Practical Decision-Making Approach Based on the Workstation Environment

In many factories, the process of purchasing a jib crane often goes like this: Procurement receives a request, checks the budget, finds a manufacturer, specifies a tonnage and boom length, and finalizes the order if the price is roughly acceptable. Only after installation do problems emerge—insufficient slew angle blocked by a pillar, boom length too short to reach the farthest workstation, or equipment so large that it blocks workshop aisles.

The core of jib crane selection is not "which equipment to choose," but "understanding your own workstation." Equipment is standardized, but workstation environments vary greatly. This article starts with workstation environment diagnostics to help procurement and technical personnel build a practical selection logic.

First, identify the Workstation Type: fixed-point or Multi-Point Coverage

This is the foremost question to clarify. According to the selection logic in GB/T 3811-2008 Design Rules for Cranes and JB/T 8906-2018 Jib Cranes, the first step in selecting lifting equipment for a workstation is to examine the coverage range and load characteristics.

For a single fixed workstation—such as loading/unloading for one machine tool, a single mold change point, or one welding station—a column-mounted jib crane is the most straightforward choice. It rotates around a column, covering a circular or sector-shaped area, with a simple structure and the lowest cost.

If the workstation is not fixed or needs to serve multiple points—for example, multiple assembly stations on a production line, or one station serving two or three machines—two cases apply: if the points are not far apart and fall within the jib's slewing radius, a long-boom jib crane suffices; if the distances are large and linear travel is more efficient, a KBK track-type crane may be more suitable, as its coverage is a rectangular plane that can link multiple stations.

A common mistake is using one large-radius jib crane to cover a wide area, resulting in excessive boom length, excessive deflection, noticeable end sag under load, inaccurate positioning, and safety risks. JB/T 8906-2018, Section 5.2, explicitly requires that the deflection at the jib tip must be ≤ 1/250 of the span, and for booms exceeding 6 meters, diagonal bracing or reinforced structures must be added. If a shorter boom can solve the problem, do not oversize.

Next, Assess Space Constraints: Ceiling, Wall, and Floor Conditions

The spatial conditions of the workstation directly determine what type of jib crane can be installed.

Ceiling height is a hard constraint. For workshops with ceiling heights below 3 meters, standard jib cranes are often unsuitable because the space below the jib must accommodate the hoist and rigging, leaving insufficient clearance. In such cases, either a low-headroom jib crane must be custom-made, or a lightweight aluminum track solution should be considered. Ceiling heights of 4–6 meters are ideal, accommodating most standard jib cranes. Ample ceiling height is also necessary for large slewing-radius models.

Wall conditions are equally critical. If the workstation is adjacent to a load-bearing workshop wall or load-bearing column, a wall-mounted jib crane may be a better option—it occupies no floor space and does not obstruct workshop aisles. However, the wall must be a structural load-bearing element; ordinary partition walls or light steel structures lack sufficient capacity, and forced installation risks detachment. Before installation, verify wall thickness and structural strength; typically, concrete walls should be at least 300 mm thick, or steel columns must meet load-bearing requirements.

Floor foundations must not be overlooked. Column-mounted jib cranes require a concrete floor for anchoring. According to JB/T 8906-2018, Section 4.2, anchor bolt installation requires concrete thickness of no less than 150 mm with adequate strength. If the floor in an older workshop does not meet these requirements, either reinforce the floor or switch to a wall-mounted or mobile solution.

Calculate the Load Accurately: "Able to Lift" Is Not "Safe to Lift"

When load capacity selection goes wrong, it is usually not because the chosen capacity is too small, but too large—not because larger is bad, but because it is unnecessary. According to statistics from Jiangsu Puguan Electromechanical from 126 projects between 2024 and 2026, about 35% of customers initially overestimated their needs, selecting oversized tonnage that increased procurement costs by 20%–40% and added foundation burden.

There is a frequently overlooked relationship between boom length and lifting capacity: the longer the boom, the lower the actual lifting capacity at the same rated tonnage. When selecting, do not look only at the "rated lifting capacity"; always consult the manufacturer's load curve chart to confirm the actual capacity at the farthest working radius. Some equipment may be rated at 1 ton with a 5‑meter boom, but at the 5‑meter position, it can only lift 600 kg. If not checked during selection, you may find it insufficient after installation.

Matching Recommendations for Different Working Conditions

Machine shop: Prioritize column-mounted jib cranes with reinforced main beams, epoxy or hot-dip galvanized anti-corrosion treatment, and dust-sealed slewing bearings. Capacity mainly ranges from 0.5 to 3 tons, with boom length determined by workstation coverage.

Precision assembly lines: The focus is not on the jib crane itself but on the hoisting mechanism. Select variable-frequency electric hoists or paired with intelligent lift assists, achieving jerk-free operation with start/stop acceleration ≤ 0.2 m/s². Combined with floating functions, operators can manually fine-tune workpieces with positioning accuracy up to ±0.5 mm.

Warehousing and logistics areas: For layouts along walls, choose wall-mounted jib cranes with zero floor footprint; for long aisles requiring mobile operations, choose mobile or track-type cranes. Wall-mounted jib capacities generally do not exceed 1 ton and boom lengths are less than 4 meters, suitable for light-load, high-frequency scenarios.

Hard Conditions to Confirm Before Selection

Before contacting manufacturers for quotes, get these items clarified—they will save 80% of subsequent communication effort:

What is the horizontal distance from the farthest workstation point to the column mounting position? This determines boom length; add 0.3–0.5 meters of operating margin.

What is the total weight of the heaviest workpiece + rigging? Use the heaviest everyday item, not the occasional extreme load.

Approximately how many lifts per day? This determines the safety factor and whether electric or manual slewing is appropriate.

What is the clear ceiling height at the installation location? Account for column height + jib height + hoist and rigging height + safety clearance.

Can the floor conditions meet installation requirements? Concrete thickness, strength, and whether walls are load-bearing. If uncertain, arrange a professional on-site survey.

The essence of jib crane selection is to make the equipment fit the workstation—not to force the workstation to accommodate the equipment.