{"id":11959,"date":"2025-10-16T06:22:12","date_gmt":"2025-10-16T06:22:12","guid":{"rendered":"https:\/\/www.fhopepack.com\/videos\/?p=11959"},"modified":"2026-10-29T12:00:29","modified_gmt":"2026-10-29T12:00:29","slug":"magnet-steel-coil-lifting-machine","status":"publish","type":"post","link":"https:\/\/www.fhopepack.com\/videos\/magnet-steel-coil-lifting-machine\/","title":{"rendered":"Magnet Steel Coil Lifting: Electromagnetic Coil Lifters for Overhead Cranes"},"content":{"rendered":"<blockquote>\n<p><strong>Executive summary<\/strong>\nElectromagnetic coil lifters installed beneath overhead cranes provide safe, hook-free handling for eye-vertical (eye-to-sky) steel coils. The lifting magnet lands directly onto the upper annular face of the coil, establishes immediate magnetic flux, and hoists the load cleanly clear of the floor while an integrated crane readout displays dynamic gross weight. For mission-critical industrial safety, an automated battery backup power supply immediately sustains full magnetic holding force during an unexpected primary power cut until the coil is safely grounded.<\/p>\n<\/blockquote>\n<iframe loading=\"lazy\" width=\"1250\" height=\"703\" src=\"https:\/\/www.youtube.com\/embed\/lWUq2FplqSQ\" title=\"Magnet Steel Coil Lifting Machine\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<hr \/>\n<h2 id=\"table-of-contents\">Table of Contents<\/h2>\n<ul>\n<li><a href=\"#video\">How the lifting cycle works<\/a><\/li>\n<li><a href=\"#why-magnet\">Why lift coils with a magnet<\/a><\/li>\n<li><a href=\"#sizing\">Sizing the magnet<\/a><\/li>\n<li><a href=\"#setup\">What we set per crane<\/a><\/li>\n<li><a href=\"#selection-checklist\">Selection checklist<\/a><\/li>\n<li><a href=\"#safety\">Safety<\/a><\/li>\n<li><a href=\"#engineering-faq\">Engineering FAQ<\/a><\/li>\n<li><a href=\"#next-step\">Next step<\/a><\/li>\n<li><a href=\"#related-reading\">Related reading<\/a><\/li>\n<li><a href=\"#sources\">Sources<\/a><\/li>\n<\/ul>\n<h2 id=\"video\">How the lifting cycle works<\/h2>\n<p>The lifting process operates via a programmed sequence designed to ensure magnetic saturation before hoisting and uninterrupted coil retention through floor landing.<\/p>\n<table>\n<thead>\n<tr>\n<th>Step<\/th>\n<th>Cycle Phase &amp; Engineering Function<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Pick<\/strong><\/td>\n<td>The magnet lands directly on top of an eye-vertical steel coil, achieving full surface contact across the coil&#8217;s core laminations before the coils are energised.<\/td>\n<\/tr>\n<tr>\n<td><strong>Lift<\/strong><\/td>\n<td>The overhead crane hoists the coil vertically clear of the floor, eliminating horizontal drag and lateral side-loading.<\/td>\n<\/tr>\n<tr>\n<td><strong>Load<\/strong><\/td>\n<td>An integrated crane display registers the gross lifted weight dynamically, confirming load stability.<\/td>\n<\/tr>\n<tr>\n<td><strong>Power-off test<\/strong><\/td>\n<td>To verify backup supply reliability under emergency conditions, primary circuit power is cut at the control cabinet; the backup battery system engages instantaneously, maintaining full magnetic holding flux without flux degradation.<\/td>\n<\/tr>\n<tr>\n<td><strong>Set down<\/strong><\/td>\n<td>The coil is lowered smoothly onto the target floor saddle or pallet and de-energised through a controlled demagnetisation cycle for clean release.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Where integrated into automated slit coil packaging systems, these lifting units work alongside dedicated coil handling equipment\u2014such as hydraulic lifting saddles that adapt to varying coil widths, and built-in mechanical fail-safes engineered to prevent accidental load drop [manufacturer rating].<\/p>\n<h2 id=\"why-magnet\">Why lift coils with a magnet<\/h2>\n<ul>\n<li><strong>No hooks or slings.<\/strong> Operators do not need to stand beside, climb on, or reach under suspended coils to manually rig heavy mechanical C-hooks, chains, or synthetic slings.<\/li>\n<li><strong>No edge damage.<\/strong> Eliminates mechanical clamping forces and sling friction against the vulnerable inner diameter (ID) and outer diameter (OD) coil edges, protecting surface-critical strip and sheet products.<\/li>\n<li><strong>Fast cycle.<\/strong> Simplified handling sequence: land, energise, lift, transfer, lower, and release in seconds.<\/li>\n<li><strong>Tight storage.<\/strong> Eliminates the side clearance required for C-hook throat insertion, allowing eye-vertical coils to be stacked in dense storage configurations.<\/li>\n<li><strong>High-throughput line integration.<\/strong> For advanced processing plants, electromagnetic handling links seamlessly with continuous handling systems, including automated weighing stations and magnetic stacking stations typically handling 1\u20134 t coils [manufacturer rating].<\/li>\n<\/ul>\n<h2 id=\"sizing\">Sizing the magnet<\/h2>\n<p>Magnetic lifting capacity must account for coil geometry, contact surface quality, and regulatory safety margins, while ensuring the combined deadweight does not exceed the crane&#8217;s safe working load.<\/p>\n<p><strong>Worked example (illustrative).<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Heaviest coil (illustrative)<\/td>\n<td>12 t<\/td>\n<\/tr>\n<tr>\n<td>Safety factor for holding force (illustrative)<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Holding force needed, 12 \u00d7 2<\/td>\n<td>24 t<\/td>\n<\/tr>\n<tr>\n<td>Magnet own weight (illustrative)<\/td>\n<td>2 t<\/td>\n<\/tr>\n<tr>\n<td>Crane capacity needed, 12 + 2<\/td>\n<td>14 t or more<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Note: The required holding force incorporates a mandatory safety factor of 2:1 against breakaway forces under dynamic crane travel. Dynamic crane load calculations must always sum the heaviest coil weight plus the tare weight of the magnet lifter assembly.<\/em><\/p>\n<h2 id=\"setup\">What we set per crane<\/h2>\n<p>Each electromagnetic lifting unit is custom-configured to interface with the overhead crane&#8217;s structural limits, power feed, and operational duty cycle:<\/p>\n<table>\n<thead>\n<tr>\n<th>Setting<\/th>\n<th>Depends on<\/th>\n<th>Engineering Function<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Magnet size<\/strong><\/td>\n<td>Coil OD and ID<\/td>\n<td>Matched pole shoe surface area ensures magnetic flux covers the full radial wall thickness of the coil.<\/td>\n<\/tr>\n<tr>\n<td><strong>Holding force<\/strong><\/td>\n<td>Heaviest coil<\/td>\n<td>Sized to deliver rated magnetic breakaway force with a verified safety margin.<\/td>\n<\/tr>\n<tr>\n<td><strong>Backup supply<\/strong><\/td>\n<td>Hold time after power loss<\/td>\n<td>DC battery bank sized to maintain holding voltage for a specified duration (e.g., 10 to 30 minutes) upon total mains loss.<\/td>\n<\/tr>\n<tr>\n<td><strong>Control<\/strong><\/td>\n<td>Crane cab or pendant<\/td>\n<td>Wired to crane cab master controllers, radio remote pendants, or automated PLC integration for smooth positioning.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In integrated steel mill and processing bay designs, these lifters coordinate with upstream equipment, such as heavy-duty coil transfer cars, automatic down-enders, and multi-arm turnstiles rated up to 60 T with arm lengths to 2000 mm [manufacturer rating].<\/p>\n<h2 id=\"selection-checklist\">Selection checklist<\/h2>\n<p>Verify the following project parameters before finalising lifter specifications:<\/p>\n<ul>\n<li><strong>Coil OD, ID, width and weight:<\/strong> Minimum and maximum envelope dimensions and maximum piece weight.<\/li>\n<li><strong>Coil temperature:<\/strong> Ambient cold-rolled coils or elevated temperature hot-rolled coils (requiring high-temperature thermal barrier insulation).<\/li>\n<li><strong>Crane capacity:<\/strong> Verified crane hoist rating (must exceed heaviest coil weight + magnet tare weight).<\/li>\n<li><strong>Backup supply hold time:<\/strong> Required autonomous holding duration under mains failure until emergency set-down is completed.<\/li>\n<li><strong>Control from cab or pendant:<\/strong> Operator control configuration (crane cabin console, radio frequency pendant, or automated line handshaking).<\/li>\n<li><strong>Power supply:<\/strong> Plant supply voltage, frequency, and crane feed rail capacity.<\/li>\n<\/ul>\n<h2 id=\"safety\">Safety<\/h2>\n<p>Electromagnetic lifting operations require rigorous adherence to international handling standards and mechanical protocols:<\/p>\n<ul>\n<li><strong>Never stand under a lifted coil.<\/strong> Enforce mandatory exclusion zones under suspended loads at all times.<\/li>\n<li><strong>Test the backup supply on schedule.<\/strong> Conduct regular preventive load tests on emergency batteries and switchover relays to ensure seamless battery transition upon mains drop.<\/li>\n<li><strong>Lift only coils within the rated weight.<\/strong> Respect maximum safe working loads (SWL) for both the magnet lifter and crane hoist beam.<\/li>\n<li><strong>Structural fail-safes.<\/strong> Systems integrated into continuous packaging loops utilize built-in mechanical fail-safes designed to arrest unplanned displacement [manufacturer rating].<\/li>\n<li><strong>Standard compliance.<\/strong> For CE-marked industrial installations, the equipment is designed and manufactured according to <strong>ISO 12100:2010<\/strong> (Safety of machinery \u2014 General principles for design) and <strong>EN 13155:2020<\/strong> (Cranes \u2014 Safety \u2014 Non-fixed load lifting attachments).<\/li>\n<\/ul>\n<h2 id=\"engineering-faq\">Engineering FAQ<\/h2>\n<p><strong>Q: How does a magnet lift a coil?<\/strong>\nA: The energised electromagnetic assembly generates a closed magnetic loop through the top annular face of an eye-vertical coil, holding the mass securely without physical edge clamping.<\/p>\n<p><strong>Q: What happens if power fails?<\/strong>\nA: An automated uninterruptible backup battery supply engages within milliseconds to keep the electromagnets fully energised, maintaining required holding force while the crane operator lowers the coil to the ground.<\/p>\n<p><strong>Q: What crane do I need?<\/strong>\nA: The crane must be rated for the combined total of the heaviest coil plus the deadweight of the magnet assembly. For example, lifting a 12 t coil with a 2 t magnet requires a crane capacity of at least 14 t.<\/p>\n<p><strong>Q: Does it damage the coil?<\/strong>\nA: No. Because lifting forces are applied uniformly across the flat top surface without mechanical contact on the vulnerable inner eye or outer wrap edges, hook-induced bending, tearing, and crimping are eliminated.<\/p>\n<p><strong>Q: Which standards apply?<\/strong>\nA: For CE markets, the design, manufacturing, and safety margins comply with ISO 12100:2010 and EN 13155:2020 for non-fixed load lifting attachments.<\/p>\n<h2 id=\"next-step\">Next step<\/h2>\n<p>We match an electromagnetic coil lifting system to your crane capacity and production parameters in three steps:<\/p>\n<ol>\n<li><strong>Submit your layout drawing<\/strong> with minimum\/maximum coil dimensions, weights, and crane capacity to <strong>info@fhopepack.com<\/strong>.<\/li>\n<li><strong>Receive a proposal within 48 hours<\/strong> with complete machine engineering data, weight estimates, and duty-cycle specifications.<\/li>\n<li><strong>Book a site survey<\/strong> so our mechanical specialists can inspect your crane hook clearance, power feed, and storage footprint.<\/li>\n<\/ol>\n<h2 id=\"related-reading\">Related reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/coil-tilter-with-rotary-base\/\">Coil Tilter with 180 Degree Rotary Base<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/fully-automatic-steel-coil-packaging-line-complete-process\/\">Steel Coil Packaging Line: The Complete Process Step by Step<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/eliminating-bottlenecks-why-your-steel-processing-center-needs-an-automated-coil-stacking-line\/\">Automatic Steel Coil Stacking and Palletizing Gantry<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/Automatic-Packing-Line\/\">Automatic packing lines<\/a><\/li>\n<\/ul>\n<h2 id=\"sources\">Sources<\/h2>\n<ul>\n<li>Automatic Coil Packaging Line Specification: <a href=\"https:\/\/www.fhopepack.com\/Steel-coil-wrapping-machine\/Automatic-coil-packaging-line.html\">FHOPEpack Automatic Coil Packaging Line<\/a><\/li>\n<li>Slit Coil Packaging Line Engineering: <a href=\"https:\/\/www.fhopepack.com\/Automatic-Coil-Packing-Line\/slit-coil-packing.html\">FHOPEpack Slit Coil Packing Line<\/a><\/li>\n<li>Machine safety standards: ISO 12100:2010; EN 13155:2020 (Cranes \u2014 Non-fixed load lifting attachments)<\/li>\n<li>Magnet sizing: illustrative calculation model<\/li>\n<li>Commercial response commitment: standard engineering review (proposal within 48 hours)<\/li>\n<\/ul>\n<p><strong>Last reviewed:<\/strong> 2026-10-10<\/p>\n<p><strong>Last updated:<\/strong> 2026-10-29<\/p>","protected":false},"excerpt":{"rendered":"<p>Executive summary Electromagnetic coil lifters installed beneath overhead cranes provide safe, hook-free handling for eye-vertical (eye-to-sky) steel coils. The lifting magnet lands directly onto the upper annular face of the coil, establishes immediate magnetic flux, [&hellip;]<\/p>","protected":false},"author":5,"featured_media":11962,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Electromagnetic Steel Coil Lifter for Overhead Cranes","_seopress_titles_desc":"Our electromagnetic coil lifter picks eye-vertical steel coils on an overhead crane and holds them in a power-off test: what the clip shows and how to size 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