How to choose a gantry crane?

Step 1: Define the Core Task (Answer: "What is the job?")

1. What are you lifting?

Question: What materials are you primarily handling?

Choices:

Unit loads (e.g., parts, molds, equipment) → Standard Hook.

Bulk materials (e.g., sand, grain, coal) → Grab Bucket.

Plates, steel sections → Electromagnetic Lifter or Specialized Lifting Attachments.

Containers → Container Spreaders.

Key Point: The weight of the lifting attachment MUST be included in the total lifting capacity! For example, to lift a 20-ton container with a 2-ton spreader, a crane with a minimum 22-ton capacity is required.

2. How much are you lifting?

Question: What is the maximum weight you need to lift in a single operation? (Be sure to include the attachment weight).

Action: Identify your single heaviest item and incorporate a 10%-20% safety margin to accommodate potentially heavier future loads. For example, for an 18-ton heaviest load, selecting a 20-ton or 25-ton crane is recommended.

3. How high and how far?

Question 1 (Height): To what height do the goods need to be lifted? For instance, just into a truck bed, or onto a three-story high storage rack?

Action: Measure from the ground to the highest stacking point, then add the height of the lifting attachment itself. This gives you the Lifting Height.

Question 2 (Span): How wide is your site? What horizontal area must the crane cover?

Action: Measure the width you want the crane rails to cover; this is the Span. Also consider: is loading/unloading required on both sides of the rails? If yes, then a double cantilever design should be selected.

Step 2: Evaluate the Site & Environment (Answer: "Where is the job?")

1. Site Conditions

Question: Is it an indoor workshop or an outdoor yard? Are the rails laid on the ground or on elevated supports?

Choices:

Indoor: Primarily consider building clearances and column locations.

Outdoor: Must prioritize wind resistance capabilities (rail clamps, anchor devices), and the impact of weather (temperature, humidity, corrosion).

Key Point: It is essential to have the supplier verify that your rail foundation can withstand the crane's maximum wheel load.

2. Environment & Regulations

Question: Does your industry have specific safety regulations? For example, in chemical plants (explosion-proof), food processing (hygiene requirements), or railway hubs (specific standards)?

Action: Inform the supplier of any such special requirements.

Step 3: Plan Operations & Budget (Answer: "How is the job done? What is the budget?")

1. Usage Frequency

Question: How many hours per day will this crane be used? Is it for occasional use, or almost continuous operation?

Choices (Corresponding to Duty Class):

Occasional Use (e.g., 1-2 hours/day, maintenance workshops) → A3 (Light Duty).

Moderate Use (e.g., single-shift, regular production) → A5 (Moderate Duty).

Frequent, Heavy-Duty Use (e.g., multiple shifts, busy yards, metallurgy) → A6/A7 (Heavy/Severe Duty).

Strong Recommendation: Where the budget allows, selecting a slightly higher duty class is one of the most cost-effective investments, as it significantly extends equipment lifespan and reduces downtime.

2. Operational Preference

Question: How do you prefer to operate the crane?

Choices:

Floor Pendant / Remote Control (Recommended for most cases): The operator carries the remote, offering excellent visibility, flexibility, and lower cost.

Operator's Cab: Suitable for very high lifting heights, extremely intensive work cycles, or situations requiring precise load positioning, providing a more comfortable operating environment.

Core Configuration Choice:

Control System: Variable-Frequency Drive (VFD) Control is virtually standard in modern cranes. It ensures smooth operation, minimizes impact on the load and machinery, enables precise positioning, and saves energy. It is strongly recommended to choose VFD control unless the budget is extremely limited.

3. Budget & Future Needs

Question: What is your budget? Is business volume expected to grow in the next 1-2 years?

Advice:

Don't just look at the initial price: Compare the crane's duty class and the brand/quality of its core components (motors, electrical controls, wire rope) comprehensively.

Invest for the future: Building some spare capacity into the lifting capacity and duty class is more economical than having to replace the entire equipment later.