Reinforcing Bar Binding Machine Tension Control
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Solution Overview
Problem
Existing binding machines for reinforcing bars struggle to maintain sufficient binding force due to loosening caused by extra wire, leading to deviation of reinforcing bars during concrete placement.
Innovation Solution
A binding machine that feeds wire in both directions, winds it around reinforcing bars, applies tension, and releases it to remove loosening, ensuring close contact and improved binding force through a mechanism involving a curl guide, induction guide, and tension applying parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire is pulled back to improve binding force, then the binding force is improved, but the loosening due to friction between the reinforcing bar and the wire cannot be sufficiently removed
Solution Approach 1:
The binding machine implements periodic action by alternating between feeding the wire in the forward direction, feeding it in the reverse direction, applying tension, and releasing tension. This cyclic process allows the wire to be pulled back multiple times with tension applied between pulls, progressively removing loosening while maintaining binding force improvement
Solution Approach 2:
The tension applying part performs preliminary action by applying tension to the wire before each reverse feeding operation. This preliminary tensioning prepares the wire to effectively remove loosening when pulled back, ensuring that the subsequent reverse feeding action achieves the desired loosening removal without compromising binding force
2Ease of operation
If the wire is wound around the reinforcing bars and twisted, then the reinforcing bars are bound, but loosening due to extra wire causes the reinforcing bars to deviate
Solution Approach 1:
The binding machine implements feedback by continuously monitoring the wire feeding process and tension application, adjusting the tension magnitude and feeding distance based on the detected loosening level. This feedback mechanism ensures that the wire is pulled back just enough to remove loosening without causing excessive deviation or compromising the binding operation
Solution Approach 2:
The periodic alternation between forward feeding, reverse feeding, tension application, and tension release creates a rhythmic binding process that progressively eliminates loosening while maintaining stable positioning of the reinforcing bars throughout the operation
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
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.