JPH03128659U

JPH03128659U -

Info

Publication number: JPH03128659U
Application number: JP3751390U
Authority: JP
Priority date: 1990-04-06
Filing date: 1990-04-06
Publication date: 1991-12-25

Description

[Brief explanation of drawings]

第１図及び第２図は本考案の実施例を示し、第
１図はＮ_２ベース・ガス浸炭炉の爆発防止装置の
概略系統図、第２図は同浸炭炉の炉扉の正面図、
第３図は従来技術を示す第１図相当図である。１……熱処理室、２……搬送口、３……炉扉、
４……２の下部、５……電熱ヒータ、６……開扉
検出センサ。 Fig. 1 and Fig. 2 show an embodiment of the present invention, Fig. 1 is a schematic system diagram of an explosion prevention device for an _N2 base gas carburizing furnace, Fig. 2 is a front view of the furnace door of the carburizing furnace,
FIG. 3 is a diagram corresponding to FIG. 1 showing the prior art. 1... Heat treatment chamber, 2... Transfer port, 3... Furnace door,
4... Lower part of 2, 5... Electric heater, 6... Open door detection sensor.

Claims

[Claims for Utility Model Registration] 1. A furnace door 3 is provided at the transfer port 2 of a heat treatment chamber 1 for heat-treating steel materials so as to open upward;
An electric heater 5 is disposed at least in the lower part 4 of the furnace door 3, and when the furnace door 3 is opened, the electric heater 5 burns the flammable gas in the heat treatment chamber 1 to form a frame curtain at the transfer port 2. This is an explosion prevention device for batch-type heat treatment furnaces. 2. An open door detection sensor 6 that detects opening movement of the furnace door 3 is attached near the lower part 4 of the transfer port 2, and the open door detection sensor 6 is linked to the electric heater 5 to detect when the furnace door 3 is opened. Accordingly, the electric heater 5 is activated by a signal from the door open detection sensor 6 that detects the start of the door opening movement.
2. The explosion prevention device for a batch type heat treatment furnace according to claim 1, wherein the explosion prevention device is configured to operate.