Blast furnace blower sliding bearing assembly

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Blast furnace fan as the heart of the blast furnace equipment, high technical requirements in the field assembly. Fan site construction, sliding bearing assembly if not handled properly, the light will cause the unit vibration will bring serious bush-burni ng, destruction of the rotor balancing.
Plain bearings assembly requirements
Between the bearing housing and the equipment chassis positioning pins connecting bolts must be tight to make it uniform contact, the contact area should be 75%, stable fixation, the operation of the equipment does not allow the bearing seat relative displacement. Equipment alignment, marked fixed locating pin.
Special emphasis is steel locating pins of the motor bearing housing should be replaced with rigid nylon insulation dowel pins to prevent burns bearing alloy surface axis current equipment operation.
Consider the factors of thermal expansion, the fan intake end plus single pad double nut pressed, the outlet end of the nut is fastened to the bearing and equipment base only 0.05 ~ 0.10mm gap until the single pad.
Bearing and bearing housing the concentricity assembly requirements
Burrs and rust of the lower shaft Wawa back and the mating surface of the bearing seat and polish with a scraper or Whetstone. But also by coloring method to check the contact condition (when the operation of the device, the pad diameter is too small, the pad will be in the bearing bracket fibrillation; pad diameter is too large, and forcibly pushed, will cause the pad to produce deformation).
Fan tile back generally cylindrical surface under the tile body three adjustment pad on a tile body adjust pad. , When necessary, by adjusting the adjusting washer of the tile back to ensure uniform contact of the fixed liner, the contact area of not less than 75%.ball thrust bearing
Motor watts and growth of the cylindrical surface, without adjustment pad rely on machined to ensure concentricity within 0.10mm, the site will be able to watts lining scraping or in need of replacement spare parts.
The tile back if it is spherical, the contact surface when the on-site inspection s hould not be less than 60%.
Rabbet bearing bush with very tight bearing to prevent axial movement within the bearing housing.
Upper and lower bearing merged into the bearing seat, loaded locating pin, carved face at not allowing leaky and the inner circle of the wrong mouth, solid and reliable anti-rotation pin.
The bush diameter of gap measurement methods
The bearing diameter clearance measurement of lead wire, lift shaft Law, the diameter Comparative Law and the feeler gauge method.
The pad side of the gap measuring method generally used the feeler method, feeler stuffed in the gap is not less than the length of journal diameter of 1/4.
Round tile diameter clearance to take ~ 2 ‰ d, a backlash to take to 1 ‰ of d. Oval-watt diameter clearance to take (1 ~ 1.5) ‰ d, backlash take (2) ‰ d. Fan shaft diameter d = 175mm diameter gap of 0.27mm, 0.40mm backlash.
Measurement of the fan rotor thrust gap
General pu sh axis measurement of the wind turbine rotor thrust gap. The displacement of the fan shaft thrust clearance to take (1.8 ~ 3) ‰ d, d = 175mm, the thrust clearance of 0.30 to 0.50 mm.
Long bearing chock interference
Cylindrical watt back bearing must be 0.02 ~ 0.06mm amount of interference; the spherical bush back 0.02 ~ 0.04mm amount of interference. Can measure the amount of interference of lead wire. The bearing gland interference measurement, gaskets take the copper sheet of 0.2 ~ 0.4mm, and the lead wire diameter larger than the gasket thickness of 0.2 ~ 0.3mm Good.
The bush lining of scraping
Hongdan check journal in watts lining inside contact. For round tile and elliptical watts, a bottom contact angle within 60 °, the entire axial length and journalled between 1cm2 inner contact point of at least 1 to 2, but also to the side clearance to meet the requirements. The speed increaser HS thrust face four the oil wedge watts in principle, to scraping.roll bearings
Rough scraping points: scraper was a positive rake angle; the fine scrape points: scraper was smaller negative rake angle; fine scraping Important: scraper was larger negative rake angle.
Fine scraping scratched points: the knife track and centerline hole into 45 °, and each pass of the knife track should be perpendicular to cross, so that the RESEARCH point clearly not a strip fine scraping blade and the bore surface of the contact position and the scraping pressure, and should be controlled, prevent a tear marks.