Reinforcing Bar Binding Machine Guide Pin Segmentation
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Solution Overview
Problem
Existing reinforcing bar binding machines face challenges with complex and dimensionally variable components, leading to inconsistent curl diameters, increased wear, and wire jamming issues due to complicated shapes and limited material selection, which complicates dimensional control and increases costs.
Innovation Solution
The use of simple-shaped guide pins made of high-hardness materials like carbide or ceramic, positioned accurately to ensure precise curling, along with a wearing preventive plate to reduce wear and prevent jamming, addresses the issues of inconsistent curl diameters and wire feeding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three components (guide tube end portion, wire cutting mechanism, curl guide) are used to curl the wire, then the wire can be curled and fed out, but the components have complicated shapes and easily vary in dimensions and attaching positions, causing dimensional control to be troublesome and component cost to increase
Solution Approach 1:
The wire guiding function is segmented into three separate guide pins (first guide pin for outer side, second guide pin for inner side, third guide pin for outer side) instead of using three complex components. Each guide pin is a simple cylindrical element that guides the wire at a specific point, dividing the complex guiding function into simple, manageable segments that are easier to manufacture and control dimensionally.
2Reliability
If the three components are always worn by the iron-made wire, then the components are worn and wire feeding resistance increases, but hardening the components is limited by their complicated shapes
Solution Approach 1:
The guide pins are made of high-hardness materials (such as carbide or ceramic) specifically at the wire contact portions, while the overall structure remains simple. This allows localized application of high-hardness material properties where wear resistance is needed, without requiring the entire component to have complex geometry that would limit material selection. The simple pin shape enables free selection of hard materials.
3Manufacturing precision
If one point is always disposed on the inner side of the wire, then the wire can be curled, but wire cutting swarf may remain at the guide part, causing the next wire to jam
Solution Approach 1:
The second guide pin that contacts the inner side of the wire is extracted and positioned specifically between the wire cutting mechanism and the curl guide. This strategic placement ensures that swarf generated by wire cutting is excluded from the guide part, as the guide pin creates a clearance path that prevents swarf accumulation. The harmful factor (swarf) is taken out from the critical guiding area by strategic component placement.
Data Source
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AI summary
A reinforcing bar binding machine is provided with: a guide tube 8 for guiding a wire 5 from a wire reel 4 mounted on a binding machine body 2; a curl guide 12; a wire cutting mechanism 11 disposed between the guide tube 8 and the curl guide 12; a first guide pin 23 that is disposed at an end portion of the guide tube 8 or in a vicinity of the end portion of the guide tube 8, and guides an outer side surface which is an outer side of a wire curve; a second guide pin 24 that is disposed at the end portion of the guide tube 8 or in a vicinity of the end portion of the guide tube 8, and guides an inner side surface which is an inner side of the wire curve; and a third guide pin 25 that is disposed inside of the curl guide 12 and guides the outer side surface. The wire 5 is brought into contact with the first guide pin23, the second guide pin 24, and the third guide pin 25, when the wire 5 is fed around a reinforcing bar.