Small knowledge of sight glass
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-Time:2022-02-16 14:41
Small knowledge of sight glass
1. Introduction
Glass sight glass is a special equipment used to investigate the activity of liquid, gas, steam and other media. It has the characteristics of high transparency, high mechanical strength and good chemical stability. Usually high-quality heat-resistant glass is used as the raw material, and it is processed by special technology. made.
2. Technical indicators
1. Light transmittance. Transmittance refers to the percentage of the luminous flux after the light passes through the glass to the luminous flux before it passes through. The primary factors affecting the transmittance of the mirror glass are the material composition and production technology.
2. Thermal properties. It mainly includes thermal expansion, thermal conductivity, temperature resistance, cold and hot temperature difference resistance, softening function, etc.
3. Mechanical properties. It mainly includes hardness, compressive strength, flexural strength and elastic modulus, in addition to tensile strength, impact strength, cracking properties, etc.
Three, edging technology attention to questions
1. The polished edges of both ends of the mirror glass are unqualified, and the angle and pressure of the polishing wheel need to be adjusted.
2. There is an abrasive belt regrinding scene at both ends of the polished edge, and the edge should be poured first and then polished.
3. Cracks appear on the chamfered edge of the polished edge. Due to the large amount of grinding of the chamfered edge, the supply of cooling water is lacking.
Fourth, polishing
The polishing treatment of glass sight glass mainly includes physical and chemical methods. After polishing, unevenness, scratches and other defects on the surface of the mirror glass will be removed.
When polishing, to choose an accurate polishing tool, the following elements should be considered:
1. Types of edging machines.
2. The condition of the diamond grinding wheel used for rough grinding and fine grinding on the edge of the sight glass.
3. Request for the brightness of the glass edge.
4. Grinding and polishing standards, etc.
5. Classification
1. Boiler sight glass, pressure vessel glass sight glass: The standard is relatively small, the shape is usually round or square, and the thickness is 2-50mm. It is used in various chemicals, pressure vessels, electric power, medicine, boilers, etc. as investigation windows. , Peep hole.
2. Glass sight glasses for petroleum and chemical pipelines are mainly used for high acid-base concentration and large temperature changes. The glass is required to have excellent compressive resistance and thermal shock resistance. It is usually used in high-pressure containers, petroleum, chemical industry, nuclear power plants, etc. higher places.
3. Sight tube glass sight glass: high temperature glass tube is widely used in medical equipment, water treatment, food hygiene, chemical pipeline, lighting production, etc. Because of this series of products, it has strong pressure resistance, good thermal stability, corrosion resistance and high light transmission. , Conventional thickness: 1-10mm, Conventional exception diameter: 15-200mm, temperature resistance: 500 ° C, 1500 ° C, the length can be cut according to customer requirements.
6. Aging scene
All substances have a certain service life, and mirror glass is no exception, which touches on the question of aging, and timely understanding and discovery of aging mirror glass plays an important role in production.
The aging of glass sight glass is mainly reflected in:
①, the transparency decreased. ②, showing cracks
When aging occurs, new glass sheets must be replaced in time to avoid production accidents.
7. Use
It is mainly used to investigate and monitor the production status, and is an indispensable component in chemical, metallurgy, steel mills, pipelines, etc.
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