Wire and cable heat-resistant impact testing machine

KTR016Wire and cable heat-resistant impact testing machine

Complies with 5.9 of the GB/T32129-2015 standard for halogen-free low smoke flame-retardant cable materials for wires and cables (Appendix A Thermal Shock Test Method)

1wire and cableHeat shock resistance testmachineMain technical parameters

1. Sample size: approximately 127mm in length, 6.0 ± 0.1mm in width, and 3.0 ± 0.1mm in thickness

2. Test bar: diameter 6mm, 4 sets (approximately 300mm in length),

3. Equipped with a strong clamping head,

4. Test bracket: 1 set

5. Winding bracket: 1 set

6. Sample fixture: 1 set

7. The material of the bracket and fixture is stainless steel

8. Equipped with 3 2kg weights and 1 1kg weight

9. One 127mm x 6mm punching knife

IIwire and cableHeat shock resistance testmachineThe experimental method

1. Prepare three samples, each approximately 127mm long, (6.0 ± 0.1) mm wide, and (3.0 ± 0.1) mm thick.

2. The prepared sample shall be placed in an environment with a temperature of (23 ± 2) ℃ and a relative humidity of 45% to 55% for no less than 4 hours.

3. Fix the leftmost fixing clip to a position about 40mm away from the left end of the metal round rod for easy installation and removal of the metal round rod onto the rack. Then insert the left end of the metal round rod into the left fixing block above the "winding test bracket", and then insert the right end into the fixing port of the right fixing block and tighten the fixing screw. Note that the left fixing screw should not be tightened (just touch the metal round rod with the screw).

4. Fix one end of the sample with the leftmost clamp, and clamp the other end with a strong clamp and hang a weight. Rotate the handwheel to tightly wrap the sample around the metal round rod for 6 turns, and fix the other end with a fixing clip under load conditions, then remove the weight. The sample winding method and the wound sample are shown in the figure.

5. Repeat step 4 and install 3 specimens, ensuring that the head clamps of specimens 2 and 3 are tightly secured to the tail clamps of specimens 1 and 2.

6. First pull out the right end of the metal round rod, then pull out the left end. Remove the metal round rod from the rack and place it on the "heat-resistant test bracket".

7. Repeat the above steps to wind the samples of the other three metal round bars.

Note: When installing the sample, the degree of fixation of the fixing clip on the sample should be moderate to ensure that the sample does not loosen. If it is too loose, it may cause the sample to loosen, and if it is too tight, it may cause the sample to crack at the clamp.

8. Place the "heat-resistant test bracket" with the sample and metal round rod in an oven preheated to the specified temperature and hold for 1 hour, then remove and cool to room temperature.

III

wire and cableThermal shock test deviceDetermination of experimental results

When examined with normal or corrected vision without a magnifying glass, the specimen should be free of cracks.