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, which mixes with lubricating oil and contaminates the molded products or the machine's interior, especially at higher operational speeds.
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 allows for air circulation and prevents dust from entering the internal space of the dust cover, and can be easily cleaned and maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a communicating groove or intake/exhaust port is formed to allow air circulation in the dust cover, then air can flow to enable the dust cover to expand and contract, but dust on the table surface is sucked into the dust cover internal space through these openings
Solution Approach 1:
The invention transitions from a two-dimensional surface opening (communicating groove or port on the dust cover surface) to a three-dimensional subsurface approach by forming air passages within the upper punch retaining portion. The air intake openings are positioned at the bottom surface of the retaining portion, directing air flow from below the table surface level, thereby separating the air intake path from the dust-containing surface environment.
Solution Approach 2:
The invention creates alternative air intake pathways by forming multiple air passages within the upper punch retaining portion structure itself, providing redundant air circulation routes that bypass the contaminated surface environment where conventional openings would be located.
2Productivity
If the molding machine operates at higher rotational speed to improve productivity, then the number of produced molded products per unit time increases, but the upper punch moves faster causing more dust to be sucked into the dust cover
Solution Approach 1:
The invention positions air intake openings at the bottom surface of the upper punch retaining portion, utilizing the vertical dimension to intake air from below the table surface. This spatial repositioning ensures that even at high rotational speeds, the air intake path remains separated from the dust-laden surface environment, preventing speed-related dust suction problems.
3Stability of the object's composition
If a breathing bore is drilled in the upper punch retaining portion or upper punch to allow air circulation, then air can flow to the dust cover internal space, but drilling an elongated breathing bore is costly and difficult to clean and maintain
Solution Approach 1:
The invention divides the air circulation function into multiple separate air passages formed within the upper punch retaining portion, rather than using a single elongated breathing bore. This segmentation allows each passage to be shorter and more accessible, facilitating easier manufacturing and cleaning maintenance while collectively providing adequate air circulation to the dust cover internal space.
Solution Approach 2:
The invention uses the bottom surface of the upper punch retaining portion as an intermediary structure to introduce air into the system. By positioning air intake openings at this intermediate location and forming passages through the retaining portion material, the design avoids the need for difficult-to-clean elongated bores while still achieving the required air circulation function.
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
Effectively inhibits dust from entering the dust cover, reducing contamination of molded products and the machine's interior, while being a cost-effective and simpler solution compared to drilling breathing bores in the upper punch retaining portion.
Implementation Method 1
The dust cover is elastically deformed to expand and contract in accordance with vertical motion of the upper punch
Data Source
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AI summary
A rotary compression molding machine (1) comprising an upper punch retaining portion (32) disposed above a table (31) including die bores (4) and retaining an upper punch (5), a dust-proofing device (7) comprising a sealing case (71) including a bottom wall (711) that has an insertion bore (712) penetrated by the upper punch (5) and faces a downward surface of the upper punch retaining portion (32), and an outer wall (716) facing an outer surface of the upper punch retaining portion (32), and supported by the upper punch retaining portion (32), and an expandable dust cover (73) attached to be in contact with a downward surface of the bottom wall (711) of the sealing case (71) and covering a circumferential edge of the insertion bore (712) and an outer circumference of the upper punch (5), and air passages (714, 715, 717) disposed between the outer wall (716) of the sealing case (71) and the outer surface of the upper punch retaining portion (32) as well as between the bottom wall (711) of the sealing case (71) and the downward surface of the upper punch retaining portion (32) and communicating with an internal space of the dust cover (73).