Abstract
Due to the shortage of natural sand from rivers and seas, artificial sand production from large stones or rocks is being increased. However, this sand manufacturing process is dangerous and causes several social problems such as a high level of unwanted vibrations or noises. This study investigates the vibration characteristics of sand and screen units in an artificial sand production plant whose operation is multiple with several actuators different exciting frequencies. As a first step, vibration levels are measured at the sand and screen unit positions using accelerometers in time and frequency domains. The measurement is carried out at two different conditions: activating only the sand unit and operating entire facilities such as a stone crusher. Vibration signals acquired from several locations of the sand and screen units of the plant are collected and analyzed from waveforms and spectrums of the signals. We identified that the vibration acceleration level of the screen unit is higher than that of the sand unit. In addition, it is found from the acceleration signals measured at the plant office and shipping control center (which are far away from the plant location) that the beating phenomenon arose due to close driving frequencies for several sand units. In this work, the vibration caused from the beating is significantly reduced by adjusting the driving frequencies for the sand units so that they are sufficiently scattered to avoid the beating.
Highlights
Natural sand has been formed through the normal erosion process of exposed rocks
The wet type vibration screen unit and sand unit are defined as a device for screening and washing the stones using the water, and it is transported from the barmac into fine sized sand
50 m away from the manufacturing plant, and the company office located m away from the plant site. These vibration signals are to be used as comparative values after resolving the vibration source problem of the screen and sand units during the normal operation of
Summary
Natural sand has been formed through the normal erosion process of exposed rocks. Sands of various configurations, different sizes, and different non-rock inclusions of organic material are lined on the beach or with rivers or lake shores. The rock (or stone) breaking and crushing process plays an important role in minimizing the particle size of stone or rock for various construction activities, such as building bridges or infrastructure They can be obtained in large quantities from artificial sand production plant facilities such as jaw crushers, vibration screen units and sand units. The fine sand is moved to a designated storage place the artificial sand production from crushed stones or rocks requires various types of equipment related to the full manufacturing processes These facilities are large and inevitably have a significant impact, generating a high level of vibration and noise. It is shown that unwanted vibrations are significantly reduced by the adjustment of driving frequencies of the sand units [23]
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