500 Intelligent Overhead Cranes Per Year: New Kelude Production Line
New Production Line for 500 Intelligent Overhead Cranes per Year Now Operational, with Over 90% Automation in Key Processes. Transitioning overhead crane manufacturing from one-off, small-batch production to standardized, mass production is essential for scaling up.
Moving from one-off, small-batch production to standardized, mass production is a critical step for overhead crane manufacturers aiming to scale. Kelude Heavy Industry has recently completed and commissioned a production line designed to manufacture 500 intelligent overhead cranes annually. Three core lines—an H-Beam intelligent welding line, a robotic automatic coating line, and an AGV-based intelligent logistics system—are now fully operational, with automation rates exceeding 90% in key processes.
Production Line Layout & Annual Capacity
The new production line covers approximately 15,000 m² and is designed for an annual output of 500 intelligent overhead cranes (including 350 Bridge Cranes and 150 Gantry Cranes). The line follows a U-shaped layout: raw materials enter at one end and progress through six stages—cutting, welding, machining, coating, assembly, and final assembly & commissioning—before the complete machine exits at the other end. The line is equipped with 16 automatic welding robots, 4 intelligent coating systems, and 20 AGV logistics carts.
Core Production Lines: Technical Overview
H-Beam Intelligent Welding Line features a dual-station layout with two welding robots working in collaborative operation. Welding parameters for the main girder box girder and end carriages are transmitted from the MES system directly to the welding workstations. The robots' seam-tracking system uses laser vision sensors to detect groove positions in real time and automatically correct the welding path.
Robotic Automatic Coating Line combines reciprocating sprayers with six-axis industrial robots. Steel structural components are conveyed into the spray booth via an overhead conveyor chain, where robots automatically identify the overall dimensions of each workpiece and call up the corresponding spraying trajectory from the program library to apply primer and topcoat. Coating thickness is controlled to an accuracy of ±5 μm.
AGV Intelligent Logistics System consists of 20 back-mounted AGVs available in two load capacities: 3t and 10t. The AGV system communicates in real time with the WMS and MES systems, receives material dispatch tasks, and automatically navigates to the warehouse to pick up and deliver materials to designated workstations.
Automation Rates Across Key Processes
The welding process achieves a 92% automation rate (measured as the proportion of weld length completed by automatic welding robots), with robotic welding coverage reaching 100% for critical weld seams (main girder longitudinal seams and fillet welds). Automatic spraying covers 95% of the coating process. AGVs handle 85% of total material transport tasks. Some assembly stations still require manual operations (such as electrical wiring and limit switch installation & commissioning), resulting in an automation rate of approximately 40% for the assembly stage. The overall automation rate across the entire production line is about 91%.
Intelligent Manufacturing & Quality Management
The production line is supported by a comprehensive digital Quality Management System. An online detection system for welding quality performs 100% ultrasonic testing on main girder longitudinal seams, automatically generating UT inspection reports within 30 minutes after welding. For coating quality, a film thickness detector installed at the spray booth exit automatically measures and records coating thickness at 5 points on each workpiece.
With the new line in operation, the standard Production Lead Time for overhead cranes has been reduced from 22 working days per unit to 12 working days. Intelligent overhead cranes now come standard with an AI visual safety monitoring system and a remote Operation & Maintenance communication terminal, making them ready for remote O&M connectivity from the moment they leave the factory.
FAQ
Q: Does producing 500 cranes per year mean the products will become standardized and lose customization capabilities?
A: Not at all. Kelude Heavy Industry employs a flexible production model combining standard modules with customized configurations. Modular design breaks down the overhead crane into five standardized modules: main girder, end carriage, trolley frame, electrical system, and safety system. Customers can select combinations of Lifting Capacity, Span, Lifting Height, Work Duty, and special features (such as explosion-proof, metallurgical duty, or Variable Frequency Speed Control) through a configuration table. This flexible model—standard modules plus customized configurations—achieves approximately 85% standard components and 15% customized combinations.
Q: How is product quality consistency ensured with the new production line?
A: Welding parameters for the robots are uniformly issued by the MES system to eliminate manual operation errors. The coating robots' spraying trajectories and film thickness are controlled through automatic detection with Closed-Loop Control. Online detection systems perform 100% automatic inspection of key parameters. Quality consistency data shows that the standard deviation between production batches from the new line is approximately 50% lower compared to traditional manufacturing methods.
Q: Can the new production line handle non-standard cranes (e.g., large span, large tonnage, special environments)?
A: Yes. Structural components for non-standard cranes that exceed the standard line's processing dimensions are pre-processed in a reserved large-component machining area within the workshop, then returned to the main line for subsequent steps. Welding and coating of large non-standard components are carried out using mobile robot solutions. Over the past 12 months, the new line has produced two 100t Metallurgical Foundry Cranes, one Gantry Crane with a 35m span, and three Explosion-Proof Cranes.
Q: What is the approximate investment scale for a 500-unit-per-year production line, and what is the expected payback period?
A: The total investment for the production line is approximately CNY 65 million (including factory building, equipment procurement, information system implementation, and trial run costs). With an average unit selling price of around CNY 350,000 and a 20% gross margin, the estimated annual output value is about CNY 175 million, with a gross profit of roughly CNY 35 million. After factoring in equipment depreciation (straight-line over 10 years), maintenance costs (approximately CNY 1.5 million per year), and operating expenses, the payback period is estimated at 4–5 years. The local government has provided approximately CNY 6 million in technical renovation subsidies for the Smart Manufacturing production line project, reducing the actual total investment by about 10%.
