Research and development trend of small pump trucks in my country

The rapid development of the concrete industry and the leasing business of construction machinery, the expansion of construction scale and scope, and the development of the western region have promoted the development of construction machinery and related concrete conveying machinery, providing a broad market space for the market. my country's concrete pump truck body user is a joint-stock company and individual in developed coastal areas, the main qualified commercial concrete supplier with a production capacity of more than 30 cubic meters, a large-scale industrial building construction unit, all kinds of economic strength and construction machinery rental The company's operating scale, separation of original equipment management units, etc.; individuals are mainly individual mixing stations and individual machinery leasing departments in developed coastal areas.

At present, the number of domestic manufacturers of such products is increasing, and the product performance and quality are rapidly improving. With the development of commercial concrete, concrete pumping machinery has more complete specifications and higher grades, and the pump truck distributing arm is developing in a longer direction, from 37 meters in the past to the mainstream, and gradually transitioning to 42-45 meters, 47-56 Rice is also favored by the market. As the project progresses faster, so does the pumping displacement. In the past, the displacement of 60-80 cubic meters per hour accounted for about 60%, but now the displacement of 80-120 cubic meters per hour requires more and more projects. For example, the concrete pump used by the Hangzhou Bay Bridge is basically 120 cubic meters per hour. The fluidity requirements of small pump truck concrete pumps are getting higher and higher. The pump truck basically shows that the market has grown rapidly, with an increase of 95.56% compared with 2002, and the increase in 2003 is larger than that in 2002, exceeding 100%. In addition, the automotive water pump market is also gradually active, Sany, Chutian, Zoomlion, Hongdeli and other manufacturers have launched new products on the market. At present, the power of diesel engines is increasing. Not only do pump trucks and truck pumps require diesel power, but the proportion of single-trailer pumps is also gradually increasing. Hydraulic systems are moving towards integration. Generally, an open system and constant power control are used, especially for large-scale flow pumps. The open system has the advantages of low oil temperature, high reliability, and convenient maintenance. At the same time, breakthroughs have been made in full hydraulic control technology and computer control technology. For example, the full hydraulic commutation and computer closed-loop control technology of SANY products have been widely used. The pumping pressure is greatly increased. Before 1971, most of the concrete outlet pressure did not exceed 2.94MPa, and later increased to 5.88-8.38MPa, and now it has reached 22MPa, and there is a trend of further increase. At the same time, the pressure of the hydraulic system is also increasing, basically above 32MPa. Therefore, the conveying distance is also increasing, the maximum horizontal conveying distance is more than 2000 meters, and the maximum vertical pumping height can reach more than 500 meters. Improving the energy-saving and environmental performance of equipment is also a major trend. Air cooling has gradually replaced water cooling, and engine emission standards have been raised, most of which reach Ⅲ or Ⅱ European standards. More attention should be paid to the study of concrete pumpability. It is mainly used for the research of high-strength, large aggregate and tertiary concrete. Now the pumped concrete with lower slump is only 20 mm, and the particle size of larger aggregate can reach 80-120 mm.

In addition to the great development of equipment design and manufacturing, the use and maintenance of equipment have also been greatly developed. Most equipment users are more and more familiar with the mechanical principle, structure, operation and maintenance of concrete pumping. This makes the equipment used in the construction process play an increasingly important role. With the acceleration of China's economic construction, many large-scale construction projects have been launched, and the market demand for concrete machinery has surged. At the same time, the state has issued a ban on the use of on-site concrete mixing in urban areas, making products such as concrete pumps, pump trucks, concrete trucks and concrete batching plants popular. These favorable external conditions provide a broad space for the development of concrete pumping machinery. Seize the opportunity and work together to push China's concrete pumping machinery products and market to a new level.