Design And Experiment Of Double Horizontal Shaft Vibrating Mixer With The Capacity Of1m~3

With the rapid development of economy, China has become the largest producer ofcement concrete and the production number of mixer are leading the world.Among the mixers,double horizontal shaft mixer because of the advantages of compact structure、the highproductivity and reliability,has been the leading equipment for the production of cementconcrete.But due to the line speed of conventional double horizontal shaft mixer presentslinear distribution from the inner wall of the mixer to the mixing shaft, when the location iscloser to mixing shaft,the line speed there would be the lower. When the mixing speed is toolow, it will not only reduce the mixing quality and mixing efficiency, but also easily bring thephenomenons like enclasping shaft in the mixing shaft.In order to solve the above problems, beginning from the concept of concrete mixing andvibration mixing theory, basing on the common double horizontal shaft mixer with thecapacity of1m3in existence, combining with research achievements that our research grouphave gotten in the aspect of vibration mixing, we designed double horizontal shaft mixer withthe the capacity of1m3as industrial prototype in this thesis. A new design method was usedthat the conventional solid mixing shaft was replaced by hollow structure. Inner the hollowmixing shaft, there is a vibrating shaft which the eccentric bearing housing is installed on it.The mixing shaft is supported on the mixing drum body by the vibrating bearings that isinstalled in the eccentric bearing housing and located in sleeves which are connected the twoends of vibration shaft. The two ends of mixing drum body are set up with drive for mixingand vibrating separately, which drive the mixing device and vibrating device with rotarymotions in the way of relative independent. As the mixing device and vibration exciter areintegrated structure in this designing, so the mixing device could vibrate when it mixes.After finishing the design calculation for the key components and parts of industrialprototype, we carried out3D virtual assembly and simulation analysis on the industrialprototype by using3D design software and simulation software，and then we have finishedthe structural design and parameters optimization of double horizontal shaft mixer with thethe capacity of1m3as industrial prototype.After the trial-manufacture of the industrial prototype, we have carried out reliability test and basic performance test in industrial prototype, and also carried out better mixing time test,less cement tests and comparison tests with the same capacity of ordinary double horizontalshaft forced mixer. The results showed that: when the line speed of mixing of the designedindustrial prototype is1.6m/s, and the excitation frequency is29.4Hz, the better mixing timeis45s. When it is set up in the better mixing time, the concrete compressive strength whichthe concrete was produced by the way of double horizontal shaft vibration mixing hasincreased by40%than the concrete produced by the way of ordinary double horizontal shaftforced mixing with the same capacity. The homogeneity of the concrete is more when thevibration mixing is used and the industrial prototype can produces concrete with higherquality. When the amount of cement in mixing materials is reduced by15%, the compressivestrength of concrete can still meet the requirements, so the energy-saving effect of industrialprototype is obvious. When the vibration mixing is on, the average current value of mixingmotor is lower than the ordinary forced mixing is adapted and the current fluctuations isalso small,which presents that the work process of industrial prototype is more stable.