Rebar Binding Machine Tension Control to Prevent Wire Loosening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing binding machines for reinforcing bars struggle to apply sufficient tension to wires, leading to loosening and requiring increased motor outputs and device size, which compromises handling properties.
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, applying tension between 10% and 50% of the wire's maximum tensile load to secure the wire around reinforcing bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tension to be applied to the wire is increased to remove loosening, then the binding force is improved, but the size of the motor and the entire device must be increased, which deteriorates handling properties
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tension parameter within the range of 10% to 50% of the wire's maximum tensile load. This optimized parameter range achieves sufficient binding force to remove loosening while avoiding excessive tension that would require larger motors and devices, thereby maintaining good handling properties.
2Strength
If the outputs of the motor configured to feed the wire and the motor configured to actuate the binding unit are increased to improve the binding force, then the tension to be applied to the wire is increased, but the size of the motor and the entire device must be increased
Solution Approach 1:
The patent resolves this contradiction by changing the tension parameter to an optimized range (10%-50% of maximum tensile load) that achieves the required binding force without requiring excessive motor output. This allows the use of compact motors and a smaller overall device while still ensuring sufficient binding strength.
3Strength
If the tension to be applied to the wire is increased to remove loosening, then the binding force is improved, but it is inevitable to increase a size of the motor and a size of the entire device
Solution Approach 1:
The patent applies parameter changes by limiting the tension to 10%-50% of the wire's maximum tensile load. This optimized parameter selection achieves the necessary binding force to eliminate loosening while avoiding the need for high-tension motors that would increase device weight, thereby maintaining portability and ease of handling.
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 effectively removes loosening due to wire excess, ensures close contact between wire and reinforcing bars, and prevents careless cutting, while suppressing unnecessary motor outputs and device size increases, thereby improving handling properties.
Implementation Method 1
a tension applying part configured to perform, in the second operation area, an operation of applying 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, and to move in the axis direction and to twist the wire in a second operation area in the axis direction; a rotation regulation part; and a tension applying part configured to perform, in the second operation area, an operation of applying tension on the wire engaged by the wire engaging body in the first operation area. The tension applied to the wire is equal to or larger than 10% and equal to or smaller than 50% with respect to a maximum tensile load of the wire.