5　Installation for Proportioning Equipment and Mixer

5.1　Constant-weight Feeder

5.1.1　Adjustment and calibration of belt conveyor scale of constant feeder shall meet the design technical document.

5.1.2　During installation of constant feeder，the trough shall be installed before disk feeder.The position of discharging outlet of trough shall be adjusted and fixed with the trough after alignment of disk feeder.

5.1.3　The pressure sensor between upper support seat and foundation shall be substituted by a temporary steel block，and shall not be installed until finishing installation and positioning of trough，and before connection to the disk feeder.

5.1.4　Raw material trough shall be installed according to the following requirements:

1　To adjust the longitudinal and transversal centerline，checking by means of putting up piano wire/thread and taking measurement with a tape/ruler with tolerance of 5.0mm；

2　To adjust the elevation of flange at the discharging outlet，checking with the level，straight steel ruler，with tolerance of±5.0mm；

3　To adjust the gap between trough and top surface of disk，checking with steel ruler with tolerance of±5.0mm；

4　To check the circumferential malposition of bolt hole centerline of flange with tolerance of 5.0mm.

5.1.5　Installation of disk feeder shall meet the following requirements:

1　To adjust the elevation of top surface of disk with level and steel ruler with tolerance of±3.0mm；

2　To adjust the levelness of disk top surface and checking with a bubble level，with tolerance of 0.5/1000；

3　To adjust the longitudinal and transversal centerline，checking by means of putting up piano wire/thread and taking measurement with tape/ruler，with tolerance of 2.0mm；

4　To adjust gap between bottom surface of disk inner sleeve and top surface of disk，checking with steel ruler with tolerance of±5.0mm；

5　The driving device shall meet the current national standard GB 50231 General Code for Construction and Acceptance of Mechanical Equipment Installation Engineering.

5.1.6　The installation of belt conveyor scale shall meet the following requirements:

1　The rack elevation shall be adjusted，and checked by level and steel ruler，with tolerance of±3.0mm；

2　The longitudinal and transversal center line of column and beam of rack shall be adjusted，checking by means of putting up piano wire/thread and taking measurement with tape/ruler，with tolerance of 3.0mm；

3　The verticality of rack shall be adjusted，and checked by wire pedant and steel ruler，with tolerance of 1.0/1000；

4　The distance between the scale and centerline of disk feeder shall be adjusted，and checked by steel tape with tolerance of±3.0mm；

5　The elevation of the scale shall be adjusted，and check by level and steel ruler with tolerance of±2.0mm；

6　The weighing roller elevation shall be adjusted，and checked by leve and steel ruler with tolerance of+2mm，with top surface a little higher than the idler roller（see Figure 5.1.6）；

7　The parallelism（a-a′、b-b′）（see Figure 5.1.6）between weighing roller and fixed idler roller shall be adjusted，and checked by inner micrometer，with tolerance of 1.0mm.