Conveyor belt of the chain, the driving key lies in the non-standard sprocket roller, which can disperse the weight of the object through various rollers to achieve the purpose of driving the overload product.Single motor and reducer combined, can be large load driven, stable, the structure is perfect.This model is transformed into step and iges general model download, please refer to!Also includes 3d original files, welcome to download!if you like,you can paypal for you to get this models or if you have any questions also you can email to me.