Rebar Binding Machine Wire Pull Sequence for Low-Friction Winding
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Solution Overview
Problem
Existing reinforcing bar binding machines face issues with securely winding wires around reinforcing bars due to increased friction, which prevents sufficient pulling back of the wire in the reverse direction, leading to potential deviations of the bars during concrete placement.
Innovation Solution
A binding machine with a curl guide and a pulling unit that engages the wire on one side and pulls it towards the object first, reducing friction and allowing secure winding by pulling the wire on the opposite side, which is less susceptible to friction, thereby ensuring effective binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wire is fed in the reverse direction and wound on the reinforcing bars, then the binding is strengthened, but the friction between the wire and reinforcing bars increases, preventing the wire from being sufficiently pulled back
Solution Approach 1:
The wire feeding process is segmented into two distinct phases: forward feeding to position the wire, and reverse feeding to wind the wire. The pulling unit is also segmented to selectively pull different portions of the wire at different times, allowing the tip end-side wire to be pulled first (when friction is lower) before the base-side wire is pulled (when friction is higher).
Solution Approach 2:
The pulling unit performs a preliminary action by pulling the tip end-side wire toward the object before pulling the base-side wire. This preliminary pull occurs when the wire portion along the nose has not yet contacted the object, minimizing friction. This prepares the wire for the subsequent winding action by reducing the initial friction resistance.
2Manufacturing precision
If the wire along the nose is moved toward the reinforcing bars, then the wire engagement is improved, but the friction increases and prevents sufficient wire pullback
Solution Approach 1:
The pulling unit performs a preliminary action by pulling the tip end-side wire toward the object before pulling the base-side wire. This preliminary pull occurs when the wire portion along the nose has not yet contacted the object, minimizing friction. This prepares the wire for the subsequent winding action by reducing the initial friction resistance.
Solution Approach 2:
Instead of pulling the wire in the conventional sequence (base-side first, then tip end-side), the invention inverts the sequence by pulling the tip end-side wire first, then the base-side wire. This reverse sequence exploits the friction difference between the two wire portions, allowing effective pullback despite the friction increase when the wire contacts the object.
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 solution enables secure winding of wires around reinforcing bars, preventing deviations and ensuring firm binding, even in the presence of increased friction, thus maintaining the position of the bars during concrete placement.
Implementation Method 1
When the wire of the portion along the nose is moved to a position in which it is in contact with the reinforcing bars, the friction between the wire and the reinforcing bars increases the load of feeding the wire in the reverse direction.
Implementation Method 2
the friction between the wire and the reinforcing bars increases the load of feeding the wire in the reverse direction
Data Source
AI summary
A binding machine includes: a wire feeding unit configured to feed a wire; a curl guide configured to curl the wire fed in a forward direction by the wire feeding unit; and a binding unit configured to twist the wire fed in a reverse direction by the wire feeding unit and wound on an object. The binding unit includes a wire engaging body configured to engage a tip end-side of the wire fed in the forward direction by the wire feeding unit, curled by the curl guide and wound around the object. The binding machine includes a pulling unit for pulling, toward the object, a wire on a second side positioned on an opposite side to the curl guide with respect to the object earlier than a wire on a first side positioned on the curl guide of the wire wound around the object and engaged at its tip end.