Large-sized vacuum hotpressing stove

Abstract

The present invention relates to a large vacuum hot pressing furnace, which comprises an electric furnace main body. The electric furnace main body comprises a furnace casing, a furnace casing bottomelevating device and an induced heating device; the furnace casing bottom elevating device comprises a material loading elevating platform, an electrical motor, three plane guideposts supported on thebottom part of the material loading elevating platform, and two adjusting screw rods driven by the same electrical motor; the induced heating device comprises an inductor and a furnace lining; a fire-resisting heat-insulating layer and an electric insulation later are arranged around the furnace lining structure arranged between the induction coil and the graphite heating cylinder of the inductor. The vacuum hot pressing furnace can make the material feeding and discharging process more safe and reliable, and meets requirements of the vacuum sealing performance and improves the planeness ofthe material loading elevating platform evidently. The adaptation of the induction heating method can make the temperature-rising speed improved significantly, and because the heating element is a graphite susceptor cylinder, which has strong intensity under high temperature, even if the graphite mold breaks under the pressing condition, the heating element can not be damaged.

Description

technical field [0001] The invention relates to the sintering of ceramic materials, and relates to equipment for heating and sintering ceramic materials in a vacuum or protective atmosphere, in particular to a large-scale vacuum hot-press furnace. Background technique [0002] The medium frequency induction vacuum hot pressing furnace belongs to the electric furnace with periodic operation. The original bottom charging mechanism generally uses a cylinder or hydraulic cylinder jacking mechanism to complete the charging process of the vertical vacuum furnace from the bottom of the furnace body. Due to the poor stability and strong impact of the cylinder or hydraulic cylinder in the process of reciprocating motion, it is difficult to control the accuracy of the lifting platform, the flatness of the working table and the vacuum sealing performance between the working table and the furnace body. In the prior art, there is also a screw rod lifting device, but in the lifting devic...

AI Technical Summary

Problems solved by technology

Due to the poor stability and strong impact of the cylinder or hydraulic cylinder in the process of reciprocating motion, it is difficult to control the accuracy of the lifting platform, the flatness of the working table and the vacuum sealing performance between the working table and the furnace body.

In the prior art, there is also a screw lifting device, but because only two plane guide columns are used in the lifting device for guidance, it is still difficult to ensure the flatness of the feeding lifting platform

[0003] In addition, the ordinary vacuum hot pressing furnace in the prior art adopts a vacuum resistance heating method, and uses graphite tubes for heating. During the heating process, its temperature rise rate is relatively slow; It is easy to break under pressure and damage the heating graphite tube

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