Rotary Compression Molding Dust Cover Venting Against Contamination
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Solution Overview
Problem
Rotary compression-molding machines face issues with dust scattering and contamination due to the suction of dust into the dust cover, especially at higher operational speeds, leading to foreign matter being mixed with lubricating oil and contaminating molded products or the machine's interior.
Innovation Solution
A dust-proofing device with a sealing case and expandable dust cover, featuring air passages between the sealing case and the upper punch-retaining portion, which are designed to open away from the table with dust, preventing dust from entering the internal space of the dust cover and allowing easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dust cover is designed with breathing ports or communicating bores to allow air flow, then the dust cover can expand and contract properly, but dust is sucked into the internal space of the dust cover through these ports during high-speed operation
Solution Approach 1:
The patent applies local quality by creating a pressure differential in different regions of the dust cover. The downward surface of the sealing case is designed to be depressurized specifically, while other regions maintain normal pressure. This localized pressure change allows the dust cover to breathe without creating suction that would draw dust in through breathing ports.
Solution Approach 2:
The patent applies preliminary anti-action by preemptively counteracting the harmful effect of dust suction. The depressurization of the downward surface of the sealing case creates an upward airflow that prevents dust from being drawn into the dust cover through breathing ports, thus preventing the problem before it occurs.
2Productivity
If the rotational speed of the molding machine is increased to improve productivity, then more molded products are produced per unit time, but dust is sucked into the dust cover faster and more extensively
Solution Approach 1:
The patent applies parameter changes by modifying the pressure parameter in the dust cover environment. By depressurizing the downward surface of the sealing case, the patent changes the pressure differential that drives air flow, thereby controlling dust intake regardless of the machine's rotational speed.
3Use of energy by moving object
If breathing ports or communicating bores are provided in the dust cover, then air can flow in and out, but these ports become pathways for dust and foreign matter to enter the internal space
Solution Approach 1:
The patent applies local quality by creating a distinct pressure zone on the downward surface of the sealing case. This localized depressurization creates a controlled airflow pattern that allows breathing functionality while preventing dust from entering through breathing ports.
Solution Approach 2:
The patent applies preliminary anti-action by preemptively counteracting the harmful effect of dust suction. The depressurization of the downward surface of the sealing case creates an upward airflow that prevents dust from being drawn into the dust cover through breathing ports, thus preventing the problem before it occurs.
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 configuration effectively inhibits dust from entering the dust cover, reducing contamination of molded products and the machine's interior, while being simpler and less costly to implement than drilling elongated breathing bores, and easier to maintain than conventional dust cover designs.
Implementation Method 1
The dust cover is elastically deformed to expand and contract in accordance with a vertical motion of the upper punch
Implementation Method 2
a depressurized downward surface of a sealing case...effectively inhibiting dust from being sucked into an internal space of a dust cover
Data Source
AI summary
A rotary compression-molding machine includes an upper punch-retaining portion disposed above a table including die bores and retaining an upper punch, a dust-proofing device including a sealing case including a bottom wall that includes an insertion bore penetrated by the upper punch and faces a downward surface of the upper punch-retaining portion, and an outer wall facing an outer surface of the upper punch-retaining portion, and supported by the upper punch-retaining portion, and an expandable dust cover attached to be in contact with a downward surface of the bottom wall of the sealing case and covering a circumferential edge of the insertion bore and an outer circumference of the upper punch, and air passages disposed between the outer wall of the sealing case and the outer surface of the upper punch-retaining portion.