JPS5811724A - Heat treatment furnace - Google Patents

Abstract

PURPOSE:To eliminate the need for providing any lifter or the like and to make a titled furnace economical by disposing a conveyor obliquely, and matching the feed side and discharge side of the heat treatment furnace to the level difference between the installation in a fore stage and the installation in a post stage. CONSTITUTION:A heat treatment furnace 1 is installed on a base 2, and, for example, a walking beam type conveyor 5 is disposed obliquely to match the feed side 1 and discharge side 0 of a heat treatment furnace 1 to the level difference between the installation in a fore stage and the installation in a post state. Therefore, for example, a pipe to be heated, which is charged into the conveyor 5 by a charger is transferred to the installation in the post stage without requiring any lifter or the like despite the existence of the installation in the post stage at a level higher than that of the installation in the fore stage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat treatment furnace used for hardening, tempering, etc. of steel pipes.

When heating steel pipes for quenching and tempering them, the steel pipes to be heated are usually placed in a pre-processing facility such as the El line with a fixed diameter, and then moved through the furnace by a charging machine installed on the inlet side of the heat treatment furnace. In general, steel pipes are fed laterally into a beam, transported at a predetermined speed through a heat treatment furnace, heated, and then sent to post-process equipment (e.g., quenching equipment or cooling bed) by an extractor installed on the outlet side. In production lines, the pre-process equipment of heat treatment furnaces such as fixed-diameter furnaces and the post-process equipment such as quenching equipment and cooling beds are different in the level through which the steel pipe passes due to the structure of the equipment, and the post-process equipment is different. The level of equipment is often higher than the level of front-end equipment.

On the other hand, the hearth and walking beam of the heat treatment furnace are arranged horizontally, and the steel pipe to be heated is transported horizontally inside the furnace by the walking beam.

For this reason, in a heat treatment furnace installed between pre-process equipment and post-process equipment, if the input side is adjusted to the level of the pre-process equipment, there will be a level difference (step) between the output side and the post-process equipment. occurs. In order to adjust this, conventionally a lifting mechanism was required to lift the heated steel pipe extracted from the heat treatment furnace to the level of the post-process equipment and transfer it to the post-process equipment. This resulted in an increase in the occupied area and an increase in energy costs, making it extremely uneconomical.

The present invention was made in order to solve the above-mentioned conventional problems, and the steel pipe conveying device is arranged at an angle to match the level of the pre-process equipment and the post-process equipment. This eliminates the need for level adjustment equipment on the side. The present invention will be explained below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention.
1 is a heat treatment furnace installed on the base 2, ■ is the inlet side of the steel pipe to be heated, and O is the outlet side. 3 is the hearth, entrance side! and exit side 0
are arranged at an angle to match the level of the 4m, 4
b, 4c, and 4d (hereinafter sometimes collectively referred to as 4) are lower hearths provided below the hearth 30;
Each one is filled with water. When the hearth 5 is placed horizontally as in the conventional case, the lower hearth is placed approximately parallel to the hearth at a certain distance, but in the present invention, the hearth 6 is placed at an angle. Therefore, if the lower hearth was placed parallel to the hearth 3, it would not be possible to fill the entire surface with water. Therefore, the lower hearth 4 was divided as appropriate (in this example, divided into four ) and each lower hearth 41 to 4d
Each of the lower hearths 48 to 4b is arranged horizontally and adjacent lower hearths are connected to each other, and each of the lower hearths 48 to 4b is filled with water.

Reference numeral 5 denotes a walking beam type conveyor device arranged at appropriate intervals on both sides of the hearth 40 and/or between them, and 51 is its fixed beam, which is arranged parallel to the hearth 3, that is, at an angle. Concave portions are formed at pitches. Reference numeral 6 denotes a movable beam of the walking beam type conveyance device 5, which is arranged parallel to the fixed beam 51 and with a half-pitch shift in the upper part.

7a and 7b are movable beam drive mechanisms provided below the lower hearth 40; drive plates 71a and 71b;
.

Rods 72a to 72n connecting 71b and the movable beam 6
.

It consists of drive parts 73a to 73d equipped with cams, and a motor 74 for driving the drive parts 7shi to 73d.

8 is a ceiling wall of the heat treatment furnace 1, for example, the first wall. Second heating furnace 8
1a, 81b, 1st. It constitutes second soaking furnaces 82a, 82b, etc., each of which is provided with a large number of gas burners.

FIG. 2 is a side view of an embodiment of the charging mechanism on the inlet side I of the heat treatment furnace and the extraction mechanism on the outlet side O. Enter! , the heated steel pipe ptt was fed from the pre-process equipment.

It is sent to a notch 93 of a rotary plate η having one or several notches 93 around it by a push-out machine 91 of the charging machine 9,
is intermittently sent to the rotating arm 94 as the rotating plate η rotates,
By one rotation of the rotary arm 94, it is loaded into the recess of the walking beam type conveyor 5. Further, at the exit side 0 [, the heated steel pipe P transported by the walking beam type transport device 5 is transferred by the extractor 10 to the notch 103 of the rotary plate 102 having the same structure as the rotary plate η and Hr on the charging side, It is ejected from the ejector 101 to post-process equipment.

Next, the operation of the present invention will be explained. The steel pipe P to be heated charged from the charging machine 9 to the walking beam type transfer device 5 in the furnace is transferred to the output @O by the action of a normal walking beam, during which time it is heated to a predetermined temperature by a burner. The steel pipe P sent to the output side 0 is sent to the post-process equipment by the extractor 10. During this time, the level is automatically changed to pIIJ, so that the post-process equipment is higher than the pre-process equipment. However, even if the material is removed, it can be transferred directly to post-processing equipment without requiring a lift machine.

In the above explanation, the case where the level of the post-process equipment is higher than the pre-process equipment is shown, but it goes without saying that the same procedure can be carried out even when the pre-process equipment is located at a higher place than the post-process equipment. In addition, although we have described the case where the steel pipes in the furnace are transported by a walking beam type fine transport device, a walking hearth or other transport device may also be used. Further, although an example of a steel pipe charging machine and an extracting machine is shown in Fig. 2, the present invention is not limited to this, and other mechanisms may be used. good.

As is clear from the above explanation, in the present invention, the conveying device for heated steel pipes is arranged in an inclined manner according to the level of the pre-process equipment and the post-process equipment, so the difference in level can be adjusted during transport in the furnace. Therefore, there is no need to provide a special lifting area on the exit side, and it is extremely economical.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a side view of the embodiment on the entrance and exit sides thereof. 1: Furnace body! Two person side, O: Output side, 3: Hearth, 4: Lower hearth, 5: Walking beam type conveyance device. 51: Fixed beam h, 6: Movable beam, 7a, 7
b: Movable beam drive mechanism, 9: Charging machine, 10: Extracting machine, P: Heated steel pipe. Agent Patent Attorney Masatoshi Sato

Claims (1)

[Claims] A charging side of a heat treatment furnace, in which the conveying device is arranged at an angle. A heat treatment furnace characterized in that the extraction side is adjusted to match the level difference between the equipment for the front process and the equipment for the post process.