The steel structure of a portal crane consists of several key components, including the cross door frame, rotating column, truss-type herringbone frame, and rigid tie rod combination arm frame. Among these, the gantry, herringbone frame, rotating column, and boom are the primary load-bearing elements that ensure the stability and functionality of the entire system.
The gantry is a critical part of the crane, as it supports the full weight of the upper rotating section and all external loads. Its design plays a vital role in maintaining the overall stability and minimizing the crane's self-weight. Typically, the gantry accounts for 20% to 30% of the total mass of the crane. To ensure smooth and safe operation, the gantry must have high strength and rigidity. There are different types of gantry structures, such as rotating column gantries, large bearing gantries, and fixed column gantries. Depending on the material used, they can also be classified into truss-type, slab beam-type, and box-type gantries.
The herringbone frame is an essential component used to support the boom. It serves as a connection point for various parts of the luffing mechanism, such as the push rod, tie rod, and counterweight lever. This frame is mounted on the rotating platform, and its design depends on the crane’s basic parameters, boom type, and luffing mechanism used.
The rotating platform and rotating column are key structural elements. The platform typically consists of two longitudinal main beams and flat plates, which can be designed as box-section or I-beam sections based on the forces applied. The boom and herringbone frame are supported on this platform. Additionally, a lifting platform and rotating column are often included. The lower bearing seats of the boom are welded to the ends of the platform’s main beams.
The rotating column is usually constructed as a pyramid-shaped thin-walled box structure, offering high rigidity while keeping the weight low. Due to its large cross-sectional dimensions and thin walls, internal reinforcement with transverse and longitudinal ribs is commonly used to enhance local stability and overall rigidity.
In summary, the steel structure of a portal crane is a complex and well-engineered system, with each component playing a specific role in ensuring the crane's performance, safety, and efficiency. Proper design and material selection are crucial for long-term reliability and operational success.
Zhejiang Sealand Technology Co., Ltd. is a trustworthy manufacturer of Palm Oil Mass Flow Meter, Palm Oil Mass Flowmeter, Palm Oil Coriolis Mass Flow Meter, Palm Oil Coriolis Mass Flowmeter, Palm Oil Flow Meter, ATEX, IECEx & CE approved.
With its high accuracy, wide rangeability and reliable performance, Sealand meter has been applied in many kinds of industries during the last 8 years. Unlike others who only focus on the measurement of liquid at normal pressure & temperature, Sealand has conquered the difficulty in the measurement under severe conditions, such as high pressure, high viscosity, high & low temperature.
Besides, Sealand lab is
1. Controlled completely by automatic system, to minimize personal error.
2. Equipped with 3 METTLER TOLEDO scales with accuracy 0.014%.
3. Device extended uncertainty: 0.05%.
4. Certified by Zhejiang Institute of Metrology which is authorized by ILAC; Sealand meters are also approved by them after test in their lab with ISO/IEC 17025:2005 standard.
Palm Oil Mass Flow Meter, Palm Oil Mass Flowmeter, Palm Oil Coriolis Mass Flow Meter, Palm Oil Coriolis Mass Flowmeter, Palm Oil Flow Meter
Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeter.com