Bale Strap Welding Jaw Alignment and Wear Reduction
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Solution Overview
Problem
Existing bale strapping systems using steel wires are hindered by high costs, complexity, and safety concerns, while automatic systems with thermoplastic straps face issues with wear and efficiency due to the design of moving parts and alignment requirements.
Innovation Solution
A method and system for welding thermoplastic straps around bales using a stationary and fixed weld jaw assembly with a connecting rod, crank, and adjustable components to ensure proper alignment and reduce wear, featuring a weld plane defined between the jaws and a tensioner to adjust positions and angles for improved welding consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic bale strapping systems use thermoplastic straps with moving parts and rotation mechanisms, then productivity and automation level improve, but device complexity increases and parts wear occurs leading to maintenance issues
Solution Approach 1:
The patent extracts and eliminates the wrist pin component from the weld assembly mechanism. By removing this intermediate connecting element, the system reduces the number of moving parts and potential failure points while maintaining the core functionality of strap welding, thus reducing device complexity without sacrificing productivity
Solution Approach 2:
The weld assembly is designed to perform multiple functions: welding straps, self-aligning through the elimination of the wrist pin, and accommodating variations in strap positioning. This multi-functionality reduces the need for separate alignment mechanisms, thereby reducing overall device complexity while maintaining high automation capability
2Strength
If steel wires or flat steel straps are used for bale tying, then strength and reliability improve, but weight and safety hazards increase making handling cumbersome and dangerous
Solution Approach 1:
The patent changes the material parameter from steel to thermoplastic polymer, fundamentally altering the weight characteristic while maintaining sufficient strength through the welding mechanism. This material substitution reduces weight and eliminates safety hazards associated with sharp steel edges while preserving the structural integrity needed for bale securing
3Ease of manufacture
If down-packer-type presses are used for bale strapping, then cost and ease of installation improve, but cycle time and productivity decrease compared to up-packers
Solution Approach 1:
The patent introduces dynamic adjustment capabilities to the down-packer weld assembly, allowing the mechanism to adapt its motion characteristics during operation. This dynamic behavior enables the lower-cost down-packer configuration to achieve productivity levels comparable to more expensive up-packer systems
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 system enhances the efficiency and consistency of thermoplastic strap welding, reducing wear and improving the performance of automatic bale strapping systems by compensating for unwanted loading and alignment issues, leading to better weld quality and reduced maintenance.
Implementation Method 1
causing the stationary weld jaw and the fixed weld jaw to press the two ends; a weld plane is defined between the two weld jaws
Data Source
AI summary
Bale strap assemblies for strapping a pressed bale are materials capable of being strapped are discussed herein. The bale strap assemblies account for jumping affects at the weld jaws due to reciprocating motions of the crank on the connecting rod and are adjusted by varying relative positions between the crank and the weld jaws.