SU990291A1 - Method of adjusting inertial cone crusher - Google Patents

Description

(54) METHOD FOR SETTING THE INERTIONAL CONE

CRUSHERS

one

The invention relates to methods for adjusting an inertial crusher to an optimal mode for the brittle fracture of a metal pulverizer without plastic deformation of its grinding edges. It can be most useful and efficiently used in powder metallurgy, mainly for wasteless production of tool steel products.

When producing highly resistant products, for example, from high-speed steels, the mechanical mixture of the granules of the sprayed metal is subjected to extrusion, producing blanks of future parts, which are machined to produce chips. The latter, during remelting, burns out, which leads to the corresponding irretrievable loss of m. Cast billets of parts do not ensure uniform distribution of carbides throughout the part, therefore this method is gradually replaced by extrusion. However, the latter is also complex and leads to significant losses.

. The necessity of grinding is caused by the fact that the spherical granules of fineness

even smaller than BO microns, it is impossible to compress to a density close to absolute, even at a pressure of about 20 t / cm. However, if their dimensions are reduced to 10.0 µm, a pressing force of 7–8 t / cm is sufficient, although it is also considered to be very high for mass production. Particles of this size can be obtained only by the method of grinding, sprayed granules.

10 There is a known method of setting up a grinding apparatus for breaking high-speed steel granules. The method concerns the adjustment of the vibratory pellet mill to the optimal mode by selecting the number of oscillations, the amplitude of the hull and the time of 15 grinding. Since the time of continuous grinding of granules in such a mill reaches 48 hours to obtain 10 kg of powder smaller than 10 microns, the process is carried out in a neutral medium, for example in alcohol. Then the rial material is dried, mixed and pressed 1.

In the process of grinding, the granules are first broken up into plates, then turned into rounded spherical particles, since abrasion is predominant in these mills, which leads to the peeling of carbide particles from the main metal, which in turn causes a reduction in the durability of the products, the spherical shape of the particles requires pressing force up to 7 t / cm2 to achieve a density of 96-98% of absolute.

The closest to the invention to the technical essence is the method of setting up an inertial cone crusher, including the convergence of workers with the armor of its crushing cones and the adjustment of the force of interaction of cones developed by a driving vibrator.

The convergence of the working surfaces by armor is carried out as in all cone crushers to compensate for the wear of the armor. However, if in conventional crushers this is done to maintain optimum product size, then inertial discharge gap does not affect product size and is maintained as high as possible for maximum productivity but no more critical, at which it is no longer possible to ensure running in of the inner cone. external, i.e., it is not possible to effectively crush. Thus, to crush all known materials that are generally capable of destroying existing crushers, a discharge gap is always left between the working surfaces, for example, for a KID-300 crusher - 8 mm, for KMD-600 - 25 mm, for KID-1750 - 60 mm As applied to minerals, the strength of which is within the range of the Horse Horse mode, the known method provides for the adjustment of the centrifugal force of the drive unbalance, which is the main component of the crushing force. The force developed by the vibrator is a decisive factor for providing the inner cone with sufficient amplitude for intra-intracellular destruction of the material distributed over the entire height of the grinding cavity 2.

The inertial crusher in the known mode, like all existing crushing machines, is not capable of grinding metal granules. If conventional cone crushers are prone to breakage when metal enters their crushing cavity, then inertial crushers in a known mode are prone to seizure, although without accidental consequences.

Thus, the known method of setting up an inertial crusher is not suitable for grinding metal granules.

The aim of the invention is to crush metal granules without rolling and plastic deformation of their fragments.

This goal is achieved by the fact that according to the method of setting up an inertial cone crusher, including the convergence of workers by the armor of its crushing cones

And the adjustment of the force of interaction of the cones developed by the drive vibrator, the convergence of the cones is carried out before the working surfaces contact them with armor, and the force of the interaction of the cones developed by the vibrator is established in accordance with the dependence

F (0,, 25) S S,

where F is the force of interaction of cones, kg; 61 tensile strength of granules, kg / mm; S is the area of the longitudinal section of the working part of the inner cone, mm;

t is the distance from the center of the spherical support of the inner cone to

the horizontal plane on which the center of the body of the unbalanced vibrator weight is located, mm;

d is the distance from the center of the spherical support of the xnus to the lower edge of the working surface of its armor, mm.

Armor of cones after machining always have ellipticity and non-centricity, which, with a point or close linear contact, cones maintains a gap between them in the discharge zone, although the gap is not circular in this case.

However, this gap is sufficient to provide an initial oscillation of the cone within its limits. The vertical component of the crushing leads to elastic deformation of the diaphragm of the spherical support, which leads to the formation of already 5 circular, pulsating gap in the operating mode. When the crusher is stopped, the gap between the cones in the zones of nonconcentricity and ellipticity is completely absent. The magnitude of the pulsating gap is one hundredth of a millimeter and is 0 calibrating to obtain a finished powder of the desired size.

Since the initial granules have an average particle size of about 200 microns, their destruction occurs only in the lower part of the crushing cavity. Therefore, the adjustment of the force developed by the vibrator must be made on the basis of its reduction to the lower edge of the crushing inner cone, taking into account the tensile strength of the ground granules.

 The results of processing numerous experiments on setting up the crusher for grinding granules allowed us to establish the empirical dependence of the necessary centrifugal force of the vibrator on the geometric

crusher parameters and the strength of the crushed metal. The deviation of the values of the force F (0.1–0.25) depends on the physicomechanical properties of the metal granules, that is, on the impact strength, degree of hardening

Claims (1)

Claim A method for adjusting an inertial cone crusher, which includes converging the $ 2 working armor of its crushing cones and adjusting the interaction force of the cones developed by the drive vibrator, characterized in that, in order to crush the metal granules without rolling and plastic deformation of their fragments, the cones are brought together before contact of the working surfaces their armor, and the interaction force of the cones developed by the vibrator is set in accordance with the relation ₃₅ F = (0.1-0.25) [61 Si where F / is the force of interaction of the cones, kg; [6] is the tensile strength of the granules, kg / mm ² ; S is the longitudinal sectional area of the working part of the inner cone, mm; 40 L is the distance from the center of the spherical support of the inner cone to the horizontal plane on which the center of gravity of the unbalanced load of the vibrator, mm; ⁴⁵ d is the distance from the center of the spherical support of the cone to the lower edge of the working surface of its armor, mm