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Safety nets are special labor protection articles involving state property and personal safety. The quality of their products must be certified by the state-designated supervision and inspection department after they have passed the safety net test equipment and obtained a safety production license. Each shipment of safety nets must be inspected by the supervision and inspection department. Each safety net shall be attached to the national supervision department inspection certificate and enterprise self-certification certificate at different locations. At the same time, there should be signs, and there should be permanent signs on the signs. The contents of the signs should include: name of the manufacturer, date of manufacture, batch number, material, specifications, weight and production license number.
The safety net is classified into flat net (P), vertical net (L), and dense-listed safety net (ML). The safety net is mainly composed of side ropes, tethers, ribs, and net ropes. The dense mesh safety net consists of a net body, a buckle, a side rope and an additional tether. The physical and mechanical properties of safety nets are the main indicators for judging the quality of safety nets. Its content includes: edge rope, tether, net rope, rib rope breaking strength. The dense-mesh safety nets mainly include: breaking strength, elongation at break, tensile strength of joints, tearing strength, penetration resistance, retention of breaking strength after aging, and strong tail-flame-retardant properties of eye-opening buckles. Both flat net and vertical net should have impact resistance. Liteng can not replace flat nets. It should be based on the construction needs and load height to distinguish between flat nets and grids. Flat network load strength requirements greater than the vertical network, more materials used, weight greater than the vertical network. Under normal circumstances, the flat net is larger than 5.5kg, and the vertical net is larger than 2.5kg.
Safety nets mainly use open-air workplaces. Therefore, it must have weather resistance. Weather-resistant materials include nylon, vinylon and polyester. The same material used in the same net should be the same, its wet and dry strength ratio should be greater than 75%, and the total weight of each net should not exceed 15kg. The flame-retardant safety net's continued burning and smoldering time must not exceed 4s.
The width of the flat net is not less than 3m, and the width of the vertical net and dense-mesh safety net is not less than 12m. The length of the tether is not less than 0.8m. Safety net tether and tether spacing should not exceed 0.75m. The distance between the dense-mesh safety net tether and the tether should not be greater than 0.45m, and the distance between the safety net ropes should not be too small, and it is generally specified to be more than 0.3m. Safety nets can be divided into hand-knotted and mechanically-knotted. Mechanical knitting can be divided into knotted and knotless knots. In general, knot-free nodule intensity is higher than that of knotted knots. Net knots and knots must be firmly fixed and must not be moved to avoid enlargement of the mesh and non-uniformity of the length of the edges. The above situation will lead to stress concentration, until the net rope breaks.
Quality Inspection of Safety Nets by Safety Network Testing Equipment
Safety net inspection equipment safety network quality inspection article from Qingdao Zhongbang Instrument Co., Ltd.