperature value in the cabinet body 1 is higher than the alarm threshold value, the monitoring PLC3 sends out an alarm instruction to the audible alarm 31, and then the audible alarm sends out audible alarm information to the outside. When the detected temperature in the cabinet body 1 is higher than the fire alarm threshold value, it is determined that an electric appliance is on fire inside the cabinet body 1, and at the moment, the electromagnetic relay 91 is controlled through the monitoring PLC3, so that the electromagnetic relay 91 controls the electromagnetic switch 9 to be switched off, and further the system power supply of the DCS control system 2 is switched off; the monitoring PLC3 controls the electromagnetic control valve 81 to be opened, and then the high-pressure dry powder fire extinguishing tank 8 sprays dry powder to an electric circuit of the DCS control system 2.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides an automatic system control cabinet based on DCS, includes the cabinet body (1), sets up at inside DCS control system (2) of the cabinet body (1) and carries out confined cabinet door (11) to the cabinet body (1), DCS control system (2) are provided with IO interface (21), its characterized in that: the I/O interface (21) is connected with a monitoring PLC (3), a display (4) is fixed on the surface of one side, away from the cabinet body (1), of the cabinet door (11), and the monitoring PLC (3) is electrically connected with the display (4); monitoring PLC (3) are connected with input keyboard (5), cabinet body (1) inside be provided with cabinet body (1) sliding connection's keyboard tray (6), operation mouth (12) that hold keyboard tray (6) and pass through are seted up on cabinet door (11) surface of keyboard tray (6) department.
2. The DCS-based automation system control cabinet of claim 1, further comprising: the cabinet body (1) is inside to be provided with temperature detection sensor (7) and with signal transmitter (71) that temperature detection sensor (7) electricity is connected, signal transmitter (71) are connected with monitoring PLC (3) electricity.
3. The DCS-based automation system control cabinet of claim 2, further comprising: the monitoring PLC (3) is connected with an audible alarm (31) for outputting audible alarm.
4. The DCS-based automation system control cabinet of claim 2, further comprising: the cabinet body (1) is inside to be provided with high-pressure dry powder fire extinguishing tank (8) that a plurality of goes out powder direction towards DCS control system (2), be provided with control out solenoid electric valve (81) of powder on high-pressure dry powder fire extinguishing tank (8), solenoid electric valve (81) are connected with monitoring PLC (3) electricity.
5. The DCS-based automation system control cabinet of claim 2, further comprising: the intelligent monitoring system is characterized by further comprising an electromagnetic switch (9) for controlling the DCS control system (2) and an external power grid to be switched on and off, wherein the electromagnetic switch (9) is connected with an electromagnetic relay (91) for controlling the electromagnetic relay to be switched on and off, and the electromagnetic relay (91) is electrically connected with the monitoring PLC (3).
6. The DCS-based automation system control cabinet of claim 5, wherein: the electromagnetic switch (9) is connected in series with a mechanical temperature control switch (92).
7. The DCS-based automation system control cabinet of claim 1, further comprising: the display (4) adopts a touch display screen.
8. The DCS-based automation system control cabinet of claim 7, further comprising: the keyboard tray is characterized by further comprising a touch pen (41) used for performing touch operation on the display (4), and an accommodating groove (61) for accommodating the touch pen (41) is formed in the upper surface of the keyboard tray (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911159777.1A CN110989516A (en) | 2019-11-22 | 2019-11-22 | DCS-based automatic system control cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911159777.1A CN110989516A (en) | 2019-11-22 | 2019-11-22 | DCS-based automatic system control cabinet |
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| CN110989516A true CN110989516A (en) | 2020-04-10 |
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| CN201911159777.1A Pending CN110989516A (en) | 2019-11-22 | 2019-11-22 | DCS-based automatic system control cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112859725A (en) * | 2021-01-04 | 2021-05-28 | 中国核电工程有限公司 | Plant equipment state characteristic signal monitoring system |
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| CN207718682U (en) * | 2017-10-25 | 2018-08-10 | 长沙汽车工业学校 | A kind of PLC teaching programmings platform |
| CN209343187U (en) * | 2018-12-07 | 2019-09-03 | 麒盛科技股份有限公司 | A kind of beddo driver equipment for testing service life centralized control operation cabinet |
-
2019
- 2019-11-22 CN CN201911159777.1A patent/CN110989516A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615068A (en) * | 2014-12-24 | 2015-05-13 | 中华人民共和国余姚出入境检验检疫局 | Water heater overtemperature protection durability test system |
| CN206516196U (en) * | 2016-09-20 | 2017-09-22 | 玉溪师范学院 | Automate autonomic nerve way stage apparatus |
| CN207053005U (en) * | 2017-05-10 | 2018-02-27 | 李敏 | A kind of electric automatization switch board with automatic fire-extinguishing function |
| CN207718682U (en) * | 2017-10-25 | 2018-08-10 | 长沙汽车工业学校 | A kind of PLC teaching programmings platform |
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Application publication date: 20200410 |
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