Conveyor Belt Scale Weighing Cell External Access
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Solution Overview
Problem
Conveyor belt scales in power plants face challenges with dusts that have a tendency toward uncontrolled explosions, making it difficult to access weighing cells within pressure-proof housings for maintenance and causing measurement errors due to high temperatures.
Innovation Solution
A pressure-resistant, explosion-protected housing surrounds the conveyor belt with a rod system using elastic bearings for external access to the weighing cell, positioned outside the housing to prevent uncontrolled explosions and temperature exposure, enhancing measurement accuracy and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the weighing cell is positioned inside the pressure-resistant housing, then the system provides explosion protection, but the weighing cell becomes difficult to access for maintenance and is exposed to high temperatures causing measurement errors
Solution Approach 1:
The system is divided into two functional zones: the pressure-resistant housing containing the conveyor belt and dust-prone components, and the external area containing the weighing cell. This segmentation allows the weighing cell to be accessible while the housing provides explosion protection for the hazardous zone.
Solution Approach 2:
The weighing cell is extracted from the pressure-resistant housing and positioned externally. A rod system with elastic bearings and pressure-resistant seals transfers the force from the conveyor belt inside the housing to the weighing cell outside, maintaining both protection and accessibility.
2Device complexity
If the weighing cell is positioned inside the pressure-resistant housing, then the structure is simplified, but the weighing cell is exposed to high temperatures causing measurement errors
Solution Approach 1:
The temperature-sensitive weighing cell is extracted from the high-temperature zone inside the housing. The rod system with elastic bearings and seals extends the force transmission mechanism externally, isolating the weighing cell from thermal effects while maintaining structural functionality.
Solution Approach 2:
The rod system with elastic bearings acts as an intermediary between the conveyor belt inside the housing and the weighing cell outside. This intermediary mechanism transfers the weight information while isolating the weighing cell from the harsh thermal environment.
3Ease of repair
If the weighing cell is accessed by opening the housing, then maintenance is simplified, but the explosion protection is compromised and access time increases
Solution Approach 1:
The weighing cell is positioned externally to the pressure-resistant housing, allowing maintenance personnel to access and service the weighing cell without opening the housing. This maintains the explosion protection integrity while simplifying maintenance procedures.
Solution Approach 2:
The system separates the maintenance-accessible weighing cell from the sealed pressure-resistant housing. This segmentation allows independent access to the weighing cell for maintenance while the housing remains closed to maintain explosion protection.
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
Ensures the weighing cell can be accessed and maintained without opening the housing, reducing measurement errors by keeping the temperature-sensitive cell away from high temperatures and improving accuracy through pressure compensation.
Implementation Method 1
the rod system that acts on the weighing cell is passed out of the housing by way of at least one elastic bearing having a pressure-resistant seal
Data Source
AI summary
A conveyor belt scale (1) for transporting and weighing bulk material, having a rocker (6) that acts on a rod system (9), and having a weighing cell (11) connected with the rod system (9), is supposed to be configured in such a manner that the weighing cell, in particular, can also be reached from the outside.This is achieved in that the conveyor belt (2) is surrounded by a pressure-resistant, explosion-protected housing (7), whereby the rod system (9) that acts on the weighing cell (11) is passed out of the housing (7) by way of at least one elastic bearing (10) having a pressure-resistant seal, whereby the weighing cell (11) is positioned outside of the housing (7).