Tubular Bag Machine Transverse Sealing Transfer Function Diagnosis
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Solution Overview
Problem
Existing tubular bagging machines cannot detect changes in the transfer function between the drive motor and the transverse sealing unit, which hinders error analysis and maintenance, especially after tool replacements or changes in installation conditions.
Innovation Solution
A method that involves measuring the actual position and torque of the drive motor under specified target conditions, comparing them to stored values, and repeating these measurements for different torque and position settings to detect changes in the transfer function, ensuring accurate diagnosis and preventing false errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transfer function is determined experimentally and then fixed for operation, then the sealing force can be maintained during normal production, but changes in the transfer function due to tool replacement or assembly conditions cannot be detected
Solution Approach 1:
The patent performs preliminary measurement of the actual position and torque relationship before normal production operations. By establishing the actual transfer function through measurement rather than relying on fixed experimental values, the system proactively captures the current mechanical state, enabling detection of any subsequent changes in the transfer function that may affect sealing quality
Solution Approach 2:
The patent implements a feedback mechanism where the measured actual position of the drive motor and corresponding torque values are continuously monitored and compared against reference values. This feedback loop enables real-time detection of transfer function changes, allowing the system to identify when tool replacement or assembly condition changes have occurred and alert operators accordingly
2Measurement precision
If complex sensor systems are used to directly measure sealing force, then accurate sealing force measurement is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses the drive motor's torque and position as an intermediary measurement approach. Instead of directly measuring sealing force with complex sensors, the system measures the torque applied by the drive motor and the resulting position, then calculates the sealing force indirectly through the transfer function. This intermediary method achieves accurate sealing force measurement while avoiding the complexity of direct force sensors
Solution Approach 2:
The patent replaces direct mechanical force measurement systems with an electrical measurement approach. By measuring the electrical torque output of the drive motor and correlating it with position data, the system substitutes complex mechanical force sensors with simpler electrical measurements, reducing device complexity while maintaining measurement precision
3Reliability
If the transverse sealing jaws are tested with a foil tube present, then sealing quality is maintained during testing, but the transfer function cannot be accurately measured due to variable sealing loads
Solution Approach 1:
The patent extracts the foil tube from the measurement process by performing transfer function measurements without a foil tube present. This allows the system to measure the pure mechanical relationship between drive motor torque and sealing jaw position without the confounding variable of sealing load. The foil tube is then reinserted for normal sealing operations, separating the measurement phase from the production phase
Data Source
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AI summary
The invention relates to a method for a functional check of a tubular bag machine, wherein the tubular bag machine comprises a drive controller and a plurality of electronic drive units, which are controlled independently of each other by the drive controller and which drive the different functional elements of the packaging machine clock-synchronously during execution of predefined movement sequences, and wherein one drive unit is designed in the manner of a transverse sealing unit, and wherein the transverse sealing unit comprises at least one drive motor (02) and two transverse sealing jaws (13a, 13b) which can be driven by the drive motor (02) relative to each other, by means of which transverse sealing jaws a tubular film (09) can be welded transverse to the feed direction (21), and wherein the drive torque (M) of the drive motor (02) can be indirectly or directly measured with a drive regulator, and wherein the position (φ) of the drive motor (02) can be indirectly or directly measured with a position sensor, having the following method steps: a) removing the tubular film (09) from the sealing zone between the transverse sealing jaws (13 a, 13b); b) moving the transverse sealing jaws (13a, 13b) together with specification of a desired torque stored in the drive controller; c) measuring the actual position of the drive motor (02) after the desired torque has been reached; d) comparing the measured actual position with a desired position which is stored in the drive controller and is allocated to the predefined desired torque.