Packaging Machine Damping Elements for Vibration Isolation
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Solution Overview
Problem
Existing packaging machines experience vibration issues during high-speed film folding, which compromises the accuracy of weighing articles, especially when packaging at speeds exceeding 35 articles per minute, due to the rapid movement of folding plates and the transmission of mechanical vibrations to the machine frame.
Innovation Solution
The integration of damping elements between the folding mechanism's lateral and rear slides and the machine frame, which absorb shear and compressive forces, preventing the transmission of vibrations and ensuring precise weighing by reducing vibration transmission by at least 50%. This is achieved through a design featuring rubbery-elastic damping material between metal plates and a stable, reversible fastening system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the folding mechanism operates at high speeds to increase packaging productivity, then packaging speed is improved, but mechanical vibrations are transmitted to the machine frame causing weighing inaccuracy
Solution Approach 1:
The patent introduces damping elements as intermediary components between the folding mechanism and the machine frame. These damping elements absorb and dissipate mechanical vibrations generated by rapid folding plate movement, preventing vibration transmission to the weighing device while allowing the folding mechanism to operate at high speeds for increased productivity
Solution Approach 2:
The patent converts the harmful mechanical vibrations into beneficial damping effects by using viscoelastic materials that transform vibration energy into heat through internal friction. This allows the system to maintain high-speed operation while protecting the weighing accuracy by dissipating the harmful vibrations through controlled energy conversion
2Stability of the object's composition
If rigid fastening is used to ensure structural stability, then machine stability is improved, but vibrations are transmitted to the weighing device
Solution Approach 1:
The patent employs composite damping elements consisting of viscoelastic material layers bonded between rigid metal plates. This composite structure combines the stiffness and stability-providing properties of metal with the vibration-damping properties of viscoelastic materials, achieving both machine stability and vibration isolation to protect weighing accuracy
Solution Approach 2:
The patent changes the mechanical parameters of the fastening system by replacing purely rigid connections with semi-rigid damping connections. The damping elements have frequency-dependent stiffness characteristics that provide rigid support at low frequencies for stability while absorbing high-frequency vibrations that would affect weighing measurements
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 significantly enhances the precision of weighing by minimizing vibration transmission, allowing for accurate weight measurement even at high packaging speeds, ensuring compliance with special calibration requirements and maintaining machine stability.
Implementation Method 1
at least one damping element which is designed in such a way that it prevents or at least dampens transmission of mechanical vibrations of the lateral slides and of the rear slide to the machine frame
Implementation Method 2
a design featuring rubbery-elastic damping material between metal plates
Data Source
AI summary
A packaging machine for packaging articles with a stretchable film includes: a weighing device, which is rigidly fastened to a machine frame, for determining a weight of an article; a film transport device, which is fastened to the machine frame, with a belt conveyor for transporting the film to the article to be packaged; and a folding mechanism for folding the film. The folding mechanism having: two lateral slides that push the film left and right under the article to be packaged; and a rear slide which pushes the film from behind under the article to be packaged. The lateral slides and the rear slide are fastened to the machine frame via at least one damping element which is designed in such a way that it prevents or at least dampens transmission of mechanical vibrations of the lateral slides and of the rear slide to the machine frame.