RU2768644C1 - Powder magnetic material cladding device - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, particularly, to powder cladding devices. It can be used in production of fine powders of core-shell format. Magnetic powder cladding device, comprising a reactor made in the form of a first and a second sealed chambers interconnected by a transition insert, pipelines for input and output of reaction products, agitator and reciprocating cylinder made of non-magnetic material. Said cylinder is divided by a rim into equal parts, one of which is placed in the reactor, and the second protrudes beyond the reactor. Part of the cylinder placed in the reactor is equipped with a permanent magnet installed inside it with the possibility of performing reciprocal and rotational movements. Part of the cylinder extending beyond the reactor comprises a bearing assembly, a rim and a rod secured therein and coupled with a drive for reciprocation. Agitator is located in the lower part of the first sealed chamber.

EFFECT: higher uniformity of coating.

1 cl, 1 dwg

Description

The invention relates to powder metallurgy, in particular, to devices for cladding powder materials, and can be used in metallurgy in the production of fine powders of the "core-shell" format.

A device for coating powder materials (Pat. 139352) is known, containing a vacuum chamber with a pumping system, a particle flow generator of the sprayed coating material located in it, directed from top to bottom, and a vibratory mixer-powder holder installed under it, made in the form of a cylindrical bowl , a conductive flexible shaft connected to the rotation drive and a reference voltage source, while the vibromixer-powder holder is kinematically connected to the rotation drive by means of a conductive flexible shaft, mounted on a platform that ensures its installation at an angle equal to 0-45 ° relative to the vertical axis, and made in the form of a cylindrical bowl with a conical bottom, equipped with blades with protrusions, at the base of which there is a gear wheel, to the teeth of which a cam is pressed by means of springs, while a heater and a pipeline with a nozzle are installed on the side wall of the vacuum chamber, connected to the blades of the vibratory mixer-holderpowder.

In the proposed solution, the aggregation of particles during mixing and the formation of agglomerates leads to uneven coating of powder materials.

A developing device is known (Pat. 2501058) containing a developer-carrying element for transferring a developer containing a magnetic carrier and a non-magnetic toner, and for developing an electrostatic latent image formed on the image-carrying element; a magnet provided in said developer bearing member and including a plurality of magnetic poles arranged along a circumferential direction of said developer bearing member for carrying the developer on said developer bearing member; and a control member provided opposite said developer-carrying member with a predetermined spacing in a region in which polarity-different magnetic poles are adjacent to each other to control the amount of developer carried on said developer-carrying member, wherein the magnetic poles are positioned such that the component the circular direction of the magnetic force acting on the magnetic carrier in contact with at least part of the upstream control surface of said control element relative to the circular direction of rotation of said developer-carrying element is opposite to the circular direction of rotation.

The proposed device is aimed at creating a thin layer of powdered magnetic material for developing a latent image.

The closest to the claimed technical solution is a method of metallization of powders and microspheres from the gas phase and a device for its implementation (Pat. 2307004), in which a device for metallization of powders from the gas phase, containing a reactor made in the form of two sealed chambers connected by a transition insert, and mounted on support shafts for rotation, a heater and pipelines for introducing gas volatile compounds and removing reaction products and carrier gas from the reaction zone, each chamber is made in the form of a truncated cone and connected to the transition insert by a smaller base of the cone, while each chamber is additionally equipped with a stirrer installed at the outlet of the chamber, the transition insert is connected to pipelines and is made in the form of a divider with a conical surface and a cross section that increases towards the junction with pipelines, moreover, pipelines for introducing gas volatile compounds and removing reaction products and carrier gas from the reaction zone are both support shafts.

In the proposed solution, the aggregation of particles in the process of pouring from chamber to chamber and the formation of conglomerates leads to uneven coating of powder materials.

The objective of the invention is to expand the range of devices for cladding magnetic powder material.

The technical result, to which the invention is directed, is to increase the uniformity of coating on a fine powder magnetic material with fixing the coating using the magnetic force of a permanent magnet.

The technical result is achieved by the fact that the device for cladding powder magnetic material includes a reactor made in the form of two sealed chambers connected to each other by an adapter, pipelines for input and output of reaction products and a stirrer, while the reactor is additionally equipped with a reversible - translational movements of a cylinder made of non-magnetic material, divided by a rim into equal parts, one part is placed in the reactor and equipped with a permanent magnet with the ability to perform reciprocating and rotational movements, and the second part protrudes beyond the reactor and contains a rod fixed in the bearing assembly and the rim, communicated with an additional drive, and the agitator is located in the lower part of the first sealed chamber.

Additional arrangement of a cylinder made of non-magnetic material and divided by a rim into equal parts, in which one part is placed in the reactor and equipped with a permanent magnet with a diametrical direction of the magnetic field, makes it possible to attract a thin layer of a mixture of powdered magnetic material with a cladding shell over the surface of the cylinder. At the same time, the agitator located in the lower part of the first sealed chamber makes it possible to prevent the process of caking and the formation of agglomerates of particles of a mixture of powder magnetic material and a clad shell, and also ensures the distribution of a mixture of powder magnetic material with a clad shell over the surface of the cylinder. This even distribution of the mixture, in turn, makes it possible to apply a uniform coating on the powder material during the cladding process.

Due to the implementation of a permanent magnet with the possibility of rotation in the process of rolling the fine magnetic powder over the surface of the cylinder, a uniform coating is applied with fixation by means of a magnetic force of attraction.

The presence of a permanent magnet also makes it possible to prevent the process of sticking of the magnetic powder to the walls of the reaction zone, maintaining the required component ratio of the mixture, which also ensures the uniformity of the applied coating.

The essence of the proposed device is illustrated by a drawing, which shows:

In FIG. 1 - Device for cladding powder magnetic material.

The device consists of a reactor 1 made in the form of two sealed chambers 2 and 3 and interconnected by an adapter insert 4. In the first sealed chamber 2, a pipeline for introducing reaction products 5 is located in its upper part, and a stirrer 6 is located in the lower part. chamber 3 there is a pipeline for the withdrawal of reaction products 7. In the reactor 1, a reciprocating cylinder 8 is installed, divided into two equal parts by a rim 9, with a rail 10 fixed on its surface. Cylinder 8 is kinematically connected to the main drive 11, providing reciprocating movement along the support rollers 12. One part of the cylinder 8, located inside the reactor 1, is equipped with a permanent magnet 13, kinematically connected with an additional drive 14 through the rod 15, providing reciprocating movement, while the permanent magnet 13 is connected to the rod 15 through rim 9 and bearing 16. Permanent magnet 13 is also installed It is mounted on the axis 17 and is kinematically connected with the auxiliary drive 18, which provides the possibility of rotation along the axis of the permanent magnet 13.

The device works as follows:

In the first sealed chamber 2 of the reactor 1, a powder mixture is loaded through the pipeline for introducing reaction products 5 to the level of the transition insert 4. Due to the auxiliary drive 18, axial rotation is transmitted to the permanent magnet 13. Due to the rotation of the permanent magnet 13 inside the cylinder 8 under the action of the magnetic field lines, a thin layer of coated magnetic powder particles are entrained by the magnetic field, forming a uniform layer of particles on the cylinder 8. Since the initial powder material is a mixture of particles of the core and the clad shell, the shell due to the mechanical rolling of the particles, it begins to be fixed on the surface of the core of the clad material. Due to repeated rolling, as well as rotation of the particles along an axis perpendicular to the rolling axis, the core particle is clad with a shell over the entire volume, forming a uniform coating. At the same time, a stirrer 6 operates in the lower part of the sealed chamber 2, which ensures the uniformity of the mixture of powder magnetic material and coating in the chamber for cladding powder magnetic material 2 and distributes the mixture of powder magnetic material and coating along the cylinder 8, and also prevents the formation of particle agglomerates. Upon completion of the cladding process, the rotation of the permanent magnet 13 stops.

In this case, the plated particles remain on the surface of the cylinder 8. Due to the mechanical transmission from the main drive 11 and the rail 10 and the mechanical transmission from the additional drive 14, the rod 15, the bearing 16 and the rim 9, the cylinder 8 and the permanent magnet 12 are simultaneously removed from the sealed chamber 2 of the reactor one.

After the withdrawal of the cylinder 8 from the chamber 2, the cylinder 8 stops. The movement of the permanent magnet 13 continues until the complete withdrawal from the sealed chamber 3 of the reactor 1. When the permanent magnet 13 is withdrawn from the sealed chamber 3, the plated particles fall off the surface of the cylinder 8 and are removed through the pipeline to remove the reaction products 7.

Next, the cylinder 8 is returned to its original position due to the mechanical transmission from the main drive 11 and the rail 10, guiding the cylinder 8 with the help of rollers 12. The permanent magnet 13 is also returned to its original position due to the mechanical transmission from the additional drive 14, the rod 15, the bearing 16 and rim 9 until landing on the axle 17. The process is repeated.

Claims (1)

A device for cladding magnetic powder, containing a reactor made in the form of first and second sealed chambers interconnected by an adapter, pipelines for input and output of reaction products and a stirrer, characterized in that it additionally contains a reciprocating cylinder from a non-magnetic material, divided by a rim into equal parts, one of which is placed in the reactor, and the second protrudes beyond the reactor, while the part of the cylinder located in the reactor is equipped with a permanent magnet installed inside it with the possibility of performing reciprocating and rotational movements, protruding beyond outside the reactor, part of the cylinder contains a bearing assembly, a rim and a rod fixed therein, connected with the drive, to provide reciprocating movements, and the agitator is located in the lower part of the first sealed chamber.

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