Detailed Explanation of Crane Parameters: Teach You To Understand Key Indicators Such As Rated Load And Working Range

Have you ever been completely confused by various technical parameters? How do rated load, working range and lifting height affect actual operation? This article will systematically analyze the core parameters of cranes, helping you quickly understand the performance of the equipment and avoid making mistakes when purchasing!

I. Analysis of Core Parameters of Cranes

Rated load (Lifting Capacity)

Definition: The maximum weight that a crane is allowed to lift under safe working conditions (unit: tons).

Key points:

It is not a fixed value: The actual load will vary with the working amplitude (the greater the amplitude, the smaller the allowable load).

Safety factor: Generally 1.25 to 1.5 (if marked as 8 tons, the actual structure can bear 10 to 12 tons).

Pitfall avoidance tips

The actual capacity under different amplitudes needs to be judged in combination with the Load Chart.

Dynamic loads (such as sudden lifting) may exceed the rated value, and a margin should be left.

2. Working Radius

Definition: The horizontal distance from the center of the hook to the rotation center of the crane (unit: meters).

Impact: The greater the amplitude, the lifting capacity drops exponentially (lever principle).

For instance, an 8-ton crane can lift 8 tons at a 5-meter range, but only 3 tons at a 10-meter range.

Purchasing suggestion: Select the arm length based on the actual working distance requirements to avoid "out of reach" or "waste of capacity".

3. Lifting Height

Definition: The vertical distance from the lowest point to the highest position of the hook.

Note: The height of the lifting gear should be taken into account (for example, rigging/container hangers will occupy part of the height).

When working outdoors, a safe distance should be reserved (to avoid touching power lines or buildings).

4. Lifting Speed (Hoisting Speed)

Definition: The lifting speed of the hook when it is unloaded/fully loaded (unit: m/min).

Application scenarios: High speed (20-30m/min) : Suitable for frequent loading and unloading (such as port containers).

Low speed (5-10m/min) : Precision hoisting (such as wind power equipment installation).

5. Working Class

Standard: Classified by ISO or FEM into grades A1 to A8 (the higher the number, the higher the intensity of use).

For example:

A3 (Light Type) : Occasionally used in warehouses (annual working hours <500 hours).

A6 (Medium-sized) : Frequent operations at the port (2,000 working hours per year).

A8 (Heavy) : Continuous high-intensity operations in metallurgy and other fields.

Advanced Parameters: A Must-read for Professional Users

1. Slewing Speed

It affects the operation efficiency, but if it is too fast, it may cause the goods to sway (an anti-sway system needs to be matched).

2. Outrigger Span

Determining stability is particularly crucial for mobile cranes.

3. Dead Weight

Lightweight design can reduce site requirements and influence transportation/installation costs.

 Guide to Avoiding Pitfalls When Purchasing

Common Misunderstandings

Only look at the rated load → Ignore the influence of amplitude on capacity.

Ignoring the work level → Selecting the wrong model leads to premature damage of the equipment.

Environmental restrictions were not taken into account → For instance, anti-freezing hydraulic oil is required in low temperatures, and anti-corrosion is needed in coastal areas.

Correct purchasing process

Clear requirements: maximum load, commonly used amplitude, working environment.

Request the load curve graph: Verify the capacity under actual working conditions.

Compare with similar products: Pay attention to the energy efficiency ratio (such as kW/ ton).

What parameter confusions have you encountered when choosing a crane?