RU2021025C1 - Pulverizing mill - Google Patents

Abstract

FIELD: manufacture of industrial building materials. SUBSTANCE: pulverizing mill has revolving cylinder with milling bodies and housing auxiliary cylinder rigidly attached to main cylinder. It is positioned in dead zone of milling charging and material and is provided with coaxially mounted branch pipe. End walls of auxiliary cylinder positioned from pipe line to shell are plugged. EFFECT: enhanced operating capabilities. 3 dwg

Description

 The invention relates to techniques for grinding materials and can be used in industrial materials.

 Various mills for grinding materials are known.

 The closest in technical essence and the achieved results is a mill containing loading and unloading devices, housing, horizontal support, working body, dampers.

 In such a mill, the crushed material is loaded inside the body rotating at supercritical speed and enters the working area between the lining and the working body.

 A disadvantage of the known mill is the low grinding efficiency due to the same speed conditions along the entire length of the drum.

 The aim of the invention is to increase the grinding efficiency.

 This goal is achieved by the fact that in a known mill containing a rotating drum with grinding media, inside of which an additional drum is located, is rigidly attached to the main drum, located in the dead zone of the grinding feed and material and equipped with a pipe coaxially located in it, and the end walls of the additional drum from piping to the shell muffled.

 Figure 1 presents the proposed mill, a longitudinal section; in FIG. 2 and 3, respectively, sections along aa and bb in FIG.

 Inside the main rotating drum 1 with grinding media and grids 2 and 3 coaxially with the brackets 4, an additional drum 5 with plugs 6 is fixed. A pipe 7 can be arranged along the axis of the drums. Diameter of the drum 5 is determined by calculation depending on the speed and fill factor of the grinding media and material from the condition of its location in the dead zone of grinding media and material, taking into account its elimination due to filling with falling grinding media and material.

 The length of the drum 5 is made slightly less than the distance between the grids 2 and 3 to ensure the normal operation of the latter. The diameter of the pipeline 7 is determined by calculation from the condition of providing a given resistance to the passage of aspiration air. Chamber 8 is filled with large balls, chamber 9 is filled with small balls or tsilpebs. The remaining dimensions are determined constructively and checked for strength and performance.

 The mill operates as follows. After preliminary grinding of the material in the chamber 8, it enters through the grate 2 into the chamber 9, where together with the grinding bodies it rises upward by the drum 1 until they begin to fall, however, when the dead zone falls, as in chamber 8 (see Fig. .3), it does not form, since the grinding media and material are guided by the drum 5 to the lifting grinding media and material, some of them falling down, and some are picked up by the lifting grinding media and material, forming a multilayer cycle without a dead zone, the height of which is greater than if not the bottom of the drum 5. The crushed material passes through the grate 3 due to the backwater and aspiration, including through the pipe 7.

 The use of the mill will increase the grinding efficiency by eliminating the dead zone, which will increase productivity and reduce specific energy consumption.

Claims (1)

 FINE GRINDING MILL, containing a rotating drum with grinding media, in which an additional drum is located, characterized in that, in order to increase the efficiency of the grinding process, the additional drum is rigidly attached to the main drum, located in the dead zone of the grinding feed and material, and is equipped with it coaxially located in it pipeline, and the end walls of the additional drum from the pipe to the shell are muffled.

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