Wire Tying Machine Lid Sensing for Safe Spool Reloading
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Solution Overview
Problem
Existing automatic wire tying machines for rebars lack effective mechanisms to prevent accidental operation during spool replacement, leading to potential tangling of wires and personal injury risks.
Innovation Solution
A wire tying machine with a sensor arrangement that detects the position of the lid, enabling the control unit to set the machine in a normal running or reload state based on the lid's position, ensuring safe and efficient wire feeding and knot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lid is opened to replace the wire spool, then the wire spool can be replaced, but the risk of accidental operation and wire tangling increases
Solution Approach 1:
The control unit is programmed in advance to check the lid position status before allowing trigger operation. When the lid is opened, the system proactively disables knot-tying function and switches to feed-only mode, preventing accidental operation before it can occur.
Solution Approach 2:
The sensor arrangement continuously monitors the lid position and provides real-time feedback to the control unit. This feedback mechanism enables the system to automatically adjust its operational state based on whether the lid is closed or open, ensuring safety without compromising spool replacement ease.
2Ease of operation
If the trigger is activated during spool replacement, then wire feeding can occur, but knot formation may cause wire tangling and injury
Solution Approach 1:
The system dynamically changes its operational characteristics based on lid position. When the lid is open, the trigger activation produces a different outcome (feed-only mode) compared to when the lid is closed (normal knot-tying mode), allowing the machine to adapt its behavior to the current operational context.
Solution Approach 2:
The control unit changes the operational parameters of the wire tying machine based on lid position detection. In feed-only mode, the parameters for knot formation are disabled while wire feeding parameters remain active, eliminating the harmful effect of wire tangling during spool replacement.
3Reliability
If a sensor arrangement and control unit are added to detect lid position, then operational safety is improved, but device complexity increases
Solution Approach 1:
The sensor arrangement serves multiple functions: it detects lid position, triggers safety mode activation, and enables the control unit to adjust operational parameters. This multi-functionality reduces the need for separate dedicated components for each safety function, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The control unit automatically manages the operational state changes based on sensor feedback without requiring additional external control systems or complex safety interlock mechanisms. The system self-regulates its behavior based on the detected lid position, simplifying the overall control architecture.
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
Reduces the risk of wire tangling and personal injury during spool replacement by differentiating trigger functions based on lid position, simplifying the loading process, and maintaining operational safety.
Implementation Method 1
The sensor arrangement comprises a first magnet and a hall-sensor element arrangement which are adapted to be separated when the lid is brought from the closed position to the opened position. The hall-sensor element arrangement is adapted to measure a magnetic field generated by the magnet
Implementation Method 2
the wire tying machine further comprises a first metal pad that is adapted to attract the first magnet such that the lid is adapted to be retained in the closed position by means of magnetic attraction force between the first magnet and the first metal pad
Data Source
AI summary
The present disclosure relates to a wire tying machine (100) adapted to tie wire knots (153) that secure reinforcement bars (105, 106) together. The wire tying machine (100) comprises a lid (160, a main body part (102), a trigger (140) and a spool compartment (155) that is adapted to accommodate a wire spool 5 150 comprising a length of wire (151) behind the lid (160). The wire tying machine (100) is arranged to feed (110) a free end (152) of the wire (151) out from an opening in a tying head (101) of the wire tying machine (100). The wire tying machine (100) comprises a control unit arrangement (130) and a sensor arrangement (120), where the sensor arrangement (120) is adapted to detect if the lid (160) is in a closed position (A) or in an opened position (B), and to output a signal to the control unit arrangement (130), which signal is indicative of if the lid (160) is in the closed position (A) or in the opened position (B).