Rebar Tying Wire Pull-Back for Uniform Twist Force
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Solution Overview
Problem
Existing rebar tying machines produce non-uniform twisted wire portions and varying tying forces due to increased winding diameter, leading to inefficient wire consumption.
Innovation Solution
A rebar tying machine configuration that involves feeding wire around rebars, grasping the distal end, pulling it back, and cutting it, followed by a twisting process, which reduces the winding diameter and ensures uniform twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wire is fed around the rebars without pulling it back, then the winding process is simple and fast, but the winding diameter increases leading to non-uniform twisted portions and varied tying force
Solution Approach 1:
The wire is pulled back to a predetermined position before the twisting process begins. This preliminary action reduces the winding diameter of the wire around the rebars, ensuring that the subsequent twisting produces a uniform twisted portion with consistent tying force.
2Device complexity
If the wire is fed around the rebars without pulling it back, then the process is simpler, but the amount of wire consumed increases
Solution Approach 1:
The wire pulling-back operation is performed as a preliminary step before twisting. This action reduces the winding diameter and optimizes the wire length used in each tying operation, thereby reducing overall wire consumption despite adding a minor process step.
3Manufacturing precision
If the wire is pulled back and cut after winding, then the winding diameter is reduced for uniform twisting, but the process becomes more complex
Solution Approach 1:
The wire pulling-back mechanism utilizes the existing wire feeding system to perform the pull-back operation. The wire is fed, wrapped around the rebars, then pulled back by the same feeding mechanism, and finally cut. This self-service approach minimizes additional device complexity while achieving the desired winding diameter reduction.
Data Source
AI summary
A rebar tying machine may be configured to perform: a winding process in which a wire is fed around rebars, a vicinity of a distal end of the wire is grasped, the wire is pulled back, and the wire is cut; and a twisting process in which the wire is twisted. When instructed to tie the rebars by a user, the rebar tying machine may be configured capable of performing a multiple-winding tying operation in which the twisting process is performed after the winding process has been performed multiple times.