In the fields of steel processing and laser cutting, the loading and unloading of steel plates has always been the core bottleneck restricting both production efficiency and safety. Traditional loading methods rely on plate hooks and vacuum suction cups, but they often struggle with issues like deformation of thin plates or insufficient suction force for thick ones, leading to the frustrating dilemma of "unable to grip securely, unstable suction." Meanwhile, the unloading process faces significant challenges due to the wide variety of workpiece types and enormous differences in size, resulting in inefficient manual picking and posing serious safety risks. After 23 years of accumulated expertise in electro-permanent magnet technology, Qianhao Magnetic Electric is proud to introduce Full-coverage electro-permanent lifting device , revolutionizing the design to thoroughly solve this industry challenge.

I. The "Four Major Challenges" in Traditional Steel Plate Loading and Unloading

1. Feeding Stage: The Dual Challenge of Thin-Plate Deformation and Insufficient Suction for Thick Plates

Traditional plate hooks, when used to grip thin sheets, concentrate stress at the contact point between the hook tip and the sheet surface, easily leading to bending and deformation of the thin material. For instance, a certain automotive parts manufacturer once experienced a 5% scrap rate in cold-rolled sheets just 0.8mm thick—resulting in direct financial losses exceeding one million yuan—simply because the plate hooks failed to securely hold the delicate metal. Meanwhile, vacuum suction cups, when handling plates thicker than 5mm, often suffer from insufficient suction force due to an imbalance between the cup’s surface area and the weight of the material, frequently causing slips and accidents. According to statistics from a laser cutting company, among all vacuum suction cup failures, the inability to properly grip thick plates accounted for as much as 67%, making it the single biggest obstacle hindering continuous production.

2. Material Preparation Stage: The "Triple High" Crisis of Manual Material Picking

Manual material handling requires workers to pick up each component individually after cutting is complete. When dealing with hundreds of part specifications, efficiency drops dramatically. According to real-world data from a major heavy machinery plant, manually cutting and preparing a single 12-meter-long steel plate takes as long as 45 minutes—and the physical strain is immense. Workers reportedly bend over more than 2,000 times per day on average, leading to an alarming incidence rate of lumbar spine disorders, reaching as high as 42%. Even more concerning, the sharp edges of the cut steel plates pose significant risks during manual handling, resulting in frequent laceration and crushing injuries. In fact, an annual safety report from one company revealed that accidents occurring during the material-handling phase accounted for 58% of all workplace injuries across the entire factory.

3. Workpiece Complexity: A Dual Challenge of Wide Size Ranges and Diverse Varieties

In laser cutting orders, the dimensions of workpieces can range from miniature parts measuring 43mm × 56mm all the way up to full sheets spanning 12 meters in length. These materials include dozens of types, such as carbon steel, stainless steel, and aluminum alloys. Traditional magnetic lifting tools, limited by their magnetic circuit design, often fail to provide sufficient suction force for small components, frequently resulting in missed picks. Moreover, when handling irregularly shaped workpieces, the uneven contact surfaces further compromise the stability of the grip. A certain shipbuilding company once experienced a costly incident: a precision part worth 120,000 yuan fell and was damaged due to a missed pick—quite a painful lesson indeed.

II. Full-Coverage Electromagnetic Lifting Grippers: The "Technological Nuclear Weapon" That Tackles Industry Pain Points

1. The Magnetic Circuit Revolution: From "Point Adsorption" to "Surface Coverage" Transformation

The Qianhao fully-coverage electro-permanent lifting magnet utilizes a patented cluster-array magnetic circuit structure (Patent No.: CN111599571A), featuring densely arranged independent magnetic poles at the bottom that generate a fully covering magnetic field across the steel plate surface. Each magnetic pole can independently adjust its magnetic strength, ensuring uniform suction force whether lifting miniature components measuring 43mm × 56mm or entire 12-meter-long steel plates. Measured data shows that this lifting magnet achieves an adsorption force of up to 1200 N/m² on 5mm-thick steel plates—significantly exceeding the industry standard requirement of 800 N/m².

2. Intelligent Magnetic Adjustment: Solving the Industry’s Persistent Issue of "Sticking to the Next Sheet"

To address the issue of steel plate adhesion during palletizing, Qianhao Lifting Gear has innovatively applied dynamic magnetic adjustment technology. By integrating built-in sensors that continuously monitor the spacing between steel plates, the system automatically adjusts the magnetic force intensity: During loading, full magnetic force is applied only to the topmost steel plate, while the magnetic strength for the plates below gradually diminishes to less than 10%, effectively preventing any adhesion. Testing conducted by a leading home appliance company demonstrated that this technology boosted the success rate of separating individual steel plates from 78% to an impressive 99.6%, while also increasing production efficiency by 40%.

3. Rapid Response: Complete loading and unloading of a 12-meter full board in just 3 minutes

The fully-featured electric permanent magnet lifting device integrates a rapid magnetization and demagnetization system, with magnetization taking just 0.8 seconds and demagnetization lasting 1.2 seconds. Paired with a high-precision servo motor, it enables seamless, fully automated handling of 12-meter-long steel plates—from the loading platform all the way to the cutting machine—reducing the single-cycle time to an impressive 3 minutes. Compared to traditional manual operations, this system boosts efficiency by 15 times, while equipment utilization jumps from 65% to 92%.

III. The Safety Revolution: From "Human Risk-Taking" to "Zero-Contact Operations"

1. Remote operation: Eliminating the risk of高空坠落

The lifting equipment is equipped with a wireless remote control system, allowing operators to safely perform the entire process—including demagnetization/re-magnetization, lifting, and lateral movement—from a secure zone up to 10 meters away. After implementation at a certain steel structure company, high-altitude work accidents during the material-cutting phase were reduced to zero, while safety investment costs dropped by 65%.

2. Magnetic redundancy design: Prevents workpieces from falling.

Employing a dual-circuit magnetic circuit design, even if one magnetic pole fails, the remaining poles can still provide more than 80% of the holding force. In practical tests conducted under simulated power-off conditions, the lifting device maintained its adsorption state for over 15 minutes, providing ample time for emergency response and handling.

3. Leak-proof suction algorithm: Intelligently identifies workpiece status

The built-in AI visual system can scan the surface of steel plates in real time, automatically identifying the position and quantity of workpieces. When a risk of missed suction is detected, it immediately triggers a secondary magnetization process, ensuring a 100% success rate for adhesion. After implementation at a certain automotive mold factory, the rework rate caused by missed suction dropped dramatically—from 12% to just 0.3%.

IV. Industry Benchmark: The "Efficiency Multiplier" in Laser Cutting

The Qianhao fully-encapsulated electric permanent magnet lifting device has become standard equipment for leading enterprises such as Sany Heavy Industry and Zoomlion. In real-world tests conducted at Sany’s Ningxiang Lighthouse Factory, this lifting device extended the daily operating time of laser cutting machines from 16 to 22 hours, resulting in annual labor cost savings exceeding 2 million yuan. Even more noteworthy is that its patented technology (CN111599571A) has created a significant technological barrier, driving the industry’s transition from "mechanical handling" to the era of "intelligent magnetic control."

Conclusion
While the industry is still grappling with the "last mile" challenge of loading and unloading steel plates, Qianhao Magnetic Electric has already delivered a flawless solution after 23 years of technological expertise. The fully integrated electric permanent-magnet lifting device not only resolves the dual dilemma of efficiency and safety but also redefines the production logic of laser cutting—where every steel plate is treated with care, and each lift strikes the perfect balance between precision and security.