Rebar Binding Machine Tensioning to Remove Wire Loosening
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Solution Overview
Problem
Existing reinforcing bar binding machines face challenges in securing sufficient binding force due to friction between reinforcing bars and wires, leading to loosening and deviation issues during concrete placement.
Innovation Solution
A binding machine with a wire feeding unit, curl forming unit, cutting unit, and binding unit that includes a rotary shaft, wire engaging body, rotation regulation part, and tension applying part to apply and release tension on the wire, ensuring it is closely contacted to the reinforcing bars, thereby enhancing the binding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire is pulled back to remove loosening, then the binding force should be improved, but the friction force between reinforcing bar and wire prevents sufficient removal of loosening
Solution Approach 1:
The tension applying part applies tension to the wire before the binding unit twists the wire. This preliminary tensioning action removes loosening caused by extra wire parts before the final binding operation, ensuring the wire is tightly contacted to the reinforcing bars from the outset, thereby overcoming the friction force issue.
Solution Approach 2:
The wire engaging body is configured to move in the axis direction of the rotary shaft, allowing dynamic adjustment of wire engagement. The tension applying part dynamically applies and releases tension during the binding process, enabling the system to adapt to the friction force between the wire and reinforcing bar while maintaining effective binding force.
2Ease of operation
If the wire engaging body rotates with the rotary shaft to twist the wire, then the binding function is achieved, but the loosening from extra wire parts cannot be removed
Solution Approach 1:
The tension applying part performs tension application before the wire engaging body rotates to twist the wire. This preliminary action removes loosening from extra wire parts in advance, ensuring that when the twisting operation occurs, the wire is already tightly contacted to the reinforcing bars, thereby achieving both ease of operation and sufficient binding force.
Solution Approach 2:
The binding unit combines continuous actions: the tension applying part continuously applies tension while the wire engaging body rotates to twist the wire. This continuous combination of tensioning and twisting ensures that the wire remains tightly contacted throughout the binding process, maintaining both operational ease and binding strength.
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 machine effectively removes loosening caused by extra wire parts, improving the binding force and maintaining the position of reinforcing bars during concrete placement.
Implementation Method 1
a tension applying part configured to perform, in the second operation area, operations of applying tension and releasing the applied tension on the wire engaged by the wire engaging body in the first operation area
Data Source
AI summary
A binding machine includes: a wire feeding unit; a curl forming unit; a butting part; a cutting unit; and a binding unit. The binding unit includes a rotary shaft; a wire engaging body configured to move in an axis direction of the rotary shaft and to engage the wire in a first operation area in the axis direction of the rotary shaft, and configured to move in the axis direction of the rotary shaft and to twist the wire with rotating together with the rotary shaft in a second operation area in the axis direction of the rotary shaft; a rotation regulation part configured to regulate rotation of the wire engaging body; and a tension applying part configured to perform, in the second operation area, operations of applying tension and releasing the applied tension on the wire engaged by the wire engaging body in the first operation area.