JP4878500B2 - Steel plate manufacturing equipment - Google Patents

Description

The present invention is a steel plate manufacturing apparatus, and particularly relates to combined apparatus for manufacturing a cold rolled steel plate and hot dipping steel plate can be produced by switching the cold rolled steel plate and hot-dipping steel plate.

Recently, hot dipping steel plate manufacturing apparatus for high-grade steel plate for large lots built, along with this, proposed is a waste却又the old device instead of being idle, to produce a cold-rolled steel plate by utilizing the device Has been made.

For example, Patent Document 1-5, as shown in FIG. 6, a hot dipping route R1 for producing molten plated steel plate 102a by feeding the steel plate 102 emerging from the annealing furnace 101 to melt the plating tank 103, the cold-rolled route R2 to produce a cold-rolled steel sheet 102b steel plate 102 emerging from the annealing furnace 101 without passing through the molten coating bath 103 crossed, the route switching furnace shell unit 104 to switch the route to the intersection What is provided is disclosed. As shown in FIG. 7, the route switching furnace shell unit 104 is provided such that a vertical furnace shell 104a and a horizontal furnace shell 104b are integrally joined and can be reciprocated in the horizontal direction by a slide carriage or the like. When switching to the hot dipping route R1, as shown in FIG. 6 (a), the vertical furnace shell 104a is connected to the hot dipping route R1, and when switching to the cold rolling route R2, as shown in FIG. 6 (b). The horizontal furnace shell 104b is connected to the cold rolling route R2. Furthermore, in the hot dipping route R1 between the route switching furnace shell unit 104 and the hot dipping bath 103, as shown in FIG. 8, a hot dipping in which an alloying furnace 105a, a minimum spangler 105b, and a rapid cooling device 105c are integrally joined. steel plate for a furnace shell unit 105 is movable in a horizontal direction, which enables switching in accordance with the type of steel plate to be manufactured.
JP 2003-27199 A JP 2003-251410 A Japanese Patent Laid-Open No. 2003-253412 JP 2004-27340 A JP 2004-176109 A

However, the proposed steel plate manufacturing apparatus in the patent literature, as shown in FIG. 6, because the route switching furnace shell unit 104 is provided separately from the molten plated steel plate furnace shell unit 105, the route switching furnace There is a problem that a support frame and rails dedicated to the shell unit 104 and devices such as a drive device, a positioning device, and a position detector are required, and the frame becomes complicated.

Further, in the apparatus for manufacturing the alloyed galvanized steel plate, the hot dipping route rising from hot dipping tank holds a plating layer of the molten plated alloy to a temperature in the alloying furnace for alloying, the predetermined time alloy held A belt is provided. In this device, when manufacturing cold rolled steel plate, but it is also unnecessary security band also alloying furnace, the production of cold rolled steel plate is required means for slow cooling or cooling the steel plate leaving the annealing furnace Therefore, there is a problem that the cold rolling route is complicated and expensive.

The present invention aims to provide a combined apparatus for manufacturing a cold rolled steel plate and hot dipping steel plate that can be switched molten plating routes and cold route with a simple structure.
Another object is to provide a combined apparatus for producing slow cooling or structure simple cold rolled steel plate of cold rolled routes be used also as the cooling zone and the molten plated steel plate of cold rolled root retention zone of the molten coating Route And

In order to solve the above problems, the invention of claim 1
A hot-rolling route for producing a hot-dip galvanized steel sheet by introducing the steel sheet carried out of the annealing furnace into the hot dipping bath, and a cold-rolled steel sheet being bypassed without introducing the steel plate taken out of the annealing furnace into the hot dipping bath. In steel sheet manufacturing equipment that can switch between cold rolling routes,
In the hot dipping route that rises from the hot dipping bath, a hot shell unit with a hot dipping route furnace shell extending vertically and a cold dipping route furnace shell extending vertically is provided so as to be movable in the horizontal direction.
The furnace shell for the hot dipping route is an alloying furnace, or a plurality of furnace shells including the alloying furnace, and a furnace that can be selected in parallel with the moving direction of the furnace shell unit. Made of shells,
In the hot dipping route, the furnace shell unit is moved to one side so that the hot shell for the hot dipping route matches the hot dipping route,
When switching to the cold rolling route, move the furnace shell unit to the other, connect the cold rolling route bypassing the hot dipping bath to the lower end of the furnace shell for the cold rolling route, and the subsequent cold rolling route at the upper end. Are connected.

The invention of claim 2, the cold rolled root furnace shell of the furnace shell unit, in which a cooling device for cooling the steel plate is unloaded from the annealing furnace.

The invention of claim 3
And hot dipping route producing molten plated steel plate was introduced into the hot dipping bath the steel plate is unloaded from the annealing furnace, the steel plate is unloaded from the annealing furnace and bypass without introducing the hot dipping bath cold-rolled steel can switch between cold route for producing the plate, in the steel plate manufacturing apparatus and a security band and alloying furnace provided hot dipping route which rises from the hot dipping bath,
In the hot dipping route, the alloying furnace and holding band are used,
When switching to a cold rolling route, a cold rolling route bypassing the hot dipping bath is connected upstream of the holding zone, a subsequent cold rolling route is connected downstream of the holding zone, and the holding zone is cooled. It is also used as the slow cooling zone or cooling zone of the extended route.

The invention of claim 4
A furnace shell unit provided with a furnace shell for a hot dipping route and a furnace shell for a cold rolling route made of the alloying furnace is provided so as to be movable in the horizontal direction,
In the hot dipping route, the furnace shell unit is moved to one side, the hot shell for the hot dipping route made of the alloying furnace is matched with the hot dipping route, and the alloying furnace and the holding zone are used.
When switching to the cold rolling route, move the furnace shell unit to the other, connect the cold rolling route bypassing the hot dipping bath to the lower end of the furnace shell for the cold rolling route, and connect the holding band to the upper end. The holding band is also used as the slow cooling zone or the cooling zone of the cold rolling route.

According to the invention of claim 1, since the cold rolling route shell is integrally joined with at least a hot dipping route shell made of an alloying furnace, the selection is the same as the selection of the alloying furnace in the hot dipping route. The moving means can be switched to the cold rolling route, and the structure is simple. Further, it Frames moving means also can be used and existing hot-dip plating line, can be inexpensively provide a combined apparatus for manufacturing a cold rolled steel plate and hot-dipping steel plate.

  According to the invention of claim 2, it is not necessary to separately provide a cooling device at another part of the cold rolling route, and the structure is further simplified.

According to the invention of claim 3, since the holding zone of the hot dipping route is also used as the slow cooling zone or the cooling zone of the cold rolling route, the structure is simple, and the slow cooling zone or cooling zone to there is no need to separately provide, it is possible to inexpensively provide a combined apparatus for manufacturing a cold rolled steel plate and hot-dipping steel plate.

According to the invention of claim 4, it is possible to switch to the cold rolling route by the same moving means as the selection of the alloying furnace, minimum spangle device and quenching device in the hot dipping route, and the structure is simple. Further, it Frames moving means also can be used and existing hot-dip plating line, can be inexpensively provide a combined apparatus for manufacturing a cold rolled steel plate and hot-dipping steel plate.

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

<First Embodiment>
Figure 1 shows a steel plate manufacturing apparatus 1A according to the first embodiment of the present invention.
The steel plate manufacturing apparatus 1A on the downstream side of the annealing furnace 2, a hot dipping route R1 for producing molten plated steel plate 3a, provided with cold-rolled route R2 to produce a cold-rolled steel plate 3b without performing hot dipping It has been.

  As shown in FIG. 1A, the hot dipping route R1 descends obliquely by the guide roll 5 from the carry-out part 4 of the annealing furnace 2, enters the hot dipping bath 8 through the first outlet 6 and the snout 7, It rises upward by a pot roll 9 provided in the hot dipping bath 8, passes through a hot dipping route furnace shell 11 of the switching furnace shell unit 10, and further enters an inverted U-shaped upper furnace shell 12, and guide rolls 13, 14 is a route that descends by 14 and enters the water cooling tank 15, rises upward by a pot roll 16 provided in the water cooling tank 15, and passes horizontally through a draining device 17 and by a guide roll 18.

  As shown in FIG. 1B, the cold rolling route R2 goes straight from the second outlet 19 of the carry-out portion 4 of the annealing furnace 2 and enters the cold rolling route furnace shell 20 of the switching furnace shell unit 10, The inside of the rolling route furnace shell 20 is raised by the guide roll 21, further horizontally directed by the guide roll 22, exits the cold rolling route furnace shell 20, passes through the cold rolling route fixed shell 23, and passes through the upper furnace shell. 12, descends by the guide roll 24, enters the water cooling tank 15, rises upward by the pot roll 16 provided in the water cooling tank 15, and passes through the draining device 17. The route is directed horizontally by the guide roll 18. Instead of going straight from the second outlet 19 of the carry-out part 4 of the annealing furnace 2, it may be allowed to go upward and then horizontally enter the cold-rolling route furnace shell 20 of the switching furnace shell unit 10.

As shown in FIG. 2, the switching furnace shell unit 10 is provided with a hot-melting route furnace shell 11 extending in the vertical direction and a cold-rolling route furnace shell 20 extending in the vertical direction. It can be reciprocated in a horizontal direction on a pair of rails 26. The cold-rolling route furnace shell 20 includes a vertical portion 20a, a lower horizontal portion 20b bent in the horizontal direction from the lower end of the vertical portion 20a, and an upper portion bent in the horizontal direction opposite to the lower horizontal portion 20b from the upper end of the vertical portion 20a. It consists of a horizontal part 20c. The vertical portion 20a cooler 27 is provided for cooling the cold rolled steel plate 3b to pass through the inside. As the cooling device 27, a system in which the gas cooled by the gas cooler is forcibly circulated by a fan is preferable. As shown in FIG. 1B, guide rolls 21 and 22 are respectively disposed between the upper and lower horizontal portions 20b and 20c and the vertical portion 20a. As shown in FIG. 2, the hot-dipping route furnace shell 11 includes an alloying furnace 11a, a minimum spangler 11b, and a quenching device 11c.

A door 28 that opens and closes an outlet toward the snout 7 is provided in the carry-out portion 4 of the annealing furnace 2. This door 28 is not absolutely necessary because it can be sealed in the hot dipping bath 8. However, if the door 28, it is possible to maintain the hot dipping bath 8 at cold rolled steel plate manufacturing. Further, a door 29 that opens and closes the hot dipping route R1 is provided at a portion where the fixed furnace shell 23 for the cold rolling route joins the upper furnace shell 12.

  Between the lower horizontal part 20b of the cold-rolling route furnace shell 20 of the switching furnace shell unit 10 and the second outlet 19 of the carry-out part 4 of the annealing furnace 2, a connection unit 30 for airtight connection between them is mounted. It is like that. Similarly, a connection unit 31 is installed between the upper horizontal portion 20c of the cold-rolling route furnace shell 20 and the cold-rolling route fixed furnace shell 23 in an airtight manner. Arbitrary means such as bolts, clamps, and cylinders can be adopted as connection means for these connection units 30 and 31.

In operation of the steel plate manufacturing apparatus comprising the configuration, first, the molten plating route R1, as shown in FIG. 1 (a), moves the switching furnace shell unit 10 in the horizontal direction, molten plating route furnace shell alloying furnace 11a of 11, one of the minimum spangle device 11b and quenching device 11c match on hot dipping route R1 and selected according to the type of steel plate. Moreover, the door 28 of the 1st exit 6 of the carrying-out part 4 of the annealing furnace 2 is opened, and the door 29 of the upper furnace shell 12 is opened. Steel plate 3 that has been annealed in the annealing furnace 2, up to about 460 ° C. In the case of zinc plating, in the case of aluminized to about 670 ° C., 55% aluminum, temperatures up to about 600 ° C. In the case of zinc 45% plating In this state, it passes through the snout 7 via the guide roll 5 and is immersed in a hot dipping solution in a hot dipping bath 8 where hot dipping such as zinc or aluminum is applied. Molten plated steel plate 3a which is melted plated raised by a pot roll 9 in the hot dipping bath 8, the alloying furnace 11a of the molten plating root furnace shell 11, a selected one of the minimum spangle device 11b and quenching device 11c Processed through the furnace shell. In alloying furnace 11a, a steel plate 3a which is melted plated is heated to about 520 to about 550 ° C., the plating layer is alloyed. In Minimum spangle device 11b, the steel plate 3a which is melted plated is sprayed zinc powder or chemical, spangle plating surface (flower pattern) are reduced. The quenching device 11c is mainly used for aluminum plating. In the quenching apparatus 11c, quenched steel plate 3a which is melted plating about 11 ° C. / sec or faster, about 450 ° C. In the case of aluminum plating, 55% aluminum, up to about 370 ° C. In the case of zinc 45% plating As a result, the spangle is reduced. Molten plated steel plate 3a processed by hot dipping root furnace shell 11 is cooled to about 0.99 ° C. while passing through the upper furnace shell 12 after being further cooled by the water cooling tank 15, conveyed to the next step, not shown Is done.

In order to switch to the cold rolling route R2, as shown in FIG. 1B, the switching furnace shell unit 10 is moved in the horizontal direction, and the cold rolling route furnace shell 20 is made to coincide with the cold rolling route R2. Moreover, the door 28 of the 1st exit 6 of the carrying-out part 4 of the annealing furnace 2 is obstruct | occluded, and the door 29 of the upper furnace shell 12 is obstruct | occluded. Then, a connection unit 30 is mounted between the lower horizontal portion 20b of the cold rolling route furnace shell 20 and the second outlet 19 of the discharge portion 4 of the annealing furnace 2, and the upper horizontal portion 20c and the cold rolling route fixed furnace shell. The connection unit 31 is also mounted between the terminal 23 and the terminal 23. Steel plate 3 that has been annealed by the annealing furnace 2 straight, enters the lower horizontal portion 20b of the cold rolled root furnace shell 20 via the connection unit 30, it is raised to the vertical portion 20a by the guide roll 21, cooling here Cooled by device 27. Cooled cold-rolled steel plate 3b is a guide roll 22 moved to the upper horizontal portion 20c, the connection unit 31, enters the cold rolled root fixed furnace shell 23, cooled to about 0.99 ° C. while lowering the upper furnace shell 12 Then, after further cooling in the water cooling tank 15, it is transported to the next step (not shown).

  In the first embodiment, the cold rolling route furnace shell 20 is integrally joined to the hot dipping route furnace shell 11 provided with the alloying furnace 11a, the minimum spangle device 11b, and the rapid cooling device 11c. For this reason, it becomes possible to switch to the cold rolling route R2 by the same moving device as the moving device for selecting the alloying furnace 11a, the minimum spangle device 11b and the rapid cooling device 11c in the hot dipping route R1, and the structure is simple. is there. Moreover, the support frame 25 and the rail 26 of the existing hot dipping route R1 can be used as the support frame 25 and the rail 26 which are moving means for route switching.

  Further, in the first embodiment, since the cooling device 27 is provided in the cold rolling route furnace shell 20 of the switching furnace shell unit 10, there is no need to separately provide a cooling device in another part of the cold rolling route R2. The structure becomes simple.

<Second Embodiment>
Figure 3 illustrates a steel plate manufacturing apparatus 1B according to a second embodiment of the present invention. In the second embodiment described below and its modifications, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

Even in this steel plate manufacturing apparatus 1B, a hot dipping route R1 for producing molten plated steel plate 3a on the downstream side of the annealing furnace 2, provided with cold-rolled route R2 to produce a cold-rolled steel plate 3b without performing hot dipping It has been.

  As shown in FIG. 3A, the hot dipping route R1 descends obliquely by the guide roll 5 from the carry-out part 4 of the annealing furnace 2, enters the hot dipping bath 8 through the first outlet 6 and the snout 7, It rises upward by a pot roll 9 provided in the hot dipping bath 8, passes through an alloying furnace 11 a and a holding band 32, further enters an inverted U-shaped upper furnace shell 12, and descends by guide rolls 13 and 14. It is a route that enters the water-cooled tank 15, rises upward by a pot roll 16 provided in the water-cooled tank 15, and passes horizontally through a drainer 17 and by a guide roll 18.

  As shown in FIG. 3 (b), the cold rolling route R2 rises by the guide roll 33 from the carry-out portion 4 of the annealing furnace 2, exits the second outlet 34, and bypasses the hot dipping bath 8. Entering the furnace shell 35, the inside of the cold rolling route bypass furnace shell 35 is horizontally directed by the guide roll 36, enters the holding band 32, is raised by the guide roll 37, is further horizontally directed by the guide roll 38, and the holding band 32 , Passing through the cold rolling route connection unit 39 and the cold rolling route fixed furnace shell 23 and entering the falling portion of the upper furnace shell 12, descending by the guide roll 24 and entering the water cooling tank 15. Similarly to R1, it is a route that rises upward by a pot roll 16 provided in the water-cooled tank 15 and goes horizontally by a guide roll 18 through a drainer 17.

  The alloying furnace 11a may be used alone or as a furnace shell unit provided with a minimum spangle device and a rapid cooling device as shown in FIG. In this case, the furnace shell unit is supported by the support frame 25 so as to be reciprocally movable on the pair of rails 26 in the horizontal direction.

Wherein the security band 32, the cooling device 40 is provided to cool the heaters 32a to hold the molten plated steel plate 3a by hot dipping route R1 at a constant temperature, the cold-rolled steel plate 3b in cold rolled route. As the cooling device 40, a system in which the gas cooled by the gas cooler 40a is forcibly circulated by the fan 40b is preferable. The security band 32 includes a temperature retaining function of the molten plated steel plate 3a by the heater 32a in the molten plating route R1, slow cooling or cooling and routes also serves as a cold rolled steel plate 3b by the cooling device 40 in cold route R2 It becomes.

As in the first embodiment, the unloading section 4 of the annealing furnace 2 is provided with a door 28 for opening and closing the first outlet 6 toward the snout 7. This door 28 is not absolutely necessary because it can be sealed in the hot dipping bath 8. However, if the door 28, it is possible to maintain the hot dipping bath 8 at cold rolled steel plate manufacturing. Further, a door 29 that opens and closes the hot dipping route R1 is provided at a portion where the fixed furnace shell 23 for the cold rolling route joins the upper furnace shell 12. The means for connecting the cold rolling route bypass furnace shell 35 to the holding band 32 and the unloading section 4 and the means for connecting the cold rolling route connection unit 39 to the holding band 32 and the cold rolling route fixed furnace shell 23 include bolts and clamps. Any means such as a cylinder can be employed.

Open Describing the operation of the steel plate manufacturing apparatus 1B made of the configuration, first, the molten plating route R1, as shown in FIG. 3 (a), a first door 28 of the outlet 6 of the delivery section 4 of the annealing furnace 2 Then, the door 29 of the upper furnace shell 12 is opened. Steel plate 3 that has been annealed by the annealing furnace 2, up to about 460 ° C. In the case of zinc plating, in the case of aluminized to about 670 ° C., 55% aluminum, temperatures up to about 600 ° C. In the case of zinc 45% plating In this state, it passes through the snout 7 via the guide roll 5 and is immersed in a hot dipping solution in a hot dipping bath 8 where hot dipping such as zinc or aluminum is applied. Steel plate 3a which is melted plated raised by a pot roll 9 in the hot dipping bath 8, passed through the alloying furnace 11a, where it is heated to about 520 to about 550 ° C., the plating layer is alloyed . Molten plated steel plate 3a processed by the alloying furnace 11a is cooled, a predetermined time by a heater 32a of the retaining band 32, after being maintained at about 520 to about 550 ° C., up to about 0.99 ° C. while passing through the upper furnace shell 12 Then, after further cooling in the water cooling tank 15, it is transported to the next step (not shown).

In order to switch to the cold rolling route R2, as shown in FIG. 3B, the door 28 of the first outlet 6 of the carry-out part 4 of the annealing furnace 2 is closed, and the door 29 of the upper furnace shell 12 is closed. . Further, a cold rolling route bypass furnace shell 35 is mounted between the lower part of the holding band 32 and the second outlet 34 of the discharge part 4 of the annealing furnace 2, and the upper part of the holding band 32 and the fixed furnace shell 23 for the cold rolling route. A cold-rolled route connection unit 39 is mounted between the two. Steel plate 3 that has been annealed in the annealing furnace 2 through a guide roll 33 enters the cold rolled root bypass furnace shell 35, enters the security band 32 is guided by the guide rolls 36, by using the cooling device 40 where And cooled. Cooled cold-rolled steel plate 3b is horizontally directed by guide rolls 38, cold-route connection unit 39, it enters the cold rolled root fixed furnace shell 23, is cooled to about 0.99 ° C. while lowering the upper furnace shell 12 After being further cooled in the water cooling tank 15, it is transported to the next step (not shown).

  In the second embodiment, since the holding band 32 of the hot dipping route R1 is also used as a slow cooling zone or a cooling zone of the cold rolling route R2, the structure is simple. Further, it is not necessary to separately provide a slow cooling zone or a cooling zone at other portions of the cold rolling route R2.

<Modification of Second Embodiment>
Figure 4 shows a steel plate manufacturing apparatus 1B 'according to a modification of the second embodiment. In the second embodiment, the cold rolling route bypass furnace shell 35 is mounted between the carry-out portion 4 of the annealing furnace 2 and the holding band 32. However, in this modification, the cold rolling route bypass furnace shell 41 is provided. Is a switching furnace shell unit 42 that is integrally joined together with the alloying furnace 11a, and this switching furnace shell unit 42 is supported by a support frame 25 and reciprocates horizontally on a pair of rails 26. It is possible.

  The cold rolling route bypass furnace shell 41 has an L-shape composed of a horizontal portion 41a and a vertical portion 41b, and a guide roll 43 is provided between the horizontal portion 41a and the vertical portion 41b. The alloying furnace 11a may be used alone, or as shown by a two-dot chain line in FIG. 5, a minimum spangler 11b and a rapid cooling device 11c may be provided.

  A connection unit 45 is connected between the horizontal portion 41a of the cold rolling route bypass furnace shell 41 and the second outlet 44 of the carry-out portion 4 of the annealing furnace 2 in an airtight manner. Similarly, a connection unit 46 is installed between the vertical portion 41 b of the cold rolling route bypass furnace shell 41 and the holding band 32 so as to connect them in an airtight manner. Arbitrary means such as bolts, clamps, and cylinders can be employed as connection means for these connection units 45 and 46.

In the operation of the steel plate manufacturing apparatus 1B according to the modification of the second embodiment ', firstly, the molten plating route R1, as shown in FIG. 4 (a), moves the switching furnace shell unit 42 in the horizontal direction The alloying furnace 11a is made to coincide with the hot dipping route R1. Moreover, the door 28 of the 1st exit 6 of the carrying-out part 4 of the annealing furnace 2 is opened, and the door 29 of the upper furnace shell 12 is opened. Steel plate 3 that has been annealed in the annealing furnace 2, up to about 460 ° C. In the case of zinc plating, in the case of aluminized to about 670 ° C., 55% aluminum, temperatures up to about 600 ° C. In the case of zinc 45% plating In this state, it passes through the snout 7 via the guide roll 5 and is immersed in a hot dipping solution in a hot dipping bath 8 where hot dipping such as zinc or aluminum is applied. Steel plate 3a which is melted plated raised by a pot roll 9 in the hot dipping bath 8, passed through the alloying furnace 11a, where it is heated to about 520 to about 550 ° C., the plating layer is alloyed . Molten plated steel plate 3a processed by the alloying furnace 11a is cooled, a predetermined time by a heater 32a in the holding zone 32, after being maintained at about 520 to about 550 ° C., up to about 0.99 ° C. while passing through the upper furnace shell 12 Then, after further cooling in the water cooling tank 15, it is transported to the next step (not shown).

In order to switch to the cold rolling route R2, as shown in FIG. 4B, the switching furnace shell unit 42 is moved in the horizontal direction, and the cold rolling route bypass furnace shell 41 is made to coincide with the cold rolling route R2. Moreover, the door 28 of the 1st exit 6 of the carrying-out part 4 of the annealing furnace 2 is obstruct | occluded, and the door 29 of the upper furnace shell 12 is obstruct | occluded. Further, between the horizontal portion 41a of the cold rolling route bypass furnace shell 41 and the second outlet 44 of the annealing furnace 2, and between the vertical portion 41b of the cold rolling route bypass furnace shell 41 and the holding band 32, the holding band. Connection units 45, 46, and 39 are mounted between the upper part of 32 and the fixed furnace shell 23 for the cold rolling route, respectively. Steel plate 3 that has been annealed by the annealing furnace 2, straight and exits the second outlet 44 enters the cold rolled root bypass furnace shell 41, enters the security band 32 is guided by the guide roll 43, wherein the cooling device 40 It is cooled using. Cooled cold-rolled steel plate 3b is horizontally directed by guide rolls 38, cold-route connection unit 39, it enters the cold rolled root fixed furnace shell 23, is cooled to about 0.99 ° C. while lowering the upper furnace shell 12 After being further cooled in the water cooling tank 15, it is transported to the next step (not shown).

  In the modification of the second embodiment, the cold rolling route bypass furnace shell 41 is integrally movable with the alloying furnace 11a and can be moved in the horizontal direction. Therefore, the alloying furnace 11a and minimum spangle in the hot dipping route R1 are provided. Switching to the cold rolling route R2 is possible by the same moving means as the selection of the apparatus 11b and the rapid cooling apparatus 11c, and the structure is simple. Moreover, the frame of the existing hot dipping route can be used for the moving means.

Front view of a hot dipping route (a) cold-rolled root (b) of the steel plate manufacturing apparatus according to a first embodiment of the present invention. The perspective view of the switching furnace shell unit of FIG. Front view of a hot dipping route (a) cold-rolled root (b) of the steel plate manufacturing apparatus according to a second embodiment of the present invention. Front view of a hot dipping route (a) cold-rolled root (b) of the steel plate manufacturing apparatus according to a modification of the second embodiment of the present invention. The perspective view of the switching furnace shell unit of FIG. Front view of a hot dipping route (a) cold-rolled root (b) of the conventional steel plate production apparatus. FIG. 7 is a perspective view of the route switching furnace shell unit of FIG. 6. Perspective view of a hot dipping steel plate furnace shell unit of FIG.

1A, 1B, 1B 'steel plate manufacturing apparatus 2 furnace 3 steel plate <br/> 3a molten plated steel plate 3b cold rolled steel plate 8 hot dipping bath 10 switching furnace shell unit 11 hot dipping root furnace shell 11a alloying furnace 11b Minimum Spangle Device 11c Rapid Cooling Device 20 Cold Rolling Route Furnace 27 Cooling Device 32 Retaining Band 35 Cold Rolling Route Bypass Shell 39 Cold Rolling Route Connection Unit 41 Cold Rolling Route Bypass Shell 42 Switching Furnace Unit R1 Hot Plating Route R2 Cold rolling route

Claims (4)

A hot-rolling route for producing a hot-dip galvanized steel sheet by introducing the steel sheet carried out of the annealing furnace into the hot dipping bath, and a cold-rolled steel sheet being bypassed without introducing the steel plate taken out of the annealing furnace into the hot dipping bath. In steel sheet manufacturing equipment that can switch between cold rolling routes,
In the hot dipping route that rises from the hot dipping bath, a hot shell unit with a hot dipping route furnace shell extending vertically and a cold dipping route furnace shell extending vertically is provided so as to be movable in the horizontal direction.
The furnace shell for the hot dipping route is an alloying furnace, or a plurality of furnace shells including the alloying furnace, and a furnace that can be selected in parallel with the moving direction of the furnace shell unit. Made of shells,
In the hot dipping route, the furnace shell unit is moved to one side so that the hot shell for the hot dipping route matches the hot dipping route,
When switching to the cold rolling route, move the furnace shell unit to the other, connect the cold rolling route bypassing the hot dipping bath to the lower end of the furnace shell for the cold rolling route, and the subsequent cold rolling route at the upper end. The steel plate manufacturing apparatus characterized by connecting. Cold rolled root furnace shell of the furnace shell unit, the steel plate manufacturing apparatus according to claim 1, characterized in that it comprises a cooling device for cooling the steel plate is unloaded from the annealing furnace. And hot dipping route producing molten plated steel plate was introduced into the hot dipping bath the steel plate is unloaded from the annealing furnace, the steel plate is unloaded from the annealing furnace and bypass without introducing the hot dipping bath cold-rolled steel can switch between cold route for producing the plate, in the steel plate manufacturing apparatus and a security band and alloying furnace provided hot dipping route which rises from the hot dipping bath,
In the hot dipping route, the alloying furnace and holding band are used,
When switching to a cold rolling route, a cold rolling route bypassing the hot dipping bath is connected upstream of the holding zone, a subsequent cold rolling route is connected downstream of the holding zone, and the holding zone is cooled. steel plate manufacturing apparatus characterized by also serves as the slow cooling zone or cooling zone of the extended root. A furnace shell unit provided with a furnace shell for a hot dipping route and a furnace shell for a cold rolling route made of the alloying furnace is provided so as to be movable in the horizontal direction,
In the hot dipping route, the furnace shell unit is moved to one side, the hot shell for the hot dipping route made of the alloying furnace is matched with the hot dipping route, and the alloying furnace and the holding zone are used.
When switching to the cold rolling route, move the furnace shell unit to the other, connect the cold rolling route bypassing the hot dipping bath to the lower end of the furnace shell for the cold rolling route, and connect the holding band to the upper end. to the steel plate manufacturing apparatus according to the security band to claim 3, characterized in that also serves as the slow cooling zone or cooling zone of the cold-rolled route.

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