Overhead Crane Engineering: Girder Design to Welding Guide

Overhead crane design and manufacturing require expertise across structural mechanics, electrical control systems, safety monitoring, test validation, and welding processes. Drawing on years of engineering experience and field-proven practice, Kelude has organized the overhead crane technology framework into seven core topics that cover the full technical chain—from main girder structural design to welding quality control. This article serves as an entry point to the series, offering a high-level overview and technical roadmap so readers can jump directly to the topic that matches their needs.

Overhead Crane Technology Series: Topic Overview

The table below summarizes the seven technical articles, including each topic's engineering discipline, key content, reference standards, and article links:

Crane Main Girder Structural Design & Finite Element Analysis

Complete Guide to Crane Main Girder Structural Design and FEA serves as the foundation of this series, walking through the full design workflow from load calculation and cross-section selection to finite element verification. It compares four cross-section types—box girder, I-beam, truss girder, and cellular girder—covering their application ranges and technical-economic trade-offs. The article details load combinations A through D with calculation methods, plus strength, stiffness, and stability check formulas. The FEA section addresses shell element modeling, meshing strategy, boundary conditions, and load application, validated by a 20t-22.5m QD-type crane case study where theoretical calculations and FEA results agree within 5%.

Crane VFD Selection and Parameter Configuration

Crane Variable Frequency Drive Selection and Tuning: Engineering Practice uses the Siemens G120 VFD as its reference platform, covering the design and commissioning of variable-frequency drive solutions for hoisting, bridge travel, and trolley travel mechanisms. Topics include main circuit reactor and braking resistor sizing, SLVC vector control parameter tuning, precise hoist brake control timing, and dual-motor master-slave communication integration—all demonstrated through a complete 20t QD-type crane retrofit case study.

Crane Safety Monitoring and Management System (GB/T 28264)

Understanding GB/T 28264 for Crane Safety Monitoring Systems focuses on the critical safety assurance infrastructure for crane operations. It breaks down the Level A and Level B classification requirements and presents a four-tier architecture spanning sensing, control, data processing, and display layers. The article covers load limiter accuracy calibration, encoder selection for hoisting height and travel distance measurement, safety circuit design using normally-closed brake door interlock contacts, and MQTT/OPC UA protocol recommendations for remote data transmission.

Crane Electrical Control System Design

Full Workflow for Crane Electrical Control System Design spans the entire design cycle from electrical schematic development to PLC program commissioning. The methodology follows a four-layer design approach: main circuit diagrams, control circuits, PLC I/O wiring, and safety circuits. Component selection covers PLCs (comparing S7-1200 and S7-1500), VFDs, HMIs, load limiters, and encoders. The PLC program adopts structured programming with function block diagrams for hoist control, safety protection, and fault diagnosis.

Crane Load Testing and Type Testing Procedures

Crane Load Test and Type Test Procedures Explained aligns with FEM 1.001 and TSG Q0002 standards, specifying test methods, operating steps, and acceptance criteria for no-load tests, rated load tests (110% Q), static load tests (125% Q), and dynamic load tests (110% Q). It includes pre-test checklists, required test instrument configurations, test report templates, and corrective actions for common issues such as excessive main girder deflection and brake overheating.

Crane Anti-Sway Control Technology

Crane Anti-Sway Control: Principles and Engineering Implementation systematically compares three mainstream anti-sway approaches: open-loop input shaping (ZV/ZVD), closed-loop state observer with LQR, and adaptive control (MRAC/STR). Starting from single-pendulum dynamics, it derives swing period formulas for different rope lengths, provides shaper parameter tuning methods, and outlines the application scenarios and hardware requirements for both open-loop and closed-loop solutions.

Crane Main Girder Welding and Weld Quality Control

Complete Guide to Crane Main Girder Welding and Weld Quality Control covers design requirements for longitudinal fillet welds and stiffener welds, filler metal selection (E4315 for Q235B, E5015 for Q345B), welding parameters for CO₂ gas-shielded welding and submerged arc welding, and distortion control techniques including symmetrical welding sequences, backstep welding, and preforming. Non-destructive testing follows the GB/T 11345 ultrasonic testing standard with corresponding acceptance criteria.

Technical Comparison

The comparison table below evaluates all seven topics across four dimensions—technical complexity, hardware investment, application scenarios, and reference standards—to help readers quickly identify the most relevant guide for their needs:

How to Use This Series

This series is designed to be read in sequence, though each topic stands alone. Start with Topic 1 (Structural Design) to build a solid foundation in overhead crane structural principles, then move through Topic 2 (Variable Frequency Drive) and Topic 4 (Electrical Control) to master electrical control system design. Topic 3 (Safety Monitoring) covers the relevant safety standards, while Topic 5 (Test & Inspection) outlines pre-shipment verification methods. Topic 6 (Anti-sway Control) introduces advanced control functionality, and Topic 7 (Welding) addresses quality control in the manufacturing process. Readers with specific needs may jump directly to any topic without prior reading.

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