1. Domestic level and development direction
The milling machine production in China started late, and it was only developed in the early 1980s. There are two main structural forms: one is to install a milling device on the agricultural wheel tractor to form a simple cold milling machine, which has a simple structure. It is suitable for the milling of asphalt pavement below medium strength. Secondly, the self-propelled cold milling machine has developed in the past two years. The performance of the main models has fully met the maintenance requirements of domestic high-grade highways and municipal roads. Good performance and price ratio have a greater competitive advantage than imported products, but there are still large gaps in terms of variety specifications, technical level and supporting parts.
At present, domestically produced models have borrowed more from the technology and experience of European milling machines. They have adopted international support in power, hydraulic and control systems. It can be said that the system configuration has reached the international advanced level. From the perspective of intellectual property rights, some domestic products such as CM2000 produced by Shaanxi Construction Machinery Co., Ltd. and CM1900 and CM1200 produced by Xi'an Hongda Transportation Technology Co., Ltd. not only have complete intellectual property rights, but also in the whole system and control system. The software design and manufacturing process have reached the international advanced level.
In the future market competition, China's milling machine manufacturers should give play to the following advantages: 1. Utilize the favorable conditions for China's accession to the WTO, establish international design ideas, strengthen international technical cooperation, and maintain technical and international development. Horizontal synchronization, strive for a larger high-end product market; 2 to take advantage of localization, to provide users with timely comprehensive services from complete machine technology to spare parts supply; 3 use the low labor conditions of China's labor, reduce the cost of the whole machine, Give full play to price advantage, strive for more middle and low-end users, and expand the market; 4 pay attention to research and development of proprietary technologies and product lines that meet the characteristics of China's roads, serve highway maintenance projects, and promote technological advancement in China's highway transportation industry.
2. Foreign level and development trend
The development and engineering application of foreign road milling machines has a long history and accumulated rich experience. It has formed the European style represented by the German Wirtgen products and the products of American RoadTech, CMI and Caterpillar. To represent the North American style. They work in the same way and process, and the installed capacity of the engine is basically the same. The difference is that the milling machine in Europe adopts four-track walking mode. The shape is compact and compact, and more electronic control technology is used, especially the current digital electronic network control. Technology; while North American milling machines use three-track walking, the shape is rough and more sturdy. Table 2 lists the main technical parameters of several typical foreign products.
The road milling machine technology in foreign countries has reached a high level of technology, and it has the following characteristics.
1. Advanced and reasonable chassis structure The chassis of the milling machine is mainly composed of a fully rigid frame and a four-wheeled walking structure. The driving and steering modes are mainly hydrostatic transmission.
2, give full play to the optimal milling power The automatic hydraulic power regulator on the milling machine can control the milling speed of the milling rotor according to the hardness of the pavement material and the milling depth, and then automatically adjust the milling rotor speed and the milling machine walking speed, so that The milling machine is always in maximum power utilization and does not overload.
3. The engine power is increased. The new milling machine with the same milling width is getting more and more power and the production efficiency is improved.
4. Large milling depth The new milling machine has a milling depth of more than 300 mm, which makes it possible to mill the full thickness of the entire roadway.
5. Milling rotors with good performance Most cold milling machines fix the milling head on several semi-circular tiles and adjust the milling width of the milling machine by how much the tiles are mounted on the rotor.
6. Simple milling load The rear end of the milling machine can be used to complete the fast material collection and load the milling object into the carrying vehicle. The discharge height is adjusted by the hydraulic mechanism, and the conveyor belt can be swung 40°~50° to the left and right, thereby realizing roadside charging.
7. A large number of advanced technologies such as all-wheel drive technology and electromechanical and hydraulic integrated control technology, intelligent fault diagnosis and maintenance system, precise automatic leveling system, safety self-protection system and automatic power distribution system are adopted.
8. The volume of the large-capacity container water tank and diesel tank is larger. When the machine is working, the fuel and cooling water are filled for a long interval and the standby time is short.
9. Modular design of the engine and its peripheral components - hydraulic pump, hydraulic valve and cooling system are all installed on the same chassis, all solenoid valves are assembled on the same distribution valve, easy to adjust, detect and repair.
Abrasive flap discs, commonly known as flat emery cloth wheels, flap discs, flower impellers or elastic discs, are a large variety of coated abrasive conversion products. It is a method of pressing the cut coated abrasive discs one by one. It is formed by sticking adhesive to the back cover plate along the circumference.
The Flap Disc is mainly installed on hand-held Power Tools for grinding and polishing the welds, burrs, chamfers, surface derusting, surface polishing, etc. of various metal and non-metal parts. Compared with the resin grinding wheel for fixed abrasives, it has Grinding and polishing can be completed at one time, shortening the operation time, saving the cost of grinding, and improving the grinding efficiency. The abrasive self-sharpness is strong and the utilization rate is high. The air cooling does not damage the surface. The surface quality is easy to control and cost-effective, reducing operator fatigue and increasing machine life. And so on, so it is widely used in various industries or fields of manufacturing.
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Abrasive flap disc can be divided into flap disc, Mini Flap Disc and Flexible Flap Disc according to their shape. There are subtle differences in usage. The flap disc are relatively hard and not easy to bend; the blades of flexible flap disc can be bent at will. Shape, suitable for grinding the edges and corners of the workpiece; mini flap disc is suitable for grinding smaller workpieces. The following is a detailed introduction of the flap disc.
According to the different abrasives, it can be divided into Zirconia Flap Disc,S/C Flap Disc, Ceramic Flap Disc.
1.Zirconia Flap Disc
Mainly used for high alloy, stainless steel and heat-treated steel; high-tensile, non ferrous metals.
2.S/C Flap Disc
Mainly used for marble, stone, glass, and non-ferrous metals.
3.Ceramic Flap Disc
Mainly used for grinding stainless steel, titanium, inconel, and other hard metals.
At present, flap discs are widely used in automobiles, stainless steel products, metal products, glass manufacturing and other industries, and have special effects on welds, solder joints, flash, rust removal and surface polishing. The reason why the flap disc is so widely used is because it has five advantages that cannot be ignored:
1. The flap disc blades have high hardness, high strength and strong grinding ability during use.
2. The flap disc has low noise, low vibration and long service life during use.
3. The flap disc has strong wear resistance and long service life.
4. It is not easy to generate heat and burn parts during use.
5. The use of flap disc can improve work efficiency.
The flap disc blades can be used instead of resin Grinding Wheels and steel wire wheels. They have a good effect on rust removal, grinding and polishing. It is a good way to polish and remove rust. It is worth choosing!
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