JPH0367991A - Delivery door device of heating furnace, and opening and closing of the device - Google Patents

Abstract

PURPOSE:To stably deliver a billet by constructing a device so that a delivery door of a heating furnace is made into a double structure of parent and child doors independently opened and closed, and the parent door has a larger size than a delivery port and has an opening narrower than the delivery port, and the child door is located outside the parent door to block the opening of the parent door. CONSTITUTION:A heating furnace 1 has a larger size than a delivery port 2 and includes an opening 3A therein narroweer than the delivery port 2. A child door 4 is located outside the parent door 3 so as to block the opening 3A in the parent door 3. Upon delivery of a billet M, both parent and child doors 3, 4 are opened and the billet M is delivered by a delivery roller 10. The billet M so delivered is turned in its orientation by a turning machine 6, and it is detected by a turning detector 5. Further, the billet M, after descaled by a descaler 7, is bitten by a continuous rolling mill 8. Once the byting is stabilized, only the parent door 3 is closed. Thereafter when the delivery of the billet M is completed, the child door 4 is also closed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extraction door device for a heating furnace and a method for opening and closing the extraction door.

[Conventional technology]

The extraction port of the heating furnace is usually much larger than the size of the target steel piece to be extracted. Also, except during extraction,
In order to prevent hot air from escaping from the extraction port and loss of thermal energy, one extraction door is provided to be openable and closable.

[Problem to be solved by the invention]

If the size of the extraction port is slightly larger than the steel piece to be extracted, the amount of hot air escaping through the gap between the steel piece and the extraction port will be small, resulting in a high energy saving effect.

However, when extracting the steel pieces, extraction troubles may occur, and for this reason, it is necessary to make the opening area of the extraction port large with some margin.

Therefore, conventionally, such restrictions have limited energy saving. In addition, because the opening area of conventional extraction ports is large, there is a high risk that flames will blow out from the extraction ports and various detection devices installed on the outlet side of the extraction ports will be damaged or troubled by the heat. .

Therefore, the main purpose of the present invention is to provide an extraction door that has a simple structure, has a high energy-saving effect, can respond well to extraction troubles, and has less impact on the detection equipment installed on the extraction side. The goal is to provide equipment.

[Problem to be solved by the invention]

The device of the present invention for solving the above problems has two main doors and a child door that open and close independently as extraction doors of a heating furnace.
The main door has a larger size than the extraction port and an opening with a narrower area than the extraction port, and the child door is located outside the main door and has an opening in the main door. It is characterized by being made to close.

Further, the method of the present invention uses a double door of a master door and a child door that open and close independently as the extraction door of the heating furnace, and the master door has a larger size than the extraction port and is narrower than the extraction port. an opening of a certain area is formed, the child door is located outside the main door so as to block the opening of the main door, and at the initial stage of extraction, both the main door and the child door are opened;
When the extracted steel pieces are caught in the continuous rolling mill and the biting becomes stable, only the main door is closed, and when the extraction is completed, the child door is closed.

Note that in the present invention, the heating furnace includes various combustion furnaces such as a soaking furnace.

[Effect]

In the present invention, when extraction is not performed, both the main door and child door are closed to prevent hot air from escaping. However, during extraction, only the child door is opened and the main door is closed. Make sure to extract from the opening. The opening of this main door is narrower than the extraction port, so the amount of hot air escaping can be reduced, resulting in a high energy saving effect. Incidentally, as shown in the examples below, a reduction of about 20% was possible. Moreover, when the extractor starts extraction and in the initial stage of extraction when there is a risk of extraction trouble, the main door is left open, but once the extraction has stabilized, the main door is closed. Work is stable and extraction troubles can be avoided.

[Specific structure of the invention]

The present invention will be explained in more detail below with reference to specific examples shown in the drawings.

1 is a heating furnace, and the steel pieces M are extracted from its extraction port 2 in the direction of the arrow in FIG. A master door 3 and a child door 4, which will be described in detail later, are disposed in the extraction port 2 so as to be openable and closable. On the outlet side of the extraction port 2, a steel piece turning detector 5 for detecting the extracted steel pieces using, for example, a laser beam is provided. first stands 8 are provided in sequence.

In the present invention, the heating extraction door is a double door consisting of a main door 3 and a child door 4 that open and close independently, and the main door 3 has a larger size than the extraction port 2, and An opening having an area narrower than the opening 2 (naturally larger than the cross-sectional area of the extracted steel piece M), for example, a house-shaped opening 3A is formed.

Further, the child door 4 is located outside the main door 3 and has an opening 3A of the main door 3.
It is formed to block the

In the apparatus configured in this manner, when extracting the steel pieces M, both the main door 3 and the child door 4 are opened as shown in FIG. 3, and the steel pieces M are extracted by the extraction roller 10. Ru. The direction of the extracted steel piece M is changed by the turning machine 6, and the direction change is detected by the turning detector 5. Next, after being descaled by a descaler 7, it is fed into a continuous rolling mill 8. Once this grip becomes stable, close only the main door 3 as shown in FIG.

After that, when the extraction of the steel piece M is completely completed, the child door 4
can also be closed.

Thereafter, the opening and closing of the main door 3 and the child door 4 are repeated in the same manner according to each stage of such extraction and biting of the steel billet M into the continuous rolling mill 8.

Therefore, in the time from when the billet M is bit into the rolling mill until the end of extraction, when the extraction port 2 is completely opened, the main door 3 is opened by opening 3A narrower than the extraction port 2.
Since the opening is closed, the amount of hot air escaping between the steel piece M and the opening is reduced.

In the present invention, the opening/closing timing of the main door 3 and the child door 4 is preferably in accordance with the above example, but is not necessarily limited thereto.

〔Example〕

According to the above example, when extraction was performed using the main door 3 having an opening 3A narrower than the extraction port 2, the heat loss from the extraction port 2 was 5X]0"kcal/T in the conventional case. On the other hand, according to the example of the present invention, the heat loss from the opening 3A is 4 x 103 kcal/T, which is about 20%.
A reduction was seen.

〔Effect of the invention〕

As described above, according to the present invention, although it has a simple structure, it has a high energy-saving effect and can respond well to extraction troubles. Furthermore, it can prevent damage to the detection equipment installed on the extraction side and operation troubles. It can be prevented.

[Brief explanation of drawings]

FIG. 1 is an overall view of the arrangement of the device of the present invention, FIG. 2 is a perspective view of the double door, and FIGS. 3 to 5 are front views of the door in the opening and closing stages. 1... Heating furnace, 2. Extraction port, 3. Main door, 3A... Opening, 4... Child door, 8... First stand of continuous rolling mill.
10...Extraction roller.

Claims (2)

[Claims] (1) The extraction door of the heating furnace is a double door consisting of a main door and a child door that open and close independently, and the main door has a larger size than the extraction port, and has an opening with a narrower area than the extraction port. 1. An extraction door device for a heating furnace, wherein the child door is located outside the main door and closes an opening of the main door. (2) The extraction door of the heating furnace is a double door consisting of a main door and a sub-door that open and close independently, and the main door has a larger size than the extraction port and an opening with a narrower area than the extraction port. the child door is located outside the main door and closes the opening of the main door, and at the initial stage of extraction, both the main door and the child door are opened;
An extraction door of a heating furnace characterized in that when the extracted steel pieces are caught in a continuous rolling mill and the biting becomes stable, only the main door is closed, and then when the extraction is completed, the child door is closed. How to open and close.