Wire Reel Brake Mechanism for Dust-Proof Rebar Binding Feed
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Solution Overview
Problem
Existing brake mechanisms for wire reels in reinforcing bar binding machines suffer from time lag in operation and are prone to failure due to exposure to environmental factors like dust and sand, which impairs the reliability of the braking operation and leads to increased wire reel rotation by inertia.
Innovation Solution
A brake mechanism is designed with a cover to conceal the driving means from the wire reel, preventing dust and sand adhesion and ensuring reliable braking performance, while a solenoid and stopper lever system with a torsion coil spring and link mechanism reduces time lag and enhances dust-proofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake lever and solenoid are exposed to the outside of the binding machine body to facilitate loading and access, then ease of operation is improved, but dust and sand can adhere to the solenoid and braking means, causing unreliable braking operation
Solution Approach 1:
The binding machine body is divided into a dust-proof enclosed space and an external loading area. The solenoid and braking means are positioned within the enclosed space, separated from external dust and sand, while the wire reel remains accessible from outside for easy loading.
Solution Approach 2:
A transmission mechanism (such as a gear or belt system) is introduced as an intermediary between the solenoid and the wire reel. This allows the solenoid to be protected inside the dust-proof enclosure while still effectively controlling the braking operation on the externally loaded wire reel.
2Reliability
If the solenoid is actuated to engage the brake lever, then braking operation is achieved, but time lag occurs until the brake operates, reducing productivity
Solution Approach 1:
The brake lever is pre-positioned and pre-loaded by a spring mechanism before the solenoid is actuated. When the solenoid activates, the brake lever is already in place and only needs to engage, significantly reducing the time lag compared to mechanisms that must first position the brake lever from a neutral position.
Solution Approach 2:
The complex mechanical linkage system is replaced with a direct electromagnetic actuation system. The solenoid directly engages the brake lever through a simplified mechanical connection, eliminating multiple intermediate linkages that cause time lag, while maintaining reliable braking control.
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 ensures reliable braking without adhesion issues, maintaining wire reel loading properties and improving dust-proofing, thus preventing unnecessary wire reel rotation and ensuring smooth wire feeding.
Implementation Method 1
the brake lever is actuated by a solenoid
Implementation Method 2
a solenoid and stopper lever system with a torsion coil spring and link mechanism reduces time lag
Implementation Method 3
the brake lever is actuated... so as to engage the peripheral edge of the wire reel, thereby stopping rotation of the wire reel
Data Source
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AI summary
A reinforcing bar binding machine is provided with a feed means (13, 14) for feeding a wire from a wire reel (20) rotatably mounted on a binding machine body (11), a braking means (30) for braking a rotation of the wire reel (20), and a control means (50) that starts a braking to the rotation of the wire reel (20) by the braking means (30) after the wire is fed to a predetermined amount by the feed means (13, 14).