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Home > Double Girder Overhead Crane > Hook Type Double Girder Overhead Crane

Hook Type Double Girder Overhead Crane

Hook Type Double Girder Overhead Crane
hook double girder overhead crane
hook type double girder overhead crane
QD type double girder overhead crane
QD model double girder bridge crane
Hook Type Double Girder Overhead Crane
hook double girder overhead crane
hook type double girder overhead crane
QD type double girder overhead crane
QD model double girder bridge crane
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Capacity:5 – 550 t (customizable)
Lifting Height:6 – 30 m (customizable)
Voltage/Hertz:(customizable)
Brand Name: YUNTIAN
Place of Origin: Henan, China
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Introduction

Technical Data (General Version)

Application

Features

PRODUCT INTRODUCTION

The Hook Type Double Girder Overhead Crane, widely known in the industry as the QD model, is a general-purpose, heavy-duty lifting solution engineered for indoor material handling across manufacturing plants, warehouses, and industrial workshops. Featuring a robust double box-girder bridge structure with a hook as the primary lifting attachment, this crane is the most widely deployed overhead crane type in the world—combining proven structural reliability, straightforward operation, and broad applicability across diverse industrial sectors.

TECHNICAL DATA

Parameter Specification
Lifting Capacity 5 – 550 t (customizable)
Span 10.5 – 31.5 m (customizable)
Lifting Height 6 – 30 m (customizable)
Work Duty Class A5, A6, A7
Lifting Attachment Forged hook
Control Method Cabin / Pendant / Wireless Remote
Power Supply customizable

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APPLICATION

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Food and beverage processing plants
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Warehouses, storage facilities, and logistics centres
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Electrical and electronics manufacturing
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Machinery repair and maintenance shops
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Automotive repair garages and service centres
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Small manufacturing workshops and assembly area

FEATURES

1
Heavy-Duty Double Box-Girder Structure — Two parallel high-grade steel main girders (Q345B) with full-penetration welding provide superior bending, torsion, and shear strength. Even load distribution across both girders eliminates the hook-side offset typical of single-girder cranes and ensures stable handling of heavy, unbalanced loads.
2
General-Purpose Hook Lifting — The forged hook is the most versatile lifting attachment in industrial crane operations, suitable for handling a wide variety of general cargo, machined components, equipment, and materials without the need for specialised lifting devices.
3
Smooth VFD-Controlled Operation Across All Motions — All motion axes—hoisting, cross travel, and long travel—are driven by variable frequency drives delivering stepless speed regulation. This delivers shock-free starts and stops, precise load positioning, and reduced mechanical stress on crane components.
4
Flexible Control Options — The crane supports cabin control (open or closed cabin), pendant control from ground level, or wireless remote control—allowing operators to select the safest and most efficient method for their specific working environment.
5
Comprehensive Safety Protection — Standard safety systems include overload limiters, upper and lower limit switches, emergency stop button, phase failure protection, travel limit switches on all motion axes, and polyurethane buffers.
6
Modular, Maintenance-Friendly Design — The crane's core components—bridge frame, crab trolley, hoisting mechanism, and electrical control system—are standardised, independently serviceable modules. This design simplifies routine inspection and reduces long-term maintenance workload.

FAQ

What is the primary technical difference between a QD-Type (Open Winch) and an LH-Type (Hoist Trolley) Double Girder Crane?

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While both are double girder overhead cranes, their hoist trolley architecture and duty capacities differ significantly: QD-Type (Heavy Duty Open Winch Trolley): Utilizes a heavy-duty open winch mechanism with independent motor, gearbox, drum, and mechanical brakes. Designed for capacities from 5t up to 500+ tons and continuous, high-frequency heavy duty cycles (ISO A5 to A8 / FEM 2m to 5m). LH-Type (Light/Medium Duty Hoist Trolley): Utilizes a standard electric wire rope hoist mounted on a double-girder frame. It offers a lower initial purchase price and compact deadweight, but is limited to lighter capacities (typically under 32t) and moderate duty ratings (ISO A3–A4).

Why are Hook Type Double Girder Cranes frequently equipped with Main and Auxiliary Hooks (e.g., 50t/10t)?

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A dual-hook configuration significantly improves operational efficiency and energy management in heavy manufacturing: Main Hook (Heavy & Slow): Used for lifting maximum rated loads (e.g., 50 tons) with low speeds for high safety and positioning precision. Auxiliary Hook (Light & Fast): Handles lighter daily loads (e.g., 10 tons) at much higher hoisting speeds. This conserves electricity, reduces mechanical wear on the main drive, and substantially speeds up general material transport. Combined Operations: Enables two-point lifting or tilting of long, heavy workpieces when operated in coordination.

How do I select the correct Duty Class (ISO A3 to A8) for a QD Model Double Girder Hook Crane?

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The duty classification determines structural fatigue life and mechanical component sizing based on daily operational hours and average load factors: ISO A3–A5 (Light to Moderate Duty): For general machinery repair shops, assembly bays, or warehousing with intermittent lifting (4–8 hours/day). ISO A6–A7 (Heavy Duty): For steel fabrication, paper mills, container yards, and busy foundries operating continuously (12–16+ hours/day). ISO A8 (Extra Heavy Duty): For non-stop 24/7 continuous process lines in steel rolling mills, melt shops, and heavy bulk hubs under maximum load conditions.

What crucial civil engineering data (such as maximum wheel load) is needed before installing a double girder hook crane in a workshop?

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To ensure structural safety and prevent runway beam deformation, our engineering team provides full civil load data prior to manufacturing:Maximum Wheel Load ($P_{max}$): Calculated based on full rated capacity plus trolley weight at the extreme end of the main girder. Your building’s runway beams, steel columns, and brackets must be verified against this figure.Hook Approaches & Dead Zones: We optimize the trolley and bridge end-truck profiles to minimize $C$ and $K$ dimensions (distance from hook center to wall/rail end), maximizing usable hook coverage across your factory floor.

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PROFESSIONAL CRANE MANUFACTURER

We are a physical factory that has been engaged in lifting manufacturing for nearly 20 years. Committed to providing all customers with high-quality services and building a long-term future A long-term business cooperation relationship.
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