LFY-239 Anti-Melt Metal Impact Performance Testing Instrument

Main purpose

It is used to measure the impact resistance of protective clothing against high-temperature metal droplets and the heat protection performance of textiles. 
Technical indicators
1. Device for generating metal droplets: 
(1) The oxy-acetylene welding torch melts one end of the metal wire (rod), with the nozzle diameter being (1.2 ± 0.1) mm; (2) The movement of the metal wire (rod) is controlled by the motor of the wheel system and the wire feeding rate of the motor is (10 ± 1) g/min; (3) The center line of the welding nozzle is perpendicular to the metal wire (rod), and the distance d between the nozzle opening and the metal (rod) can be adjusted, usually 12 mm; (4) The mass of the droplet is (0.50 ± 0.05) g; (5) The frequency of droplet generation is 20 drops/(min ± 3s); (6) The initial distance from the metal wire to the welding torch nozzle is 12 mm; (7) The length of the dark blue flame core of the welding torch is 8 mm. 
2. Droplet Guidance Mechanism 
(1) Guide slot device: The angle between the guide axis and the vertical plane can be adjusted, and the diameter of the guide slot can accommodate a metal strip with a diameter of (8 ± 0.2) mm. The cover of the guide slot opening is provided and should be closed when not in use. (2) Support: Supports and fixes the guide slot, with three-dimensional adjustable features. 
3. Temperature measurement sensing system 
(1) Sensor support: Flame-resistant insulating material, thermal conductivity at 40°C is (0.125 ± 0.015) W/(m.K), specific heat capacity is 1.15 J/(g.K), surface groove size is (13.5 × 11) mm; (2) Temperature sensor: Armored platinum resistance material, coated with high-temperature anti-sticking agent, resistance at 0°C is 100Ω, plate-shaped, size (12.5 × 10) mm, thermal response time ≤ 0.5s; (3) Recording display instrument: Can display the temperature rise behind the sample and the corresponding values of droplet number, time, frequency, etc.; the test temperature in the guide groove is > 250°C; the temperature rise on the sample's backside is > 40K, and an alarm is triggered when the temperature rise reaches 40K; (4) Accuracy: Resolution ≤ ±0.5K, the temperature display and alarm function test error ≤ ±0.4K; (4) Structure and installation: The temperature sensor can be connected through the wires near the center of the groove, and the sensor support is fixed on the sample frame by four bolts. The sensor is embedded in the groove of the sensor support with heat-resistant adhesive, and the protruding part is (0.5 ± 0.2) mm. 
4. Sample Frame 
(1) The sample clamping mechanism ensures that the sample is tightly attached to the sensor support block. 
(2) A pre-applied tension of (175 ± 5) g is applied to the sample. 
(3) The position of the sample can be adjusted in both the vertical and horizontal directions. 
5. The instrument is equipped with a dedicated computer, running the Windows operating system. It features a program operation interface, as well as automatic data recording and data analysis processing capabilities. 
6. Oxygen and acetylene gas should be provided by the user themselves or purchased locally. 
Applicable standards (different standards require different accessories)
GB/T 17599-1998 Protective Clothing Fabrics - Thermal Resistance Performance - Determination of Resistance to Impact from Molten Metal Droplets
GB 8965.2-2022 Protective Clothing - Welding Clothing 
AQ 6103-2007 Welder Protective Gloves 
GB 38306-2025  Hand Protection - Heat-Resistant Protective Gloves 
BS EN 348 Protective Clothing - Test Method: Determination Of Behaviour Of Materials On Impact Of Small Splashes Of Molten Metal
ISO9150:Protectiveclothing; Determination of material behavior under the impact of small splashes of molten metal - Test for protective clothing's performance against molten metal splashes