For the calculation of a conveyor chain, the load, the speed, the working conditions and the length of the chain are decisive. The actual chain work load "F" is initially calculated using the following formulas.
With the calculated value, the corresponding chain is chosen from the "Selection diagram for conveyor chains": It is very important to take into account the appropriate safety factor "gamma". In general, it is of the order of 6 to 7. In extreme cases and admitting a reduction in its working life, the nearest lower chain can be used. However, it is recommended in all cases to check the calculation of the chosen chain with respect to the compression of the articulation surface. The permissible articulation surface compression values are shown in the diagram.
All the conveyor chains are built on the so-called base chains, made up of shafts, bushings and meshes and can be completed by means of hollow shafts, rollers, wings, drag pivots and other elements and accessories for the most diverse applications. The breaking load of the chain does not change except in the case of the use of hollow shafts.
Tabla de densidades y coeficiente de rozamiento del producto
| Tipo de producto | Densidad "γF" ( t/m3) | Coeficiente de rozamiento "C" sobre acero |
|---|---|---|
| Cenizas | 0,50 | 0,85 |
| Minerales | 2,25 | 1,20 |
| Cereales | 0,60 | 0,55 |
| Virutas de madera | 0,25 | 0,80 |
| Grava | 1,75 | 1,00 |
| Carbón | 0,80 | 0,90 |
| Coque | 0,45 | 1,00 |
| Arcilla | 1,25 | 0,75 |
| Arena | 1,55 | 0,80 |
| Piedras | 1,80 | 0,65 |
| Turba | 0,35 | 0,70 |
| Cemento | 1,15 | 0,65 |
Todos los valores son orientativos
Para valores exactos ver hoja 1 de DIN 1055 o manueles técnicos.
Tabla de coeficientes de rozamiento
| Rozamiento deslizante | μ |
|---|---|
| Cadena seca | 0,36 |
| Cadeba engrasada | 0.27 |
| Rozamiento rodante | μ |
|---|---|
| Palier de rodamiento | |
| Lubrificación favorable | 0,005 |
| Lubrificación normal | 0,015 |
| Lubrificación desfavorable | 0,03 |
| Palier de deslizamiento | |
| Lubrificación con aceite | 0,15 |
| Lubrificación con grasa | 0,2 |
El coeficiente de rozamiento "C" sobre madera es aprox. un 15% más elevado
Ver tabla de conceptos, abreviaturas y dimensiones
| Conceptos | Abreviaturas | Dimensiones |
|---|---|---|
| Carga de trabajo de la cadena | F | [N] |
| Carga de trabajo del transportador | FF | [N] |
| Distancia entre ejes | A1 | [m] |
| Peso de la cadena | q | [kg/m] |
| Peso de las cadenas del transportador | qF | [kg/m] |
| Peso del material transportado | Q | [kg/m] |
| Capacidad de transporte (continuo) | QL | [t/h] |
| Capacidad de transporte (intermitente) | QU | [t/h] |
| Velocidad de la cadena | v | [m/s] |
| Coeficiente de rozamiento | μ | [-] |
| Coeficiente de rozamiento del producto | C | [-] |
| Densidad del producto transportado | γF | [t/m3] |
| Grado de carga | β1,β2 | [-] |
| Ancho del canal transportador | BF | [m] |
| Altura del canal transportador | HF | [m] |
| Capacidad de cada congilión | I | [m3] |
| Distancia entre congilones | A2 | [m] |
| Inclinación | α | [º] |