ngacrusher's blog
At this stage in China, many Sand Making Machine manufacturing are inseparable from the application of automation technology. At this stage, China's sand making machine manufacturing technology has achieved very good development, but compared with the mature countries of the sand making machine industry in the world, there is still a long way to go, China still has a long way to go. At present, China's sand making machine manufacturing technology is still in the primary stage of a sand making machine manufacturing in the world. The level of automation of sand making machine manufacturing is not very high, and the application scope of sand making machine manufacturing automation is not very extensive. In the western countries where the sand making machine manufacturing industry is very developed, there are three applications for sand making machine manufacturing. It is the integration of sand making machine manufacturing; the second is the intelligence of sand making machine manufacturing; the third is the virtualization of sand making machine manufacturing. Western sand making machine manufacturing developed countries have very common applications and promotion on these three issues. China's sand making machine manufacturing lags behind mature western countries in three aspects. One aspect is the innovative design of China's sand making machine manufacturing; the second aspect is the manufacturing technology of China's sand making machine manufacturing; the third aspect is the related management work in the manufacturing process of China's sand making machine. In view of the above-mentioned three gaps, China should attach importance to technological innovation, manufacturing method innovation and management model innovation in the sand making machine manufacturing process at this stage. Only in this way can we keep up with the development pace of mature western countries and upgrade our sand making machine. The level of manufacturing competition has given China's sand making machine manufacturing a certain foothold in the world.
As a crushing machine developed in the 1980s, it has been widely used in sand quarries, and is considered to be an effective sand making equipment by users. It is usually called a sand making machine. The impact crusher uses the diameter of the impeller as the standard to divide the specifications, and is divided into open type and closed type according to the impeller form. According to whether the shell is equipped with a counterattack, it can be divided into two types of crushing methods, namely stone-on-stone and stone-on-iron, so that it is combined into 4 basic forms. From an international perspective, the mature technology of Impact Crusher is reflected in three aspects: flexible mechanical properties, good wear-resistant materials and parts design, and effective dust control. For the domestic market, at least the first two are common. (A) technical performance The open impeller will allow 100-150mm feed granularity, and there is no commercial open impeller impact crusher available to the market in China. Therefore, the domestic vertical shaft impact crusher can only be used as a three-stage or four-stage crushing equipment in a sand and gravel yard, but not as a two-stage crushing equipment as abroad. Foreign companies have equipment with impeller diameters up to 1.6m and supporting motor power Shibang1103kW, which are suitable for various large production lines, while domestic impact crusher specifications rarely exceed 1.2m. Mature impeller channels can be changed between 3-7, with different structures and different speeds to adapt to different materials and feed grain levels, to achieve higher sand production capacity and the need for fineness modulus, and The domestic closed rotor is basically fixed to 4 channels and rarely changes, so the adaptability to different working conditions is poor.
Many parts of the cement rotary kiln require the use of refractory materials, such as smoke chambers, kiln head covers, grate coolers, tertiary air ducts, etc. The smoke chambers generally use high alumina refractory castables, crust-resistant castables, Calcium silicate board, kiln head cover uses high-aluminum high-strength castable, calcium silicate board, grate cooler uses vault alkali-resistant brick, high-alumina refractory castable, steel fiber reinforced castable and other refractory materials Then, what kind of performance do these refractory materials need to meet the production requirements? Let's take a look together.
1.High temperature resistance
In general, the fire resistance of alkaline bricks used in fired belts is as high as 1750 to 1790 degrees, so in general, the fire resistance of fired materials used in fired belts should be 1730 degrees.
2, easy to hang the kiln skin
For the new dry-process Quartz Grinding Machine , if there is no kiln skin to protect its alkaline bricks, it will cause cracking and spalling because the temperature difference stress in the brick is too large, because the flame temperature in the new dry-process rotary kiln is higher than 1700 ° C. The kiln skin protects the alkaline transition. When the temperature of the kiln changes frequently, the kiln skin is not easy to hang, which will make the alkaline bricks often exposed, which will greatly reduce the life of the alkaline transition.
3. Chemical resistance
Refractory materials must have good chemical resistance. The clinker and kiln skin are still sintered into the refractory bricks after melting at high temperature, because the clinker or kiln skin is chemically characterized by strong alkalinity. We all know that strong chemical attack will change the chemical composition of refractory materials. Especially when the material in the firing zone contains about 20-25% liquid phase. At the same time, the gases produced by combustion and sulfur, chlorine, and alkali volatilized from clinker will also attack various refractory materials.
4. Thermal shock stability
The refractory used must have good thermal shock stability, because under normal circumstances, the refractory in the kiln will be exposed to the hot kiln gas once every turn of the rotary kiln, and the rest will be covered by the material. This will cause the surface temperature of the refractory material in the kiln to be periodically fluctuated, which requires the refractory material to have high thermal shock stability.
In addition to the above points, refractory materials are required to have higher mechanical strength, lower thermal expansion coefficient, and lower porosity.
