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A cabestrillo de correas 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, obra pintada, 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. Cóntanos o que se está levantando, the figure you need and how it will be hitched — vertical, basket or choked — and we will confirm the width, a lonxitude, 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. A cabestrillo de correas 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: ancho, figure and ends
- Anchura — 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, revestido ou acabado. It also sets what the band can be folded into.
- Figura, 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 “a tonelaxe” alone is the single most common error in this category.
- Remata — 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. O ángulo é o ángulo da perna coa vertical, e a etiqueta do artigo sempre anula a táboa.
| Arranxo | Factor de modo | O que significa no chan |
|---|---|---|
| Vertical | 1.0 | Unha perna, recto cara arriba. A banda colga e leva. |
| Sufocado | 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. |
| Cesta, 0-45° | 2.0 | Banda baixo a carga, os dous extremos no gancho, pernas preto da vertical. |
| Cesta, 45-60° | 1.4 | Cesto coas pernas abertas; a capacidade de custos de propagación. |
| Dúas pernas, 0-45° | 1.4 | Dúas bandas para un gancho, pernas preto da vertical, carga compartida. |
| Dúas pernas, 45-60° | 1.0 | O mesmo par coas pernas separadas - a mesma perda de capacidade. |
| Three and four legs, 0-45° | 2.1 | Tres ou catro patas; 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, polo que unha carga que debe ser atragantada necesita unha banda máis grande en lugar dunha máis longa. E a medida que se espallan as pernas a capacidade cae, 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, e por nada máis.
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 violeta, 2 t verde, 3 t amarelo, 4 t gris, 5 t vermello, 6 t marrón, 8 t azul, 10 t laranxa. 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 | Eslinga de cinta | Eslinga de cable de arame |
|---|---|---|
| Finished or painted surface | The reason to choose it: wide soft contact, sen marca. | Marks and scuffs the surface; needs padding to compete. |
| Weight to be handled | A fraction of a rope of the same figure. | Pesado, 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 | Estas fibras teñen un límite de traballo ao redor 100 °C and fail by melting, not by deforming politely. | Far more tolerant, though not unlimited. |
| Abrasión, grana, 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.
Levantamento, 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.
| Deber | How the band is loaded | What it has to be rated for | What must never happen |
|---|---|---|---|
| Levantamento | Brevemente, visiblemente, 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 / contención | Continuamente, en tensión, en tránsito, desatendido, with fatigue and vibration. | A restraint rating — a lashing capacity, tensioned by a ratchet or a buckle, not a lifting rating. | 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, e a ratchet cargo lashing belt ou ratchet tie down strap that restrains. It costs less than the incident.
Bordes, sleeves and the protection that is part of the specification
Unha banda cortada por un bordo comeza como unha pequena muesca e remata como un fallo, so edge protection is a specification line rather than an accessory decision. Onde a carga ten unha esquina afiada, un labio mecanizado, unha rebaba, unha salpicadura de soldadura ou unha pel de fundición áspera, ou ben a banda está enfundada e a manga é parte do artigo, or the corner is protected with a pad or a corner piece that travels with the band. Pídeo na fase de consulta: 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.
Inspección, and the conditions that end a band’s life
Inspeccionar antes de cada uso, e formalmente no intervalo establecido as regras do sitio. The conditions that remove a webbing sling from service are specific rather than a matter of judgement: acid or caustic burns, melting or charring, enganches, pinchazos, tears or cuts, broken or worn stitching, distortion of the fittings or the eyes, and a label that can no longer be read. Unha banda con calquera destes está fóra de servizo, and it is out of service because the damage is in the load path, not because it looks untidy. Store clean and dry, fóra da luz solar, and keep the record with the article.
Preguntas frecuentes
Can a webbing sling really replace a wire rope of the same capacity? For the lift itself, si, 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? Porque a banda está cargada contra si mesma e a envoltura agarra, so the fibres are working in a way the vertical figure does not describe. É normal, está na etiqueta, and it is the reason a choke sometimes needs the next size up.
Can I use one sling as a lashing as well? Non como o mesmo artigo. Restraint is rated for continuous tension, non para un ascensor, and the two duties are marked differently. Buy the lashing as a lashing.
How long will a band last? O medio ambiente decide, non o calendario: a band on painted steel in a workshop gives years, the same band dragged over concrete and grit gives shifts. Inspeccionar a condición en lugar da idade, 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, a banda está fóra de servizo.
Onde ir a continuación
Related categories and products: eslinga de elevación, eslinga de cable de arame, viga de elevación, gancho de elevación, lifting chain. For the neighbouring articles see nylon woven flat sling, polypropylene flat sling, heavy duty lifting sling, cabestrillo de correas sen fin, eye and eye type webbing sling, alkali resistant sling, lightweight UHMWPE endless loop flat webbing sling, flame resistant aramid webbing sling belt e Eslinga sen fin de un só uso.
Contacto
Lift Sling Rigging Co., Ltd: teléfono e WeChat 18066002268, correo electrónico 702461526@qq.com, Parque Industrial Lifute, Cidade de Taizhou, Provincia de Jiangsu, China. Código HS 630790. Envía a carga, a cifra por enganche, the arrangement and the working environment, e confirmaremos o ancho, a lonxitude, a protección e o marcado antes de tecer a banda.
ZH