About the vibration frequency of cement brick machine

- Nov 17, 2020-

About the vibration frequency of cement brick machine

 

Regarding the vibration frequency of the cement brick machine, from the perspective of concrete vibration technology, if the frequency of forced vibration is close to the natural frequency of the concrete mixture particles, resonance will occur. At this time, the attenuation is small and the amplitude can be larger. The aggregate particle size of the block concrete mixture is 3-10mm, and the ideal vibration frequency is 100-125Hz, but it is not up to the cement brick machine, generally 46-47Hz in the United States; individual molding machines in Europe are as high as 66-67Hz . The main reason for this is to consider the life of the vibration system, the vibration frequency is too high, and the life of the bearing is short, so generally 44-50Hz can meet the requirements of block vibration molding. Vibration frequency conversion has a certain meaning from a theoretical point of view, but from the engineering practice point of view, especially for the vibration forming machine with large vibration power, it is of little significance, because the actual vibration forming time is only 1-2 seconds, in such a short time Different vibration frequencies are applied to the concrete mixture internally, and the compaction effect will not change significantly.   Someone suggested that the production of load-bearing blocks should use American model vibration models, and the production of pavement bricks should use European model Taiwan vibration models. In fact, European block construction also has a history of nearly a hundred years. The blocks used are mainly produced by Taiwan vibration forming machines. In addition, pavement bricks can also be produced using American model vibration forming machines. Judging from the current block buildings in my country, the requirements for the strength level of load-bearing blocks are not high. Generally, for 1-3 floors in villages and towns, the required blocks are MU5.0 and MU7.5; most cities have 6-story buildings. The blocks are MU7.5 and MU10.0; while the few high-rise reinforced block buildings in the city currently only have 15-18 floors, the 1-3 floors need MU20.0, the 4-8 floors need MU15.0, and the rest Each layer is MU10.0, and the amount of MU15.0 and MU20.0 blocks is not large. Therefore, MU5.0-MU10.0 blocks required for multi-storey residential buildings are the most widely used blocks. Generally, domestic or imported Taiwan vibration forming machines can meet the production requirements, and most of the blocks currently used in block construction in my country It is also produced by a Taiwan vibration forming machine. In fact, the real need to improve the strength of the block is not based on the molding machine. Regardless of whether the mold vibration or the Taiwan vibration molding machine, when producing blocks of different strength levels, different concrete ratios must be used to adjust the amount of cement. Due to the high vibration power of the current mold vibration forming machine and good vibration compaction effect, the mold vibration forming machine should be preferentially used in the production of MU15.0, MU20.0 and other blocks. The mold vibration forming machine is generally more expensive because the vibration excitation device is directly installed on the mold box, the structure of the mold box is more complicated, and the cost of the mold box is relatively high. When selecting a molding machine, it should be determined based on comprehensive research such as product requirements, production process plans and investment status.