Wrapping Machine Pre-Stretching Motor Extraction
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Solution Overview
Problem
Existing wrapping machines face limitations in productivity due to the high mass of the rotating ring, which reduces maximum rotation speed and increases costs, and suffer from complex motion transmission systems that cause delays in control and maintenance needs.
Innovation Solution
The wrapping machine design features pre-stretching motors fixed to the frame and carriage, connected through short and efficient transmission assemblies with friction rollers, allowing independent control of pre-stretching rollers and reducing the weight of the rotating ring for increased speed and precision in film tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating ring mass is reduced to increase rotation speed and productivity, then the maximum rotation speed and productivity improve, but the structural strength and stability may deteriorate
Solution Approach 1:
The pre-stretching motors are extracted from the rotating ring structure and fixed to the stationary frame instead. This removes their mass from the rotating components, significantly reducing the moment of inertia of the rotating ring while maintaining the pre-stretching function. The motors remain functionally integrated but are now stationary, allowing high rotation speeds without compromising structural integrity.
Solution Approach 2:
The system is segmented into stationary components (motors, main frame) and rotating components (rotating ring, unwinding apparatus). By separating the drive function from the rotating mass, the patent achieves independent optimization: motors provide full power while the rotating ring remains lightweight for high-speed operation.
2Measurement precision
If complex motion transmission systems are used to control pre-stretching rollers, then the control precision improves, but the system complexity and maintenance requirements increase
Solution Approach 1:
The motion transmission system is extracted and replaced with direct mounting. Pre-stretching motors are fixed directly to the frame with their drive shafts aligned to rotate the pre-stretching rollers. This eliminates intermediate transmission components (gears, belts, couplings) while maintaining precise control capability through direct motor-to-roller coupling.
Solution Approach 2:
Complex mechanical motion transmission is replaced with direct electrical-mechanical coupling. The motors electrically control the pre-stretching rollers through direct mounting, substituting multi-stage mechanical transmission with a single-stage direct drive system that is both simpler and more precise.
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
This design enhances productivity by reducing inertial forces, simplifying the structure, and enabling precise control of film tension, reducing the risk of film breakage and ensuring consistent wrapping, while minimizing maintenance requirements.
Implementation Method 1
a friction roller (13, 14) pressed against the driving ring (11, 12) by adjustment means (33, 34, 35)
Data Source
AI summary
A wrapping machine for wrapping a product with a plastic film includes a frame, a supporting ring rotatably supported by the frame and rotated around a wrapping axis by a driving device, an unwinding unit fixed to the supporting ring and supporting a reel of film, pre-stretching rollers rotating about longitudinal axes and cooperating with each other to unwind and stretch the film, and a pre-stretching motor fixed to the frame and coupled to, and arranged to rotate, the pre-stretching rollers through a respective transmission assembly. The transmission assembly includes a driving ring rotatably supported by the frame and rotated about the wrapping axis by the pre-stretching motor through a friction roller, and a driving belt wound around, and rotated by, the driving ring and coupled to one pre-stretching roller to rotate the pre-stretching rollers when the driving ring is rotated by the pre-stretching motor.