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14

2022-11

Key Points of Small Roller in Subgrade Construction

Small road roller plays an important role in road construction, in different stages of construction, there are different points of attention. The following is a small road roller manufacturers to introduce the key points of subgrade construction, hoping to help you. 1. When using small road rollers for subgrade construction, it is necessary to ensure good drainage facilities to avoid water immersion. 2, subgrade filling before the embankment construction first put the boundary, remove the topsoil to the side line, fill the hole leveling and compaction, embankment stability without subsidence. 3. Small roller manufacturers remind you that the roadbed filler must be selected to ensure the stability of the soil and the strength and particle size can meet the construction requirements. 4, embankment filling ladder overlap each other new and old interface to connect, slope excavation steps, sectional filling left ladder, while the construction layer is stacked. 5, different soil mixed embankment embankment fill is not the same, according to the soil quality of the layer, strength permeable as the basis, to prevent the subgrade instability.

2022-11-14

14

2022-11

Method of polishing and grinding

Method of polishing grinding: Grinding is the grinding tool (hereinafter referred to as the grinding tool) surface embedded abrasive or coated abrasive and add lubricant, under certain pressure, the tool and the grinding tool contact and do relative movement, through the abrasive action, from the workpiece surface cut a layer of very thin chip, so that the workpiece has a precise size, accurate geometry and high surface roughness. Its essence is to use free abrasive particles to carry out micro-cutting including physical and chemical comprehensive effects on the surface of the workpiece through the grinding tool. Features:(1) In mechanical grinding, the machine tool-tool-workpiece system is in an elastic floating state. (2) The workpiece to be ground is not subject to any force and is therefore in a free state. (3) The speed of the grinding movement is usually below 30 m/min, which is about 1% of the grinding speed. (4) When grinding, only a very thin layer of material can be cut off, so the heat generated is less, the processing deformation is small, and the surface deterioration layer is also thin. (5) There is residual compressive stress on the grinding surface, which is beneficial to improve the fatigue strength of the workpiece surface. (6) The operation is simple and generally does not require complicated and expensive equipment. (7) Adaptability is good. (8) grinding can obtain very low surface roughness. 1. Fluid polishing Fluid polishing is to rely on high-speed flow of liquid and abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Commonly used methods are: abrasive jet processing, liquid jet processing, fluid power grinding. Fluid power grinding is driven by hydraulic pressure, The liquid medium carrying the abrasive particles is caused to flow back and forth at high speed over the surface of the workpiece. The medium mainly uses special compounds with good flowability at lower pressure. (polymer-like substance) and mixed with abrasive, abrasive can be used silicon carbide powder. 2. Mechanical polishing Mechanical polishing is a method of polishing a smooth surface by cutting and plastic deformation of the surface of the material to remove the convex part after polishing, Generally use oilstone, wool wheel, sandpaper, etc., mainly manual operation, special parts such as the surface of the rotary body, Auxiliary tools such as turntables can be used, and the method of super-lapping can be used for high surface quality requirements. Super lapping is a special abrasive tool, In the polishing liquid containing abrasives, it is tightly pressed on the surface of the workpiece to be processed for high-speed rotating motion. Using this technology, the surface roughness of Ra0.008 μm can be achieved, which is the highest among various polishing methods. Optical lens molds often use this method. 3. Ultrasonic polishing The workpiece is placed in the abrasive suspension and placed together in the ultrasonic field, relying on the oscillation of the ultrasonic, The abrasive is ground and polished on the surface of the workpiece. Ultrasonic machining macro force is small, will not cause deformation of the workpiece, but tooling production and installation is difficult. Ultrasonic machining can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution, The dissolution products on the surface of the workpiece are separated, and the corrosion or electrolyte near the surface is uniform; Ultrasonic cavitation in the liquid can also inhibit the corrosion process, conducive to surface brightening. 4. Electrolytic polishing The basic principle of electrolytic polishing is the same as chemical polishing, that is, by selectively dissolving the small protruding parts of the surface of the material, Make the surface smooth. Compared with chemical polishing, the effect of cathode reaction can be eliminated, and the effect is better. The electrochemical polishing process is divided into two steps: (1) Macroscopic leveling dissolution products diffuse into the electrolyte, and the geometric roughness of the material surface decreases, Ra> 1μm. (2) micro light level anode polarization, surface brightness, Ra <1μm. 5. Fluid polishing Fluid polishing is to rely on high-speed flow of liquid and abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Commonly used methods are: abrasive jet processing, liquid jet processing, fluid power grinding. Fluid power grinding is driven by hydraulic pressure, The liquid medium carrying the abrasive particles is caused to flow back and forth at high speed over the surface of the workpiece. The medium is mainly made of special compounds (polymer-like substances) with good flowability at lower pressure and mixed with abrasives, The abrasive may use silicon carbide powder. 6. Chemical polishing Chemical polishing is to make the surface of the material in the chemical medium micro convex part of the concave part of the preferential dissolution, A smooth surface is thus obtained. The main advantage of this method is that it does not require complex equipment and can polish workpieces with complex shapes, Many workpieces can be polished at the same time with high efficiency. The core problem of chemical polishing is the preparation of polishing solution. Surface roughness obtained by chemical polishing Generally, it is several 10 μm. 7. Magnetic grinding and polishing Magnetic grinding and polishing is the use of magnetic abrasive under the action of a magnetic field to form an abrasive brush to grind the workpiece. This method has high processing efficiency, Good quality, easy control of processing conditions, good working conditions. With suitable abrasives, the surface roughness can reach Ra0.1 μm. The polishing in plastic mold processing is very different from the surface polishing required in other industries, Strictly speaking, the polishing of the mold should be called mirror processing. It not only has the very high request to the polishing itself but also to the surface flatness, There are also high standards for smoothness and geometric accuracy. Surface polishing is generally only required to obtain a bright surface. The standard of mirror processing is divided into four levels: AO = Ra0.008μm, A1 = Ra0.016μm, A3 = Ra0.032μm, A4 = Ra0.063 μm, due to electrolytic polishing, fluid polishing and other methods are difficult to accurately control the geometric accuracy of the part, The surface quality of chemical polishing, ultrasonic polishing, magnetic grinding polishing and other methods can not meet the requirements, so the mirror processing of precision molds Or mainly mechanical polishing.

2022-11-14

14

2022-11

Use Scheme of Meitengqi Road Roller

The machine features: small size, compact structure, foldable operating handle to the operator to bring a comfortable operating environment, easy to transport and storage after folding. It can be used with large road roller. Widely used in large roller auxiliary (roadbed, foundation surface, asphalt surface) sidewalk, manhole cover perimeter, shoulder, small-scale paving works, road surface after landfill compaction road potholes repair, highway repair, backfill soil compaction, small parking lot, stadium compaction. Is the highway, municipal departments to build roads, square ideal equipment.

2022-11-14

11

2022-11

China's laser cutting machine industry sales reached 55000 units

China's laser cutting machine industry sales reached 55000 units Cutting machine from the cutting material to distinguish, divided into metal material cutting machine and non-metallic material cutting machine. Non-metallic material cutting machines are divided into flame cutting machines, plasma cutting machines, laser cutting machines, water jet cutting machines, etc.; metal material cutting machines are mainly tool cutting machines. Cutting machine from the control mode to distinguish, divided into CNC cutting machine and manual cutting machine. CNC cutting machine is to use digital program to drive the machine tool movement, with the machine tool movement, random with the cutting tool to cut the object. This mechanical and electrical integration of the cutting machine is called CNC cutting machine. The laser cutting machine is the fastest in efficiency, the highest in cutting accuracy, and the cutting thickness is generally small. Plasma cutting machine cutting speed is also very fast, the cutting surface has a certain slope. Flame cutting machine for large thickness of carbon steel material. Cutting machines are applied to metal and non-metal industries. Generally speaking, non-metal industries are divided into detailed categories, such as stone cutting machines, water cutting machines, saw tooth cutting machines, laser cutting machines for cutting cloth and plastic, chemical fiber products, blade cutting machines, flame cutting machines, flame cutting machines for cutting metal materials, plasma cutting machines and flame cutting machines, which are divided into two categories: numerical control cutting machines, manual ones, small sports cars, semi-automatic ones, pure manual, CNC, gantry CNC cutting machine, cantilever CNC cutting machine, desktop CNC cutting machine, intersecting line CNC cutting machine and so on. With the development of modern machinery processing industry, the requirements for cutting quality and accuracy are continuously improved, and the requirements for improving production efficiency, reducing production costs, and having highly intelligent automatic cutting functions are also increasing. The development of CNC cutting machine must adapt to the requirements of the development of modern machinery processing industry. Laser cutting machine has become one of the most popular means of processing, in recent years the momentum of development is indeed rapid. The country is also the emergence of a lot of large laser cutting machine brand. The equipment manufacturing industry is called "industrial mother machine" and is at the high end of the value chain and the core link of the industrial chain. It not only provides technical equipment for the development of various sectors of the national economy, but also plays an important role in the economic chain. To seize the laser is to seize the core and future direction of the development of the intelligent equipment industry. CNC laser cutting machine in China's automobile, elevator manufacturing, packaging machinery, textile machinery, electrical switchgear, aerospace and other industrial sectors of the sheet metal processing field has achieved a more successful application, but in shipbuilding, construction machinery, etc., thick plate cutting a large amount of industry application is very small, in contrast, at this point the gap between China and the industrial advanced countries is even greater. At the same time, this reality indicates that the market potential of high-power and large-scale CNC laser cutting machine with excellent performance, competitive price, and capable of medium and thick plate cutting is extremely huge in China in the future. With the development of modern machinery processing industry, the requirements for cutting quality and accuracy are continuously improved, and the requirements for improving production efficiency, reducing production costs, and having highly intelligent automatic cutting functions are also increasing. The development of CNC cutting machine must adapt to the requirements of the development of modern machinery processing industry. Cutting machine is divided into flame cutting machine, plasma cutting machine, laser cutting machine, water cutting and so on. The laser cutting machine is the fastest in efficiency, the highest in cutting accuracy, and the cutting thickness is generally small. Plasma cutting machine cutting speed is also very fast, the cutting surface has a certain slope. Flame cutting machine for large thickness of carbon steel material. Data show that China's laser cutting machine sales from 4700 units to 55000 units, the annual sales compound growth rate of up to 51%, the growth rate is still rising. Policies and regulations such as "Made in China" and "Intelligent Manufacturing Development Plan" clearly put forward that "accelerating the development of intelligent manufacturing equipment", "promoting intelligent transformation in key areas", and "promoting intelligent transformation of small and medium-sized enterprises" are included in the ten key tasks. On the one hand, the wide application of intelligent cutting equipment is the concrete manifestation of the development of intelligent equipment in China. On the other hand, the promotion of intelligent cutting equipment is also conducive to the transformation of the industry and the transformation of small and medium-sized enterprises, and provides help to promote the sound development of the economic structure. In recent years, a small number of domestic enterprises through the continuous deepening of technical research, the production of intelligent cutting equipment products compared to similar foreign enterprises, has a certain competitive strength. In addition, compared with foreign products, products produced by domestic manufacturers have a strong cost-effective advantage. In the future, with the further strengthening of the role of made in China in the international market, intelligent cutting machine products will enhance the brand effect in the world.

2022-11-11

11

2022-11

Xi Jinping: Let opening up bring new bright future to global development

Xi Jinping: Let opening up bring new bright future to global development At present, the world has not changed in a century to accelerate the evolution of the world economic recovery momentum is insufficient. In his speech at the opening ceremony of the Fifth China International Import Expo, General Secretary Xi Jinping emphasized that opening up is an important driving force for the progress of human civilization and the only way for the prosperity and development of the world. We must use openness to alleviate the difficulties of development, use openness to pool the power of cooperation, use openness to gather the momentum of innovation, and use openness to seek shared blessings, so as to promote the continuous advancement of economic globalization, enhance the development momentum of all countries, and make development results more and more Equally benefit the people of all countries. The Party Building Network has combed some important discussions related to General Secretary Xi Jinping and invited you to study together. On the evening of November 4, 2022, Xi Jinping attended the opening ceremony of the Fifth China International Import Expo in Shanghai by video and delivered a speech entitled "Creating an Open and Prosperous Future Together. Photo by Xinhua News Agency reporter Li Xueren The purpose of holding the Expo is to expand the opening up and make China's big market a big opportunity in the world. Five years ago, I announced that the purpose of holding the Expo was to expand the opening up and make China's big market a great opportunity for the world. Now, the CIIE has become a window for China to build a new development pattern, a platform to promote high-level openness, and an international public product shared globally. -- On November 4, 2022, Xi Jinping's speech at the opening ceremony of the Fifth China International Import Expo We must implement the new development concept completely, accurately and comprehensively, adhere to the direction of socialist market economy reform, adhere to a high level of opening up to the outside world, and accelerate the construction of a new development pattern with the domestic cycle as the main body and the domestic and international double cycle promoting each other. -- October 16, 2022, Xi Jinping's report at the 20th National Congress of the Communist Party of China On July 21, 2020, Xi Jinping hosted a symposium for entrepreneurs in Beijing and delivered an important speech. Photo by Xinhua News Agency reporter Yue Yuewei To ease the difficulties of development with openness, to pool the power of cooperation with openness, to gather the momentum of innovation with openness, and to seek the blessing of sharing with openness. Openness is an important driving force for the progress of human civilization and the only way for the prosperity and development of the world. At present, the world has not changed in a century to accelerate the evolution of the world economic recovery momentum is insufficient. We must use openness to alleviate the difficulties of development, use openness to pool the power of cooperation, use openness to gather the momentum of innovation, and use openness to seek shared blessings, so as to promote the continuous advancement of economic globalization, enhance the development momentum of all countries, and make development results more and more Equally benefit the people of all countries. -- On November 4, 2022, Xi Jinping's speech at the opening ceremony of the Fifth China International Import Expo From a long-term perspective, economic globalization is still a historical trend, and the division of labor and cooperation among countries, mutual benefit and win-win results are a long-term trend. We must stand on the right side of history, persist in deepening reform, expand opening up, strengthen open cooperation in the field of science and technology, promote the construction of an open world economy, and promote the construction of a community with a shared future for mankind. -July 21, 2020, Xi Jinping's speech at the Entrepreneur Symposium On October 14, 2020, the celebration of the 40th anniversary of the establishment of the Shenzhen Special Economic Zone was held in Shenzhen, Guangdong Province. Xi Jinping delivered an important speech at the meeting. Photo by Xinhua News Agency reporter Zhang Ling Steady expansion of rules, regulations, management, standards and other institutional openness China will promote all countries to share the opportunities of institutional opening up, steadily expand the institutional opening up of rules, regulations, management and standards, implement the new edition of the catalogue of industries to encourage foreign investment, deepen the construction of comprehensive demonstration areas for the expansion and opening up of the national service industry, implement the strategy of upgrading the free trade pilot zone, accelerate the construction of Hainan free trade port, and give full play to the role of a comprehensive experimental platform for reform and opening up. -- On November 4, 2022, Xi Jinping's speech at the opening ceremony of the Fifth China International Import Expo It is necessary to optimize and upgrade the production, distribution, circulation and consumption systems, deepen internal economic ties, increase economic depth, enhance the function of unblocking the domestic cycle and connecting domestic and international double cycles, accelerate the opening up of institutional systems such as rules and standards, and take the lead in building a new system of higher-level open economy. -- Xi Jinping's Speech at the Celebration of the 40th Anniversary of the Establishment of the Shenzhen Special Economic Zone, October 14, 2020 On the evening of November 4, 2022, Xi Jinping attended the opening ceremony of the Fifth China International Import Expo in Shanghai by video and delivered a speech entitled "Creating an Open and Prosperous Future Together. Photo by Xinhua News Agency reporter Gao Jie Provide new opportunities for the world with China's new development and promote the construction of an open world economy "There is no way out after the heavy mountains and rivers, and there is another village." The road is at your feet and the light is ahead. China is willing to work with other countries to practice true multilateralism, build more open consensus, jointly overcome the difficulties and challenges facing global economic development, and let openness bring new bright prospects for global development! -- On November 4, 2022, Xi Jinping's speech at the opening ceremony of the Fifth China International Import Expo China adheres to the basic national policy of opening up to the outside world, firmly pursues a win-win strategy of opening up, constantly provides new opportunities for the world with China's new development, and promotes the construction of an open world economy to better benefit the people of all countries. -- October 16, 2022, Xi Jinping's report at the 20th National Congress of the Communist Party of China

2022-11-11

11

2022-11

Meidengqi MG55 Heavy Duty Floor Grinder

Heavy ground grinding machine is mainly used for a wide range of ground grinding treatment, with fast speed, high efficiency, long time continuous work characteristics, mainly used for ordinary concrete floor processing, can effectively grind the surface laitance, can also be used to remove the old epoxy coating on the ground, is the best choice for the renovation of the coating ground. Heavy ground grinding machine is mainly used for a wide range of ground grinding treatment, with fast speed, high efficiency, long time continuous work characteristics, mainly used for ordinary concrete floor processing, can effectively grind the surface laitance, can also be used to remove the old epoxy coating on the ground, is the best choice for the renovation of the coating ground. Product Features: 1. Imported switch with overload protection has the function of phase loss and leakage protection. 2. Equipped with vacuum cleaner connection device to provide dust-free working environment. 3, fast speed, can work for a long time, high polishing efficiency. 4, can add 12kg of weight iron, can effectively polish the old epoxy floor. 5, can adjust the ground grinding depth. 6. There are four kinds of diamond grinding discs for selection: extra coarse, coarse, medium and fine. The extra coarse disc is especially suitable for removing the old epoxy ground. 7, you can choose the combination of cheap grinding block. 8. The shock absorption device designed by aviation rubber material is flexible and durable. 9. It has the function of fine grinding and derusting: it can chisel the topcoat, primer and oxide skin on the surface of the steel plate. As there are various derusting heads to choose from, it can be chiseled even if there are rust pits on the surface.

2022-11-11

11

2022-11

Method of polishing and grinding

Method of polishing grinding: Grinding is the grinding tool (hereinafter referred to as the grinding tool) surface embedded abrasive or coated abrasive and add lubricant, under certain pressure, the tool and the grinding tool contact and do relative movement, through the abrasive action, from the workpiece surface cut a layer of very thin chip, so that the workpiece has a precise size, accurate geometry and high surface roughness. Its essence is to use free abrasive particles to carry out micro-cutting including physical and chemical comprehensive effects on the surface of the workpiece through the grinding tool. Features:(1) In mechanical grinding, the machine tool-tool-workpiece system is in an elastic floating state. (2) The workpiece to be ground is not subject to any force and is therefore in a free state. (3) The speed of the grinding movement is usually below 30 m/min, which is about 1% of the grinding speed. (4) When grinding, only a very thin layer of material can be cut off, so the heat generated is less, the processing deformation is small, and the surface deterioration layer is also thin. (5) There is residual compressive stress on the grinding surface, which is beneficial to improve the fatigue strength of the workpiece surface. (6) The operation is simple and generally does not require complicated and expensive equipment. (7) Adaptability is good. (8) grinding can obtain very low surface roughness. 1. Fluid polishing Fluid polishing is to rely on high-speed flow of liquid and abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Commonly used methods are: abrasive jet processing, liquid jet processing, fluid power grinding. Fluid power grinding is driven by hydraulic pressure, The liquid medium carrying the abrasive particles is caused to flow back and forth at high speed over the surface of the workpiece. The medium mainly uses special compounds with good flowability at lower pressure. (polymer-like substance) and mixed with abrasive, abrasive can be used silicon carbide powder. 2. Mechanical polishing Mechanical polishing is a method of polishing a smooth surface by cutting and plastic deformation of the surface of the material to remove the convex part after polishing, Generally use oilstone, wool wheel, sandpaper, etc., mainly manual operation, special parts such as the surface of the rotary body, Auxiliary tools such as turntables can be used, and the method of super-lapping can be used for high surface quality requirements. Super lapping is a special abrasive tool, In the polishing liquid containing abrasives, it is tightly pressed on the surface of the workpiece to be processed for high-speed rotating motion. Using this technology, the surface roughness of Ra0.008 μm can be achieved, which is the highest among various polishing methods. Optical lens molds often use this method. 3. Ultrasonic polishing The workpiece is placed in the abrasive suspension and placed together in the ultrasonic field, relying on the oscillation of the ultrasonic, The abrasive is ground and polished on the surface of the workpiece. Ultrasonic machining macro force is small, will not cause deformation of the workpiece, but tooling production and installation is difficult. Ultrasonic machining can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution, The dissolution products on the surface of the workpiece are separated, and the corrosion or electrolyte near the surface is uniform; Ultrasonic cavitation in the liquid can also inhibit the corrosion process, conducive to surface brightening. 4. Electrolytic polishing The basic principle of electrolytic polishing is the same as chemical polishing, that is, by selectively dissolving the small protruding parts of the surface of the material, Make the surface smooth. Compared with chemical polishing, the effect of cathode reaction can be eliminated, and the effect is better. The electrochemical polishing process is divided into two steps: (1) Macroscopic leveling dissolution products diffuse into the electrolyte, and the geometric roughness of the material surface decreases, Ra> 1μm. (2) micro light level anode polarization, surface brightness, Ra <1μm. 5. Fluid polishing Fluid polishing is to rely on high-speed flow of liquid and abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Commonly used methods are: abrasive jet processing, liquid jet processing, fluid power grinding. Fluid power grinding is driven by hydraulic pressure, The liquid medium carrying the abrasive particles is caused to flow back and forth at high speed over the surface of the workpiece. The medium is mainly made of special compounds (polymer-like substances) with good flowability at lower pressure and mixed with abrasives, The abrasive may use silicon carbide powder. 6. Chemical polishing Chemical polishing is to make the surface of the material in the chemical medium micro convex part of the concave part of the preferential dissolution, A smooth surface is thus obtained. The main advantage of this method is that it does not require complex equipment and can polish workpieces with complex shapes, Many workpieces can be polished at the same time with high efficiency. The core problem of chemical polishing is the preparation of polishing solution. Surface roughness obtained by chemical polishing Generally, it is several 10 μm. 7. Magnetic grinding and polishing Magnetic grinding and polishing is the use of magnetic abrasive under the action of a magnetic field to form an abrasive brush to grind the workpiece. This method has high processing efficiency, Good quality, easy control of processing conditions, good working conditions. With suitable abrasives, the surface roughness can reach Ra0.1 μm. The polishing in plastic mold processing is very different from the surface polishing required in other industries, Strictly speaking, the polishing of the mold should be called mirror processing. It not only has the very high request to the polishing itself but also to the surface flatness, There are also high standards for smoothness and geometric accuracy. Surface polishing is generally only required to obtain a bright surface. The standard of mirror processing is divided into four levels: AO = Ra0.008μm, A1 = Ra0.016μm, A3 = Ra0.032μm, A4 = Ra0.063 μm, due to electrolytic polishing, fluid polishing and other methods are difficult to accurately control the geometric accuracy of the part, The surface quality of chemical polishing, ultrasonic polishing, magnetic grinding polishing and other methods can not meet the requirements, so the mirror processing of precision molds Or mainly mechanical polishing.

2022-11-11

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