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Past Turnkey ProjectsDesign and Manufacturing of a Backup Roll Lifter for the Steel IndustryDesign and Manufacturing of an Inconel Coil Lift Beam for the Steel IndustryDesign and Manufacturing of a Motorized Drum Lifter for the Steel IndustryField Inspection of Lifting Devices for the Steel IndustryDesign and Manufacturing of Motorized Ring Tong for the Ring Forging IndustryDesign and Manufacturing of a hydraulic Sheet Lifter for the Metal Processing IndustryRepair of Straddle Carrier for the Heavy Steel IndustryRepair, Modification, and Certification of Double Grip Coil Tong for the Silicon Steel Industry
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Modification and Repair of Double Grip Coil Tong for the Silicon Steel Industry

Repair of Double Grip Coil Tong
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Repair of Double Grip Coil Tong
 

A double grip vertical coil tong had been experiencing failures during operation which included; pins failure, inner lever failure, finished coil damage, and excessive clevis wear. Our customer sent the lifter to us with hopes we could redesign the device to eliminate the problems.

Hunter Lift observed the tong in use to gain a good understanding of how the lifter was being used. We were able to draw upon our many years of expertise to evaluate and determine what was causing some of the issues. Our engineers performed calculations and Finite Element Analysis to examine and locate high stress areas within the tong components.

The repairs and modification to the vertical tong lifter included:

  • Increased boss sizes to reduce bending stress in loaded pins
  • Clevis plates were changed from plain carbon steel to high strength alloy steel to reduce wear
  • Stronger springs were added to aid in the operation of the lifter
  • Redesign of the shoes to increase contact area and reduce marking on finished coil surfaces

The re-engineering of the double grip vertical coil tong has resulted in lower repair cost and less down time for maintenance.

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Project Highlights for Modification and Repair of Double Grip Coil Tong

Product NameDouble Grip Coil Tong
Product DescriptionOur client’s double grip vertical coil tong had continuous failures and was causing damage to the product, so it was sent to Hunter Lift for evaluation and subsequent repair and modifications
IssuesPin Breakage
Inner Lever Failure
Finished Coil Marking
Excessive Clevis Wear
Tong Sticking During Operation
Capabilities Applied/ProcessesEngineering Evaluation
  • Determine What was Causing These Issues
  • Utilized Finite Element Analysis (FEA) to Examine and Locate High Stress Areas
Repair and Modification
  • Increased Boss Sizes to Reduce Bending Stress in Loaded Pins
  • Clevis Plates Changed from Plain Carbon Steel to high Strength Alloy Steel to Reduce Wear
  • Stronger Springs Added to Aid the Operation of the Lifter
  • The Shoes Were Redesigned and enlarged to Increase the Contact Area Reducing Marking on Coil Surfaces
BenefitsLower Repair Costs, Less Downtime for Maintenance, ability to move hotter coils out of annealing without increasing damage
Weight Capacity16,000 pounds
Industry for UseSilicon Steel
Delivery Time10 weeks
Standards MetASME B30.20
ASME BTH-1
AWS D14.1
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