Cleanroom Actuator with Segmented Airtight Enclosure
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Solution Overview
Problem
Conventional actuators fail to maintain high cleanliness in clean environments due to design flaws that allow debris and dust to escape or enter, and they become bulky when trying to achieve high-speed operation and acceleration, making them unsuitable for modern machinery requiring high cleanliness class.
Innovation Solution
An actuator with an elongated U-shaped bed enclosed in an airtight enclosure, featuring a slider with rolling elements, a compact design, and strategically placed suction ports to minimize air volume and prevent contamination, along with T-slot packings and sensors outside the enclosure to enhance airtightness and reduce air suction requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the actuator is enclosed in an airtight enclosure to prevent contamination, then cleanliness class is improved, but the volume of air to be suctioned increases making the system bulkier
Solution Approach 1:
The airtight enclosure is divided into multiple sealed compartments (first compartment containing the bed, second compartment containing the slider). This segmentation allows independent sealing of each compartment, reducing the total air volume that needs to be suctioned while maintaining overall cleanliness class.
Solution Approach 2:
The patent transitions from a single large enclosed space to multiple smaller compartmentalized spaces arranged in a specific spatial configuration. This dimensional reorganization reduces the total air volume requiring suction while preserving the airtight seal necessary for high cleanliness class operation.
2Productivity
If the actuator components are made compact to reduce size, then productivity is improved, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent applies different quality requirements to different components: the bed and enclosure are made with high manufacturing precision to ensure airtight sealing and positional accuracy, while the slider and rolling elements are designed with specific local properties (hardness, surface finish) to maintain precision under high-speed operation. This localized quality approach allows compact design without sacrificing overall precision.
Solution Approach 2:
The patent optimizes material parameters and geometric parameters of key components to achieve both compactness and precision. By carefully selecting and adjusting parameters such as material hardness, surface roughness, and dimensional tolerances, the actuator achieves high-speed capability while maintaining manufacturing precision for accurate position control.
3Weight of moving object
If the bed and slider are made of light alloy to reduce weight, then 1st parameter is improved, but structural strength decreases requiring larger dimensions
Solution Approach 1:
The patent employs composite construction by combining light alloy materials (such as aluminum alloys) with strategic use of other materials or structural reinforcements. The bed and enclosure are made from light alloy to reduce weight, while specific high-strength components or localized reinforcement elements are integrated to maintain necessary structural strength without increasing overall dimensions.
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 actuator achieves high mechanical strength, accuracy, and reduced weight, enabling high-speed operation and high acceleration/deceleration while maintaining a high cleanliness class with lower air suction needs, ensuring effective contamination control in clean environments.
Implementation Method 1
a slider movable lengthwise between the side walls of the bed through rolling elements
Implementation Method 2
an airtight enclosure shrouding lengthwise opposite ends, lengthwise side surfaces and tops of the bed
Implementation Method 3
strategically placed suction ports to minimize air volume and prevent contamination
Data Source
AI summary
A clean environmental actuator is less in weight, height in transverse section and compact in construction, even with ensuring accurate position control and conformable to high speed operation and high acceleration/deceleration. Both a bed and a slider are stowed in an enclosure and packings are in T-slots in side walls of the bed to seal clearances between the bed and the enclosure. The enclosure is composed of an end bracket to cover one end of the bed, a motor bracket to cover another end of the bed, a pair of side coverings to enclose the side surfaces and tops of the side walls of the bed, a sealing panel to cover an upward opening between the side coverings, and a table covering to overlay an area of the sealing panel lying on the slider and side areas of the table bulging out from side edges of the sealing panel.