I. Overview Generalization

Gassing refers to the type of “core” sand specimen is heated, in the specified time the number of milliliters of gas occurred, called the amount of gas, can be used per gram of the specimen gas milliliters to indicate. Another meaning of gas generation is the speed of gas generation, with the specimen of gas generation and time to express the relationship between the curve. Type [core] sand gassing and casting quality has a close relationship. Molding materials and type (core) sand gas will affect the casting to produce porosity or formation of sand traps, so casting should pay attention to the molding material gas control. In recent years, with the chemical binder in the foundry industry is widely used, hope in specific temperature conditions, measured gas volume and gas velocity is more important. When the liquid metal is poured into the sand mold, the sand mold and the sand core are subjected to the thermal action of the high-temperature metal, so that a large amount of gas is generated from the water and various additives (such as resin binder, coal dust and other substances) in the sand mold. For example: automobile, tractor and other engine cylinder block, cylinder head and other castings, due to the complexity of the shape, need to use a lot of resin sand core, the amount of gas is very high. Often check the gas generation of the type [core] sand, you can avoid the casting of defects such as porosity, reduce scrap, improve yield.

When modeling with damp mold sand, the main materials are clay, coal dust and sand. By detecting the gassing property of the molding sand (old sand), the content of coal powder in the molding sand (old sand) can be calculated. Reasonable control of the amount of coal dust and old sand, saving material costs. It can also improve the surface quality of castings and reduce the scrap rate.

In the use of resin sand, through the detection of gas emission of recycled sand, you can judge the residual amount of resin, reasonable reuse of a large number of recycled sand.

In a word, the determination of gassing has a wide range of uses, and is of great significance in improving the quality of castings, reducing the rate of scrap, and improving the economic and social benefits.

FQX-2000A Intelligent Computerized Gassing Tester is a highly intelligent analytical instrument controlled by computer in the latest era. It applies advanced electronic technology, computer technology and sensing technology to the detection of gas emission of modeling materials. Using the principle of gas pressure measurement, it realizes the automatic measurement of each technical index of the gasiness, the computer displays the whole process of gasiness at the right time, and draws and prints the analysis result and report. This instrument is very simple and convenient to operate, and is the most ideal analyzing and testing instrument for the laboratory of modern foundry enterprises.

II. Instrument features and technical performance

2.1 Main features of the instrument.

1. the detection and circuit processing system is reasonably designed, strong anti-interference ability, stable display data, accurate and reliable analysis results. 2.

2. WINDOWS7 platform color Chinese operating system, screen display and printing are using Chinese characters, keyboard and mouse and color screen, clear interface, clear tips, simple and convenient operation.

3. The analyzing process dynamically displays the real-time data, gas generation curve and release curve. Designed with curve storage, reproduction, comparison, printing and other functions, convenient for scientific research. 4.

4. It can be connected with electronic balance to realize indefinite weighing of samples in order to improve the measuring accuracy and analyzing speed, and the automatic acquisition of digital saws and manual input can be chosen arbitrarily.

5. This gas tester can automatically measure and display the ambient temperature, furnace temperature and pressure measurement end temperature, and utilize computer technology and automatic temperature compensation technology to automatically control the high temperature decomposition furnace and pressure measurement system respectively. Make the analysis results stable and reliable.

6. the use of the United States imported pressure sensors can be at room temperature and high temperature of the gas volume of the digital collection and processing, data stability and reliability.

7. The temperature of the measuring system is controlled by constant temperature, which can be stably controlled at 105℃. Eliminate moisture condensation and other factors on the impact of gas generation, measurement results are more accurate and more realistic. 8.

8. All the data collected by this tester can still be kept in the database of the computer system completely and without limitation, so that it can be queried and displayed and printed out.

9. Strong system functions, low failure rate, wide range of applications. The computer can be used offline.

2.2 Main technical indicators

1. Measuring range 0-300ml/g, the measuring range can be set arbitrarily. 2;

2. Measurement accuracy less than ±1% of the full range;

3. Decomposition furnace temperature 600--1350 ℃, precision 1 level. 4;

4. system gas chamber temperature room temperature - 120 ℃, precision level 1. 5;

5. Timing range 0-150min; it can be set arbitrarily according to the high and low gas generation;

6. working environment temperature -5-45℃; humidity 85%; the surrounding environment should be relatively stable.

7. Rated power not more than 4kW. 8;

8. power supply voltage AC220V±10%, 50HZ;