Hightop rollers have made outstanding contributions to road construction. From the first manpower to the current machinery, science and technology are developing. Hightop rollers are also making continuous progress. Characters and things are created from nothing. Hightop rollers will talk about the history and development of rollers today.
When it comes to road rollers, I have to give a brief introduction to the development of compaction technology. As early as in ancient times, people used the hoof feet of herds to trample, rub and compact the soil to treat the foundations of houses and compact the dam. Before the middle of the 19th century, road engineering in the West mainly used gravel for paving. The compaction mainly relied on natural rolling by vehicles. It was not until the invention of the stone rolling machine in 1858 that the development of gravel roads was promoted. Gradually, a horse-drawn roller was used for compaction work. This was the earliest prototype of a road roller. In 1860, a steam roller appeared in France, which further promoted and improved the construction technology and quality of the gravel pavement and accelerated the progress. At the beginning of the 20th century, the world recognized that the gravel pavement was the best pavement at that time and was promoted globally. The concept of compaction gradually became known, and road rollers also appeared on various road construction sites. In the middle of the 19th century, the internal combustion engine Inventions brought great vitality to the development of compaction equipment. The first internal combustion engine driven road roller was born in the early 20th century. Then came the tire roller. The sheep's foot roller and the smooth roller were produced almost at the same time. People have studied the compaction effect of the static roller roller. It is believed that increasing the weight of the roller can increase the linear pressure of the roller, thereby increasing the pressure. Actual effect. Therefore, for a long period of time, people have been committed to the development of large-tonnage rollers. The largest tire rollers used to weigh more than 200 tons. However, during this period, the changes in the rollers were mainly reflected in the improvement of power and appearance.
Technological development
In the 1970s, with the development of hydrostatic transmission technology, hydraulic control technology and computer technology, the research of compaction technology and compaction equipment made great progress. First of all, hydrostatic transmission is applied to compaction machinery. Through the control of hydraulic system flow, the speed of the motor can be easily changed to achieve continuous adjustment of the vibration frequency of the roller, thus greatly simplifying the complex transmission system. During this period, the research on vibratory rollers mainly focused on the optimization of the parameters of the vibratory roller, and gradually realized the stepless continuous adjustment of the vibration frequency and vibration amplitude, which improved the compaction effect.
Development profile
Road rollers and other construction machinery are products that are capital-intensive, technology-intensive, and have a strong relationship with related industries. They involve a wide range of technologies and a wide range of businesses. The improvement of the technical content of the OEM products requires the close cooperation of many supporting manufacturers, about 60%- 70% of the supporting parts need to be provided by professional factories. The main content of the main machine of the roller is the overall design of the product, the manufacture of structural parts, the purchase and assembly of product accessories.
After more than 40 years of continuous development, China's road roller industry has made considerable progress. Especially since the 1990s, the production and sales of road rollers have grown rapidly, and the number of companies joining the production of road rollers has continued to increase, bringing more than 80 road roller manufacturers to produce 5-30t vibratory rollers, 4-24t static roller rollers and 16-30t tires. A series of products with relatively complete specifications and varieties such as road rollers have basically formed a complete road roller manufacturing system capable of independent development and production, and the gap between its technical level and the international advanced level is gradually narrowing. This rapid growth situation is bound to push the roller accessory industry to a new period of development.
2007 is an important year in the national "Eleventh Five-Year Plan". Highway construction has been further increased, and road construction in various places has been advanced, which to a certain extent stimulated the increase in market procurement demand. In 2007, the sales of national road rollers reached 9,841 units, continuing. The growth trend has been improved.
The sales volume of road rollers continued to increase. From January to June, 18 road roller companies sold a total of 6,086 road rollers. Sales of major products increased by 16.43% over the same period in 2007.
Facing the increasingly optimistic Chinese market, the world's famous roller manufacturers have set up factories or sales offices in China. This has not only improved the overall design and manufacturing level of Chinese road rollers, but also caused fierce competition in the domestic market. Foreign companies have increased their market share in China's high-end products year by year with good product quality and diversified varieties. Domestic competition has evolved into a real "world war". The original balance pattern of the domestic road roller industry is disintegrating, and the subdivision of the domestic market territory has been in full swing.