Rebar Tying Reel Type Detection in a Compact Internal-Space Layout
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Solution Overview
Problem
Existing rebar tying machines face issues with increased size, complex reel structures, and improper rebar tying due to the placement of detection units and information protrusions.
Innovation Solution
The rebar tying machine incorporates a detection unit positioned within the reel's internal space when attached, and uses varying protruding lengths of protrusions on the reel's information portion to identify the reel type without increasing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detection unit is positioned outside the reel on the flange outer surface, then the reel structure is simplified, but the size of the rebar tying machine increases
Solution Approach 1:
The detection unit is positioned inside the reel's first internal space, nesting the detection function within the reel structure itself. This eliminates the need for external detection components on the flange outer surface, thereby reducing the overall machine size while maintaining the reel structure simplicity.
2Measurement precision
If multiple ribs are used for type detection, then the detection accuracy is improved, but the reel structure becomes complex
Solution Approach 1:
The patent uses the protruding length of a single protrusion as a variable parameter to indicate different reel types. Instead of using multiple ribs with complex combinations, the detection unit measures the varying protruding lengths (first, second, or third length) to identify reel types, thereby achieving accurate detection with simpler structure.
3Ease of operation
If the reel can be detached and reattached while the machine is on, then the ease of operation is improved, but the reliability of rebar tying deteriorates due to wire position changes
Solution Approach 1:
The detection unit detects the reel type and wire position information before the rebar tying operation begins. When a reel is detached and reattached, the system performs preliminary detection to verify the wire position is correct before allowing operation, preventing unreliable tying due to improper wire positioning.
4Difficulty of detecting and measuring
If the information portion protrudes from the flange outer surface, then the type information is easily accessible, but the reel size increases
Solution Approach 1:
Instead of placing the information portion radially outward from the flange outer surface (increasing reel diameter), the patent positions the protrusion axially within the first internal space. This dimensional change allows the information to be accessible through the axial direction while maintaining a compact reel diameter.
Data Source
AI summary
A rebar tying machine comprises a reel including a bobbin and a wire wound on the bobbin; a reel attachment unit to which the reel is attached; a feeding unit configured to feed the wire wound on the bobbin; a guide unit configured to guide the wire around rebars; a twisting unit configured to twist the wire around the rebars; and a detection unit configured to detect a type of the reel. The bobbin includes a body portion on which the wire is wound, the body portion having a first internal space into which the reel attachment unit is inserted; and an information portion that has type information indicating the type of the reel. The detection unit is positioned in the first internal space when the reel is attached on the reel attachment unit.