JPS60221518A - Device for heat treatment of atmosphere - Google Patents

Abstract

PURPOSE:To prevent mixing of atmosphere gases between furnaces and to transfer steplessly a article to be treated by using one piece of circulating mesh belt as a transfer means of said article passing through connected horizontal and hump type treating furnaces having a different atmosphere and preventing the rising of belt at this connected part of both furnaces. CONSTITUTION:The 1st and 2nd treating furnaces 5, 8 are respectively supplied with air or exothermic gases N2, H2 or both mixed gas from atmosphere inlets 11, 10. The article to be treated is heated for removing adhered matters of oil, etc. inside the furnace 5, then heated in nonoxidizing state inside the furnace 8 and taken out after cooling in a cooling chamber 9. Now due to the furnace 5 being horizontal and the furnace 8 being hump type, a vapor, etc. generated inside the furnace 5 does not enter the furnace 8 owing to the difference in specific gravity even if invaded in the entrance of the furnace 8. Also one piece of mesh belt 1 is driven by a device 2 and a supplementary belt 3 driven with a device 4 synchronized therewith and vertical motions 1', 1 at the part A of the belt 1 are detected by detectors 6, 7. These are sent by signals from transmitters 16, 17 to increase or decrease the speed of the belt 3 and a speed change gear 4' respectively, and the vertical motions 1', 1 are stabilized.

Description

Detailed Description of the Invention The present invention relates to an atmospheric heat treatment apparatus in which at least two types of heat treatment furnaces having different atmospheres are connected.More specifically, the atmospheric heat treatment furnace according to the present invention includes a horizontal treatment furnace and a hump type treatment furnace. This is a heat treatment method in which the two parts are connected in series using a grafted mesh belt, thereby enabling stable heat treatment without mutual interference between the respective atmospheres.

In addition, the present invention provides a means for conveying the processed material through the continuously connected processing furnaces using a single series continuous circulating mesh belt, and the concave connecting portion of the mesh belt between the horizontal processing furnace and the hump type processing furnace. The invention is characterized in that it is provided with a control means for preventing electrical buildup.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below by way of embodiments with reference to the drawings.

In FIG. 1, the first processing furnace 5 is a furnace whose atmosphere is air or exothermic gas supplied from the atmosphere inlet 11, and the second
The processing furnace 8 is a hump type furnace whose atmosphere is nitrogen, hydrogen, or a mixture of nitrogen and hydrogen from an atmosphere inlet io. The object to be treated is, for example, an electromagnetic steel plate or the like, which is a processed product such as a press, and the deposits such as oil on the object are removed by heating in the first processing furnace 5, and then heated and removed in the second processing furnace 8. The product is fermented and heated, cooled in a cooling chamber 9, and then taken out.

In general, meshbelt continuous furnaces are of the almost horizontal straight type, or of the hump type with a gently convex shape as a whole. Since the purpose of the second processing furnace 8 is to perform non-oxidation heating with high precision, it is necessary to maintain a high purity atmosphere. For this reason, in the present invention, the second processing furnace, which uses atmosphere scum with low specific gravity such as hydrogen or nitrogen, is of a hump type.

By the way, if the entire heat treatment equipment is straight or the entire equipment is a hump type, in order to prevent the gas generated in the first treatment furnace 5 from entering the second treatment furnace 8, it is necessary to It is necessary to increase the internal pressure by increasing the amount of atmospheric gas introduced. However, in the present invention, as described above, the first processing furnace 5 is arranged horizontally, and the water vapor generated by heating inside the furnace is Even if they enter through the inlet of the second processing furnace 8, they are discharged from the exhaust duct at the inlet without being mixed into the furnace 8 due to the difference in the specific gravity of the atmospheric gas in the furnace.
This allows the accuracy of the atmosphere inside the furnace 8 to be maintained. This is,
This is the first feature of the present invention.

Furthermore, a feature of the present invention is that the mesh belt 1 that circulates through the linear horizontal furnace 5 and the convex hump type furnace 8 that are connected to each other is one continuous belt, and the products to be processed are conveyed steplessly in series. It is to be.

When the horizontal furnace 5 and the hump type furnace 8 are connected, the mesh belt forms a concave shape at the connection part A, so there is a drawback that the mesh belt lifts at the A part when tension is applied to the mesh belt. In order to compensate for this drawback, it is possible to prevent the swelling of the mesh belt in the A section by physical means such as a roller guide. As shown in the figure, a mesh belt feeding auxiliary belt 3 driven by an auxiliary belt drive device 4 was provided.

Thus, the mesh belt drive device 2 that drives the mesh belt 1 and the auxiliary belt drive device 4 are synchronized, and k(1'
), the downward movement (1) is detected by the detector 6.7. This is sent as a signal from transmitters 16 and 17, and the auxiliary belt transmission 4' is increased in speed when the signal is from 16 and decelerated when the signal from 17 is received.
1. The downward movement is stabilized between detectors 6 and 7. This is a further feature of the heat treatment apparatus according to the present invention.

In the hydrothermal treatment equipment having the characteristic configuration as described above, the atmospheres of the first treatment furnace and the second treatment furnace often mix, and the products to be treated are passed through a continuous belt. An excellent effect is exhibited in that the mensch belt is transported smoothly and does not bulge even in the trough at the foot of the connection between the Sl processing furnace and the second processing furnace.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of an atmospheric heat treatment furnace according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a mesh belt position detection means. Code - Description - Mesh belt 2 - Mesh belt drive device 4 - Auxiliary belt drive device 4' - Auxiliary belt speed change [35-1st
Processing furnace 6.7-Meshbelt position detector 8-Second
Processing furnace 9-Cooling chamber 10.11-Atmosphere inlet 16.
17-Metschbelt position transmitter patent applicant Kanto Yakin Kogyo Co., Ltd.

Claims (1)

[Claims] At least two different types of atmospheric gas heating furnaces are connected to each other in an atmosphere heat treatment apparatus, and the atmosphere gas furnace includes a horizontal treatment furnace and a hump type treatment furnace connected to each other, and the atmosphere gas is circulated through the atmosphere heat treatment apparatus. The mesh belt is made into one continuous belt, and the upward displacement of the concave bent part of the mesh belt at the connection part between the horizontal processing furnace and the hump type processing furnace is determined by adjusting the transport speed of the mesh belt before and after the connection part. Atmospheric heat treatment apparatus 6 characterized by the following: