Continuous Horizontal Mixer for Fiber-Reinforced Concrete Panels
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Solution Overview
Problem
Current batch mixers for producing fiber-reinforced cementitious slurry are inefficient due to non-continuous operation, long mixing times, fiber lumping, damage to reinforcing fibers, and incompatibility with rapid setting materials, making them unsuitable for continuous panel production lines.
Innovation Solution
A continuous method using a horizontal single-pass mixer with a rotating shaft and mixing elements like augers and paddles to mix cementitious slurry and fibers in a single layer, ensuring uniform distribution and preventing fiber damage, allowing for rapid production of fiber-reinforced cementitious panels with desired rheological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch mixers are used to mix cementitous slurry and fibers, then mixing can be performed, but the operation is non-continuous, resulting in long mixing times and reduced productivity
Solution Approach 1:
The patent employs a continuous mixer that operates without interruption, allowing cementitous slurry and fibers to be mixed continuously as they flow through the mixing chamber. This eliminates the start-stop nature of batch mixing, reducing total mixing time and increasing production speed while maintaining consistent fiber distribution throughout the slurry.
2Manufacturing precision
If conventional batch mixers are used, then mixing can be performed, but fiber lumping occurs and fibers are damaged, reducing manufacturing precision
Solution Approach 1:
The continuous mixer employs dynamically adjusting mixing elements that adapt to the flow characteristics of the slurry-fiber mixture. The mixing intensity and duration are automatically optimized as materials pass through different zones of the mixing chamber, ensuring uniform fiber distribution without excessive mechanical stress that would cause fiber damage or lumping.
Solution Approach 2:
The mixer design pre-condition the slurry and fiber streams before they enter the main mixing zone, ensuring optimal mixing conditions from the start. This preliminary preparation prevents fiber lumping by ensuring proper dispersion before the fibers are fully incorporated into the cementitous matrix.
3Adaptability or versatility
If batch mixing is used, then mixing can be performed, but it is incompatible with rapid setting materials, reducing adaptability
Solution Approach 1:
The continuous mixing process eliminates idle time between mixing cycles, maintaining constant motion and mixing action. This is critical for rapid setting materials that require immediate and continuous mixing to achieve proper homogeneity before setting begins, thereby expanding the system's adaptability to work with fast-setting cementitous compositions.
4Productivity
If continuous mixing is implemented, then productivity increases, but device complexity increases
Solution Approach 1:
The continuous mixer is designed as a multi-functional unit that combines mixing, conveying, and material flow control in a single integrated system. This universal design achieves continuous operation and high productivity without requiring multiple separate components, thereby limiting the increase in device complexity while maintaining enhanced production efficiency.
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 method enables the production of fiber-reinforced cementitious panels with uniform fiber distribution and desirable rheological properties, facilitating continuous production, reducing mixing time, and preventing fiber damage, thus improving efficiency and cost-effectiveness.
Implementation Method 1
A continuous method using a horizontal single-pass mixer with a rotating shaft and mixing elements like augers and paddles to mix cementitious slurry and fibers
Data Source
AI summary
Continuous method including mixing water and cementitous powder to form slurry; mixing the slurry and reinforcement fibers in a single pass horizontal continuous mixer to form fiber-slurry mixture, the mixer including an elongated mixing chamber having a reinforcement fiber inlet port, and upstream of the fiber inlet port is an inlet port to introduce water and cementitous powder together as one stream or at least two inlet ports to introduce water and dry cementitous powder separately as separate streams into the chamber, a rotating horizontal shaft/s within the chamber, part of the chamber for mixing the fibers and slurry and moving the fiber-slurry mixture to a mixture outlet; discharging the fiber-slurry mixture from the mixer outlet; forming and setting the fiber-slurry mixture on a moving surface; cutting the set mixture into fiber reinforced concrete panels and removing the panels from the moving surface.