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Stress Analysis of Belt Conveyor Worm Surface

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The Ultrafine Mill is a transmitting mechanical to drive materials by friction in a continuous manner, it can form a delivery processes between the feed point and the discharge point; if matching with corresponding technological process, they can be a rhythmic flow transport line.

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The worm is a key component of the belt conveyor; its stress force determines the quality of work performance and length of service life. So, it is necessary to analyze the stress force of the worm.When we take the stress analysis of worm drive, we must first determine the direction of worm and worm gear. Worm is initiative, so it simply needs according to the steering of the worm and the helical direction of the line to determine the direction of worm wheel rotation, the method as follows: If worm is right type, we can express the worm direction with the four fingers bending direction of right hand; the opposite direction indicates the tangent velocity direction of worm gear node so as to determine the turning of the worm gear.The stress distribution of worm drive force is similar to that of helical cylindrical gear, when the worm is active pieces, the normal force working on tooth profile surface in bite aggregate node can be decomposed into three mutually perpendicular force components: tangential force, axis force and radial force. Tangential force and axial force are same in size and opposite on direction; the two radial forces direct to respective axis; the tangential forces of axial force and the worm wheel are same and point to the contrary directions.Then, we can take analysis to worm shaft strength and calculate the calculated stress axis to verify the most dangerous section of the shaft and check whether it meets the strength requirements.

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