AU2023270259A1

AU2023270259A1 - Temperature testing system and method for explosion-proof lamp under most unfavorable conditions

Info

Publication number: AU2023270259A1
Application number: AU2023270259A
Authority: AU
Inventors: Jianchao BIAN; Haiying CHANG; Tongzhe LI; Zhifu Li; Zhansong SONG; Shuai WANG; Yanhe Wang; Zhe Wang; Mingying XU; Hongkui ZHANG; Weibin Zhang; Yue Zhang
Original assignee: China Coal Tech & Engineering Group Shenyang Engineering Co; Fushun China Coal Science And Engineering Testing Center Co Ltd; Shandong University
Current assignee: China Coal Technology & Engineering Group Shenyang Engineering Co; Fushun China Coal Science And Engineering Testing Center Co Ltd; Shandong University
Priority date: 2022-08-23
Filing date: 2023-08-23
Publication date: 2024-03-14
Also published as: CN115389045A; WO2024041552A1

Abstract

OF THE DISCLOSURE The present invention provides a temperature testing system and method for an explosion-proof lamp under most unfavorable conditions, and relates to the technical field of temperature testing of an explosion-proof lamp. The system comprises a PIC microcontroller, two thermocouple units, a multi-channel power supply device, a thermal imager, a pressure sensor, a humidity sensor, a voltage transformer, a current transformer, a display screen, a mobile module, a communication unit, an industrial computer, a human-computer interaction panel, and a sound and light warning unit, wherein the PIC microcontroller controls the movement of the mobile module through the human-computer interaction panel to enable the explosion-proof induction lamp to be in the full power operation state, thereby ensuring that the temperature testing process of the explosion-proof induction lamp is always under the most unfavorable conditions; and when current data, voltage data, pressure data and humidity data are within the set value range, the PIC microcontroller receives environment temperature and temperate data of the explosion-proof lamp under most unfavorable conditions, acquired by the two thermocouple units, processes the environment temperature to obtain the temperature data of the explosion-proof lamp under the most unfavorable conditions, and further judges whether temperature testing is qualified. 35

Description

TEMPERATURE TESTING SYSTEM AND METHOD FOR EXPLOSION-PROOF LAMP UNDER MOST UNFAVORABLE CONDITIONS BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001] The present invention relates to the technical field of temperature testing

of an explosion-proof lamp, in particular to a temperature testing system and method

for an explosion-proof lamp under most unfavorable conditions.

2. The Prior Arts

[0002] An explosion-proof lamp refers to illumination lamps such as explosion

insulation tunnel lights, explosion insulation bracket lights, explosion insulation

illumination signal lights, and explosion insulation emergency lights used in explosive

places, which are widely used in flammable and explosive places such as coal mines,

chemical engineering, and places using petroleum. An explosion insulation housing

structure not only prevents the internal electric spark of the explosion-proof lamp from

igniting external explosive gas, but also avoids damage to the explosion-proof lamp by

external environmental explosion, thereby ensuring safe operation of the explosion

proof lamp in explosive places. However, the explosion insulation housing structure

enables internal heat not to release timely, and besides, there is no natural illumination

underground, so that the explosion-proof lamp is in a 24-hour operating state; and

especially in explosive places, the operating environment temperature is high, and in

coal mine underground working faces, the maximum temperature can reach 40 °C, resulting in the temperature of the explosion-proof lamp being much higher than that of ground illumination equipment.

[0003] The national standard GB/T 3836.1-2021 "Explosive Atmospheres -Part 1:

General Requirements for Equipment" clearly stipulates that the surface temperature of

the explosion-proof lamp shall not exceed 150 °C under the most unfavorable

conditions. At present, during the highest surface temperature testing of the explosion

proof lamp, infrared point thermometers are used to test temperature data, and selection

of testing points is not accurate (the explosion-proof lamp has complex structure and

large maximum surface area, and by using the point thermometers, the testing points

can only be selected based on experience). At the same time, testing data needs to be

manually recorded, and whether the testing is completed needs to be manually judged,

resulting in a large workload in the testing process, low accuracy of testing data, and

poor reliability of testing results, thereby bringing accident hazards to the safe operation

of the explosion-proof lamp in the explosive places. In addition, for energy-saving

explosion-proof induction lights, manual triggering of the light emitting side of the

lamp is required to ensure that the temperature testing process is under the most

unfavorable conditions. Completing temperature testing needs several hours (usually

more than 4 hours), thereby increasing the workload of testing personnel, reducing

testing efficiency, and hindering the intelligent development of the inspecting and

testing industry.

SUMMARY OF THE INVENTION

[00041 The technical problem to be solved by the present invention is to provide

a temperature testing system and method for an explosion-proof lamp under most

unfavorable conditions, in response to the shortcomings of the existing technology

mentioned above, to achieve temperature testing for the explosion-proof lamp under

the most unfavorable conditions.

[0005] In order to solve the technical problem,

[0006] the temperature testing system for the explosion-proof lamp under most

unfavorable conditions is characterized by comprising 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, a display screen, a mobile module, a communication unit, an industrial

computer, a human-computer interaction panel, and a sound and light warning unit,

wherein testing ends of the thermocouple unit A and the thermocouple unit B are

respectively placed on the surface of the explosion-proof lamp and in testing

environment; temperature data output ends of the thermocouple unit A and the

thermocouple unit B are electrically connected with a temperature data input end of the

PIC microcontroller; an input end of the multi-channel power supply device is

connected with electric supply, and an output end is electrically connected with power

input terminals of the PIC microcontroller, the display screen, the industrial computer,

the sound and light warning unit, and the explosion-proof lamp; testing ends of the

pressure sensor and the humidity sensor are both placed in the testing environment; a

pressure signal output end of the pressure sensor and a humidity signal output end of the humidity sensor are electrically connected with a pressure signal input end and a humidity signal input end of the PIC microcontroller respectively; a testing end of the voltage transformer is electrically connected with the power input terminal of the explosion-proof lamp, and a voltage signal output end is electrically connected with a voltage signal input end of the PIC microcontroller; a testing end of the current transformer is connected in series with a power supply line of the explosion-proof lamp, and a current signal output end is electrically connected with a current signal input end of the PIC microcontroller; a signal input end of the display screen is electrically connected with a signal output end of the PIC microcontroller; the industrial computer is electrically connected with the PIC microcontroller through the communication unit so as to store data received by the PIC microcontroller; a control signal output end of the human-computer interaction panel is connected with the multi-channel power supply device and the PIC microcontroller; a signal input end of the sound and light warning unit is electrically connected with a warning signal output end of the PIC microcontroller; and an imaging testing end of the thermal imager faces opposite to the surface of an explosion-proof electrical appliance during testing; and the mobile module operates on the front of a glass cover of the explosion-proof lamp.

[00071 Preferably, the thermocouple unit A and the thermocouple unit B each

comprise two thermocouples which are used to test the temperature of the surface of

the explosion-proof lamp and the temperature of the testing environment; the two

thermocouples of the thermocouple unit A are pasted on the surfaces of two testing

points of a housing and the glass cover of the explosion-proof lamp; and the two thermocouples of the thermocouple unit B are placed on two sides of the explosion proof lamp at a distance of 1 meter from a same horizontal plane to test the temperature of the testing environment.

[0008] Preferably, the voltage transformer and the current transformer are both

passive transformers which are used to test the voltage and the current of the explosion

proof lamp;

[0009] preferably, the pressure sensor and the humidity sensor are respectively

used to test the pressure and the humidity of the testing environment;

[0010] preferably, the display screen is used to display the working status of the

system, the temperature of the testing environment, the humidity of the testing

environment, the pressure of the testing environment, and temperature data of the

housing and the glass cover of the explosion-proof lamp; and

[0011] preferably, the human-computer interaction panel is used for starting,

testing, and stopping a power control and testing system, and comprises a power starting

and stopping button of the multi-channel power supply device, a power starting control

button of the PIC microcontroller, a power starting control button of the explosion

proof lamp, a power starting control button of the display screen, a power starting

control button of the industrial computer, a starting, testing and stopping button of the

testing system, and an emergency stop button.

[0012] On the other hand, the present invention also provides a temperature testing

method for an explosion-proof lamp under most unfavorable conditions, comprising the

following steps:

[00131 Step 1: the power supply of the multi-channel power supply device, the

power supply of the PIC microcontroller, the power supply of the display screen, and

the power supply of the industrial computer are started through the human-computer

interaction panel, the power supply line is selected according to the voltage level of the

explosion-proof lamp, and the power supply of the explosion-proof lamp is started;

[0014] Step 2: the PIC microcontroller controls the movement of the mobile

module through the human-computer interaction panel to enable the explosion-proof

induction lamp to be in the full power operation state, thereby ensuring that the

temperature testing process of the explosion-proof induction lamp is always under the

most unfavorable conditions;

[0015] Step 3: the PIC microcontroller receives electrical signals acquired by the

current transformer, the voltage transformer, the pressure sensor, and the humidity

sensor, converts the electrical signals into corresponding current data, voltage data,

pressure data, and humidity data, stops temperature testing under the most unfavorable

conditions of the explosion-proof lamp when any data exceeds the set value, and

prompts system fault on the display screen, the sound and light warning unit performs

sound and light warnings, when the current data, voltage data, pressure data and

humidity data are all within the set value range, Step 4 is performed, and running the

temperature testing on the explosion-proof lamp under the most unfavorable conditions

is continued;

[0016] Step 4: the PIC microcontroller receives the temperature data acquired by

the thermocouple unit A and the thermocouple unit B, and records the temperature testing time of the explosion-proof lamp under the most unfavorable conditions, and when the testing time reaches the set value, prompting is performed on the display screen;

[00171 Step 5: the thermal imager is used to search for the highest temperature

point on the housing and the glass cover of the explosion-proof lamp, and fixes the

thermocouple unit A at the highest temperature point of the housing and the glass cover

of the explosion-proof lamp;

[0018] Step 6: the PIC microcontroller continues to receive n temperature data ti

2 t t, , acquired by the thermocouple unit A, and calculates the difference value

of the temperature data within the period after 1 hour of temperature data acquisition,

so as to judge whether the temperature testing of the explosion-proof lamp has ended

under the most unfavorable conditions, wherein the calculation method is as follows: At = t. 60 -t (1)

[0019] wherein t' is the temperature data acquired by the thermocouple unit A

for themth time, and m is a positive integer between 1 and n-60; t.+60 is the

temperature data acquired by the thermocouple unit A for the (m+ 6 0)th time; Atis

difference value of the temperature data which is acquired by the thermocouple unit A

for the (m+ 6 0)thtime and themth time;

[0020] the PIC microcontroller compares At with 1, if At is greater than or

equal to 1, the PIC microcontroller controls the thermocouple unit A and the

thermocouple unit B to continue to acquire the environment temperature and the

temperature data of the explosion-proof lamp under the most unfavorable conditions, and Step 7 is performed; if At is less than 1, the temperature testing on the explosion t proof lamp under the most unfavorable conditions ends; t is actual temperature of the explosion-proof lamp under the most unfavorable conditions;

[0021] Step 7: the PIC microcontroller receives the environment temperature and

the temperature data of the explosion-proof lamp under the most unfavorable

conditions, acquired by the thermocouple unit A and the thermocouple unit B in real

time, processes the environment temperature to obtain the average temperature within

a quarter of the time after the temperature testing, and converts the temperature to obtain

the temperature data of the explosion-proof lamp under the most unfavorable

conditions, as shown in the following formula:

T + T+---+ T,=t. - 1 +40 g (2)

T

[0022] wherein , is the temperature of the explosion-proof lamp under the most

unfavorable conditions; is the first temperature of the environment within a quarter

of the time after the temperature testing of the explosion-proof lamp under the most

unfavorable conditions; T2 is the second temperature of the environment within a

quarter of the time after the temperature testing of the explosion-proof lamp under the

T most unfavorable conditions; g is the last temperature of the environment within a

most unfavorable conditions; g is the number of environment temperature acquired

within a quarter of the time after the temperature testing of the explosion-proof lamp

under the most unfavorable conditions;

[00231 Step 8: the PIC microcontroller compares the temperature of the explosion

proof lamp under the most unfavorable conditions with data of the explosion-proof

lamp under the most unfavorable conditions, required by a temperature testing standard,

and judges whether the temperature testing of the explosion-proof lamp under the most

unfavorable conditions is qualified; if the data of the explosion-proof lamp under the

most unfavorable conditions, required by the temperature testing standard, is greater

than the temperature of the explosion-proof lamp under the most unfavorable

conditions, the temperature testing of the explosion-proof lamp under the most

unfavorable conditions is qualified; and if the data of the explosion-proof lamp under

the most unfavorable conditions, required by the temperature testing standard, is less

than or equal to the temperature of the explosion-proof lamp under the most unfavorable

conditions, the temperature testing of the explosion-proof lamp under the most

unfavorable conditions is not qualified.

[0024] The PIC microcontroller controls the movement of the mobile module

through the human-computer interaction panel to enable an explosion-proof induction

lamp to be in the full power operation state through the following specific method:

[0025] the explosion-proof induction lamp is triggered in a wireless driving

manner, when the explosion-proof induction lamp is in the low-power operation state,

the PIC microcontroller controls the mobile module to move along a straight line L in

the direction of a tangent of a circle formed by using the explosion-proof induction

lamp as a center 0, two explosion-proof induction light inducing points being

symmetrical with the center 0 are found, and the mobile module moves back and forth within the range of two endpoints at a certain distance from the two explosion-proof induction light inducing points.

[0026] In order to guarantee that the temperature testing process of the explosion

proof induction lamp is under the most unfavorable conditions, the PIC microcontroller

acquires voltage and current signals from the full power operation and temperature

testing process, calculates the maximum power and operating power of the explosion

proof induction lamp, and then judges whether the explosion-proof induction lamp

operates under the most unfavorable conditions, wherein the specific method is as

follows:

[00271 Step SI: the PIC microcontroller receives the voltage and current signals

of the explosion-proof induction lamp in the full power operation state acquired by the

current transformer and the voltage transformer, and calculates the full power of the

explosion-proof induction lamp, wherein the calculation method is as follows:

1Lx =U. xIm (3)

[0028] wherein ax is the full power of the explosion-proof induction lamp;

Umax is voltage of the explosion-proof induction lamp in the full power operation state;

Imax is current of the explosion-proof induction lamp in the full power operation state;

[0029] Step S2: the PIC microcontroller receives voltage data and current data of

the explosion-proof induction lamp under the most unfavorable conditions during the

temperature testing process, acquired by the current transformer and the voltage

transformer, and further obtains the operating power of the explosion-proof induction

lamp, wherein the calculation method is as follows:

P=UxI (4)

[00301 wherein P is the operating power of the explosion-proof induction lamp;

U is operating voltage of the explosion-proof induction lamp; I is operating current

of the explosion-proof induction lamp;

[0031] Step S3, a difference value between the full power "- of the explosion

proof induction lamp and the operating power P of the explosion-proof induction

lamp is obtained, as shown in the following formula:

AP=P . - P (5)

[0032] wherein AP is a difference value between the full power n- of the

explosion-proof induction lamp and the operating power P of the explosion-proof

induction lamp;

[0033] if AP is less than or equal to zero, it is determined that the explosion

proof induction lamp does not operate in the full power condition, and the temperature

testing of the explosion-proof induction lamp under the most unfavorable conditions

ends; and if AP is greater than zero, it is determined that the explosion-proof

induction lamp operates in the full power condition, Step S4 is executed, and the

temperature testing of the explosion-proof induction lamp under the most unfavorable

conditions is continued.

[0034] The beneficial effect of adopting the above technical solution lies in that

the temperature testing system and method for the explosion-proof lamp under the most

unfavorable conditions solve the technical problems of high temperature testing

workload and low testing accuracy of the explosion-proof lamp under the most unfavorable conditions, improve the temperature testing ability and testing level under the most unfavorable conditions, improve testing efficiency, and save power resources, thereby providing testing and verification technical support for the selection of the explosion insulation housing and components in the research and development process of new explosion-proof lamp products, ensuring the quality of explosion-proof lamp products, and promoting continuous and healthy development of the fields of detection and testing and explosion-proof lamps.

BRIEF DESCRIPTION OF DRAWINGS

[0035] Fig. 1 shows a structural block diagram of a temperature testing system for

an explosion-proof lamp under most unfavorable conditions provided by the

embodiment of the present invention;

[0036] Fig.2 shows a flowchart of a temperature testing method for the explosion

proof lamp under most unfavorable conditions provided by the embodiment of the

present invention;

[00371 Fig.3 shows a schematic diagram of a movement trajectory of a mobile

module provided by the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0038] The following will provide a further detailed description of the specific

embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit its scope.

[0039] In the embodiments, the temperature testing system for an explosion-proof

lamp under most unfavorable conditions, as shown in Fig. 1, comprises 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, a display screen, a mobile module, a communication

unit, an industrial computer, a human-computer interaction panel, and a sound and light

warning unit, wherein testing ends of the thermocouple unit A and the thermocouple

unit B are respectively placed on the surface of the explosion-proof lamp and in testing

environment; temperature data output ends of the thermocouple unit A and the

PIC microcontroller; an input end of the multi-channel power supply device is

connected with electric supply through a three-pin plug, and an output end is electrically

connected with power input terminals of the PIC microcontroller, the display screen,

the industrial computer, the sound and light warning unit, and the explosion-proof lamp

so as to supply power for electrical equipment; the pressure sensor and the humidity

sensor are respectively used for testing the pressure and the humidity of the testing

environment; testing ends of the pressure sensor and the humidity sensor are both

placed in the testing environment; a pressure signal output end of the pressure sensor

and a humidity signal output end of the humidity sensor are electrically connected with

a pressure signal input end and a humidity signal input end of the PIC microcontroller respectively; a testing end of the voltage transformer is electrically connected with the power input terminal of the explosion-proof lamp, and a voltage signal output end is electrically connected with a voltage signal input end of the PIC microcontroller; a testing end of the current transformer is connected in series with a power supply line of the explosion-proof lamp, and a current signal output end is electrically connected with a current signal input end of the PIC microcontroller; the voltage transformer and the current transformer are both high-accuracy passive transformers which are used to test the voltage and the current of the explosion-proof lamp; a signal input end of the display screen is electrically connected with a signal output end of the PIC microcontroller so as to display the working status (normal operation, fault and stop) of the system, the temperature of the testing environment, the humidity of the testing environment, the pressure of the testing environment, and temperature data of the housing and the glass cover of the explosion-proof lamp;

[0040] the industrial computer is electrically connected with the PIC

microcontroller through the communication unit so as to store data received by the PIC

microcontroller; a control signal output end of the human-computer interaction panel is

connected with the multi-channel power supply device and the PIC microcontroller; a

signal input end of the sound and light warning unit is electrically connected with a

warning signal output end of the PIC microcontroller; an imaging testing end of the

thermal imager faces opposite to the surface of an explosion-proof electrical appliance

during testing; and the mobile module operates on the front of the glass cover of the explosion-proof lamp under the control of the PIC microcontroller, so as to enable the explosion-proof induction lamp to be in full power operation state.

[0041] The human-computer interaction panel is used for starting, testing, and

stopping a power control and testing system, and comprises a power starting and

stopping button of the multi-channel power supply device, a power starting control

testing system, and an emergency stop button.

[0042] In the embodiments, the thermocouple unit A and the thermocouple unit B

each comprise two thermocouples which are used to test the temperature of the surface

of the explosion-proof lamp and the temperature of the testing environment; the two

points of the housing and the glass cover of the explosion-proof lamp with insulating

tapes; and the two thermocouples of the thermocouple unit B are placed on two sides

of the explosion-proof lamp at a distance of 1 meter from a same horizontal plane to

test the temperature of the testing environment.

[0043] In the embodiments, the temperature testing method for an explosion-proof

lamp under most unfavorable conditions, as shown in Fig.2, comprises the following

steps:

[0044] Step 1: the power supply of the multi-channel power supply device, the

power supply of the PIC microcontroller, the power supply of the display screen, and the power supply of the industrial computer are started through the human-computer interaction panel, the appropriate power supply line is selected according to the voltage level of the explosion-proof lamp, the power supply of the explosion-proof lamp is started;

[0045] Step 2: the PIC microcontroller controls the movement of the mobile

most unfavorable conditions;

[0046] Step 3: the PIC microcontroller receives electrical signals acquired by the

conditions of the explosion-proof lamp when any data exceeds the set value, and

is continued;

[00471 Step 4: the PIC microcontroller receives the temperature data acquired by

the thermocouple unit A and the thermocouple unit B (acquisition is performed once

per minute), and records the temperature testing time of the explosion-proof lamp under the most unfavorable conditions, and when the testing time reaches the set value, prompting is performed on the display screen;

[0048] Step 5: the thermal imager is used by testers to search for the highest

temperature point on the housing and the glass cover of the explosion-proof lamp, and

the thermocouple unit A is fixed at the highest temperature point of the housing and the

glass cover of the explosion-proof lamp with the insulating tapes;

[0049] Step 6: the PIC microcontroller continues to receive n temperature data ti

t2, _ t ,acquired by the thermocouple unit A, to is actual temperature of the

explosion-proof lamp under the most unfavorable conditions, and the difference value

of the temperature data within the period after 1 hour of temperature data acquisition is

calculated, so as to judge whether the temperature testing of the explosion-proof lamp

has ended under the most unfavorable conditions, wherein the calculation method is as

follows: At=t,,160 -- t(

[0050] wherein t. is the temperature data acquired by the thermocouple unit A

for themthtime, and m is a positive integer between 1 and n-60, with the unit of Celsius

degree (°C); t.+60 is the temperature data acquired by the thermocouple unit A for the

(m+ 6 0)th time, with the unit of Celsius degree (°C); At is a difference value of the

temperature data which is acquired between the (m+ 6 0)th time and themth time by the

thermocouple unit A, with the unit of Celsius degree (°C);

[0051] the PIC microcontroller compares At with 1, if At is greater than or

equal to 1, the PIC microcontroller controls the thermocouple unit A and the thermocouple unit B to continue to acquire the environment temperature and the temperature data of the explosion-proof lamp under the most unfavorable conditions, and Step 7 is performed; and if At is less than 1, the temperature testing on the explosion-proof lamp under the most unfavorable conditions ends.

[0052] Step 7: the PIC microcontroller receives the environment temperature and

the temperature data of the explosion-proof lamp under the most unfavorable

time, processes the environment temperature to obtain the average temperature (the

temperature data within a quarter of the time after the temperature testing is , T2,

T ...... , within ,) a quarter of the time after the temperature testing, and converts the

temperature to obtain the temperature data of the explosion-proof lamp under the most

unfavorable conditions (+ 40 °C), as shown in the following formula:

T +T+--+T T,=-t. - 1 +40 g (2)

T

[0053] wherein , is the temperature of the explosion-proof lamp under the most

unfavorable conditions, with the unit of Celsius degree (°C); is the first temperature

of the environment within a quarter of the time after the temperature testing of the

explosion-proof lamp under the most unfavorable conditions, with the unit of Celsius

degree (°C); 2 is the second temperature of the environment within a quarter of the

time after the temperature testing of the explosion-proof lamp under the most

T unfavorable conditions, with the unit of Celsius degree (°C); g is the last temperature

explosion-proof lamp under the most unfavorable conditions, with the unit of Celsius degree (°C); g is the number of environment temperature acquired within a quarter of the time after the temperature testing of the explosion-proof lamp under the most unfavorable conditions, without dimension;

[0054] Step 8: the PIC microcontroller compares the temperature of the explosion

than the temperature of the explosion-proof lamp under the most unfavorable

conditions, the temperature testing of the explosion-proof lamp under the most

unfavorable conditions is not qualified.

[0055] The explosion-proof induction lamp belongs to an energy-saving special

explosion-proof lamp. The explosion-proof induction lamp operates in two power

consumption ranges. Before induction, the explosion-proof induction lamp operates in

low-power and energy-saving mode, and after induction, the explosion-proof induction

lamp operates in full power mode. Under the most unfavorable conditions, temperature

testing should be performed during the maximum power stage. Therefore, it is necessary to trigger the induction function of the explosion-proof induction lamp in real time, and calculate the power of the explosion-proof induction lamp based on voltage and current, thereby ensuring that the explosion-proof induction lamp operates under the most unfavorable conditions.

[0056] In the embodiment, the PIC microcontroller controls the movement of the

mobile module through the human-computer interaction panel to enable the explosion

proof induction lamp to be in the full power operation state through the following

specific method:

[00571 the explosion-proof induction lamp is triggered in a wireless driving

manner, and the PIC microcontroller controls the mobile module to move through the

human-computer interaction panel to guarantee the explosion-proof induction lamp to

be in the full power operation state; when the explosion-proof induction lamp is in the

low-power operation state, the PIC microcontroller controls the mobile module to move

along a straight line L in the direction of a tangent of a circle formed by using the

explosion-proof induction lamp as a center 0 (if the mobile module is extremely near

the explosion-proof induction lamp, the temperature testing results are affected, if the

mobile module is extremely far away from the explosion-proof induction lamp, it is not

guaranteed that the explosion-proof induction lamp is always in full power operation

state, so that after comprehensively considering the effect on the temperature testing

results of the explosion-proof induction lamp and guaranteeing that the explosion-proof

induction lamp is always in the full power operation state, the vertical distance of L to

the explosion-proof induction lamp is 2 m), two explosion-proof induction light inducing points symmetrical with the center 0 are found, and the mobile module moves back and forth within the range of two endpoints at a certain distance from the two explosion-proof induction light inducing points.

[00581 In the embodiments, a determination method for two explosion-proof

induction light inducing points and the two endpoints, as shown in Fig. 3, specially

comprises:

[0059] the mobile module moves on the straight line L, and when the mobile

module reaches a point A on the straight line L, the explosion-proof induction light

switches from the low power consumption state to the full power operation state, and

the point A is the explosion-proof induction light inducing point; and in the same

method, an explosion-proof induction light inducing point D on the other side of the

straight line L corresponding to the point A is found(opposite to the direction of the

same line as the point A and the center of the circle). The operating trajectory points B

and C of the mobile module are marked on the straight line L, wherein BO=0.6AO and

CO=0.6DO, then B and C are the two endpoints of the operating trajectory of the mobile

module, and the mobile module moves back and forth between B and C.

[00601 In the embodiments, in order to guarantee that the temperature testing

process of the explosion-proof induction lamp is under the most unfavorable conditions,

the PIC microcontroller acquires voltage and current signals from the full power

operation and temperature testing process, calculates the maximum power and

operating power of the explosion-proof induction lamp, and then judges whether the explosion-proof induction lamp operates under the most unfavorable conditions, wherein the specific method is as follows:

[0061] Step SI: the PIC microcontroller receives the voltage and current signals

explosion-proof induction lamp, wherein the calculation method is as follows:

1Lx =U. xIm (3)

[0062] wherein - is the full power of the explosion-proof induction lamp,

with the unit of Watt (w); Umax is voltage during the full power operation of the

explosion-proof induction lamp, with the unit of volt (V); and Imax is current during

the full power operation of the explosion-proof induction lamp, with the unit of ampere

(A). In the embodiments, the voltage and the current of the explosion-proof induction

lamp in the full power operation state are obtained by taking the average of multiple

measurements of the voltage and the current. Generally, the voltage data and current

data of the explosion-proof induction lamp during full power operation are measured 5

times.

[0063] Step S2: the PIC microcontroller receives voltage data and current data of

lamp, wherein the calculation method is as follows: P=UxI (4)

[00641 wherein P is the operating power of the explosion-proof induction lamp,

with the unit of Watt (w); U is operating voltage of the explosion-proof induction

lamp, with the unit of volt (V); I is operating current of the explosion-proof induction

lamp, with the unit of ampere (A);

[0065] Step S3, a difference value between the full power "- of the explosion

proof induction lamp and the operating power P of the explosion-proof induction

lamp is obtained, as shown in the following formula:

AP=J. -P (5)

[0066] wherein AP is a difference value between the full power na of the

explosion-proof induction lamp and the operating power P of the explosion-proof

induction lamp, with the unit of Watt (w);

[00671 if AP is less than or equal to zero, it is determined that the explosion

ends; and if AP is greater than zero, it is determined that the explosion-proof

conditions is continued.

[0068] Finally, it should be noted that the embodiments are only used 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 aforementioned

embodiments, ordinary skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope limited by the claims of the present invention.

Claims

WHAT IS CLAIMED IS:

1 A temperature testing system for an explosion-proof lamp under most unfavorable

conditions, characterized by comprising 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, a display screen, a mobile module, a communication unit, an

industrial computer, a human-computer interaction panel, and a sound and light

warning unit, wherein testing ends of the thermocouple unit A and the

thermocouple unit B are respectively placed on the surface of the explosion-proof

lamp and in testing environment; temperature data output ends of the

thermocouple unit A and the thermocouple unit B are electrically connected with

a temperature data input end of the PIC microcontroller; an input end of the multi

channel power supply device is connected with electric supply, and an output end

is electrically connected with power input terminals of the PIC microcontroller,

the display screen, the industrial computer, the sound and light warning unit, and

the explosion-proof lamp; testing ends of the pressure sensor and the humidity

sensor are both placed in the testing environment; a pressure signal output end of

the pressure sensor and a humidity signal output end of the humidity sensor are

electrically connected with a pressure signal input end and a humidity signal input

end of the PIC microcontroller respectively; a testing end of the voltage

transformer is electrically connected with the power input terminal of the

explosion-proof lamp, and a voltage signal output end is electrically connected with a voltage signal input end of the PIC microcontroller; a testing end of the current transformer is connected in series with a power supply line of the explosion-proof lamp, and a current signal output end is electrically connected with a current signal input end of the PIC microcontroller; a signal input end of the display screen is electrically connected with a signal output end of the PIC microcontroller; the industrial computer is electrically connected with the PIC microcontroller through the communication unit so as to store data received by the

PIC microcontroller; a control signal output end of the human-computer

interaction panel is connected with the multi-channel power supply device and the

PIC microcontroller; a signal input end of the sound and light warning unit is

electrically connected with a warning signal output end of the PIC microcontroller;

an imaging testing end of the thermal imager faces opposite to the surface of an

explosion-proof electrical appliance during testing; and the mobile module

operates on the front of a glass cover of the explosion-proof lamp.
2 The temperature testing system for an explosion-proof lamp under most

unfavorable conditions according to claim 1, characterized in that the

thermocouple unit A and the thermocouple unit B each comprise two

thermocouples which are used to test the temperature of the surface of the

explosion-proof lamp and the temperature of the testing environment; the two

thermocouples of the thermocouple unit Aare pasted on the surfaces of two testing

points of a housing and the glass cover of the explosion-proof lamp; and the two

thermocouples of the thermocouple unit B are placed on two sides of the explosion-proof lamp at a distance of 1 meter from a same horizontal plane to test the temperature of the environment.
3 The temperature testing system for an explosion-proof lamp under most

unfavorable conditions according to claim 1, characterized in that the voltage

transformer and the current transformer are both passive transformers which are

used to test the voltage and the current of the explosion-proof lamp.
4 The temperature testing system for an explosion-proof lamp under 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 the

humidity of the environment.

The temperature testing system for an explosion-proof lamp under most

unfavorable conditions according to claim 1, characterized in that the display

screen is used to display the working status of the system, the temperature of the

testing environment, the humidity of the testing environment, the pressure of the

testing environment, and temperature data of the housing and the glass cover of

the explosion-proof lamp.

6 The temperature testing system for an explosion-proof lamp under most

unfavorable conditions according to claim 1, characterized in that the human

computer interaction panel is used for starting, testing, and stopping a power

control and testing system, and comprises a power starting and stopping button of

the multi-channel power supply device, a power starting control button of the PIC

microcontroller, a power starting control button of the explosion-proof lamp, a power starting control button of the display screen, a power starting control button of the industrial computer, a starting, testing and stopping button of the testing system, and an emergency stop button.

7 A temperature testing method for an explosion-proof lamp under most unfavorable

conditions, based on the temperature testing system according to claim 1,

comprising the following steps:

Step 1: the power supply of the multi-channel power supply device, the power

supply of the PIC microcontroller, the power supply of the display screen, and the

power supply of the industrial computer are started through the human-computer

interaction panel, the power supply line is selected according to the voltage level

of the explosion-proof lamp, and the power supply of the explosion-proof lamp is

started;

Step 2: the PIC microcontroller controls the movement of the mobile module

through the human-computer interaction panel to enable the explosion-proof

induction lamp to be in the full power operation state, thereby ensuring that the

temperature testing process of the explosion-proof induction lamp is always under

the most unfavorable conditions;

Step 3: the PIC microcontroller receives electrical signals acquired by the current

transformer, the voltage transformer, the pressure sensor, and the humidity sensor,

converts the electrical signals into corresponding current data, voltage data,

pressure data, and humidity data, stops temperature testing under the most

unfavorable conditions of the explosion-proof lamp when any data exceeds the set value, and prompts system fault on the display screen, the sound and light warning unit performs sound and light warnings, when the current data, voltage data, pressure data and humidity data are all within the set value range, Step 4 is performed, and running the temperature testing on the explosion-proof lamp under the most unfavorable conditions is continued;

Step 4: the PIC microcontroller receives the temperature data acquired by the

thermocouple unit A and the thermocouple unit B, and records the temperature

testing time of the explosion-proof lamp under the most unfavorable conditions,

and when the testing time reaches the set value, prompting is performed on the

display screen;

Step 5: the thermal imager is used to search for the highest temperature point on

the housing and the glass cover of the explosion-proof lamp, and fixes the

thermocouple unit A at the highest temperature point of the housing and the glass

cover of the explosion-proof lamp;

Step 6: the PIC microcontroller continues to receive n temperature data t t2

...... ,I ti, acquired by the thermocouple unit A, and calculates the difference value

of the temperature data within the period after 1 hour of temperature data

acquisition, so as to judge whether the temperature testing of the explosion-proof

lamp has ended under the most unfavorable conditions, wherein the calculation

method is as follows:

At= t,, 6 0 -- t,, wherein t. is the temperature data acquired by the thermocouple unit A for the mth time, and m is a positive integer between 1 and n-60; ".-60 is the temperature data acquired by the thermocouple unit A for the (m+ 6 0)th time; Atis difference value of the temperature data which is acquired by the thermocouple unit A for the

(m+ 6 0)th time and the mth time;

the PIC microcontroller compares At with 1, if At is greater than or equal to 1,

the PIC microcontroller controls the thermocouple unit A and the thermocouple

unit B to continue to acquire environment temperature and the temperature data of

the explosion-proof lamp under the most unfavorable conditions, and Step 7 is

performed; if At is less than 1, the temperature testing on the explosion-proof

lamp under the most unfavorable conditions ends; t, is actual temperature of the

explosion-proof lamp under the most unfavorable conditions;

Step 7: the PIC microcontroller receives the environment temperature and the

temperature data of the explosion-proof lamp under the most unfavorable

conditions, acquired by the thermocouple unit A and the thermocouple unit B in

real time, processes the environment temperature to obtain the average

temperature within a quarter of the time after the temperature testing, and converts

the temperature to obtain the temperature data of the explosion-proof lamp under

the most unfavorable conditions, as shown in the following formula: T +T +--+T T,=-t. - 1 2 +40 g (2)

T wherein ,, is the temperature of the explosion-proof lamp under the most

unfavorable conditions; is the first temperature of the environment within a quarter of the time after the temperature testing of the explosion-proof lamp under the most unfavorable conditions; is the second temperature of the environment within a quarter of the time after the temperature testing of the explosion-proof lamp under the most unfavorable conditions; 7 is the last temperature of the environment within a quarter of the time after the temperature testing of the explosion-proof lamp under the most unfavorable conditions; g is the number of environment temperature acquired within a quarter of the time after the temperature testing of the explosion-proof lamp under the most unfavorable conditions;

Step 8: the PIC microcontroller compares the temperature of the explosion-proof

lamp under the most unfavorable conditions with data of the explosion-proof lamp

under the most unfavorable conditions, required by a temperature testing standard,

and judges whether the temperature testing of the explosion-proof lamp under the

most unfavorable conditions is qualified; if the data of the explosion-proof lamp

under the most unfavorable conditions, required by the temperature testing

standard, is greater than the temperature of the explosion-proof lamp under the

most unfavorable conditions, the temperature testing of the explosion-proof lamp

under the most unfavorable conditions is qualified; and if the data of the explosion

proof lamp under the most unfavorable conditions, required by the temperature

testing standard, is less than or equal to the temperature of the explosion-proof

lamp under the most unfavorable conditions, the temperature testing of the

explosion-proof lamp under the most unfavorable conditions is not qualified.

8 The temperature testing method for an explosion-proof lamp under most

unfavorable conditions according to claim 7, characterized in that the PIC

microcontroller controls the movement of the mobile module through the human

computer interaction panel to enable an explosion-proof induction lamp to be in

the full power operation state through the following specific method:

the explosion-proof induction lamp is triggered in a wireless driving manner, when

the explosion-proof induction lamp is in the low-power operation state, the PIC

microcontroller controls the mobile module to move along a straight line L in the

direction of a tangent of a circle formed by using the explosion-proof induction

lamp as a center 0, two explosion-proof induction light inducing points being

symmetrical with the center 0 are found, and the mobile module moves back and

forth within the range of two endpoints at a certain distance from the two

explosion-proof induction light inducing points.

9 The temperature testing method for an explosion-proof lamp under most

unfavorable conditions according to claim 7, characterized in that the specific

method for ensuring that the temperature testing process of the explosion-proof

induction lamp is always under the most unfavorable conditions in step 2 is as

follows: the PIC microcontroller acquires voltage and current signals from the full

power operation and temperature testing process, calculates the maximum power

and operating power of the explosion-proof induction lamp, and then judges

whether the explosion-proof induction lamp operates under the most unfavorable

conditions, wherein the specific judgment method is as follows:

Step SI: the PIC microcontroller receives the voltage and current signals of the

explosion-proof induction lamp in the full power operation state acquired by the

current transformer and the voltage transformer, and calculates the full power of

the explosion-proof induction lamp, as shown in the following formula:

ax =U. xIm (3)

wherein ax is the full power of the explosion-proof induction lamp; Uax is

voltage of the explosion-proof induction lamp in the full power operation state;

Imax is current of the explosion-proof induction lamp in the full power operation

state;

Step S2: the PIC microcontroller receives voltage data and current data of the

explosion-proof induction lamp under the most unfavorable conditions during the

temperature testing process, acquired by the current transformer and the voltage

transformer, and further obtains the operating power of the explosion-proof

induction lamp, wherein the calculation method is as follows: P=UxI (4)

wherein P is the operating power of the explosion-proof induction lamp; U is

operating voltage of the explosion-proof induction lamp; I is operating current

of the explosion-proof induction lamp;

Step S3, a difference value between the full power -ax of the explosion-proof

induction lamp and the operating power P of the explosion-proof induction lamp

is obtained, as shown in the following formula:

AP=J -3 (5) wherein AP is a difference value between the full power "- of the explosion proof induction lamp and the operating power P of the explosion-proof induction lamp; if AP is less than or equal to zero, it is determined that the explosion-proof induction lamp does not operate in the full power condition, and the temperature testing of the explosion-proof induction lamp under the most unfavorable conditions ends; and if AP is greater than zero, it is determined that the explosion-proof induction lamp operates in the full power condition, Step S4 is executed, and the temperature testing of the explosion-proof induction lamp under the most unfavorable conditions is continued.