Processing and manufacturing of main parts
Large-scale high-concentration disc mills lack relevant standards and technical specifications. For the processing and manufacturing of major components, refer to the relevant technical specifications of large-scale steam turbines.
1) Turntable: large forgings, quenching and tempering, balanced quality grade G2.5, strictly control the end face runout of the plane where the grinding disc is installed, and the runout tolerance is controlled within 0.05mm.
2) Spindle: quenching and tempering after forging, installation of turntables, radial bearings, thrust rings, couplings at the level of coaxiality 5 level shape tolerance.
3) Thrust ring: quenched and tempered after forging, balanced quality grade G2.5, strictly control the runout of the end face of the plane where the grinding disc is installed, and the runout tolerance is controlled within 0.02mm
4) The thrust bearing seat coupling ring is used as a hydraulic cylinder. The inner surface is ground. The cylindricality tolerance is strictly controlled within 0.04mm.
1) After the thrust ring is installed on the main shaft, check the runout of both ends of the thrust ring. The runout amount is controlled within 0.025mm.
2) The clearance between the inner ring of the bearing and the roller should be 0.08 ～ 0.015mm.
3) Install the turntable
The rotary disc is connected to the taper surface of the main shaft, painted and assembled, and the contact rate is not less than 80%; the pressure of the hydraulic pump for the expanded connection is controlled to 140 ~ 170MPa.
The pressure of the hydraulic bolt tensioner pushing the turntable is maintained at 20MPa. After being installed in place, the hydraulic bolt tensioner maintains a pressure of at least 8h.
4) Control the parallelism of the surface of the turntable and the end face of the grinding shell
Adjust the radial runout of the turntable and the end face of the mill housing to ensure that the end face of the mill housing is parallel to the surface of the turntable. Fix the beat meter on the housing of the mill, bring the contact bar close to the surface of the turntable, and slowly rotate the turntable. The maximum allowable beat amount is 0.075mm.
Fix the beating instrument on the turntable, place the contact rod close to the end face of the mill housing, slowly rotate the turntable, and measure the readings of the four points where the mill housing is connected to the main frame. The parallelism between the disk and the static disk is within 0.1mm.
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