CN219348210U - Airbag thermal fatigue detection device for positive pressure oxygen respirator - Google Patents

Abstract

The utility model relates to the technical field of coal mine respiratory protection safety, and discloses an air bag thermal fatigue detection device for a positive pressure oxygen respirator, which comprises a controller, an electric heating water tank, a first temperature sensor, an inflator pump, an air pump, an electric valve, a second temperature sensor, a differential pressure sensor, a pressure relief valve, a detection gas circuit, an air bag and an alarm. The controller downwards controls the air pump to inflate, the heating water tank to heat and the air pump to exhaust air, so as to provide a stable and controllable hot air source for the test platform; meanwhile, real-time data such as air pressure, temperature and the like in the air bag are detected by the sensor, and the set test pressure of the air bag is maintained by controlling the opening of the electric valve and matching with the air release valve; and providing real-time data for human-machine interaction upwards, and receiving control and operation instructions. According to the scheme, the real working environment of the air bag can be simulated, automatic acquisition of detection data is realized, so that the quality of the air bag heat sealing process is effectively and quickly judged, the detection efficiency can be improved, and the detection cost is reduced.

Description

Airbag Thermal Fatigue Detection Device for Positive Pressure Oxygen Breathing Apparatus

technical field

The utility model relates to the technical field of respiratory protection safety in coal mines, in particular to an airbag thermal fatigue detection device for a positive pressure oxygen respirator.

Background technique

Positive pressure oxygen respirator is an essential personal respiratory protective equipment for coal mine rescue personnel to engage in rescue work in the harsh environment of toxic and harmful gases or hypoxia. The airbag for positive pressure oxygen respirator uses the softness of TPU material to make the volume of the airbag change with the pressure of breathing gas, so as to realize the gas storage function in the breathing cycle circuit of positive pressure oxygen respirator. The finished airbag is made of TPU material panels and TPU injection molding joints connecting the clean tank, cooling box, self-replenishing valve, water release valve and positive pressure plate through a high-frequency high-frequency heat-sealing process to produce a finished airbag. Since the airbags for positive pressure oxygen respirators work in the environment of high temperature gas and certain gas pressure for a long time, there are quality problems such as openings in heat-sealing parts and joint cracks in the finished airbags, which will seriously affect the breathing of users of positive pressure oxygen respirators. Safety.

At present, manufacturers of positive pressure oxygen respirators use finished airbags to be assembled into the complete respirator product for performance testing of the whole machine. The cost of machine testing is high and the testing efficiency is low. The quality department does not have a special device for airbag thermal fatigue testing, and cannot effectively judge the quality of the airbag heat sealing process, so as to ensure the safety and reliability of the airbag and positive pressure oxygen respirator when used together.

Utility model content

The purpose of this utility model is to provide an airbag thermal fatigue detection device for positive pressure oxygen respirator, which can simulate the real working environment of the airbag and realize the automatic collection of detection data, so as to realize effective and rapid judgment on the quality of the heat sealing process of the airbag, thereby ensuring The air bag is safe and reliable when used in conjunction with the positive pressure oxygen respirator, and the detection efficiency is improved and the detection cost is reduced.

In order to achieve the above purpose, the technical solution of the present utility model provides an airbag thermal fatigue detection device for a positive pressure oxygen respirator, including a controller, a hot gas source supply device and a thermal fatigue detection test bench;

The hot air source supply device includes an electric heating water tank, a first temperature sensor, an air pump, an air suction pump, and an electric valve; a heating module is arranged in the electric heating water tank; the temperature sensor is arranged in the electric heating water tank;

The air inlet of the air pump is connected with the indoor air, the air outlet of the air pump is connected with the air inlet pipe of the electric heating water tank, and the air outlet pipe of the electric heating water tank is connected with the air inlet of the air pump; the air outlet of the air pump is connected with the air inlet of the air pump. The air inlet connection of the electric valve;

The thermal fatigue detection test bench includes a second temperature sensor, a differential pressure sensor, a pressure relief valve, a detection air circuit, an air bag, and an alarm; the air inlet of the detection air circuit is connected to the air outlet of the electric valve; the detection The detection connection port of the gas circuit is threadedly connected to the air bag casing nut fixedly connected to the air bag; the detection end of the second temperature sensor is connected to the upper end of the detection gas circuit through threads, and the detection port of the differential pressure sensor communicates with the pressure sampling port of the air bag; The gas outlet of the detection gas circuit is connected to a pressure relief valve;

The controller is electrically connected with the heating module, the first temperature sensor, the air pump, the air pump, the electric valve, the second temperature sensor, the differential pressure sensor and the alarm respectively.

The principle and effect of this scheme are: in this scheme, the controller is used to control the heating module to heat the water in the electric heating water tank, and the controller is used to detect the temperature of the water in the electric heating water tank through the first temperature sensor, The controller is used to inflate the electric heating water tank by controlling the air pump, and the controller is used to control the start of the air pump when the first temperature sensor detects that the water in the electric heating water tank reaches a preset value, so as to realize the air heating in the electric heating water tank. The hot air is extracted, and the corresponding hot air passes through the air pump, the detection air circuit, and the air bag in sequence, so as to realize the hot air filling of the air bag. In this way, a stable hot air source can be provided for the air bag.

With the filling process, the pressure in the airbag is getting higher and higher, and the controller is used to detect the temperature and pressure in the airbag through the second temperature sensor and differential pressure sensor. When the corresponding pressure obtains the preset test pressure, The controller is used to maintain the pressure by controlling the opening of the electric valve, and the pressure relief valve exhausts according to the set pressure, so that the airbag maintains this pressure range for a certain period of time, and records the opening of the electric valve at this time , pressure value range, and then continue to detect whether the air pressure exceeds the recorded pressure value range within the set detection time. If the air pressure drops and exceeds the preset pressure value range of the detection pressure, it is determined that there is a partial rupture or opening at the heat sealing part of the airbag. If the quality is unqualified, the inspection process will be terminated ahead of time, the electric heating water tank, air pump and air pump will be turned off, and the inflation of the airbag will be stopped. Alarm to prompt quality inspectors to check unqualified airbags.

In the prior art, when the airbag is tested, the finished airbag is generally assembled into the complete respirator product to perform the performance test of the whole machine. The whole machine test cycle is long, the cost is high, and the test efficiency is low.

In this scheme, the real working environment of the airbag is simulated by the thermal fatigue detection device, and the pressure and temperature parameters are set and adjusted by the controller to provide a stable and controllable hot gas source for the airbag detection, so as to realize the process quality of the airbag quickly and effectively. Inspection to reduce the reject rate of airbags, thereby improving the safety and reliability of airbags and positive pressure oxygen respirators when used together, and ultimately ensuring the breathing safety of respirator users, and achieving the purpose of improving detection efficiency and reducing detection costs.

Through the setting of the alarm, when it is judged that the corresponding airbag is unqualified, the quality inspection personnel will be notified at the first time to check the unqualified airbag, and the heat-sealing process parameters can be adjusted in time according to the test results to avoid a large number of unqualified during production. Finished airbag.

Further, the heating module includes a plurality of heating tubes, each of which is controlled by a controller.

Beneficial effects: the output of the heating tube is controlled by the controller, which can ensure the long-term use of the heating tube and greatly increase the service life of the heating tube.

Further, the electric heating water tank is also provided with a water inlet valve and a water level sensor electrically connected to the controller; the water inlet valve is arranged at the water inlet end of the outer tank wall of the electric heating water tank; the water level sensor is arranged at the electric heating water tank. Heating on the inside wall of the tank.

Beneficial effects: the controller is used to detect the water level in the electric heating water tank through the water level sensor. The system sets a high water level threshold and a low water level threshold. When the water level sensor detects that the electric heating water tank is at a low water level, the controller will start the alarm Make an alarm and control the water inlet valve to open at the same time, so as to realize the automatic replenishment of water in the electric heating water tank. When the water level sensor detects that the water in the electric heating water tank is at a high water level, control the water inlet valve to close and stop adding water.

The automatic adjustment of the water level in the electric heating water tank is realized through the cooperation between the water level sensor and the water inlet valve. High degree of automation, effectively saving manpower.

Further, the alarm includes a buzzer and a warning light.

Beneficial effects: double prompts are provided through the sound and the light tube to ensure that quality inspectors can obtain alarm reminders.

Further, an air-water separation device is installed between the air inlet of the air pump and the outlet pipe of the electric heating water tank.

Beneficial effects: the water vapor in the hot air source can be separated through the arrangement of the air-water separation device, so as to avoid water accumulation in the air bag during the detection process, thereby causing inaccurate detection results of the air bag.

Further, the electric heating water tank includes a water tank shell and a water tank liner; the bottom of the water tank liner is provided with an installation card slot for placing the heating pipe, and a partition is also arranged on the installation card slot; the water tank shell Universal fixed casters are provided on the four corners of the bottom.

Beneficial effects: In this scheme, the electric heating water tank includes the water tank shell and the water tank liner. Through this double-layer setting, the heat preservation effect and heat insulation effect of the water tank are better, and the heating tube is installed at the bottom of the water tank liner The trough is used to isolate multiple heating tubes through a partition, which provides a more stable and safe working environment for the heating tubes.

Further, the thermal fatigue detection test bench also includes a detection platform, the detection gas path is installed on the detection platform through a fixed support seat, and a plurality of detection connection ports for installing and connecting airbags are arranged on the detection gas path. The road was wrapped in insulation cotton.

Beneficial effects: In this solution, the detection gas path has multiple detection connection ports, so that multiple airbags can be installed at the same time to form an airbag group, which greatly improves the efficiency of airbag detection. And the detection gas path is wrapped with thermal insulation cotton, which can ensure the thermal insulation effect of the transported gas.

Description of drawings

Fig. 1 is a logic block diagram of an airbag thermal fatigue detection device for a positive pressure oxygen respirator in Embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the airbag thermal fatigue detection device for the positive pressure oxygen respirator in Embodiment 1 of the present utility model.

Detailed ways

The following is further described in detail through specific implementation methods:

The symbols in the drawings of the description include: industrial computer and human-computer interaction system 1, hot air supply device 2, thermal fatigue detection test bench 3, human-computer interaction device 11, industrial computer 12, controller 13, AC contactor 14, Surge suppressor 15, relay 16, alarm 17, multi-channel data recorder 18, console 19, electric heating water tank 21, circulating water pump 22, first temperature sensor 23, water level sensor 24, heating pipe 25, partition 26 , universal fixed casters 27, water discharge valve 28, air inlet pipe 29, air pump 210, air inlet 211, air outlet pipe 212, air-water separation device 213, air pump 214, electric valve 215, water inlet valve 216, detection air circuit 31. Detection table 32, pressure relief valve 33, fixed support seat 34, air bag 35, detection connection port 36, second temperature sensor 37, differential pressure sensor 38.

Embodiment one:

Embodiment 1 is basically shown in Figure 1 and Figure 2: a thermal fatigue detection device for airbags for positive pressure oxygen respirators, including a controller 13, a hot gas source supply device 2 and a thermal fatigue detection test bench 3;

The hot air supply device 2 includes an electric heating water tank 21, a circulating water pump 22, a first temperature sensor 23, an air pump 210, an air pump 214, and an electric valve 215; a heating module is arranged in the electric heating water tank 21; the first temperature sensor 23 is set in the electric heating water tank 21; in this embodiment, the heating module includes a plurality of heating tubes 25, wherein the heating tubes 25 adopt 304 seamless heating tubes, and the heating tubes are controlled by the controller. In another embodiment, the heating module includes a plurality of heating tubes 25 and a relay 16 , and the heating tubes are controlled by the relay 16 .

The air inlet 211 of the air pump 210 is connected with the indoor air, and the air outlet of the air pump 210 is connected with the air inlet pipe 29 of the electric heating water tank 21 to realize the inflation function; The air outlet of the gas-water separation device 213 is connected with the air inlet of the air pump 214, and the air outlet of the air pump 214 is connected with the air inlet of the electric valve 215.

The thermal fatigue detection test bench 3 includes a fixed support base 34, a detection platform 32, a second temperature sensor 37, a differential pressure sensor 38, a pressure relief valve 33, a detection gas circuit 31, an air bag 35, and an alarm 17; the detection gas circuit 31 passes through the fixed The support base 34 is installed on the detection platform 32 . The detection gas path 31 is provided with a plurality of detection connection ports 36 for installing and connecting the airbags 35. The detection gas path 31 is wrapped with thermal insulation cotton, and the temperature of the charged gas is guaranteed by the thermal insulation cotton. In this embodiment, three detection connection ports 36 are provided on the detection gas path 31, so that the detection gas path 31 is divided into three branches, which are respectively the first detection branch, the second detection branch, and the third detection branch; The detection connection port 36 on a branch is threadedly connected with the air bag casing nut fixedly connected on the air bag. The second temperature sensor 37 is fastened on the upper end of the detection gas path 31 by threads, and the differential pressure sensor 38 is fixed on the side of the detection platform 32 by bolts, and the detection port of the differential pressure sensor 38 communicates with the pressure sampling port of the air bag 35 . A corresponding relief valve 33 is provided at the end of each branch. In this embodiment, the gas path flows through the air pump 210 , the electric heating water tank 21 , the air pump 214 , the detection gas path 31 , the air bag 35 and the pressure relief valve 33 in sequence. In this embodiment, a corresponding differential pressure sensor 38 , an air bag 35 and a pressure relief valve 33 are arranged on each branch, and the second temperature sensor 37 is arranged on the detection air path 31 . Simultaneously in this embodiment, the air bag 35 that is arranged on each branch road is provided with a plurality of, in concrete present embodiment, the number of the air bag 35 on each branch road is 4, connects in series between the air bag 35 and the air bag , the last air bag 35 communicates with the pressure relief valve 33 on the corresponding branch. The thermal fatigue detection of twelve airbags 35 is realized synchronously, and the detection efficiency is greatly improved.

In order to monitor the water level in the electric heating water tank 21, avoid that the water level in the electric heating water tank 21 gradually decreases along with heating, and prevent the electric heating water tank 21 and the dividing plate 26 from dry burning. The electric heating water tank is also provided with a water inlet valve 216 electrically connected to the controller 13, a water level sensor 24, and an alarm 17. The water inlet valve 216 is arranged on the water inlet end of the outer tank wall of the electric heating water tank 21, and is connected with the external water supply. Pipeline connection; the water level sensor 24 is arranged on the inner side wall of the electric heating water tank 21 . In this embodiment, the alarm 17 includes a buzzer and a warning light. In order to facilitate the maintenance of the electric heating water tank 21, a drain valve 28 is also provided on the side wall of the electric heating water tank 21.

The controller 13 is electrically connected to the heating module, the first temperature sensor 23 , the water inlet valve 216 , the air pump 210 , the air pump 214 , the electric valve 215 , the second temperature sensor 37 , the differential pressure sensor 38 and the alarm 17 .

The controller 13 is used to heat the water in the electric heating water tank 21 through the heating module, and detect the temperature of the water in the electric heating water tank 21 through the first temperature sensor 23, so as to control the air pump 210 to flow into the electric heating water tank 21 Inflate, when the first temperature sensor 23 detects that the water temperature in the electric heating water tank 21 reaches the preset water temperature value, the air pump 214 is controlled to start to realize the extraction of hot air in the electric heating water tank 21, and the extracted hot air passes through the electric valve 215 in turn , Detect the gas circuit 31 and the air bag 35, and start and stop the heating module of the electric heating water tank 21 intermittently to realize the temperature of the heating gas, realize the hot gas filling of the air bag 35, and provide a stable source of hot gas for the air bag 35.

Along with the continuous filling of hot gas, the pressure in the air bag 35 is getting bigger and bigger, and the controller 13 is used to detect the temperature and the pressure in the air bag 35 through the second temperature sensor 37 and the differential pressure sensor 38, and the air pump 214 is constantly When the gas is drawn to the airbag 35, when the corresponding pressure reaches the preset pressure value, the controller 13 is used to control the opening of the electric valve 215, and the pressure relief valve 33 is opened according to the set pressure, so that the airbag will be released within a period of time. The fluctuation of the pressure value in 35 is maintained within the range of the preset pressure value, and at this time, the controller 13 will record the opening degree of the electric valve 215 and the pressure value range. Then continue to detect whether the air pressure value exceeds the preset pressure value range within the set detection time. If the air pressure drops and exceeds the preset pressure value range of the detection pressure, it is determined that there are local ruptures, openings, etc. in the heat sealing part of the airbag 35. Unqualified, end the detection process in advance, turn off the electric heating water tank 21, air pump 210 and air pump 214, stop inflating the air bag 35, and send an alarm by the alarm 17, prompting the quality inspector to check the unqualified air bag 35. In this embodiment, the alarm 17 includes a buzzer and a warning light, and the warning light is a red LED light. Double reminders are given by sound and light tubes to ensure that quality inspectors can obtain alarm reminders, make timely judgments, and deal with unqualified airbags 35 .

In order to monitor the water level in the electric heating water tank 21, avoid the water level in the electric heating water tank 21 gradually decreasing with the continuous heating, which will not only cause the heating tube 25 to overheat the partition plate 26, but also be unfavorable for electric heating The use of the water tank 21, the controller 13 is used to detect the water level in the electric heating water tank 21 through the water level sensor 24, the system sets a high water level threshold and a low water level threshold, when the water level sensor 24 detects that the electric heating water tank 21 is at a low water level Control the opening of the water inlet valve 216. In this embodiment, when it is detected that the electric heating water tank 21 is at a low water level, at the same time, the controller 13 will start the alarm 17 to alarm, that is, the corresponding alarm 17 in this embodiment Multiple alarms can be realized. The first is an alarm for the failure of the air bag 35, and the second is an alarm for the low water level of the electric heating water tank 21, thereby realizing automatic addition of water in the electric heating water tank 21. When the water level sensor 24 detects that the electric heating water tank 21 is When the water was at a high water level, the control water inlet valve 216 was closed to stop adding water. In this embodiment, the electric heating water tank 21 is also provided with a circulating water pump 22. By controlling the start and stop of the circulating water pump 22, the circulation in the electric heating water tank 21 is realized, so that the heating temperature of water and gas is more uniform.

In this embodiment, a communication module electrically connected to the controller 13 is also included. The specific communication module includes a wired communication module and a wireless communication module. The controller 13 is connected to the host computer through the communication module. The host computer includes an industrial computer and a human-computer interaction system. 1. Specifically, it is an industrial computer 12, a human-computer interaction device 11, and the like. In order to be able to operate the host computer better, it is fixed on the console 19. At the same time, a multi-channel data recorder 18 is also provided, through which the multi-channel data recorder 18 is connected with the second temperature sensor 37 and the differential pressure sensor 38 through a 20mA signal to monitor sensor data in real time. In this embodiment, the wired communication module mainly adopts the RS485 communication mode, and performs data transmission with the Modbus protocol.

Controller 13 can adopt single-chip microcomputer or PLC, and in the present embodiment, adopts Siemens PLC module, is specifically Siemens 6ES7 288-1ST20-0AA1 PLC, and the upper computer based on Siemens WINCC 7.4 configuration software development is installed on industrial computer 12. The first temperature sensor 23 , the second temperature sensor 37 and the pressure sensor are all of the three-wire type, wherein the range of the pressure sensor is 2kpa, and the range of the temperature sensor is 100°C.

In this embodiment, since the extracted gas is water vapor, in order to avoid water accumulation in the airbag 35 during the detection process, a gas-water separation device 213 is designed at the air inlet 211 of the air pump 214 to separate the water vapor in the hot gas, and at the same time In this embodiment, the accumulated water separated by the gas-water separator 213 can also be returned to the electric heating water tank 21 for recycling.

In this embodiment, the electric heating water tank 21 includes a water tank shell and a water tank liner. The bottom of the water tank liner is provided with a mounting groove for placing the heating pipe 25, and a partition 26 is provided on the mounting groove to provide a heating pipe. A more stable and secure working environment. Simultaneously four corners of water tank shell bottom are all provided with universal fixed caster 27, so just can realize the movable function of water tank, wherein wherein universal fixed caster 27 also has braking function simultaneously, can make electric heating water tank 21 after moving stability. In this embodiment, the size of the tank liner is 1x0.5x0.5m; effective volume: 0.25m ³ ; it is made of double-layer 304 stainless steel. In this embodiment, insulation cotton is also sandwiched between the outer shell of the water tank and the liner of the water tank, and the thermal insulation effect of the electric heating water tank is better through the arrangement of the insulation cotton.

Embodiment two

Compared with Embodiment 1, the difference of this embodiment is that a solenoid valve is provided between the detection connection port 36 of the detection gas circuit 31 and the air bag 35, and a side of the solenoid valve close to the air bag 35 is provided with A gas detection mechanism electrically connected to the controller 13.

In this solution, the operator installs the corresponding air bag 35 on the corresponding electromagnetic valve. Since there are multiple detection connection ports 36 of the detection air circuit 31, the operator installs the air bag 35 to the corresponding detection connection port 36. When the corresponding electromagnetic valve is on, the corresponding electromagnetic valve will be opened, so that the electromagnetic valve corresponding to the air intake end of the air bag 35 is installed in an open state, and then the controller 13 will control the start of the air pump 214 and the air pump 210, and the The corresponding gas is filled into the air bag 35, so that the solenoid valve corresponding to the air inlet end where the air bag 35 is installed can be ventilated. Mechanism to detect whether the electromagnetic valve is opened, so as to detect the number of airbags 35 installed on the detection bracket, and the controller 13 is used to control the operation of the air pump 214 and the air pump 210 according to the detected number of installed airbags 35 power.

Embodiment three

Compared with Embodiments 1 and 2, the difference in this embodiment is that when the controller 13 is electrically connected to the air pump 214, the air pump 210 and the heating pipe 25, an AC contactor 14 is connected between them, and A surge suppressor 15 is provided. Specifically, an AC contactor 14 is connected between the controller 13 and the air pump 214, between the controller 13 and the air pump 210, and between the controller 13 and the heating pipe 25, and a corresponding surge suppressor 15 is configured. . In this embodiment, both the AC contactor 14 and the surge suppressor 15 are arranged on the operating platform 19 .

The setting of the AC contactor 14 can make the corresponding circuit have the function of overcurrent fuse protection, and the setting of the corresponding surge suppressor 15 can protect the controller 13 from the damage caused by the air pump 210, the air pump 214 and the heater starting. Shock, better protect the controller 13. In this embodiment, the AC contactor 14 of the circuit where the air suction pump 214 and the air pump 210 are located is CJX6511 M5, and the AC contactor 14 of the circuit where the heating tube 25 is located is CJX2510 M5. The corresponding surge suppressor 15 is SRC/220V AC.

The above are only embodiments of the present utility model, and the utility model is not limited to the field involved in this implementation case. The common knowledge such as the specific structure and characteristics known in the scheme is not described too much here, and those of ordinary skill in the art know the date of application or All ordinary technical knowledge in the technical field to which the utility model belongs before the priority date, can know all the prior art in this field, and have the ability to apply conventional experimental means before the date Under the inspiration, to improve and implement this solution in combination with one's own ability, some typical known structures or known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the utility model, some deformations and improvements can also be made, and these should also be regarded as the protection scope of the utility model, and these will not affect the utility model. Effects of novel implementations and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (7)

1. Gasbag thermal fatigue detection device for positive pressure oxygen respirator, its characterized in that: the device comprises a controller, a hot gas source gas supply device and a thermal fatigue detection test bed;

the hot gas source gas supply device comprises an electric heating water tank, a first temperature sensor, an inflator pump, an air pump and an electric valve; a heating module is arranged in the electric heating water tank; the first temperature sensor is arranged in the electric heating water tank;

the air inlet of the air pump is communicated with indoor air, the air outlet of the air pump is connected with the air inlet pipe of the electric heating water tank, and the air outlet pipe of the electric heating water tank is connected with the air inlet of the air pump; the air outlet of the air pump is connected with the air inlet of the electric valve;

the thermal fatigue detection test bed comprises a second temperature sensor, a differential pressure sensor, a pressure relief valve, a detection gas circuit, an air bag and an alarm; the air inlet of the detection air circuit is connected with the air outlet of the electric valve; the detection connecting port of the detection gas circuit is connected with an air bag sleeve nut fixedly connected with the air bag through threads; the detection end of the second temperature sensor is connected to the upper end part of the detection gas circuit through threads, and the detection port of the differential pressure sensor is communicated with the air bag pressure sampling port; the air outlet of the detection air circuit is connected with a pressure relief valve;

the controller is electrically connected with the heating module, the first temperature sensor, the inflator pump, the air pump, the electric valve, the second temperature sensor, the differential pressure sensor and the alarm respectively.

2. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 1, wherein: the heating module comprises a plurality of heating pipes, and each heating pipe is controlled by a controller.

3. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 1, wherein: the electric heating water tank is also provided with a water inlet valve and a water level sensor which are electrically connected with the controller; the water inlet valve is arranged at the water inlet end of the outer wall of the electric heating water tank; the water level sensor is arranged on the inner side wall of the electric heating water tank.

4. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 3, wherein: the alarm comprises a buzzer and a warning lamp.

5. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 1, wherein: and a gas-water separation device is arranged between the air inlet of the air pump and the air outlet pipe of the electric heating water tank.

6. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 2, wherein: the electric heating water tank comprises a water tank shell and a water tank liner; the bottom of the water tank liner is provided with an installation clamping groove for placing a heating pipe, and the installation clamping groove is also provided with a partition plate; and universal fixed casters are arranged at four corners of the bottom of the water tank shell.

7. The airbag thermal fatigue detection device for a positive pressure oxygen respirator according to claim 1, wherein: the thermal fatigue detection test bed further comprises a detection bed, the detection gas circuit is arranged on the detection bed through the fixed supporting seat, a plurality of detection connection ports for installing and connecting the air bags are arranged on the detection gas circuit, and the detection gas circuit is wrapped with heat preservation cotton.

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