Extruder Filling Control for Elastomeric Compound Mixing
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Solution Overview
Problem
The existing methods for producing elastomeric compounds for tires face challenges in maintaining optimal productivity and quality, particularly due to issues with filling degree control and temperature management in continuous extruders, which can lead to scorching and contamination from anti-stick agents.
Innovation Solution
Implementing a feedback control system that adjusts the production speed of small elastomeric pieces based on real-time measurements of torque and hopper filling levels to maintain the extruder's filling degree within a predetermined range, thereby optimizing productivity and quality, and eliminating the need for anti-stick agents by controlling piece sizes and using a lubricating liquid for improved flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of extrusion screws is increased to improve productivity, then the output increases, but the compound temperature rises too much causing scorching
Solution Approach 1:
A feedback control system is implemented that continuously monitors the filling degree of the extruder and automatically adjusts the feed rate of elastomeric compound to maintain optimal operating conditions. This prevents temperature rise and scorching while allowing higher screw rotation speeds for improved productivity.
Solution Approach 2:
The invention changes the control parameter from fixed feed rate to dynamic feed rate adjustment based on real-time filling degree measurement. By adjusting the feed rate parameter in response to filling degree variations, the system maintains optimal temperature and mixing conditions while maximizing productivity.
2Manufacturing precision
If the flow rate of compound is controlled to maintain filling degree, then mixing quality improves, but productivity may be limited
Solution Approach 1:
The system transitions from static flow rate control to dynamic control where the feed rate continuously adapts to maintain optimal filling degree. This dynamic adjustment allows the system to operate at maximum productivity while preserving mixing quality through real-time optimization of flow conditions.
Solution Approach 2:
The feedback control system monitors filling degree and adjusts feed rate accordingly, enabling the system to maintain optimal mixing conditions dynamically. This allows productivity to be maximized at each moment while preserving mixing quality through continuous optimization rather than being constrained by fixed flow rate limits.
3Manufacturing precision
If small pieces of elastomeric compound are fed to the extruder, then mixing efficiency improves, but pieces may pack in the hopper causing flow issues
Solution Approach 1:
Vibration is applied to the hopper to prevent packing of small elastomeric pieces and ensure continuous flow to the extruder. This mechanical vibration disrupts particle interlocking and maintains flow continuity while allowing small piece sizes for improved mixing efficiency.
Solution Approach 2:
The system changes the state of the hopper from static to vibrating, altering the flow characteristics of the small elastomeric pieces. This parameter change prevents packing while maintaining the benefits of small piece feeding for improved mixing efficiency.
4Ease of operation
If anti-stick agents are used to prevent packing, then flow improves, but compound contamination occurs
Solution Approach 1:
The invention converts the potentially harmful effect of packing into a beneficial controlled flow condition through vibration. By using mechanical vibration instead of chemical anti-stick agents, the system improves flow while avoiding compound contamination, maintaining both ease of operation and compound purity.
Solution Approach 2:
Vibration acts as an intermediary mechanism to prevent packing and improve flow without requiring chemical anti-stick agents. This physical intermediary achieves the flow improvement goal while avoiding the harmful contamination effect of chemical agents.
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 approach enhances the quality and productivity of the elastomeric compounds by maintaining steady operating conditions, preventing scorching, and reducing contamination, while allowing for precise control of the mixing process without the use of powdery anti-stick agents.
Implementation Method 1
real-time measurements of torque and hopper filling levels
Implementation Method 2
using a lubricating liquid for improved flow
Data Source
Figure 1~1c
Figure 2a~3a
Figure 3b~4b
AI summary
An apparatus for producing elastomeric compounds comprises: a device for reducing an elastomeric compound (4) into small pieces (3) of controlled sizes; a device (5) for continuously feeding the elastomeric compound (4) to an inlet (8) of the device (2) for reducing into small pieces (3); a mixing extruder (6) having an inlet opening (18a) operatively connected with an outlet (16) of the device (2) for reducing into small pieces (3); a device for detecting at least one magnitude value (L, C) indicative of the filling degree of the mixing extruder (6). A control unit (26) operatively connected to the device (2) for reducing into small pieces (3) and the detecting device (25), adjusts the operating speed of the device (2) for reducing into small pieces (3) in such a manner as to maintain said indicative magnitude in the neighbourhood of a predetermined value.