Dongqi 10t European Double Girder Crane 9m Lift Installation Sale Eritrea

Product Overview

The QDX model European-spec double girder overhead crane from Dongqi Crane is a lightweight, FEM/DIN-based lifting system engineered around a single cost logic: reduce what the building has to carry, and the building itself becomes cheaper to build, heat, cool, and maintain.

Compared with traditional double girder overhead cranes, the QDX design delivers a minimum limiting distance from hook to wall and the lowest headroom in its class, allowing the crane to work closer to the front of the bay and achieve a higher lifting height within the same building envelope. The resulting increase in effective working space is not marginal—it changes what the building can do.

The more consequential advantage sits below the rails. Because the QDX crane is significantly lighter than a conventional double girder crane, wheel pressure is lower. New workshops can be designed smaller, with lighter runway beams and columns, while still performing more functions. A smaller, lighter workplace means saving a substantial amount of money from initial construction investment, and continuing to save on long-term heating, air conditioning, and structural maintenance over the life of the building.

Applications include workshops, maintenance shops, warehouses, shipyards, marinas, steel mills, military facilities, and other industrial environments where headroom, hook approach, and building cost all matter.

The Building-Cost Argument: Why QDX Is Different

Most crane specifications describe the crane. The QDX specification describes the building the crane allows you to build.

Quantified lightweight performance

Compared with traditional double girder overhead cranes of similar capacity and span, the QDX European-spec design achieves the following measurable reductions:

These are not marketing estimates. They are the direct result of FEM/DIN-based structural optimization and a modular component architecture: every kilogram removed from the girder, trolley, and end carriage is a kilogram the runway and building columns do not have to carry.

What lower wheel pressure actually saves

Runway beams and building columns are sized by wheel load. A 15–20% reduction in maximum wheel pressure translates into lighter runway girders, smaller corbels, and less structural steel in the building frame. In new construction, this frequently allows a lower building height, because the crane’s own headroom is 20–25% lower. A lower building envelope reduces:

• Structural steel tonnage in columns and roof framing

• Foundation size and concrete volume

• Cladding and roof area

• Heating and air-conditioning load, permanently

• Lighting volume and long-term maintenance access requirements

Dongqi’s engineering position is straightforward: the QDX crane is selected not only because it lifts the load, but because it lifts the load without forcing the building to be over-built.

Technical Specifications

Working class note. A5/A6 covers medium-duty through heavier general industrial service, including workshops with regular production cycling. For continuous heavy-duty or high-cycle applications, Dongqi reviews duty classification together with hoist group and wheel load rather than supplying a crane on capacity alone.

Design and Manufacturing

The QDX crane is built as a modular FEM/DIN system, with structural, mechanical, and electrical components designed as separable, interchangeable modules. This is not only a maintenance convenience—it is what makes the lightweight geometry possible without sacrificing rigidity.

Structural fabrication

• Main girder: double box-type welded girder, optimized for strength, rigidity, and stability to FEM requirements.

• Steel plate pretreatment: sandblasted to Sa2.5 before fabrication, removing mill scale and establishing a consistent surface for welding and coating.

• Web plate cutting: CNC cutting produces smooth, accurate curved profiles, allowing the girder camber and cross-section to be optimized rather than approximated.

• Welding and inspection: seams are welded by automatic arc welding and inspected by ultrasonic and X-ray testing.

• Machining: girder and trolley structures are machined on floor-type boring lathes to ensure flatness and accurate interface dimensions.

Mechanical and electrical components

• Motors: imported motors with insulation class F and IP54 protection, fitted with aluminium alloy stretched covers for heat dissipation.

• Reducers: imported German reducers with hardened gears, high load-bearing capacity, and sealed lubrication systems.

• Main electrical components: sourced from international brands such as Siemens and Schneider, with protection degree not lower than IP54.

• Wheels: forged from 65Mn alloy steel, heat-treated for wear resistance, anti-fatigue performance, and long service life.

• Transmission: all-in-one transmission mechanism for higher mechanical efficiency and fewer wear points.

VFD and motion performance

The QDX crane uses variable frequency control across hoisting, cross travel, and long travel. With a high-to-low speed ratio of 1:10, VFD control increases work efficiency by more than 20% compared with single-speed or conventional two-speed systems, while providing soft start/stop, reduced load swing, and precise positioning capability. This is particularly relevant for assembly, maintenance, and process applications where uncontrolled load motion creates risk or rework.

Safety and Control

The QDX crane is supplied with a safety system matched to the working duty and operating environment. Standard and available protection includes:

• Traveling and lifting limit switches to prevent over-travel in all motions.

• Overload protection device to prevent lifting beyond rated capacity.

• Voltage-lower protection and phase-failure protection.

• Emergency stop function at the operator interface.

• Sound and light alarm for travel and lifting motions.

• Polyurethane buffers and long-service bearings at travel extremities.

• Rain cover for hoist, drives, and electrical devices, allowing outdoor configuration where required.

Optional intelligent and safety functions available on request include anti-sway control, automatic positioning, turning-over hoist, winch servicing and monitoring, and remote diagnostic tools. Dongqi’s anti-sway technology is a patented system that limits hook oscillation during travel and positioning, supporting precision handling tasks where uncontrolled swing would create risk or damage.

Control options include pendant control, wireless radio remote control, and cabin control, with VFD interface integration across all motion axes.

Configuration and Selection Guidance

The QDX platform is configured rather than ordered as a fixed catalogue item. The following application conditions help define the appropriate arrangement:

For any application near the capacity, span, or duty limits, Dongqi reviews crane geometry, wheel load, building clearance, and hoist group together rather than quoting a crane in isolation. The objective is a crane that fits the building as designed, or a building designed around a crane that is lighter than the conventional alternative.

Manufacturer: Dongqi Crane

Dongqi Crane designs and manufactures the QDX European-spec double girder overhead crane as an integrated FEM/DIN lifting system, covering structural fabrication, hoist and trolley supply, electrical engineering, and control configuration. Dongqi supports configuration review, wheel-load verification, runway interface checking, and the decision between a complete crane supply and a crane kit where local fabrication capacity exists. The QDX series is applied across manufacturing workshops, metallurgy, petroleum, petrochemicals, ports, railway, civil aviation, power, and other general industrial environments.

Request a Configuration

To receive a matched QDX proposal from Dongqi Crane, please provide:

1. Capacity required (t)

2. Span (m, center-to-center of runway rails)

3. Lifting height (m, hook travel required)

4. Available headroom under roof or truss

5. Building structure (new build or existing; runway capacity if known)

6. Working environment (indoor/outdoor, temperature, special atmosphere)

7. Duty cycle (hours per day, shifts, load spectrum)

8. Control preference (pendant, radio remote, cabin)

9. Required positioning accuracy and whether anti-sway is needed