Combustion dummy clothing evaluation system / combustion dummy is used to test the overall thermal protection performance of clothing. The complete combustion dummy system, consisting of combustion chamber, combustion dummy and air supply control system, etc.
Product Description.
Burning dummy clothing evaluation system / burning dummy consists of a combustion chamber, burning dummy and air supply control system, etc., can be used to score the level of heat protection of clothing, accurate and reliable testing.
Testing standards.
ISO 13506, ASTM F1930 are suitable for this test system.
Product Description.
Burning dummy clothing evaluation system / burning dummy is used to test the overall thermal protection performance of * clothing. The complete burning dummy system, consisting of combustion chamber, burning dummy and air supply control system, etc.
Product description.
* Since then, how to objectively and scientifically evaluate *, fireproof clothing, firefighting clothing, flame retardant and high temperature resistant work clothing and other special clothing protection performance, is a problem that plagues the industry. At present, this evaluation can generally only be made according to the burning of clothing fabrics or flame retardant experiments, can not reflect the actual effect of the composition of clothing and human action, and even cause the overall clothing in the actual working environment of the consequences of insufficient or excessive protection. The system is completely .
Design principle.
The system is mainly composed of combustion dummy, data acquisition device, flame generation and control device, skin heat transfer model and burn assessment model, as well as the system centralized control and application software platform. The design principle is to simulate the thermal exposure process of the dressed human body in the burning flame, test the change of the surface temperature of the dummy, and predict the percentage of second and third degree burns and total burn area that may be caused to the skin, the larger the percentage of burn area, the worse the flame retardant protection performance of the garment.
Burning dummy: the duration of the flame of the burning dummy body for clothing testing is generally 4 s. The surface of the dummy may need to withstand a burning flame of up to 300 ℃, so the dummy body material must have good thermal stability under a short burning flame of 300 ℃ or more, and can withstand the harsh fire environment; the response of the sensors laid on the surface of the dummy to the burning flame should be similar to the response of human skin to the burning flame The response to the burning flame should be close to the response of the human skin to the burning flame; data acquisition and processing device can quickly collect the sensor data on the surface of the dummy.
Burning dummy body: according to the above design requirements, through the comparison and analysis of the physical properties of high temperature resistant materials, the current temperature resistance grade zui, mechanical properties, dielectric properties, corrosion resistance of polyimide as the main material of the burning dummy body, according to the appearance characteristics of the dummy model, according to the following process to manufacture the dummy body model: synthetic polyimide → curing resin material → making the human anatomical segment mold and High temperature molding → vacuum curing → surface treatment.
Dummy surface heat sensor: The role of the dummy skin surface heat sensor is to sense the degree of human skin heat exposure in the fire environment, based on which to predict the degree of skin burns that may occur. The main thermal sensors used abroad are TPP copper sheet heat flow meter sensor, adiabatic copper sheet sensor and embedded thermocouple sensor. Among these 3 sensors, the copper sheet heat transfer flow sensor is a commonly used and reliable thermal sensor.
Experiments show that.
The adiabatic copper sheet sensor is similar to the TPP copper sheet heat flow meter sensor, with stable readings, rapid response, wide range and good repeatability, while the sensor size is smaller than the TPP sensor, taking up much less space and mass than the TPP copper sheet heat flow meter. The average response speed of the embedded thermocouple sensor is slower than that of the adiabatic copper sheet sensor under high thermal environment. For this reason, the group developed an adiabatic copper sheet sensor with a diameter of 1 cm and a thickness of 0.16 cm. Using a brazing process, the copper sheet was connected to a K-type thermocouple with a wire diameter of 0.2 mm, and a measurement accuracy of 0.2 °C was achieved.
Sensor placement: Considering the dummy area, data acquisition, and burn evaluation calculation, 120 adiabatic copper sensors were evenly placed on the dummy surface. When installing the sensors, holes were drilled with a milling cutter according to the diameter and depth of the copper sheet to ensure a close fit between the sensor surface and the dummy body, and a uniform distribution of sensors.
Experimental procedure.
Combustion dummy around a total of 6 groups of 12 flamethrowers installed, each flamethrower can provide 84 kilowatts / square meter (KW / m2) heat flow in 2 seconds to 3 seconds, realistic simulation of the real fire scene critical state of deflagration flash fire. In the experiment, all the flamethrowers ignited together, 12 fire dragons rose up in the air, wearing fireproof clothing burning dummies instantly that is up to 3 meters of flames engulfed and drowned. In order to study the reality of the human body in the fire emergency strain characteristics, research experts also through the suspension of the way, so that the burning dummy in the fire "move", with different speeds automatically adjust the orientation of the dummy and orientation. At the end of the experiment, by analyzing the data output from each sensor on the dummy and calculating the heat flow, the burn level of the skin surface where each sensor is located, the total burn area, and the time to constitute secondary and tertiary burns can be accurately reported.
The system fully meets the relevant technical specifications of ISO13506, ASTMF1930 and other burn dummy system evaluation. Dummy whole body set up 110 heat flow sensor, covering the torso, head, hands, feet and other parts, not only can be used for heat * clothing assessment, but also to meet the needs of the helmet, gloves, fire boots and other complete set of thermal protection equipment assessment.
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