Dual-Machine Lifting, Heavy Equipment in Place | Double-Girder Bridge Crane with Hook Assists Taiyuan Heavy Industry in Upgrading Pressure Vessel Manufacturing

As a leading enterprise in China’s heavy equipment manufacturing industry, Taiyuan Heavy Industry Co., Ltd. (hereinafter referred to as “Taiyuan Heavy Industry”) has always represented the nation’s manufacturing strength in the fields of high-end pressure vessels and heavy chemical equipment. In the production and manufacturing of large pressure vessels, the precise lifting and transfer of core components weighing over 100 tons is a crucial link in ensuring product quality and production efficiency. To overcome the pain points of low efficiency, high risk, and insufficient precision in traditional lifting methods, Taiyuan Heavy Industry introduced our customized dual-machine linkage system for double-girder bridge cranes. This successfully achieved efficient and safe lifting of large pressure vessels throughout the entire process from welding and machining to final assembly, providing core support for the company’s strategic transformation of “Taiyuan, Taiyuan, Lijiang, Xishan, and Leapfrog Transformation.”

Project Background: Lifting Challenges in Heavy Equipment Manufacturing

Taiyuan Heavy Industry’s pressure vessel workshop mainly produces core equipment such as large hydrogenation reactors and turbine cylinders. A single piece of equipment can weigh 150-300 tons and exceed 15 meters in length. The production process faces multiple industry-level lifting challenges:

Strict Collaboration Requirements: A single crane cannot balance the stress points of long pressure vessels, easily leading to equipment tilting and deformation. Traditional two-crane manual operation suffers from poor synchronization and low error tolerance, making it difficult to adapt to modern production rhythms.

Extremely High Precision Standards: The mating gap between the pressure vessel and its components must be controlled at the millimeter level, placing extreme demands on the crane’s micro-speed control and positioning accuracy.

Prominent Safety Risks: Lifting equipment weighing over 100 tons at close range exposes the company to risks of collisions and overturning. High-intensity repetitive labor can also lead to operator fatigue, increasing the probability of accidents.

Strategic Transformation Needs: The company is advancing its “leapfrog transformation” strategy and urgently needs intelligent lifting equipment to improve production efficiency and support the capacity upgrade of high-end equipment manufacturing.

Based on this, Taiyuan Heavy Industry proposed a core requirement: to create a “one-control-two” linkage system for double-girder bridge cranes, achieving synchronous and precise control of two cranes while balancing operational efficiency, safety protection, and production flexibility.

Customized Solution: Dual-Girder Bridge Crane Linkage System

Targeting the specific working conditions of the Taiyuan Heavy Industry Pressure Vessel Workshop, our technical team conducted in-depth research on the equipment’s weight, dimensions, and process requirements. We tailored a dual-girder bridge crane linkage integrated solution, achieving full-dimensional customization from structural design and intelligent control to safety protection.

1. Core Hardware: Heavy-Duty Structure, Solid Foundation for Heavy Equipment Lifting

The heavy-duty main girder of the dual-girder crane adopts a Q345B low-alloy high-strength steel box-type welded structure. It undergoes overall annealing stress relief treatment and 100% non-destructive testing to ensure no main girder deflection or deformation during long-term, high-frequency operation under a 300-ton rated load.

Synchronous Lifting of Dual Cranes: The rated lifting capacities of the two crane main hooks are 200 tons and 150 tons respectively. A four-point flexible connection is achieved through a dedicated equalizing beam lifting device, evenly distributing the stress on the pressure vessel and preventing structural deformation and surface scratches during lifting.

1. High-Efficiency Drive System: Equipped with a hardened gear reducer and dual brake motors, the lifting speed can be adjusted from 0.5-5 m/min, and the trolley/gantry travel speed is 0-30 m/min, precisely adapting to the stability requirements of pressure vessel transfer and the high precision requirements of final assembly docking.

2. Intelligent Control: One-to-two linkage unlocks precise lifting.

Synchronous Control Algorithm: The system is equipped with an industrial-grade high-performance PLC controller and a dedicated synchronous control algorithm, achieving “one person, one control, dual-machine synchronization.” Operators can simultaneously lift, travel, and position two cranes from the control room, with synchronization errors controlled within ±1 mm.

Precise Positioning and Docking: Through absolute travel limiters and laser positioning technology, the cranes can precisely lift pressure vessels to the final assembly position, with positioning errors controlled within ±2 mm, perfectly adapting to the docking requirements of automated assembly lines.

Flexible Mode Switching: Supports one-click switching between “linkage-independent” modes. When one machine needs maintenance, the other can operate independently, ensuring uninterrupted production.

3. Safety Protection: Multiple Redundancies Safeguard Heavy Equipment Manufacturing

Load Protection: Equipped with a high-precision lifting capacity limiter, automatically alarming and cutting off power in case of overload;

Synchronization Protection: When the synchronization deviation between the two machines exceeds the threshold, the system automatically decelerates and stops;

Positioning Protection: Both the trolley and crane are equipped with absolute travel limiters and anti-collision buffers to avoid equipment collisions;

Personnel Protection: The control room is equipped with emergency escape devices and audible and visual alarms; the crane is equipped with an anti-disengagement device and a video monitoring system;

Emergency Protection: Equipped with a dual-power switching device, allowing for safe hook lowering in case of sudden power failure.

Project Implementation: Heavy Equipment Empowerment, Remarkable Results

After on-site installation, commissioning, and personnel training, this double-girder bridge crane dual-machine linkage system was officially put into use in the pressure vessel workshop of Taiyuan Heavy Industry in 2023, deeply integrated into the entire production process of large pressure vessels, achieving significant application results.

1. Significantly Increased Production Efficiency

The “one-control-two” linkage model completely replaces traditional manual collaborative operations. The inter-process transfer time for a single pressure vessel has been reduced from 45 minutes to 15 minutes, and the final assembly docking efficiency has increased by 70%. The workshop’s pressure vessel production cycle has increased from 8 units per month to 15 units per month, with an annual capacity increase of 87.5%, helping Taiyuan Heavy Industry successfully complete equipment delivery tasks for several key national projects.

2. Continuous Optimization of Product Quality

Synchronous and precise lifting and millimeter-level positioning accuracy effectively avoid tilting and deformation problems during pressure vessel lifting, increasing the final assembly docking qualification rate from 90% to 100%. The application of specialized equalizing beam lifting tools has reduced the surface scratch rate of equipment by 95%, further ensuring the factory quality of high-end equipment.

3. Dual Optimization of Safety and Cost

Safety is controllable: “Zero-close-range operation” for operators has been achieved, and no safety accidents have occurred since its commissioning, significantly reducing occupational health risks for workers.

Cost Optimization: The project reduced on-site operator staff by 60%, increased the mean time between failures (MTBF) to 10,000 hours, and lowered maintenance costs by 40% compared to traditional methods, significantly optimizing the workshop’s production cost structure.

4. Industry Demonstration Effect: This project has become a benchmark case for “intelligent hoisting” in the heavy equipment manufacturing field. Its “double-girder bridge crane + dual-machine linkage” technical solution provides valuable reference for hoisting upgrades in other heavy equipment manufacturing enterprises in China. A relevant person in charge of Taiyuan Heavy Industry stated, “This customized hoisting system perfectly solved our long-standing problem of hoisting large pressure vessels, not only improving production efficiency but also strengthening safety measures, serving as a crucial support for achieving our ‘leapfrog transformation’ strategic goal.”

Conclusion: Starting from the heavy equipment manufacturing needs of Taiyuan Heavy Industry and addressing industry pain points with customized technical solutions, the successful application of our double-girder bridge crane dual-machine linkage system once again demonstrates the value of deep integration between industrial hoisting equipment and high-end equipment manufacturing. In the future, we will continue to focus on the field of heavy equipment manufacturing, and help China’s heavy equipment manufacturing reach a higher level with more intelligent and reliable lifting solutions.