Blocuri cu lanț, cunoscut și sub denumirea de blocuri de scripete cu lanț, are a type of lifting device that uses a chain to raise and lower loads. They provide mechanical advantage through a system of pulleys. When selecting and using chain blocks, it is important to consider the working load limits and safety factors to ensure safe and efficient lifting.
What Is A Safety Factor?
A chain hoist safety factor is the ratio of breaking strength to working load limit. It indicates the block’s maximum load capacity relative to its forces under normal operation. Safety factors are incorporated into chain block design to account for dynamic loads, forte de impact, wear and other unforeseen stresses.
Factorii de siguranță tipici pentru blocurile de lanț variază de la 3 la 5. This means the block has 3 la 5 ori mai mare decât capacitatea pentru care este nominalizat în condiții normale de utilizare. Organismele de reglementare precum OSHA necesită un factor minim de siguranță de 5 for most general purpose lifting equipment. in orice caz, specialized chain blocks can have lower safety factors depending on the application, ca bloc de scripete cu lanț 20 tonă.
Chain Working Load Limit (WLL)
Limita sarcinii de lucru (WLL) refers to the maximum load a chain block is as designed to safely lift under normal operation. The WLL takes into account the safety factor incorporated into the block’s design and components. Blocurile cu lanț sunt de obicei evaluate cu un WLL specific care este semnificativ mai mic decât rezistența lor finală la rupere.
Under normal usage, the sum of all loads acting on a chain block should not exceed its stated WLL. Supraîncărcarea blocurilor de lanț crește riscul de defectare a componentelor și eliberarea accidentală a sarcinii. Consultați întotdeauna marcajul WLL sau plăcuța cu date atunci când selectați blocul de lanț de dimensiune adecvată pentru o anumită sarcină de ridicare.
Factors That Impact Safety
Ca profesionist producatori de palanuri, we are very responsible to tell you that there are several factors that affect the safety factor and WLL of the chain block:
- Pulley Size & Number – More/larger pulleys provide higher mechanical advantage but lower load capacity.
- Gradul de lanț – Higher grade chain with greater breaking strength allows for higher WLLs.
- Calitatea componentelor – Better material and construction techniques increase rated capacities.
- Certificari – Certified chain blocks by reputable standards organizations provide a defined WLL.
- Aplicație – Specialized blocks for severe service have lower safety factors for cost efficiency.
Overview For The Safety Factors Of Chain Blocks
The safety factor and working load limit of chain blocks indicate their rated lifting capacity relative to their actual breaking strength. Safety factors of 3 la 5 times are common for general purpose chain blocks, providing a buffer for unforeseen loads and stresses.