Roll Stand Guide Fastening with Sacrificial Breakaway Bolts
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Solution Overview
Problem
Existing roll stands suffer significant damage during accidents when rolled stock collides with intake or output guides, leading to costly repairs and prolonged downtime due to the transmission of impact forces.
Innovation Solution
The use of necked-down bolts with predetermined breaking points as fasteners for attaching intake and output guides to the roll stand, allowing the guides to detach safely during collisions and preventing damage to the roll stand and surrounding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake guide and output guide are firmly attached to the roll stand, then the guides can effectively guide the material during normal operation, but significant damage occurs to the roll stand and guides during accidents due to impact force transmission
Solution Approach 1:
The connection between the guide and roll stand is segmented into a removable fastener system. The fastener consists of a bolt with a predetermined breaking point (necked-down region) that separates the guide from the roll stand during excessive impact, preventing damage while maintaining connection during normal operation.
Solution Approach 2:
The fastener is pre-designed with a predetermined breaking point at a specific location on the bolt. This preliminary structural weakness is intentionally created so that during an accident, the fastener breaks at the predetermined point rather than allowing damage to propagate to the roll stand or guide.
2Strength
If strong fasteners are used to securely attach the guides, then the connection is durable during normal operation, but repair costs and downtime increase significantly after accidental damage
Solution Approach 1:
The fastener is designed as a sacrificial component with a predetermined breaking point. During accidents, the fastener breaks and can be easily replaced, while the expensive roll stand and guide remain intact. This makes the fastener a disposable protective element that is inexpensive compared to the components it protects.
Solution Approach 2:
The fastener acts as an intermediary between the guide and roll stand. It provides strong connection during normal operation but is designed to fail in a controlled manner during accidents, mediating the impact forces and protecting the permanent structures from damage.
3Object-affected harmful factors
If the fasteners are designed with a predetermined breaking point, then damage during accidents is minimized, but the connection strength during normal operation is reduced
Solution Approach 1:
The fastener has non-uniform cross-section with a predetermined breaking point (necked-down region) at a specific location. The breaking point has reduced strength locally, while the rest of the fastener maintains full strength for normal operation. This local quality variation allows the fastener to be strong when needed and weak when needed.
Data Source
AI summary
The invention relates to a roll stand (1) with a number of rollers (2, 3) and with an incoming guide (4) and/or an outgoing guide (5) which is/are fixed on the roll stand (1) before or after the rolling gap (6) in the rolling direction (W), respectively, and which is/are adjustably arranged in the direction perpendicular to the axis (7) of the rollers (2, 3) and perpendicular to the rolling direction (W), particularly in the vertical direction (V). To minimize damage in case of an accident, the invention provides for a predetermined breaking point (9) in the fixing means which fixes the incoming guide (4) and/or the outgoing guide (5) on the roll stand (1).