Rotary Compression Molding Controller for Material Level Stability
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Solution Overview
Problem
Rotary compression molding machines face challenges in maintaining a balanced supply of powdery material, leading to production interruptions due to material shortages or overflows, resulting in defective products and increased labor and time for inspection and cleaning.
Innovation Solution
A controller adjusts the rotational speed of the turret and punches to maintain a constant level of powdery material in the feed pipe, increasing speed when the material level is low and decreasing it when the level is high, preventing production stops and ensuring continuous production of desired molded products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of powdery material fed from the powdery material feeding device and the amount of powdery material used by the rotary compression molding machine are unbalanced, then material shortage or overflow occurs leading to production interruption, but stopping and restarting the machine requires extra labor and time
Solution Approach 1:
The controller receives detection signals from level detection means (such as capacitive sensors or photoelectric sensors) that monitor the level of powdery material in the feeder, and based on this feedback information, the controller adjusts the rotational speed of the turret to maintain material level within a predetermined range, preventing both shortage and overflow conditions
Solution Approach 2:
The rotational speed of the turret is dynamically adjusted based on the detected material level in the feeder. When material level is low, the rotational speed is increased to consume material faster; when material level is high, the rotational speed is decreased to allow material accumulation, creating a dynamic balance that prevents production interruptions
2Force
If the turret stops rotating and then restarts, then compression pressure must be temporarily reduced to decrease resistance against re-acceleration, but defective molded products are produced until parameters stabilize
Solution Approach 1:
The level detection means detects the material level in advance before shortage or overflow occurs, and the controller adjusts the rotational speed proactively to maintain material level within the predetermined range, preventing the need for turret stoppage and the subsequent production of defective products
Solution Approach 2:
By continuously monitoring the material level and continuously adjusting the rotational speed, the system maintains uninterrupted operation of the turret, ensuring continuous production of quality molded products without the need to stop and restart the machine
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 continuous production of desired molded products by maintaining a balanced supply of powdery material, reducing waste and labor costs associated with stopping and restarting the machine.
Implementation Method 1
These feeders are similarly configured to drop the powdery material into the die bore by means of gravity force
Data Source
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AI summary
A controller (C) of a rotary compression molding machine configured to rotate a turret (3) including a table (31) having a die bore (4), and punch retaining portions (32, 33) vertically slidably retaining punches (5, 6) disposed above and below the die bore (4) along with the punches (5, 6), and fill the die bore (4) with a powdery material from a filling device (X) disposed just above the table (31), to compress the powdery material filled in the die bore (4) with the punches (5, 6) and obtain a molded product, the controller (C) being configured to adjust rotational speed of the turret (3) and the punches (5, 6) to allow the powdery material in a feed pipe (191) directly connected with the filling device (X) and configured to feed the filling device (X) with the powdery material to have a level of an upper surface (L) kept within a constant target range.