Recently, the Ministry of Industry and Information Technology quoted the consulting firm Gardner as the statistics. In the world's machine tool consumer market, China’s machine tool exports reached US$3.3 billion in 2014, accounting for less than 5% of the world’s machine tool consumption while Japan and Germany accounted for more than 10%. At the same time, a considerable number of high- and mid-range CNC machine tools that are urgently needed in China are dependent on imports. For example, imported vehicles account for more than 40% of imported equipment. China's high-end machine tool industry has a long way to go. The color mixer is a machine that uses mechanical force and gravity to evenly mix two or more materials. Color mixing machines are widely used in various industries and daily life. Mixer Material Machine,Vh Powder Mixer,Plastic Raw Material Mixer,Powder Mixer Ningbo Chenwei Machinery Technology Co.,Ltd , https://www.chenweimachinery.com
Recently, “Made in China 2025†listed CNC machine tools and basic manufacturing equipment as “strategic and strategic areas for accelerating breakthroughs.†It proposed to strengthen forward-looking deployment and breakthroughs in key technologies, actively plan to seize the commanding heights of future technology and industrial competition, and improve the international division of labor. Levels and discourse.
CNC machine tools and basic manufacturing equipment are the “working machines†of the equipment manufacturing industry. The technical level and product quality of a country’s machine tool industry are an important indicator of the development level of its equipment manufacturing industry. “Made in China 2025†will use CNC machine tools and basic manufacturing. The equipment industry is listed as one of the strategically contestable areas of China's manufacturing industry. The main reason is that it has an "anchorage" effect on the position of a country's manufacturing, especially equipment manufacturing, in the international division of labor: CNC machine tools and basic manufacturing equipment are manufacturing. The foundation of industry value generation and the fulcrum of the industry's leap are the core of the basic manufacturing capabilities. Only with a solid basic manufacturing capability can it be possible to produce advanced equipment products, thereby realizing the production of high-value products.
However, the relevant person in charge of the Ministry of Industry and Information Technology said that although China's machine tool industry occupies an important position in the world's machine tool industry system and the global machine tool market, it still cannot be counted as a machine tool powerhouse. Compared with the powerful machine tools in the world, China's machine tool industry still has a certain gap, especially in the competitiveness of medium and high-grade machine tools is not strong.
In addition to the lack of international competitiveness, the development of core components for domestic machine tools needs to be strengthened. At present, the functional components of domestic machine tools cannot satisfy the matching requirements of the main engine in terms of variety, quantity, and grade. The market share of domestically-made mid-range supporting functional components still needs to be improved.
In addition, the development pressure of China's machine tool industry remains high. According to the data released by Gardner Company in the United States, the global machine tool consumption in 2014 was USD 75.3 billion, which was only 0.3% higher than that in 2013. The global machine tool production declined for three consecutive years. In 2014, the global machine tool output value was USD 81.2 billion, which was 3.1% lower than 2013. %, China's CNC machine tool industry continues to operate under pressure, the overall decline. In 2014, the output of domestic metalworking machine tools fell by 2% year-on-year. At the same time, the demand for imported machine tools in the domestic market has risen. In 2014, the total import value of machine tools was US$17.78 billion, an increase of 10.8% year-on-year.
"This shows that the domestic machine tool industry is difficult to meet the high-end needs of enterprises, the domestic machine tool industry is subject to a cyclical pressure and structural pressure of the double stack, an urgent need to find new development breakthroughs." Ministry of Industry and relevant responsible person.
The color mixer can mix a variety of materials into a uniform mixture, such as cement, sand, crushed stone and water into wet concrete; It can also increase the contact surface area of materials to promote chemical reaction; It can also accelerate physical changes, such as adding solvent to granular solute, and accelerating dissolution and mixing through the action of mixing machinery.
Commonly used color mixers are divided into four categories: gas and low-viscosity liquid mixers, medium-high viscosity liquid and paste mixing machines, thermoplastic material mixers, and powder and granular solid material mixing machines. The gas and low viscosity liquid color mixing machine is characterized by simple structure, no rotating parts, small maintenance and low energy consumption. This type of mixing machinery is divided into four types: air flow mixing, pipe mixing, jet mixing and forced circulation mixing.
The color mixing machine of medium and high viscosity liquid and paste generally has strong shearing effect; Thermoplastic material mixer is mainly used for mixing thermoplastic materials (such as rubber and plastic) with additives; The mixing machines for powdery and granular solid materials are mostly intermittently operated, and also include machines with mixing and grinding functions, such as wheel rolling machines. During mixing, all materials involved in mixing shall be evenly distributed. The degree of mixing can be divided into three states: ideal mixing, random mixing and complete non-mixing. The mixing degree of various materials in the mixing machine depends on the proportion, physical state and characteristics of the materials to be mixed, as well as the type of mixing machine used and the duration of mixing operation.
The mixing of liquid mainly depends on the mechanical stirrer, air flow and the jet of the liquid to be mixed, so that the materials to be mixed are stirred to achieve uniform mixing. Stirring causes part of the liquid to flow, and the flowing liquid pushes the liquid around it, resulting in the formation of a circulating liquid flow in the solvent. The resulting diffusion between liquids is called the main body convection diffusion. When the liquid flow velocity caused by agitation is very high, there will be shear action at the interface between the high-speed liquid flow and the surrounding low-speed liquid flow, thus generating a large number of local vortices. These vortices spread rapidly around and bring more liquid into the vortex. The turbulent convection diffusion formed in a small range is called eddy diffusion.
The mixing mechanism of a small amount of insoluble powdery solid and liquid is different from the density component, and the mixing mechanism of immiscible liquid is the same, but stirring cannot change the particle size of powdery solid. If the settling velocity of solid particles cannot be less than the flow velocity of liquid before mixing, no matter what mixing method is used, it will not form a uniform suspension.
The mixing of different pastes is mainly to divide the materials to be mixed repeatedly and make them subject to the strong shearing effect caused by the actions of pressing, rolling, squeezing, etc., and then merge and knead repeatedly to reach the required mixing degree. This kind of mixing is difficult to achieve ideal mixing and can only achieve random mixing. The powdery solid is mixed with a small amount of liquid to form a paste, and its mixing mechanism is the same as that of paste material.