Laminated Ladle Hook Using Barrel Nuts
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Solution Overview
Problem
Traditional hot riveting processes for laminating hooks result in thermal stress, loosened connections, and damage to rivets, compromising the security and longevity of below-the-hook lifting devices, especially when handling heavy or hot materials.
Innovation Solution
A laminated hook formed using a plurality of plates secured with barrel nuts and bolts, which provide a tighter compression and bound fit, eliminating the need for welding and allowing for easier repair, and are manufactured from 1018 cold drawn steel with specific tensile, yield, and shear strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot riveting process is used to laminate hook plates, then the plates are secured together, but thermal stress is generated and rivet engagement is compromised
Solution Approach 1:
The patent replaces the hot riveting mechanical system with a cold bolting system using high-strength bolts and nuts. This substitution eliminates thermal stress generation while maintaining plate securing functionality through mechanical fastening alone, directly resolving the contradiction between achieving strong connections and avoiding thermal damage.
Solution Approach 2:
The patent changes the temperature parameter from hot (thermal riveting) to cold (bolting operation), fundamentally altering the process conditions. By using cold-drawn steel bolts with specified tensile, yield, and shear strengths, the system achieves equivalent or superior connection strength without introducing thermal stress that compromises rivet engagement.
2Stability of the object's composition
If hot riveting is used to secure plates, then plates are laminated together, but rivets are damaged and connection becomes loosened
Solution Approach 1:
The patent replaces the hot riveting mechanical system with a cold bolting system using high-strength bolts and nuts. This substitution eliminates thermal stress generation while maintaining plate securing functionality through mechanical fastening alone, directly resolving the contradiction between achieving strong connections and avoiding thermal damage.
Solution Approach 2:
The patent employs high-strength bolts and nuts that can be easily replaced if damaged or loosened, compared to rivets which require destructive removal and re-riveting. The bolted connection allows for maintenance and replacement without compromising the overall structure, improving reliability through ease of repair.
3Strength
If welding is required for laminated hooks, then structural integrity is achieved, but repair complexity increases
Solution Approach 1:
The patent segments the fastening system into separate, replaceable components (bolts and nuts) rather than creating a monolithic welded structure. This segmentation allows individual fasteners to be replaced without affecting the entire hook assembly, dramatically improving ease of repair while maintaining structural integrity through the distributed fastening system.
Solution Approach 2:
The patent creates a dynamic, adjustable fastening system where bolts can be loosened, removed, replaced, or tightened as needed. This contrasts with static welded joints that require cutting and rewelding for repair. The bolted connection system adapts to maintenance needs, allowing quick structural restoration without complex welding procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The laminated hook maintains a tighter compression of plates, prevents shifting, and offers better resistance to side loads, extending the lifespan and improving maintenance by allowing for easy replacement of bolts, while eliminating the thermal stress issues of hot riveting.
Implementation Method 1
at least one set of the aligned holes between the plurality of plates are fitted with a nut and with a bolt to secure the plurality of plates together to form the laminated hook
Implementation Method 2
the receiving portion of the barrel nut and the insertable end of the bolt are fastened together with corresponding threads on the receiving portion of the barrel nut and the insertable end of the bolt
Data Source
AI summary
The present disclosure relates to laminated hook including a fastening system. The hook is formed by a plurality of plates laminated together with a mechanical fastening system. The fastening system utilized to laminate the plates together to form the laminated hook includes a bolt and a nut. According to certain aspects of the present teaching, the nut is a barrel nut. According to further aspects of the present teaching, the hook is a laminated ladle hook. A process for forming a laminated hook is also provided.