The arrival of the era of the development of road maintenance machinery

Since China's road maintenance machinery began to develop in a planned way since the late 1960s, the entire industry has basically formed scale. Although there is still a certain gap compared with developed industrial countries, most of the products needed for road maintenance projects can already be produced. At present, new models and new technologies for building and maintaining road machinery are emerging, and product development, production and sales are very prosperous and have entered a period of comprehensive development.

In recent years, the rapid development of China's high-grade highways, especially expressways, has promoted the development of high-level, high-performance, and large-scale specialized machinery for road-building machinery. Some well-established road-building machinery have gradually entered the international market, marking China's The technical level of the road maintenance machinery has leapt to a new level. However, it should be noted that there are few types of machinery used in high-grade highway construction in China's road-building and road maintenance machinery industry (such as high-grade highway construction asphalt concrete or cement concrete pavement pavers, large-scale mixture drying mixers, and high-performance multifunctional Maintenance machinery, etc. still need to be fully or largely imported. Poor support capabilities, backward manufacturing processes, low product integration levels, backward research and development methods, and imperfect testing methods are all outstanding issues. In view of this, according to the status quo of China's road maintenance machinery, we evaluate the technical level of building machinery products, and thus have a more scientific and practical understanding of our own product technology level. This is to catch up with the international advanced level and develop our country according to local conditions. It is very meaningful to build road machinery. In general, this evaluation mainly includes the following aspects.

At present, there is no uniform requirement for the reliability of the construction and maintenance of road machinery in China. Foreign construction machine products generally require no mechanical failure after continuous use from 1500h to 2000h after leaving the factory. According to the requirements of most manufacturers on mechanical reliability, the continuous use period of such machinery in China should be guaranteed to be in the 1000h ~ 1500h failure is not appropriate. The length of the trouble-free period is a basic measure of the merits of mechanical reliability. Reliability not only reflects the inherent quality of the machine itself, giving full play to the mechanical efficiency, but also an important standard for reflecting and measuring the technology and management level of the manufacturer. In recent years, from the point of view of the world machinery industry for road maintenance, there are not many new models available, and most manufacturers have made articles on improving the level of mechanical technology and reliability. According to recent statistical data, one of the world’s best manufacturers of construction machinery, the US (Caterpillar) company’s products use a lot of advanced technology than previous mechanical products, such as laser leveling, infrared detection, etc. The advanced nature and reliability are further improved. From the overall level of analysis, the continuous operation of the non-fault time has exceeded 2400h. However, the weight of similar machines in the same period has increased. The increased weight of this part is mostly used for strengthening the strength and stiffness of the weak parts of machinery. Their emphasis on mechanical reliability is evident.

Due to the harsh operating environment of the road-building machinery, the reliability of its work is more important than the technological advancement of the machinery itself. Of course, the advanced nature of technology can also be used to improve the reliability of machinery. One of the important tasks of engineering technicians and manufacturers is to find out their inner relationship and design the best arrangement. The level of self-control is a basic indicator that reflects the level of the machine's own technology. It refers to the level of automation technology used by the machine in the operation and work quality control that cannot be completed manually.

A typical example of the use of automatic control is the hydraulic technology that emerged in the 20th century. Due to the installation of the torque converter (coupler), the machine can automatically adjust its driving torque as operating resistance changes, and thus in the earth-moving machinery (representatives such as full hydraulic loaders and bulldozers) and military armored vehicles. Has been widely used. In the modern road-building machinery, the use of automatic control technology is also increasingly important, such as high-grade highways in the use of automatic leveling device in asphalt pavement (cement concrete) paving machine (the typical type of proportional - pulse and laser leveling Types, etc.), Mixing drum type drying blender, automatic material weighing and control device, automatic operation instrument for mechanical working process, etc. Their adoption has greatly improved the construction accuracy of mechanical operations, improved the construction efficiency and quality, and reduced the operating strength of operators. In recent years, the emergence of high-grade highways, especially highways, in China has no automatic control of corresponding equipment with high-precision detection and quality requirements, and is unable to meet construction quality requirements.