SU1674962A1 - Centrifugal impact crusher - Google Patents

Abstract

The invention relates to the crushing of solid materials and provides increased crusher reliability. The crusher includes a housing 1 with reflective surfaces S 6 1518 / J / 2. A vertical drive shaft 7 with a rotor 10 having accelerating channels 14 and accelerator rollers 17 mounted on axles 16 17. A cylindrical shell 6 is installed in the upper part of housing 1 Satellite x rollers 18 are fixed on axis x 16; they are in contact with the inner surface of cylindrical shell 6. Radius of satellite rollers 18 is determined by the formula Rj (K / R2 - 1 / R) 1. where R2 is the radius of rolicov-successor 17, RI is the radius of installation of the axes 16, K 1.5-2.5. The crusher has a loading hopper 3, a feed pipe 4 and a discharge opening 5. The rotor 10 is made 13 of the upper arm 11 and the lower 12 disks and has a loading opening 13 2 d., 1 tab. 1 W Ё (vj Ј Ю Ю ON ю Фм1

Description

The invention relates to the field of crushing solid materials, namely, centrifugal impact crushers, and can be used, for example, in the mining and metallurgical industries for crushing mineral raw materials, as well as in other industries.

The purpose of the invention is to increase the reliability of the crusher.

FIG. 1 schematically shows a centrifugal impact crusher, general view, frontal section: in FIG. 2 shows section A-A in FIG. one.

The centrifugal impact crusher comprises a housing 1 with reflective surfaces 2. A housing 1 is equipped with a hopper 3 with a supply pipe 4 and a discharge opening 5. A cylindrical shell 6 is installed above the reflective surfaces 2 in the housing 1 on the vertical shaft 7, driven in rotation from the electric motor 8 by means of a V-belt transmission 9, a rotor 10 is installed, comprising a top 11 and a bottom 12 disks, a loading opening 13, acceleration channels 14. At the periphery of the rotor 10 in bearing supports 15 fixed to the upper 11 and lower 12 disks of the rotor 10, vertical axes 16 are installed. Accelerators 17 are located on the vertical axes x16 between the disks 11 and 12 of the rotor 10, and the satellite rollers 18 are located above the upper disk 11 of the rotor 10 vehicle in frictional engagement with the inner surface of the cylindrical shell 6.

Centrifugal impact crusher works as follows.

The source material through the loading hopper 3, feeding pipe 4, the loading opening 13 of the rotor 10 enters the acceleration channels 14. Satellite rollers 18, rolling back along the inner surface of the cylindrical shell 6, perform a planetary rotational movement and through vertical axes 16 convey this movement to the rollers accelerators 17. The recyclable material from the acceleration channels 14 enters the accelerator rollers 17, while the linear velocity of the surface of the accelerator rollers 17 is close to the relative velocity of the material at its output and s overclocking channels 14, i.e. the relative velocity of the surface of the accelerator rollers 17 and the flow of material is close to zero. The material, moving together with the surface of the accelerator rollers 17. upon reaching the point of departure, is ejected at a high absolute speed and, falling on the reflective elements 2, is destroyed. The crushed product is discharged through the discharge opening 5.

Additional installation in the upper part of the housing 1 of the cylindrical shell crusher 6, and on the vertical axis x 16 accelerator rollers 17 satellite rollers 18,

adjacent to the inner surface of the cylindrical shell 6, allows the accelerator rollers 17 to be forced to rotate, using only the main drive of the crusher for this purpose. However, if

rotation of the accelerator rollers 17 in such a way that the linear speed of their surface is equal to or close to the speed of the material in the exit section of the accelerating channels 14 of the crusher rotor, the wear of the surface of the accelerator rollers 17 will be reduced. In this case, the jamming of the accelerator rollers during operation is eliminated, since they are forced to rotate by means of

friction transmission, and in case of jamming it will be eliminated with the consumption for this part of a powerful main drive.

To ensure equality of linear

the speed of the surface of the accelerator rollers 17 and the relative speed of movement of the material in this area it is necessary to choose the optimal geometrical parameters of the satellite rollers 18.

To determine the optimal parameters, the following kinematic analysis of the rotor as a frictional mechanism of planetary type was carried out,

The frequency of rotation of the axes of the accelerator rollers 17 and satellite rollers 18

Sho-o)

Ri + R3 R3

where is the rotation frequency of the vertical drive shaft 7;

RI is the radius of the vertical installation of the axles 16;

Yaz is the radius of the satellite rollers 18. The linear velocity of the surface of the accelerator rollers 17 is

50

Y2-O2-M-3 3+ 3).

where R2 is the radius of the accelerator rollers 17,

The speed of movement of the material VM relative to the rotor 10 is unknown, but it is known that its average value is proportional to the linear velocity of the points of the rotor 10

VM ° KwRi,

where K is the proportionality coefficient.

As indicated, it is necessary that the linear velocity of the surface of the accelerator rollers 17 be equal to the speed of the material, i.e.

V2 vm5

(l)

.Rz (Ri + R3) R .z

 Kwri

Ogusuda-Ј - + - Ј-Ki4- K 1 1 °

Rz Ri

Ra R2 RI

Thus, the optimum radius R3 of the satellite rollers 18 is conveniently determined by the formula 15

/ К Л -i (Ж Ri /

R3

where the optimal values of the coefficient K are determined experimentally.

Thus, the resulting formula expresses the dependence of the optimal radius R3 of the satellite rollers 18, reducing wear on the accelerator rollers 17, on RI — the installation radius of the axes of the acceleration rollers 17, R2 — the radius of the acceleration rollers 17 and K, the coefficient depending on the magnitude of the relative speed of movement of the material when it enters the accelerator rollers 17, and, consequently, on the physicomechanical properties of the material being processed (the coefficients of heat in the acceleration channel 14, particle size, and so on) - which are determined by experiment experimentally.

To determine the optimal range of K coefficient values, a series of special experiments were carried out on a centrifugal impact crusher model with a rotor diameter of 500 mm. The angular velocity of rotation of the rotor 10 in experiments is 3000 rpm, which corresponds to a departure speed of 75 m / s. In the experiments, coke, fireclay and limestone are used as materials to be processed. A set of replaceable satellite rollers 18 and cylindrical shells 6 are made for the experiments. Radius of installation of vertical axes 16 of accelerator rollers 17 on the model is 200 mm, roller radius accelerators

°

five

0

50

0 5

17-60 mm. The radii of the replaceable satellite rollers 18 in the kit are 85. 70. 60, 50, 40, 35, 30, 20 and 15 mm, which corresponds to the values of the coefficient K in the calculation formula 1.00; 1.15; 1.30; 1.50; 1.80; 2.00; 2.25; 3.00 and 4.00. In each experiment, 200-300 kg of material is processed. The specific wear of the accelerator rollers 17 is determined.

The results of the experiments are shown in the table.

As can be seen from the data given in the table, the specific wear of the accelerator rollers is maximum at values of the coefficient K 1.5-2.5. This means that at K, the calculated radius of the satellite rollers ensures that the relative speed of the material and the linear speed of rotation of the accelerator rollers are equal or similar, which leads to a decrease in the wear of the latter. Therefore, the range of values of the coefficient K 1.5-2.5 is considered optimal. The use of the experimental results on the model in this case is justified, since the centrifugal impact crushers satisfy the conditions of geometric and kinematic similarity.

Claims (1)

Invention Formula A centrifugal impact crusher, comprising a housing with reflective surfaces, a vertical drive shaft with a rotor having accelerated channels and roller accelerators mounted on vertical axes, which, in order to improve the reliability of the crusher, is equipped with an upper parts of the body of a cylindrical shell and satellite rollers fixed on the axes of the accelerator rollers in contact with the inner surface of the cylindrical shell, and the radius Yaz of the satellite rollers is determined by the formula o / K eleven Рз () where R2 is the radius of the accelerator rollers, m; Ri — radius of installation of vertical axes of accelerator rollers, m; K 1.5-2.5. Aa 12 14