一、吊装带吨位规格划分

　　常规标准涤纶吊装带标准化吨位覆盖 1t、2t、3t、4t、5t、6t、8t、10t、12t、15t、20t、25t、30t、40t、50t;针对大型设备、重型构件吊装场景，还可定制超大规格产品，承载能力甚至可达千吨级别。

　　所有标注吨位均为额定工作载荷，代表吊带平稳作业时允许承载的标准重量，现场吊运工件实际重量严禁超出该额定数值。

　　二、安全系数区分说明

　　依据国内起重行业国标硬性要求，吊装带成品出厂安全系数标准为 6 倍;部分客户为控制采购成本，会选用 4 倍、5 倍安全系数的经济型吊带，对应产品售价会更低。

　　需区分两个易混淆概念：安全系数≠工况使用折算系数。安全系数是产品本身材质、编织工艺自带的安全储备;工况折算系数是受吊挂方式、吊带倾斜角度影响，实际可用承载能力的修正比例，吊带产品铭牌除标注四种基础吊挂形式外，还有细分工况的官方折算标准。

　　三、六大主流吊装工况及载荷折算系数

　　1. 结套捆绑吊装

　　操作方式：将吊带一端环眼穿过另一端环眼，形成锁套箍紧圆筒类、圆形工件，多用于管道、钢辊等圆柱形物料捆吊。

　　折算系数 0.8.承载能力折减：以 2 吨标准吊带为例，实际允许吊运重量 = 2吨 ×0.8=1.6 吨，工件自重不得超过 1.6 吨。

　　2. 垂直单点直吊

　　操作方式：吊带两端环眼分别挂装起重吊钩与工件吊装孔，吊带整体竖直无倾斜，是简单通用的吊挂形式。

　　折算系数 1.0.无承载损耗：吊带标注额定吨位即为实际可承载重量。

　　3. 双点平衡梁吊篮吊装(工况一)

　　操作方式：搭配平衡吊梁使用，吊带两端吊点完全垂直地面，双吊带均分荷载。

　　折算系数 2.0.承载能力翻倍：2 吨吊带实际可安全起吊 4 吨重物。

　　4. 单点吊篮斜吊(异形工件专用)

　　操作方式：仅单处顶部吊点，两条吊带分叉兜吊不规则构件，承载能力由吊带与地面夹角决定：

　　吊带竖直夹角 0°～45°：折算系数 1.4，2 吨吊带承重 2.8 吨;

　　吊带竖直夹角 45°～60°：折算系数 1.0，2 吨吊带仅可承载 2 吨工件;

　　实操技巧：同等吊点间距下，选用更长吊带可减小倾斜角度，提升实际可用载荷。

　　5. 双肢分叉成套吊装

　　操作方式：单吊钩同时挂两条吊带环眼，双吊带呈 V 型分叉起吊工件，荷载均分至两条吊带。

　　承载折算规则同上，由吊带倾斜角度决定：

　　0°～45° 夹角：折算系数 1.4.单根 2 吨吊带可分担 2.8 吨荷载;

　　45°～60° 夹角：折算系数 1.0.单根 2 吨吊带仅承载 2 吨;

　　加长吊带能够收窄倾斜角度，可提升整体吊装承载力。

　　6. 三肢 / 四肢成套吊索吊装

　　操作方式：吊钩搭配吊钩、子母环、蝴蝶扣等连接 3 根或 4 根吊带，多肢均匀分摊重量，保障重型大件吊装平稳不偏载，是大型设备主流吊具组合。

　　角度对应折算系数更高：

　　吊带夹角 0°～45°：折算系数 2.1.单根 2 吨吊带可分担 4.2 吨荷载;

　　吊带夹角 45°～60°：折算系数 1.5.单根 2 吨吊带可分担 3 吨荷载。

　　I. Classification of Webbing Sling Tonnage Specifications

　　Standard polyester webbing slings are manufactured in standard tonnages: 1t, 2t, 3t, 4t, 5t, 6t, 8t, 10t, 12t, 15t, 20t, 25t, 30t, 40t and 50t. Extra-large custom webbing slings with load capacities up to thousands of tons are available for lifting heavy-duty equipment and large structural components.

　　All marked tonnages refer to the Working Load Limit (WLL), the maximum safe weight permitted under steady lifting operations. The actual weight of workpieces on site must never exceed this rated value.

　　II. Explanation of Safety Factor Classification

　　In accordance with mandatory national standards for the lifting industry in China, finished webbing slings shall be produced with a minimum safety factor of 6. For cost control purposes, some customers opt for economical slings with safety factors of 4 or 5. which are offered at lower prices.

　　Two easily confused terms must be distinguished: safety factor ≠ service conversion factor for lifting conditions. The safety factor is the inherent safety margin derived from the sling’s raw material and weaving technology. The service conversion factor is a correction coefficient for the actual usable load capacity, determined by lifting methods and sling inclination angles. Apart from four basic lifting configurations printed on sling labels, official conversion standards covering detailed working conditions are also specified.

　　III. Six Main Lifting Configurations and Corresponding Load Conversion Factors

　　1. Choker Hitch Lifting

　　Operation: Thread one eye of the webbing sling through the other to form a locking choker for clamping cylindrical workpieces, widely used for hoisting pipes, steel rollers and other cylindrical materials. Conversion factor: 0.8 (load capacity reduction). Example: A 2t standard webbing sling allows a maximum lifting weight of 2t × 0.8 = 1.6t. The self-weight of the workpiece shall not exceed 1.6 tons.

　　2. Vertical Single-Point Straight Lifting

　　Operation: Attach the two eyes of the webbing sling separately to the lifting hook and the lifting lug of the workpiece, with the sling kept fully vertical without inclination. This is a simple and universal lifting method. Conversion factor: 1.0 (no load loss). The marked rated tonnage of the sling equals its actual allowable load capacity.

　　3. Two-Point Spreader Beam Basket Hitch (Configuration 1)

　　Operation: Used with a spreader beam. Both lifting points of the slings are perfectly perpendicular to the ground, with the load evenly shared by two slings. Conversion factor: 2.0 (load capacity doubled). A 2t webbing sling can safely lift loads up to 4 tons.

　　4. Single-Point Angled Basket Hitch (For Irregular Workpieces)

　　Operation: Only one top lifting point is adopted; two slings are spread out to cradle irregular components. The load capacity depends on the angle between the sling and the vertical line:

　　Vertical sling angle 0° ~ 45°: conversion factor 1.4; a 2t sling can bear 2.8 tons

　　Vertical sling angle 45° ~ 60°: conversion factor 1.0; a 2t sling can only bear 2 tons

　　Practical tip: With a fixed span between lifting points, longer slings reduce the inclination angle and increase the actual usable load capacity.

　　5. Two-Leg Spreader Lifting

　　Operation: Attach two sling eyes to a single hook, forming a V-shaped spread to lift workpieces, with the load equally distributed on both slings. The load conversion rules are identical to the above and governed by sling inclination angles:

　　Angle 0° ~ 45°: conversion factor 1.4; each 2t sling can support a partial load of 2.8 tons

　　Angle 45° ~ 60°: conversion factor 1.0; each 2t sling bears a partial load of 2 tons

　　Extending sling length narrows the inclination angle and improves overall lifting capacity.

　　6. Three-Leg / Four-Leg Spreader Lifting

　　Operation: Connect 3 or 4 webbing slings to the hook via master links, sub-links or connecting shackles. Multiple sling legs distribute weight uniformly to ensure stable lifting without unbalanced load, making this the mainstream rigging combination for large-scale equipment. Higher conversion factors apply based on sling angles:

　　Sling angle 0° ~ 45°: conversion factor 2.1; each 2t sling can bear a partial load of 4.2 tons

　　Sling angle 45° ~ 60°: conversion factor 1.5; each 2t sling can bear a partial load of 3 tons

　　Key Uniform Terminology

　　Webbing Sling 吊装带

　　Working Load Limit (WLL) 额定工作载荷

　　Safety Factor 安全系数

　　Conversion Factor 折算系数

　　Choker Hitch 结套捆绑吊装

　　Vertical Lifting 垂直吊装

　　Basket Hitch 吊篮式吊装

　　Master Link / Sub-Link 子母环

　　Spreader Beam 平衡梁

　　Lifting Configuration 吊装工况