What Is a Steam Roller?

A tire roller is a machine that compacts the road with multiple pneumatic tires. Tire rollers use pneumatic tires, which are generally equipped with 3 to 5 front wheels and 4 to 6 rear wheels. If you change the inflation pressure, you can change the ground pressure. The pressure adjustment range is 0.11 to 1.05 MPa.

In engineering examples, especially some older construction workers, tire rollers are often referred to as rubber rollers. It is suitable for compacting various materials such as base layer, sub-base layer and asphalt surface layer. It is an indispensable compaction machine for highway, municipal and national defense construction. It has the following characteristics:

1. The specific ground pressure can be adjusted by increasing or decreasing the weight and tire pressure to adapt to the compaction of different materials. 2. The Cummins 6BTA engine is adopted, which is powerful and suitable for various construction conditions. 3. Three forward speeds and two reverse speeds. The speed can be changed between 5.33-22.05km / h to facilitate construction and transfer. 4. The front wheel adopts mechanical swing type suspension device. 5. With service brake and parking brake, the braking performance is reliable. 6. The panoramic cab with wide field of vision has better sound insulation and vibration reduction effects. The overhead exhaust and retractor make driving more comfortable. 7. According to user needs, can be equipped with air-conditioning. ^[1]

When it comes to road rollers, I have to make a brief introduction to the development of compaction technology. As early as ancient times, people used the hoofs and feet of herds to trample, rub and compact the soil to treat the foundation of houses and compact the dam. Hehe embankment. Prior to the middle of the 19th century, road engineering in the west was mainly based on gravel paving, and compaction mainly relied on natural rolling of vehicles. It was not until the invention of the rock mill in 1858 that the development of gravel roads was promoted. Gradually the compaction work with horse-drawn rollers appeared. This is the earliest prototype of rollers. In 1860, steam rollers appeared in France, which further promoted and improved the construction technology and quality of gravel roads, and accelerated the progress. In the early 20th century, the world recognized the gravel pavement as the best pavement at that time and spread it all over the world. The concept of compaction gradually became known, and the road rollers also came out of various road construction sites. In the middle of the 19th century, the invention of the internal combustion engine Bring great vitality to the development of compaction equipment. The first internal combustion engine-powered roller was born in the early 20th century. Then came tire rollers, sheep-foot rollers and bare-wheel rollers were produced almost at the same time. People have studied the compaction effect of static rollers and thought that increasing the weight of the rollers can increase the line pressure of the rollers, thereby increasing the pressure. Real effect. Therefore, for a long time, people devoted themselves to the development of large-tonnage rollers. The largest tire roller weighed more than 200 tons. However, during this period, the changes of the rollers were mainly the improvement of physical power and appearance. ^[1]

As shown in table ^[1]

1. Every shift should check whether the fastening parts of each connecting part are loose, check the tire pressure, check whether the bearing is hot, and if there is a problem, it should be dealt with immediately. After the daily operation, the fuel tank should be filled with fuel to prevent water droplets from forming on the inner wall of the fuel tank. Before the daily operation, open the drain valve of the fuel tank to drain water. After the engine fuel is used up or the filter element is replaced, the air in the road must be exhausted. 2. Frequently check whether the hydraulic system oil tank needs to be filled with hydraulic oil, and whether there is oil leakage in each oil pipe joint. 3 Fill the lubricating parts with lubricating oil according to the requirements of the lubrication table. 4 Check and adjust the axial clearance of the roller frequently. After the roller has been working for half a year, the installation positions of the rollers should be changed to make the tire wear uniform. 5. When the roller is transported by itself, the tire pressure should be kept below 0.6 to 0.65Mpa, and the driving distance should not be too long. 6. The brake mechanism should be checked and maintained frequently. 7. If the roller is parked for a long time, the fuselage should be erected to reduce the pressure deformation of the tire. After being parked for a long time, you should check whether the lubricating oil of each part has deteriorated when you use it again. If it cannot be used, you should drain the waste oil and replace it with new oil. ^[1]

The low temperature makes it difficult to start the engine. The main reasons are the increased viscosity of the lubricating oil, the decline in the battery's ability to work, and poor fuel atomization. The viscosity of the engine oil increases as the temperature decreases, and the flow performance becomes worse. As a result, the engine lubrication conditions are deteriorated and the crankshaft's rotational resistance is increased. When the battery is at a low temperature, the viscosity of the electrolyte also increases, the permeability decreases, and the increase in internal resistance significantly reduces the battery capacity and terminal voltage, and even fails to discharge. The voltage drop makes the starter unable to obtain the required output power, and it is difficult to meet the requirements of the starting speed. Due to the low temperature, the crankshaft rotation speed of the engine is not high, the temperature of the intake pipe and the gas flow rate are low, and the atomization quality of the fuel is poor, which further increases the difficulty of starting the engine. Under low temperature conditions, various oils have high viscosity and poor fluidity, which makes the operation of the roller difficult and exacerbates the wear of the parts. The viscosity of the lubricating oil is large, and the power loss of oil stirring is increased during the operation of the mechanism, which reduces the engine power and reduces the efficiency of the transmission system, thereby reducing the driving ability of the roller walking and excitation mechanism. The poor fluidity of the lubricating oil adds difficulty to the lubrication of certain components and reduces the lubrication effect, thereby exacerbating the wear of the engine and transmission parts. The high viscosity of the working oil also increases the resistance of the pipeline, making the hydraulic steering difficult, the efficiency of the hydraulically driven brakes worsening, adding difficulties to driving, and adversely affecting safe driving. There are also widespread freezing hazards during construction in cold seasons, for example: freezing of the electrolyte of the battery will cause it to stop working; freezing of the cooling water of the water-cooled engine will freeze and crack the radiator and the cylinder block. ^[1]

With the continuous development of China's society and economy, the domestic demand for rollers has continued to increase, and foreign famous roller manufacturers have also increased their investment in the domestic market, which has caused a certain threat to the market share of Chinese enterprises. In 2012, China's roller exports Growth slowed. After years of development, the production and sales volume of China's road roller industry has increased year after year, and the industry has gradually entered a mature period. It has made a great leap in technology research and development and market expansion. As China's investment in infrastructure continues to increase, large-tonnage rollers will still be favored by construction units due to their high-efficiency compaction results, and their market situation will continue to improve. ^[1]