SU1565509A1 - Jet-disintegration mill - Google Patents

Abstract

The invention relates to combined devices for grinding solid dispersed materials, combines elements of jet and centrifugal mills, and can be used, for example, in the cement industry. The aim of the invention is to increase the efficiency of the grinding process. For this, the grinding chamber 11 is made in the form of a Lawal nozzle, in the confusor 12 of which accelerating pipes 4 with tubes 7 are placed for feeding the grinding intensifier, and in the diffuser 13 on the disks 6 along the concentric circumference are percussion elements 8, 9 and 10. As a result grinding and productivity of the mill increase. 2 Il.

Description

The invention relates to devices for grinding various materials and can be used in the construction, chemical and other industries. The purpose of the invention is to increase the efficiency of the grinding process. Figure 1 shows a jet-disintegrating mill, a longitudinal section; FIG. 2 is a section A-A in FIG. one "

The jet-disintegrating mill contains a cylindrical body 1 with a discharge pipe 2 and a pipe 3 for exhausting air. The accelerating pipes 4 are made in the form of a hollow shaft and pass through the pulleys 5, which are rigidly connected to the discs 6. Inside the accelerating pipes 4 there are tubes 7 for feeding the grinding intensifier. The disks 6 are arranged along concentric circles with percussion elements 8–10. The disks 6 form a grinding chamber 11, which has the form of a Laval nozzle and is divided into a confuser 12 and a diffuser 13. A narrowing 14 is located in the transition between the confuser 12 and the diffuser 13.

The mill works as follows.

The source material is fed into the confuser 12 of the grinding chamber 11 through accelerating pipes 4. The flow rate of energy carriers is about 70 m / s. Simultaneously with the supply of material through the tubes 7, the grinding intensifier is supplied, which is picked up by the flow of energy carrier and dispersed in the confuser 12, enveloping the particles of the material. When it enters the grinding chamber 11, the particles experience a strong frontal impact, which leads to intensive grinding. The feed intensifier grinding, Pop ,, -

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even in the microcracks formed in the particles, accelerates the destruction of the material particles. From the grinding chamber 11, under the action of centrifugal forces arising from the rotation of the disks 6, the material enters the diffuser 13, in which, under the influence of the impact elements 8-10 of the disk 6, it is crushed. With the passage of surfactant and pre-crushed material through the confuser, the flow rate at the restriction 14 increases significantly. Further, the flow enters the diffuser 13, which has a larger cross section than the restriction 14. In this case, there is a sharp drop in the flow rate, containing particles of the material being crushed, surfactant, and energy carrier, as a result of which it is turbulized. The surfactant is effectively mixed with the particles of the ground material. In the diffuser 13 is the subsequent grinding of the particles of the crushed material under the influence of shock loads from the side hit.

Claims (1)

The invention of the jet-disintegrating mill, comprising a housing, rotating in opposite directions disks with central accelerating tubes and percussion elements located on concentric circumferences facing each other surfaces of the disks and forming a grinding chamber, characterized in that the efficiency of the grinding process, the grinding chamber in cross section is made in the form of a Laval nozzle, with impact elements placed in the diffuser, and accelerating pipes in the diffuser, within the last mounted intensifier tube feed grinding.