Metal hinge of corrosion-resistant fume hood: material, design and application
Fume hood is an indispensable facility in laboratory equipment. It can effectively eliminate harmful gases and particles produced in the experiment process, and ensure the health of operators and the safety of laboratory environment. In the design and manufacturing process of fume hood, metal hinge, as one of the important parts, needs to have good corrosion resistance while ensuring the normal opening and closing of fume hood. This paper will discuss the metal hinge of anti-corrosion fume hood.
First, the importance of metal hinges
Metal hinge is the key component connecting the door panel and frame of fume hood, and its quality is directly related to the overall stability and service life of fume hood. Especially for fume hoods used in special environments such as chemical laboratories, due to frequent contact with corrosive substances such as various acid-base solutions and organic solvents, hinges are required to be not only durable, but also have excellent corrosion resistance.
Second, the commonly used materials and their characteristics
1. Stainless steel: one of the most commonly used materials at present, which is widely used because of its excellent mechanical properties and good corrosion resistance. Among them, 304 stainless steel is suitable for general corrosive environment; For strong acid and alkali or salt spray corrosive environment, 316L stainless steel is recommended.
2. Aluminum alloy: light and high strength, and its corrosion resistance can be improved by surface treatment. Suitable for light weight door panels.
3. Coating materials: for example, galvanized steel plate, nickel alloy, etc., the protective layer on the metal surface is added by electroplating to improve the corrosion resistance. The cost of this method is lower, but the long-term stability is slightly worse.
Third, structural design considerations
Bearing capacity: select products with appropriate size and wall thickness according to the weight of the door leaf to ensure sufficient bearing capacity;
Opening and closing angle: usually it needs to reach more than 90 degrees in order to fully open and fix the state for the operator to enter and exit;
Sealing: In some cases, it may be necessary to consider whether the hinge is easy to leak air or liquid. At this time, special attention should be paid to the machining accuracy and tolerance control of the joint.
Aesthetics and easy maintenance: the demand for aesthetic appearance should not be ignored when designing, and the complexity of daily cleaning and maintenance should be reduced as much as possible.
Fourth, the application scenario analysis
1. Chemical laboratory: The places that need frequent contact with all kinds of chemicals are the most common. In this environment, 316L stainless steel hinges are preferred to obtain the best protection effect;
2. Hospital Laboratory: It is recommended to use a surface treatment type (such as mirror polishing) that is easy to disinfect and clean for areas that may be at risk of biological pollution;
3. Clean workshop of electronic factory: The cleanroom here is often required to have a high grade and no particles falling off. Therefore, it is recommended to choose PTFE-coated hinges or all-plastic parts with low friction coefficient to avoid the product line being polluted by debris generated by metal wear.
To sum up, the metal hinge of anti-corrosion fume hood not only involves material science knowledge, but also includes engineering design principles and other aspects. Reasonable selection and careful construction can truly achieve the expected goal-that is, to provide a safe and efficient workspace!
Rec. Prods.
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