7.5　Installation of Exchange Driving Structure

7.5.1　The exchange driving structure shall be installed after the installation of the heating gas pipeline and the exchange shutter is qualified.

7.5.2　The exchange driving structure is positioned on the wheel stand at the resistance wall，the installation elevation shall be determined according to the center elevations of the chain wheels，and the centers of the wheel stand chain wheels of the same system shall be consistent.

7.5.3　Before the installation of the exchange wrench，the on/off position of the exchange cock shall be checked by contrasting to the heating system diagram，and the allowable deviation of the wrench turning on and turning off the exchange cock at the full turning-on and full turning-off position shall be±2.0mm.

7.5.4　The bearing pulley of the thallium rod brace of the waste gas valve shall support the brace，the allowable deviation of the center line of the pulley shall be 3.0mm；and the allowable deviation of the elevation of the pulley shall be±5.0mm.

7.5.5　Before the installation of the wrench turning of and turning off the waste gas valve，the direction of wrench and the transmission state of fan-shaped wheel and air damper transmission lever shall be checked by contrasting to the heating system diagram and the action diagram of the exchange shutter，and the allowable deviation of the wrench at the full turning-on and full turning-off position shall be±3.0mm.

7.5.6　The allowable deviation of the stroke of the exchange transmission brace shall be±10.0mm.

7.5.7　The installation of the exchange driving structure shall be in compliance with the following requirements:

1　The center of the chain wheel base is adjusted，and allowable deviation shall be 3.0mm；

2　The elevation of the chain wheel base is adjusted，and allowable deviation shall be±5.0mm；

3　The center of the brace support is adjusted，and allowable deviation shall be 3.0mm；

4　The elevation of the brace support is adjusted，and allowable deviation shall be±5.0mm.