JP5629472B2 - Hot-dip metal strip production equipment - Google Patents

Description

The present invention relates to an apparatus for manufacturing a hot-dip metal strip for plating by immersing a metal belt that is continuously conveyed in a hot metal plating bath.

Generally, in a manufacturing apparatus for a hot-dip metal strip that is plated by immersing a metal belt that is continuously transported in a hot metal plating bath, the hot metal bath is plated via a sink roll provided in the hot metal plating bath. A predetermined plating thickness (adhesion amount) is obtained by wiping gas through a plating layer adhering to the metal strip coming out of the plating bath. In order to obtain a uniform plating adhesion amount, it is necessary to transport the metal band so that the surface of the metal band always passes through a certain position with respect to the gas wiping nozzle that ejects gas. Therefore, a bath support roll (guide roll) for supporting the metal strip is provided in the plating bath below the gas wiping nozzle to correct the warp in the width direction of the metal strip, and the surface of the metal strip is against the gas wiping nozzle. Pass through a certain position. Here, since the support roll in the bath (guide roll) always rotates in the plating bath, for example, as described in Patent Document 1, both sides of the rotation axis of the support roll in the bath (guide roll) are in the bath. The output shaft of the motor provided outside the plating bath is connected to one end side of the spindle via the plating bath outer coupling, and the other side of the spindle is inclined downward. A driving means is adopted that is immersed in the plating bath and connected to the other end of the spindle via a coupling in the bath provided on one end of the rotating shaft of the supporting roll (guide roll) in the bath.

JP 7-228960 A

However, bearings that support the rotating shafts of the support rolls (guide rolls) in the bath, for example, are placed in a severe plating bath of molten metal such as zinc. There is a problem that must be implemented. And since operation stops at the time of a maintenance, the problem that productivity of a hot-dip metal strip falls also arises. In addition, cylindrical sliding bearings are generally used as bearings, but in order to withstand harsh environments, for example, special specification products with a structure using ceramics etc. must be used. Since the structure of the driving means of the middle support roll (guide roll) becomes large, there is a problem that the equipment cost increases. In consideration of thermal expansion, the play allowance (backlash) between the rotating shaft and the bearing of the support roll in the bath (guide roll) is increased, so that vibration occurs in the support roll in the bath (guide roll). However, a variation (variation) in the amount of plating adhesion due to the vibration of the metal band occurs, resulting in a problem that the quality deteriorates.

The present invention has been made in view of such circumstances, and the equipment cost can be reduced by using a rolling bearing as a support roll in the bath (guide roll) that rotates and guides the metal strip in the plating bath. An object of the present invention is to provide an apparatus for manufacturing a hot dip metal strip that is inexpensive and enables high productivity and high quality of the hot dip metal strip.

An apparatus for manufacturing a hot-dip metal strip according to the present invention that meets the above-described object is a plating tank that holds a hot metal plating bath, and the direction of the metal band that is installed in the hot bath and enters the plating bath. Hot-dipped metal having a sink roll, a guide roll for guiding the direction-changed metal strip, and a gas squeezing means that is installed above the plating tank and adjusts the amount of hot-metal plating adhered to the front and back of the metal strip In the belt manufacturing equipment,
The plating tank is disposed on the plating tank main body and the upper part of the plating tank main body, and the bottom portion in which the opening for the metal strip to enter from below is immersed in the plating bath in the plating tank main body and enters. The open ceiling part through which the metal strip passes toward the outside has a partial bathtub that is located above the bath surface of the plating bath in the plating tank body, and the molten metal is supplied from the plating tank body to the part. Molten metal supply means for supplying to the bathtub is provided, and the bath surface height of the plating bath in the partial bath is maintained higher than the bath surface height of the plating bath in the plating tank body, and the guide roll is provided with the partial bath. The shafts of the guide rolls are disposed through the walls of the partial bath to the outside, and the shafts penetrating the walls are above the bath surface of the plating bath in the plating tank body. Placed outside the partial bathtub. They are supported respectively by bearings, moreover, the on the end of both the shank, cooling means are provided for cooling the region protruding from said portion tub to the outside of the both shaft portions.

In the apparatus for manufacturing a hot-dip metal strip according to the present invention, a part of the hot metal supplied from the inside of the plating tank main body into the hot bath by the hot metal supply means is supplied to the hot bath. It is preferable that an outflow portion is provided which overflows without contacting both the shaft portions and keeps the bath surface level of the plating bath in the partial bath constant.

In the apparatus for manufacturing a hot-dip metal strip according to the present invention, a sleeve through which the both shaft portions are inserted is provided in the wall portion through which the both shaft portions of the guide roll pass, and the both shaft portions in the sleeve are provided. It is preferable to provide a dam member that suppresses the molten metal in the partial bath from entering the gap in the gap between the outer circumferential surface and the inner circumferential surface of the sleeve.

In the hot dip metal strip manufacturing apparatus according to the present invention, it is preferable that the guide roll is rotationally driven and the rotational speed is adjustable.

In the apparatus for manufacturing a hot-dip metal strip according to the present invention, the guide roll can be a hot metal squeeze roll that forms a pair for removing excess molten metal adhering to both surfaces of the metal strip.
The guide roll may be a support roll in bath that supports the metal strip.
Furthermore, in the apparatus for producing a hot dipped metal strip, the guide roll is disposed in a bath supporting roll for supporting the metal strip, and an excess position of the guide roll adhering to both surfaces of the metal strip. It is good also as a molten metal squeezing roll used as the pair which removes a molten metal.

In the apparatus for producing a hot-dip metal strip according to the present invention, the bearing of the guide roll is provided outside the partial bathtub, so that wear due to operation is drastically reduced compared to the conventional case, and the frequency of equipment stoppage accompanying maintenance is reduced. Is drastically reduced and productivity is improved. In addition, it is not necessary to make the configuration of the bearing to be used as a special specification, the price of the bearing is reduced, and the equipment cost and the maintenance management cost can be greatly reduced. Further, the rotating guide roll has a simple configuration, and the equipment cost is low. And by providing the bearing outside the partial bathtub, it is not necessary to set a large allowance between the rotating shaft of the guide roll and the bearing in consideration of thermal expansion, and vibration of the guide roll that occurs during operation is eliminated. It is possible to suppress the deterioration of the quality of the hot dip metal strip. Even if the molten metal leaks from the wall portion of the partial bathtub, the leaked molten metal flows into the plating tank main body disposed below, so that it is safe and does not require extensive maintenance.

In the apparatus for producing a hot dipped metal strip according to the present invention, a part of the molten metal supplied from the plating tank body to the partial bath by the molten metal supply means is brought into contact with both shaft portions of the guide roll. If there is an outflow part that keeps the bath surface level of the plating bath in the partial bath constant without overflowing, both shaft parts of the guide roll will not be exposed to molten metal and the soundness of the guide roll will be reduced. It can be maintained for a long time.

In the apparatus for producing a hot-dip metal strip according to the present invention, a sleeve through which both shaft portions are inserted is provided in a wall portion through which both shaft portions of the guide roll pass, and the outer peripheral surface of both shaft portions in the sleeve and the inner portion of the sleeve are provided. When a weir member that suppresses the molten metal in the partial bath from entering the gap is provided in the gap with the peripheral surface, the depth of the gap in the partial bathtub is shallow, so the pressure of the molten metal acting on the gap However, it is possible to prevent the molten metal from flowing out of the partial bathtub to the outside with a simple configuration without using a shaft sealing means having a small and complicated configuration. As a result, equipment costs can be reduced, maintenance management can be facilitated, and maintenance management costs can be reduced.

In the hot dip metal strip manufacturing apparatus according to the present invention, when the guide roll is driven to rotate and the rotation speed can be adjusted, the guide roll and the metal plate can be used when the plate speed of the metal strip becomes high. The guide roll can be rotated at a high speed so that excessive slip does not occur between the two and the surface of the metal strip contacting the guide roll can be prevented from generating wrinkles.

In the manufacturing apparatus of molten plating metal strip according to the present invention, the end portions of both the shaft portion, the cooling means for cooling the region protruding outward from the portion tub of both shaft portions are respectively provided, in contact with bearing Thus, the temperature of both shaft portions can be lowered, and a general general-purpose bearing (rolling bearing) can be used.

In the apparatus for producing a hot-dip metal strip according to the present invention, when the guide roll is one of a hot metal squeeze roll, a support roll in bath, a support roll in bath and a hot metal squeeze roll, the vibration of the metal band is suppressed, It is possible to improve the quality of the hot-dip metal strip by preventing fluctuations in the amount of plating.

It is explanatory drawing of the manufacturing apparatus of the hot dip metal strip which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the support method of the support roll in a bath of the manufacturing apparatus of the same hot dip metal strip. (A) is explanatory drawing of the dam member provided in the manufacturing apparatus of the hot dip metal strip which concerns on the 2nd Embodiment of this invention, (B) is explanatory drawing of the dam member which concerns on a modification. It is explanatory drawing of the manufacturing apparatus of the hot dip metal strip which concerns on the 3rd Embodiment of this invention. It is explanatory drawing of the manufacturing apparatus of the hot dip metal strip which concerns on the 4th Embodiment of this invention. It is explanatory drawing of the manufacturing apparatus of the hot dip metal strip which concerns on the 5th Embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, a hot-dip metal strip manufacturing apparatus 10 according to a first embodiment of the present invention holds a hot metal plating bath (including a plating bath 21 and a plating bath 35). A plating bath 12, a sink roll 14 that is installed in the plating bath 12 and changes the direction of the metal band 13 that has entered the plating bath, and a pair of baths that are an example of a guide roll that guides the changed metal band 13. Middle support rolls 15, 16 and gas wiping nozzles 17, 18 which are a pair of gas squeezing means that are installed above the plating tank 12 and adjust the amount of molten metal plating adhered to the front and back of the metal strip 13 Have. Here, the molten metal forming the plating bath is, for example, zinc, aluminum, or an alloy thereof. This will be described in detail below.

The plating tank 12 includes a plating tank main body 19 and a partial bathtub 20 disposed on the upper part of the plating tank main body 19. Here, the plating tank main body 19 is a container having an open top. And the sink roll 14 is provided in the bottom part in the plating tank main body 19 so that rotation is possible with a bearing (not shown). Thereby, after the metal strip 13 continuously conveyed from obliquely above the plating tank body 19 is immersed (entered) in the plating bath 21 of the plating tank body 19, the direction can be changed upward.

The partial bathtub 20 is a mounting member (not shown) so that the bottom part is immersed in the plating bath 21 in the plating tank body 19 and the ceiling part is located above the bath surface 22 of the plating bath 21 in the plating tank body 19. It is attached to the upper part of the plating tank main body 19 via. Here, at the bottom of the partial bath 20, an opening 23 is formed through which the metal band 13 turned upward by the sink roll 14 enters from below, so that the metal band 13 that has entered the ceiling can pass outward. It is open to.

Further, in the partial bath 20, support rolls 15 and 16 in the bath are arranged in steps, and the metal strip 13 that passes through the metal strip 13 that has entered the partial bath 20 in contact with both surfaces at different height positions. I support it. Then, both shaft portions 24 and 25 of the supporting rolls 15 and 16 in the bath are connected to the through-holes 28 (inner diameters of the both bathtubs 20 and 27) formed in the wall portions 26 and 27, respectively. Considering the thermal expansion of the shaft portions 24 and 25 and the wall portions 26 and 27, a slight gap is formed between the inner peripheral surface of the through hole 28 and the outer peripheral surfaces of the shaft portions 24 and 25 during operation. Projecting to the outside. Even if the molten metal in the partial bath 20 leaks from a small gap formed between the inner peripheral surface of the through hole 28 and the outer peripheral surfaces of the shaft portions 24 and 25, the leaked molten metal is disposed below. Since it falls (inflows) into the plated bath main body 19, it is safe and does not require extensive maintenance.

Here, the shaft portions 24 and 25 penetrating through the wall portions 26 and 27 are disposed above the bath surface 22 of the plating bath 21 in the plating bath main body 19, and are arranged outside the partial bath 20, for example, the plating bath main body. 19 is supported by a pair of general-purpose bearings (rolling bearings) 30 provided on a gantry 29 that supports 19. One of the shaft portions 24 and 25 of the in-bath support rolls 15 and 16 is connected to the output shaft of the motor with a speed reducer via, for example, a rotation transmission mechanism (not shown) configured by a coupling. ing. By providing the support rolls 15 and 16 in the bath, the metal band 13 whose direction has been changed is guided, and the warp of the metal band 13 is corrected.

The plating bath 35 in the partial bath 20 and the plating bath 21 in the plating bath main body 19 communicate with each other through an opening 23 formed in the bottom of the partial bath 20. Further, a connecting pipe 34 provided with a pump 33 which is an example of molten metal supply means for supplying molten metal in the plating tank body 19 into the partial bath 20 is immersed in the plating bath 21 in the plating tank body 19. Is provided. Further, the upper part of the wall parts 65 and 66 different from the wall parts 26 and 27 through which both shaft parts 24 and 25 of the partial bath 20 pass are supplied from the inside of the plating tank body 19 into the partial bath 20 by the pump 33. The molten metal is partially overflowed without contacting the shafts 24 and 25 of the supporting rolls 15 and 16 in the bath, and the level of the bath surface 36 of the plating bath 35 in the partial bath 20 is kept constant. An outflow portion 37 is provided. Since both axial parts 24 and 25 do not receive molten metal, the soundness of the supporting rolls 15 and 16 in a bath can be maintained over a long period of time.

As shown in FIG. 1, gas wiping nozzles 17 and 18 that form a pair are spaced above the surface of the metal strip 13 pulled up from the plating bath 35 of the partial bath 20 above the partial bath 20. The metal strip 13 is disposed so as to face the width direction. Thereby, gas (for example, air, nitrogen, or an inert gas) is sprayed over the width direction of the metal strip 13, and a part of the molten metal adhering to the surface of the metal strip 13 is removed. The amount of adhesion is adjusted.

Then, the effect | action of the manufacturing apparatus 10 of the hot dip metal strip which concerns on the 1st Embodiment of this invention is demonstrated.
A bearing 30 that supports the shaft portions 24 and 25 of the supporting rolls 15 and 16 in the bath is provided outside the partial bath 20, for example, on a pedestal 29 that supports the plating tank main body 19, and melted metal as in the related art. It is not immersed in the plating bath. For this reason, the wear of the bearing 30 accompanying the operation is drastically reduced as compared with the conventional case, and the frequency of stopping the hot-dip metal strip manufacturing apparatus 10 accompanying maintenance (for example, replacement of the bearing 30) can be drastically reduced. As a result, the productivity of the hot-dip metal strip manufacturing apparatus 10 is improved. And since the bearing 30 is not immersed in the molten metal plating bath, it is not necessary to make the bearing 30 special, so the price of the bearing 30 is reduced, and the equipment of the manufacturing apparatus 10 for the hot-dip metal strip is reduced. Costs and maintenance costs can be significantly reduced.

By providing the bearings 30 of the in-bath support rolls 15 and 16 outside the partial bath 20, in consideration of thermal expansion, play between both shaft portions 24 and 25 of the in-bath support rolls 15 and 16 and the bearing 30 is provided. It is not necessary to set a large allowance, and vibrations of the supporting rolls 15 and 16 in the bath generated during operation can be suppressed and vibration of the metal strip 13 can be prevented. Thereby, the fluctuation | variation of the molten metal amount (plating adhesion amount) adhering to the metal strip 13 can be prevented, and it can prevent that the quality of the hot-plated metal strip 13 falls.

Further, since the bearings 30 of the support rolls 15 and 16 in the bath are not immersed in the molten metal plating bath, the rotation transmission mechanism that transmits the rotational force to the support rolls 15 and 16 in the bath can be used in the conventional plating bath. It is no longer necessary to use a spindle or the like that is partly immersed in the substrate, and the rotation transmission mechanism and the like can be made simple, and the equipment cost of the manufacturing apparatus 10 for the hot dip metal strip is reduced. In addition, since the rotation transmission mechanism and the like can have a simple configuration, it is possible to prevent vibration during rotation of the support rolls 15 and 16 in the bath and to rotate them accurately at a specified rotation speed. For this reason, the rotation speed of the support rolls 15 and 16 in the bath can be adjusted according to the plate feed speed (conveyance speed) of the metal strip 13, and between the support rolls 15 and 16 in the bath and the metal strip 13, Excessive sliding of the metal strip 13 can be prevented, and wrinkles can be prevented from being generated on the surface of the metal strip 13.

A connecting pipe 34 having a pump 33 is provided between the plating tank body 19 and the partial bath 20, and a part of the molten metal in the partial bath 20 is placed on both the support rolls 15 and 16 in the bath at the upper part of the partial bath 20. Since the outflow part 37 which overflows without contacting the axial parts 24 and 25 is provided, supply_amount | feed_rate of the molten metal supplied in the partial bathtub 20 from the inside of the plating tank main body 19 by the pump 31 is used. The amount of molten metal flowing from the partial bath 20 into the plating tank body 19 through the opening 23 formed in the bottom, the outer peripheral surfaces of the shafts 24 and 25 of the supporting rolls 15 and 16 in the bath, and the through holes By increasing the total outflow amount with the outflow amount of the molten metal flowing out from the gap between the inner peripheral surface of the molten metal 28, the molten metal is always allowed to flow out from the outflow portion 37, and the bath surface 36 of the plating bath 35 in the partial bath 20. The height of the plating tank book It can be held higher than the height of the bath surface 22 of the plating bath 21 in 19. Thereby, even if the bath surface 22 of the plating bath 21 in the plating tank main body 19 fluctuates during operation (for example, fluctuates up and down in a range of about 10 mm), the bath surface 36 level of the plating bath 35 in the partial bath 20 Can always be maintained at a constant level, and the amount of molten metal adhering to the metal strip 13 (plating adhesion amount) is stabilized.

The hot-dip metal strip manufacturing apparatus 38 according to the second embodiment of the present invention shown in FIG. 3 (A) has a wall in comparison with the hot-dip metal strip manufacturing apparatus 10 according to the first embodiment. The sleeves 39 that protrude into the partial bath 20 are attached to the wall portions 26 and 27 so that the axial center positions thereof coincide with the center positions of the through holes 28 formed in the portions 26 and 27, respectively. It is an example of a weir member that inserts both shaft portions 24 and 25 and suppresses molten metal from entering the sleeve 39 from the partial bath 20 into the outer peripheral portion of both shaft portions 24 and 25 in the sleeve 39. A feature is that a plurality of feed blades 40 for returning the molten metal that has entered the sleeve 39 into the partial bath 20 are provided. For this reason, only the feed blade 40 will be described, and the same components as those in the hot-dip metal strip manufacturing apparatus 10 will be denoted by the same reference numerals and description thereof will be omitted.

The feed blades 40 are provided in multiple stages in the axial direction, for example, at equal intervals in the circumferential direction (180 degrees in FIG. 3A) on the outer peripheral portions of the shaft portions 24 and 25 in the sleeve 39. When the feed blade 40 rotates in accordance with the rotation direction of the supporting rolls 15 and 16 in the bath, a flow is formed in the molten metal existing around the feed blade 40 from the sleeve 39 toward the partial bath 20. As described above, the shape of the feed blade 40 is determined according to the rotation direction of the support rolls 15 and 16 in the bath. And since the depth of the through-hole 28 of the partial bathtub 20 is shallow, the fusion | melting which acts on the clearance gap between the outer peripheral surface of both the shaft parts 24 and 25 of the support rolls 15 and 16 in a bath, and the inner peripheral surface of the through-hole 28 is shown. Since the pressure of the metal is also reduced, by rotating the feed blade 40 together with the support rolls 15 and 16 in the bath, the through hole 28 formed by the molten metal in the partial bath 20 can be formed without using a complicated shaft sealing means. It can be prevented from flowing out to the outside.

FIG. 3B shows a dam member 41 according to a modification. The weir member 41 is provided in multiple stages in the axial direction on the inner peripheral surface of the sleeve 39 and the first ring member 42 provided in multiple stages in the axial direction on the outer peripheral portions of both shaft portions 24 and 25 in the sleeve 39, And a second ring member 44 in which a hole 43 through which both shaft portions 24 and 25 can pass is formed at the center portion, and when the both shaft portions 24 and 25 are inserted into the sleeve 39, the second ring The member 44 is sandwiched between first ring members 42 provided in the sleeve 39, and a slight gap is formed between the first and second ring members 42, 44. By adopting such a configuration, even if the molten metal in the partial bath 20 enters the sleeve 39, the molten metal is little between the first and second ring members 42 and 44 due to the surface tension of the molten metal. It is possible to prevent the molten metal from flowing out through the through hole 28 formed in the partial bath 20.

The hot-dip plated metal strip manufacturing apparatus 45 according to the third embodiment of the present invention shown in FIG. 4 is compared with the hot-dip metal strip manufacturing apparatus 10 according to the first embodiment in the partial bath 20. The guide rolls arranged on the metal strip 13 are a pair of molten metal squeezing rolls 46 and 47 that remove excess molten metal adhering to both surfaces of the metal strip 13, and guide the metal strip 13 whose direction has been changed by the sink roll 14. At the same time, the in-bath support rolls 48 and 49 for correcting the warp of the metal strip 13 are supported by bearings (not shown) provided in the plating tank body 19. For this reason, only the molten metal squeeze rolls 46 and 47 will be described, and the same components as those in the apparatus 10 for manufacturing a hot-dip metal strip will be denoted by the same reference numerals and description thereof will be omitted. The bearings of the support rolls 48 and 49 in the bath use special specifications with a structure using ceramic or the like inside, and the driving means of the support rolls 48 and 49 in the bath are the support means of the support rolls 48 and 49 in the bath. A driving means is used in which one end is connected to an electric motor by using a coupling in the bath outside the bath through a spindle partly immersed in the plating bath.

The molten metal squeeze rolls 46 and 47 are arranged so as to sandwich the metal band 13 that passes through both sides of the metal band 13 that has entered the partial bath 20 at the same height position. Then, both shaft portions (not shown) of the molten metal squeeze rolls 46 and 47 protrude to the outside through through holes (not shown) formed in the opposing wall portions 26 and 27 of the partial bathtub 20. Here, the inner diameter of the through hole is determined by taking into consideration the thermal expansion of both the shaft portions of the molten metal squeeze rolls 46 and 47 and the wall portions 26 and 27, and the outer peripheral surface of the through holes and the outer peripheral surfaces of both shaft portions during operation. It is adjusted so that a slight gap is formed between them. In addition, even if the molten metal in the partial bath 20 leaks from a small gap formed between the inner peripheral surface of the through hole and the outer peripheral surfaces of both shaft portions, the leaked molten metal is disposed below. Since it falls (inflows) into the tank body 19, it is safe and does not require extensive maintenance.

Both shaft portions of the molten metal squeezing rolls 46 and 47 penetrating the wall portions 26 and 27 are disposed above the bath surface 22 of the plating bath 21 in the plating tank main body 19, and are arranged outside the partial bath 20, for example, plating. Each is supported by a general-purpose bearing (rolling bearing) provided on a gantry 29 that supports the tank body 19. For this reason, the wear of the bearing accompanying the operation is drastically reduced as compared with the conventional case, and the replacement frequency of the bearing can be reduced. And since it is not necessary to make a bearing a special specification, the price of a bearing becomes low, and it becomes possible to reduce the installation cost and maintenance management cost of the manufacturing apparatus 45 of the hot dip metal strip.

Further, by providing the bearings of the molten metal squeeze rolls 46 and 47 outside the partial bath 20, the allowance between both shaft portions of the molten metal squeeze rolls 46 and 47 and the bearings is increased in consideration of thermal expansion. It is not necessary to set, and the vibration of the molten metal squeeze rolls 46 and 47 generated during operation can be suppressed, and the vibration of the metal strip 13 can be prevented. Thereby, the excess molten metal adhering to both surfaces of the metal strip 13 can be stably removed, the fluctuation of the amount of molten metal adhering to the metal strip 13 (plating adhesion amount) can be prevented, and the molten plated metal It is possible to prevent the quality of the belt 13 from deteriorating.

Furthermore, it connects with the output shaft of the electric motor with a reduction gear via the rotation transmission mechanism (not shown) comprised by the one side of the both shaft parts of the molten metal squeeze rolls 46 and 47, for example. Thus, the rotation transmission mechanism and the like can be made simple, and the equipment cost of the hot-dip metal strip manufacturing apparatus 45 is reduced. Since the rotation transmission mechanism and the like have a simple configuration, the molten metal squeeze rolls 46 and 47 can be prevented from vibrating during rotation and can be rotated with high accuracy at a specified rotation speed. For this reason, the rotational speed of the molten metal squeeze rolls 46 and 47 can be adjusted according to the sheet feeding speed (conveyance speed) of the metal strip 13, and between the molten metal squeeze rolls 46 and 47 and the metal strip 13, Excessive sliding of the metal strip 13 can be prevented, and wrinkles can be prevented from being generated on the surface of the metal strip 13.

The hot-dip metal strip manufacturing apparatus 50 according to the fourth embodiment of the present invention shown in FIG. 5 is compared with the hot-dip metal strip manufacturing apparatus 10 according to the first embodiment in the partial bath 20. The guide rolls arranged in the above are disposed in the upper positions of the support rolls 51 and 52 in the bath that support the metal strip 13 and the support rolls 51 and 52 in the bath, and excessively adhere to both surfaces of the metal strip 13. It is characterized by the molten metal squeeze rolls 53 and 54 that form a pair for removing the molten metal. And the structure of the support rolls 51 and 52 in a bath is the structure of the support rolls 15 and 16 in a bath of the manufacturing apparatus 10 of a hot-dip metal strip, and the structure of the hot metal squeeze rolls 53 and 54 in 3rd Embodiment. The structure of the molten metal squeeze rolls 46 and 47 of the hot dip metal strip manufacturing apparatus 45 is the same as that of the apparatus 45. For this reason, detailed description is omitted.

Both shaft portions of the supporting rolls 51 and 52 in the bath and both shaft portions of the molten metal squeezing rolls 53 and 54 penetrate the wall portions 26 and 27, respectively, and are above the bath surface 22 of the plating bath 21 in the plating tank body 19. Since it is disposed at a position and supported by general-purpose bearings (rolling bearings) provided on the outside of the partial bathtub 20, for example, the gantry 29 that supports the plating tank body 19, the wear of the bearings associated with the operation has conventionally been reduced. Compared to this, the frequency of bearing replacement can be greatly reduced. And since it is not necessary to make a bearing a special specification, the price of a bearing becomes low, and it becomes possible to reduce the installation cost and the maintenance management cost of the manufacturing apparatus 50 of the hot dip metal strip.

Further, by providing the bearings of the supporting rolls 51 and 52 in the bath and the molten metal squeezing rolls 53 and 54 outside the partial bath 20, both shafts of the rolls 51, 52, 53 and 54 are taken into consideration in consideration of thermal expansion. It is no longer necessary to set a large allowance between the part and the bearing, and vibrations of the rolls 51, 52, 53, 54 generated during operation can be suppressed and vibration of the metal strip 13 can be prevented. As a result, the amount of molten metal adhering to both surfaces of the metal strip 13 can be stabilized, and excess molten metal can be stably removed. As a result, fluctuations in the amount of molten metal (plating adhesion amount) adhering to the metal strip 13 can be prevented, and deterioration of the quality of the hot-plated metal strip 13 can be prevented.

Further, each of the shafts of the respective rolls 51, 52, 53, 54 and a rotation transmission mechanism (not shown) having a simple configuration including, for example, a gear, respectively, It can be connected to the output shaft, and the equipment cost of the hot-dip metal strip manufacturing apparatus 50 is reduced. Since the rotation transmission mechanism and the like have a simple configuration, it is possible to prevent vibration during rotation of each of the rolls 51, 52, 53, 54 and to rotate the rolls with a specified rotational speed with high accuracy. For this reason, the rotational speed of each roll 51, 52, 53, 54 can be adjusted according to the plate feed speed (conveyance speed) of the metal strip 13, and each roll 51, 52, 53, 54 and the metal strip 13 can be adjusted. In the meantime, excessive slippage of the metal strip 13 can be prevented, and wrinkles can be prevented from being generated on the surface of the metal strip 13.

The hot-dip metal strip manufacturing apparatus 55 according to the fifth embodiment of the present invention shown in FIG. 6 is a pair of baths compared with the hot-dip metal strip manufacturing apparatus 10 according to the first embodiment. It is characterized in that cooling means 58 for cooling a region protruding from the partial bathtub 20 of both shaft portions 57 to the outside is provided at the end portions of both shaft portions 57 of the middle support roll 56. For this reason, only the cooling means 58 will be described, and the same components as those in the apparatus 10 for producing a hot-dip metal strip will be denoted by the same reference numerals and description thereof will be omitted.

The cooling means 58 includes a hole 59 formed in the central portion of the shaft portion 57 from the end surface in the axial direction, and is attached to an end portion of the shaft portion 57 to cool the hole 59 formed in the shaft portion 57. And a rotary joint 60 that discharges water while supplying water. Here, the rotary joint 60 is attached to the end portion of the shaft portion 57 and rotates together with the shaft portion 57 while discharging the cooling water from the water discharge portion 61 and the hole portion 59 for supplying cooling water into the hole portion 59. The rotary body 62 having a circular cross section having a discharge port (not shown) to be rotated, and the rotary body 62 are rotatably mounted, and connected to the base of the water discharger 61 via a seal member to supply cooling water to the water discharger 61. It has a water injection section (not shown) to be supplied and an exterior body 63 provided with a drainage section (not shown) that is connected to a drain outlet via a seal member and drains cooling water to the outside. As a result, the cooling water supplied to the rotating body 62 via the exterior body 63 of the rotary joint 61 flows into the hole 59 from the tip of the water discharger 61 and fills the hole 59, and drains the rotating body 62. It flows into the drainage part of the exterior body 63 from the mouth and is discharged. As a result, the area | region which protruded outside from the partial bathtub 20 of the both axial parts 57 of the support roll 56 in a bath can be cooled. For this reason, it becomes possible to use a general general-purpose bearing (rolling bearing) for the bearing 64 that supports both shaft portions 57, and the equipment cost and maintenance management cost of the hot-dip metal strip manufacturing apparatus 55 can be reduced. It becomes possible.
Moreover, when driving the support roll 56 in a bath, it is preferable that the cooling means of the drive side shaft is air cooling (not shown) from the outside.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.

DESCRIPTION OF SYMBOLS 10: Manufacturing apparatus of hot dipped metal strip, 12: Plating tank, 13: Metal strip, 14: Sink roll, 15, 16: Support roll in bath, 17, 18: Gas wiping nozzle, 19: Plating tank main body, 20: Partial bathtub, 21: Plating bath, 22: Bath surface, 23: Opening, 24, 25: Shaft, 26, 27: Wall, 28: Through-hole, 29: Mount, 30: Bearing, 33: Pump, 34: Connecting pipe, 35: plating bath, 36: bath surface, 37: outflow part, 38: manufacturing apparatus for hot-dipped metal strip, 39: sleeve, 40: feed blade, 41: weir member, 42: first ring member, 43: Hole, 44: Second ring member, 45: Manufacturing apparatus for hot dip metal strip, 46, 47: Hot metal squeeze roll, 48, 49: Support roll in bath, 50: Manufacturing apparatus for hot dip metal strip, 51, 52: Support roll in bath, 53 54: Molten metal squeeze roll, 55: Manufacturing apparatus for hot dip plated metal strip, 56: Support roll in bath, 57: Shaft, 58: Cooling means, 59: Hole, 60: Rotary joint, 61: Water discharge part, 62 : Rotating body, 63: Exterior body, 64: Bearing, 65, 66: Wall part

Claims (7)

A plating tank for holding a molten metal plating bath, a sink roll that is installed in the plating tank and changes the direction of the metal band that has entered the plating bath, and a guide roll that guides the changed metal band, In the apparatus for producing a hot-dip metal strip, which is installed above the plating tank and has a gas throttling means for adjusting the amount of hot-metal plating attached to the front and back of the metal strip,
The plating tank is disposed on the plating tank main body and the upper part of the plating tank main body, and the bottom portion in which the opening for the metal strip to enter from below is immersed in the plating bath in the plating tank main body and enters. The open ceiling part through which the metal strip passes toward the outside has a partial bathtub that is located above the bath surface of the plating bath in the plating tank body, and the molten metal is supplied from the plating tank body to the part. Molten metal supply means for supplying to the bathtub is provided, and the bath surface height of the plating bath in the partial bath is maintained higher than the bath surface height of the plating bath in the plating tank body, and the guide roll is provided with the partial bath. The shafts of the guide rolls are disposed through the walls of the partial bath to the outside, and the shafts penetrating the walls are above the bath surface of the plating bath in the plating tank body. Placed outside the partial bathtub. Are respectively supported by the obtained bearing, moreover, the on the end of both the shank, characterized in that the cooling means for cooling the region protruding outward from the portion bathtub both said shaft portions are provided, respectively Equipment for hot-dip metal strip production. 2. The apparatus for manufacturing a hot dipped metal strip according to claim 1, wherein in the partial bath, a part of the molten metal supplied into the partial bath from the plating bath main body by the molten metal supply means is supplied to the guide roll. An apparatus for producing a hot dipped metal strip, wherein an outflow part is provided to allow the bath surface level of the plating bath in the partial bath to be kept constant by overflowing without contacting the two shaft parts. 3. The hot-dipped metal strip manufacturing apparatus according to claim 1, wherein a sleeve through which the two shaft portions are inserted is provided in the wall portion through which the both shaft portions of the guide roll penetrate, respectively. Production of a hot dipped metal strip, characterized in that a weir member is provided in the gap between the outer peripheral surface of the shaft portion and the inner peripheral surface of the sleeve to prevent the molten metal in the partial bath from entering the gap. apparatus. The apparatus for manufacturing a hot-dip metal strip according to any one of claims 1 to 3, wherein the guide roll is rotationally driven and the rotation speed is adjustable. . In the manufacturing apparatus of the hot dipped metal strip according to any one of claims 1 to 4, the guide roll is a hot metal squeezing roll which becomes a pair for removing excess molten metal adhering to both surfaces of the metal strip. An apparatus for producing a hot dipped metal strip, characterized in that: The manufacturing apparatus of the hot dip metal strip of any one of Claims 1-4 WHEREIN: The said guide roll is a support roll in a bath which supports the said metal strip, The manufacture of the hot dip metal strip characterized by the above-mentioned. apparatus. In the manufacturing apparatus of the hot dipped metal strip of any one of Claims 1-4 , the said guide roll is arrange | positioned in the upper position of the support roll in bath which supports the said metal strip, and this support roll in bath. An apparatus for producing a hot-dip metal strip, which is a hot metal squeeze roll that forms a pair for removing excess hot metal adhering to both surfaces of the metal belt.

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