Molding Sand Reclamation Roller Pressure Feedback Control
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Solution Overview
Problem
Conventional molding sand reclamation apparatuses face challenges in maintaining consistent sand quality due to variable pressure control and inability to measure sand flow changes in real-time, leading to inconsistent reclaimed sand properties.
Innovation Solution
The apparatus includes a flow detector, current detector, and pressure controller to adjust the roller's pressure based on sand flow, ensuring the motor current matches the desired current for optimal sand polishing, thereby enhancing sand quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the roller pressure is not controlled, then the apparatus structure is simple, but the sand quality varies widely and cannot be maintained consistently
Solution Approach 1:
The patent implements a feedback control system where a flow detector measures sand flow rate, a current detector monitors motor current, and a pressure controller adjusts roller pressure based on the relationship between flow and current. This closed-loop feedback mechanism maintains consistent sand quality by dynamically adjusting pressure to match actual sand flow conditions, resolving the contradiction between quality consistency and system complexity.
Solution Approach 2:
The patent changes the operational parameters of the roller pressure system from fixed to variable. By using the flow-detector and current-detector to monitor sand flow rate and motor current, the system dynamically adjusts roller pressure parameters to match actual operating conditions, thereby maintaining consistent sand quality across varying production rates without requiring an overly complex control system.
2Manufacturing precision
If the motor driving force does not match the sand flow, then the apparatus can operate with simple control, but the reclaimed sand quality cannot be maintained
Solution Approach 1:
The patent employs feedback control by monitoring motor current with a current detector and comparing it to the sand flow rate measured by the flow detector. The pressure controller uses this feedback information to adjust roller pressure, which in turn optimizes motor driving force to match sand flow conditions, maintaining high reclaimed sand quality while implementing appropriate levels of automation.
Solution Approach 2:
The system achieves a form of self-service control where the flow detector and current detector automatically monitor their respective parameters, and the pressure controller automatically adjusts roller pressure based on the detected conditions. This semi-automated system maintains sand quality without requiring constant manual intervention, balancing automation extent with operational simplicity.
3Adaptability or versatility
If real-time sand flow measurement is not implemented, then the measurement system is simpler, but the operational control cannot respond to flow changes
Solution Approach 1:
The patent implements real-time feedback control by installing a flow detector that continuously measures sand flow rate and feeds this information to the pressure controller. This enables the system to respond dynamically to flow changes and adjust roller pressure accordingly, enhancing adaptability while keeping the measurement system relatively simple through the use of standard flow detection technology.
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 allows for real-time adjustment of roller pressure to match sand flow changes, improving the quality of reclaimed molding sand by maintaining optimal operational conditions.
Implementation Method 1
The sand is continuously fed into the rotary drum and is piled on the inner surface of the inclined circumferential wall of the drum by centrifugal force.
Implementation Method 2
The roller presses the piled sand to remove its deposit.
Implementation Method 3
a method of removing deposit from the surfaces of sand by pressing the sand by the roller
Data Source
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AI summary
The object of the invention is to provide an apparatus for reclamation of molding sand by which the quality of the reclaimed molding sand is enhanced. The apparatus for reclamation of molding sand comprises a part for feeding the molding sand 11, which part has a sand falling port at its bottom, a rotary drum 2 disposed below the part for feeding the molding sand 11 and being rotatable horizontally, a motor driving means 4 for rotating the rotary drum 2 by an electric motor 3, a roller 5 disposed in the rotary drum 2 and spaced apart therefrom, and a cylinder 6 connected to the roller 5 that presses the roller 5 toward the rotary drum 2. It further comprises a flow detector for the sand A disposed at the sand falling port of the part for feeding the molding sand and for detecting the flow of the sand fed into the rotary drum; a current detector B for detecting the current of the motor driving means; a pressure controller C for controlling the pressure of the cylinder; and a controller D for controlling the force of the cylinder 6 that is pressing the roller 5 based on the flow of the sand detected by the flow detector for the sand A.