一 繩索吊帶 is a flat band woven from high-strength synthetic fibre, with an eye or a loop formed at each end, used in place of a wire rope wherever the load must not be marked. The band is wide and flat, so the same load is carried over a large area instead of on a point: that is the whole reason this article exists, and it is why it is the first choice on machined faces, 畫咗嘅作品, coated tube, polished sheet and anything already finished before it is lifted.
Handling it is part of the argument too. It weighs a fraction of a wire rope of the same figure, it does not kink or develop meat hooks, and it cannot cut a hand. 話畀我哋知有啲咩被解除緊, the figure you need and how it will be hitched — vertical, basket or choked — and we will confirm the width, 長度, the end configuration and the marking before the band is woven.
What it replaced, and why it won on finished work
A wire rope sling is stronger per millimetre of its own thickness and it survives abuse that would end a webbing sling’s life. So the swap is not a question of strength; it is a question of contact and handling. A steel rope presents a hard, narrow surface to the load and a fringe of broken wires to the hands that rig it, and on a finished article it does the damage before the lift begins. 一 繩索吊帶 presents a wide soft face to the load and a smooth one to the rigger, so it is chosen where the surface is worth more than the extra care a rope would need, and where the load is not so abrasive or so hot that the fibre is out of its depth.
Three things the name has to carry: 闊度, figure and ends
- 闊度 — sets the pressure on the load. A narrow band concentrates the load and is the right answer on a light, stiff article; a wide band spreads it and is the right answer on anything soft, 涂咗或者完成咗. It also sets what the band can be folded into.
- 數字, per mode — a webbing sling does not have one capacity. It has a capacity in vertical, a different one in basket and a lower one choked, and the label states each of them. Purchasing on “噸位” alone is the single most common error in this category.
- 結束 — flat loop, folded eye or reinforced eye; they decide how the band sits on a hook, whether it can be used in a choker, and how the last of the fibres at the end are protected. The end is where a band wears out first, so it is worth specifying deliberately rather than accepting by default.
One band, several figures: the arrangement decides the rating
The figures below are the standard mode factors used across the market for flat webbing slings: each is multiplied by the sling’s own marked working load limit to give the capacity in that arrangement. 角度係腳同垂直線嘅角度, 同埋文章上面嘅標籤永遠會覆寫表格.
| 安排 | 模式因素 | 喺地板上面嘅意思 |
|---|---|---|
| 垂直 | 1.0 | 一隻腳, 直上. 樂隊掛住同攜帶. |
| 窒咗 | 0.8 | The band goes round the load and back through its own eye. The wrap grips the load, and the band is loaded against itself. |
| 籃子, 0–45 ° | 2.0 | 喺負荷下帶, 兩端都喺鉤上面, 腳接近垂直. |
| 籃子, 45–60 ° | 1.4 | 雙腿張開嘅籃子; 差價成本容量. |
| 兩隻腳, 0–45 ° | 1.4 | 兩條帶去一個鉤, 腳接近垂直, 負載共享. |
| 兩隻腳, 45–60 ° | 1.0 | 同一對雙腿張開 — 同樣嘅容量損失. |
| Three and four legs, 0–45 ° | 2.1 | 三、四隻腳; note it is not three or four times the figure, because the load rarely shares evenly. |
| Three and four legs, 45–60 ° | 1.5 | The same arrangement spread. Re-check rather than assume. |
Two consequences worth stating plainly. A choked webbing sling is weaker than the same sling used vertically, 所以一個一定要窒息嘅負荷需要一條大啲嘅波段，而唔係一條長啲嘅波段. 而隨住雙腳伸開，容量就會下降, which is a geometric fact rather than a material one — it is answered by a wider angle-free arrangement, by a spreader, or by a bigger sling, 同埋冇其他嘢.
Colour on the band is identification, not certification
Flat webbing slings are colour-coded by working load limit under the convention most of the market uses — 1 t 紫色, 2 t 綠色, 3 t 黃色, 4 t 灰色, 5 t 紅色, 6 t 啡色, 8 t 藍色, 10 t 橙色. It is genuinely useful on a site: a rigger can spot a two-tonne band in a pile from across the yard. What the colour cannot do is replace the label, because the figure that applies is the one printed and affixed to that individual sling, and above the top of the coded range there is no colour to read at all. Treat the colour as the fast check and the label as the answer.
Replacing a wire rope: where the swap works and where it does not
| The condition | 繩索吊帶 | 鐵絲繩吊帶 |
|---|---|---|
| Finished or painted surface | The reason to choose it: wide soft contact, 冇標記. | Marks and scuffs the surface; needs padding to compete. |
| Weight to be handled | A fraction of a rope of the same figure. | 好重, stiff, and awkward above a certain size. |
| Sharp edges and burrs | Requires an edge protector or a sleeve, without exception. | Copes with much more, which is why it still owns the fabrication yard. |
| Hot surfaces and hot work | These fibres have a working limit around 100 °C and fail by melting, not by deforming politely. | Far more tolerant, though not unlimited. |
| 磨損, 粒粒, dragging over concrete | Wears quickly; the cover can be added but the band’s life is measured in shifts. | The better answer where the environment itself is the attack. |
| Chemical contact | Depends on the fibre; acids, caustics and some solvents are hostile to most of them. | Steel is indifferent to most of what destroys a band. |
The practical rule is that a webbing sling is chosen for the sake of the load, not for the sake of the sling, and the environment the band works in is the price of that choice. Where both a finished surface and an abrasive environment are present, the answer is normally a covered or sleeved band rather than a return to wire rope — but that is a decision to take with the supplier on the specific job, not a default.
升降緊, lashing and towing are three different duties
The same article is often bought for all three and should not be. They load the band differently and are rated differently, and the confusion is the reason this section exists.
| 責任 | How the band is loaded | 佢要評分嘅嘢 | What must never happen |
|---|---|---|---|
| 升降緊 | Briefly, visibly, with a person watching and a standing load. | A lifting rating, stated per hitch and per angle, with the marking that goes with it. | A band bought for restraint used to lift. |
| Lashing / 克制 | Continuously, in tension, in transit, unattended, with fatigue and vibration. | A restraint rating — a lashing capacity, tensioned by a ratchet or a buckle, 唔係一個提升評分. | A lifting sling used as a lashing, or a lashing used as a sling. The duties do not transfer. |
| Towing and recovery | In snatch loads: repeated shock, far above the steady figure, plus elastic recoil if anything parts. | A purpose-made tow or recovery strap, built for shock loading, with its own rating and its own safe practice. | A lifting sling, or even a plain lashing, used as a tow rope. This is a fatal-practice, not a marginal one. |
Where a load has to be both lifted and held in transit, the correct answer is two articles rather than one used twice: a sling that lifts, 同埋一個 ratchet cargo lashing belt 或者 ratchet tie down strap that restrains. It costs less than the incident.
邊緣, sleeves and the protection that is part of the specification
由邊緣切開嘅帶由一個細嘅凹口開始，到一個失敗結束, so edge protection is a specification line rather than an accessory decision. 負荷有個鋒利嘅角落嘅地方, 一個加工過嘅唇, 一個毛刺, a weld spatter or a rough casting skin, 一係條帶係有袖，而袖係文章嘅一部分, or the corner is protected with a pad or a corner piece that travels with the band. Ask for it at the enquiry stage: a sleeve added later cannot be retro-fitted to a band already woven, and a band ordered without one is a band that will be used without one.
檢查, and the conditions that end a band’s life
每次使用前都要檢查一下, 同埋正式喺網站規則設定嘅間隔. The conditions that remove a webbing sling from service are specific rather than a matter of judgement: acid or caustic burns, melting or charring, 障礙, 穿刺, tears or cuts, broken or worn stitching, distortion of the fittings or the eyes, and a label that can no longer be read. A band with any of those is out of service, and it is out of service because the damage is in the load path, not because it looks untidy. 儲存乾淨同乾燥, 冇陽光, and keep the record with the article.
經常問
Can a webbing sling really replace a wire rope of the same capacity? For the lift itself, 係, provided the figure is taken per hitch and the edges and the temperature are within the band’s limits. The two are not interchangeable in the environment, which is a different question from the load.
What width should I order? The narrowest width that will carry the figure without crushing the load, or the widest the load’s geometry will accept. Send the load and the figure, and the width follows.
Why is the choked figure lower? 因為條帶係對住佢自己同埋個包裹握把, so the fibres are working in a way the vertical figure does not describe. 係正常嘅, 佢喺標籤上面, and it is the reason a choke sometimes needs the next size up.
Can I use one sling as a lashing as well? 唔係同一篇文章. Restraint is rated for continuous tension, not for a lift, and the two duties are marked differently. Buy the lashing as a lashing.
How long will a band last? 環境決定, 唔係日曆: a band on painted steel in a workshop gives years, the same band dragged over concrete and grit gives shifts. 檢查狀況而唔係年齡, and never against a fixed service life.
Does the colour tell me the capacity? It identifies the working load limit by convention, and it is not a substitute for the label. Where the colour and the label disagree, or the label is unreadable, 個樂隊停用咗.
下次去邊
Related categories and products: 抬起吊帶, 鐵絲繩吊帶, 升降梁, 升降鉤, lifting chain. For the neighbouring articles see nylon woven flat sling, polypropylene flat sling, heavy duty lifting sling, 無窮無盡嘅繩索吊帶, eye and eye type webbing sling, alkali resistant sling, lightweight UHMWPE endless loop flat webbing sling, flame resistant aramid webbing sling belt 同 單次使用無窮無盡嘅繩索吊帶.
聯絡
升降吊索索具公司, 有限公司 — 電話同微信 18066002268, 電郵 702461526@ qq . com, 升降工業園, 泰州市, 江蘇省, 中國. HS 代碼 630790. 傳送負載, 每條拖車嘅數字, the arrangement and the working environment, 我哋會確認闊度, 長度, the protection and the marking before the band is woven.
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