RU2321459C1 - Tumbling mill lining - Google Patents

Abstract

FIELD: mechanical engineering; milling equipment.

SUBSTANCE: proposed lining contains elastomer plates connected along tumbler. Lower parts of plates are provided with mounting fittings and are connected by fasteners with mill tumbler. Upper parts of each plate are made in form of trapezium whose front, middle and rear faces form sinusoidal wavy working surface of lining. Plates are furnished with metal dowels in form of parallelepipeds partially cured in front and middle faces of plates and arranged at acute angle to axis of tumbler. Slots are made over perimeter of curved part of dowels being filled up with elastomer material of plates, and two cylindrical pins are made in base of dowels, two in each dowel, passed through holes in mounting fittings so that space between bases of dowels and mounting fittings is filled with elastomer material of plates.

EFFECT: increased capacity and service life of mill, reduced mass of lining.

7 cl, 8 dwg

Description

The invention relates to grinding equipment, in particular to the linings of drum mills, made in the form of plates of elastomeric material with vulcanized spikes, and can be used in metallurgical, mining, construction, chemical and other industries when grinding lump materials.

From the prior art it is known closest to the claimed technical essence, the number of common features and the achieved result, the lining of the drum mill, containing plates connected along the drum made of elastomeric material, in which the upper parts form a wave working surface of the lining and are equipped with partially vulcanized metal spikes, and the lower parts have mounting fittings and are connected via fasteners to the mill drum / SU 948439 (All-Union Scientific Research The first design and development technological institute of labor mechanization in the steel industry) 08/07/1982, the closest analogue is the prototype /.

Plates in cross section have the shape of a tetrahedron, the upper face of which is tilted in the direction of rotation of the drum.

Metal spikes are made in the form of cylinders with a conical lateral surface of the protruding part and a smooth cylindrical surface of the vulcanized part.

In such a lining, the wave working surface of the plates has a sawtooth shape.

Although this somewhat improves the dynamics and intensity of grinding material in the drum as a whole, it actually excludes from the grinding process the front spikes of lower height, which are “shadowed” behind the rear spikes of higher height in the layout.

As a result of this arrangement, the spikes of greater height are subjected to more intense impact and abrasive impact of the balls and the crushed material and therefore are destroyed much faster than the other spikes.

And the presence of spikes of less height not involved in the grinding process increases the weight of the lining.

Due to the fact that during the operation of the mill, the lining spikes are subject to significant shock loads from falling balls and pieces of crushed material, and the vulcanized parts of the spikes have a smooth surface, the latter are loosened and fall out of the plates, which reduces the reliability of their connection with the elastomeric plate material and reduces the life of the lining.

The technical problem to which the invention is directed is to improve the efficiency of grinding lump material, reduce the number of spikes and increase the reliability of the connection of the vulcanized part of the spikes with the elastomeric material of the lining plates.

The technical result that is achieved by using the invention is to increase productivity, reduce the weight of the lining, as well as increase the life of the drum mill.

The technical problem is solved, and the technical result is achieved in that in the lining of a drum mill containing plates connected along the drum made of elastomeric material, in which the upper parts form the wave working surface of the lining and are equipped with partially vulcanized metal spikes, and the lower parts have installation fittings and connected by means of fasteners to the mill drum, according to the invention, the upper parts of each plate are in the form of a trapezoid, the front, middle and rear faces which form a sinusoidal wave working surface of the lining, while the metal spikes are made in the form of parallelepipeds, vulcanized into the aforementioned front and top faces of the plates and are located at an acute angle to the axis of the drum, and along the perimeter of the vulcanized part of the spikes there are grooves filled with elastomeric material of the plates, and the base of the studs is made of two cylindrical fingers, passed into the holes of the installation fittings so that the space between the bases of the studs and the installation fittings is filled eno elastomeric material plates.

This combination of general and basic distinctive essential features that characterize the claimed lining of a drum mill is not known from the prior art, is new and sufficient in all cases to which the scope of legal protection applies.

The causal relationship of the distinctive features in their interaction with the known features in achieving the expected technical result due to the technical task is as follows.

Thus, the implementation of the upper parts of each plate in the form of a trapezoid, the front, middle and rear faces of which form a sinusoidal wave working surface of the lining, allows for the active participation of all faces of the plates in the grinding process, a more uniform distribution of impact loads on the plates from falling balls and pieces of the crushed material , which significantly increases the grinding efficiency of the material and the service life of the lining.

The execution of metal spikes in the form of parallelepipeds and their vulcanization in the above-mentioned only front and top faces of the plates significantly increases the cross-sectional area of the spikes, and consequently the contact area of grinding in comparison with cylindrical spikes (prototype), increases the grinding efficiency and reduces the total weight of the studs and lining generally.

The location of the spikes at an acute angle to the axis of the drum allows you to form a spiral translational movement of the crushed material to the discharge pipe of the drum mill, which increases its productivity.

Performing along the perimeter of the vulcanized part of the spikes of the grooves filled with the elastomeric material of the plates, provides a strong and reliable connection of the spikes to the plates.

And due to the fact that two cylindrical fingers are made at the base of the studs, passed into the holes of the mounting fittings so that the space between the bases of the studs and the mounting fittings is filled with elastomeric material of the plates, the studs are technologically planted in a specific design position without contact with the mounting fittings of the plates .

Due to this, a guaranteed cushioning of the studs with elastomeric material is achieved when balls and lump material fall on them, which reduces shock loads and increases the service life of the drum mill.

In addition, the claimed lining of the drum mill has other features that are different from the prototype, which develop, supplement and characterize the invention in some cases of its implementation and are used depending on the specific conditions of manufacture and operation.

So, in the inventive lining of the drum mill according to the invention, the spikes are vulcanized in the front and middle faces of the plates at an acute angle α = 30-45 ° to the axis of the drum.

This arrangement of the spikes in the front and middle faces of the plates provides an optimal spiral translational movement of the crushed material to the discharge nozzle of the drum mill, which increases its productivity.

The indicated acute angle α of the spikes to the axis of the drum is determined empirically and is optimal for this design of the lining and provides the best combination of the quality of grinding material and the performance of the drum mill.

The choice of this angle is less than the lower limit (α = 30 °) is impractical, since in this case the path length of the material increases in a spiral, as a result of which the productivity of the drum mill decreases

The choice of this angle is greater than the upper limit (α = 45 °) is also impractical, since in this case the length of the path of the material along the spiral decreases, resulting in a decrease in the quality of grinding.

In the inventive lining of the drum mill according to the invention, the spikes vulcanized in the front faces of the plates are beveled at an angle β = 20-30 ° in the direction of rotation of the drum.

The execution of the mentioned bevel provides a decomposition of the reaction forces from falling balls and pieces of material on these spikes into vertical and horizontal components.

In this case, the vertical components of these reactions are aimed at efficiently grinding the bulk material, and the horizontal components of these reactions are directed tangentially to the helical spiral and facilitate the movement of the crushed material to the discharge pipe of the drum mill, which increases its productivity.

The selected bevel angle of the studs, vulcanized in the front faces of the slabs, is determined empirically, is optimal for this design of studs and provides the best combination of the quality of grinding material and the performance of the drum mill.

The choice of this angle is less than the lower limit (β = 20 °) is impractical, since in this case the horizontal components of these reactions are reduced, as a result of which the productivity of the drum mill is reduced.

The choice of this angle above the upper limit (β-30 °) is also impractical, since in this case the vertical components of these reactions are reduced, as a result of which the intensity and quality of grinding of the material are reduced.

In the inventive lining of the drum mill according to the invention, the spikes are vulcanized in the front and middle faces of the plates so that their protruding parts above the surfaces of the faces of the plates are h = 30-50 mm in height.

This height of the protruding parts of the studs is determined empirically and is optimal in a given range for booking the elastomeric material of the plates and increasing the service life of the lining.

The choice of the height of the protruding parts of the studs is less than the lower limit (h = 30 mm) is impractical, since in this case there is a rapid wear of the protruding parts of the studs, resulting in reduced lining life.

The choice of the height of the protruding parts of the studs above the upper limit (h = 50 mm) is also not advisable, since in this case the mass of the studs and the lining as a whole increases.

In the inventive lining of the drum mill according to the invention, the spikes in the front and middle faces of the plates are vulcanized with the same interval equal to t = 30-60 mm.

Such an interval of the spikes in the front and middle faces of the plates is determined empirically and is optimal in a given range for booking the elastomeric material of the plates and increasing the service life of the lining.

The choice of the spacing of the spikes in the front and middle faces of the plates less than the lower limit (t = 30 mm) is impractical, since in this case the mass of the spikes and the lining as a whole increases.

The choice of the spacing of the spikes in the front and middle faces of the plates above the upper limit (t = 60 mm) is also impractical, since in this case the distance between the spikes increases, the number of spikes decreases and the quality of grinding of the material decreases.

In the inventive lining of a drum mill according to the invention, trapezoidal grooves are made along the perimeter of the vulcanized part of the spikes with a width of a larger base located on the side surface of the spike equal to s = 10-20 mm and a depth equal to b = 10-20 mm.

Performing along the perimeter of the vulcanized part of the spikes of the trapezoidal grooves with the aforementioned width and depth provides reliable and guaranteed filling of the grooves with elastomeric material in the manufacture of plates with spikes in the mold, as well as a strong and reliable connection of the spikes with the plates.

The selected width and height of the trapezoidal grooves of the vulcanized parts of the tenons is determined empirically and is optimal to ensure a strong and reliable connection of the tenons to the plates.

The choice of the width and height of the trapezoidal grooves of the vulcanized parts of the studs is less than the lower limit (s = 20 mm and b = 20 mm) is impractical, since in this case the technological ability to fill them with an elastomeric material and the adhesion strength of the vulcanized part of the studs to the elastomeric material of the plates are reduced.

The choice of the width and height of the trapezoidal grooves of the vulcanized parts of the spikes more than the upper limit (s = 20 mm and b = 20 mm) is also not advisable, since in this case the depreciation capacity decreases; as well as the weight and strength of the studs, resulting in reduced lining life.

In the inventive lining of the drum mill, according to the invention, the distance between the bases of the spikes and the mounting fittings is δ = 10-15 mm

The choice of the distance between the bases of the spikes and the mounting fittings within the specified limits provides reliable and guaranteed cushioning of the spikes with elastomeric material when balls and lump material of a drum mill fall on them.

The selected distance between the bases of the studs and the mounting fittings is determined empirically and is optimal for the effective damping of shock loads on the studs.

The choice of the distance between the bases of the studs and the mounting reinforcement less than the lower limit (δ = 10 mm) is not feasible due to the fact that the height of the cushioning layer of elastomeric material between the bases of the studs and the mounting fittings decreases, which will affect the increase in internal stresses in the material and its early destruction .

The choice of the distance between the bases of the studs and the mounting fixture more than the upper limit (δ = 15 mm) is also impractical due to the fact that the plate thickness, the lining mass, as well as the vibrations of the studs increase, which will lead to an increase in compression and tensile stresses.

The prior art applicant did not identify technical solutions that match the general and distinctive features of the claimed lining of the drum mill, which indicates that the proposed solution is not part of the prior art and meets the criteria of the invention of "novelty".

The prior art, the applicant has not identified technical solutions that match the distinguishing features of the claimed lining of the drum mill, which indicates that the proposed technical solution for a specialist is not obvious, does not emerge explicitly from the prior art and meets the criteria of the invention "inventive step".

The invention is further explained in the detailed description of the best embodiment with reference to the accompanying drawings.

Figure 1 shows the lining of a drum mill, a cross section.

Figure 2 shows the mounting plate to the drum of a drum mill, side view.

Figure 3 shows a plate lining of a drum mill, side view.

Figure 4 shows a plate lining of a drum mill, top view.

Figure 5 shows a plate lining of a drum mill, a perspective view.

Figure 6 shows the spike, modification 1, side view.

Figure 7 shows the spike, modification 2, side view.

In Fig.8 shows a section aa in Fig.3.

The lining 1 of the drum mill is mounted inside the drum 2/1 / and contains (Fig.1-8) connected along the drum 2 (Fig.1) plate 3 made of elastomeric material.

The plates 3 on the front side have protrusions 4, and on the back side, the corresponding grooves 5, and are interconnected by an overlap.

The upper parts of the plates 3 form a wave working surface 6 of the lining 1 and are equipped with partially vulcanized metal spikes 7, 8.

The lower parts of the plates 3 have mounting fittings 9 (Fig. 8) and are connected by fasteners to the drum 2 of the mill (Fig. 2).

Fasteners include bolts 10, damping bushings 11, washers 12, and nuts 13.

The upper parts of each plate 3 has the shape of a trapezoid, the front, middle and rear faces 14, 15, 16 of which form a sinusoidal wave working surface 6 of the lining 1 (Fig.1-3).

The metal spikes 7 (modification 1) (FIG. 6) and 8 (modification 2) (FIG. 7) are made in the form of parallelepipeds, vulcanized into the said front and upper faces 14, 15 of the plates 3 and are located at an acute angle α to the axis of the drum 2 .

Along the perimeter of the vulcanized part of the spikes 7, 8, trapezoidal grooves 17 are made, filled with the elastomeric material of the plates 3 (Fig. 8).

At the base of the studs 7, 8 (Fig. 6, 7), two cylindrical fingers 18 are made, passed into the holes 19 of the mounting fittings 9 so that the space between the bases of the studs 7, 8 and the mounting fittings 9 is filled with the elastomeric material of the plates 3 (Fig. 8 )

The spikes 7, 8 are vulcanized in the front and middle faces 14, 15 of the plates 3 at an acute angle α = 30-45 ° to the axis of the drum 2 (figure 4).

The spikes 7 (Fig.6), vulcanized in the front faces 14 of the plates 3, are made with a bevel at an angle β = 20-30 ° in the direction of rotation of the drum 2.

The spikes 7, 8 are vulcanized in the front and middle faces 14, 15 of the plates 3 so that their protruding parts above the surfaces of the faces 14, 15 of the plates 3 are h = 30-50 mm in height.

The spikes 7, 8 in the front and middle faces 14, 15 of the plates 3 are vulcanized with the same interval equal to t = 30-60 mm.

Along the perimeter of the vulcanized part of the studs 7, 8, trapezoidal grooves 17 are made with a width of a larger base located on the side surface of the stud 7, 8, equal to s = 10-20 mm, and a depth equal to b = 10-20 mm.

The distance between the bases of the studs 7, 8 and the mounting fittings 9 (Fig. 8) is δ = 10-15 mm.

The lining of 1 drum mill operates as follows.

During the rotation of the drum 2 / Fig. 1/, for example, in the clockwise direction, the mill load (balls and lump material) falls on the plates 3 and on the metal studs 7, 8 of the lining 1 and partially vulcanized in their front and middle faces 14, 15 and carried away by its wave work surface 6.

In this metal spikes 7, 8 of the plate 3 of the lining 1, located in the lower position, capture the mill load and raise them to a certain height.

The raised mill load at a certain height slides from the metal spikes 7, 8 of the plates 3, falls down and crushes the bulk material located in the lower part of the drum 2.

In this case, the upper parts of each plate 3, made in the form of a trapezoid, the front, middle and rear faces 14, 15, 16 of which form a sinusoidal wave working surface 6 of the lining 1, ensure the active participation of all faces 14, 15, 16 of the plates 3 in the grinding process.

Due to this, there is a more uniform distribution of shock loads on plates 3 from falling balls and pieces of crushed material, which significantly increases the efficiency of grinding the material and the service life of the lining 1.

Moreover, the metal spikes 7, 8, made in the form of parallelepipeds and vulcanized only in the front and top faces 14, 15 of the plates 3, provide a significant increase in the cross-sectional area of the spikes 7, 8, and therefore the contact area of grinding.

This increases the grinding efficiency and reduces the total weight of the spikes 7, 8 and the lining 1 as a whole.

Due to the fact that the spikes 7, 8 are arranged at an acute angle α = 30-45 ° to the axis of the drum 1, this allows you to form a spiral translational movement of the crushed material to the discharge pipe of the drum mill, which increases its productivity.

Due to the beveling on metal spikes 7, at an angle β = 20-30 ° in the direction of rotation of the drum 2, the reaction forces are decomposed from falling balls and pieces of material into these spikes 7 into vertical and horizontal components.

At the same time, the vertical components of these reactions provide effective grinding of bulk material.

And the horizontal components of these reactions are directed tangentially to the helical spiral and facilitate the movement of the crushed material to the discharge port of the drum mill, which increases its productivity.

Spikes 7, 8 made along the perimeter of the vulcanized part, trapezoidal grooves 16, filled with the elastomeric material of the plates 3, provide a strong and reliable connection of the spikes 7, 8 with the plates 3.

The cylindrical fingers 18 at the base of the studs 7, 8, passed into the holes 19 of the mounting fixture 9 so that the space between the bases of the studs 7, 8 and the mounting fixture 9 is filled with the elastomeric material of the plates 3, provide a technological landing of the studs 7, 8 in a specific design position without contact with installation fittings 9 plates 3.

Due to this, good cushioning of the spikes 7, 8 with elastomeric material is achieved when balls and lump material fall on them, which reduces shock loads and increases the service life of the drum mill.

As a result of this, effective grinding of the lump material takes place.

At the same time, an increase in productivity, a decrease in the mass of the lining 1, as well as an increase in the service life of the drum mill are achieved.

The proposed lining of the drum mill meets the criteria of the invention "industrial applicability", as it can be repeatedly manufactured in industrial production using standard equipment, modern materials and technology at any polymer production enterprise.

Notation list

1. Lining

2. Drum

3. Cooker

4. The ledge plate 3

5. Groove plate 3

6. The wave working surface of the lining of the drum mill

7. Metal spike (modification 1)

8. Metal spike (modification 2)

9. Mounting plate 3

10. The bolt

11. Bushing

12. Washer

13. Nut

14. The front face of the plate 3

15. The middle edge of the plate 3

16. The back face of the plate 3

17. Trapezoidal groove of the cleat 7, 8

18. The cylindrical finger of the spike 7, 8

19. The hole of the mounting fittings 9 plate 3

Claims (7)

1. The lining of the drum mill, containing plates connected along the drum, made of elastomeric material, in which the upper parts form the wave working surface of the lining and are equipped with partially vulcanized metal spikes, and the lower parts have mounting fittings and are connected by means of fasteners to the mill drum, characterized the fact that the upper parts of each plate has the shape of a trapezoid, the front, middle and rear faces of which form a sinusoidal wave working surface of the lining, metal spikes are made in the form of parallelepipeds, vulcanized into the aforementioned front and top faces of the plates and are located at an acute angle to the axis of the drum, moreover, along the perimeter of the vulcanized part of the spikes, grooves are filled with elastomeric material of the plates, and two cylindrical fingers are made at the base of the spikes, passed into the holes of the installation fittings so that the space between the bases of the spikes and the installation fittings is filled with elastomeric material of the plates. 2. The lining of the drum mill according to claim 1, characterized in that the spikes are vulcanized in the front and middle faces of the plates at an acute angle α = 30-45 ° to the axis of the drum. 3. The lining of the drum mill according to claim 1, characterized in that the spikes vulcanized in the front faces of the plates are beveled at an angle β = 20-30 ° in the direction of rotation of the drum. 4. The lining of the drum mill according to claim 1, characterized in that the spikes are vulcanized in the front and middle faces of the plates so that their protruding parts above the surfaces of the faces of the plates in height are h = 30-50 mm. 5. The lining of the drum mill according to claim 1, characterized in that the spikes in the front and middle faces of the plates are vulcanized with the same interval equal to t = 30-60 mm. 6. The lining of the drum mill according to claim 1, characterized in that around the perimeter of the vulcanized part of the spikes are made trapezoidal grooves with a width of a larger base located on the side surface of the spike equal to s = 10-20 mm and a depth equal to b = 10-20 mm . 7. The lining of the drum mill according to claim 1, characterized in that the distance between the bases of the studs and the mounting fittings is δ = 10-15 mm

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