JPH01230757A - Device for retreating sink roll in equipment for producing plated steel sheet and cold-rolled steel sheet - Google Patents

Abstract

PURPOSE:To rapidly switch stages and to improve the working rate of equipment by moving a sink roll with one end connected to a rotating shaft to a standby position while dipping the roll in a plating bath, and producing a cold- rolled steel sheet. CONSTITUTION:A heat-treated steel sheet 1 is dipped in the plating bath 2 and traveled by the turndown roll 3, sink roll 5, and deflectro roll 4 along the path of the steel sheet 1. Consequently, both sides of the steel sheet 1 are plated to produce a plated steel sheet. One end of the sink roll 5 dipped in the plating bath 2 is connected to the vertical rotating shaft through a bearing 6, and the other end is supported by a bearing 10. The rotating shaft is supported by a frame 9, and made freely rotatable. When the plating stage is switched over to a cold-rolled steel sheet production stage, the bearing 10 is retreated by the operation of a cylinder 11, and the support of the sink roll 5 is released. A motor 8 of a rotating mechanism 7 is operated to move the sink roll 5 to a standby position through the rotating shaft and bearing 6, and the steel sheet 1 is released from the plating bath 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for switching pass lines from a plated steel plate manufacturing process to a cold rolled steel plate manufacturing process, or vice versa, in equipment for manufacturing plated steel sheets and cold rolled steel sheets. , relates to a retracting device that moves a sink roll between a movable position and a retracted position.

[Conventional technology]

For manufacturing cold-rolled steel sheets and hot-dip plated steel sheets in the same equipment, JP-A-53-132437 and JP-A-5
Dual-purpose production equipment proposed in JP 7-177965 and the like is known.

FIG. 8 shows the equipment disclosed in Japanese Unexamined Patent Publication No. 53-132437. The steel plate 81 that has undergone continuous heat treatment is passed through a turndown roll 82. Plating bath 83. The plate is passed through the sink roll 84 and the deflation rolls 85 and 86 in this order, and is hot-dip plated. On the other hand, when switching the hot-dip plated steel sheet manufacturing process to the cold-rolled steel sheet manufacturing process, the plating bath 83 is lowered by the lifting device 87 to expose the pass line of the steel sheet 81 from the plating bath 83. In this apparatus, it is necessary to replace the sink roll 84 to which plated metal is attached with a guide roll for threading the cold-rolled steel sheet.

FIG. 9 shows the equipment disclosed in Japanese Unexamined Patent Publication No. 57-177965. In this equipment, either a pass line passing through the plating bath 91 indicated by a dashed line or a pass line bypassing the plating bath 91 indicated by a dotted line is used.
Manufacture plated steel sheets or cold rolled steel sheets. A shear 92 is placed at the branch point of these two pass lines, and a welder 93 is placed at the confluence point. When switching from cold-rolled steel plate manufacturing process to hot-dip galvanized steel plate manufacturing process, 1 at the branch point.
．． [94 is cut by the shear 92, and the steel plate 94 is deflated crawl 9 by a threading device (not shown).
5.96. The steel plate 94 is immersed in a plating bath 91 by a sink roll 97, and then passed along a pass line passing through deflation rolls 98 and 99. At the confluence point, the steel plate 94 is welded by a welding machine 9.
Weld in step 3. On the other hand, when switching from the hot-dip galvanized steel sheet manufacturing process to the cold-rolled steel sheet manufacturing process, the steel plate 94 is cut by the shear 92 at the branching point, and the steel plate 94 is passed directly from the inlet deflation crawler 95 to the outlet deflation crawler 99. .

[Problem to be solved by the invention]

In the equipment shown in Japanese Patent Application Laid-Open No. 53-132437, a lifting device 87 for lifting and lowering the plating bath 83 is required. Since this plating bath 83 is heavy, for example, over 100 tons, the lifting device 87 is large-scale and requires a large burden on the equipment. On the other hand, in the equipment disclosed in JP-A-57-177965, there is no need to raise and lower the plating bath 91, resulting in high equipment costs due to the lifting device! There isn't.

However, the shear 92 for switching the board passage. Welding machine 93. Threading equipment, etc. is required, and its maintenance and
Management becomes complex. In either case, the line stoppage time necessary for switching the board passageway is extremely long, and the operating rate of the manufacturing equipment is degraded.

Therefore, the present invention moves the sink roll, which is immersed in the plating bath during the manufacturing process of plated steel sheets, to a retracted position during the manufacturing process of cold-rolled steel sheets, thereby raising the steel sheet immersed in the plating bath as it is, and plated the steel sheet. The purpose is to enable the machine to run along a pass line for manufacturing cold-rolled steel sheets that does not pass through a bath, to quickly change processes, and to improve the operating efficiency of equipment.

[Means to solve the problem]

In order to achieve this objective, the first sink roll retraction device of the present invention connects one end of the sink roll immersed in a plating bath to a vertically extending pivot shaft via a bearing, and connects the pivot shaft to a vertically extending pivot shaft. It is characterized by being rotatably mounted on the frame.

Further, the second sink roll retraction device is characterized in that one end of the shaft of the sink roll immersed in the plating bath is placed on a support that can be raised and lowered via a bearing, and a horizontal rotation mechanism is connected to the support. shall be.

〔Example〕

Hereinafter, features of the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 is a schematic diagram showing a plating bath incorporating a first evacuation device according to the present invention.

A plating bath 2 is arranged along the pass line of the steel plate 1, and a row of rolls is provided for dipping the steel plate 1 into or passing it above the plating bath 2. The roll row includes turndown rolls 3 and deflation rolls 4 arranged along the path of the heat-treated steel plate 1. Furthermore, various rolls, wiping nozzles, etc. are arranged downstream of the deflation crawler 4, as will be described later in the explanation of FIG. Further, since 1 fl of steel is immersed in the plating bath 2 to perform double-sided plating, a sink roll 5 is housed in the plating bath 2. This sink roll 5 is held by a turning mechanism so that it can take the posture shown by solid lines and broken lines in the figure.

FIG. 2 is a schematic diagram showing an example of a turning mechanism for the sink roll 5. FIG. One end of the sink roll 5 is connected to a swing drive mechanism 7 via a bearing 6.

This turning drive mechanism 7 is composed of an electric motor 8 provided outside the plating bath 2 and a frame 9 immersed in the plating bath 2, and allows the sink roll 5 to turn in a horizontal plane by rotation of the output shaft of the electric motor 8.

A bearing 10 provided at the other end of the sink roll 5 is detachable and can be moved forward and backward by a cylinder 11 provided outside the plating bath 2. The sink roll 5 is placed in a state in which it is connected to the bearing 10 as shown by the solid line in the figure, and in a state in which one end is left free by retracting the bearing 10 using the cylinder 11 to the position shown in the dashed line. Ru.

After separating the sink roll 5 and the bearing lO, the electric motor 8
By this operation, the sink roll 5 can be rotated to the position indicated by the dashed line in FIG. That is, in the posture shown by the solid line in which both ends of the sink roll 5 are supported by the bearings 6 and 10, the steel plate 1 is wound and passed as shown in FIG.
Both sides of the steel plate 1 can be plated. Also,
- If the posture is as shown by the dashed dotted line, the sink roll 5 is secured at a retracted position away from the pass line of the steel plate 1.

The procedure for plating the steel plate 1 using the plating bath 2 containing the sink roll 5 having the above-mentioned rotating mechanism will be explained with reference to FIG. Note that FIG. 3(a) shows the production of a cold-rolled steel sheet, and FIG. 3Cb) shows the case of double-sided plating.

A second deflector roll 12 is arranged downstream of the deflector roll 4, and a guide roll 13 having a structure that can be opened and closed with respect to the pass line and a wiping nozzle 14 for adjusting the amount of plating deposited are arranged in this order. These guide rolls 13 and wiping nozzles 14 are movable up and down, and when plating the steel plate 1, the guide rolls 13 are lowered to a level where they are immersed in the plating bath 2, as shown in FIG. 3(b). In addition, guide roll 1
3 and the wiping nozzle 14 may not be installed above the second deflector roll 12 and lowered, but may be lowered from a retracted state to the side of the deflector roll 12.

In FIG. 3(a), which shows the cold rolled steel sheet manufacturing process, the steel sheet 1 is passed from a turndown roll 3 to a deflector roll 4 to be bussed. When switching from this state to the plated steel plate manufacturing process, the steel plate 1 is first loosened downward as shown by the broken line in FIG. Simultaneously with this operation, the second deflector roll 12 is moved to the left as shown in FIG. Next, the slack of the steel plate 1 is further increased and the sink roll 5 is lowered to the extent that it can fit into the U-shaped bent portion of the steel plate 1. When the posture of the steel plate 1 becomes appropriate, the electric motor 8 of the swing drive mechanism 7 is activated, and the second
The sink roll 5 located at the position indicated by the dashed line in the figure is rotated to the position indicated by the solid line. By this turning operation, the sink roll 5 enters above the pass line of the steel plate 1 as shown in FIG. Further, the cylinder 11 moves the bearing lO in the direction of the sink roll 5 to connect them to each other, thereby maintaining the sink roll 5 in a correct posture.

After the above position setting of the sink roll 5 is completed, the slack in the steel plate 1 is taken up, and the guide roll 13 and the wiping nozzle 14 are lowered as shown in FIG. and,
By sandwiching the steel plate 1 between the guide rolls 13 and setting the wiping nozzle 14 to the wiping position at the same time, the steel plate 1 is bathed in the plating bath 2, making it possible to manufacture a double-sided plated steel plate.

Further, the switching operation from the double-sided plating shown in FIG. 3(5) to the cold-rolled steel sheet manufacturing process shown in FIG. 3(a) is performed in the reverse manner. That is, after raising the guide roll 13 and the wiping nozzle 14 and returning them to the position shown in FIG. 3(a), the steel plate 1 between the turndown roll 3 and the synchro 95 is loosened downward. When the amount of slack in the steel plate 1 does not interfere with the rotational movement of the sink roll 5, the bearing 10 is separated from the sink roll 5 by the cylinder 11, and the position is changed from the position of the solid line to the position of the broken line in FIG. Rotate the sink roll 5. Next, the second deflector roll 12 that had been evacuated
A cold-rolled steel sheet can be manufactured by returning the steel sheet 1 to its original position as shown in FIG. 3(a), removing any slack in the steel sheet 1, and winding it around the deflector roll 4 as shown in FIG. 3(a).

FIG. 4 is a schematic diagram showing a case where the steel plate 1 is plated on one side. Two further deflector rolls 15, 16 are provided along the path of the steel plate 1 between the turndown roll 3 and the deflector roll 4 shown in FIG. These deflector rolls 15 and 16 are equipped with a turning drive mechanism (not shown) similarly to the sink roll 5 shown in FIGS. In addition to manufacturing steel sheets, single-sided plating is also possible.

To switch from the manufacturing process to single-sided plating for the cold-rolled steel sheet shown in FIG.
Set it so that it can fit into the slack part of. Next, the differential reflex crawlers 15 and 16 are rotated by the rotation drive mechanism and set so as to be positioned above the path of the steel plate 1 as shown in FIG. After eliminating the slack in the steel plate 1, a single-sided plating device 18 equipped with a mobile molten metal pump 17
is set at an appropriate position on the plating of the steel plate 1. Note that, simultaneously with the setting of the single-sided plating device 18, the single-sided wiping nozzle 19 is moved forward in the direction of the deflation crawl 16.

By switching the pass lines as described above, the steel plate 1 is sprayed with molten metal from the single-sided plating device 18 while passing between the deflation crawlers 15 and 16, and a single-sided plated T3 plate is manufactured.

Furthermore, in order to switch from single-sided plating to production of cold-rolled steel sheets, the single-sided wiping nozzle 19 and the single-sided plating device 18 are first evacuated. Next, the steel plate 1 between the turndown roll 3 and the deflation crawler 4 is loosened, so that the two deflation crawlers 15 and 16 can turn. Then, after returning the differential reflex crawlers 15 and 16 to their original retracted positions, the slack in the steel 1ffl is taken up to form the path shown in FIG. 3(a). This allows the process to proceed to the production of cold-rolled steel sheets.

In the above example, a case has been described in which the sink roll 5 is movable between the operating position and the retracted position while being immersed in the plating bath 2. However, in equipment for manufacturing both plated steel sheets and cold-rolled steel sheets, a plating bath may be installed in or after the continuous heat treatment furnace. At times like this,
After leaving the heat treatment furnace, the steel plate is sent into the plating bath with its surface still highly active. Therefore, a closed plating bath in which the oxygen concentration of the atmosphere is kept low is used.

FIG. 5 shows an example of such a plating bath.

This plating bath 21 has furnace walls 22 and 23 whose lower ends are immersed.
This isolates the plated part from the outside air. This results in
The plating bath 21 has a liquid surface facing the plating part and a furnace wall 22.
It is separated into a liquid surface located outside of 23. Outside this area, plating metal injection and maintenance work are performed. Further, an inlet deflation crawl 24 is provided near the furnace wall 22, and a partition wall 25 is provided above the deflation crawl 24.
has been erected. This entry side deflation crawl 24 is
Compared to the conventional deflation crawl, it is placed closer to the liquid surface of the plating bath 21. Then, the steel plate 26 that has passed through the overaging chamber and reheating furnace of the continuous heat treatment furnace is sent to the entry side deflation crawl 24 through between the furnace wall 22 and the partition wall 25.

In the process of producing a plated steel plate, the steel plate 26 is immersed in the plating bath 21 along the pass line L1 from the inlet deflation roll 24, and is conveyed upward via the sink roll 27. During the process of passing through this plating bath 21, the surface of the steel plate 26 is plated. The excess plating metal adhering to the surface of the steel plate 26 is removed by the wiping nozzle 28 after the steel plate 26 leaves the plating bath 21. On the other hand, in the cold-rolled steel sheet manufacturing process, the steel sheet 26 is run along the path line L2 directly from the inlet deflation crawl 24 to the outlet deflation crawl 29 without passing through the plating bath 21.

In this cold-rolled steel sheet manufacturing process, the sink roll 27 is moved from the operating position shown in FIG. 5 to the retracted position. As this moving mechanism, the rotating type shown in FIGS. 1 and 2 can be used, but the range in which the sink roll 27 can be rotated by this method remains within the furnace wall 22, 23. By the way, the sink roll 27 suffers from wear on the roll surface,
Due to defects in rotation due to scratches or bearing wear, the rolls are periodically removed from the plating bath 21 and replaced with new rolls.

It is necessary to clean the surface of the roll and replace the bearing.

Therefore, as a second evacuation device, as shown in Fig. 6,
The plating bath 2 passes through the lower end of the furnace wall 23 and is released to the outside air.
The design is such that the sink roll 27 can be moved to the liquid level of 1. That is, the shaft 2 of the sink roll 27
9 is supported by a sink roll bearing 38, and this shaft 2
9 is dynamically connected to the connecting rod 30. This connecting rod 30 is placed on a support 32 via a bearing 31. Support 3
2 is movable up and down with an elevating cylinder 33, and a rotating cylinder 35 with a cylinder support 34 provided at the top.
is supported. A cylinder rod 36 of the swing cylinder 35 is connected to the bearing 31 via an arm 37. Thereby, the sink roll 27 can turn horizontally and move up and down.

FIG. 7 shows a state in which the sink roll 27 is moved to each position using this evacuation device. When manufacturing a plated steel plate, the sink roll 27 is immersed in the plating bath 21 with the axial direction of the sink roll 27 aligned with the width direction of the traveling steel plate 26, as shown in FIG. 2(a). When switching from this state to the cold-rolled steel plate production process or performing work such as replacing rolls, after loosening the steel plate 26, drive the swing cylinder 35 to move the connecting rod 30 as shown in FIG. , and the axial direction of the sink roll 27 is aligned with the steel plate 2.
6 in the longitudinal direction. And think roll 27
When lifting the plating bath 21 from the plating bath 21, the lifting cylinder 33 is driven as shown in FIG.

〔Effect of the invention〕

As explained above, the sink roll immersed in the plating bath is movable between the operating position and the retracted position, and when the steel plate is immersed in the plating bath, the sink roll is attached to the loop part of the steel plate. It is designed to hold the roll in place. Therefore, when switching between the production of cold-rolled steel sheets and hot-dip plated steel sheets, there is no need for equipment to raise and lower the plating bath as in the past, and there is no need to cut the steel sheets or replace rolls when switching between cold-rolled steel sheets and hot-dip galvanized steel sheets. Nor. In addition, with the second evacuation device, the sink roll can be taken out from a closed plating bath or the like to perform repairs, inspections, etc. without releasing the cloud surrounding air above the plating bath.

Therefore, switching between cold-rolled steel sheets and hot-dip plated steel sheets can be performed easily and in an extremely short time, improving the operating rate of manufacturing equipment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of equipment incorporating the first sink roll evacuation device, Fig. 2 shows an example of the rotating structure of the sink roll, and Fig. 3 is a steel plate during the production of cold-rolled steel sheets and hot-dip galvanized steel sheets. Fig. 4 shows the case of single-sided plating, Fig. 5 shows the plating bath in equipment for manufacturing plated steel sheets and cold-rolled steel sheets, and Fig. 6 shows the plating bath used in the equipment. The sink roll retraction device is shown, and FIG. 7 is a diagram for explaining its operation. On the other hand, FIGS. 8 and 9 are schematic diagrams showing conventional dual-purpose manufacturing equipment. 1, 26.81.94: Steel plate 2.21.83.
91: Plating bath 3.82: Turndown roll 5, 27.84.97 + sink roll 4, 12.15.16.24.29.85.86.95
．． 96.98.99: Deflation crawl 6.10: Bearing 7: Swing drive mechanism 8: Electric motor 9: Frame 11 Niji cylinder
13. Two guide rolls 14, 19.28: Wiping nozzle 17: Molten metal pump 18 Two single-sided plating equipment 22.
23: Furnace wall 25: Partition wall 29 Nishaft
30: Connecting rod 31: Bearing 32:
Support 33; Elevating cylinder 3.1 Niji cylinder support 35: Swivel cylinder 'A6; Cylinder rod 37: Arm 38 Nishin crawl bearing 8
7: Lifting device 92: Nya 93: Welding rock patent applicant Osamu Nippon Steel Co., Ltd.
Masu Kobori (2 people) Figure 1 Figure 2 Figure 3 (a) (b) Figure 4

Claims (1)

[Claims] 1. One end of the sink roll immersed in the plating bath is connected to a vertically extending pivot shaft through a bearing, and the pivot shaft is rotatably provided in the frame. A sink roll evacuation device for manufacturing equipment for both plated and cold-rolled steel sheets. 2. A plated steel plate and a cold rolled steel plate characterized in that one end of the shaft of a sink roll immersed in a plating bath is placed on a support that can be raised and lowered via a bearing, and a horizontal rotation mechanism is connected to the support. Sinking roll evacuation device in manufacturing equipment.