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Vibrating screen design, width and length of the screen



Selection of width and length of the screen surface The width and length of the screen surface is an important process parameter for the screen. Generally speaking, the width of the sieve surface determines the processing capacity of the screening machine. The length of the sieve surface determines the screening efficiency of the screening machine. Therefore, the width and length of the sieve surface are correctly selected to improve the production capacity and screening of the vibrating screen machine. Efficiency is very important.

The width of the screen surface is not only affected by the processing capacity of the screen, but also by the structural strength of the screen. The larger the width, the more certain the size of the screening machine is. The more problems that need to be solved in the structural strength of the screening machine, the more difficult it is, so the width of the screen surface cannot be arbitrarily increased.



The length of the screen surface affects the residence time of the screen material on the screen surface. The screening test shows that the screening time is slightly increased, and there are many particles smaller than the mesh, and a large amount of the sieve passes through the sieve surface, so the screening efficiency increases rapidly. The test results show that the longer the sieve surface, the longer the material stays on the sieve surface, and the higher the screening efficiency. However, as the sieving time increases, the number of sieving particles on the sieve surface becomes less and less, leaving most of the "diffuse granules", that is, the granules whose size size is close to the mesh size. The screening of these difficult-to-screen particles takes a long time, and the increase in screening efficiency is slower and slower. Therefore, the length of the screen surface is only within a certain range, which is effective for improving the screening efficiency, and the length of the screen surface cannot be excessively lengthened, otherwise the structure of the screen machine may be cumbersome and the expected effect is not achieved.

In general, the ratio of the length of the screen to the width is 2 to 3. For the screening of coarse-grained materials, the length of the sieve surface is 3.5~4m; for the screening of medium-fine-grain grade materials, the length of the sieve surface is 5~6m; for the dewatering and de-screening of materials, the length of the sieve surface is 6 ~7m; the pre-screened sieve surface can be shorter, and the final sieved screen surface should be longer.

How to properly select and calculate the transmission power of the screening motor is of great significance. When the transmission power is properly selected, the normal operation of the screening machine can be guaranteed.

Bearing selection According to the working characteristics of the vibrating screen, a single-row radial cylindrical roller bearing with large clearance should be used.

Design and calculation of the spring end structure is selected to be tight at the end, smoothed, and the support ring is 1 turn; the material of the spring is C-class carbon spring steel 65Mn, and the number of vibrations of the spring is n=600r/min.

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