Whether it is farmers or consumers, they all want rice to be complete and white, so how can rice be used to get better quality rice? When rice is milled using a rice mill, we only need to pay a little attention to a few aspects. The milled rice will be white and complete, which will greatly improve the quality of rice.
In order to improve the quality of rice milling, the operator must pay attention to the two main adjustments of the rice milling machine during rice milling. One is the adjustment of the rice knife. It is mainly to adjust the gap between the rice knife and the roll. If the clearance is large, the pressure in the white room is small, and the friction force that the rice receives in the roll is weak, so that the rice cannot be ground and the milled rice is not white, but The rice rate is higher. The second is the adjustment of the inlet and outlet blades. When the inlet knife is opened and the outlet knife is turned off, the grains in the white room are increased, the pressure increases, and the milled beige is white, but the rice is more. On the contrary, if the inlet knife is closed, the outlet knife is opened. Large, milled white room saves less rice, the pressure is reduced, and the milled rice is rough.
In the food quality inspection, an indispensable instrument is the experimental rice grinding machine. The experimental rice grinding machine is composed of a shell, a drum, a rice knife, a processing bucket, a rice sieve, and the like. At work, the rice is poured into the hopper to open the inlet blade, and the rice flows into the space of the white room and the drum. Due to the rotation of the drum, rice was subjected to a great deal of squeezing force and friction, causing the husks to fall off and the husks to be finely ground and the rice grains to be whitened. Under the action of the continuous rotation of the drum, the rice grain is pushed to the outlet through the screw rack on the drum and flows out from the outlet blade. Gu Di leaked from the rice sieve into the bottom of the casing. LTJM-2099 rice mill, also called experimental rice mill, has high white output rate, small broken rice, large sample volume, simple and quick operation, and reflects the actual rice milling effect. It is grain inspection, scientific research, teaching, production, The necessary quality inspection instruments in the acquisition and other aspects.
Farmers like to use experimental rice mills to produce complete, white rice. However, rice milled by some rice mills has more broken and beige is not white. The reason for this is that in addition to rice quality problems (such as millet being flooded during harvesting and not dried after harvesting), the rice mill's entrance and exit gates and rice knives are not properly prepared, and the machine operators cannot skillfully operate the mill. Rice machine caused.
According to the above adjustment of the knife and the inlet and outlet blades and the relationship between the pressure and the friction force in the whitening room, it is necessary to grind the whole grain, white color, and the good quality rice can be adjusted and operated according to the following methods:
1. The gap between rice knives and drums should not be less than the transverse diameter of the rice. Otherwise, the rice is easy to break; the gap can not be larger than the longitudinal diameter of the rice, otherwise the rice grain is rough. Therefore, the rice knife gap should be selected between the vertical and horizontal diameters of rice. Practice has shown that the rice knife gap should be slightly beveled, that is, slightly larger at the end of the exit knife, so that the milled rice is more complete.
2. Import and export guillotine knife should match the opening degree of the general import guillotine blade and it can be controlled at 1/2 of the whole opening, up to no more than 2/3. Some of the old operators removed the imported blades and allowed all imports to open. Generally do not do this, because after all open, there are too many cereals, whitening chamber pressure is too high, large resistance to rotation, such as: If the exit knife is not a good fit, the belt will slip, even the machine will be stuck or damaged. The exit knife must be controlled flexibly. In operation, the opening of the rice knife gap and the entrance knife can be adjusted according to the regulations; it can be fixed; the hand only needs to operate the exit knife with the right hand, and the left hand extends the palm to the lower end of the outlet. Rice grain, see if the grain is complete, and whether the grain is white. If broken rice, can open a large exit knife. If the rice grain is rough, you can close the exit knife. Both should be taken into consideration until the quality of rice milling reaches the requirements.
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.
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