Analysis of the lifting capacity and rotation radius of lever hoist

1、 Lifting Weight

Definition and Standards

The lifting capacity refers to the maximum load that a lever hoist can lift under safe conditions, usually measured in tons (t) or kilograms (kg). According to international standards (such as EN 13157) and domestic regulations (such as JB/T series), the rated lifting capacity should be designed with a safety factor (usually ≥ 1.2) to ensure that the actual load does not exceed 80% -90% of the rated value and avoid overload risks. For example, the Haklift VTT1500 series has a rated lifting capacity of 1.5 tons and can actually lift up to 1.8 tons (including lifting equipment), but a safety margin needs to be reserved.

influencing factors

Materials and Structure: High strength steel or aluminum alloy (such as HADEF aluminum hoist) is used to ensure strength through dynamic load testing (such as 1.5 times rated load verification). The chain has undergone pre tension testing and has a tensile strength of up to 20 tons.

Job types: divided into light level (JC=15%), medium level (JC=25%), heavy level (JC=40%), etc. High frequency operations require selecting high work levels (such as M5-M8) to avoid motor overheating or component wear.

Environmental conditions: Temperature range -40 ℃ to 50 ℃, corrosive environment requires anti-corrosion coating (such as powder coating) or stainless steel material; Explosion proof scenarios must comply with ExIIBT4 standards.

Typical Applications

Industrial field: equipment installation, bundling of loose parts (such as electricity, shipbuilding), with a lifting capacity ranging from 250kg to 9 tons.

Special scenario: Explosion proof models are used for oil and gas, and hand cranked hoists are suitable for places without electricity.

2、 Rotation radius

Definition and Function

The rotation radius refers to the range within which the lever hoist can rotate during operation, or the rotational ability of the hook/load chain. For example, the rotating hook design allows for automatic opening instead of breaking when overloaded, enhancing operational flexibility. Some models are equipped with swivel rings (such as Haklift VTS series), which support 360 ° rotation and are suitable for non-linear traction or narrow space operations.

influencing factors

Structural design: Compact design (such as aluminum shell weighing only 3-5kg) reduces the rotation radius and improves portability; Long arm rods need to consider torque balance, and the lifting capacity should decrease correspondingly when the rotation radius increases (inverse relationship).

Operation scenario: Small rotation radius is required for narrow spaces such as indoor decoration and warehouse stacking; Large scale infrastructure projects (such as steel structure hoisting) require a large rotation radius to adapt to the span.

Safety device: upper and lower limit switches, brake (dual brake claws+4 spring design) to ensure stable load during rotation and prevent impact or falling objects.

Typical Applications

Construction site: Hoisting of precast concrete components, adapting rotation radius to component size and space constraints.

Logistics warehousing: loading and unloading at the dock, stacking, and the rotation radius needs to match the shelf layout and transportation path.

3、 The relationship between lifting capacity and rotation radius

Principles of Mechanics

According to the lever balance condition (F1 × L1=F2 × L2), as the rotation radius increases, the extension of the lever arm leads to an increase in torque, and the lifting capacity needs to be reduced to maintain structural stability. For example, when the length of the arm remains constant, the turning radius is inversely proportional to the lifting capacity - a 10% increase in radius may result in a 15% -20% decrease in maximum lifting capacity, ensuring the safety of the equipment during operation.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment