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INVENTION
Patent of the Russian Federation RU2132233
ROLLER SHREDDER
The name of the inventor: Morozov Yu.P. Afanasyev AI; Timofeev N.I .; Ermakov AV; Bogdanov VI; A.Osintsev; Kraev V.V.
The name of the patent holder: Open Joint-Stock Company Ekaterinburg Non-Ferrous Metals Processing Plant
Address for correspondence: 620014, Ekaterinburg, Lenina 8, JSC "EZOTSM"
Date of commencement of the patent: 1997.10.20
The device is intended for crushing and grinding of various materials. The roller shredder consists of a conical driving and driven rolls mounted in bearing assemblies. The bearing assemblies of the drive roll are rigidly fixed to the frame, and the bearing assemblies of the driven roll are mounted to be movable relative to the frame by deformation of the springs. On the roll shaft on the bearings there are two eccentric pulleys driven by the V-belt drive from the engine. Rolls are installed so that the tops of their cones are directed in opposite directions. The mass of eccentrics and the total mass of pulleys with eccentrics, a driven roll with bearings are related by dependencies. The invention makes it possible to improve the efficiency of the grinding process and the productivity.
DESCRIPTION OF THE INVENTION
The invention relates to the technique of crushing and grinding various materials and can be used in non-ferrous and ferrous metallurgy in the grinding of ores and wastes containing precious metals, but also in the chemical, food and other industries.
A roll crusher is known, consisting of a stationary and movable rolls with perforated working surfaces filled with balls mounted in bearings on shafts, a fork bracket mounted on the frame and interacting with the roll of a movable roller and drive (USSR USSR N 1014581, MKI B 02 C 4/28, published on 04/04/83).
However, such a grinder has a low grinding efficiency, because Crushing is carried out only by crushing by rollers.
The closest to the proposed technical solution is a roller mill comprising a leading and driven rolls installed in roller bearings made of a conical shape, large bases of which are directed in opposite directions, and a drive (USSR USSR N 354886, MCI B 02 C 4 / 30, published on 16.10.72).
In spite of the fact that the conical shape of the outer surface of the rolls increases the path of movement of the crushed product particles, however, the known roller mill is characterized by a low grinding efficiency which occurs by abrasion and crushing of the product.
The task underlying the claimed technical solution is to increase the efficiency of the grinding process.
The problem is solved as follows. In a roller shredder comprising a guide and driven cone-shaped rollers mounted on the frame in the bearings, the large bases of which are directed in opposite directions, and the drive, according to the proposed technical solution, two pulleys with eccentrics equipped with a drive connected to Each pulley by means of a transfer with flexible coupling, the driven roll being made spring-loaded, and the mass of the eccentrics and the total mass of the pulleys with eccentrics, the driven roll with the bearings are determined by the following dependencies: 
Where m e is the mass of eccentrics, kg; 
- speed of pulley rotation with eccentric, rad / s;
E - eccentricity, m;
C - total spring stiffness, N / m;
X o - preliminary deformation of springs, m;
M c - total mass of pulleys with eccentrics, driven roll with bearings, kg.
The listed set of features allows, in comparison with the prototype, to increase the efficiency of the grinding process due to the fact that the material is crushed by abrasion, crushing and impact.
If these dependences are not observed, the grinding changes to a resonant regime, in which the abrasive effect sharply decreases, and the operation of the crusher passes into the region of resonant grinding, as a result of which the efficiency of grinding sharply decreases.
The presence of essential features that are distinct from the prototype allows us to recognize the claimed technical solution as new.
The essence of the claimed technical solution for specialists does not explicitly follow from the state of the art, which makes it possible to conclude that it corresponds to the "inventive step" criterion.
The possibility of using the claimed invention in industry makes it possible to conclude that it conforms to the criterion of "industrial applicability".
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In Fig. 1 schematically shows a roller shredder, top view; In Fig. 2 is a view A of Fig. 1.
The roller shredder consists of a conical driving roller 1 and a conical driven roller 2 mounted in the bearing assemblies 3 and 4, respectively. The bearing assemblies 3 of the drive roll 1 are fixedly fixed to the frame 5 and the bearing assemblies 4 of the driven roll 2 are movably mounted with respect to the frame 5 for The deformation of the springs 6. On the shaft of the driven roll 2, two pulleys are mounted on the bearings-an eccentric 7 driven by a V-belt drive 8 from the motor 9. The drive roll 1 is driven by the V-belt drive 11 from the motor 10. The grinding material is fed to Rolls 1 and 2 from the hopper 12. The rolls 1 and 2 are mounted in such a way that the apexes of their cones are directed in opposite directions.
The shredder works as follows.
The motor 10 drives the driving roller 1, which, in contact with the roller 2, rotates it. Due to the conicity of rolls 1 and 2, rolling is observed only in one section, and in the other sections slip occurs at different speeds. The motor 9 drives the eccentric pulleys by means of a V-belt drive 8. The resulting centrifugal force causes the driven roll 2 to oscillate with the bearing assemblies 4 and the eccentric pulleys 7 on the springs 6.
The stiffness of the spring 6 and its deformation are chosen so that the frequency of the natural oscillations of the system is 30% higher than the speed of the eccentric pulleys 7, which will allow the unit to operate in the pre-resonance mode and to regulate the frequency of impacts; The value of the centrifugal force must be greater than the preliminary force of compression of the spring 6, which will ensure a short-time divergence of the rolls 1 and 2 and the subsequent collision; The speed of the eccentric pulleys 7 must be greater than the speed of rotation of the driving roller 1, so that in the one revolution of the rolls 1 and 2 the latter will produce several impacts.
Using the proposed technical solution will improve the efficiency of grinding, and hence the productivity of the plant.
CLAIM
A roller shredder comprising a guide and driven cone-shaped rollers mounted on the frame in the bearings, the large bases of which are directed in opposite directions, and the drive, characterized in that two pulleys with eccentrics are provided at the ends of the shaft of the driven roll, provided with a drive connected to each Pulley by means of a transfer with flexible coupling, the driven roll being made spring-loaded, and the mass of the eccentrics and the total mass of pulleys with eccentrics, the driven roll with bearings are determined by the following dependencies:
M e · 2 · E> cx 0 ; 
Where m e is the mass of eccentrics, kg; - speed of pulley rotation with eccentric, rad / s;
Y - eccentricity, m;
C - total spring stiffness, N / m;
X 0 - preliminary deformation of springs, m;
M с - total mass of pulleys with eccentrics, driven roll with bearings, kg.
print version
Date of publication 14.03.2007gg
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