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Summary of Vacuum Pump Standards
Vacuum Pump Standards Summary
With the development of vacuum pump technology and its wide range of practical applications, standards for vacuum pumps have been established at various levels in the world. International standards, national standards and various standards of vacuum pump industry are......
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Faults and Maintenance Countermeasures of Numerical Control Equipment
Introduction To begin with, CNC means Computer Numerical Control, which is a kind of cutting-edge technology that uses computers to control the functions of a variety of machinery and equipment. It is widely used in modern industry due to its outstanding productivity and accuracy. The CNC machine c......
Faults and Countermeasures of Hot Runner of Injection Mold
Injection moulding machines are widely used in many industries in order to create a variety of different moulded products. The use of such machines requires the correct operation of a number of components and systems in order to ensure that parts are produced with the required level of accuracy an......
Ultrasonic flaw detection
Ultrasonic inspection
Introduction
Ultrasound testing is the examination method that uses the mechanical waves in the elastic state of the material to detect its internal defects.In this test, the elastic wave is transmitted through the metal material and the reflected waves are received by the ......
GB7022-86 Determination of noise sound power level of positive displacement compressors - simple method
Volume Compressor Noise Sound Power Level Measurement - Simplified Method
Introduction
Numerous machines and equipment emit noise as part of their normal operation. In many cases, the level of that noise is regulated, and the ability to accurately measure the sound power level is essential. This......
GB 13580.5-92 Determination of fluorine, chlorine, nitrite, nitrate and sulfate in atmospheric precipitation
，回答以下几个问题：
Introduction
Atmospheric precipitation is a water cycle process and usually blended with aerosol particles, dust and other substances. These substances include halogens (such as fluoride and chlorine), nitrite, nitrate, sulfate, etc. The Chinese national standard GB 13580.5-92......
GB 15384-94 Gas cylinder model nomenclature
Abstract
This paper introduces the naming method for gas cylinder models, which is based on the standard GB 15384-94 of gas cylinders. By applying the naming method along with the classification of the standard, this paper presents a set of methods that can be used to designate a particular gas c......
GB/T7445-1995 pure hydrogen, high-purity hydrogen and ultra-pure hydrogen
GB/T 7445-1995 Hydrogen, High Purity Hydrogen and Ultra-high Purity Hydrogen
1 Scope
This standard specifies the requirements, sampling and chemical and physical testing of hydrogen, high purity hydrogen, and ultra-high purity hydrogen.
2 Normative References
The following documents are essent......
Pump noise measurement and evaluation method (national standard)
Measurement and Evaluation of Noise from Pumps
Introduction
The measurement and evaluation of noise from pumps is a critical element of controlling noise pollution in a variety of industrial and commercial environments. While most standards for the measurement and evaluation of noise from pumps ......
Deviation and Correction Method of Shaving-tooth Contact Area in Gear Machining
Meshing Deviation and Correction methodology of Spur Gear in Gear Machining
Introduction
In gear machining, the meshing of toothed gear refers to the state of contact between the tooth surfaces of two gears, which is of great significance to the smooth transmission of power. Meshing deviation is......
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