JPH03249118A - Heat treating furnace for steel products - Google Patents

Abstract

PURPOSE:To reduce a floor space by forming a treating chamber for making heat treatment to a vertical type and providing an endless steel product transporting member which is intermittently moved via an inlet and outlet across the treating chamber and an open area on the exterior and lower side thereof. CONSTITUTION:The treating chamber 31 which is enclosed by heat insulating materials 21 supported to a frame body 11 and is internally provided with plural heating sources 41 is formed to the vertical shape and the exterior and lower side of the treating chamber 31 is formed as the open area 32. Upper and lower sprockets 51, 52 are respectively provided in the treating chamber 31 and the open area 32 and the endless transporting member 61 mounted with receivers 71 opened only at the end faces on one side at prescribed intervals is engaged between this chamber and the area via the inlet 81 and the outlet 82. For example, the sprocket 51 is driven intermittently in an arrow direction to intermittently move the plural receivers 71 via the transporting member 61. Steel products A are pushed and housed into the receivers 71 in the open area 32 while the receivers are held stopped. The steel products A are charged to the treating chamber 31 of the atmosphere of the temp. higher than the temp. thereof an are heated to a prescribed temp. during transportation; thereafter, the steel products are taken out of the ontlet 82 to the open area 32.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a heat treatment furnace for steel materials.

Tempering, normalizing, annealing, etc. are performed to give the steel material hardness and W.
When imparting J property 1 mechanical properties etc., use a heat treatment furnace,
The steel material is heated in a processing chamber with an atmosphere at a temperature higher than the temperature of the charged material.

The present invention relates to a heat treatment furnace used in tempering, normalizing, annealing, etc., when steel materials are heated in a treatment chamber with an atmosphere at a temperature higher than the temperature of the charged product, and in particular, a heat treatment furnace in which the treatment chamber is formed in a vertical shape. The present invention relates to a heat treatment furnace.

<Prior art> Conventionally, roller hearth type, walking beam type, Cast link type, meshbelt type, etc.
There are various formats. All of these systems have a horizontal processing chamber surrounded by heat insulating material and equipped with a heating source and a fan. The steel material is heated while being conveyed in a plane from the left to the right, for example.

<Problems to be Solved by the Invention> However, the conventional heat treatment furnaces as described above have a problem that the installation space is large because the processing chambers are formed horizontally.

The present invention solves this problem.

Means for Solving the Problems> The present invention provides a heat treatment furnace for heating steel materials in a treatment chamber with an atmosphere at a temperature higher than the temperature of the charged material, the furnace being surrounded by a heat insulating material having an inlet and an outlet, and The processing chamber in which the source is housed is formed in a vertical shape, and the space between the upper sprocket installed in the processing chamber and the lower sprocket 2 installed in the open area below the outside of the processing chamber. is engaged with an endless conveyor member to which a plurality of receivers for storing steel materials are attached, and by intermittently driving one of the sprockets, the receivers are lengthened as a whole through the conveyor member. Heat treatment of steel materials, the main feature of which is to move the steel materials intermittently in a circular manner to sequentially charge the material from the open area to the processing chamber, and at the same time sequentially charge the steel material from the processing chamber to the open area. Related to furnaces.

In the present invention, the processing chamber is formed in a vertical shape, and the outer lower part of the processing chamber is an open area.

the processing chamber is equipped with an upper sprocket, and the open area is equipped with a lower sprocket;
An endless conveying member is engaged between the upper and lower sprockets, and a plurality of receivers for storing steel materials are attached to the conveying member. Therefore, the conveying member and the receiver straddle the processing chamber and the open area via an inlet and an outlet provided in a heat insulating material surrounding the processing chamber.

Effects> In the present invention having the above configuration, when one of the upper and lower sprockets is intermittently driven, the plurality of receivers are intermittently moved via the conveying member. Such intermittent movement of multiple receivers is as follows: charging from the open area to the processing chamber → rising in the processing chamber → turning along the upper sprocket in the processing chamber - descending in the processing chamber → loading from the processing chamber to the open area - Downsatsu in the open area → Turning along the lower sprocket in the open castle → Ascending in the open area → Charging from the original open area to the processing chamber, repeating the above process, creating an elliptical shape in the vertical direction as a whole Intermittent movement. Therefore, if steel is stored in the corresponding receiver during the rising stage in the open area while the sprocket is stopped, the steel will rise and rotate in the processing chamber and be heated in the Shimonoseki stage before being opened. During the lowering or pivoting phase of the receiver in the area, it is removed, for example mechanically or by its own weight.

According to the present invention, since the processing chamber is formed in a vertical shape,
Installation space can be reduced. If the processing chamber has a relatively small capacity, a stirring effect can be obtained by intermittent lifting, rotation, and lowering of multiple receivers containing steel materials.

It is possible to omit installing a fan in the processing chamber, and the wasted space in the processing chamber can be eliminated accordingly. In this case, if the shoulder of the processing chamber is tilted or curved downward,
Furthermore, wasted space in the processing chamber can be eliminated and the temperature distribution in the processing chamber can be improved.

In addition, if the upper sprocket is a driving sprocket and the lower sprocket is an idler sprocket supported by the driving sprocket via a conveying member, thermal expansion can be absorbed, resulting in smoother and safer operation. can be achieved. If the open area is equipped with a cooling mechanism for the steel stored in the receiver loaded from the processing chamber to the open area, the steel heated in the processing chamber will be cooled in the open area by the cooling mechanism. It can be cooled to a predetermined temperature.

<Embodiment> FIG. 1 is a side view schematically showing an embodiment of the present invention, partially in section. A processing chamber 31 is formed in a vertical shape surrounded by a heat insulating material 21 supported by a frame 11, and a plurality of heat sources 41 and a fan 42 are installed inside the processing chamber 31. The outside lower part of the processing chamber 31 is an open area 32, and the processing chamber 3
1 is equipped with an upper sprocket 51, and the open area 32 is equipped with a lower sprocket 52. In the drawing, the upper sprocket 51 is the driving sprocket, and the lower sprocket 52 is the idler sprocket. It has become a sprocket. An endless conveying member 61 is engaged between the upper and lower sprockets 51 and 52 supported on the frame 11, and the conveying member 61 has a plurality of receivers 71 with only one side end open. They are installed at predetermined intervals. The conveying member 61 and the plurality of receivers 71 straddle the processing chamber 31 and the open area 32 via an inlet 81 and an outlet 82 provided at the bottom of the heat insulating material 21 surrounding the processing chamber 31 .

When the upper sprocket 51 is driven intermittently, the plurality of receivers 71 are intermittently moved via the conveying member 61. Such intermittent movement of the plurality of receivers 71 is as described above. During the rising phase of the receiver 71 in the open area 32, while the sprocket 51.52 is at rest, the receiver 7 therefore
1 is stopped, when the steel materials A placed on the charging table 91 are pushed into the receiver 71 and stored, the steel materials A are sequentially charged together with the receiver 71 from the inlet 81 into the processing chamber 31. Ru.

The processing chamber 31 has a temperature higher than the temperature of the steel material A to be charged due to the plurality of heat sources 41. Therefore, the steel material A is heated to a predetermined temperature during the rising, rotation, and lowering stages of the receiver 71 in the processing chamber 31. heated to temperature. and steel material A
is discharged from the outlet 82 to the open area 32 together with the receiver 71,
During the turning stage of the receiver 71 in the open area 32, it falls into the packet 92 due to its own weight (not shown).
A duct is provided that surrounds the receiver 71 in the descending stage in the open area 32, and when cold air is passed through the duct to the heated steel material A stored in the receiver 71, the steel material A is cooled to a predetermined temperature. be able to. In this case, the receiver 71 is one having a large number of punched holes, for example, in consideration of its ventilation.

FIG. 2 is a side view of essential parts schematically showing another embodiment of the present invention, partially in section. Other structures, such as the plurality of heat sources 43, the upper sprocket 53, the conveying member 62, and the plurality of receivers 72, whose explanation is omitted, are the same as in the case of FIG. 1, but in this embodiment, the frame 12 In this embodiment, the top of the heat insulating material 22 supported by the insulating material 22 has a semicircular cross section, and therefore the shoulder of the processing chamber 33 is curved downward, and the processing chamber 33 is not equipped with a fan. , it is possible to eliminate wasted space in the processing chamber 33, and also to improve the temperature distribution, so it is particularly suitable for a relatively small heat treatment furnace.

The configuration of the present invention has been explained above based on the illustrated embodiments, but in each embodiment, for example, various heaters, burners, etc. can be used as the heating source, and the conveying member can be engaged with the upper and lower sprockets. A chain can be used, and multiple receivers can be screwed together with bolts and nuts through reinforcing members if necessary to the links of the chain, and a conveyor can be used instead of a packet. be able to.

<Effects of the Invention> As is already clear, the present invention described above has the advantage that the installation space can be reduced, and it is particularly suitable for a relatively small heat treatment furnace.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention, partially in section, and FIG. 2 is a side view schematically showing a principal part of another embodiment of the present invention, partially in section. 11.12...Frame, 21.22...Insulating material 3
1.33...Processing chamber, 32...-Open area 41.4
3...Heating source, 42...Fan 51.52.5
3... Sprocket 81.1112... Transfer member, 71.72... Receiver 81... Inlet, 82... Outlet, A... Steel material

Claims (1)

[Claims] 1. A heat treatment furnace for heating steel materials in a treatment chamber with an atmosphere at a temperature higher than the temperature of the charged product, the treatment chamber having an inlet and an outlet, surrounded by a heat insulating material, and equipped with a heating source. is formed in a vertical shape, and a plurality of receivers for storing steel materials are located between an upper sprocket installed in the processing chamber and a lower sprocket installed in an open area below the outside of the processing chamber. is engaged with an endless conveying member having an attached sprocket, and by intermittently driving one of the sprockets, the entire receiver is intermittently moved in an elliptical shape through the conveying member to leave the open area. A heat treatment furnace for steel materials configured to sequentially charge the steel material into the processing chamber and simultaneously sequentially discharge the steel material from the processing chamber to the open area. 2. The steel heat treatment furnace according to claim 1, wherein the upper sprocket is a driving sprocket, and the lower sprocket is a floating sprocket supported by the driving sprocket via a conveying member. 3. The steel heat treatment furnace according to claim 1 or 2, wherein the treatment chamber is equipped with a fan. 4. A heat treatment furnace for steel materials according to claim 1, 2 or 3, wherein the treatment chamber has a shoulder portion that is sloped or curved downward. 5. Claim 1, wherein the open area is equipped with a cooling mechanism for steel stored in a receiver loaded from the processing chamber to the open area.
A heat treatment furnace for steel materials according to 2, 3 or 4.