1. Classification and characteristics of road rollers
Road roller, also known as compactor, is a kind of equipment for road repair. Road rollers belong to the category of road equipment in construction machinery. They are widely used in filling compaction operations of high-grade highways, railways, airport runways, dams, stadiums and other large engineering projects. They can roll sandy, semi-cohesive and cohesive soils, Subgrade stabilized soil and asphalt concrete pavement layer. The roller is suitable for various compaction operations by the gravity of the machine itself, so that the compacted layer will be permanently deformed and compact. Road rollers are divided into two types: steel wheel type and tire type.
According to the classification of the roller: the structure of the roller includes smooth roller, groove roller and sheep foot roller. Smooth rolling is the most common application, mainly used for pavement surface compaction. Using mechanical or hydraulic transmission, it can concentrate the strength to compact the protruding parts, and the compaction has high flatness, which is suitable for asphalt pavement compaction operations.
Classified by axle: According to the axle arrangement, there are single axle single wheel, double axle double wheel, double axle three wheel and three axle three wheel. With internal combustion engine as power, mechanical transmission or hydraulic transmission is adopted. Generally the front wheels are steered, with good maneuverability and rear-wheel drive. In order to improve the steering and rolling performance, articulated steering structure and all-wheel drive should be adopted. The front wheel frame and the frame are hinged to reduce the body swing when the road is uneven. The rear wheel and the frame are rigidly connected. It adopts hydraulic control and hydraulic cylinder to control the steering. The front and rear rollers are equipped with scrapers to remove the sticky substance on the rollers. It is also equipped with a water spray system, which is used to spray water on the roller to prevent the asphalt mixture from sticking when compacting the asphalt pavement. In order to increase the force, iron, sand, water, etc. can be added to the roller to increase the weight.
With the development of modern industry, self-propelled rollers are widely used in highway engineering, and then developed to the current vibratory rollers all over the construction site. Once the vibratory roller appeared, it quickly gained popularity with its high productivity and excellent performance. In addition, the tire roller in the static roller has been developed together with the vibratory roller due to its special performance and professional use. With the development of expressway construction, there are also impact rollers specially used for impact compaction, whose impact force can reach about 200t.
2. Development status of road roller industry
1. Sales of road rollers
The road roller is a very important compaction machine in road engineering. It uses special steel wheels or smooth tires as operating devices to compact the earth and stone and pavement materials in various large-scale projects. After compaction, the compactness of the working face is improved, the structural strength and rigidity are improved, and the ability of the road to resist penetration is greatly enhanced. Therefore, the rapid development of my country's road roller market is inseparable from the continuous expansion of domestic road construction.
With the continuous development of the domestic economy and the country's heavy investment in infrastructure construction, my country's highway market has developed rapidly. In 2019, my country's completed highway construction investment was 2,189.5 billion yuan, an increase of 2.6% over the previous year. According to relevant data from the National Bureau of Statistics, my country's highway mileage has reached 5.0125 million kilometers in 2019, which is an increase of 3.43% compared with the mileage of 4.8465 million kilometers in 2018. Among them, the highway mileage of high-speed grade roads is 149,600 kilometers.
Road rollers are essential tools in road construction. Due to the continuous development of my country's highway industry, the market demand for road rollers continues to expand, thereby promoting the rapid development of the road roller market.
In 2018, the sales volume of China's road rollers was 18,376 units, an increase of 995 units over the previous year, an increase of 5.48% year-on-year; in 2019, the sales of China's road rollers were 16,978 units, an increase of 995 units over the previous year, a year-on-year decrease of 7.61%.
In terms of model structure, mechanical single-drum rollers still accounted for the largest market share in 2019, with a market share of 31.32%, followed by fully hydraulic single-drum rollers and light rollers, with a share of 23.35% and 20.98%, respectively.
2020 is the end year of building a well-off society in an all-round way and the "Thirteenth Five-Year Plan". We will stick to the word "stability" throughout the end of the year. It is necessary to focus on the long-term development of the country, strengthen the construction of strategic and network-based infrastructure, promote the construction of major projects such as the Sichuan-Tibet Railway, steadily promote the construction of communication networks, accelerate the implementation of major natural disaster prevention and control projects, and strengthen the municipal pipeline network, urban parking lots, and cold chains. The construction of logistics and other facilities will speed up the construction of rural roads, information and water conservancy facilities. The construction of these projects is inseparable from the confidentiality of road rollers. In view of the three consecutive months of upward momentum in the sales of road rollers, the sales of road rollers may reach a turning point in 2020.