Weighing Container Blocks Access in Plastic Granulate Metering
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Solution Overview
Problem
Existing granulate dosing systems for plastics processing machines require large spaces due to enclosures for safety, which restricts movement during maintenance and cleaning, and are not compact enough for cramped installations like extrusion systems.
Innovation Solution
The weighing container is designed to block access to dosing elements and the mixer inlet, with a safety switch on the frame that emits a switch-off signal when the weigh hopper is removed, eliminating the need for a housing and door, thus providing access protection directly through the weighing container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an enclosure with a door is used to secure the dosing system, then safety protection is improved, but the space requirement increases
Solution Approach 1:
The patent extracts the safety protection function from the enclosure structure and relocates it to the weighing container itself. The weighing container is designed with a blocking feature that prevents access to dosing elements when in the operating position, eliminating the need for a separate enclosing housing while maintaining safety protection.
Solution Approach 2:
The weighing container is given multiple functions: it serves both as the weighing vessel for measuring granulate and as the safety protection mechanism by blocking access to dosing elements. This multi-functionality eliminates the need for a separate safety enclosure, reducing space requirements.
2Reliability
If a large enclosure is used for safety protection, then access protection is improved, but the freedom of movement during maintenance is reduced
Solution Approach 1:
The system is segmented into a removable weighing container and a stationary frame. The weighing container can be easily removed from the frame to provide access to dosing elements for maintenance, while the frame remains in place. This segmentation allows operators to access internal components without navigating around a large enclosing housing.
3Area of stationary object
If the housing dimensions are reduced for compactness, then space requirement is improved, but the freedom of movement during maintenance is restricted
Solution Approach 1:
The weighing container is designed to be dynamically removable from the frame. During operation, it provides safety protection by blocking access. During maintenance, it can be easily removed to provide unobstructed access to dosing elements. This dynamic configuration allows the system to be compact during operation while providing full access during maintenance.
Data Source
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AI summary
A granule-dosing system for plastics processing machines including a weighing container removably retained in an operating position on a framework; a plurality of supply containers having outlets which are connected to an inlet of the weighing container via dosing mechanisms; a mixer with an inlet which is connected to an outlet of the weighing container; and a safety switch and a control device designed to switch off the dosing mechanisms and/or the mixer when the safety switch emits a switch-off signal, wherein the weighing container is configured such that, in the operating position, it blocks access to the dosing mechanisms and/or to the inlet of the mixer, and the safety switch is arranged on the framework such that it emits the switch-off signal when the weighing container is removed from the operating position.