Reasons for failure of transmission drum brake
1 abnormal pressure;
2 brake block is damaged;
3 brake drum on both sides of the brake disc defect;
4 operating brake switch system failure;
5 transmission drum power transmission system is not timely power off;
6 belt friction brake loose or friction factor decreased.
Life and reliability of roller
The life of roller can be divided into theoretical life, calculation life and service life. Theoretical life is generally refers to the standard life of the bearing, provided by the bearing factory. The calculation of life is based on the theory of life on the basis of considering the working state of the bearing, roller parts manufacturing and installation errors, the roller bearing state and the deformation of the roller shaft and many other factors. The service life of the roller is relatively simple, which means the actual running time of the roller. The life of the bearing is usually regarded as the life of the roller, which is in line with the actual, because in the vast majority of cases the roller damage is due to the failure of the bearing.
The main factors that affect the life of the roller are: the type of roller bearing and the bearing capacity, the choice of the roller is correct, the working environment and lubrication conditions.
According to the national standard roller life of not less than 20 thousand h, a lot of factors that influence the index, is the first choice of bearing, most domestic manufacturers choose to use deep groove radial ball bearing, tapered roller bearing and foreign useful. The ball bearing life is calculated from life and life, life and life calculation of tapered roller bearing, general service life is 3 times the life, so why most manufacturers choose to use the deep groove ball bearing? Most people think of ball bearing has the following advantages: (1) the price is low tapered roller bearing; (2) the running resistance is relatively small; (3) allow processing error, roller bearing deformation has little effect on its life.
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