China started to introduce Japanese technology to mass production of concrete pump trucks in 1982, and after more than 20 years' development, although the design level and manufacturing capacity of concrete pumps in our country have been greatly improved. However, in the three most important components of the pump truck - chassis, pumps and boom, the domestic customers or manufacturers are still more inclined to adopt imported products. Especially in the choice of pump chassis, it is particularly popular imported products. Dual choice for users and pump manufacturers When choosing a pump chassis, there are four important factors to consider in addition to the price: the first is the brand. The competition in the field of construction is fierce, and most pump truck users will think that brands with well-known brands will give their business a competitive advantage; the reliability of the second vehicle. Due to the high working intensity of the pump truck, the requirements for durability and intactness of the chassis are very high. Once the chassis failure, it not only brings about maintenance costs, but also the economic benefits of the users will be seriously affected. Thirdly, Is the service. Pumps special service environment requirements for after-sales service is very high, timely and even after-sales service will decide whether the user contract construction contract can be successfully completed. The Beijing Century Panorama Machinery Leasing Co., Ltd. is well aware of this. As one of the national projects, one of the Olympic Bird Nest Engineering Construction Company, its engineering pump not only related to the company's reputation, but also shouldered the serious task of building a smooth national project. This time, the company purchased six Volvo truck brave "stand" out. Two on-site monitoring are insisted to the next day at 2 am, while the Volvo truck service department is also waiting in seconds on the construction site. This serious and responsible work attitude, efficient and stable quality of work has won the Olympic project team highly appreciated, but also has been highly recognized engineering headquarters. The fourth is fuel economy. Today, fuel prices continue to rise, pump fuel consumption is also a factor customers have to consider. The level of fuel consumption will also have a certain impact on the sales of vehicles. For pump manufacturers, the same is also facing the choice of chassis. With the development of the market, the pump truck manufacturing is diversified. The length of the boom is longer and longer and the carrying capacity is also larger and larger. Therefore, when selecting the matching chassis, the pump truck manufacturers also put forward some requirements accordingly: First, the engine power output and design requirements of the coat matching. Pump truck top designers according to the design of the outlet pressure on the load, the torque required to select the appropriate engine power. If the two do not match, there will be problems such as speeding down the pump in the actual work; second, according to different design weight, different boom length, choose the correct modified chassis. Pump design not only to consider the working conditions of its coat but also consider the safety of its road driving, so according to the distribution of load and national laws and regulations to choose the matching chassis form. Such as: usually arm length 27m below the pump used 2-axis chassis, arm length 27m ~ 37m pump used 3-axis chassis, arm length 42m ~ 47m pump used 4-axis chassis, arm length 52m above Use 5-axis or 6-axis chassis; third, according to chassis modification instructions provided by the manufacturer to implement the vehicle modification work. For example, VOLVO Trucks can provide each refitting company with a CD-ROM and a professional website to support the retrofit. Volvo coat support engineers to provide technical support for the modification of the pump can be modified to help enterprises develop appropriate modification programs. Constantly introducing products that meet the needs of the market is based on the dual choices of users and pump truck manufacturers. Imported truck chassis has always been very popular, of course, which is also inseparable from the efforts of imported brands. As one of the representative companies importing heavy trucks from Europe and the United States, Volvo has been seeking to provide users with more suitable products in pump chassis. Since 2001, Volvo has adopted FM7, FM12 chassis began to cooperate with China's pump truck business, the product on the market, it has been recognized by the majority of users. Today, Volvo and Zoomlion in Changsha, Sany Heavy Industry, XCMG heavy machinery companies and other well-known domestic enterprises are carrying out pump modification business cooperation. Rough estimate, at present in the Chinese market, Volvo pump truck owned as many as 3,000, and mostly FM12, which also proved that the majority of pump users and the growing pump truck market recognition of Volvo. The FM400 / 440 series trucks are the latest models produced by Volvo Trucks. Based on the experience of the FM12 series models running in concrete pump trucks in China, Volvo Trucks designed the FM400 / 440 series in a targeted manner to make it More suitable for China's actual operating environment. Volvo pump chassis engine via D7, D12C, D12D developed to D13, power from 340 horsepower, 380 hp to 400 hp, 440 hp or 480 hp, 520 hp. Chassis drive form from the initial 6 × 4 developed into today's 6 × 4, 8 × 4, 10 × 4 series. From the environmental point of view, Volvo engines already have the power to upgrade from the European III standard to the European IV and even the European V standard. As the main use of pump truck in situ construction status, so the dynamic performance of the chassis is very important. Therefore, low fuel consumption, high power, environmentally-friendly pump will become the first choice of the majority of pump customers.