First, safety net impact test machine principle:
The safety net impact resistance tester uses a dedicated test device to allow the test steel ball to freely fall into the test net from a prescribed height, and judge the impact resistance performance of the safety net according to its degree of damage.
Second, safety net impact tester test equipment:
1 , safety net impact tester test weights:
1.1 Steel balls with a smooth surface, a diameter of (500 ± 10) mm and a mass of (100 ± 1) kg.
1.2 Cylindrical sandbags with a diameter of (550 ± 10) mm and a height not exceeding 900 mm with a mass of (120 ± 1).
1.3 The factory inspection can use any of the above two kinds of test weights.
1.4 Type test, arbitration test, etc. Test ball should be used.
2 , safety net impact tester test hanger:
The test weight can be lifted and released in a defined position to allow it to fall freely.
3 , safety net impact testing machine testing framework :
Length 6m, width 3m, height from the ground 3m, using a rigid frame with a pipe diameter of not less than 50mm, a wall thickness of not less than 3mm firmly welded.
4 , safety net impact tester test sample:
Size or size is 6m×3m flat net or vertical net, or complete compact net that can be sold, used or in use.
5 , safety net impact resistance test method:
5.1 Test height (the distance between the bottom of the test object and the initial sagging bottom of the test net is the test height): flat net is 7m, vertical net is 2m, class A dense net is 1.8m, class B compact net is 1.2m.
5.2 The impact point shall be the geometric center of the sample.
6 , safety net impact tester test steps:
6.1 The test sample is firmly tied to the test frame;
6.2 Make the distance between the bottom surface and the sample net installation plane plus the initial sagging of the sample net equal to the test height, then release the test weight to make it fall freely;
6.3 Observe the condition of the sample.
7. Evaluation of test results of safety net impact tester:
Ping (Li) network assessment: Test network net rope, side rope, tether is not broken, the test weight does not touch the ground as qualified; otherwise is not qualified;
The dense mesh evaluation: A cross section (200 x 50) mm cube cannot pass through the torn hole as a test pass. The test results are based on the weight before the test weight is lifted. The cube should not exert significant external force when it passes through the tear cavity.
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