China's boom-type concrete pump truck started in the early 1980s, the initial is basically the introduction of spare parts assembly, or through the introduction of technology and trade combined with the introduction of technology and part of the production of parts combined mode of production. In the early 1980s, the total amount of domestic concrete pump truck was less than 200 units, and the boom concrete pump truck was even more a blank. During this period, some large concrete pouring projects in China basically relied on imported equipment. After nearly 20 years of hard work, our boom-type concrete pump truck has made considerable development, design level, manufacturing capacity has been greatly improved. According to statistics, at present, China's concrete pump manufacturer has reached more than 100, distributed throughout the country. However, due to the technical level of various manufacturers, production processes, production capacity, such as uneven, the product gap is also larger. At present, the strongest production capacity in China is the first tier represented by Sany Heavy Industry, Zoomlion, Xuzhou Heavy Industries and Futian Heavy Machinery. The second tier consists of Liaoning Hainuo, Hubei Construction Machinery, Anhui Xingma and Shanghai Hong Deli and other enterprises based, the two echelon of the production accounted for more than 90% of the industry. In recent years, China's boom-type concrete pump truck has experienced rapid development. Although its product stability and technology are not as good as abroad, its products have obvious competitive advantages in terms of cost performance and after-sales service, The actual construction in the country. Among them, Zoomlion, Sany Heavy Industry in the arm-type concrete pump truck research and development walk in front of peers. Zoomlion formulated the "concrete pump truck" standard, but also developed a remote maintenance and positioning system for pump trucks. Sany Heavy Industry pump truck, pump pumping capacity, or stability, reliability, etc., can be comparable with well-known foreign brands, the pump machinery products have been sold to the Middle East, North Africa and South Asia and other places. As can be seen from the 123 patents issued by the State Patent Bureau, the patents obtained by the domestic pumping machinery mainly include the pumps, pump gates and pump control, hydraulic and electrical appliances, etc. This shows that the domestic enterprises' Research more attention, this is also the field of domestic pumping machinery is relatively weak. Followed by the pump spare parts and jib, the number of patents in the past 20 years, only more than 100, which also contains foreign companies to apply for a patent, which shows that China's boom pump business unit research and development investment is not enough. Domestic boom-type concrete pump truck because of the late start, the past two years, domestic enterprises have stepped up the introduction of technology and quality control, design and development with independent intellectual property rights of boom-type concrete pump truck, technological innovation as a domestic boom-type concrete Booster pump development. The major components of the technological development trend also represents the development of the domestic boom truck concrete pump truck development. The chassis engine powers the work and driving of boom-type concrete pump trucks. Therefore, the performance of the chassis engine directly affects the performance of boom-type concrete pump truck. Currently domestic boom-type concrete pump truck commonly used Volvo, Mercedes-Benz, Isuzu chassis, 2005 has made use of domestic chassis boom concrete pump truck to the market. With the increasingly mature domestic boom truck pump market, vehicle profit margins continue to decline, in order to meet the different needs of users, using domestic chassis and imported chassis boom concrete pump truck will own a place in the market . Domestic boom-type concrete pump chassis almost all imported chassis. Isuzu chassis technology which is mature, perfect service in the country, the price is relatively cheap. At present, the engine used in the domestic boom-type concrete pump truck chassis meets the Euro â…¡ or above standards, to meet the environmental requirements of large and medium-sized cities. Boom concrete pump truck operation is often limited by the upper space, requiring the top of the boom when the boom is the lowest, 4-fold below the boom commonly used single folding type R or Z-type. More than 5 knuckles of jib due to space constraints, the general use of folding type RZ to achieve the boom to expand, Shoulong, applicability, mobility and flexibility to enhance, especially in the tunnel and indoor work construction, the efficiency is significantly improved. The length of the first domestic boom to 37 meters mostly in the past two years have become increasingly longer trend in the next few years, as the demand continues to grow, there will be a longer boom concrete pump truck to the market. Boom concrete pump truck leg operations are often subject to space constraints, especially large jib concrete pump truck. Therefore, all manufacturers have to combine their own experience to find solutions. As a result, arm-type concrete pump truck leg design presents a personalized, diverse features. Currently on the market with dual swing and X-shaped legs mostly. Longer fabric boom and more flexible outrigger structure are the major trends in the development of boom-type concrete pump trucks. Various types of folding are used in combination to make the boom design more flexible and lighter. The form of legs is also more and more flexible, the extensive use of unilateral legs, so that the boom concrete pump truck to adapt to different site conditions. Higher pressure, greater transmission capacity will become the future development trend of pumping system of the domestic boom concrete pump truck center. In the early stage of the design of the domestic boom concrete pump truck, the concrete delivery bore diameter was about 200 millimeters and the output displacement was mostly concentrated below 100 cubic meters / hour. Since 2004, the concrete delivery cylinder with the bore diameter of 200 mm has left the pump truck product. Currently, the market's most common delivery bore is 230 mm and the output displacement is 120 cu / hr. With the arm boom concrete pump arm boom is getting higher and higher, the model is getting bigger and bigger, the cylinder diameter of the cylinder is also getting bigger and bigger, the largest domestic use of cylinder diameter has reached 260 mm, the concrete output displacement is greater, However, according to the overall configuration of the complete machine, due to the limitation of the overall height and the width of the frame, the concrete cylinder with larger bore diameter is greatly restricted in the application of the arm-type concrete pump truck. At the same time, the larger the cylinder diameter of the concrete delivery cylinder, the greater the output displacement, the greater the required chassis engine power will be, and the greater the vibration displacement of the boom will be when the whole machine is working in large displacement. Therefore, the large bore boom truck concrete pump to replace the common bore of 230 mm bore, but also do a lot of work, go a long way. Due to the higher and higher requirements of the progress of the project, more and more projects of pumping displacement of 80-120 cubic meters / hour are required now. Large displacement will become the development direction of boom-type concrete pump trucks in the future.
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