Replacement method for vertical mill main speed reducer in cement raw material grinding system

Abstract

The invention discloses a replacement method for a vertical mill main speed reducer in a cement raw material grinding system. The replacement method is characterized by comprising the following steps: (1) jacking up a grinding roller in a mill, installing a protective sleeve, drawing a cross central line in the mill, and aligning the intersection with the central point of a millstone; (2) marking longitudinal and transverse parting midpoints of the speed reducer on a foundation slab, and measuring a sealing gap between the speed reducer and a bottom plate of a material scraping bin, with 8 points on the uniform side (b);( / b) (3) removing attachment bolts for the millstone and the speed reducer; (4) uniformly jacking up the millstone by using three 200-ton hydraulic jacks; and (5) removing an anchor bolt of the speed reducer, filling the speed reducer with a rolling rod by using a jack and the like. The replacement method has the beneficial effects that as the key replacement technology for the mill main speed reducer is developed on the basis of making reference to the experience in installation of the main speed reducer, the technology well solves the difficulty of replacement of the raw material main speed reducer, ensures the maintenance quality of the vertical mill, shortens the construction period, and reduces the construction cost.

Description

technical field

[0001] The invention relates to a single-item construction for the replacement of the main reducer of a vertical mill suitable for a 12000t / d rotary kiln, a 5000t / d rotary kiln and a 2500t / d kiln, especially relates to a vertical mill main reducer in a cement raw meal grinding system. Reducer replacement method. Background technique

[0002] At present, there are more than 100 cement production lines invested and built at home and abroad, and each production line is equipped with a raw material grinding system. At present, there are more than 100 sets of raw material vertical mills, some of which have been in operation for more than ten years. The main reducer Some of the internal bearings and gears have been damaged during long-term high-load operation, and the damaged reducer needs to be replaced and sent to the manufacturer for maintenance. The construction of the main reducer of the mill is difficult to replace, with strict quality requirements and hi...