Bionic test system for fire experiment and implementation method

Abstract

The invention discloses an implementation method of a bionic test system for a fire experiment, and belongs to the technical field of fire experiments. Comprising a detection gas chamber, a multipath analog switch I, a multipath analog switch II, a multipath analog switch III, a CPU, a thermocouple signal conversion chip, a wireless radio frequency transceiver I, a wireless radio frequency transceiver II, a direct current aspirator pump, a USB memory, an industrial touch screen, a K-type thermocouple I, a K-type thermocouple II, a K-type thermocouple III, a K-type thermocouple IV, a K-type thermocouple V and a K-type thermocouple VI. The gas sensor I, the gas sensor II, the gas sensor III, the gas sensor IV, the gas sensor V, the gas sensor VI, the MOS switch, the lithium battery, the plurality of gas sensors and the thermocouple are arranged on the human body model; in a fire experiment, the temperature change and the smoke concentration change of each layout point position of the human body model in a fire scene environment are recorded in real time, and the fire spreading trend is observed, so that a data basis is provided for evaluating the harm degree of automobile fire to passengers in a cab.

Description

Technical Field

[0001] The invention relates to a bionic test system for fire experiments and an implementation method thereof, belonging to the technical field of fire experiments. Background Art

[0002] Car fires not only cause great property losses, but also pose a serious threat to the personal safety of the passengers in the car. Major automobile manufacturers are particularly concerned about how to improve the safety of passengers in the cab after a car fire occurs. Conducting vehicle fire simulation experiments, collecting data such as the temperature and smoke concentration in the cab during a car fire, and evaluating the hazards of car fires to passengers are important prerequisites for improving the safety of passengers in the cab.

[0003] At present, various research institutions have installed thermocouples and gas sensors in specific locations in the cab to monitor the changing trends of the temperature and smoke concentration in the cab, so as to characterize the thermal hazards and toxic damage of the temperature and smoke in the vehicle to the occupants. However, this acquisition method has many defects. First, the thermocouples are directly arranged at points simulating the key parts of the occupants' bodies, and the measured results are often different from the occupants' real feelings. For example, when there is an open fire at the lower right side of the seat, the risk of burns to the right knee of the occupant is high, while the risk of burns to the left knee is relatively small. When thermocouples are directly arranged at the positions corresponding to the left and right knees, due to the small distance between the two thermocouples, the left knee can still collect a higher temperature under the effect of thermal radiation, which is inconsistent with the actual phenomenon; secondly, the arrangement of the gas sensor does not consider the influence of gas disturbance caused by breathing on the smoke concentration, and the measured smoke concentration in the cab is quite different from the smoke concentration inhaled by the occupants; thirdly, when the flame spreads to the cab, the instruments and equipment exposed inside the cab are very easy to burn, and the length of data that can be collected after the cab catches fire is limited; finally, the distributed arrangement of multiple types of sensors also faces the risk of asynchronous data collection and unreliable transmission. In summary, the current test equipment and means are difficult to restore the real temperature and smoke feeling of the human body in the fire environment, and there are risks of insufficient, asynchronous and unreliable data collection. Based on this, it is necessary to develop a bionic test system and implementation method for fire experiments, using a proportional human body model integrated with thermocouples and gas sensors to comprehensively and synchronously collect various data while realizing the collection of human fire hazard perception data in automobile fire simulation experiments. Summary of the invention

[0004] In view of the problem in the prior art that it is difficult to simulate the real temperature and smoke sensation of the human body in a fire environment due to the distributed arrangement of sensors, the present invention provides a bionic test system for fire experiments and an implementation method thereof. A proportional human body model is used to integrate gas sensors and thermocouples on the human body model to simulate human senses, and a DC suction pump is used to simulate the breathing process of the occupants. In the fire experiment, the temperature changes of the human body at each arrangement point and the changes in the smoke concentration inhaled by the occupants are comprehensively and synchronously recorded, thereby restoring the real temperature and smoke sensation of the human body in a fire environment, and providing a data basis for improving the safety of occupants in the cab.

[0005] The technical solution adopted by the present invention is: a bionic test system for fire experiment, wherein a lithium battery is respectively connected with a CPU, a MOS switch, a multi-way analog switch I, a multi-way analog switch II, a multi-way analog switch III, a thermocouple signal conversion chip, a wireless radio frequency transceiver I, and a gas sensor I, a gas sensor II, a gas sensor III, a gas sensor IV, a gas sensor V, and a gas sensor VI arranged in a detection gas chamber; The CPU is respectively connected to a multi-way analog switch I, a multi-way analog switch II, a multi-way analog switch III, a thermocouple signal conversion chip, a wireless radio frequency transceiver I and a MOS switch; the multi-way analog switch I is respectively connected to a K-type thermocouple I, a K-type thermocouple II, a K-type thermocouple III, a K-type thermocouple IV and a thermocouple signal conversion chip; the multi-way analog switch II is respectively connected to a K-type thermocouple V, a K-type thermocouple VI, a gas sensor I, a gas sensor II and a thermocouple signal conversion chip; the multi-way analog switch III is respectively connected to a gas sensor III, a gas sensor IV, a gas sensor V and a gas sensor VI; the wireless radio frequency transceiver I is connected to the MOS switch; the wireless radio frequency transceiver I is connected to the wireless radio frequency transceiver II through wireless communication; the industrial touch screen is respectively connected to the wireless radio frequency transceiver II and a USB memory; the MOS switch is connected to the detection gas chamber through the air supply pipe of the DC suction pump.

[0006] A method for realizing a bionic test system for a fire experiment comprises the following steps: fixing a main control board inside a human model's chest cavity, arranging an air intake pipe of a direct current suction pump inside the human model to the position of the human model's nostril, setting a K-type thermocouple I at another nostril position outside the human model, setting a K-type thermocouple II at the position of the chest outside the human model, setting a K-type thermocouple III at the position of the back of the left hand outside the human model, setting a K-type thermocouple IV at the position of the back of the right hand outside the human model, setting a K-type thermocouple V at the position of the left knee outside the human model, setting a K-type thermocouple VI at the position of the right knee outside the human model, and placing the human model in a car wearing high-temperature-resistant and radiation-proof clothing; After the system is turned on, the fire test begins. The CPU drives the MOS switch, and the DC suction pump starts working, sending the gas in the detection area of ​​the vehicle into the detection air chamber through the air intake pipe and the air delivery pipe, and then returns to the vehicle through the air outlet of the detection air chamber, the back hole of the human model, and the high temperature and radiation resistant clothing, and the cycle repeats. Step 1: The CPU selects channel Ⅰ of the multi-way analog switch Ⅰ, channel Ⅱ of the multi-way analog switch Ⅰ, channel Ⅲ of the multi-way analog switch Ⅰ and channel Ⅳ of the multi-way analog switch Ⅰ in sequence. The signals of K-type thermocouple I, K-type thermocouple II, K-type thermocouple III and K-type thermocouple IV enter the thermocouple signal conversion chip in turn, and the thermocouple signal conversion chip automatically converts the thermocouple signals into digital temperature values ​​in turn. The CPU reads the converted temperature values ​​and stores them in the CPU memory in turn. Step 2, the CPU selects channel I of the multi-way analog switch II and channel II of the multi-way analog switch II respectively, the signals obtained by the K-type thermocouple V and the K-type thermocouple VI enter the thermocouple signal conversion chip respectively, the thermocouple signal conversion chip automatically converts the thermocouple signals into digital temperature values ​​in turn, the CPU reads the converted temperature values ​​and stores them in the CPU memory in turn, the CPU selects channel III of the multi-way analog switch II and channel IV of the multi-way analog switch II respectively, the CPU serial port is connected to the serial ports of the gas sensor I and the gas sensor II in turn, the CPU sends a query instruction, the gas sensor I and the gas sensor II reply with the obtained concentration data, the CPU reads the returned concentration data in turn, and stores it in the memory; Step 3: The CPU selects channel I of the multi-way analog switch III, channel II of the multi-way analog switch III, channel III of the multi-way analog switch III, and channel IV of the multi-way analog switch III in sequence. The CPU serial port is connected to the serial ports of gas sensor III, gas sensor IV, gas sensor V and gas sensor VI in turn, the CPU sends a query command, gas sensor III, gas sensor IV, gas sensor V and gas sensor VI reply with the acquired concentration data, the CPU reads the returned concentration data in turn and stores it in the memory; Step 4: After completing the above collection work, the CPU packages the temperature and concentration data, adds the check word, and sends it to the wireless RF transceiver II through the wireless RF transceiver I; Step 5: The industrial touch screen reads the temperature and concentration data received by the wireless RF transceiver II in real time through the serial port, displays them graphically on the industrial touch screen according to the actual measurement point layout, and stores them in the USB memory every 1 second; Through the above steps, it is achieved that in the event of a fire, the smoke in the car can be tested for concentration changes through the inhalation detection chamber and the changes in the ambient temperature of the human model are sensed, providing a data basis for evaluating the degree of harm caused by the car fire to the occupants in the cab.

[0007] The beneficial effects of the present invention are as follows: in the current vehicle fire simulation experiment, the sensors arranged in a distributed manner in the cab are difficult to restore the real feelings of the human body during the fire process, and face the problems of incomplete, asynchronous and unreliable data collection. The present invention avoids the difference between the temperature data collected in a distributed manner and the human body's perception of the fire temperature by arranging thermocouples at key parts of the human body model; the air intake pipe is placed at the position of the human body model's nostrils to simulate the inhalation state during breathing, and the smoke can be tested for its concentration change by inhalation in the case of a fire. By combining a DC suction pump with a gas sensor, the error between the static smoke concentration in the cab and the smoke concentration inhaled by the occupants is avoided, and the effective collection of human fire hazard perception data in the fire simulation experiment is realized; the sensor and the data transmission equipment are both located inside the human body model wearing a special high-temperature resistant and radiation-proof heat clothing, which can effectively isolate the external high temperature in the early stage of the fire, and the data can still be collected within a certain period of time after the fire in the cab, and the data can be transmitted to the industrial touch screen in the control room through the transmission mode, which can significantly increase the amount of effective data after the cab is on fire; at the same time, the actual human body model is used to replace the original distributed arrangement, which also reduces the risk of asynchronous and unreliable collection caused by the distributed arrangement.

[0008] A proportional human body model was used, and gas sensors, thermocouples, etc. were integrated and arranged on the human body model. In the fire experiment, the temperature changes and smoke concentration changes of each layout point of the human body model in the fire environment were recorded in real time, and the fire spread trend was observed. In the event of a fire, the smoke in the car was tested for concentration changes through the inhalation detection chamber and the changes in the ambient temperature of the human body model were perceived, providing a data basis for evaluating the degree of harm of a car fire to the occupants in the cab.

[0009] The present invention can be applied in fire simulation experiments in multiple scenarios such as automobiles, buildings and other passenger transportation facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a system connection block diagram of the present invention; Figure 2 Schematic diagram of the main control board of the present invention; Figure 3 is a schematic diagram of a human model of the present invention; Figure 4 is a schematic diagram of the back of a human model of the present invention; Figure 5 The present invention is a flowchart of a method for implementing the present invention.

[0011] In the figure: 1. Detection air chamber; 1-1. Air outlet; 2. Main control board; 3. DC suction pump; 3-1. Air inlet pipe; 3-2. Air delivery pipe; 4. Human model; 4-1. Back hole. DETAILED DESCRIPTION

[0012] like Figures 1 to 4 As shown, a bionic test system for fire experiment includes a detection air chamber 1, a multi-channel analog switch Ⅰ, a multi-channel analog switch Ⅱ, a multi-channel analog switch Ⅲ, a CPU, a thermocouple signal conversion chip, a wireless radio frequency transceiver Ⅰ, a wireless radio frequency transceiver Ⅱ, a DC suction pump 3, a USB memory, an industrial touch screen, a K-type thermocouple Ⅰ, a K-type thermocouple Ⅱ, a K-type thermocouple Ⅲ, a K-type thermocouple Ⅳ, a K-type thermocouple Ⅴ, a K-type thermocouple Ⅵ, a gas sensor Ⅰ, a gas sensor Ⅱ, a gas sensor Ⅲ, a gas sensor Ⅳ, a gas sensor Ⅴ, a gas sensor Ⅵ, a MOS switch, and a lithium battery.

[0013] Multi-channel analog switch Ⅰ, multi-channel analog switch Ⅱ, multi-channel analog switch Ⅲ, CPU, thermocouple signal conversion chip, wireless radio frequency transceiver Ⅰ, DC suction pump 3, MOS switch, lithium battery, gas sensor Ⅰ, gas sensor Ⅱ, gas sensor Ⅲ, gas sensor Ⅳ, gas sensor Ⅴ and gas sensor Ⅵ are respectively arranged on the main control board 2, the detection gas chamber 1 is buckled on the gas sensor Ⅰ, gas sensor Ⅱ, gas sensor Ⅲ, gas sensor Ⅳ, gas sensor Ⅴ and gas sensor Ⅵ, and an air outlet 1-1 is arranged on the side of the detection gas chamber 1; the detection gas chamber 1 is made of high temperature resistant silicone material.

[0014] The multi-channel analog switch I is used to switch the input channel under the control of the CPU, allowing the K-type thermocouple I-IV signals to enter the thermocouple signal conversion chip in a time-sharing manner; The multi-channel analog switch II is used to switch channels under the control of the CPU, allowing the K-type thermocouple V and K-type thermocouple VI to enter the thermocouple signal conversion chip in a time-sharing manner, and allowing the CPU to read the concentration data of the gas sensor I and gas sensor II through the serial interface in a time-sharing manner; The multi-channel analog switch III is used to switch channels under the control of the CPU, allowing the CPU to read the concentration data of the gas sensor III, the gas sensor IV, the gas sensor V, and the gas sensor VI through the serial interface in a time-sharing manner. The models of the multi-channel analog switch I, the multi-channel analog switch II, and the multi-channel analog switch III are all CD4052; The CPU is used for system task scheduling, to read the temperature and gas sensor concentration data from the thermocouple signal transmitter, to drive the MOS switch to power the DC suction pump 3, and to drive the wireless RF transceiver I to send the temperature and concentration data to the wireless RF transceiver II; The thermocouple signal conversion chip is used to convert the K-type thermocouple signal entered through the multi-way analog switch I and the multi-way analog switch II into temperature data, which is read by the CPU through the SPI interface. The model of the thermocouple signal conversion chip is MAX31856; The wireless radio frequency transceiver I is used to send the temperature data and the gas sensor concentration data to the wireless radio frequency transceiver II in the form of a wireless radio frequency signal; Wireless RF transceiver II is used to receive temperature data and gas sensor concentration data sent by wireless RF transceiver I, and is read by the industrial touch screen through the serial port. The chip model used by wireless RF transceiver I and wireless RF transceiver II is Si4463; The DC suction pump 3 is used to absorb the gas from the detected environment and enter the detection air chamber 1. The air inlet pipe 3-1 and the air delivery pipe 3-2 are both made of high-temperature resistant silicone air pipes; The USB memory is used to store the temperature and gas concentration data received by the industrial touch screen; The industrial touch screen is used to receive data from the wireless RF transceiver II, display the temperature data of the K-type thermocouple I-VI and the concentration data of the gas sensor I-VI in real time in the form of screen configuration, and store the data in a USB memory; The MOS switch is used to supply power to the DC suction pump 3 under the control of the CPU; A K-type thermocouple I is arranged on the face of the mannequin 4 to measure the temperature of the face of the mannequin 4; A K-type thermocouple II is arranged on the chest of the mannequin 4 to measure the chest temperature of the mannequin 4; The K-type thermocouple III is arranged on the back of the left hand of the mannequin 4, and is used to measure the temperature of the left hand of the mannequin 4; A K-type thermocouple IV is arranged on the back of the right hand of the mannequin 4 to measure the temperature of the right hand of the mannequin 4; A K-type thermocouple V is disposed on the left knee of the mannequin 4 and is used to measure the temperature of the left knee of the mannequin 4; A K-type thermocouple VI is disposed on the right knee of the mannequin 4 and is used to measure the temperature of the right knee of the mannequin 4; The burning of the car battery and other parts causes the temperature of various parts of the human body model 4 inside the vehicle to change, and the temperature change trends of different temperature measuring points are not the same; the K-type thermocouple uses an extremely fine probe package with a fast induction speed and can respond to the temperature changes of different measuring points in real time. The temperature measurement range of the K-type thermocouple is: 0-1000℃.

[0015] The specific positions of the six gas sensors in the detection chamber 1 are: The first row is: gas sensor Ⅰ, gas sensor Ⅲ, gas sensor Ⅱ; The second row is: gas sensor IV, gas sensor VI, gas sensor V; Gas sensor Ⅰ is used to measure the CO concentration in the detection air chamber 1 inhaled by the human model 4, and the CO concentration range is 0-20000ppm; Gas sensor II is used to measure the NO2 concentration in the detection chamber 1 inhaled by the human model 4, and the NO2 concentration range is 0-2000ppm; Gas sensor III is used to measure the SO2 concentration in the detection air chamber 1 inhaled by the human model 4, and the SO2 concentration range is 0-2000ppm; Gas sensor IV is used to measure the H2S concentration in the detection air chamber 1 inhaled by the human model 4, and the H2S concentration range is 0-2000ppm; The gas sensor V is used to measure the H2 concentration in the detection air chamber 1 inhaled by the human model 4, and the H2 concentration range is 0-2000ppm; The gas sensor VI is used to measure the CO2 concentration in the detection air chamber 1 inhaled by the human model 4, and the CO2 concentration range is 0-5000ppm.

[0016] The lithium battery is used to power the CPU, MOS switch, multi-way analog switch I, multi-way analog switch II, multi-way analog switch III, thermocouple signal conversion chip, wireless RF transceiver I, gas sensor I, gas sensor II, gas sensor III, gas sensor IV, gas sensor V, and gas sensor VI.

[0017] Embodiment 1, as Figure 5 As shown, a method for realizing a bionic test system for a fire experiment comprises the following steps: fixing a main control board 2 to the chest cavity of a human model 4 through a back hole 4-1 of a human model 4, inserting an air intake pipe 3-1 of a DC suction pump 3 into the nostril position of the human model 4 inside the human model, setting a K-type thermocouple I at another nostril position outside the human model 4, setting a K-type thermocouple II at the chest position outside the human model 4, setting a K-type thermocouple III at the back of the left hand outside the human model 4, setting a K-type thermocouple IV at the back of the right hand outside the human model 4, setting a K-type thermocouple V at the left knee position outside the human model 4, setting a K-type thermocouple VI at the right knee position outside the human model 4, and placing the human model 4 in a car wearing high temperature resistant and radiation proof clothing; placing an industrial touch screen connected to a USB memory and a wireless radio frequency transceiver II at a position far away from the fire scene (control room), ensuring that the position allows operators to approach and view the industrial touch screen.

[0018] Step 1: Before the test, turn on the power switch of the main control board 2 inside the chest cavity of the mannequin 4 in advance, the CPU starts to work, initializes the wireless RF transceiver I and the thermocouple signal conversion chip, and turns on the MOS switch, the DC suction pump 3 starts to work, and the gas in the detection area in the car is sent into the detection air chamber 1 through the air intake pipe 3-1 and the air delivery pipe 3-2, and then returns to the car through the air outlet 1-1 of the detection air chamber 1, the back hole 4-1 of the mannequin 4, and the high temperature and radiation resistant clothing, and the cycle is repeated; K-type thermocouples I placed at the nostrils of the mannequin, II placed at the chest surface, III placed at the back of the left hand, IV placed at the back of the right hand, V placed at the left knee, and VI placed at the right knee began to sense temperature changes; The CPU selects channel I of the multi-channel analog switch I, and the signal of the K-type thermocouple I enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel II of the multi-channel analog switch I, and the signal of the K-type thermocouple II enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel III of the multi-channel analog switch I, and the signal of the K-type thermocouple III enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch I, and the signal of K-type thermocouple IV enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory.

[0019] Step 2: The CPU selects channel I of the multi-channel analog switch II, and the signal of the K-type thermocouple V enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel II of the multi-channel analog switch II, and the signal of the K-type thermocouple VI enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 28°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel III of the multi-channel analog switch II. At this time, the CPU serial port and the serial port of the gas sensor I are connected. The CPU sends a query command, and the gas sensor I returns the concentration data of 0 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch II. At this time, the serial port of the CPU and the serial port of the gas sensor II are connected. The CPU sends a query instruction, and the gas sensor II replies with the concentration data 0 ppm. The CPU reads the returned concentration data and stores it in the memory.

[0020] Step 3: The CPU selects channel I of the multi-channel analog switch III. At this time, the CPU serial port and the serial port of the gas sensor III are connected. The CPU sends a query command, and the gas sensor III replies with a concentration data of 0 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel II of the multi-channel analog switch III. At this time, the serial port of the CPU and the serial port of the gas sensor IV are connected. The CPU sends a query command, and the gas sensor IV replies with a concentration data of 0 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel III of the multi-channel analog switch III. At this time, the CPU serial port and the serial port of the gas sensor V are connected. The CPU sends a query command, and the gas sensor V replies with a concentration data of 0 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch III. At this time, the CPU serial port and the serial port of the gas sensor VI are connected. The CPU sends a query instruction, and the gas sensor VI replies with the concentration data of 650 ppm. The CPU reads the returned concentration data and stores it in the memory.

[0021] Step 4, the CPU cyclically detects the temperature of each point and the gas concentration sucked into the detection chamber 1 by the DC pump every 1 second. After completing one detection, the CPU packs the temperature and concentration data, adds the check word, and sends the temperature and concentration data to the wireless RF transceiver II through the wireless RF transceiver I. If the wireless RF transceiver I fails to send, the wireless RF transceiver I is reinitialized, and then the above-mentioned cyclic collection work is performed until the transmission is successful; Step 5: The industrial touch screen reads the temperature and concentration data received by the wireless RF transceiver II in real time through the serial port, displays them graphically on the industrial touch screen according to the actual measurement point layout, and stores them to the USB memory every 1 second.

[0022] The fire test begins. 5 minutes after the fire test begins, as the combustion of the battery and vehicle components spreads, the temperature inside the cab gradually rises. The K-type thermocouples Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ placed on the mannequin 4 sense the temperature change in real time. The combustion of the battery and combustible components also causes harmful gases to be gradually released and invade the cab. These gases are sucked into the DC suction pump 3 by the air intake pipe 3-1 at the nostrils of the mannequin 4, and then transported to the detection chamber 1 through the air delivery pipe 3-2. The gas sensors Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ in the detection chamber 1 sense the concentration of the corresponding gas type in real time. Step 1: The CPU selects channel I of the multi-channel analog switch I, and the signal of the K-type thermocouple I enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 30°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel II of the multi-channel analog switch I, and the signal of the K-type thermocouple II enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 35°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel III of the multi-channel analog switch I, and the signal of the K-type thermocouple III enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 41°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch I, and the signal of K-type thermocouple IV enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 43°C. The CPU reads the converted temperature value and stores it in the memory.

[0023] Step 2: The CPU selects channel I of the multi-channel analog switch II, and the signal of the K-type thermocouple V enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 48°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel II of the multi-channel analog switch II, and the signal of the K-type thermocouple VI enters the thermocouple signal conversion chip. The thermocouple signal conversion chip automatically converts the thermocouple signal into a digital temperature value of 50°C. The CPU reads the converted temperature value and stores it in the memory. The CPU selects channel III of the multi-channel analog switch II. At this time, the CPU serial port and the serial port of the gas sensor I are connected. The CPU sends a query command, and the gas sensor I returns the concentration data of 236ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch II. At this time, the serial port of the CPU and the serial port of the gas sensor II are connected. The CPU sends a query instruction, and the gas sensor II replies with a concentration data of 98ppm. The CPU reads the returned concentration data and stores it in the memory.

[0024] Step 3: The CPU selects channel I of the multi-channel analog switch III. At this time, the CPU serial port and the serial port of the gas sensor III are connected. The CPU sends a query command, and the gas sensor III replies with a concentration data of 99 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel II of the multi-channel analog switch III. At this time, the serial port of the CPU and the serial port of the gas sensor IV are connected. The CPU sends a query command, and the gas sensor IV replies with a concentration data of 86 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel III of the multi-channel analog switch III. At this time, the CPU serial port and the serial port of the gas sensor V are connected. The CPU sends a query command, and the gas sensor V replies with a concentration data of 63 ppm. The CPU reads the returned concentration data and stores it in the memory. The CPU selects channel IV of the multi-channel analog switch III. At this time, the serial port of the CPU and the serial port of the gas sensor VI are connected. The CPU sends a query instruction, and the gas sensor VI replies with the concentration data of 962 ppm. The CPU reads the returned concentration data and stores it in the memory.

[0025] Step 4: Since the gas sensor is arranged inside the mannequin 4, the high temperature of combustion will not quickly affect the measurement accuracy of the gas sensor, so the key gas concentration detection in the early stage of the fire can be guaranteed; The wireless radio frequency transceiver II receives the temperature and gas concentration data sent by the vehicle's wireless radio frequency transceiver I in real time, and stores the data in a USB memory.

[0026] Step 5: The industrial touch screen reads the temperature and concentration data received by the wireless RF transceiver II in real time through the serial port, displays them graphically on the industrial touch screen according to the actual measurement point layout, and stores them to the USB memory every 1 second.

[0027] Execute the above steps 1 to 5. The system will record the real-time data of temperature and smoke concentration 5 minutes, 10 minutes and 15 minutes after the start of the experiment, and display them on the industrial touch screen.

[0028] Table 1 shows the real-time temperature display of the corresponding parts of the human model: Table 2 shows the real-time display of gas concentration data from top to bottom on the right side of the display: .

[0029] When the experiment was carried out for 5 minutes, the outside of the vehicle caught fire but no flames were seen inside. As the vehicle was baked by the external flames, the overall temperature in the cab rose slightly. The 6 types of gases collected entered the cab through the weak points of the vehicle seal. Since it was in the early stage of the fire, the fire did not develop into the cab. From the perspective of temperature and gas concentration, the safety risk of the occupants in the cab was relatively low at this time, and the probability of survival was relatively high. When the experiment was carried out for 10 minutes, although there was still no open fire in the cab, due to the rapid development of the fire outside the vehicle, the temperature in the cab rose to 78°C at most, and the concentration of various toxic gases accumulated to a level that could cause injury to the occupants. At this time, although there was still no open fire in the car, the heat and toxic gases would cause relatively serious damage to the occupants. When the experiment was carried out for 15 minutes, due to the spread of the flames into the cab, the temperature at each position and the concentration of various gases rose sharply. Under the action of temperature and smoke, the occupants in the cab had almost no chance of survival.

[0030] As the experiment continues, the system continuously collects data on the temperature and smoke concentration in the cab, and by restoring the real feelings of the human body during a vehicle fire, provides a data basis for assessing the degree of harm caused by a car fire to the occupants in the cab.

[0031] In the later stage, as the fire grows, the human model 4 and its internal wireless RF transceiver Ⅰ, CPU, thermocouple signal conversion chip, DC suction pump 3, detection air chamber 1, air intake pipe 3-1, air delivery pipe 3-2, gas sensor, etc. will gradually fail due to high temperature. This invention focuses on detecting the temperature and concentration data in the early stage of fire, and is used to simulate the real feeling of human body to heat and smoke hazards in the early stage of fire.

Claims

1. A bionic test system for fire experiment, characterized in that: The lithium battery is respectively connected to the CPU, the MOS switch, the multi-way analog switch I, the multi-way analog switch II, the multi-way analog switch III, the thermocouple signal conversion chip, the wireless radio frequency transceiver I, and the gas sensor I, the gas sensor II, the gas sensor III, the gas sensor IV, the gas sensor V, and the gas sensor VI arranged in the detection gas chamber (1); The CPU is respectively connected to a multi-channel analog switch I, a multi-channel analog switch II, a multi-channel analog switch III, a thermocouple signal conversion chip, a wireless radio frequency transceiver I and a MOS switch; the multi-channel analog switch I is respectively connected to a K-type thermocouple I, a K-type thermocouple II, a K-type thermocouple III, a K-type thermocouple IV and a thermocouple signal conversion chip; the multi-channel analog switch II is respectively connected to a K-type thermocouple V, a K-type thermocouple VI, a gas sensor I, a gas sensor II and a thermocouple signal conversion chip; the multi-channel analog switch III is respectively connected to a gas sensor III, a gas sensor IV, a gas sensor V and a gas sensor VI; the wireless radio frequency transceiver I is connected to the MOS switch; the wireless radio frequency transceiver I is connected to the wireless radio frequency transceiver II through wireless communication; the industrial touch screen is respectively connected to the wireless radio frequency transceiver II and a USB memory; the MOS switch is connected to the detection gas chamber (1) through an air supply pipe (3-2) of a DC suction pump (3).

2. A bionic test system for fire experiment according to claim 1, characterized in that: The models of the multi-way analog switch I, multi-way analog switch II and multi-way analog switch III are all CD4052; the model of the thermocouple signal conversion chip is MAX31856; the chip model used by the wireless RF transceiver I and wireless RF transceiver II is Si4463.

3. A bionic test system for fire experiment according to claim 1, characterized in that: The multi-channel analog switch I, multi-channel analog switch II, multi-channel analog switch III, CPU, thermocouple signal conversion chip, wireless radio frequency transceiver I, DC air pump (3), MOS switch, lithium battery, gas sensor I, gas sensor II, gas sensor III, gas sensor IV, gas sensor V and gas sensor VI are respectively arranged on the main control board (2); the detection gas chamber (1) is buckled on the gas sensor I, gas sensor II, gas sensor III, gas sensor IV, gas sensor V and gas sensor VI; and an air outlet (1-1) is provided on the side of the detection gas chamber (1).

4. A bionic test system for fire experiment according to claim 1, characterized in that: The detection air chamber (1) is made of high temperature resistant silica gel.

5. A bionic test system for fire experiment according to claim 3, characterized in that: The specific positions of the six gas sensors in the detection gas chamber (1) are as follows: the first row is: gas sensor I, gas sensor III, gas sensor II; The second row is: gas sensor IV, gas sensor VI, gas sensor V; The gas sensor I is used to measure the CO concentration in the detection air chamber (1) inhaled by the human model (4), and the CO concentration range is 0-20000ppm; The gas sensor II is used to measure the NO2 concentration in the detection air chamber (1) inhaled by the human model (4), and the NO2 concentration range is 0-2000ppm; The gas sensor III is used to measure the SO2 concentration in the detection air chamber (1) inhaled by the human model (4), and the SO2 concentration range is 0-2000ppm; The gas sensor IV is used to measure the H2S concentration in the detection air chamber (1) inhaled by the human model (4), and the H2S concentration range is 0-2000ppm; The gas sensor V is used to measure the H2 concentration in the detection air chamber (1) inhaled by the human model (4), and the H2 concentration range is 0-2000ppm; The gas sensor VI is used to measure the CO2 concentration in the detection air chamber (1) inhaled by a human model (4), and the CO2 concentration range is 0-5000ppm.

6. A bionic test system for fire experiment according to claim 1, characterized in that: The specific positions of the K-type thermocouples are as follows: the K-type thermocouple I is arranged on the face of the mannequin (4), the K-type thermocouple II is arranged on the chest of the mannequin (4), the K-type thermocouple III is arranged on the back of the left hand of the mannequin (4), the K-type thermocouple IV is arranged on the back of the right hand of the mannequin (4), the K-type thermocouple V is arranged on the left knee of the mannequin (4), and the K-type thermocouple VI is arranged on the right knee of the mannequin (4).

7. A method for implementing the bionic test system for fire experiment according to any one of claims 1 to 6, characterized in that: The steps are as follows: fixing the main control board (2) inside the chest cavity of the mannequin (4), arranging the air intake pipe (3-1) of the direct current suction pump (3) inside the mannequin (4) to the position of the mannequin's nostril, setting a K-type thermocouple I at another nostril position outside the mannequin (4), setting a K-type thermocouple II at the chest position outside the mannequin (4), setting a K-type thermocouple III at the back of the left hand outside the mannequin (4), setting a K-type thermocouple IV at the back of the right hand outside the mannequin (4), setting a K-type thermocouple V at the left knee position outside the mannequin (4), setting a K-type thermocouple VI at the right knee position outside the mannequin (4), and placing the mannequin (4) in a car wearing high temperature resistant and radiation proof clothing; After the system is turned on, the fire test begins, the CPU drives the MOS switch, and the DC suction pump (3) starts working, sending the gas in the detection area in the vehicle into the detection air chamber (1) through the air intake pipe (3-1) and the air delivery pipe (3-2), and then returns to the vehicle through the air outlet (1-1) of the detection air chamber (1), the back hole (4-1) of the human model, and the high temperature and radiation resistant clothing, and the cycle repeats; Step 1: The CPU selects channel Ⅰ of the multi-way analog switch Ⅰ, channel Ⅱ of the multi-way analog switch Ⅰ, channel Ⅲ of the multi-way analog switch Ⅰ and channel Ⅳ of the multi-way analog switch Ⅰ in sequence. The signals of K-type thermocouple I, K-type thermocouple II, K-type thermocouple III and K-type thermocouple IV enter the thermocouple signal conversion chip in turn, and the thermocouple signal conversion chip automatically converts the thermocouple signals into digital temperature values ​​in turn. The CPU reads the converted temperature values ​​and stores them in the CPU memory in turn. Step 2, the CPU selects channel I of the multi-way analog switch II and channel II of the multi-way analog switch II respectively, the signals obtained by the K-type thermocouple V and the K-type thermocouple VI enter the thermocouple signal conversion chip respectively, the thermocouple signal conversion chip automatically converts the thermocouple signals into digital temperature values ​​in turn, the CPU reads the converted temperature values ​​and stores them in the CPU memory in turn, the CPU selects channel III of the multi-way analog switch II and channel IV of the multi-way analog switch II respectively, the CPU serial port is connected to the serial ports of the gas sensor I and the gas sensor II in turn, the CPU sends a query instruction, the gas sensor I and the gas sensor II reply with the obtained concentration data, the CPU reads the returned concentration data in turn, and stores it in the memory; Step 3: The CPU selects channel I of the multi-way analog switch III, channel II of the multi-way analog switch III, channel III of the multi-way analog switch III, and channel IV of the multi-way analog switch III in sequence. The CPU serial port is connected to the serial ports of gas sensor III, gas sensor IV, gas sensor V and gas sensor VI in turn, the CPU sends a query command, gas sensor III, gas sensor IV, gas sensor V and gas sensor VI reply with the acquired concentration data, the CPU reads the returned concentration data in turn and stores it in the memory; Step 4: After completing the above collection work, the CPU packages the temperature and concentration data, adds the check word, and sends it to the wireless RF transceiver II through the wireless RF transceiver I; Step 5: The industrial touch screen reads the temperature and concentration data received by the wireless RF transceiver II in real time through the serial port, displays them graphically on the industrial touch screen according to the actual measurement point layout, and stores them in the USB memory every 1 second; Through the above steps, in the event of a fire, smoke in the car is tested for concentration changes by inhaling the detection chamber (1) and sensing changes in the ambient temperature of the human model (4), thereby providing a data basis for evaluating the degree of harm caused by the car fire to the occupants in the cab.

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