RU2108159C1 - Centrifugal crusher with inner recycling - Google Patents

Abstract

FIELD: agricultural and other industries. SUBSTANCE: crusher includes housing where rotor is mounted on vertical shaft. Rotor is made in form of impeller of centrifugal double-suction fan divided into two parts by spreading disk with spreading blades on its upper and lower surfaces. Rotor and circular knockout deck plates secured on housing and taper screen provided with bottom and suction branch pipe form two-circuit crushing chamber at ratio of flow rates through inner and outer circuits more than one. Inlet of crushing chamber may be provided with taper working members with calibrated space between them in their lower portion. Part of rotor entering the recycling circuit may be provided with additional members. EFFECT: enhanced reliability. 3 cl, 2 dwg

Description

 The invention relates to devices for crushing materials, namely to centrifugal impact crushers, and can be applied in agricultural and other industries.

 Known centrifugal multistage crusher [1], containing several stages of grinding, located sequentially on a vertical axis in one housing. Each grinding stage contains, in addition to the centrifugal type working body, the diameter of which increases along the course of the product, a baffle deck, a pitched board, and a mechanical classifier.

 The closest in technical essence to the invention is a centrifugal crusher with an internal spike containing a housing in which a rotor, baffle decks and sieve are installed on a vertical shaft [2].

 The disadvantage of the crusher is the high material and energy intensity of the crushing process.

 The objective of the invention is to reduce the material and energy consumption of the grinding process, ensuring a normalized supply of raw materials and obtaining a product of a given size.

 The above technical results are achieved by the fact that in a centrifugal crusher with an internal recycle containing a housing in which a rotor, baffle decks and sieve are mounted on a vertical shaft, the rotor is made in the form of an impeller of a double-suction centrifugal fan with an accelerating disk, on the upper and lower surfaces of which booster blades are installed, while the rotor together with the casing, circular decks, conical sieve with bottom and suction pipe form a double-circuit crushing chamber, and the ratio p there are more than 1 waste of crushed material through internal and external contours.

 The entrance to the crushing chamber can be equipped with conical working elements with calibrated spaces between them in their lower part. A part of the rotor included in the recycle circuit may be provided with additional organs, for example, hammers.

 In FIG. 1 shows a centrifugal crusher with internal recycling; in FIG. 2 - crusher rotor with hammer grinding working bodies.

 The centrifugal crusher with internal recycling (Fig. 1) consists of a housing 1 with a cover 2 and a base 3.

 Inside the housing, a rotor 4 is mounted on a vertical shaft, made in the form of an impeller of a double-suction centrifugal fan, divided into two parts by an accelerating disk 5, on the upper and lower surfaces of which accelerating blades 6 and 7 are installed.

 On the perimeter of the upper and lower parts of the rotor at a certain distance installed circular fenders 8 and 9.

 A conical sieve with a bottom 10, a suction pipe 11 and a conical reflector 12 are attached to the base of the housing.

 The rotor together with the casing, circular decks and the grill forms a double-circuit grinding chamber in which two product flows are formed: one - the initial flow, the second - intermediate, passing through the external (consumable) circuit and the internal - recycle circuit, with the ratio of the product costs through the internal and external contours greater than 1.

 For a normalized supply of the initial product, the entrance to the crushing chamber is equipped with conical working elements, in which the outer cone 13 is fixed and the inner 14 is movable. The outer 13 and inner 14 cones in the lower part form a calibrated space. The lower part of the rotor along the outer perimeter may have pivotally attached additional crushing working bodies - hammers 16 (Fig. 2).

 The proposed crusher works as follows.

 The initial product to be crushed enters the space between the conical working elements 13 and 14. Large particles, the size of which exceeds the passage section, are preliminarily crushed by the surfaces of the cones. Due to the calibrated space between the cones, the initial product is fed normalized into the upper part of the rotor, where the accelerating disk 5 and the blades 6, under the action of centrifugal force, give the particles of the initial product the necessary speed. As a result of the impact on deck 8, the particles of the initial product are destroyed and along a helical trajectory they continue to move along the surface of the sieve 10. In the process of moving along the sieve, the finished product is separated, and the remaining unfinished part of the product flows to the bottom of the sieve, is sucked into the bottom through the suction pipe parts of the rotor and is fed by accelerating blades 7 for re-crushing by impact on deck 9 and sieving on the sieve 10. The number of cycles of re-crushing (recycling) is such that t total destruction of the starting material to the desired particle size.

The effectiveness of the proposed device is characterized
normalized supply of the original product, excluding the use of load regulators;
obtaining a homogeneous granulometric composition of the finished product, with the exception of regrinding and undergrinding;
reduction in energy intensity of the process of destruction of particles;
a decrease in the specific metal and capital intensity of the process.

Claims (3)

 1. Centrifugal crusher with internal recycling, comprising a housing in which a rotor, baffle decks and sieve are mounted on a vertical shaft, characterized in that the rotor is made in the form of an impeller of a double-suction centrifugal fan with an accelerating disk, on which upper and lower surfaces are installed blades, while the rotor together with the casing, circular decks, conical sieve with bottom and suction pipe form a double-circuit crushing chamber, and the ratio of the costs of the crushed material is black Without internal and external circuits greater than 1.  2. The crusher according to claim 1, characterized in that the entrance to the crushing chamber is equipped with conical working elements, in which the outer cone is stationary and the inner cone is movable to form a calibrated space between themselves in the lower part.  3. The crusher according to claim 1, characterized in that the part of the rotor included in the recycling circuit is equipped with additional crushing working bodies, for example, hammers.

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