Concrete pump truck chassis mostly by the rotary base, legs, swing cylinder, telescopic cylinder composition. As the main force component of concrete pump truck, most of its chassis structure is designed into a box-shaped structure, which also has both internal tank and water tank, its design is reasonable or not, directly affect the reliability of concrete pump, machine stability Sex and the whole weight. In BAUMA CHINA2004 International Expo, many internationally renowned domestic and foreign enterprises have demonstrated their own new products or high-quality products, but also shows the chassis design and manufacturing level and style. With the rapid development of domestic construction machinery, the gap between the design and manufacturing technology of the domestic concrete pump chassis and the advanced foreign countries has become smaller and smaller. At the same time, the domestic manufacturers in the chassis structure technology and design also made considerable progress in the study, combined with many years of structural design and manufacture of pump parts work experience and many times to participate in large-scale exhibition experience, talk about China The current design and manufacture of concrete pump chassis technology, as well as with the foreign advanced level of the gap faced. First, the characteristics of concrete pump chassis structure and the main connection. Concrete pump truck chassis structure is mainly composed of rotary base and outriggers, rotary base mainly as a get-off chassis, take on the work of the boom weight and vibration; leg role is to ensure the safety of concrete pump truck at work Sexual and stability. Since concrete pump trucks do not have the same counterweight as a crane, a large overturning moment is generated when the pump truck is extended horizontally. These overturning moments are mainly balanced by the reaction force of the outriggers. Therefore, Outriggers should have adequate structural dimensions, enough support area. At the same time turn the base and legs also have sufficient strength and fatigue resistance. Chassis structure in accordance with the support of the leg extension is divided into: swing-type front and rear legs, telescopic front and rear legs, the former telescopic swing leg. Front and rear oscillating legs in the form of the chassis structure, legs open around the pivot base pivot point to complete the swing, the work of good stability, simple structure, but the pump truck must have enough space on both sides , The site has been subject to certain restrictions. Due to the limitation of vehicle's overall dimensions and the stability of the whole vehicle, most of the concrete pump manufacturers at home and abroad adopt such structure. Front and rear retractable legs, also known as XH legs, means that the legs horizontally extend and retract within the box-shaped frame of the swivel base. The legs on the left and right sides of the truck can cross in an X-shape or extend in parallel. Due to the width and width of the pump truck, the structure size and extension length of the leg are greatly restricted, the manufacturing precision of the box frame of the rotary base is relatively high, and the weight of the entire chassis structure is also relatively heavy, And the need to use built-in fuel tank, disassembly and maintenance difficulties, so the level of 37 meters above the series have few manufacturers have adopted. Only in the early stages of the development of pump truck used by most manufacturers, but because of its more flexible work space, there are still manufacturers in the use of this structure. Such as Italy CIFA 37 m pump truck, MEBC037 m pump truck. The feature of the front telescopic swinging leg structure is that the telescopic supporting leg is connected to the front end of the rotating base and the swinging leg is connected to the rear. Due to the advantages of the former two structures, the underframe structure of the utility model has the advantages of reduced weight, The advantages of a narrow site construction, more and more manufacturers are used. In 2004, Xugong Heavy Industries was the first company in China to launch HB40, a former telescopic swinging leg structure pump. Its foreign manufacturers mainly include the following series of 42 m or less in Germany PM Company and the series of all-40 m and below in Korea. Second, concrete pump chassis design and manufacture of the difficulties and priorities. Swing base as the chassis structure of the main connection structure, because of the complexity of the structure, that is, to ensure that the work of the dynamic strength and rigidity, but also to make the weld with the ability to withstand vibration, so how to effectively calculate the correct, come to the whole Rotating the base of the stress distribution is the design of the difficulties. Xugong Heavy vigorously carry out the study of finite element, the calculation of the rotary base has been successfully explored and made valuable design experience. At the same time, the interior of the rotary base is mostly designed as a fuel tank and a water tank. How to avoid the occurrence of delayed cracking in the welding area is a manufacturing difficulty; and effectively preventing the leakage of the weld joint is also a major manufacturing task. Magnetic particle inspection plus kerosene leakage detection method and its ultrasonic detection method are good detection methods. What kind of economic approach, the domestic manufacturers but also according to their own equipment for comparative analysis and finalized. Under normal circumstances, due to the connection of slewing ring and slewing reducer in the slewing area of ​​concrete pump truck chassis, in order to ensure good meshing characteristics of swivel reducer and swivel support, slewing parts are designed with greater rigidity. The design of this area All manufacturers have explored an effective solution, the widely used approach is to increase the overall rigidity of the thin ring plate reinforcement method and thick seat plate connection method.
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