CN115389045A - Temperature test system and test method for explosion-proof lamp under worst condition - Google Patents

Abstract

The invention provides a temperature testing system and a testing method of an explosion-proof lamp under the most unfavorable conditions, and relates to the technical field of temperature testing of an explosion-proof lamp. The system includes PIC microcontroller, two thermocouple units, multi-channel power supply device, thermal imager, pressure sensor, humidity sensor, voltage transformer, current transformer, display screen, mobile module, communication unit, industrial computer, human-computer interaction Panel and sound and light warning unit; PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps run at full power, ensuring that the temperature test process of explosion-proof induction lamps is always under the most unfavorable conditions; when the current, voltage, pressure and humidity When the data are all within the set value range, the PIC microcontroller receives the ambient temperature collected by the two thermocouple units and the temperature data under the most unfavorable conditions of the explosion-proof lamps, and processes the ambient temperature to obtain the temperature data under the most unfavorable conditions of the explosion-proof lamps, and then judges Whether the temperature test is qualified.

Description

Temperature test system and test method for explosion-proof lamps under the most unfavorable conditions

technical field

The invention relates to the technical field of temperature testing of explosion-proof lamps, in particular to a temperature testing system and method for explosion-proof lamps under the most unfavorable conditions.

Background technique

Explosion-proof lamps refer to explosion-proof roadway lights, flame-proof bracket lights, flame-proof lighting signal lights and flame-proof emergency lights used in explosive places. They are widely used in flammable and explosive places such as coal mines, chemicals, and petroleum. application. The explosion-proof shell structure not only prevents the internal electric spark of the explosion-proof lamp from igniting the external explosive gas, but also avoids the damage of the explosion-proof lamp from the external environment explosion, and ensures the safe operation of the explosion-proof lamp in the explosive place. However, due to the structure of the explosion-proof shell, the internal heat cannot be dissipated in time. At the same time, there is no natural lighting underground, and the explosion-proof lamps are in a 24-hour operating state, especially in explosive places. The temperature is much higher than that of ground lighting.

The national standard GB/T3836.1-2021 "Explosive Atmosphere Part 1: General Requirements for Equipment" clearly stipulates that the surface temperature of explosion-proof lamps should not exceed 150°C under the most unfavorable conditions. At present, the maximum surface temperature test of explosion-proof lamps uses infrared spot thermometers to test temperature data, and the selection of test points is inaccurate (explosion-proof lamps have complex structures and large maximum surface areas, and spot thermometers can only select test points based on experience), and manual records are required. Experimental data and judging whether the test is completed or not lead to heavy workload in the test process, low accuracy of test data, and poor reliability of test results, which brings accident hazards to the safe operation of explosion-proof lamps used in explosive places. In addition, for energy-saving explosion-proof sensor lamps, it is necessary to manually trigger the light-emitting side of the lamp to ensure that the temperature test process is under the most unfavorable conditions. The temperature test takes several hours (usually more than 4 hours) to complete, which increases the workload of the testers. , which reduces the testing efficiency and hinders the intelligent development of the testing and testing industry.

Contents of the invention

The technical problem to be solved by the present invention is to provide a temperature testing system and testing method for explosion-proof lamps under the most unfavorable conditions to realize the temperature testing of explosion-proof lamps under the most unfavorable conditions in view of the deficiencies of the above-mentioned prior art.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

On the one hand, the present invention provides a temperature testing system under the most unfavorable conditions for an explosion-proof lamp, including a PIC microcontroller, a thermocouple unit A, a thermocouple unit B, a multi-channel power supply device, a thermal imager, a pressure sensor, a humidity sensor, a voltage transformer, a current Transformer, display screen, mobile module, communication unit, industrial computer, human-computer interaction panel and sound and light warning unit; among them, the test terminals of thermocouple unit A and thermocouple unit B are respectively placed on the surface of explosion-proof lamps and the test environment, The temperature data output terminals of thermocouple unit A and thermocouple unit B are electrically connected with the temperature data input terminal of PIC single-chip microcomputer; The sound and light warning unit and the power input terminal of the explosion-proof lamp are electrically connected; the test terminals of the pressure sensor and the humidity sensor are placed in the test environment, and the pressure signal output terminal of the pressure sensor and the humidity signal output terminal of the humidity sensor are respectively connected with the pressure of the PIC microcontroller. The signal input terminal is electrically connected to the humidity signal input terminal; the test terminal of the voltage transformer is electrically connected to the power input terminal of the explosion-proof lamp, and the voltage signal output terminal is electrically connected to the voltage signal input terminal of the PIC microcontroller; the test terminal of the current transformer is connected to the explosion-proof lamp. The power supply line of the lamp is connected in series, and the current signal output terminal is electrically connected with the current signal input terminal of the PIC microcontroller; the signal input terminal of the display screen is electrically connected with the signal output terminal of the PIC microcontroller; The data received by the PIC microcontroller; the control signal output terminal of the human-computer interaction panel is connected to the multi-channel power supply device and the PIC microcontroller; the signal input terminal of the sound and light warning unit is electrically connected to the warning signal output terminal of the PIC microcontroller; the thermal imager test The real-time imaging test end is facing the surface of the explosion-proof electrical appliance; the mobile module runs on the front of the glass cover of the explosion-proof lamp.

Preferably, the thermocouple unit A and the thermocouple unit B both include two thermocouples, which are respectively used to test the temperature of the surface of the explosion-proof lamp and the test environment; the two thermocouples of the thermocouple unit A are pasted on the shell of the explosion-proof lamp and The surface of the two test points of the glass cover; the two thermocouples of the thermocouple unit B are placed on both sides of the explosion-proof lamp 1 meter away from the same horizontal plane to test the temperature of the test environment;

Preferably, both the voltage transformer and the current transformer are passive transformers for testing the voltage and current of explosion-proof lamps;

Preferably, the pressure sensor and the humidity sensor are respectively used to test the pressure and humidity of the test environment;

Preferably, the display screen is used to display the working state of the system, the temperature of the test environment, the humidity of the test environment, the pressure of the test environment, the temperature data on the shell of the explosion-proof lamp and the glass cover;

Preferably, the human-computer interaction panel is used to start, test and stop the power supply control and test system, including the start and stop buttons of the multi-channel power supply device, the PIC microcontroller power start control button, the explosion-proof lamp power start control button, the display Screen power start control button, industrial computer power start control button, test system start, test and stop button, emergency stop button.

On the other hand, the present invention also provides a method for testing the temperature of an explosion-proof lamp under the most unfavorable conditions, comprising the following steps:

Step 1. Start the multi-channel power supply device power supply, PIC microcontroller power supply, display power supply, and industrial computer power supply through the human-computer interaction panel, select the power supply line according to the voltage level of the explosion-proof lamp, and start the explosion-proof lamp power supply;

Step 2. The PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps run at full power, ensuring that the temperature test process of the explosion-proof induction lamps is always under the most unfavorable conditions;

Step 3. The PIC microcontroller receives the electrical signals collected by the current transformer, voltage transformer, pressure sensor, and humidity sensor, converts the electrical signal into corresponding current, voltage, pressure, and humidity data, and stops the explosion-proof lamp when any data exceeds the set value Temperature test under the most unfavorable conditions, and a system fault prompt will be given on the display screen, and the sound and light warning unit will give a sound and light warning; when the current, voltage, pressure and humidity data are all within the set value range, perform step 4 and continue to run the explosion-proof Temperature test under the most unfavorable conditions of lamps;

Step 4. The PIC microcontroller receives the temperature data collected by thermocouple unit A and thermocouple unit B, and records the temperature test time under the most unfavorable conditions of the explosion-proof lamp, and prompts on the display screen when the test time reaches the set value;

Step 5. Use a thermal imager to find the highest temperature point on the explosion-proof lamp shell and glass cover, and fix the thermocouple unit A at the highest temperature point on the explosion-proof lamp shell and glass cover;

Step 6. The PIC microcontroller continues to receive the n temperature data t ₁ , t ₂ , ..., t _n collected by the thermocouple unit A, and calculates the temperature data difference within this period after the temperature data is collected for 1 hour, and then judges Whether the temperature test is completed under the most unfavorable conditions for explosion-proof lamps, the calculation method is as follows:

Δt=t _m+60 -t _m (1)

In the formula, t _m is the temperature data collected by the thermocouple unit A for the mth time, and m is a positive integer in the interval from 1 to n-60; t _m+60 is the temperature data collected by the thermocouple unit A for the m+60th time; Δt is the temperature data difference between the m+60th and mth collection of thermocouple unit A;

The PIC microcontroller compares the value between Δt and 1. If Δt is greater than or equal to 1, the PIC microcontroller controls thermocouple unit A and thermocouple unit B to continue collecting ambient temperature and temperature data under the most unfavorable conditions of the explosion-proof lamp, and executes step 7. If Δt is less than 1, the temperature test under the most unfavorable conditions for explosion-proof lamps ends; t _n is the actual temperature under the most unfavorable conditions for explosion-proof lamps;

Step 7. The PIC microcontroller receives thermocouple unit A and thermocouple unit B in real time to collect ambient temperature and temperature data under the most unfavorable conditions of explosion-proof lamps, and processes the ambient temperature to obtain the average temperature within a quarter of the time after the temperature test, and The temperature data of explosion-proof lamps under the most unfavorable conditions can be converted, as shown in the following formula:

Among them, _Tw is the temperature under the most unfavorable condition of explosion-proof lamps; _T1 is the first temperature of the environment within a quarter of the time after the most unfavorable temperature test of explosion-proof lamps; _T2 is the quarter after the most unfavorable temperature test of explosion-proof lamps The second temperature of the environment within a period of time; T _g is the last temperature of the environment within a quarter of the time after the most unfavorable temperature test of the explosion-proof lamp; g is the collected ambient temperature within a quarter of the time after the most unfavorable temperature test of the explosion-proof lamp quantity;

Step 8. The PIC microcontroller compares the temperature under the most unfavorable conditions of explosion-proof lamps with the data required by the temperature test standard for the most unfavorable conditions of explosion-proof lamps, and judges whether the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; If it is greater than the temperature under the most unfavorable conditions of explosion-proof lamps, the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; Test failed.

The specific method for the PIC single-chip microcomputer to control the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps in the full-power operating state is as follows:

Explosion-proof induction lamps are triggered by wireless drive mode. In the low-power operation state of explosion-proof induction lamps, the PIC single-chip microcomputer controls the mobile module to move along the straight line L in the direction of the circle tangent to the explosion-proof induction lamps as the center O of the circle, and finds two symmetrical to the circle center O. The sensing point of the explosion-proof sensor lamp, and moves back and forth within the range of two endpoints at a certain distance from the sensing points of the two explosion-proof sensor lamps;

In order to ensure that the temperature test process of the explosion-proof induction lamp is always under the most unfavorable conditions, the PIC microcontroller collects the voltage and current signals of the full-power operation and the temperature test process, and calculates the maximum power and operating power of the explosion-proof induction lamp, and then judges whether the explosion-proof induction lamp is in To run under the most unfavorable conditions, the specific method is:

Step S1. The PIC microcontroller receives the voltage and current signals collected by the current transformer and voltage transformer when the explosion-proof induction lamp is running at full power, and calculates the full power of the explosion-proof induction lamp. The calculation method is as follows:

P _max =U _max ×I _max (3)

Among them, P _max is the full power of the explosion-proof induction lamp; U _max is the voltage when the explosion-proof induction lamp is running at full power; I _max is the current when the explosion-proof induction lamp is running at full power;

Step S2, the PIC single-chip microcomputer receives the voltage and current data collected by the current transformer and voltage transformer in real time during the most unfavorable temperature test process of the explosion-proof induction lamp, and then obtains the operating power of the explosion-proof induction lamp. The calculation method is as follows:

P=U×I (4)

Among them, P is the operating power of explosion-proof induction lamps; U is the operating voltage of explosion-proof induction lamps; I is the operating current of explosion-proof induction lamps;

Step S3, the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp is made, as shown in the following formula:

ΔP=P _max -P (5)

Among them, ΔP is the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp;

If ΔP is less than or equal to zero, it is determined that the explosion-proof induction lamp is not operating at full power, and the most unfavorable temperature test for the explosion-proof induction lamp is stopped; if ΔP is greater than zero, it is determined that the explosion-proof induction lamp is operating at full power, and then step S4 is performed. Proceed to the worst-case temperature test for explosion-proof induction luminaires.

The beneficial effects produced by adopting the above-mentioned technical scheme are: the temperature testing system and testing method under the most unfavorable conditions of explosion-proof lamps provided by the present invention solve technical problems such as large temperature test workload and low test accuracy under the most unfavorable conditions of explosion-proof lamps, and improve Improve the temperature test ability and test level under the most unfavorable conditions, improve the test efficiency, save power resources, provide test verification technical support for the explosion-proof housing and component selection in the new product development process of explosion-proof lamps, ensure the quality of explosion-proof lamps, and promote testing The field of testing and explosion-proof lamps continues to develop healthily.

Description of drawings

Fig. 1 is a structural block diagram of a temperature testing system under the most unfavorable conditions for an explosion-proof lamp provided by an embodiment of the present invention;

Fig. 2 is the flowchart of the temperature testing method under the most unfavorable conditions of the explosion-proof lamp provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of a movement track of a mobile module provided by an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In this embodiment, the temperature test system under the most unfavorable conditions for explosion-proof lamps, as shown in Figure 1, includes a PIC microcontroller, thermocouple unit A, thermocouple unit B, multi-channel power supply device, thermal imager, pressure sensor, humidity sensor, Voltage transformer, current transformer, display screen, mobile module, communication unit, industrial computer, human-computer interaction panel and sound and light warning unit; among them, the test terminals of thermocouple unit A and thermocouple unit B are respectively placed on the surface of explosion-proof lamps and in the test environment, the temperature data output terminals of thermocouple unit A and thermocouple unit B are electrically connected with the temperature data input terminal of the PIC microcontroller; The power input terminals of PIC single-chip microcomputer, display screen, industrial computer, sound and light warning unit, and explosion-proof lamps are electrically connected to supply power for these electrical equipment; pressure sensors and humidity sensors are used to test the pressure and humidity of the test environment respectively; pressure sensors and humidity The test terminals of the sensors are all placed in the test environment, the pressure signal output terminal of the pressure sensor and the humidity signal output terminal of the humidity sensor are respectively electrically connected with the pressure signal input terminal and the humidity signal input terminal of the PIC microcontroller; the test terminal of the voltage transformer is connected with the The power input terminal of the explosion-proof lamp is electrically connected, the voltage signal output terminal is electrically connected to the voltage signal input terminal of the PIC microcontroller; the test terminal of the current transformer is connected in series with the power supply line of the explosion-proof lamp, and the current signal output terminal is connected to the current signal input terminal of the PIC microcontroller Electrical connection; voltage transformers and current transformers are high-precision passive transformers, used to test the voltage and current of explosion-proof lamps; the signal input terminal of the display screen is electrically connected with the signal output terminal of the PIC microcontroller to display the working status of the system (normal operation, failure, stop), test environment temperature, test environment humidity, test environment pressure, temperature data on explosion-proof lamp housing and glass cover;

The industrial computer is electrically connected to the PIC microcontroller through the communication unit to store the data received by the PIC microcontroller; the control signal output terminals of the human-computer interaction panel are respectively connected to the multi-channel power supply device and the PIC microcontroller; the signal input terminals of the sound and light warning unit are connected to the The warning signal output terminal of the PIC single-chip microcomputer is electrically connected; when the thermal imager is tested, the imaging test terminal is facing the surface of the explosion-proof electrical appliance; the mobile module runs on the front of the glass cover of the explosion-proof lamp under the control of the PIC single-chip microcomputer, and is used to make the explosion-proof induction lamp be in a full-power operating state .

The human-computer interaction panel is used to start, test and stop the power supply control and test system, including the power start and stop buttons of the multi-channel power supply device, the PIC microcontroller power start control button, the explosion-proof lamp power start control button, and the display power start control button , Industrial computer power start control button, test system start, test and stop button, emergency stop button.

In this embodiment, thermocouple unit A and thermocouple unit B both include two thermocouples, which are used to test the temperature of the surface of the explosion-proof lamp and the test environment respectively; the two thermocouples of thermocouple unit A are pasted on the The surface of the two test points, the shell of the explosion-proof lamp and the glass cover; the two thermocouples of the thermocouple unit B are placed on both sides of the explosion-proof lamp 1 meter away from the same horizontal plane to test the temperature of the test environment.

In this embodiment, the temperature test method for explosion-proof lamps under the most unfavorable conditions, as shown in Figure 2, includes the following steps:

Step 1. Start the multi-channel power supply device power supply, PIC microcontroller power supply, display power supply, and industrial computer power supply through the human-computer interaction panel, and select the appropriate power supply line to start the explosion-proof lamp power supply according to the voltage level of the explosion-proof lamp;

Step 2. The PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps run at full power, ensuring that the temperature test process of the explosion-proof induction lamps is always under the most unfavorable conditions;

Step 3. The PIC microcontroller receives the electrical signals collected by the current transformer, voltage transformer, pressure sensor, and humidity sensor, converts the electrical signal into corresponding current, voltage, pressure, and humidity data, and stops the explosion-proof lamp when any data exceeds the set value Temperature test under the most unfavorable conditions, and a system fault prompt will be given on the display screen, and the sound and light warning unit will give a sound and light warning; when the current, voltage, pressure and humidity data are all within the set value range, perform step 4 and continue to run the explosion-proof Temperature test under the most unfavorable conditions of lamps;

Step 4. The PIC microcontroller receives the temperature data collected by thermocouple unit A and thermocouple unit B (once per minute), and records the temperature test time under the most unfavorable conditions of the explosion-proof lamp. When the test time reaches the set value, it will be displayed on the display prompt on

Step 5. The tester uses a thermal imager to find the highest temperature point on the explosion-proof lamp shell and glass cover, and then uses heat-insulating tape to fix the thermocouple unit A on the explosion-proof lamp shell and the glass cover at the highest temperature point;

Step 6. The PIC microcontroller continues to receive the n temperature data t ₁ , t ₂ collected by the thermocouple unit A, ..., t _n , t _n is the actual temperature of the explosion-proof lamp under the most unfavorable conditions; it is calculated after 1 hour of temperature data collection The temperature data difference during this period can be used to determine whether the temperature test is over under the most unfavorable conditions for explosion-proof lamps. The calculation method is as follows:

Δt=t _m+60 -t _m (1)

In the formula, t _m is the temperature data collected by the thermocouple unit A for the mth time, m is a positive integer in the interval from 1 to n-60, and the unit is Celsius (°C); t _m+60 is the m+60th temperature data of the thermocouple unit A The temperature data collected for the first time, the unit is Celsius (°C); Δt is the temperature data difference between the m+60th and mth collection of thermocouple unit A, the unit is Celsius (°C);

The PIC microcontroller compares the value between Δt and 1. If Δt is greater than or equal to 1, the PIC microcontroller controls thermocouple unit A and thermocouple unit B to continue collecting ambient temperature and temperature data under the most unfavorable conditions of the explosion-proof lamp, and executes step 7. If Δt is less than 1, the temperature test under the most unfavorable conditions for explosion-proof lamps ends.

Step 7. The PIC microcontroller receives thermocouple unit A and thermocouple unit B in real time to collect ambient temperature and temperature data under the most unfavorable conditions of explosion-proof lamps, and processes the ambient temperature to obtain the average temperature within a quarter of the time after the temperature test (temperature The temperature data within a quarter of the time after the test is T ₁ , T ₂ , ..., T _g ), and then converted to obtain the temperature data under the most unfavorable conditions (+40°C) of the explosion-proof lamp, as shown in the following formula:

Among them, _Tw is the temperature under the most unfavorable condition of the explosion-proof lamp, the unit is Celsius (°C); _T1 is the first temperature of the environment within a quarter of the time after the most unfavorable condition temperature test of the explosion-proof lamp, the unit is Celsius (°C); T ₂ is the second ambient temperature within a quarter of the time after the most unfavorable temperature test for explosion-proof lamps, in degrees Celsius (°C); T _g is the last environmental temperature within a quarter of the time after the most unfavorable temperature test for explosion-proof lamps Temperature, the unit is Celsius (°C); g is the quantity of ambient temperature collected within a quarter of the most unfavorable condition temperature test for explosion-proof lamps, dimensionless;

Step 8. The PIC microcontroller compares the temperature under the most unfavorable conditions of explosion-proof lamps with the data required by the temperature test standard for the most unfavorable conditions of explosion-proof lamps, and judges whether the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; If it is greater than the temperature under the most unfavorable conditions of explosion-proof lamps, the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; Test failed.

Explosion-proof induction lamps are energy-saving special explosion-proof lamps. Explosion-proof induction lamps work in two power consumption stages. Before induction, they are in low-power energy-saving operation, and after induction, they are in full-power operation. Under the most unfavorable conditions, the temperature test should be performed at the stage of maximum power. , so it is necessary to trigger the sensing function of the explosion-proof induction lamps in real time, and calculate the power of the explosion-proof induction lamps according to the voltage and current to ensure that the explosion-proof induction lamps operate under the most unfavorable conditions.

In this embodiment, the specific method for the PIC microcontroller to control the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps run at full power is as follows:

The triggering of explosion-proof induction lamps adopts wireless drive mode, and the PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to ensure that the explosion-proof induction lamps are in a full-power operating state; Move on the straight line L in the tangent direction of the circle center O, (the mobile module is too close to the explosion-proof sensor lamp to affect the temperature test results, and the distance between the mobile module and the explosion-proof sensor lamp is too far to ensure that the explosion-proof sensor lamp is always in full-power operation. The temperature test results of the explosion-proof induction lamp affect and ensure that the explosion-proof induction lamp is always in full power operation condition, the vertical distance from L to the explosion-proof induction lamp is 2m) Find two induction points of the explosion-proof induction lamp symmetrical to the center O of the circle, and set them at a distance between two explosion-proof induction lamps The sensor light sensing point moves back and forth within the range of two endpoints at a certain distance;

In this embodiment, the method for determining the sensing points and the two endpoints of the two explosion-proof induction lamps is as shown in Figure 3, specifically:

The mobile module moves on the straight line L. When it moves to point A on the straight line L, the explosion-proof sensor lamp switches from low power consumption to full power operation state, then point A is the sensing point of the explosion-proof sensor lamp; the same method is used to find the sensor on the line L. The other side corresponding to point A (the direction opposite to point A and the same line as the center of the circle) is the sensing point D of the explosion-proof induction lamp. Mark the running track points B and C of the mobile module on the straight line L, where BO=0.6AO, CO=0.6DO, then B and C are the two endpoints of the running track of the mobile module, and the mobile module moves back and forth between points B and C.

In this embodiment, in order to ensure that the temperature test process of the explosion-proof induction lamp is always under the most unfavorable conditions, the PIC microcontroller collects the voltage and current signals of the full-power operation and the temperature test process, and calculates the maximum power and operating power of the explosion-proof induction lamp, and then judges Whether the explosion-proof induction lamps are operated under the most unfavorable conditions, the specific method is as follows:

Step S1. The PIC microcontroller receives the voltage and current signals collected by the current transformer and voltage transformer when the explosion-proof induction lamp is running at full power, and calculates the full power of the explosion-proof induction lamp. The calculation method is as follows:

P _max =U _max ×I _max (3)

Among them, P _max is the full power of the explosion-proof induction lamp, the unit is watt (w); U _max is the voltage of the explosion-proof induction lamp at full power operation, the unit is volt (V); I _max is the current of the explosion-proof induction lamp at full power operation, the unit is is the ampere (A). In this embodiment, the voltage and current when the explosion-proof induction lamp is running at full power are obtained by taking the average value of multiple voltage and current measurements. Generally, the voltage and current data when the explosion-proof induction lamp is running at full power are measured 5 times.

Step S2, the PIC microcontroller receives the voltage and current data collected by the current transformer and voltage transformer in real time during the most unfavorable temperature test process of the explosion-proof induction lamp, and then obtains the operating power of the explosion-proof induction lamp. The calculation method is as follows:

P=U×I (4)

Among them, P is the operating power of the explosion-proof induction lamp, and the unit is watt (w); U is the operating voltage of the explosion-proof induction lamp, and the unit is volt (V); I is the operating current of the explosion-proof induction lamp, and the unit is ampere (A).

Step S3, the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp is made, as shown in the following formula:

ΔP=P _max -P (5)

Among them, ΔP is the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp, in watts (w);

If ΔP is less than or equal to zero, it is determined that the explosion-proof induction lamp is not operating at full power, and the most unfavorable temperature test for the explosion-proof induction lamp is stopped; if ΔP is greater than zero, it is determined that the explosion-proof induction lamp is operating at full power, and then step S4 is performed. Proceed to the worst-case temperature test for explosion-proof induction luminaires.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope defined by the claims of the present invention.

Claims (9)

1. A temperature testing system under the most unfavorable conditions of an explosion-proof lamp, characterized in that: it includes a PIC microcontroller, a thermocouple unit A, a thermocouple unit B, a multi-channel power supply device, a thermal imager, a pressure sensor, a humidity sensor, and a voltage transformer , current transformer, display screen, mobile module, communication unit, industrial computer, human-computer interaction panel and sound and light warning unit; among them, the test terminals of thermocouple unit A and thermocouple unit B are respectively placed on the surface of explosion-proof lamps and the test environment Among them, the temperature data output terminals of thermocouple unit A and thermocouple unit B are electrically connected with the temperature data input terminal of PIC single-chip microcomputer; The computer, the sound and light warning unit, and the power input terminals of the explosion-proof lamps are electrically connected; the test terminals of the pressure sensor and the humidity sensor are placed in the test environment, and the pressure signal output terminal of the pressure sensor and the humidity signal output terminal of the humidity sensor are respectively connected to the PIC microcontroller. The pressure signal input terminal is electrically connected to the humidity signal input terminal; the test terminal of the voltage transformer is electrically connected to the power input terminal of the explosion-proof lamp, and the voltage signal output terminal is electrically connected to the voltage signal input terminal of the PIC microcontroller; the test terminal of the current transformer It is connected in series with the power supply line of the explosion-proof lamp, and the current signal output terminal is electrically connected with the current signal input terminal of the PIC microcontroller; the signal input terminal of the display screen is electrically connected with the signal output terminal of the PIC microcontroller; the industrial computer is electrically connected with the PIC microcontroller through the communication unit, It is used to store the data received by the PIC microcontroller; the control signal output terminal of the human-computer interaction panel is connected to the multi-channel power supply device and the PIC microcontroller respectively; the signal input terminal of the sound and light warning unit is electrically connected to the warning signal output terminal of the PIC microcontroller; thermal imaging During the instrument test, the imaging test end is facing the surface of the explosion-proof electrical appliance; the mobile module runs on the front of the explosion-proof lamp glass cover. 2. The temperature testing system for explosion-proof lamps under the most unfavorable conditions according to claim 1, characterized in that: said thermocouple unit A and thermocouple unit B both include two thermocouples, which are respectively used for testing the surface of explosion-proof lamps and testing The temperature of the environment; the two thermocouples of thermocouple unit A are pasted on the surface of the two test points of the explosion-proof lamp shell and the glass cover; the two thermocouples of thermocouple unit B are placed 1 meter away from the explosion-proof lamp at the same level The two side positions are used to test the temperature of the environment. 3. The temperature testing system for explosion-proof lamps under the most unfavorable conditions according to claim 1, characterized in that: said voltage transformer and current transformer are both passive transformers for testing the voltage and current of explosion-proof lamps. 4. The temperature testing system for explosion-proof lamps under the most unfavorable conditions according to claim 1, characterized in that: the pressure sensor and the humidity sensor are respectively used to test the pressure and humidity of the environment. 5. The temperature testing system for explosion-proof lamps under the most unfavorable conditions according to claim 1, characterized in that: the display screen is used to display the working state of the system, the temperature of the test environment, the humidity of the test environment, the pressure of the test environment, and the shell of the explosion-proof lamp and temperature data on the glass cover. 6. The temperature test system for explosion-proof lamps under the most unfavorable conditions according to claim 1, characterized in that: the human-computer interaction panel is used to realize the power supply control and the start, test and stop of the test system, including multi-channel power supply device power supply Start and stop button, PIC microcontroller power start control button, explosion-proof lamp power start control button, display power start control button, industrial computer power start control button, test system start, test and stop button, emergency stop button. 7. A method for testing the temperature of an explosion-proof lamp under the most unfavorable conditions, realized based on the test system of claim 1, comprising the following steps: Step 1. Start the multi-channel power supply device power supply, PIC microcontroller power supply, display power supply, and industrial computer power supply through the human-computer interaction panel, select the power supply line according to the voltage level of the explosion-proof lamp, and start the explosion-proof lamp power supply; Step 2. The PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps run at full power, ensuring that the temperature test process of the explosion-proof induction lamps is always under the most unfavorable conditions; Step 3. The PIC microcontroller receives the electrical signals collected by the current transformer, voltage transformer, pressure sensor, and humidity sensor, converts the electrical signal into corresponding current, voltage, pressure, and humidity data, and stops the explosion-proof lamp when any data exceeds the set value Temperature test under the most unfavorable conditions, and a system fault prompt will be given on the display screen, and the sound and light warning unit will give a sound and light warning; when the current, voltage, pressure and humidity data are all within the set value range, perform step 4 and continue to run the explosion-proof Temperature test under the most unfavorable conditions of lamps; Step 4. The PIC microcontroller receives the temperature data collected by thermocouple unit A and thermocouple unit B, and records the temperature test time under the most unfavorable conditions of the explosion-proof lamp, and prompts on the display screen when the test time reaches the set value; Step 5. Use a thermal imager to find the highest temperature point on the explosion-proof lamp shell and glass cover, and fix the thermocouple unit A at the highest temperature point on the explosion-proof lamp shell and glass cover; Step 6. The PIC microcontroller continues to receive the n temperature data t ₁ , t ₂ , ..., t _n collected by the thermocouple unit A, and calculates the temperature data difference within this period after the temperature data is collected for 1 hour, and then judges Whether the temperature test is completed under the most unfavorable conditions for explosion-proof lamps, the calculation method is as follows: Δt=t _m+60 -t _m (1) In the formula, t _m is the temperature data collected by the thermocouple unit A for the mth time, and m is a positive integer in the interval from 1 to n-60; t _m+60 is the temperature data collected by the thermocouple unit A for the m+60th time; Δt is the temperature data difference between the m+60th and mth collection of thermocouple unit A; The PIC microcontroller compares the value between Δt and 1. If Δt is greater than or equal to 1, the PIC microcontroller controls thermocouple unit A and thermocouple unit B to continue collecting ambient temperature and temperature data under the most unfavorable conditions of the explosion-proof lamp, and executes step 7. If Δt is less than 1, the temperature test under the most unfavorable conditions for explosion-proof lamps ends; t _n is the actual temperature under the most unfavorable conditions for explosion-proof lamps; Step 7. The PIC microcontroller receives thermocouple unit A and thermocouple unit B in real time to collect ambient temperature and temperature data under the most unfavorable conditions of explosion-proof lamps, and processes the ambient temperature to obtain the average temperature within a quarter of the time after the temperature test. And convert the temperature data under the most unfavorable conditions of explosion-proof lamps, as shown in the following formula:

Among them, _Tw is the temperature under the most unfavorable condition of explosion-proof lamps; _T1 is the first temperature of the environment within a quarter of the time after the most unfavorable temperature test of explosion-proof lamps; _T2 is the quarter after the most unfavorable temperature test of explosion-proof lamps The second temperature of the environment within a period of time; T _g is the last temperature of the environment within a quarter of the time after the most unfavorable temperature test of the explosion-proof lamp; g is the collected ambient temperature within a quarter of the time after the most unfavorable temperature test of the explosion-proof lamp quantity; Step 8. The PIC microcontroller compares the temperature under the most unfavorable conditions of explosion-proof lamps with the data required by the temperature test standard for the most unfavorable conditions of explosion-proof lamps, and judges whether the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; If it is greater than the temperature under the most unfavorable conditions of explosion-proof lamps, the temperature test under the most unfavorable conditions of explosion-proof lamps is qualified; Test failed. 8. The temperature testing method for explosion-proof lamps under the most unfavorable conditions according to claim 7, characterized in that: the PIC single-chip microcomputer controls the movement of the mobile module through the human-computer interaction panel to make the explosion-proof induction lamps in a full-power operating state: Explosion-proof induction lamps are triggered by wireless drive mode. In the low-power operation state of explosion-proof induction lamps, the PIC single-chip microcomputer controls the mobile module to move along the straight line L in the direction of the circle tangent to the explosion-proof induction lamps as the center O of the circle, and finds two symmetrical to the circle center O. Explosion-proof sensor lamp sensing point, and moves back and forth within the range of two endpoints at a certain distance from the two explosion-proof sensor lamp sensing points. 9. The temperature testing method under the most unfavorable conditions for explosion-proof lamps according to claim 7, characterized in that: the specific method for ensuring that the temperature test process of the explosion-proof induction lamps is always under the most unfavorable conditions in the step 2 is: PIC single-chip microcomputer collects full power The voltage and current signals of the operation and temperature test process, and calculate the maximum power and operating power of the explosion-proof induction lamp, and then judge whether the explosion-proof induction lamp is operating under the most unfavorable conditions. The specific judgment method is: Step S1, the PIC microcontroller receives the voltage and current signals collected by the current transformer and voltage transformer when the explosion-proof induction lamp is running at full power, and calculates the full power of the explosion-proof induction lamp, as shown in the following formula: P _max =U _max ×I _max (3) Among them, P _max is the full power of the explosion-proof induction lamp; U _max is the voltage when the explosion-proof induction lamp is running at full power; I _max is the current when the explosion-proof induction lamp is running at full power; Step S2, the PIC microcontroller receives the voltage and current data collected by the current transformer and voltage transformer in real time during the most unfavorable temperature test process of the explosion-proof induction lamp, and then obtains the operating power of the explosion-proof induction lamp. The calculation method is as follows: P=U×I (4) Among them, P is the operating power of explosion-proof induction lamps; U is the operating voltage of explosion-proof induction lamps; I is the operating current of explosion-proof induction lamps; Step S3, the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp is made, as shown in the following formula: ΔP=P _max -P (5) Among them, ΔP is the difference between the full power P _max of the explosion-proof induction lamp and the operating power P of the explosion-proof induction lamp; If ΔP is less than or equal to zero, it is determined that the explosion-proof induction lamp is not operating at full power, and the most unfavorable temperature test for the explosion-proof induction lamp is stopped; if ΔP is greater than zero, it is determined that the explosion-proof induction lamp is operating at full power, and then step S4 is performed. Proceed to the worst-case temperature test for explosion-proof induction luminaires.

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