JPS6376712A - Transfer table for metallic stock - Google Patents

Abstract

PURPOSE:To save an amount of an inert gas and to improve the yield of metallic stocks by forming a gas curtain by injecting the inert gas to be layers, dividing the inside of a chamber in plural regions, and sequentially supplying the inert gas to the divided regions by use of a control means. CONSTITUTION:When a photomaster 40 detects the top of a steel sock, the photomaster 40 sends a signal to a controller 38A so that nitrogen gas is injected into a 1st region 32A from an inert gas injection nozzle 24 to fill the region 32A with the nitrogen gas. The top of the stock entering the region 32A is detected by the photomaster 40 to actuate a controller 38B and to supply nitrogen gas to a 2nd region 32B from the nozzle 24 for the 2nd region 32B. After prescribed amount of steel stocks is transferred, a signal is sent to the controller 38A to stop the gas supply to the nozzle 24. Then, the stock enters the 2nd region 32B, the top of the stock is detected by the photomaster 40, and the gas supply into a 3rd region 32C is started. An amount of the steel stock is measured by a measuring roll 42 and the gas supply into the region 32B is stopped after transferring a prescribed amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a conveyance table for conveying synthetic materials such as steel materials.

[Prior Art] For example, in a rolling process of rolling a steel material, the steel material is heated to a red-hot state in a heating furnace and then rolled by a rolling roll. The rolled steel material is transported to the next rolling process while being exposed to the atmosphere.

However, the surface of red-hot steel is easily oxidized, and scale forms when exposed to the atmosphere.

Therefore, when the steel material is heated and then transported to the next process, scale is generated on the surface of the steel material. When scale is generated in this way, it is removed by mechanical descaling or pickling using a high-pressure water jet, wire brush, shot blasting, or the like.

[Problems to be solved by the invention] With conventional steel transport tables, the steel during transport comes into contact with the atmosphere.
There is a problem in that scale is generated on the surface of the steel material and the yield of the steel material is reduced due to scale loss.

This invention was made in view of such circumstances, and an object thereof is to provide a transport table for gold material r1 that can improve the yield of metal materials.

[Means for Solving the Problems] A metal material conveyance table according to the present invention includes table rollers disposed along a conveyance path for conveying metal materials;
A chamber plate that covers the I and the metal material being fed on the table roller, an inert gas supply means that fills the inside of the chamber with inert gas, and a gas curtain that is formed by spraying the inert gas in a stone shape. A dividing means that divides the inside of the chamber into a plurality of regions, and a control means that controls the inert gas supply means so as to sequentially supply inert gas to the divided regions according to the conveyance of the metal material. It is characterized by

[Operations] According to the present invention, the conveyance table for conveying the metal material is filled with an inert gas atmosphere. Therefore, since the Gold 1 material is not brought into contact with the atmosphere during transportation, it is possible to prevent scale from forming on the surface of the Gold 1 material. Furthermore, the inside of the inert gas chamber is divided into multiple regions by an inert gas curtain, and when the chamber is filled with inert gas, each region in the chamber is sequentially filled with inert gas as the material progresses. Since it is filled with gas, the amount of inert gas used can be saved.

[Embodiments] Examples of the present invention will be described in detail below with reference to FIGS. 1 and 2 of the accompanying drawings. In the process of hot rolling steel materials, the steel materials are heated to a red-hot state in a heating furnace, and after being roughly rolled, they are conveyed to a hot strip mill and rolled to a predetermined thickness. Between the rough rolling mill and the hot strip mill, t
An m-feeding table 10 for conveying JA material is provided.

A table roller 12 is arranged on the conveyance table 1o along the conveyance path, and as the table roller rotates, 10 materials 14 are rolled into contact with the circumferential surface of the table roller 12.
is transported along the direction of the arrow. table roller 12
Above, ten chamber plates 16 are arranged in a row to cover the table rollers from above so as to define chambers 18 in the transport table 10. The side surface portion 17 of each chamber plate 16 extends to the table row 512.

On the other hand, in each chamber plate 16, on the inlet side and outlet side of the steel material, the table roller 1
2 to a position at least equal to or greater than the thickness of the steel material. Between each table roller 12! A reflecting plate 22 is provided below the material A to reflect the heat radiated from the steel material. The reflector plate 22 defines the chamber 18 together with the plurality of chamber plates 16, and also serves as a seal to prevent atmospheric air from entering the chamber.

In each chamber plate 16, inert gas supply nozzles 24 that inject nitrogen (N2) gas as an inert gas downward and upward are arranged at equal intervals above and below along the conveyance direction of the steel material 14. has been done. By supplying nitrogen gas from the inert gas supply nozzle 24, the inside of the chamber 18 is filled with nitrogen gas.

On the other hand, injection nozzles 26 are arranged at the inlet and outlet of the conveyance table 10, respectively, along the transverse direction of the steel material, for injecting nitrogen gas downward and sealing it from the outside air. The injection nozzle 26 on the inlet side and the injection nozzle (not shown) on the outlet side each inject nitrogen gas in a layered manner to form a gas curtain 27 . Immediately below the injection nozzle 26 on the inlet side and the injection nozzle on the outlet side, suction ports 30 for sucking the injected nitrogen gas are provided so as to cross the conveyance path of the steel material.

Inside the chamber 18, 10a of mLBl (from the inlet side, a first area 32A, a second area 32BS, a third area 32G, . . .
A dividing injection nozzle 36 is provided to form a gas curtain 34 that is divided into . In this case, each #
The four regions 32A, 32B, 32C... are formed with a length of about 10 m per region corresponding to each chamber plate 16, and the dividing injection nozzle 36
6 are disposed adjacent to each other along the transverse direction of the steel material 14. Suction ports 37 for sucking the injected nitrogen gas are provided directly below the splitting injection nozzles 36 so as to cross the conveyance path of the steel material. In this way, the inside of the chamber 18 is divided into ten regions 32A, 32B, 32C1, . . . by the gas curtain 34.

Further, the inert gas supply nozzle 24 is connected to each region 32A, 3
28, 320..., control devices 38A, 38B, which control the supply of inert gas to the inert gas supply nozzle 24,
38C..., each control 21! Device 3
8A, 38B, 38C, . . . have electromagnetic valves, and are configured to open and close passages for inert gas supplied to each region in response to an opening/closing signal.

Further, in front of the entrance of the steel material conveying table 10 and in each region 32A, 32B, 32C, . . . in the chamber, a laser master or photo master 40 for detecting the tip of the steel material being conveyed is arranged. . This photo master 40 has corresponding control devices 38A, 138B, 38
C..., for example, the first v4 area 32A
When the photo master 40 installed in the second region detects the tip of the steel material, the control device 3 injects inert gas from the inert gas supply nozzle 24 located in the next second area [32B].
A close signal is issued at 8. In addition, each area 32A132B, 3
A measuring roll 42 is disposed at 2C, respectively, and measures the conveyance of the steel material. When the measuring roll 42 conveys the steel material by a predetermined distance, it sends a closing signal to the corresponding control devices 38A, 388138C, etc., and supplies nitrogen gas to the inert gas supply nozzle 24 arranged in the corresponding area. supply will be stopped.

For example, the measuring roll 42 disposed in the first region 32A stops supplying nitrogen gas to the inert gas supply nozzle 24 disposed in the first region 32A.

Next, the operation of this embodiment will be explained.

Steel materials rolled by a rough rolling mill (not shown) are transported to the next rolling process by a transport table 10. In the transport table 10, nitrogen gas is first supplied in advance from the inert gas supply nozzle 24 to the first region 32A, and the first region 32A is filled with nitrogen gas. By filling the conveyance path for the steel material with an inert gas atmosphere in this manner, it is possible to prevent scale formation due to oxidation of the steel material conveyed on the conveyance table 10. Further, when the steel material 14 enters the chamber 18 (or the first region 32A) of the transfer table 10, it passes through a gas curtain 27 formed on the entrance side of the chamber 18. Therefore, the steel material 14
Even in the event of an intrusion, the entrance can be reliably sealed.
It is possible to reliably prevent atmospheric air from entering the chamber 18. Although not shown, a gas curtain of inert gas is formed on the exit side of the conveyance table 10 by injection nozzles as well as at the entrance. Therefore, even when the steel material exits from the transport table 1o, the atmosphere is prevented from entering the chamber 18 in the same way as when it enters. Further, inside the chamber 18, nitrogen gas is constantly injected from each divided nozzle 36 to form a gas curtain 34.

When the vA material enters the conveyance table 10, the photo master 40 placed in front of the conveyance table detects the tip of the steel material and injects the inert gas injection nozzle placed in the first region 32. A signal is issued to control jll device 38A to inject nitrogen gas from 24. In response to this signal, the solenoid valve 38A of the υj control device is opened, and nitrogen gas is injected only from the inert gas injection nozzle 24 in the first region 32A, filling the inside of the first region 32A with nitrogen gas. Therefore, when the steel material 14 enters the first region 32A,
The inside of the region 32A is already filled with nitrogen gas.

In this case, the nitrogen gas pressure in the region 32A is several mm higher than the atmospheric pressure.
Ho is set to a high value.

Next, when the tip of the steel material 14 that has entered the first region 32A is detected by the photomask 40, the control device 38
B is activated, the injection nozzle 24 of the second fA region 32B is opened, and nitrogen gas is supplied to the second region 32B. The steel material 14 is further conveyed and rolls into contact with the measuring roll 42 in the second region 32B, where the distance over which the steel material 14 is conveyed is Ti! 1 is determined. Then, when the steel material 14 has been fed by a predetermined amount ff1iffl, a signal is sent to the control device 38A, and the supply of nitrogen gas to the nozzle 24 is stopped.

Next, the steel material 14 passes through the gas curtain 34 and passes through the second
intrudes into area 32B. Second area 32 B Te+,
t. Similar to the first region vi32A, the tip of the steel material is detected by the photo master 4o, and the supply of inert gas to the third region 32C is started.

Then, by the measuring roll 42, the second area 3
After the steel seedlings passing through 2B are measured and transported a predetermined distance, the nitrogen gas supply to the second region 32B is stopped. The steel material 14 then enters the third region 32C.

In this way, on the conveyance table, nitrogen gas is supplied only to the regions through which the steel materials pass sequentially, and the supply of nitrogen gas is stopped in the regions where the steel materials pass through.

According to this embodiment, since nitrogen gas is supplied only to the region through which the steel material passes, the amount of nitrogen gas used can be saved.

Furthermore, since the chamber of the transfer table filled with inert gas is divided into multiple parts, even if the chamber is damaged and nitrogen gas leaks, the nitrogen gas will leak only in that area, so it will not be caused by a gas leak. ! ! ! Harm can be kept to a minimum.

This invention is not limited to the above-described embodiment, and can be modified in various ways without departing from the gist of the invention.

For example, although nitrogen gas was used as the inert gas in the above-described embodiments, the same effect can be obtained by using other inert gases such as argon gas (Ar).

A photo master and a measuring roll were used to detect the position of the steel material and control the inert gas supply stage. A similar effect can be obtained by detecting the position of .

In this case, the photo masters are arranged at at least two locations and command the inert gas injection nozzles to eject and stop.

Alternatively, the same effect can be obtained by supplying and stopping inert gas sequentially from the nozzles in each region at different times depending on the conveyance speed of the steel material, without using a photo master to detect the steel material. I can do it.

[Effects of the Invention] According to the present invention, the transport table for transporting the metal material is filled with an inert gas atmosphere. Therefore, since the metal material is not brought into contact with the large island during transportation, it is possible to prevent scale from forming on the surface of the metal material. Therefore, the yield of gold 3 materials due to scale loss can be improved. Moreover, the inside of the inert gas chamber is divided into multiple regions by an inert gas curtain, and each region in the chamber is sequentially filled with inert gas according to the progress of the metal material. You can save money.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conveyance table according to an embodiment of the invention, and FIG. 2 is a schematic plan view of the conveyance table shown in FIG. 1. DESCRIPTION OF SYMBOLS 10... Conveyance table, 16... Chamber plate, 24... Inert gas supply nozzle, 26... Inlet side injection nozzle, 27... Inlet gas curtain, 32A...
・First area, 32B...Second area, 32C...
Third region, 34... divided gas curtain, 38A13
8B... Ruri Xu ■ Recording Te.

Claims (1)

[Claims] A table roller arranged along a conveyance path for conveying a metal material, a chamber plate that covers the metal material conveyed on the table roller, an inert gas supply means for filling the chamber with an inert gas, a dividing means for dividing the inside of the chamber into a plurality of regions by injecting gas in layers to form a gas curtain; A conveying table for metal materials, comprising: a control means for controlling an inert gas supply means.