GB/T 50551-2018 in English

Background of Standard Revision and Technological Evolution

This standard was revised in accordance with the requirements of the Ministry of Housing and Urban-Rural Development's Construction Standard Letter [2015] No. 274, and was led by the China Metallurgical Construction Association and participated in by six units including the 17th Metallurgical Group. Compared with the previous version, the main enhancements are:

Key points for installation of core equipment

1. Powerful mixer

Horizontal mixerThe horizontality of the bearing seat is ≤0.1/1000, and the axial play clearance of the main shaft must meet the design value. When using the mortar installation method, the concrete strength must reach 75% of the foundation design value before fine adjustment.

2. Disc ball making machine

Special processes need to be formulated for the welding of loose parts, and the lining rubber bonding needs to be constructed according to special processes. Key indicators:

• Disk flatness ≤10mm
• Relative difference in edge height ≤5mm
• Scraper verticality ≤0.5mm/m

Quality acceptance system

Innovative technical terms

1. The Chain grate conveyor-rotary kiln system adopts laser centering technology, and the radial runout of the cylinder is ≤12mm

2. Installation requirements of the new flexible transmission device:

• The tension ring bolts need to be degreased
• When multiple sets of tension rings are tightened synchronously, the spacing difference is ≤0.05mm