Upper Package Lower Fancy Gantry Crane

Upper “enclosed” structure: The main beam and trolley running area adopt a closed box-type structure (“enclosed”), formed by welding steel plates into a closed cross-section. This design enhances the main beam’s torsional stiffness and overall stability, enabling it to withstand significant vertical loads and horizontal forces, making it suitable for high-precision operation of the hoisting mechanism. Additionally, the enclosed structure provides a more stable track foundation for trolley operation, reducing vibration and swaying, thereby ensuring safety during heavy-load or precision lifting operations.

Lower “lattice” structure: The legs and lower support sections adopt a lattice-type (“lattice”) design, formed by connecting structural steel (such as angle steel, channel steel) via bolts or welding to create a perforated truss structure. This structure significantly reduces the equipment’s self-weight, minimizes pressure on the foundation, and offers excellent ventilation to reduce wind resistance, making it particularly suitable for outdoor, windy environments (such as ports and cargo yards).

Description

The upper box-type lower lattice-type gantry crane is an innovative lifting device that combines the advantages of two structural designs. Its design cleverly combines the characteristics of an upper closed box-type structure and a lower lattice-type truss structure, demonstrating unique performance and wide applicability in lifting operations.

From a structural perspective, the upper part of the crane adopts a closed box-type main beam, which significantly enhances the equipment’s torsional rigidity and overall stability, enabling it to stably carry medium to heavy loads of 5-50 tons and adapt to large-span operation scenarios of 15-40 meters, meeting the requirements for hoisting and transporting large cargo.

The lower section features a lattice-type trellis support leg design. The openwork structure not only effectively reduces the equipment’s self-weight, lowers the pressure on the foundation, and reduces foundation construction costs, but also significantly reduces wind resistance, enabling stable operation in open, windy environments and enhancing the equipment’s adaptability to complex climatic conditions.

Features

Upper closed box girder main beam:Use box-type welded structure (primarily made of Q355B high-strength steel), with a rectangular closed cross-section. The torsional stiffness is over 40% higher than that of truss-type main beams, effectively distributing loads and reducing deflection deformation during long-span operations (e.g., for a 20-ton model, deflection ≤ L/1000 at a 32-meter span). Ensuring stability during heavy-load (5-50t) lifting operations. Additionally, the enclosed structure protects internal walkways, cables, and transmission components from rain and dust, thereby extending the equipment’s service life.

Lower lattice-type gantry crane legs: The legs are fabricated using angle steel or channel steel welded into a triangular lattice-type structure. The open design significantly reduces the equipment’s self-weight (20%-30% lighter than fully enclosed gantry cranes), thereby decreasing the load on the foundation (reducing foundation bearing capacity requirements by 15%-20%) and saving on foundation construction costs. Additionally, the trellis structure has a low wind resistance coefficient (≤0.5), offering superior wind stability compared to fully enclosed models in open, windy environments such as ports and yards, and can withstand gusts of up to 8-10 on the Beaufort scale.

Wider operating range: Span coverage of 7.5–32 m (30% larger than single-girder gantry crane models), lifting height up to 6–24 m, with adjustable leg height to accommodate different site clearance requirements (e.g., factory eaves, container stacking areas). The smaller tonnage models (1-5 tons) emphasize flexible operation, while the larger tonnage models (10-20 tons) can meet the lifting requirements for long items (such as steel beams, precast panels) and heavy equipment.

Highly adaptable work level: Work levels are designed according to tonnage classification. Models ranging from 1 to 2 tons are classified as A3-A4 (light load, low frequency, such as sporadic loading and unloading in warehouses), while models above 3.5 tons are classified as A4-A5 (medium load, medium to high frequency, such as assembly line support in workshops and daily operations at ports). Some customized models can be upgraded to A6 (continuous operation) to meet the demands of different work conditions.

Precise speed control and smooth operation: The hoisting mechanism uses dual-speed or variable-frequency speed control (e.g., the 20t model has a hoisting speed of 0.4–4 m/min), ensuring smooth positioning at low speeds under heavy loads and efficient transportation under light loads; Trolley travel speed: 20–35 m/min; main crane travel speed: 30–50 m/min. The drive system is equipped with SEW or ABB motors, minimizing start/stop impact and achieving positioning accuracy of ±5 mm.

The upper-box, lower-truss gantry crane uses a “strong upper, light lower” structural combination that solves the problem of insufficient stability under heavy loads in truss-type main beams while overcoming the shortcomings of excessive self-weight and high wind resistance in all-box-type models. It is one of the optimal solutions for outdoor medium- to heavy-duty, large-span work scenarios in terms of strength, economy, and environmental adaptability.

Technical Data

Capacity1t2t3.5t5t10t16t20t
Span7.5-18m8-20m10-22m12-25m14-8m16-30m18-32m
Lifting height6-12m6-14m8-16m8-18m10-20m12-24m
Work DutyA3-A4A4A4-A5A5
Lifting speed8/0.8m/min6/0.6m/min5/0.5m/min4/0.4m/min
Hoist Traveling Speed20-30m25-35m
Crane Traveling Sprrd10-30m15-35m20-40m25-45m30-50m
RailP22P22-P28P28-P38P38-QU70QU70-QU80QU80-QU100QU100-QU120

Purchasing Process

FAQs About Choosing the Right Gantry Crane and Supplier

In order to obtain accurate quotes for custom overhead cranes, providing the following core information will greatly improve efficiency:

1. Key specifications: including rated lifting weight (tons), span (i.e., track spacing, meters), and lifting height (meters), which is the basis of the design.
2. Use environment and working conditions: Explain the conditions of the installation site (such as indoor/outdoor, temperature, humidity) and work level (busy level), which determines the material selection and configuration level of the structure.
3. Specific configuration requirements: clarify the drive mode (such as frequency conversion control), brand preferences for electrical components, safety devices (such as overload limiters, anti-collision systems), and whether special functions such as remote control are required.
4. Installation and service: confirm the on-site power supply conditions (voltage, frequency), installation conditions, and specific expectations for delivery time, installation and commissioning, and after-sales service.

The more detailed the information provided, the more accurate and reliable the solutions and quotations obtained.

1. Span and lifting capacity: this is the foundation.The larger the span and the higher the rated lifting weight, the material and design costs of the main beam and structure will increase significantly, and the higher the price.

2. Working level and frequency of use: The working level (A1-A8) represents the busy level and load status of the crane.Cranes with frequent and heavy-duty use require more durable motors, gearboxes and structural parts, and the cost is naturally higher than that of lightweight and occasionally used equipment.

3. Structure and configuration: The double beam is more complex and stable than the single beam structure, and the price is higher.At the same time, the lifting height, operating speed, motor brand, control system (ordinary vs frequency conversion), and the level of safety devices (such as anti-swing, load monitoring) all directly affect the final quotation.

4. Degree of customization and brand service: completely standard models have lower costs.The customized design based on the workshop environment (such as explosion-proof and high temperature), special processes (such as metallurgical special), brand added value, and after-sales guarantee system will all be reflected in the price.

In simple terms, when buying a bridge crane, it is necessary to consider “how much, how frequently, what environment and what configuration”, which determine its core value and price.

Which crane to choose mainly depends on your specific needs. You can quickly judge from the following four core aspects:

-Single-beam bridge crane: it is suitable for conventional workshops with light and medium loads (usually ≤20 tons), medium span, and low frequency of use. It is the most economical and versatile choice.
-Double-girder bridge crane: used for heavy-duty, long-span, or high-work-level occasions (such as frequent hoisting, metallurgy, heavy-duty assembly). Its stability, durability, and safety are higher, but the cost is also increased accordingly.
-Free vertical crane (cantilever/column type): suitable for fixed working points and working conditions with limited rotation range, such as beside machine tools, maintenance areas, or production line stations, it can efficiently use corner space and be installed flexibly.
-Grab crane: It is specially used for the handling, loading, and unloading of bulk materials (such as grain, coal, sand, and gravel). The only reason to choose it is that you need to deal with such unpackaged loose materials.

In simple terms, you can filter according to this logic:

First, according to the lifting weight and span, choose between a single beam and a double beam.
If the scope of operation is highly concentrated and the space is limited, consider a free vertical.
If the handling object is bulk material, it points directly to the grab type.

Yes. Our bridge cranes fully comply with and follow relevant international standards. Our company has passed a number of international certifications, such as the ISO 9001 quality management system, which guarantees that the management system ensures every aspect of the product, from design to delivery, is under high standards of quality control. Therefore, you can rest assured that our cranes are internationally competitive in terms of safety and quality.
 
In order to ensure the versatility, safety, and reliability of our products on a global scale, we strictly follow the mainstream international standard systems, including the International Electrotechnical Commission (IEC), European (EN/DIN), and the United States (ANSI/ASME) in the design and manufacturing process. For example, for the EU market, our products meet the detailed requirements of the Machinery Directive and CE certification. At the same time, we also actively adapt to specific regulations in other regions to meet the compliance needs of different customers.

Delivery times largely depend on whether the crane is standard or customized. Based on our experience, standard single-girder and double-girder cranes can be produced more quickly, while cranes with special spans, duty ratings, or environmental requirements naturally require additional engineering design time.

For each quotation, we provide an estimated production and delivery schedule based on your configuration and destination. Throughout the manufacturing process, our team maintains communication with the customer to ensure no unexpected issues arise before shipment.

Compared with many suppliers, Yangyumech mainly reflects the two differentiated advantages of high customization flexibility and clear international compliance when providing bridge cranes.

On the one hand, we focus on in-depth customized services. According to your specific needs, we can provide fully customized solutions on core parameters such as rated load capacity, span, and lifting height, and accept personalized requirements. This means that what you get is not a standard product, but exclusive equipment that accurately matches the working conditions of your workshop.

On the other hand, we attach importance to international standards and quality certification. Our products clearly meet the requirements of international certifications such as CE, which ensures that their safety and reliability can meet the mainstream standards of the international market, and provides you with additional quality confidence guarantees. Combined with our direct supply capabilities as a powerful factory, we can achieve better comprehensive value for you while obtaining compliant and customized products.

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Yangyumech is a leading professional manufacturer of cranes in China. Our company integrates the processes of crane research and development, manufacturing, sales and service.