SU680757A1 - Two-rotor crusher - Google Patents

Description

54) DOUBLE CRUSHER

I

The invention relates to the crushing of materials.

The two-rotor crusher of the two-stage crushing with the kinematic connection of the rotors and the reflective device 1 is known. The kinematic connection is made in the form of a V-belt transmission.

However, when crushing abrasive materials such a two-rotor crusher has a short service life of the rotors.

This is explained by the fact that the material on the first rotor is fed in a continuous flow, as a result of which part of the pieces hits the extra surface hit or insufficiently penetrates into the working area and, perceived a sliding blow, is ineffectively crushed, while the external surface of the billet wears out intensively. .

On the second rotor, pieces of material, though supplied by the first rotor, are portioned, but due to the indefinite mutual angular position of the two rotors, caused by the slip of the V-belt transmission, similar to the first rotor, they are ineffectively crushed and wear out.

The purpose of the invention is to increase the efficiency of crushing and increase the service life of beats.

This is achieved by the fact that in a two-mills two-stage crusher with a kinematic link between the rotors and a baffle device, the kinematic link of the rotor is rigid, and the baffle device is provided with an additional plate installed parallel to the tangent from the center of rotation of the second rotor to the first circle.

FIG. 1 shows the scheme of the proposed crusher, cross section; in fig. 2 shows one of the variants of rigid kinematic coupling of rotors.

Claims (2)

The crusher includes a housing 1 in which rotors 2 and 3 are hinged. In the upper part of the housing 1 above the rotor 2 there is a reflecting device 4, which simultaneously performs the function of a receiving tray. In the lower part: an additional plate 5, which is parallel to the line, is installed in the reflecting device 4. The L-B is a tangent line drawn from the center of rotation of the second rotor 3 to the circumference of the first rotor 2. Above the second rotor 3 there are pivotally suspended reflective plates 6. Stiffness A kinematic link is provided, for example, by having a gear 7 on the rotor 2 shaft connected by a parasitic gear 8 to the gear 9 of the rotor 3. The gear ratio between the speed of the rotors of the rotors 3 and 2 should be expressed by the equation: , i Z, (K ± 4). (1) where: P and P2 - the number of rotations of the rotors Z | and Z2 is the number of beats of rotors 2 and 3; K is any integer selected when determining the sizes of rotor 2 and corresponding to the number of rotor rotations 3 per feed of one portion of material by rotor bilom 2. The limiting ratio of the peripheral speeds of the rotors must satisfy the condition: Jf ЗГ, -v, 3 () ( 2) where Vi and Va are the peripheral speeds of the rotors 2 and 3; bg - the ratio of the size of the maximum. a piece of raw material to the diameter of the rotor 3; V is the ratio of the thickness of the beat to the maximum size of a piece of the starting material. The relative angular position of the blows is determined by the angle tp measured in radians and counted from the vertical axis of the rotor 3 to one of its hits when one of the hits of the rotor 2 is on the vertical axis of the rotor 2 in the upper position "O. The angle vf is determined by the equation: H) 4.72 +2 (bg + t) -; S (i - 1) - i (ctg / J -25, -), (3) where t is the ratio of the thickness of the rotor 3k the diameter of the latter; 5 | - the ratio of the size of the maximum piece of the source material to the diameter of the rotor 2; - the ratio of the diameter of the rotor 3 to the diameter of the rotor 2; and arcsin, where DI is the diameter of the rotor 2; - distance between the axes of peacemakers. The observance of the condition expressed by equation (1) ensures that each portion of the material directed by the rotor 2 bar hits each gap between the rotor 3 beams. Observance of the conditions expressed by equations (2 and 3) ensures the optimal penetration of the pieces of material into the working zone of the rotor 3 Additional plate 5 limits the scatter of the pieces up from the line AB. In this crusher design, the main work is performed by the rotor 3, since the rotor 2 has a much lower speed and performs the function of a feeding device. Crusher works as follows. The material is continuously fed into the crusher inlet and falls under the blows of the rotor. 2. By striking this rotor, pieces of material are partially destroyed and in portions are thrown into the working area of the rotor 3, where the material is finally crushed. The proposed crusher design maximizes the number of effective hits on the stone and minimizes the wear of the external surface of the hits. In addition, the high rates of penetration of pieces of stone into the working area of the rotor 3 make it possible to increase the number of hits on it, which further increases the service life of the hit rotor and, in combination with reduced specific wear, the service life of the hits increases more than 5 times. Claims of the invention Two-rotor crusher of two-stage crushing with a kinematic connection of rotors and a reflective device, characterized in that, in order to increase the efficiency of crushing and increase the service life of the beater, the kinematic connection of the rotor is rigid, and the reflective device is equipped with an additional plate installed parallel to the tangent, drawn from the center of rotation of the second rotor to the circumference of the first. Sources of information taken into account during the examination 1. Bauman V. A. Impact crushers. M., “Mechanical Engineering, 1973, p. 100, fig. 566. FIG. 2