Squeezing roller and rotary drum-type magnetic separator

Abstract

This invention provides a rotary drum-type magnetic separator, which can satisfactorily squeeze a liquid contained in sludge without striking the sludge into the squeezing roller even when the sludge has such a shape that is likely to be striken into the squeezing roller, and a squeezing roller for use in the separator. The separator comprises a squeezing roller (6) which is abutted against a rotary drum (3) and is rotated about a shaft substantially parallel to the rotating shaft of the rotary drum (3). The rotary drum (3) has a built-in and fixed internal cylinder (5) on which a plurality of magnets (4), (4), are disposed. An external cylinder (9) formed of a nonmagnetic material is rotated on the circumference of the internal cylinder (5). An elastic body is disposed on the squeezing roller (6) in its face abutted against the rotary drum (3). The elastic body is formed of an uncrosslinked polyurethane material composed mainly of a polyester polyol. A suppressing member for suppressing the deformation of the elastic body is provided on both ends of the squeezing roller (6).

Description

technical field [0001] The present invention relates to a rotating drum type magnetic separation device for recovering fine residues (scratches) contained in cooling liquid, and a pressure roller used in the device. Background technique [0002] In the cutting and grinding of metal materials, especially magnetic materials such as iron and steel materials, cutting chips and chips discharged together with the coolant are separated from the liquid and recovered. Since chips, chips, etc. have various shapes, various magnetic separation (recovery) devices have been developed from the viewpoint of recovery efficiency. [0003] For example, since cut chips called residues are powdery, they tend to concentrate and contain liquid. Therefore, separation and recovery become difficult, so the magnetic separation device is required to have good fine residue liquid removal (liquid cutting sex) devices. [0004] As shown in Patent Document 1, in a conventional rotating drum type magnet...

AI Technical Summary

Problems solved by technology

[0008] However, in Patent Document 1, there is a problem that when the scraper 7 scrapes off the residue, the liquid on the surface of the rotating drum 3 is scraped together with the residue, and the collected residue is in a state containing liquid.

Especially at both ends of the pressure roller 6, the extrusion efficiency is relatively easy to decrease, and it is easy to become a state where the liquid is not fully squeezed out.

Therefore, there is also a problem that the liquid remaining at both ends is sucked by the residue again in the vicinity of the scraper 7, and the liquid removal of the separated residue becomes insufficient.

In addition, oil-based coolants with a higher viscosity than water are often used, and it has become increasingly difficult to reliably separate coolants from ultra-fine particles.

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