External heat tank type vacuum carburizing furnace

Abstract

Provided is an external-heat vacuum cementation furnace of tank type, which belongs to the field of heat treatment industry, in particular to an external-heat vacuum furnace with a muffle tank to heat. To resolve the pollution problem of carburization of a heating chamber, the carburization cella of the device is designed to be a sealing structure, the muffle tank body is firstly vacuumized before carburizing gas is charged in, and then the carburizing gas is charged in to carry on diffusion carburization, as the muffle tank is of sealed type, the heating system of the heating chamber can not be polluted, and the heating chamber can not be damaged. The device is in a bottom feeding vertical structure, the furnace body is in a double-walled water-cooling structure, the upper portion is a heating carburization chamber, the lower portion is a high-pressure air quenching chamber which is provided with a hydro cylinder, work pieces can be directly conveyed into the muffle tank to be heated and the muffle tank can be sealed by the hydro cylinder, when the heating carburization is completed, the hydro cylinder drops down and gets into a quenching area, then the high pressure positive blower is charged and starts to quench. Simultaneously, a middle gate locking plate valve is closed and the heating chamber can be continuously kept in a high temperature state, which brings heat energy and efficacy to secondary operation. The device is composed of a water-cooling furnace wall, a heating chamber, a muffle tank, an air charging system, a vacuum-pumping system, a high pressure positive blower, a heat interchanger, a feeding structure, and the like.

Description

technical field [0001] The invention belongs to the field of heat treatment industry, in particular to an externally heated vacuum furnace with muffle tank heating. Background technique [0002] Most of the current vacuum carburizing furnaces are refitted on the basis of the original vacuum furnace with an inflatable system. Because a large amount of carbon black will be produced during the carburizing process, it will often pollute the entire heating chamber and heating elements. Since the furnace shell is a double-walled water-cooled structure, there is often tar condensed on the inner wall of the furnace shell, polluting the entire furnace body, affecting Quality of products. Contents of the invention [0003] In order to solve the pollution problem of the heating chamber, the carburizing inner hall of the equipment is designed as a closed structure. The Fu tank is airtight, so it will not pollute the heating system of the heating room. It will not affect the damage ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the pollution problem of the heating chamber, the carburizing inner hall of the equipment is designed as a closed structure. Fu tank is airtight, so it will not pollute the heating system of the heating room