RU2082505C1 - Device for separation of ferromagnetic inclusions from flow of splints - Google Patents

Abstract

FIELD: operation of plants producing matches; applicable in cleaning of splints from ferromagnetic inclusions. SUBSTANCE: the offered device includes conveyer made in form of magnetic appliance rotating together with tail pulley of conveyer. Magnetic appliance has magnets arranged in several lines over the width of conveyer belt on the pulley internal surface with periodically reversed polarity, and embraced by electromagnetic strip. The device is provided with fixed magnetic appliances located over the path of motion of splints. Permanent magnets of magnetic appliance are arranged in several lines with periodically reversed polarity and embraced by ferromagnetic steel strip. Permanent magnets may be circular in cross-section and spaced relative to one another at a distance equalling not more than one diameter of magnet. Lines in which magnets are arranged are spaced relative to one another at a distance equalling diameter of permanent magnet. Conveyer belt is used as cleaning device. Tail pulley is made of nonmagnetic material. Polarity of permanent magnets between lines is constantly reversed. EFFECT: higher efficiency. 6 cl, 3 dwg

Description

 The invention relates to the operation of match factories, where conveyor lines, conveyors are systematically clogged when worn by ferromagnetic inclusions. The latter clog holes in the cassettes of match stick rails, which leads to a decrease in line productivity, to emergency situations that require a long time to eliminate them.

 A device for separating ferromagnetic inclusions [1] including a conveyor and a magnetic catcher, made in the form of a magnetic device rotating together with a driven drum conveyor and a stationary magnetic device located in the direction of flow.

 However, the use of the known device does not allow to effectively separate the ferromagnetic inclusions through the conveyor drum, since the magnetic field is significantly reduced by the thickness of the steel surface of the drum.

The closest technical solution is a magnetic separator using magnets to search and extract ferromagnetic inclusions [2]
However, structurally, it cannot be used for flows and conveyors of match materials.

 In order to improve the quality of separation of ferromagnetic inclusions from a match straw stream transported by a conveyor, a special device has been developed.

 In FIG. 1 shows a device for separating ferromagnetic inclusions from a match straw stream; in FIG. 2 arrangement of permanent (blackened) magnets staggered on the inner surface of the conveyor drum; in FIG. 3, section AA in FIG. 2.

 The device includes a conveyor belt 1 of a conveyor with a match straw 2, running around the driven drum 3. On the inner surface of the drum is mounted a magnetic device 4 rotating together with the driven drum 3 of the conveyor, magnets 5 of which are arranged in several lines along the width of the conveyor belt on the inner surface of the drum with periodically changing polarity and covered by a ferromagnetic strip 6. The device is equipped with a fixed magnetic device 7 located along the direction of the match straw, Permanent magnets 8 of which are arranged in several lines with periodically changing polarity, are covered by a ferromagnetic steel strip and enclosed in a protective casing 9. The distance between the lines on which the magnets are located and also between the magnets in the same line is determined by the ratio l = d, where d is the outer diameter or the width of the permanent magnets 5 and 8.

 The driven drum 3 is made of stainless steel. Permanent magnets are located on the inner surface of the conveyor drum in such a way as to reduce the dip of magnetic forces and to equalize the magnetic field of the moving surface of the drum, i.e. in a checkerboard pattern (Fig. 2 view of the inner surface of the drum 3 with magnets 5). The location and distance between the magnets here should be no more than the diameter of the round or the width of the permanent magnets.

 The device operates as follows.

 The match straw stream 2 moves along the conveyor with conveyor belt 1. With the inner part of the drum 3, the permanent magnets 5 are mounted through a step l = d, where d is the outer diameter or width of the permanent magnet. Ferromagnetic inclusions (nails, bolts, nuts, studs, pieces of metal, etc.) are attracted by the driven drum and carried by the stream, and then fall under the conveyor, separated by conveyor belt as they exit the zone of attraction of permanent magnets and fall into the drive.

 To clean the flow from the upper surface, a fixed magnetic device 7 is installed, also consisting of permanent magnets 8 closed in an airtight protective casing 9. Magnets 8 are located in one or more lines. It is then periodically cleaned of accumulations of ferromagnetic switches.

 Using the proposed device allows, without reducing the flow rate and line productivity, to separate ferromagnetic inclusions from the stream of match materials.

 In addition to match production, it can find application in technological flows of wood flour production, food industry and in other industries.

Claims (6)

 1. A device for separating ferromagnetic inclusions from a stream of match straws, including a conveyor, made in the form of a magnetic device rotating together with a driven drum of a conveyor, magnets of which are arranged in several lines along the width of the conveyor belt on the inner surface of the drum with periodically changing polarity and covered by a ferromagnetic strip, characterized in that it is equipped with a fixed magnetic device located along the flow of the match straw, constant whose magnets are arranged in several lines with periodically changing polarity and are covered by a ferromagnetic steel strip.  2. The device according to p. 1, characterized in that the permanent magnets are made round in cross section and are located relative to each other at a distance of not more than one diameter of the magnet.  3. The device according to paragraphs. 1 and 2, characterized in that the line of permanent magnets along the inner surface of the driven drum are at a distance relative to each other, equal to the diameter of the permanent magnet.  4. The device according to claim 1, characterized in that the conveyor belt of the conveyor is used as a treatment device for separating ferromagnetic inclusions.  5. The device according to claim 1, characterized in that the driven drum is made of non-magnetic material.  6. The device according to p. 1, characterized in that the polarity of the permanent magnets between the lines periodically changes.

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