CN216348826U - Explosion-proof electrical inspection environment testing and early warning system - Google Patents
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Abstract
The utility model provides an explosion-proof electrical inspection environment testing and early warning system, and relates to the technical field of explosion-proof electrical inspection environment monitoring. The system comprises a DSP minimum system, an environmental data acquisition unit, a signal processing circuit, a warning circuit, a display module and a power supply unit; the environment data acquisition unit is arranged in an explosion-proof electrical inspection environment and is connected with the signal processing circuit, and the output end of the signal processing circuit is electrically connected with the environment signal input end of the DSP minimum system; the signal input ends of the warning circuit and the display module are electrically connected with the signal output end of the DSP minimum system; the voltage output end of the power supply unit is electrically connected with the power supply input terminal of the DSP minimum system, the power supply input terminal of the warning circuit, the power supply input terminal of the display module, the power supply input end of the environmental data acquisition unit and the power supply input terminal of the signal processing circuit respectively. The system monitors environmental data in real time through a DSP minimum system, processes the data, and performs early warning or alarming when the temperature or the humidity exceeds.
Description
Technical Field
The utility model relates to the technical field of monitoring of explosion-proof electrical inspection environments, in particular to an explosion-proof electrical inspection environment testing and early warning system.
Background
The explosion-proof electric appliance mainly refers to electric equipment used in dangerous places and flammable and explosive places. The explosion-proof electricity is mainly divided into an explosion-proof motor, an explosion-proof transformer, explosion-proof switch equipment, an explosion-proof lamp and the like, and is mainly used in places containing flammable and explosive gases and dust, such as coal, petroleum, chemical engineering and the like. Explosion-proof electrical devices are basically divided into two main categories: the explosion-proof electricity for the mine is mainly applied to places with explosive gases such as coal mines and mines with gas outburst, and the explosion-proof electricity for the factory is mainly applied to all places except the mines and the coal mines.
The reliability and safety of the explosion-proof electric appliance are far higher than those of ground equipment because the using environment contains explosive gases such as gas, natural gas and the like. Before the explosion-proof electrical product is put into operation, explosion-proof certification is required, and the national standard provides clear requirements for the temperature and the humidity of the test environment of the explosion-proof certification. At present, the temperature and humidity of the environment of the authentication test of the explosion-proof electrical product depend on a temperature and humidity meter, and the temperature and humidity data are manually recorded in the test process. Whether the temperature and the humidity meet the test conditions needs manual judgment, the test process is complex, the continuity is poor, the automation level is low, hidden dangers are brought to explosion-proof electrical safety certification, and the smooth development of detection and inspection work is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an explosion-proof electrical inspection environment testing and early warning system aiming at the defects of the prior art, and realizing the testing and early warning of the explosion-proof electrical inspection environment.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the explosion-proof electrical inspection environment testing and early warning system comprises a DSP minimum system, an environment data acquisition unit, a signal processing circuit, a warning circuit, a display module and a power supply unit; the environment data acquisition unit is arranged in an explosion-proof electrical inspection environment and is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is electrically connected with the environment signal input end of the DSP minimum system; the signal input ends of the warning circuit and the display module are electrically connected with the signal output end of the DSP minimum system; and the voltage output end of the power supply unit is electrically connected with the power supply input terminal of the DSP minimum system, the power supply input terminal of the warning circuit, the power supply input terminal of the display module, the power supply input terminal of the environmental data acquisition unit and the power supply input terminal of the signal processing circuit respectively.
Preferably, the environmental data acquisition unit comprises a humidity sensor and a temperature sensor, the testing end of which is arranged in the explosion-proof electrical inspection environment; the temperature data output end of the temperature sensor is electrically connected with the temperature data input end of the signal processing circuit, and the humidity data output end of the humidity sensor is electrically connected with the humidity data input end of the signal processing circuit.
Preferably, the warning circuit comprises a microprocessor NE555, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a triode Q1, a light emitting diode D1, a ground terminal GND1, a ground terminal GND2 and a buzzer; the alarm signal output end of the minimum DSP system is electrically connected with one end of a microprocessor NE555 terminal 4 and one end of a resistor R2, the other end of a resistor R2 is electrically connected with one end of a resistor R1, one end of a microprocessor NE555 terminal 1 and a triode Q1 terminal 2, the other end of a resistor R1 is electrically connected with one end of a resistor R4 and a microprocessor NE555 terminal 7, the other end of a resistor R4 is electrically connected with one end of a capacitor C1, one end of a capacitor C2 and a microprocessor NE555 terminal 5, the microprocessor NE555 terminal 2 is electrically connected with the other end of a capacitor C1, the other end of a capacitor C2 and a ground terminal GND2, a microprocessor NE555 terminal 3 is electrically connected with one end of a resistor R3, the other end of a resistor R3 is electrically connected with a triode Q1 terminal 1, a triode Q1 terminal 3 is electrically connected with one end of a resistor R5 and a terminal 1 of a buzzer, the other end of a resistor R5 is electrically connected with one end of a light emitting diode D1, the other end of a light emitting diode D1 is electrically connected with a ground terminal GND1, The terminal 2 of the buzzer is electrically connected.
Preferably, the signal processing circuit comprises a dual operational amplifier LM358A, a dual operational amplifier LM358B, a linear optocoupler HCNR-201, a resistor R7, a resistor R8, a resistor R9, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a power supply VCC1, a power supply VCC2, a power supply VCC3, a power supply VCC4, a ground terminal GND3, a ground terminal GND4, a ground terminal GND5, a ground terminal GND6, and a ground terminal GND 7; an output signal of the temperature sensor or the humidity sensor is electrically connected with a terminal 3 of a dual operational amplifier LM358A, one end of a resistor R7 is electrically connected with a terminal 1 of a linear optocoupler HCNR-201, the other end of a resistor R7 is electrically connected with a terminal 2 of the dual operational amplifier LM358A and a terminal 4 of the linear optocoupler HCNR-201, the terminal 4 of the dual operational amplifier LM358A is electrically connected with a ground terminal GND7, a terminal 7 of a dual operational amplifier LM358A is electrically connected with a power supply VCC1, one end of a capacitor C7, one end of a capacitor C8 and one end of a resistor R8, the other end of a capacitor C8 is electrically connected with a terminal 6 of the dual operational amplifier LM358A, the other end of the capacitor C7 is electrically connected with a ground terminal GND3, the other end of the resistor R8 is electrically connected with a terminal 2 of the linear HCNR-201, a terminal 3 of the linear optocoupler HCNR-2 is electrically connected with the power supply VCC3, a terminal 6 of the linear optocoupler 39201 is electrically connected with the power supply VCC3, One end of a capacitor C9 is electrically connected, the other end of a capacitor C9 is electrically connected to a ground terminal GND4, a terminal 5 of a linear optocoupler HCNR-201 is electrically connected to one end of a resistor R9 and a terminal 3 of a dual operational amplifier LM358B, the other end of a resistor R9 is electrically connected to a ground terminal GND5, a terminal 7 of the dual operational amplifier LM358B is electrically connected to a power supply VCC4 and one end of a capacitor C10, the other end of a capacitor C10 is electrically connected to a ground terminal GND6, and a terminal 2 of the dual operational amplifier LM358B is electrically connected to a terminal 6 of the dual operational amplifier LM358B and a signal input end of the minimum DSP system.
Preferably, the DSP minimum system comprises a DSP chip, and a reset circuit, a JTAG simulation interface, a clock circuit and a power circuit which are connected with the DSP chip.
Preferably, the explosion-proof electrical inspection environment testing and early warning system further comprises an instruction input unit, and a control instruction signal output end of the instruction input unit is electrically connected with a control signal input end of the DSP minimum system.
Preferably, the explosion-proof electrical inspection environment testing and early warning system further comprises a communication module and a remote monitoring computer; the communication signal input end of the communication module is electrically connected with the communication signal output end of the DSP minimum system, and the communication signal output end of the communication module is electrically connected with the communication signal input end of the remote monitoring computer; and the power input terminal of the communication module is electrically connected with the voltage output end of the power supply unit.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the explosion-proof electrical inspection environment testing and early warning system provided by the utility model, the temperature and humidity data of the explosion-proof electrical inspection environment are monitored in real time through the DSP minimum system, then data processing is carried out, and early warning or alarming is carried out when the temperature or the humidity exceeds; the system has the advantages of convenience in operation, simple structure, good stability, high automation degree and the like, improves the explosion-proof electrical inspection efficiency and the automation level, reduces the workload of personnel, and is favorable for the development of automation technology in the explosion-proof electrical inspection industry.
Drawings
Fig. 1 is a block diagram of an explosion-proof electrical inspection environment testing and early warning system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a signal processing circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an alarm circuit according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In this embodiment, the explosion-proof electrical inspection environment testing and early warning system, as shown in fig. 1, includes a DSP minimum system, an environmental data acquisition unit, a signal processing circuit, a warning circuit, an instruction input unit, a display module, a power supply unit, a communication module, and a remote monitoring computer; the environment data acquisition unit comprises a humidity sensor and a temperature sensor, wherein the test end of the humidity sensor and the temperature sensor are arranged in the explosion-proof electrical inspection environment and are used for acquiring the humidity and the temperature in the explosion-proof electrical inspection environment; the temperature data output end of the temperature sensor is electrically connected with the temperature data input end of the signal processing circuit, and the humidity data output end of the humidity sensor is electrically connected with the humidity data input end of the signal processing circuit; the output end of the signal processing circuit is electrically connected with the environment signal input end of the DSP minimum system; the signal input ends of the warning circuit and the display module are electrically connected with the signal output end of the DSP minimum system; the control instruction signal output end of the instruction input unit is electrically connected with the control signal input end of the DSP minimum system; the communication signal input end of the communication module is electrically connected with the communication signal output end of the DSP minimum system, and the communication signal output end of the communication module is electrically connected with the communication signal input end of the remote monitoring computer; the voltage output end of the power supply unit is electrically connected with the power supply input terminal of the DSP minimum system, the power supply input terminal of the communication module, the power supply input terminal of the warning circuit, the power supply input terminal of the display module, the power supply input terminal of the humidity sensor, the power supply input terminal of the temperature sensor and the power supply input terminal of the signal processing circuit respectively.
Because the output signals of the humidity sensor and the temperature sensor are not matched with the DSP minimum system, the signal processing circuit is used for realizing temperature signal and humidity signal conversion and isolation filtering processing. The signal processing processes of the humidity sensor and the temperature sensor are the same. The signal processing circuit is shown in fig. 2 and comprises a dual operational amplifier LM358A, a dual operational amplifier LM358B, a linear optocoupler HCNR-201, a resistor R7, a resistor R8, a resistor R9, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a power supply VCC1, a power supply VCC2, a power supply VCC3, a power supply VCC4, a ground terminal GND3, a ground terminal GND4, a ground terminal GND5, a ground terminal GND6 and a ground terminal GND 7; an output signal of the temperature sensor or the humidity sensor is electrically connected with a terminal 3 of a dual operational amplifier LM358A, one end of a resistor R7 is electrically connected with a terminal 1 of a linear optical coupler HCNR-201, the other end of a resistor R7 is electrically connected with a terminal 2 of the dual operational amplifier LM358A and a terminal 4 of the linear optical coupler HCNR-201, the terminal 4 of the dual operational amplifier LM358A is electrically connected with a ground terminal GND7, a terminal 7 of the dual operational amplifier LM358A is electrically connected with a power supply VCC1, one end of a capacitor C7, one end of a capacitor C8 and one end of a resistor R8, the other end of a capacitor C8 is electrically connected with a terminal 6 of the dual operational amplifier LM358A, the other end of the capacitor C7 is electrically connected with a ground terminal GND3, the other end of the resistor R8 is electrically connected with a terminal 2 of the linear optical coupler HCNR-201, a terminal 3 of the linear optical coupler HCNR-201 is electrically connected with a power supply VCC2, a terminal 6 of the linear optical coupler HCNR-201 is electrically connected with a power supply VCC3, One end of a capacitor C9 is electrically connected, the other end of a capacitor C9 is electrically connected to a ground terminal GND4, a terminal 5 of a linear optocoupler HCNR-201 is electrically connected to one end of a resistor R9 and a terminal 3 of a dual operational amplifier LM358B, the other end of a resistor R9 is electrically connected to a ground terminal GND5, a terminal 7 of the dual operational amplifier LM358B is electrically connected to a power supply VCC4 and one end of a capacitor C10, the other end of a capacitor C10 is electrically connected to a ground terminal GND6, and a terminal 2 of the dual operational amplifier LM358B is electrically connected to a terminal 6 of the dual operational amplifier LM358B and a signal input end of the minimum DSP system.
The working process of the signal processing circuit is as follows: after the signal processing circuit receives output signals of the temperature sensor and the humidity sensor, the dual operational amplifier LM358A carries out amplitude conversion on the signals and then sends the signals to the linear optical coupler HCNR201, the linear optical coupler HCNR201 isolates the signals and then sends the signals to the dual operational amplifier LM358B, and the dual operational amplifier LM358B carries out amplitude conversion on the signals and then sends the signals to the DSP minimum system; the capacitor and the resistor in the signal processing circuit are used for signal filtering, shunting and current limiting; the power supply terminal and the ground terminal provide an operating power supply and a reliable ground for the current.
The DSP minimum system consists of a DSP chip and a basic peripheral circuit and an interface thereof, and if any part of the DSP chip is removed, the DSP minimum system cannot become an independent DSP system to work; in this embodiment, the DSP minimum system includes a DSP chip, and a reset circuit, a JTAG emulation interface, a clock circuit, and a power circuit connected to the DSP chip. The DSP minimum system receives temperature and humidity signals fed back by the temperature sensor and the humidity sensor processed by the signal processing circuit, then performs data conversion, converts the temperature and humidity signals into temperature and humidity data, compares the temperature and humidity data with a set value, sends a 0V instruction signal to the warning circuit when the temperature and humidity data are far smaller than the set value, sends a 0.8V instruction signal to the warning circuit when the temperature and humidity data reach the set value, and sends a 1.6V instruction signal to the warning circuit when the temperature and humidity data exceed the set value.
The warning circuit is shown in fig. 3 and comprises a microprocessor NE555, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a triode Q1, a light emitting diode D1, a ground terminal GND1, a ground terminal GND2 and a buzzer; the alarm signal output end of the minimum DSP system is electrically connected with one end of a microprocessor NE555 terminal 4 and one end of a resistor R2, the other end of a resistor R2 is electrically connected with one end of a resistor R1, one end of a microprocessor NE555 terminal 1 and a triode Q1 terminal 2, the other end of a resistor R1 is electrically connected with one end of a resistor R4 and a microprocessor NE555 terminal 7, the other end of a resistor R4 is electrically connected with one end of a capacitor C1, one end of a capacitor C2 and a microprocessor NE555 terminal 5, the microprocessor NE555 terminal 2 is electrically connected with the other end of a capacitor C1, the other end of a capacitor C2 and a ground terminal GND2, a microprocessor NE555 terminal 3 is electrically connected with one end of a resistor R3, the other end of a resistor R3 is electrically connected with a triode Q1 terminal 1, a triode Q1 terminal 3 is electrically connected with one end of a resistor R5 and a terminal 1 of a buzzer, the other end of a resistor R5 is electrically connected with one end of a light emitting diode D1, the other end of a light emitting diode D1 is electrically connected with a ground terminal GND1, The terminal 2 of the buzzer is electrically connected.
The working process of the warning circuit is as follows: the microprocessor NE555 receives the DSP minimum system instruction (analog signal which is divided into three-gear instruction signals of 0V, 0.8V and 1.6V) and then carries out processing judgment, if the 0V signal is received, the judgment is that the humidity and the temperature in the explosion-proof electrical inspection environment are normal, and no early warning alarm is carried out; if the 0.8V signal is received, judging that the humidity and the temperature in the explosion-proof electrical inspection environment reach set values, and triggering a light-emitting diode D1 to flicker for early warning; if the 1.6V signal is received, the humidity and the temperature in the explosion-proof electrical inspection environment are judged to exceed the set values, and the buzzer is triggered to sound for alarming. The capacitor and the resistor of the warning circuit are used for signal filtering, voltage division and shunt current limiting; the power supply terminal and the ground terminal provide an operating power supply and a reliable ground for the current.
In this embodiment, the explosion-proof electrical inspection environment testing and early warning system automatically judges whether the environment temperature and humidity meet the standard requirements through a set value input by the instruction input unit, performs light emitting diode flicker early warning when the temperature and humidity data reach the set value, sounds a buzzer to give an alarm when the temperature and humidity data exceed the set value, and simultaneously can transmit the temperature and humidity data of the environment to the remote monitoring computer through the communication module for data storage.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (7)
1. The utility model provides an explosion-proof electrical inspection environmental test and early warning system which characterized in that: the intelligent alarm system comprises a DSP minimum system, an environmental data acquisition unit, a signal processing circuit, a warning circuit, a display module and a power supply unit; the environment data acquisition unit is arranged in an explosion-proof electrical inspection environment and is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is electrically connected with the environment signal input end of the DSP minimum system; the signal input ends of the warning circuit and the display module are electrically connected with the signal output end of the DSP minimum system; and the voltage output end of the power supply unit is electrically connected with the power supply input terminal of the DSP minimum system, the power supply input terminal of the warning circuit, the power supply input terminal of the display module, the power supply input terminal of the environmental data acquisition unit and the power supply input terminal of the signal processing circuit respectively.
2. The explosion-proof electrical inspection environment testing and early warning system of claim 1, wherein: the environment data acquisition unit comprises a humidity sensor and a temperature sensor, and the testing end of the humidity sensor and the temperature sensor are arranged in an explosion-proof electrical inspection environment; the temperature data output end of the temperature sensor is electrically connected with the temperature data input end of the signal processing circuit, and the humidity data output end of the humidity sensor is electrically connected with the humidity data input end of the signal processing circuit.
3. The explosion-proof electrical inspection environment testing and early warning system of claim 1, wherein: the warning circuit comprises a microprocessor NE555, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a triode Q1, a light-emitting diode D1, a ground terminal GND1, a ground terminal GND2 and a buzzer; the alarm signal output end of the minimum DSP system is electrically connected with one end of a microprocessor NE555 terminal 4 and one end of a resistor R2, the other end of a resistor R2 is electrically connected with one end of a resistor R1, one end of a microprocessor NE555 terminal 1 and a triode Q1 terminal 2, the other end of a resistor R1 is electrically connected with one end of a resistor R4 and a microprocessor NE555 terminal 7, the other end of a resistor R4 is electrically connected with one end of a capacitor C1, one end of a capacitor C2 and a microprocessor NE555 terminal 5, the microprocessor NE555 terminal 2 is electrically connected with the other end of a capacitor C1, the other end of a capacitor C2 and a ground terminal GND2, a microprocessor NE555 terminal 3 is electrically connected with one end of a resistor R3, the other end of a resistor R3 is electrically connected with a triode Q1 terminal 1, a triode Q1 terminal 3 is electrically connected with one end of a resistor R5 and a terminal 1 of a buzzer, the other end of a resistor R5 is electrically connected with one end of a light emitting diode D1, the other end of a light emitting diode D1 is electrically connected with a ground terminal GND1, The terminal 2 of the buzzer is electrically connected.
4. The explosion-proof electrical inspection environment testing and early warning system of claim 2, wherein: the signal processing circuit comprises a dual operational amplifier LM358A, a dual operational amplifier LM358B, a linear optocoupler HCNR-201, a resistor R7, a resistor R8, a resistor R9, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a power supply VCC1, a power supply VCC2, a power supply VCC3, a power supply VCC4, a ground terminal GND3, a ground terminal GND4, a ground terminal GND5, a ground terminal GND6 and a ground terminal GND 7; an output signal of the temperature sensor or the humidity sensor is electrically connected with a terminal 3 of a dual operational amplifier LM358A, one end of a resistor R7 is electrically connected with a terminal 1 of a linear optocoupler HCNR-201, the other end of a resistor R7 is electrically connected with a terminal 2 of the dual operational amplifier LM358A and a terminal 4 of the linear optocoupler HCNR-201, the terminal 4 of the dual operational amplifier LM358A is electrically connected with a ground terminal GND7, a terminal 7 of a dual operational amplifier LM358A is electrically connected with a power supply VCC1, one end of a capacitor C7, one end of a capacitor C8 and one end of a resistor R8, the other end of a capacitor C8 is electrically connected with a terminal 6 of the dual operational amplifier LM358A, the other end of the capacitor C7 is electrically connected with a ground terminal GND3, the other end of the resistor R8 is electrically connected with a terminal 2 of the linear HCNR-201, a terminal 3 of the linear optocoupler HCNR-2 is electrically connected with the power supply VCC3, a terminal 6 of the linear optocoupler 39201 is electrically connected with the power supply VCC3, One end of a capacitor C9 is electrically connected, the other end of a capacitor C9 is electrically connected to a ground terminal GND4, a terminal 5 of a linear optocoupler HCNR-201 is electrically connected to one end of a resistor R9 and a terminal 3 of a dual operational amplifier LM358B, the other end of a resistor R9 is electrically connected to a ground terminal GND5, a terminal 7 of the dual operational amplifier LM358B is electrically connected to a power supply VCC4 and one end of a capacitor C10, the other end of a capacitor C10 is electrically connected to a ground terminal GND6, and a terminal 2 of the dual operational amplifier LM358B is electrically connected to a terminal 6 of the dual operational amplifier LM358B and a signal input end of the minimum DSP system.
5. The explosion-proof electrical inspection environment testing and early warning system of claim 1, wherein: the DSP minimum system comprises a DSP chip, and a reset circuit, a JTAG simulation interface, a clock circuit and a power circuit which are connected with the DSP chip.
6. The explosion-proof electrical inspection environment testing and early warning system of claim 1, wherein: the explosion-proof electrical inspection environment testing and early warning system further comprises an instruction input unit, and a control instruction signal output end of the instruction input unit is electrically connected with a control signal input end of the DSP minimum system.
7. The explosion-proof electrical inspection environment testing and early warning system of any one of claims 2-6, wherein: the explosion-proof electrical inspection environment testing and early warning system also comprises a communication module and a remote monitoring computer; the communication signal input end of the communication module is electrically connected with the communication signal output end of the DSP minimum system, and the communication signal output end of the communication module is electrically connected with the communication signal input end of the remote monitoring computer; and the power input terminal of the communication module is electrically connected with the voltage output end of the power supply unit.
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| CN202122889505.6U CN216348826U (en) | 2021-11-24 | 2021-11-24 | Explosion-proof electrical inspection environment testing and early warning system |
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| CN202122889505.6U CN216348826U (en) | 2021-11-24 | 2021-11-24 | Explosion-proof electrical inspection environment testing and early warning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024041552A1 (en) * | 2022-08-23 | 2024-02-29 | 中煤科工集团沈阳研究院有限公司 | Temperature test system and method under most unfavorable condition for explosion-proof light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024041552A1 (en) * | 2022-08-23 | 2024-02-29 | 中煤科工集团沈阳研究院有限公司 | Temperature test system and method under most unfavorable condition for explosion-proof light |
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