bsen818-7-20xx升降用的短节链条安全链式吊索精密公差吊链、等级t(类型t、—at和—t

bsen818-7-20xx升降用的短节链条安全链式吊索精密公差吊链、等级t(类型t、—at和—t内容摘要：

afety of machinery – Basic concepts – General principles for design – Part 2: Technical principles and specifications. EN 8181:1996, Short link chain for lifting purposes – Safety – Part 1: General conditions of acceptance. EN 1050:1996, Safety of machinery – Principles for risk assessment. EN ISO 75001, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/pression testing machines (ISO 75001:1999). EN 10025, Hot rolled products of nonalloy structural steels。 technical delivery conditions (includes amendment A1:1993). ISO 643, Steels – Micrographic determination of the ferritic or austenitic grain size. ISO 43011, Cranes and lifting appliances – Classification – Part 1: General. ISO 65071, Metallic materials – Vickers hardness test – Part 1: Test method. ISO 4965, Axial load fatigue testing machines Dynamic force calibration Strain gauge technique. 3 Terms and definitions For the purposes of this European Standard the terms, definitions and symbols given in EN 8181 apply. EN 8187:2020 (E) 6 4 Hazards The release of a load due to failure of hoist chain puts at risk either directly or indirectly the safety or health of those persons within the danger zone of lifting equipment. In order to provide the necessary strength and durability of hoist chain, this European Standard lays down requirements for the design, selection of materials of construction and testing to ensure that specified levels of performance are met. Fatigue failure has not been identified as a hazard for type T chain when hoist chain selected according to annex B and having the specified levels of performance and design given in this European Standard is used in serial hoists. Fatigue failure has been identified as a hazard for hoist chains types DAT and DT used in power driven hoists. Therefore this European Standard specifies levels of design and performance, with particular reference to fatigue resistance. Since failure can be caused by the incorrect choice of grades and specification of lifting hoist chain this European Standard also gives the requirements for marking and the manufacturers certificate. Dimensional inpatibility between the hoist chain and mating parts of the hoist (chain wheel, chain guide and loading device) may lead to premature failure and this European Standard contains dimensional requirements for correct assembly and fit. Table 1 lists those hazards, which require action to reduce risk identified by risk assessment as being specific and significant for hoist chain of Grade T Types T, DAT, DT. Table 1 — Hazards and associated requirements Hazards identified in annex A of EN 1050:1996 Relevant clause of annex A of EN 2922:1991/A1:1995 Relevant clause/subclause of this standard Mechanical hazard due to inadequacy of strength } } } } } 5 6 7 (Types DAT, DT only) Fatigue failure and EN 8187:2020 (E) 7 5 Safety requirements General The hoist chains shall conform to the requirements of EN 8181. Dimensions General A selection of nominal sizes and dimensions is given in and . Other nominal sizes may be used, provided that nominal sizes shall not exceed the range specified in and that the dimensions and tolerances are calculated in accordance with annex A. Whilst the nominal link pitch pn is based upon 3 dn (where dn is the nominal size of the hoist chains) this may be varied but shall not exceed the limits 2,6 dn to 3,2 dn. The nominal link pitch pn shall be subject to the tolerances specified in annex A. NOTE Compatibility between the hoist chain and the mating parts of the hoist requires agreement on the nominal size and dimensions and on the distribution of tolerances between the chain manufacturer and the hoist manufacturer. Nominal size dn The nominal size shall not be below 4 mm or above 22 mm, a selection of nominal sizes is listed in Table 2. Tolerances on material diameter The tolerances on material diameter for the selected nominal sizes shall be as listed in Table 2. These and all other nominal size material diameter tolerances shall be calculated in accordance with . Pitch and widths The dimensions and tolerances of the 3 dn pitch and the width for the selected nominal sizes shall be as listed in Table 2. The dimensions and tolerances of the pitch and width shall be calculated in accordance with . These dimensions and tolerances and all other nominal size and pitch ranges and tolerances of multiple pitch lengths, shall be calculated in accordance with . The tolerances of multiple pitch lengths shall be calculated in accordance with . EN 8187:2020 (E) 8 Table 2 — Selected dimensions Dimensions in millimetres Pitch Width Gauge length of 11 x pn Weld diameter ds max. Nominal size dn Material diameter tolerance pn tolerance1 internal w3 min. external w2 max. tolerance1) 4 177。 0,2 12 0,25 4,8 13,6 132 0,6 4,3 5 177。 0,2 15 0,3 6,0 17,0 165 0,8 5,4 6 177。 0,2 18 0,35 7,2 20,4 198 1,0 6,5 7 177。 0,3 21 0,4 8,4 23,8 231 1,1 7,6 8 177。 0,3 24 0,5 9,6 27,2 264 1,3 8,6 9 177。 0,4 27 0,5 10,8 30,6 297 1,4 9,7 10 177。 0,4 30 0,6 12,0 34,0 330 1,6 10,8 11 177。 0,4 33 0,6 13,2 37,4 363 1,7 11,9 12 177。 0,5 36 0,7 14,4 40,8 396 1,9 13,0 13 177。 0,5 39 0,8 15,6 44,2 429 2,1 14,0 14 177。 0,6 42 0,8 16,8 47,6 462 2,2 15,1 16 177。 0,6 48 0,9 19,2 54,4 528 2,5 17,3 18 177。 0,9 54 1,0 21,6 61,2 594 2,9 19,4 20 177。 1,0 60 1,2 24,0 68,0 660 3,2 21,6 22 177。 1,1 66 1,3 26,4 74,8 726 3,5 23,8 1) These tolerances are usually divided into + 2/3 and – 1/3 for both the individual link and the s。