Immersion Grinding Apparatus Temperature Control
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Solution Overview
Problem
Existing immersion grinding apparatuses face challenges in maintaining product temperature within safe limits during the grinding process, leading to potential overheating and degradation of materials, requiring frequent interruptions and extended processing times.
Innovation Solution
The grinding apparatus allows for adjustable rotational speeds of the basket mill rotor and stirrer, reducing energy input when temperature thresholds are exceeded, stabilizing product temperature at lower equilibrium points to prevent overheating and improve grinding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the basket mill and stirrer operate at nominal speed to maintain productivity, then the grinding efficiency is improved, but the product temperature exceeds the maximum process temperature causing material degradation
Solution Approach 1:
The patent applies dynamics by making the rotational speeds of the basket mill and stirrer adjustable rather than fixed at nominal values. The control system dynamically modifies the speeds based on real-time temperature feedback from the temperature sensor, allowing the system to adapt between high-speed operation for productivity and low-speed operation for temperature control.
Solution Approach 2:
The patent implements feedback control by using a temperature sensor to continuously monitor the product temperature and automatically adjusting the rotational speeds of the basket mill and stirrer based on the detected temperature. This closed-loop feedback system prevents overheating while maintaining optimal grinding efficiency.
2Loss of time
If the apparatus operates continuously at nominal speed, then the processing time is reduced, but the product temperature exceeds safe limits requiring process interruption
Solution Approach 1:
The feedback control system continuously monitors temperature and adjusts speeds to prevent overheating, allowing continuous operation without interruptions while maintaining reliable temperature control throughout the grinding process.
Solution Approach 2:
The dynamic speed adjustment capability allows the system to operate continuously at optimized speeds that prevent temperature excursions, eliminating the need for stop-start operation and reducing total processing time while maintaining reliability.
3Stability of the object's composition
If the rotational speed is reduced to control temperature, then the temperature stability is improved, but the grinding efficiency decreases
Solution Approach 1:
The system dynamically adjusts rotational speeds based on real-time temperature conditions rather than operating at a fixed low speed. This allows the system to maintain high speeds when temperature is stable and reduce speeds only when necessary, optimizing both temperature stability and grinding efficiency.
Solution Approach 2:
The feedback control system maintains high grinding efficiency by operating at nominal speeds when temperature is within acceptable ranges and only reduces speeds when temperature approaches critical thresholds, thus maintaining temperature stability without unnecessarily sacrificing productivity.
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
This solution reduces the need for process interruptions, shortens processing times, and enhances product quality by maintaining optimal granulometry through controlled temperature management.
Implementation Method 1
A cooling liquid (usually water) is circulated in the cooling chambers, in order to remove the heat produced by the grinding assembly
Implementation Method 2
A cooling liquid (usually water) is circulated in the cooling chambers
Data Source
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AI summary
An immersion grinding apparatus, comprising: - a basket mill (22) comprising a rotor (44) located inside the basket (36) - at least one rotating stirrer (50) located outside the basket (36), and - a control unit (60) adapted to set the rotational speeds of the rotor (44) and of said at least one stirrer (50) to different values (nR′, nA′, nRʺ, nAʺ, nR‴, nA‴) lower than nominal speed values (nR, nA) when the temperatures detected by a temperature sensor (56) exceed different temperature thresholds (Tc', Ts, Tc") lower than a maximum process temperature (Tmax).