Influence of circular vibrating screen feeder on sand production line
Sand making machine is the main equipment for machine-made sand production. Circular vibrating screen and feeder are very important equipment in the sand making production line. Since the materials in the sand making process are mainly broken from rocks, it is inevitable in the production process. It will bring in some scrap magazines, etc., which will cause the sand and gravel produced by the sand making machine to have a length of more than 0.075mm. The particles contain some mud powder, and the presence of mud powder will hinder the normal hydration of the cement or mix with the components in the cement. Carry out a chemical reaction.
These negative effects can lead to a decrease in concrete strength, an increase in shrinkage, and a decrease in concrete durability. The production efficiency of the circular vibrating screen and vibrating feeder determines the production efficiency of the sand making machine. According to the relevant national standard GB/T14684-2001 (Sand for Construction”, it is stipulated that machine-made sand needs to use the methylene blue method to detect the mud powder content in machine-made sand, and the MB value of machine-made sand produced by the sand making machine is required to be less than 1.4.
Therefore, the content of mud powder in machine-made sand should be strictly controlled. In the actual production process of machine-made sand, specific measures are mainly adopted to effectively screen out part of the soil in the block stones through the steel plate strip screen structure at the bottom of the circular vibrating screen feeder to reduce the content of powder in the machine-made sand.
As the grade of surrounding rock in the tunnel changes, the parent rock used for sand and gravel production also changes. By analyzing and comparing the MB value of machine-made sand before and after the adjustment of the strip screen, it can be seen that with the width of the strip screen If it becomes larger, the MB value of machine-made sand is effectively reduced. Under the condition of the same vibration frequency of the feeder, the width of the strip screen can be controlled at 0-10 mills when the tunnel is surrounded by Ⅲ surrounding rock, and when the Ⅳ surrounding rock in the tunnel is above or above , The width of the bar screen is controlled at 50-80mm.
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