KR100948917B1 - Device for pre-heating hearth roll in annealing furnace - Google Patents

Abstract

An object of the present invention is to provide a preliminary hearth roll preheating apparatus of the annealing furnace that can prevent the failure of the strip due to the temperature difference by preheating the preliminary hearth roll to be replaced at the appropriate temperature in advance.

Accordingly, the present invention is a rotary body placed in the strip width direction inside the annealing furnace rotatably installed, and two hearth rolls are rotatably installed at intervals of 180 degrees around the rotating shaft, and connected to the axis of the rotating body to rotate the rotor. A roll alternating portion for replacing the work hull roll being driven and the preliminary hull roll being prepared as needed, including a drive motor for rotating; It is provided in the inner hearthroll preheating apparatus of the annealing furnace located in the lower portion of the rotating body of the roll alternate portion and including a preheater for heating the preliminary hearthroll to an appropriate temperature.

Rotor, drive motor, moving cart, heating duct, hose, abrasive stone

Description

Device for pre-heating hearth roll in annealing furnace

1 is a side view showing a state in which a hearth roll preheating apparatus according to the present invention is installed in an annealing furnace,

2 is a perspective view of the hearth roll preheating apparatus according to the present invention;

3 is a perspective view showing the drive side of the hearth roll preheating apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10,11: hearth roll 20: rotating body

21: drive motor 40: rail

41: moving cart 42: vertical cylinder

43: heating duct 44: inlet hose

45: discharge hose 46: suction pump

49: thermometer 50: lifting member

51: Rack 52: Pinion Gear

53,55: working motor 54: abrasive stone

56: suction duct

The present invention relates to a continuous annealing pickling process in a stainless hot rolling process, and more particularly, to a hearth roll preheating device capable of preheating a preliminary hearth roll to be charged into a continuous annealing furnace at an appropriate temperature.

In general, in order to produce a stainless hot coil, an annealing process of heating the strip temperature to a target temperature (about 1095 ° C.) is performed. 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 the annealing.

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

Here, the hearth roll is a driving roll that maintains the horizontal shape of the strip at the bottom of the strip and supports the progress of the strip, and is generally used in pairs, which are alternately used. Each roll is annealed by the stretching operation of the vertical cylinder connected to the roll. They are alternately loaded inside the furnace to perform replacement operations and exchanges.

However, the above conventional structure causes a problem that the quality of the product is degraded by the temperature difference between the driving roll and the preliminary roll during roll replacement.

That is, in the related art, it is simply configured to alternate the preliminary hearth roll with the driving hearth roll. When the hearth roll, which is placed outside the annealing furnace and maintains the atmospheric temperature, is directly replaced by the driving roll and enters the inside of the annealing furnace, the preliminary hearth roll is replaced. The low temperature of the roll lowers the temperature of the strip, which causes a decrease in the quality of the product.

Therefore, the atmosphere temperature inside the furnace is the main cause of the hunting, which results in poor quality such as annealing and annealing scale on the strip surface.

In addition, when the roll in operation is damaged due to the high temperature heat inside the annealing furnace or the roll is replaced due to excessive use such as a cutting accident, foreign materials are attached to the surface of the roll and the roll mark The same fatal quality defects occur, and therefore, the production line has to be stopped and the rolls must be withdrawn to repair the surface of the rolls.

Accordingly, the present invention has been made to solve the above problems, by preheating the preliminary hearth roll to replace the hearth roll to an appropriate temperature in advance to preheat the inner hearth roll of the annealing furnace to prevent the failure of the strip due to the temperature difference The object is to provide a device.

It is another object of the present invention to provide an internal hearth roll preheating apparatus of an annealing furnace which is capable of removing the substance by heating the drawn hearth roll and simultaneously cleaning the surface of the roll.

The present invention for realizing the above object, the roll shift portion for replacing the driving work hull roll and the preliminary hull roll being prepared, if necessary, is installed in the roll shift to heat the preliminary hull roll to an appropriate temperature. It includes a preheating unit for.

Here, the preheating unit preferably uses an atmosphere gas inside the annealing furnace as a heat source for preheating the hearth roll.

In addition, the present invention further includes a polishing unit which is capable of removing foreign matter by polishing the surface of the roll.

Accordingly, after preheating the preliminary hearth roll, it is possible to replace the work hull roll.

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

1 is a side view showing a state in which a hearth roll preheating apparatus according to the present invention is installed in an annealing furnace, FIG. 2 is a perspective view of a hearth roll preheating apparatus according to the present invention, and FIG. 3 is a view of another hearth roll preheating apparatus according to the present invention. It is a perspective view which shows the drive part side.

According to the above-described drawings, the present invention requires a work hull roll 10 located in the annealing furnace and a preliminary hull roll 11, a work hull roll 10 and a preliminary hull roll 11 located outside the annealing furnace. Roll replacement parts for replacement accordingly, and the preheating part for heating the preliminary hearth roll 11 to an appropriate temperature is located in the lower portion of the preliminary hearth roll (11).

Here, the work hull roll 10 refers to a hearth roll which is in contact with a strip lower portion and is carrying out a strip conveying operation, and the preliminary hearth roll 11 is not involved in annealing but is prepared to be put into the next work. Means roll.

The two hearth rolls 10 and 11 are placed in the strip width direction in and out of the annealing furnace. When one hearth roll is in operation, the other hearth roll is released from the strip and waits.

Rotating body 20, the roll alternate portion for alternating these two hearth rolls are placed rotatably in the strip width direction inside the annealing furnace and rotatably installed at two rotational angles about 180 degrees around the axis of rotation. And a driving motor 21 connected to the shaft of the rotating body 20 to rotate the rotating body 20.

The rotating body 20 is formed in 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 10 and 11 may be installed.

Therefore, the hearth roll installed in the groove may be exposed to the lower surface of the strip by exposing a part of the hearth roll to the outside of the rotor 20.

The drive motor 21 is installed on a separate support block 22, the sprocket wheel 23 is installed on the rotary shaft of the rotating body 20 and the drive shaft of the drive motor 21 are connected to the chain 24.

According to the structure described above, if the work hull roll 10 installed on the rotating body 20 is located directly under the strip, the preliminary heart roll 11 is located on the opposite side about the axis of the rotating body 20 and is preheated by the preheating part. do.                     

And the two hearth rolls are rotatable about the rotating body 20 itself, as shown in Figure 3, the drive motor 26 is installed on the bracket 25 installed on the side of the rotating body 20 and each The driving motors 26 are each connected to the rotation shaft of the hearth roll.

In this embodiment, the sprocket wheels 27 are installed on the rotation shafts of the drive motor 26 and the rotation shafts of the hearth rolls 10 and 11, respectively, and are connected to the chain 28.

In addition, the roll alternate portion further includes a cooling means for protecting the hearth roll and the rotor 20 from high heat, the cooling means is the main supply pipe 30 is installed through the rotating shaft of the rotor 20 And a plurality of coolant pipes 31 installed through the rotation shafts of the respective hearth rolls, a plurality of coolant pipes 32 installed in the lengthwise direction along the rotating body 20, and one side of the main supply pipe 30. And a connection hose 33 for supplying cooling water to each of the cooling water pipes 31 and 32.

The cooling water pipe 32 installed in the rotating body 20 is connected to the outlet of the main supply pipe 30 again via the connecting hose 33 at the opposite end of the rotating body 20 and passes through the rotating body 20. Coolant is to be sent out.

On the other hand, the preheating unit for heating the preliminary hearth roll 11 located in the lower portion of the rotating body 20, the rail 40 placed in the width direction of the annealing furnace on the floor of the facility and along the rail 40 Moving bogie 41, a vertical cylinder 42 installed on the top of the mobile bogie 41, and connected to the front end of the piston rod of the vertical cylinder 42, the upper portion is opened to open the preliminary hustle roll 11 Heating duct 43 of the semi-circular cross section covering, the inlet hose 44 connecting the inside of the annealing furnace and the bottom of the heating duct 43, the discharge hose 45 connecting the front end of the duct and the annealing furnace, the inlet hose (44) It is provided on one side and includes a suction pump 46 for forcibly circulating the atmosphere gas.

Therefore, the high-temperature atmosphere gas inside the annealing furnace is circulated to the heating duct 43 through the inlet hose 44 to heat the preliminary hull roll 11 located in the heating duct 43.

Unexplained reference numerals (47) and (48) are connected to one wheel and a wheel that is installed on the moving cart (41) and placed on the rail (40) to move the moving cart (41) on the rail (40). It is a driving motor for rotating the wheels.

On the other hand, the present invention further includes a polishing unit for polishing the surface of the preliminary hus roll (11), the polishing unit is a lifting member 50, which is installed in the guide groove formed in the upper portion of the movable cart (41), The rack 51 formed on one side of the elevating member 50 in the vertical direction, the pinion gear 52 meshed with the rack 51, and the moving cart 41 are installed to rotate the pinion gear 52. An operating motor 53 to rotate, an abrasive stone 54 rotatably installed on the elevating member 50, an operation motor 55 for rotating the abrasive stone 54 at high speed, and an outer side of the abrasive stone 54. Suction duct 56 is installed to suction and remove foreign substances discharged during polishing.

Hereinafter will be described the operation of the present invention.

Two hearth rolls 10 and 11 are used in the work hull roll 10 in the state of being installed on the rotating body 20 in the annealing operation, and the other preliminary hull roll 11 is half of the work hull roll 10. Located in the opposite direction, surface cleaning and preheating are performed.

After a predetermined time or when the work hull roll 10 is replaced, the work hull roll 10 and the preliminary hull roll 11 are changed in position to proceed with annealing, and the replaced work hull roll 10 has a surface cleaning work. Preheating will proceed.

Preheating operation is composed of the atmosphere gas of the annealing furnace, when the moving cart 41 is moved below the rotating body 20 along the rail 40, the heating duct 43 installed on the upper part of the moving cart 41 is a preliminary hull. It is located under the roll (11).

In this state, the vertical cylinder 42 installed on the upper portion of the moving cart 41 is extended to lift the heating duct 43 upward, and the heating duct 43 having an open upper portion surrounds the preliminary hull roll 11.

In this state, the suction pump 46 is operated to introduce high-temperature atmosphere gas inside the annealing furnace into the heating duct 43 through the inlet hose 44, and the atmosphere gas is a preliminary hull roll located inside the duct 43. (11) is heated and recirculated into the annealing furnace along the discharge hose 45 installed on the side.

Therefore, the preliminary hearth roll 11 is preheated to a proper temperature by a high-temperature atmosphere gas, and the suction pump 46 is controlled to operate through a thermometer 49 installed at one side of the heating duct 43, thereby heating the inside of the heating duct 43. The temperature of is kept constant.

When the driving motor 21 is rotated while the preliminary hearth roll 11 is preheated as described above, the rotating body 20 installed on the rotating shaft of the driving motor 21 rotates in one direction and is installed on the rotating body 20. The position of the work hull roll 10 and the preliminary hull roll 11 is reversed.                     

When the position of each hearth roll is reversed, the preliminary heart roll 11 is newly introduced into the annealing operation. As described above, the preliminary heart roll 11 is already preheated to an appropriate temperature so that the temperature decrease due to the roll replacement does not occur. .

On the other hand, the hearth roll replaced and moved under the rotor 20 starts surface cleaning operation.

Looking at the surface cleaning operation of the preliminary hearth roll 11, when the operating motor 53 installed on the upper portion of the moving cart 41 is rotated, the pinion gear 52 is installed on the shaft of the operating motor while the pinion gear 52 is rotated. The elevating member 50 installed through the rack 51 is lifted up.

When the abrasive stone 54 installed on the elevating member 50 comes into contact with the preliminary hull roll 11, the operating motor 53 is stopped and the operating motor 55 installed on the elevating member 50 is rotated to polish the abrasive stone ( 54) to rotate at high speed.

In this state, the moving cart 41 moves slowly along the rail 40.

Therefore, the abrasive stone 54 which rotates at a high speed polishes the entire surface of the preliminary heart roll 11 while moving along the moving cart 41 in the longitudinal direction of the preliminary heart roll 11.

The foreign matter adhering to the surface of the preliminary hearth roll 11 is removed and the roll surface can be evened.

On the other hand, foreign matter such as scale dropped from the preliminary hus roll 11 by the abrasive stone 54 is sucked through the suction duct 56 provided on one side of the elevating member 50 is discharged to the outside.

 As described above, according to the internal hearth roll preheating apparatus of the annealing furnace according to the present invention, the hearth roll introduced into the annealing furnace can be preheated to an appropriate temperature in advance, thereby preventing deterioration of the strip caused by the temperature difference between the rolls. You can do it.

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 (3)

Rotating body which is placed in the strip width direction inside the annealing furnace to be rotatable, and two hearth rolls are rotatably installed at intervals of 180 degrees around the rotating shaft, and is connected to the axis of the rotating body to drive the rotating body. A roll alternating portion for replacing a working hull roll in operation and a preliminary spare roll in preparation, including a motor; Located in the lower portion of the rotating body of the roll alternate portion includes a preheater for heating the preliminary hearth roll to an appropriate temperature, The preheating unit is connected to a rail placed in the width direction of the annealing furnace at the bottom of the facility, a moving trolley traveling along the rail, a vertical cylinder installed at the upper side of the moving trolley, and a piston rod end of the vertical cylinder, and an upper portion thereof is opened. Heating duct of semicircular cross section covering the preliminary hull roll, an inlet hose connecting the inside of the annealing furnace and the bottom of the heating duct, an outlet hose connecting the front end of the duct and the annealing furnace, and an inlet hose installed at one side Internal hearth roll preheating apparatus of the annealing furnace comprising a suction pump for forced circulation. delete According to claim 1, The elevating member is installed to be lowered in the guide groove formed in the upper portion of the mobile bogie, Rack formed in a vertical direction on one side of the elevating member, Pinion gear to be fitted to the rack, The upper portion of the mobile bogie Operation motor for rotating the pinion gear, abrasive stone rotatably installed on the elevating member, operation motor for rotating the abrasive stone at high speed, and installed to the outside of the abrasive stone to suck and remove foreign substances discharged during polishing An inner hearth roll preheating apparatus of the annealing furnace, further comprising a polishing unit including a suction duct to polish the surface of the roll and remove foreign substances.

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