RU2004976C1 - Drum mill repair method - Google Patents

Abstract

Usage: equipment of the mining industry, in particular drum mills containing the drum body, end caps and open gear transmission. The method of repairing drum mills consists in combining the symmetry point e of the non-drive pin 5 with the axis of rotation Os of the mill drum by moving the end cap flange 3 by the calculated value uh determined by measuring the axial displacement I of the mill drum body 1 and the end face A5 of the ring gear 10. 6 id

Description

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The invention relates to crushing and grinding equipment, in particular to drum mills comprising end caps, a drum housing and an open gear train.

The purpose of the invention is the creation of a method for repairing mills, reducing the complexity of repair and increasing the durability of drum mills by shifting the flange of the end non-drive lid to align the symmetry point of the non-drive pin with the straight line on which the axis of the gear ring and the drive pin is located, by an amount determined by calculation by measuring the magnitude of the axial displacement of the mill drum and face beat at the highest point during its rotation.

Closest to the proposed method in its technical essence is a method of repairing mills, in which, after assembling the end walls with the drum housing and installing it on the main bearings, the ring gear is mounted on the end cap flange and centered by means of gaskets made locally. of their sizes, the readings of the radial and end beats of the gear rim are made when the mill drum is rigidly fixed to the structural stand in order to prevent its axial fluctuations during the reading.

The disadvantage of this method is that it requires additional labor for the manufacture of a structural stand, the purpose of which is to firmly hold the mill drum from axial displacements, the creation of a program for its introduction into the electronic machine when calculating the sizes of gaskets made each at the place of installation under the gear ring flange, which provides only a decrease in the radial and end beats of the ring gear.

This method does not provide a reduction in the misalignment of the drive journal, as a result of which the operating conditions of the main bearings are not improved, respectively, and their service life is shorter.

The above task is ensured by the fact that the value of the face runout of the ring gear is measured at the highest point while measuring the axial displacement of the drum per revolution, then the value of the required displacement of the flange of the end non-drive cover is calculated and displaced using the power mechanism and two gaskets, thickness difference koto0

5

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rykh is equal to the value of the required displacement with the subsequent fastening of the end non-drive cover to the flange of the drum casing.

The essence of the proposed method of repair of drum mills is illustrated by the figures, the numbers on which indicate: drum housing 1, drive 2 and non-drive 3 end caps, drive 4 and drive 5 axles, main bearings b, 7, the first of which is spherical, the second is radially thrust, base plates 8, 9, ring gear 10, pinion shaft 11, eccentric bushings 12, bolts 13, gaskets 14 and 15 of different thicknesses, jack 16.

In FIG. 1 depicts a mill. The drive gear shaft 11c with a coupling and an electric motor is not shown. For the sake of clarity, the errors in the arrangement of the components of the mill are scaled up. The main lines of the mill are shown in the extreme right position. The dashed lines show the mill in the leftmost position.

The letters indicate:

B - the base surface of the ring gear 10;

R is the radius of the spherical surfaces of the bearing housing 7 and the base plate 9;

RI is the radius of the ring gear 10;

Oe is the axis of rotation of the mill drum;

C, Ci, C2 is the center of the ring gear 10 at various positions of the mill drum;

A5i - end runout of the ring gear 10 at a point located at the level of the axis of the mill drum;

AI2 - end beating of the ring gear 10 at the extreme upper point;

Dg - radial runout of the ring gear 10;

And is the value of the axial displacement of the mill drum during one revolution; a-angle formed by the base surface B of the ring gear 10 and the axis of the drive journal 4;

P - cygindrical surface of the pin 4 of the end cover 2;

О - initial position of the center of the plane of symmetry of the surface П;

SI - the position of the center of the plane of symmetry of the surface P when the mill drum is rotated 180 ° around the axis 0Ј;

02 the center of the circumference of the flange of the end cap 3;

О е 1 - the distance between the centers of the drive 4 and non-drive 5 pins on a straight line with which the axes are aligned

the gear ring 10 and the cylindrical surface P of the pin 4 at the initial position of the mill drum;

O1E 1 is the same. as Oe 1, when turning the mill drum 180 °;

Дл - the smallest distance between the point Ј and the straight line ОЕ т;

M - spherical surface of the bearing shell 7;

Mi is the spherical surface of the base plate 9;

fli is the cylindrical sliding surface of the bearing shell 7;

Dp1 is the calculated value of the required movement of the end cap flange 3;

e is the point of symmetry of the neck of the drive axle 5;

Ј1 is the point lying on the extension of the straight line with which the axes of the ring gear 10 and the journal 4 of the end cover 2 are aligned at the initial position of the drum;

E 2 - the same as Ј1, when the mill drum is rotated 180 °;

In FIG. 2 is a section AA in FIG. 1; in FIG. 3 - mill drum after repair of the proposed method; in FIG. 4 - node I in FIG. 3; in FIG. 5 is a section BB in FIG. 6; in FIG. 6 is a view along arrow B in FIG. 3.

An example of a mill repair by the proposed method (Fig. 1).

For such repairs, the following conditions are necessary.

The axis of the surface P of the pin 4 must be aligned with the axis of the ring gear 10, and the angle a should be as accurate as possible 90 °.

The flange of the end non-drive cover 3 and the flange of the drum casing 1 on the non-drive side must be drilled from the same installation together, and the diameter of the holes for the draft bolts should be some amount larger than the diameter of the bolt rod 13 (Fig. 5).

In order to determine the direction and the required amount of displacement of the end cover 3 relative to the flange ai of the drum body 1, it is necessary to measure the value of the end face of the gear ring 10 at the upper point by slowly turning the mill drum with the simultaneous reading of the value of the axial displacement of the entire drum in one revolution by setting the indicator in the center rotation of one of the pins.

By calculation according to the obtained measurements of the beating of the ring gear 10 and axial

0

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0

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0

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5

the movement of the drum, knowing the remaining geometric dimensions of the constituent parts of the mill, determine Dgp - the amount of movement of the flange of the end cap 3 relative to the flange ai of the drum body 1

To carry out this operation, it is necessary to rotate the point of greatest beating of the ring gear 10 together with the mill drum to the upper position

The magnitude of the required displacement of point Ј 1 is determined by the formula.

.5 (DD2-I) Oe1 RI

The value of Ahi is determined by the same formula, taking into account the length of the segment 002.

By manufacturing the gaskets 14 and 15, the thickness difference of which is Ahi, and installing them on the jack 16, as shown in FIG. 4, the flange of the end cap 3 is moved relative to the flange ai of the drum body 1.

In this case, the fasteners (bolts 13) must be loosened so as not to impede the movement of the flanges relative to each other, and in the horizontal plane passing through the axis of the flanges of the drum housing 1 and the end cover 3, it is necessary to provide clamps to prevent the displacement of these flanges in horizontal direction.

In addition, the housing 1 of the drum must contain stiffeners to prevent deformation of the flange ai.

The fixing of the flanges after adjusting the beating of the ring gear 10 can be done, for example, by means of eccentric bushings 12 installed in the finishing holes and bolts 13 (Fig. 4).

In this way, the service life of the gear pair, the main bearing shell 7 and the entire mill as a whole is increased by reducing the end face runout of the gear rim 10.

In order to prevent the main bearing shell 6 from swaying from the side opposite to the drive, it is advisable to make its sliding friction surface spherical during each revolution of the mill, which will increase its service life due to uniform wear of the friction surface.

(56) CIM Bulletin, vol. 78, isk 882, October 1985, p. 29-37.

Claims (1)

The claims METHOD FOR REPAIR OF DRUM MILLS installed on main bearings, including. sequential centering of the axle of the end drive cover, the ring gear and the axle of the end drive cover relative to the axis of the drum body, characterized in that, in order to reduce the laboriousness of the repair and increase the durability of the drum mills, determine the value of the face runout of the gear 8 fairy / & 1 the crown when it is rotated at the highest point while measuring the value of the axial displacement of the drum in one revolution, then the calculated value of the required displacement of the flange of the end non-drive cover is determined and displaced using the power mechanism and two gaskets, the thickness difference of which is equal to the value of the required displacement followed by fixing the end non-drive cover to the flange of the drum housing. / 0 j H l H J I f 3 / 777777/77 / flfogj / T Dg -1- /////////// 9 (put. 4 5 sixteen FIG. 6