Metal bar high speed rotary feeding device

Abstract

The invention provides a high rotating speed rotary feeding device for a metal rod. One end of a metal rod sealing cabin is connected with an atomizing chamber; the other end of the metal rod sealing cabin sleeves the periphery of a power transmission sealing cabin and the other end of the metal rod sealing cabin is connected with the power transmission sealing cabin through reciprocating dynamic seal; one end of a rotary power transmission shaft supports the end portion of the power transmission sealing cabin through a rolling bearing I and extends inside the metal rod sealing cabin to be fixedly connected with one end of the metal rod; the other end of the metal rod supports one end portion of the metal rod sealing cabin through a rolling bearing II and extends into the atomizing chamber; the other end of the rotary power transmission shaft is in dynamic connection with the other end portion on one side of the power transmission sealing cabin in a sealing mode through rotary dynamic sealing and is fixedly connected with one end of a coupler; the other end of the coupler is connected with an electric spindle; an output shaft of a feeding motor is connected with one end of a screw rod; the screw rod is matched with a nut to drive the electric spindle and the power transmission sealing cabin to perform horizontal feeding. A separated single dynamic sealing structure can guarantee the good sealing effect of a movement component and a static component and can easily achieve high movement speed of the movement component.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a high-speed rotary feeding device for metal rods necessary for plasma rotary electrode atomization powder making equipment. Background technique [0002] Plasma rotating electrode atomization powder making technology is one of the important technologies for preparing high-quality spherical metal powder, especially high-activity metal powder. The characteristic of this powder making technology is that the metal bar is sent into a vacuum or an atomization chamber filled with a certain inert gas at a high speed (generally up to 10,000 rpm), and then the front end of the metal bar is melted with a plasma arc, and the front end of the bar is melted. Metal droplets are crushed and thrown out by the centrifugal force generated at high speed, and then spheroidized by surface tension to condense into spherical powder. The metal powder prepared by this technology ha...

AI Technical Summary

Problems solved by technology

A key part of this technical equipment is the dynamic sealing structure between the metal bar material entering the atomization chamber. Since the bar material rotates at high speed and has an axial linear feed movement into the atomization chamber, the bar material and the atomization chamber The seal between them includes a rotary dynamic seal and a reciprocating dynamic seal. The sealing structure is complex. If the seal is not good, it will cause the vacuum of the atomization chamber or the inert gas to leak, destroy the atomization atmosphere, and contaminate the prepared active metal powder.

A single rotary dynamic seal can achieve a rotation speed of 30,000 rpm under the condition of ensuring good sealing. However, when the rotating component includes reciprocating motion, the complexity of the dynamic seal structure will increase exponentially. Due to the relevant technical conditions In order to ensure the sealing between the relative moving parts, the speed of the moving parts has to be greatly reduced. At present, the maximum rotating speed of the metal bar of this equipment is 15,000-18,000 rpm, which cannot exceed 20,000 rpm.

Since the rotating speed cannot be further increased, the particle size of the spherical metal powder prepared by the current plasma rotating electrode powder making equipment is generally relatively coarse. For example, the prepared titanium alloy powder, most of the powder particle size is between -60 and +150 mesh, and -200 mesh powder almost no

Due to the limitation of the dynamic sealing structure between the metal bar and the atomization chamber, the rotational speed of the metal bar cannot be further increased, and the molten droplet cannot be provided with greater centrifugal force to break and atomize the molten metal droplet, so it is impossible to prepare a finer particle size powder. an important factor, so it is necessary to improve the

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