1.Have and can regulate elasticity make roottension balanced device of line at will . 2.Free necessary length parks and establishes the device . Guarantee and requires it definitely quantity is accurate. 3.Shelf adopt and bring transmission in ster by glue , person who make platform tyrn round stably , have noise . 4.Pass record load and adopt pneumatic to control , stability high platform of making etc .,it is more convenienttooperate. 5.Can be chosen and offered by the customer by a size to select for use, or according to the customer it is a design to need taking the place of . 6.Line shelf-figure number fans of 60-72,84 for choosin.