Strap Tension Damping in Strapping Machines to Prevent Damage
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Solution Overview
Problem
Existing strapping machines face challenges in adjusting to different materials and sizes of straps, leading to issues such as strap damage, slipping, or pinching, due to friction and torque changes during the strapping process.
Innovation Solution
A strapping machine with a movable assembly, detection bracket, and adjustable damping component to control strap tension, allowing for easy adjustment of tightening force without needing torque detection, and a split structure to prevent interference and scratching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tightening mechanism clamps the strap too tightly, then the strap is secured firmly, but the strap is damaged and marks are left on the strap
Solution Approach 1:
The patent replaces the fixed torque motor system with a dynamic friction-based retracting mechanism. The retracting roller applies controlled friction to the strap, allowing the strap to be retracted smoothly without excessive force. This dynamic approach adapts to different strap materials and thicknesses, preventing damage while maintaining securing effectiveness.
Solution Approach 2:
The patent substitutes the motor-driven torque control system with a passive friction-based mechanical system. Instead of using a motor to control retracting force, the system uses the friction between the retracting roller and the strap to control the retraction force, eliminating the need for torque detection and adjustment.
2Object-affected harmful factors
If the tightening mechanism does not clamp the strap tightly, then the strap is not damaged, but the strap slips and is not secured properly
Solution Approach 1:
The friction-based retracting mechanism provides continuous contact with the strap during retraction, maintaining consistent friction force that prevents slipping. The retracting roller follows the strap throughout the process, ensuring adequate tension without localized excessive force that could cause damage.
Solution Approach 2:
The system replaces active motor control with passive friction control, where the friction between the roller and strap naturally regulates the retraction force. This eliminates the need for complex torque detection and adjustment mechanisms while maintaining reliable strap securing.
3Reliability
If the strap retracting motor torque is increased to prevent strap slipping, then the strap is secured more reliably, but the strap is damaged and marks are left on the strap
Solution Approach 1:
The patent eliminates the motor-driven retracting system entirely and replaces it with a friction-based passive retraction system. The retracting roller uses friction to control the retraction process without requiring torque control, thereby avoiding strap damage while maintaining securing reliability.
Solution Approach 2:
The retracting roller acts as an intermediary between the strap and the retraction mechanism. It transfers the retraction force through friction contact, distributing the force along the strap and preventing concentrated excessive force that would cause damage.
4Adaptability or versatility
If the tightening mechanism is adjusted for different strap materials and sizes, then the strap can be secured properly for various materials, but the adjustment process is complex and time-consuming
Solution Approach 1:
The patent replaces the motor-driven system requiring torque adjustment with a friction-based system that naturally adapts to different strap materials. The friction coefficient between the roller and strap automatically adjusts the retraction force, eliminating the need for manual torque detection and mechanism adjustment.
Solution Approach 2:
The friction-based retracting mechanism self-adjusts to different strap materials and thicknesses through the natural variation in friction coefficients. The system automatically adapts to the specific strap being used without requiring operator intervention for adjustment, simplifying operation and reducing complexity.
5Ease of operation
If the friction force of the strap in the looping mechanism is reduced to prevent slipping, then the strap can be retracted smoothly, but the strap tightness is compromised
Solution Approach 1:
The patent implements a dynamic friction-based retracting mechanism where the retracting roller maintains continuous contact with the strap. The friction force is applied progressively during retraction, ensuring both smooth operation and adequate final tightness without requiring excessive friction that would cause slipping.
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 provides stable and accurate strapping without damaging the strap, improves universality, and reduces costs by simplifying the retracting mechanism and eliminating the need for torque detection.
Implementation Method 1
a detection bracket, which is rotatably or movably mounted on the frame; and the detection bracket is provided with a damping component that provides a certain resistance to the detection bracket
Implementation Method 2
This scheme uses the friction force of the strap clamped by the strap retracting roller to retract the strap
Data Source
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AI summary
The present invention belongs to the technical field of strapping machines, and particularly refers to a strapping machine and strapping method thereof. The strapping machine comprises a frame (1), a strap storage mechanism (10), a looping mechanism (20), a tightening mechanism (30), a welding mechanism (40) and a strap cutting mechanism (50); the tightening mechanism comprises a movable assembly (103), a detection roller (104), a detection bracket (105), a damping component (107) and a trigger device (106); the movable assembly first retracts the strap in the strap retracting process, then drives the detection bracket through the strap in tension, and the reel of the strap storage mechanism switches to the rotating state from the locked state, achieving the scheme of strap storage after strap retracting; when the detection bracket moves, the trigger device indirectly or directly controls the reel to release the strap; this design enables the tension of the strap during the strapping process to be controlled by the damping component, and the overall strap retracting structure is simplified; and the tightening force of the strap can be conveniently adjusted as needed, thereby improving the universality and use convenience of the strapping machine.