KR20030092367A - Device for cleaning hearth roll in annealing furnace - Google Patents

Abstract

PURPOSE: An apparatus for cleaning the surface of hearth rolls inside annealing furnace is provided to smoothly perform continuous operation that is one of features of continuous line by reducing time required for drawing out the hearth rolls, charging the hearth rolls again and cleaning the rolls. CONSTITUTION: The apparatus for cleaning the surface of hearth rolls inside annealing furnace(10) comprises operating hearth roll(20) and spare hearth roll(21) installed in the annealing furnace; a roll change part comprising a body of revolution(22) which is rotationally installed inside the annealing furnace with being put on in a width direction of strip(150), and at both sides of which the two hearth rolls are installed around rotation shaft, and driving motor(23) connected to the body of revolution to rotate the body of revolution so that the operating hearth roll and spare hearth roll are exchanged as occasion demands; and a cleaning part comprising operation stand(30) an upper part of which is rotationally installed on the inner wall of the annealing furnace so that the operation stand is horizontally rotated to the side of the spare hearth roll, driving cylinder(31) connected to the annealing furnace and operation stand to rotate the operation stand, and grinding cloth(32) longitudinally installed on the operation stand and closely adhered to the surface of the spare hearth roll to clean the surface of the spare hearth roll so that the surface of exchanged hearth roll is cleaned.

Description

Device for cleaning hearth roll in annealing furnace

The present invention relates to a continuous annealing pickling process in a stainless steel hot rolling process, and more particularly, to an apparatus for cleaning a hearth roll surface of an annealing furnace for quickly withdrawing a hearth roll inside a continuous annealing furnace to clean foreign substances on the roll surface. .

In general, in order to produce a stainless steel hot coil is subjected to an annealing process of heating the strip temperature to the target temperature (1095 ℃). Annealing is intended to facilitate cold working by recrystallizing the processing structure formed during hot rolling to remove internal stress, and to solidify carbides formed during hot rolling to secure corrosion resistance and improve descaling properties.

Annealing furnaces used for annealing work are divided into batch type and continuous type. Currently, continuous annealing furnace for mass production is mainly used. The continuous annealing furnace has a heating zone, a cracking zone, and a slow cooling zone in one furnace, and the strip is sequentially passed through the furnace to complete annealing.

The continuous annealing furnace is formed in a horizontal direction so that the strip enters the entrance side, and a hearth roll is installed inside the inlet to support the strip, and a heating tube extends up and down the strip between the hearth roll and the hearth roll. Has a structure.

However, the scale peeled from the strip surface during passing through the annealing furnace is caused to adhere to the surface of the ceramic roll inside the annealing furnace due to the vortex and backflow in the furnace.

The scale attached to the ceramic roll heated to a high temperature is completely stuck to the ceramic roll surface while being in contact with the strip, thereby causing a flaw in the strip surface and adversely affecting the strip surface quality.

When this problem occurs, remove the ceramic roll completely from the annealing furnace, and then cool the roll using a cooling fan to peel off the scale, foreign matter, chips, etc. attached to the ceramic roll, and the operator uses a wire brush or sand paper. Various scales and foreign substances peeled off the roll surface are removed.

However, the prior art has a problem that the operator takes a lot of time to clean the surface of the roll to significantly reduce the productivity, causing contamination of another roll to shorten the roll life due to the reduction of the diameter of the roll.

In addition, since it takes a long time to remove and charge the roll, the atmosphere temperature inside the furnace is the main cause of the hunting, which results in poor quality, such as bare metal, annealing scale on the strip surface.

Accordingly, the present invention has been made in order to solve the above problems, by reducing the time required to take out and re-load the hearth roll and roll cleaning of the annealing furnace that can be performed smoothly continuous operation of the characteristics of the continuous line The object is to provide a hearth roll surface cleaning apparatus.

1 is a perspective view showing a state in which a hearth roll surface cleaning apparatus is installed in an annealing furnace according to the present invention;

Figure 2 is a perspective view of a part of the hearth roll surface cleaning apparatus according to the present invention,

3 and 4 are cross-sectional views of FIG. 3 in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

10: annealing furnace 20,21: hearth roll

22: rotating body 23: drive motor

24: operating motor 25: sensing piece

26: proximity sensor 30: worktable

31: driving cylinder 32: abrasive cloth

33: felt 40: moving car

42: guide groove 43: cylinder housing

44: piston 45,46: air pipe

47,48: Distribution hole 49,50: Supply valve

51,52: discharge valve 60: ramp

61 suction pipe 62 suction hole

The present invention for achieving the above object, in the annealing furnace, a work alternate roll and a preliminary hull roll installed in the annealing furnace, a roll alternating portion for replacing the work hull roll and the preliminary hull roll as necessary, the replaced hearth And a cleaning part for cleaning the surface of the roll.

Accordingly, it is possible to perform a surface cleaning operation of the replaced hearth roll during the continuous annealing operation by replacing the working work roll and the preliminary heart roll.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a state in which a hearth roll surface cleaning apparatus is installed in an annealing furnace according to the present invention, FIG. 2 is a perspective view of a part of the hearth roll surface cleaning apparatus according to the present invention, and FIGS. 3 and 4 illustrate the present invention. 3 is a cross-sectional view of FIG.

According to the above drawings, the present embodiment replaces the work hull roll 20 and the preliminary hull roll 21, the work hull roll 20 and the preliminary hull roll 21 installed in the annealing furnace 10 as necessary. Roll alternating portion for cleaning, and a cleaning portion for cleaning the surface of the replaced hearth roll.

Here, the work hull roll 20 refers to a hearth roll which is in contact with the lower strip 150 and is carrying out the strip 150 transfer operation, and the preliminary hull roll 21 is not involved in the annealing work and is to be put into the next work. It means a hearth roll preparing to be able to.

The two hearth rolls 20 and 21 are placed in the width direction of the strip 150 inside the annealing furnace 10, and when one hearth roll is in operation, the other hearth roll is released from the strip 150 and waits.

The roll alternate part for alternating these two hearth rolls is rotatably installed in the width direction of the strip 150 inside the annealing furnace 10, and two hearth rolls 20 and 21 are rotated 180 degrees about the rotation axis. Rotor 22 is rotatably installed, and is connected to the axis of the rotary body 22 includes a drive motor 23 for rotating the rotary body 22.

An operation motor 24 for rotating the hearth roll is installed on the rotation shafts of the two hearth rolls 20 and 21.

The rotating body 22 has a cylindrical shape and a groove having an arc-shaped cross section is formed in the longitudinal direction on the outer circumferential surface so that the hearth rolls 20 and 21 can be installed.

Therefore, the hearth rolls 20 and 21 installed in the grooves may be exposed to the lower part of the strip 150 by exposing a part of the hearth roll to the outside of the rotor 22.

According to the structure described above, if the work hull roll 20 installed on the rotating body 22 is located directly below the strip 150, the preliminary hull roll 21 is located on the opposite side of the axis of the rotating body 22 to perform roll cleaning. Will receive.

In this case, in order to precisely rotate the rotor 22, that is, each hearth roll 20, 21 is accurately positioned below the strip 150, the sensing piece 25 is installed on one side of the rotor 22 and the annealing furnace is provided. The inside of the 10 is provided with a proximity sensor 26 for detecting the sensing piece 25 to control the drive motor 23 in accordance with the signal of the proximity sensor 26.

On the other hand, the roll cleaning unit is replaced to clean the surface of the preliminary hull roll 21 located in the lower portion of the rotating body 22, the upper end is rotatably installed on the inner wall of the annealing furnace 10 is the preliminary huss The worktable 30 horizontally rotated toward the roll 21, the annealing furnace 10, and the driving cylinder 31 for rotating the worktable 30 and installed in the longitudinal direction on the worktable 30 are connected to the worktable 30. It is installed to be in close contact with the surface of the preliminary hearth roll 21 includes a polishing cloth 32 for cleaning the surface.

Therefore, when the work bench 30 is lifted according to the operation of the driving cylinder 31, the polishing cloth 32 is in close contact with the preliminary hull roll 21, and in this state, the preliminary hub roll 21 is rotated to rotate the polishing cloth 32. The surface of the preliminary hearth roll 21 can be polished and cleaned.

In addition, according to the present embodiment, it is necessary to reciprocate the polishing cloth 32 along the preliminary hull roll 21 to evenly polish the surface of the preliminary heart roll 21, and to properly discharge the foreign matter such as the polished scale. Therefore, for this purpose, the present invention may further include a polishing cloth 32 moving means and foreign matter discharge means.

The movement means of the polishing cloth 32 is a wheel 41 is installed at the bottom sliding along the guide groove 42 formed in the longitudinal direction of the work table 30, the mobile car is provided with the polishing cloth 32 on the upper surface 40 and drive means connected to the mobile car 40 for reciprocating the mobile car 40.

Reference numeral 33, which is not described herein, is a felt installed inside the polishing cloth 32 to impart an appropriate amount of cushion to the polishing cloth 32.

The drive means may be a drive cylinder or drive motor capable of linear movement of the piston rod and a rack, pinion, etc. for converting the rotational movement of the drive motor shaft to linear movement,

In the present embodiment, in the air driven manner, that is, the cylinder housing 43 installed inside the moving car 40 and the cylinder housing 43 and installed in the center of the groove 42 of the work table 30. Piston 44 which is located, the air pipes 45 and 46 fixedly installed at both ends of the piston 44 and extending to the worktable 30 through both ends of the cylinder housing 43 and supplied with air therein, Distribution holes 47 and 48 which are installed in communication with the air pipes 45 and 46 and the piston 44 into the air pipes 45 and 46, and are provided on one side of each of the air pipes 45 and 46, respectively. And air supply valves 49 and 50 and air discharge valves 51 and 52.

Accordingly, when the air is supplied to one air pipe 45 and 46 and the air is discharged to the opposite air pipe 46 and 45, the chambers of the cylinder housing 43 divided by the piston 44 are enlarged / reduced. The movable car 40 provided with the cylinder housing 43 moves with respect to 44.

In other words, the cylinder housing 43 is not fixed, the air pipes 45 and 46 serving as the piston rod are fixed, so that the movable car 40 moves in the direction opposite to the air input direction.

Here, the cylinder housing 43 and the movable car 40 through which the air pipes 45 and 46 penetrate have an airtight structure in which the air pipes 45 and 46 are kept tight, thereby preventing the leakage of air.

And the foreign matter discharge means is along the both sides of the ramp 60 is formed on both sides of the mobile car 40 around the polishing cloth 32, the guide groove 42 to which the mobile car 40 is guided It is installed and includes a suction pipe 61 for sucking the foreign matter flowed down the ramp 60, the suction hole 62 formed along the surface of the suction pipe 61.

Hereinafter will be described the operation of the present invention.

Two hearth rolls are used in the work hull roll 20 in the state of being installed on the rotating body 22 in the annealing operation, and the remaining preliminary hull roll 21 is located in the opposite direction to the work hull roll 20 and the surface. Cleaning work is in progress.

After a certain time or when the work hull roll 20 is replaced, the work hull roll 20 and the preliminary hull roll 21 are changed in position to proceed with annealing and the replaced work hull roll 20 performs a surface cleaning work. Will proceed.

That is, when the driving motor 23 is rotated, the rotating body 22 installed on the rotating shaft of the driving motor 23 rotates in one direction, and the work hull roll 20 and the preliminary hull roll installed on the rotating body 22 are rotated. The position of 21 is reversed.

At this time, when the rotating body 22 rotates exactly 180 degrees, the sensing piece 25 installed in the rotating body 22 is detected by the proximity sensor 26 installed in the annealing path 10 and the signal of the proximity sensor 26. In accordance with the drive motor 23 is to stop the rotation to accurately change the position of each hearth roll installed on the rotating body (22).

When the position of each of the hearth rolls 20 and 21 is reversed, a new hearth roll is introduced into the work to continue the strip 150, and the hearth roll moved under the rotating body 22 is started to clean the surface. do.

On the other hand, when looking at the surface cleaning operation of the preliminary hull roll 21, the work table 30 connected to the piston rod is rotated with respect to the annealing furnace 10 in accordance with the extension operation of the drive cylinder 31 is raised to a horizontal state As a result, the polishing cloth 32 provided on the work table 30 is brought into close contact with the surface of the preliminary hearth roll 21.

In this state, the operation motor 24 installed in the preliminary hull roll 21 is rotated to rotate the preliminary hull roll 21, and the preliminary hull roll 21 is a preliminary hull roll (according to the movement of the mobile car 40). Moving along the 21) to clean the scale by grinding the preliminary hearth roll 21.

That is, in FIG. 4, while closing the discharge valve 52 installed in the right air pipe 46 and opening the supply valve 50, the supply valve 49 installed in the left air pipe 45 is closed and the discharge valve ( When the 51 is opened, the air supplied through the right air pipe 46 is filled into the left chamber of the cylinder housing 43 through the distribution hole 48 and pushes the cylinder housing 43 against the piston 44. As a result, the movable car 40 in which the cylinder housing 43 is installed is moved to the right along the guide groove 42.

At this time, in the state in which air is not supplied into the left chamber of the cylinder housing 43, the air in the left chamber is discharged through the discharge valve 51 installed in the left air pipe 45 through the distribution hole 47.

Of course, when the upper angle valve is operated in reverse, the movable car 40 can be moved in the opposite direction.

As the mobile car 40 moves, the polishing cloth 32 installed on the mobile car 40 is able to evenly polish the entire surface of the preliminary hearth roll 21.

On the other hand, foreign matter such as scale dropped from the preliminary huss roll 21 by the polishing cloth 32 is dropped into the guide groove 42 along the inclined path 60 formed in the mobile car 40 and the suction pipe 61 installed in the guide groove. Discharge treatment to the outside of the guide groove 42 through the suction hole 62 of the).

As described above, according to the apparatus for cleaning the inner hearth roll surface of the annealing furnace according to the present invention, the replacement work of the hearth roll is made simple, thereby reducing the time and effort required for the replacement work.

In addition, the cleaning operation of the hearth roll can be made mechanically, thereby preventing the safety accident of the worker and reducing the time required for the work, thereby improving the productivity and quality.

Claims (4)

In the annealing furnace, A work hull roll and a preliminary hull roll installed in the annealing furnace; A rotating body placed in the strip width direction in the annealing furnace and rotatably installed, and having two hearth rolls installed at both sides about a rotating shaft, and a driving motor connected to the shaft of the rotating body to rotate the rotating body. Thus, a roll shift for replacing the work hull roll and preliminary hull roll as needed; A worktable having an upper end rotatably installed on the inner wall of the annealing furnace, the worktable being horizontally rotated toward the preliminary hustle roll, a drive cylinder connected to the annealing furnace and the workbench to rotate the workbench, and being installed in a longitudinal direction on the workbench to preliminary A cleaning unit for cleaning the surface of the replaced hearth roll, including a polishing cloth for cleaning the surface in close contact with the surface of the hearth roll; Internal hearth roll surface cleaning device of the annealing furnace comprising a. According to claim 1, a wheel is provided at the bottom sliding along the guide groove formed in the longitudinal direction of the workbench and the upper surface of the mobile car is provided with the polishing cloth, the driving means connected to the mobile car for reciprocating the mobile car Including, the inner hearthroll surface cleaning apparatus of the annealing furnace further comprises a moving means for moving the polishing cloth along the preliminary hussroll surface. 3. The driving means according to claim 2, wherein the driving means includes a cylinder housing installed inside the mobile car, a piston installed in the cylinder housing and positioned at the center of the groove of the work table, fixed at both ends of the piston, and both ends of the cylinder housing. An air pipe that extends through the workbench and is supplied with air to the inside, a distribution hole installed in communication with the air pipe at the connection portion of the air pipe and the piston, and an air supply valve and an air discharge valve installed at one side of each air pipe Internal hearth roll surface cleaning device of the annealing furnace comprising a. According to claim 1, wherein the inclined path formed on both sides of the mobile car with respect to the polishing cloth, and the foreign matter flowing down the slope is provided along both side edges of the guide groove in which the mobile car is guided And a suction pipe for suction, and a suction hole formed along the suction pipe surface, further comprising a foreign material discharge means for discharging foreign matter such as a polished scale.