For linear vibrating screens, the ejection angle can be between 40 and 60 degrees. Small ejection angles result in faster material processing speeds and larger processing volumes, while large ejection angles result in slower material processing speeds but higher screening efficiency and better process results. The amplitude and ejection angle tests can be conducted using visual indicators for amplitude and direction angles. The amplitude and direction angle tests are conducted under the condition of a constant vibration frequency, and the magnitude of the amplitude is indicated by the vibration intensity of the sieve. The purpose of amplitude testing is to verify whether the average amplitude of the four corners of the sieve meets the design requirements, whether the amplitude of the left and right feeding ends of the sieve is consistent with the amplitude of the left and right discharging ends, and whether the average amplitude of the feeding end is too different from that of the discharging end.
Due to errors in the design (especially in the calculation of the center of gravity) and manufacturing process of the vibrating screen, the amplitude of the four corners of the vibrating screen is not effectively equal. Generally, it is required that the difference in amplitude between the two points at the feeding end and the discharging end of the swing screen should not exceed 0.5mm; The correlation between the average amplitude of points A and B at the feeding end and the average amplitude of points at the discharging end should not exceed 1mm. In this way, the material will not deviate during the screening process, the screening frame will not twist, and the vibration intensity of each part of the screening frame will be close to the same, which is beneficial for the overall life of the screening frame. The vibration direction angle (ejection angle) affects the conveying speed of materials.
