湖南省长沙建筑机械修造厂和常德建筑机械研究所于1973年10月共同设计制造了一台J5B-500型混凝土搅拌机。该机为双锥形自落移动式,反转出料。每次投入干料的额定容量为500升,搅拌出混凝土335升。每个搅拌周期为100秒左右,可供土建、道路、水利、桥梁等混凝土工程使用,也可供混凝土预制构件厂使用。它是我国混凝土搅拌机械的一种新产品(见图)。 In October 1973, the Hunan Changsha Construction Machinery Repair Factory and the Changde Construction Machinery Research Institute jointly designed and manufactured a J5B-500 concrete mixer. The machine is a double-cone self-dropping mobile type, reverse discharge. The rated capacity of each input of dry material is 500 liters and 335 liters of concrete are mixed. Each agitation cycle is about 100 seconds, which can be used for civil engineering, roads, water conservancy, bridges and other concrete projects, and can also be used by precast concrete building factories. It is a new product of concrete mixing machinery in China (see figure).