Bag Tightness Detection Using Weight Sensors
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Solution Overview
Problem
Existing methods for checking the tightness of bags filled with dusty or powdery materials are unreliable, especially when filling dusty materials, as they are prone to false positives or false negatives due to dust interference and varying product properties.
Innovation Solution
A discharge device equipped with a transport device and a monitoring system that uses a weight sensor to directly detect bulk material emerging from sacks, allowing for accurate determination of sack tightness, and includes a collecting unit to catch and weigh escaped material, ensuring high reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoelectric methods are used to detect bag leaks, then dust-free areas can be monitored, but false detections occur when filling dusty materials due to dust interference
Solution Approach 1:
The patent replaces the photoelectric detection system with a mechanical weighing system. Instead of using light barriers and optical sensors that are susceptible to dust interference, the invention uses weight sensors to directly measure the mass of bulk material that escapes from bags. This mechanical substitution eliminates the measurement precision problems caused by dust particles interfering with optical detection, while maintaining reliability in detecting actual leaks.
2Ease of operation
If color change detection is used to identify leaking bags, then visual detection is simplified, but the method is limited to specific color combinations and surrounding dust affects accuracy
Solution Approach 1:
The patent replaces the optical color detection system with a mechanical weighing system. Instead of relying on color changes that are affected by dust and limited to specific color combinations, the invention uses weight sensors to measure the actual mass of escaped material. This substitution improves measurement precision by providing a direct physical measurement that is independent of optical conditions and color variations.
3Reliability
If air bubble formation under press belt is used to detect tight bags, then optical detection can be applied, but accuracy varies depending on material properties and air proportion in sacks
Solution Approach 1:
The patent extracts the detection principle from relying on material-specific behaviors (air bubble formation) and replaces it with a direct measurement of the consequence (escaped material weight). By weighing the bulk material that actually escapes from bags, the system achieves universal applicability across different materials without being influenced by variations in material properties, air content, or sack filling characteristics.
4Reliability
If existing leak detection methods are used, then bag tightness can be checked, but dusty materials cause false positives and negatives due to dust interference
Solution Approach 1:
The patent replaces all optical and visual detection systems with a mechanical weighing system. By directly weighing the bulk material that escapes from bags, the invention eliminates the harmful effect of dust interference that plagues optical methods. The weight sensor measures the actual mass of escaped material regardless of dust particles in the environment, providing reliable detection that is independent of dust conditions.
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 enables reliable and accurate detection of minor leaks in bags filled with dusty or powdery materials, preventing contamination and ensuring higher bag quality by identifying and sorting out defective bags, thus maintaining cleanliness and improving processing efficiency.
Implementation Method 1
The monitoring device has at least one weight sensor which directly detects the bulk material emerging from a sack
Data Source
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AI summary
The device (10) has a conveying device for conveying off bags i.e. valve bags (4), filled with bulk goods e.g. dusting material. A monitoring device (20) is associated with the conveying device and monitors tightness of the filled bags. The monitoring device includes a light weight sensor that directly captures escaping of the bulk goods from the bags to obtain a parameter for the bag tightness. A weighting device (15) in the conveying device is series connected to the monitoring device. A gap is formed between preceding and subsequent conveying units (12b, 12c). Independent claims are also included for the following: (1) a packaging machine for filling bulk goods into bags comprising a filling element (2) a method for filling bulk goods into bags.