Rotary Scraper Plate Structure for Low-Leakage Slurry Discharge
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Solution Overview
Problem
Existing rotary scrapers fail to effectively discharge hard, high specific gravity foreign matters like gravel and small metal pieces from liquids with minimal liquid leakage and wear resistance, leading to inefficiencies and equipment damage.
Innovation Solution
A rotary scraper design with overlapping vertical openings in multiple plates, reinforced by resin films and an elastic ring, which prevents liquid leakage and manages wear by adjusting gaps, allowing controlled discharge of foreign matters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between the tank inner surface and blade tips is widened to discharge foreign matters, then the discharge capability is improved, but liquid leakage increases
Solution Approach 1:
The blade is divided into multiple segments that can be adjusted independently. This segmentation allows the gap between the blade tips and tank inner surface to be optimized for discharging foreign matters while the segmented structure prevents liquid leakage by allowing individual segment adjustment to maintain proper sealing.
Solution Approach 2:
The blade gap is made dynamically adjustable rather than fixed. The blade position can be changed to widen the gap for discharging foreign matters when needed, and then adjusted back to minimize liquid leakage during normal operation, providing dynamic adaptation to different operational requirements.
2Productivity
If the blade rotates continuously to discharge foreign matters, then the discharge efficiency is improved, but wear of the blade increases
Solution Approach 1:
The blade is constructed as multiple separable segments rather than a single continuous piece. This allows individual segments to be replaced when worn, while the remaining segments continue to function, maintaining discharge efficiency while managing blade wear through selective replacement rather than complete blade replacement.
Solution Approach 2:
Worn blade segments are discarded and replaced with new segments, while the non-worn segments are recovered and continue to be used. This extends the overall service life of the blade assembly and maintains discharge efficiency by ensuring that functional segments remain in place.
3Productivity
If a standard rotary scraper is used to discharge foreign matters, then the discharge function is provided, but it cannot handle hard foreign matters with high specific gravity effectively
Solution Approach 1:
The blade is divided into multiple hardened segments that can independently withstand impact from hard foreign matters. Each segment can be designed with specific hardness and toughness properties to resist damage from gravel, sand, and metal pieces while maintaining the overall discharge function of the rotary scraper.
Solution Approach 2:
The blade segments are made from composite materials or materials with specific properties (such as hardened steel or wear-resistant alloys) that provide both the strength to handle hard foreign matters and the durability to resist wear from high specific gravity particles, while still allowing the blade to perform its discharge function effectively.
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 design minimizes liquid leakage and extends operational uptime by effectively discharging high specific gravity foreign matters while maintaining wear resistance, suitable for gypsum slurry applications.
Implementation Method 1
the resin films are pressed by the fastener mechanism, the foreign matters are prevented from entering gaps between the plates and the films. If the foreign matters enters between the gap and damage the resin film, the elasticity of the film fills the gap.
Implementation Method 2
the difference between the foreign matters, and gypsum particles and water causes the foreign matters to settle on the bottom of a sedimentation tank
Implementation Method 3
the settled foreign matters are introduced into the opening of the upper plate and move into the opening of the intermediate plate by gravity when the two openings are overlapped. When the intermediate plate further rotates and the opening of the intermediate plate overlaps with the opening of the lower plate, the foreign matters in the opening of the intermediate plate fall through the opening of the lower plate.
Data Source
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AI summary
A rotary scraper for discharging foreign matters hard and with high specific gravity such as gravel settled in liquid is provided. The rotary scraper has reduced leakage of liquid and is easily dealt with regarding abrasion by the hard foreign matter. The rotary scraper comprises at least three plates of an upper plate; a lower plate; and an intermediate plate between the upper plate and the lower plate; the at least three plates overlapping with each other in a plan view. The at least three plates have openings passing through the plates in a vertical direction respectively, and a means for rotating the intermediate plate is provided. The openings are arranged to switch, by rotation of the intermediate plate, between a state where the opening of the upper plate and the opening of the intermediate plate are overlapped and the opening of the intermediate plate is not overlapped with the opening of the lower plate and a state where the opening of the intermediate plate and the opening of the lower plate are overlapped and the opening of the intermediate plate is not overlapped with the opening of the upper plate.