CN216150013U - Lining structure of semi-autogenous mill's well hole axle - Google Patents

Abstract

The utility model provides an inner lining structure of a middle hole shaft of a semi-autogenous mill, which comprises a feeding lining sleeve, wherein the diameter of a sleeve of the feeding lining sleeve positioned at the inner end of the middle hole shaft of a mill cylinder is a conical hole with a large inner end and a small outer end, the cone angle alpha between the hole wall and the end surface is 25-35 degrees, the end surface of an external flange at the inner end of the feeding lining sleeve is abutted against a cylinder cavity inner lining of the semi-autogenous mill, an outer flange at the outer end of the feeding lining sleeve is abutted and matched with the inner end of an inner lining pressing sleeve, and the outer end of the inner lining pressing sleeve is connected with the outer end of the middle hole shaft. In the above scheme, the inner pipe hole of the feeding lining is a conical hole with a large inner end and a small outer end, and the cone angle alpha between the hole wall and the end surface is 25-35 degrees, namely the cone angle alpha between the hole wall and the radial direction is 25-35 degrees, and the preferred cone angle alpha is 30 degrees, so that the influence caused by material impact can be ensured to be reduced, the guiding of materials is facilitated, the impact force applied in the direction perpendicular to the hole wall is reduced, the stress condition of the feeding lining can be improved, and the service life of the feeding lining is prolonged.

Description

Lining structure of semi-autogenous mill's well hole axle

Technical Field

The utility model relates to an improvement on the structure of an inner bushing of a middle hole shaft of a semi-autogenous mill.

Background

The semi-autogenous mill with the diameter of 5.8 multiplied by 5.8m is a common main line device of a mineral separation workshop, the hollow shaft at the feeding port is an important part for bearing the rotation of the semi-autogenous mill cylinder, and the inner wall of the hollow shaft is provided with the feeding lining connected with the lining of the semi-autogenous mill cylinder, which plays an important role in protecting the hollow shaft from being impacted and worn by materials when feeding materials, and although the feeding lining belongs to a wearing part, the normal production can be influenced by frequent replacement of the feeding lining. The normal service life of the prior art feeder bushings is only about 10 months during actual production practices. The material bearing part of the feeding lining is basically positioned in an annular area, and because the material is impacted greatly and is continuously abraded, the wear-resistant plate welded at the upper later stage and the lower later stage of the wear-resistant plate is extremely easy to break and fall off, and the abrasion of the feeding lining can not be effectively avoided; the wear-resisting plate needs to be replaced after stopping in 2 months on average, the feeding bushing needs to be replaced every 10 months or so, the time for replacing the bushing is about 3 days each time, and great influence is generated on production organization; the cost of replacing the feeding bushing and the wear-resisting plate is high, the overhaul time is long, the overhaul difficulty is high, and the maintenance cost of the equipment is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lining structure of a middle hole shaft of a semi-autogenous mill, which improves the stress condition of a feeding lining so as to prolong the service life of the feeding lining.

A lining structure of a middle hole shaft of a semi-autogenous mill, which comprises a feeding lining, and is characterized in that: the diameter of a sleeve of a feeding bushing positioned at the inner end of a mesoporous shaft of a mill cylinder is a conical hole with a large inner end and a small outer end, the taper angle alpha between the hole wall and the end surface is 25-35 degrees, the end surface of an external flange at the inner end of the feeding bushing is abutted against a cylinder cavity lining of a semi-autogenous mill, an outer flange at the outer end of the feeding bushing is abutted against the inner end of a lining pressing sleeve, and the outer end of the lining pressing sleeve is connected with the outer end of the mesoporous shaft.

In the above scheme, the inner pipe hole of the feeding lining is a conical hole with a large inner end and a small outer end, and the cone angle alpha between the hole wall and the end surface is 25-35 degrees, namely the cone angle alpha between the hole wall and the radial direction is 25-35 degrees, and the preferred cone angle alpha is 30 degrees, so that the influence caused by material impact can be ensured to be reduced, the guiding of materials is facilitated, the impact force applied in the direction perpendicular to the hole wall is reduced, the stress condition of the feeding lining can be improved, and the service life of the feeding lining is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 and 3 are schematic structural views of the feeding bush and the inner liner pressing bush in the utility model.

Detailed Description

The utility model provides an inside lining structure of mesopore axle of semi-autogenous mill, including feeding bush 20, the interior pipe hole of feeding bush 20 that is located mesopore axle 31 inner end of mill barrel 10 is the taper hole that the inner end is big, the outer end is little and the cone angle between pore wall and the terminal surface is cone angle alpha and is 25 ~ 35, the terminal surface of the external flange 21 of feeding bush 20 inner end supports and leans on the barrel chamber inside lining of semi-autogenous mill, the outer flange 22 of feeding bush 20 outer end supports the press fit with the inner end of inside lining pressure sleeve 30, the outer end of inside lining pressure sleeve 30 links to each other with mesopore axle 31 outer end.

In the above solution, the fact that the inner bore of the feed liner 20 is defined as a conical bore with a large inner end and a small outer end and the angle of taper α between the bore wall and the end face is 25 ° to 35 ° defines the axial dimension of the feed liner 20, since the inner and outer end trepanning dimensions of the feed liner 20 are substantially determined, the axial dimension of the feed liner 20 can be calculated from trigonometric piping. The core point of the scheme is to optimize the space relation between the inner wall of the feeding bush 20 and the material blanking path, so that the smooth falling of the material is ensured, and the abrasion caused by the vertical scouring of the material on the inner wall of the feeding bush 20 is avoided. Practical use proves that after the structure is improved, the service life of the feeding bushing 20 is prolonged by 12-16 months, namely the service life of the feeding bushing 20 can reach 2 years.

The outer end pipe orifice of the feeding bushing 20 is provided with a material sealing ring 40, the inner wall of the material sealing ring 40 is provided with rib plates 41 which are axially and radially arranged to enclose a net-shaped box 42 which is uniformly distributed on the inner wall of the material sealing ring 40, the opening of the net-shaped box 42 points to the direction of the shaft core, and the aperture of the material sealing ring 40 is matched with the pipe diameter of the outer end of the inner lining pressing sleeve 30. In the above scheme, the feeding chute 50 inevitably generates material collision and splashing phenomena in the guiding process, the material sealing ring 40 performs enclosure and stores the material into the corresponding net box 42, and the net box 42 is dumped into the feeding chute 50 and flows back into the barrel cavity when rotating to a high position along with the barrel of the mill barrel 10. The inner liner sleeve 30 is held captive from the outer end against the feed liner 20 at the outer end mouth of the feed liner 20.

The sealing ring 40 and the feeding lining 20 form a smooth area for arranging the feeding chute 50 with the inclination larger than and close to 30 degrees. It should be noted that the shape of the sealing ring 40 and the feeding bush 20 is a sleeve shape, and the vacant area thereof is maintained in a sleeve shape during the rotation, which needs to provide an arrangement space for the arrangement of the charging chutes 50, and the included angle between the charging chutes 50 and the horizontal direction of the space is more than 30 degrees, otherwise, the material is retained, so that the included angle is not more than 30 degrees when the included angle is more than 30 degrees, and therefore, the included angle is preferably more than and close to 30 degrees, thereby reducing the flow speed on the premise of ensuring the smoothness of the materials.

In order to further improve the wear resistance of the feeding bush 20, the hole wall of the feeding bush 20 is an inward convex smooth curved surface, the inward convex is a convex surface protruding towards the shaft core direction, the surplus amount of the feeding bush 20 corresponding to a material rinsing area is properly increased, the service life of the feeding bush 20 can be further prolonged, the curvature of the inward convex smooth curved surface is not too large, proper curvature is ensured, and otherwise the material is easily thrown upwards.

In addition, the length and the inclination angle of the original chute are properly adjusted corresponding to the new structure provided by the utility model, so that the parabola of the material can avoid the feeding lining 20 as much as possible and directly fall into the cylinder; the utility model is designed on the basis of phi 5.8 multiplied by 5.8m semi-autogenous grinding purchased and used by the applicant, the basic scheme is suitable for grinding mills of other specifications, and the specific size of the feeding bush 20 is determined according to the specification and the size of the hollow shaft 11 of the corresponding grinding mill.

Claims (4)

1. A lining structure of a medium-hole shaft of a semi-autogenous mill, comprising a feed bushing (20), characterized in that: the inner pipe hole of the feeding bushing (20) positioned at the inner end of the middle hole shaft (11) of the mill cylinder (10) is a conical hole with a large inner end and a small outer end, the cone angle between the hole wall and the end surface is 25-35 degrees, the end surface of the external flange (21) at the inner end of the feeding bushing (20) is abutted against the cylinder cavity lining of the semi-autogenous mill, the external flange (22) at the outer end of the feeding bushing (20) is abutted against and matched with the inner end of the lining pressing sleeve (30), and the outer end of the lining pressing sleeve (30) is connected with the outer end of the middle hole shaft (11).

2. The liner structure of claim 1 wherein: the feeding device is characterized in that a material sealing ring (40) is arranged at the outer end pipe orifice of the feeding bushing (20), rib plates (41) which are axially and radially arranged on the inner wall of the material sealing ring (40) are enclosed into a net-shaped box (42) which is uniformly distributed on the inner wall of the material sealing ring (40), the opening of the net-shaped box (42) points to the direction of a shaft core, and the aperture of the material sealing ring (40) is matched with the outer end pipe diameter of the lining pressing sleeve (30).

3. The liner structure of claim 2 wherein: the arrangement inclination beta of the feeding chute (50) formed by the material sealing ring (40) and the feeding lining (20) in a forward area is larger than 30 degrees.

4. The liner structure of claim 1 wherein: the hole wall of the feeding lining (20) is an inward convex smooth curved surface.

Images