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Generate metal drop device:
① Oxyacetylene torch melting metal wire (stick) one end, welding tip caliber (1.2±0.1)mm;
② The movement of metal wire (stick) control by wheel system motor speed regulation, motor wire feed rate(10±1)g/min;
③ Welding nozzle center vertical with wire (stick), the distance between welding tip and wire(stick) adjustable, usually its 12mm;
④ Droplet weight (0.50±0.05)g;
⑤ Generate droplet frequency 20 drops/(min±3s);
⑥ Start distance from wire to welding burner;
⑦ Length of welding torch deep blue flame core;
Droplet guide mechanism:
① Funnel guide: the angel between guidance axis and vertical adjustable, caliber can through diameter (8±0.2)mm metal strip, add lid on guide slot for it can cover when it not using.
② Holder: bearing and funnel guide, its three dimensional adjustable.
Temperature sensing system:
① Sensor support: refractory insulation material, pyroconductivity is (0.125±0.015）W/（m.K), specific heat 1.15J/ (g.K) groove dimension of surface (13.5×11) mm while 40℃.
② Temperature sensing system: armoured platinum resistor, coating high temperature adhesive, resistance100Ω, Clitheriform, dimension (12.5×10) mm, thermal response time≤0.5s while 0℃.
③ Record display: can display warming and its corresponding droplet no. time, frequency value on sample back; Guide slot test temperature>250℃, temperature rise on sample back≥40K will alert.
④ Precision: resolution ratio≤±0.5K, deviation between temperature display and alert function test ≤±0.4K.
⑤ Structure and install: temperature sensor can contact by groove center nearby two hole's guide line, four sides bolt can fix sensor support on sample frame.
Sample frame:
① Sample holder support can guarantee sample cling to sensor;
② Put（175±5）g pre-tension on sample;
③ The location of sample on vertical and horizontal direction adjustable.
Instrument is equipped with professional computer software.
Oxygen and acetylene gas need to purchase on your local by yourself.
Application
It is used to determine the impact performance of high-temperature metal melt droplets in protective clothing and the high-temperature protection performance of textiles.
