From time to time, some users have come to ask us about the specific purpose and usage of the purge flowmeter. As the earliest manufacturer of domestic purge flowmeters, Changzhou Chengfeng Instruments hereby organizes some of the most ambiguous questions for everyone and conducts science popularization.
The purge flowmeter is different from the air blowing device. In general, the blowing device on the power plant's pulverized coal pipeline uses clean nitrogen and other inert gas to backfetch the pressure-recovery pipeline to prevent the pressure-reducing port from being blocked by the coal dust. In addition to this effect, the purge flow meter has more effects. The purge flow meter produced by our company utilizes a constant flow valve in combination with a metal tube float flow meter and a glass rotor flow meter to achieve flow measurement and ensure constant output of the flow. Can be used to measure gases, liquids. The flow meter measures the flow of the purge medium instead of purging the flow meter. For inlet and outlet pressure changes, the use of a purge flow meter ensures constant output.
Changzhou Chengfeng Purge Flowmeter is equipped with a constant flow valve with RE type with constant inlet pressure change and RA type with constant outlet pressure change. In the actual use of customers, there are several branch flows in the main pipe, if it is closed The branch pipelines will cause changes in flow due to changes in other branch pressures, such as the installation of purge flow meters, which will maintain the output flow rate. When the outlet pressure changes, it can be used together with the differential pressure transmitter to determine the liquid level and the liquid density.
Changzhou Chengfeng Purge Flowmeter has two types of single-table and panel type. The panel type is available in one-way, two-way, or multi-way, equipped with filters and pressure gauges. Material is 304 stainless steel and 316, 316L stainless steel, the connection can be customized according to customer needs.
So must the purge flow meter be used? According to customer site requirements. Accurate and stable measurement requirements, users of high liquid level requirements, it is recommended to use.
Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Tungsten carbide roller material design
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
Tungsten carbide roller category
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide composite roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide roller production process control
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.
Carbide Roller,Carbide Ring,Mill of Rolling Line,Steel Wire Rod,Mill Rolling Finish Stand,Mill Roller Groove Type
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