Transverse Welding Assembly Torque Motor Direct Drive
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Solution Overview
Problem
Flow-pack packaging machines with transverse welding assemblies using gear transmissions are noisy, require frequent maintenance for clearance recovery due to wear, and pose contamination risks when lubricated, especially when packaging foodstuffs.
Innovation Solution
A transverse welding assembly utilizing torque motors with direct transmission and cardan shafts, eliminating the need for gears, and employing pre-loaded tapered bearings and lamellae joints to maintain precise alignment and reduce torsional clearances, allowing for quieter operation and reduced maintenance, while avoiding lubrication for foodstuff compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gear transmission is used to drive welding shafts, then motion transmission is achieved, but noise increases and maintenance frequency increases due to wear
Solution Approach 1:
The patent removes the gear transmission system entirely from the welding assembly, replacing it with direct motor-to-shaft coupling. This extraction of the harmful gear mechanism eliminates the source of noise and wear-based maintenance requirements while maintaining the essential function of driving the welding shafts.
Solution Approach 2:
The patent replaces the mechanical gear transmission system with a direct drive electrical motor system. This substitution eliminates the intermediate mechanical components (gears, shafts, bearings) that generate noise and require maintenance, using electromagnetic fields for motion transmission instead.
2Ease of operation
If gears are used for motion transmission, then welding shafts can be driven, but periodic maintenance is required for clearance recovery
Solution Approach 1:
The patent extracts the gear transmission components that require periodic maintenance for clearance recovery. By removing gears, shafts, and bearings from the drive system, the patent eliminates the need for routine maintenance interventions while preserving the motion transmission function through direct motor coupling.
3Reliability
If lubrication is applied to gears, then friction is reduced, but contamination risk increases for foodstuff packaging
Solution Approach 1:
The patent replaces the lubricated mechanical gear system with a direct drive motor system that has no intermediate moving parts requiring lubrication. This substitution eliminates the contamination risk associated with grease and oil while maintaining efficient motion transmission through electromagnetic fields.
4Ease of operation
If gearboxes are used, then motion control is achieved, but device complexity increases
Solution Approach 1:
The patent removes the entire gearbox assembly and associated transmission components from the welding mechanism. This extraction simplifies the device structure significantly, reducing the number of parts, assembly steps, and potential failure points while maintaining precise motion control through direct motor drive.
Data Source
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AI summary
A transverse welding device for a flow-pack packaging machine, comprising: - a stationary support structure (12), - a pair of welding shafts (18, 20) rotatably carried by the support structure (12) about respective axes (A, B) parallel to each other, - a pair of torque motors (26, 28), and - a pair of cardan shafts (34, 36) each of which has a first end (56) directly fixed to the rotor (38, 40) of a respective torque motor (26, 28) and a second end (58) directly fixed to a respective welding shaft (18, 20).