A brief description of the Duba sprinkler
The Dura Sprinkler's folding chassis still uses the Dongfeng Dima Sprinkler's special chassis EQ1040TJ20D3, while the tires are made of large-sized tires, model 6.50-16. The engine of the Dura Sprinkler uses the "Yuchai high-pressure common rail fuel injection four-cylinder diesel engine" with a discharge standard of Guosan. The overall power is 66 kilowatts.
The tank of the Dura Sprinkler is a folding tank body. It adopts the technology of the domestic front end. The material is generally made of high-quality carbon steel plates, and sometimes 304 stainless steel (imported from South Korea) is selected according to the requirements of the guests. The capacity of the entire tank varies from 2 to 5 cubic meters. The shapes of the tanks are common oval and round tanks, and of course, there are also round tanks. The thickness standard of the can body plate is the same as the national standard, and the 4.0 carbon steel plate pressing technique is adopted, and a connecting device for observing the water level in the can is also designed at the place where the can body is sealed.
The Dribble sprinkler sprinkler pump won the first place in the quality assessment in China. It uses the Japanese Cheng Liwei high-power special sprinkler pump. It is equipped with fire joints, gravity valve and self-priming function, and can also be equipped with greening. Fire reel (20 meters long).
In the process of using the Duracell sprinkler, it is necessary to ensure that the power-retrieving device has been used to park the vehicle. If natural pools, such as river ditches and ponds, are drowning water sources, be sure to carefully observe whether or not all the fronts of the suction hoses of the sprinklers are in the water. If the pools are relatively shallow and you can dig deeper, remember that you must not inhale air to ensure The sprinkler works normally. In addition, the top of the suction pipe of the Duba Sprinkler will be equipped with a filtering device such as a strainer. This is to prevent inhalation of some sand, small stones, debris, etc., or more silt and bleaching debris when absorbing water. Do not remove the filter unit during water absorption. In addition, the suction pipe must be inspected before absorbing water. The entire water pipe system must be in a vacuum state before it can start absorbing water. If it leaks, it cannot suction the water.
For the maintenance of the Duba sprinkler, it must be noted that in the winter, the water in the pump pipe in the car should be drained. Otherwise, the freezing of water in the pipe when the temperature is too low can cause the vehicle pipe to be cracked.
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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