JPH07179932A - Roll cooling installation for metal strip - Google Patents

Abstract

PURPOSE:To prevent the generation of the ununiformity of temp. distribution in the width direction of a strip by bringing the strip into contact with a cooling roll having many suction holes and arranging plural nozzle headers for ejecting coolant to the back surface of the strip. CONSTITUTION:In the roll cooling installation of a continuous annealing line, many suction holes 1 are bored on the whole surface of the cooling roll and the pressure in the inner part of the roll is made negative and the strip X is sucked and brought into contact with the roll. At the back surface of this strip X, three bent nozzle headers 2 are provided at the center and the right and left sides in the width direction of the cooling roll, and the width thereof is narrowed than the width of the strip, and slit like nozzles for gas ejection long in the horizontal direction are arranged in plural steps and supported with header supporting parts 20. The nozzle headers 2 can be shifted back and forth by a shifting table 30, and only the nozzle headers 2 at the right and the left sides can be shifted in the width direction of the strip X by the shifting tables 35. By this method, the ununiformity of the temp. distribution of the strip in the width direction of the strip X can be minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal band roll cooling device in a continuous annealing line for metal bands.

[0002]

2. Description of the Related Art In a roll cooling equipment in a continuous annealing line, a non-uniform temperature distribution often occurs in the metal band width direction, which causes problems in quality such as non-uniformity of material, buckling, defective shape or stripability. Has occurred. When such a nonuniform plate temperature distribution occurs in a molten zinc plating line or a tin plating line, uneven material, uneven plating adhesion, uneven gloss, or buckling of metal strips occur. Therefore, JP-A-61-12
No. 832 discloses a suction cooling roll in which a gas suction hole is provided on the roll surface and a negative pressure in the roll sucks the gas from the suction hole to bring the metal strip into close contact with the roll surface.

[0003]

When cooling a metal strip using the suction cooling roll group, if the temperature difference between the inlet side and the outlet side of these cooling roll groups is about 50 ° C to 100 ° C, the cooling is performed. The temperature distribution in the width direction of the metal strip on the roll-out side is certainly improved as compared with the case where only a normal cooling roll is used. However, when the temperature difference becomes about 150 ° C to 200 ° C, the temperature distribution in the width direction of the metal strip also occurs, and this tendency becomes larger as the temperature difference becomes larger, and when it becomes 200 ° C to 250 ° C, a major operational problem occurs. Becomes That is, the above-mentioned problems of quality such as non-uniformity of material, buckling and defective shape, and problems of threadability such as abnormal threading occur.

The present invention was devised in view of the above problems, and in a metal band roll cooling facility, even if the temperature difference between the inlet side and the outlet side of the cooling roll is large, the material is not uniform, buckling, This paper proposes a configuration that does not cause quality problems such as shape defects and problems of strip passing such as strip abnormalities.

[0005]

Therefore, the metal strip roll cooling equipment according to the present invention is provided with a cooling roll having a suction structure for bringing the metal strip into contact with it and cooling the same, and the contact back surface through the metal strip. And a nozzle header provided with a nozzle for ejecting the refrigerant.

The suction structure provided in the cooling roll is as follows.
It may correspond to the structure of the suction cooling roll that sucks inwardly through a suction hole provided on the roll surface. In that case, the suction holes may be provided on the entire surface of the cooling roll or may be provided on a part of the surface, but in the latter configuration, the position corresponding to the edge portion side of the metal strip to be contacted It is desirable that the suction hole be provided in the. This is because the edge portion side of the metal band floats up and the temperature of that portion tends to rise, and it is necessary to bring this portion into close contact with the roll surface for intensive cooling.

When the cooling roll is provided with the suction structure, the cooling roll is composed of a fixed inner cylinder and a rotatable outer cylinder which are coaxially arranged, and the suction hole is formed in the outer cylinder. If the structure is such that it has a structure in which the surface of the inner cylinder corresponding to the metal band contact surface side is opened and suction is carried out into the inner cylinder through the opening from the suction hole provided in the outer cylinder, the range required for adhesion of the metal band Therefore, the suction structure is provided on the cooling roll, and as a result, the suction gas amount can be reduced.
For the opening of the inner cylinder, if the angle of the maximum winding angle of the metal band or more is set as the opening angle range in the flow direction of the metal band, the efficiency becomes the highest.

On the other hand, the structure of the nozzle header for cooling the back surface may, of course, be a range covering the entire metal band width direction, or may be a structure in which at least two or more parts are provided in the same direction. good. In that case, if the nozzle header provided at least at the position corresponding to the edge portion side of the metal strip is configured to be movable in the width direction of the metal strip, the edge portion side with high temperature is concentrated in the widthwise plate temperature distribution. For the purpose of cooling the back surface, even if the plate width is changed or the high temperature portion is delicately moved, the nozzle header can be moved to an appropriate cooling position to cool the back surface.

Further, this type of cooling roll is of a type in which the cooling amount of each cooling roll can be individually adjusted by moving the cooling roll in the direction perpendicular to the roll axis to adjust the roll winding angle of the metal strip. If the nozzle header can be moved according to the movement of the cooling roll so that the nozzle header does not come into contact with the back surface of the metal strip by the movement of the cooling roll, or the proper distance from the back surface can always be maintained. good.

[0010]

With the above structure, in contrast to the effect of adhering to the metal band which is not sufficient with the suction structure of the cooling roll, the refrigerant is sprayed from the nozzle header toward the back surface of the metal band which is in contact with the cooling roll. This makes the pressure bonding effect of the roll from the back of the metal strip and the cooling effect on the back work synergistically, so that even if there is a large temperature difference between the inlet side and the outlet side of the cooling roll group, the sheet temperature distribution in the width direction of the metal strip becomes uneven. Can be minimized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1) FIGS. 1 to 3 show the construction of a roll cooling equipment for a strip X according to an embodiment of the present invention.

The structure of the cooling roll has a refrigerant passage in the vicinity of the roll surface, and as shown in FIG. 1, a large number of suction holes 1 are formed on the entire surface of the roll to adjust the inside to a negative pressure. It is provided with a structure of a suction roll that is sucked from the suction hole 1 at this time (the atmosphere sucked by this structure is returned to the roll cooling equipment via the suction blower). The cooling roll can be moved horizontally by a roll pushing device, and the pushing amount (roll winding angle) can be adjusted.

Further, a curved nozzle header 2 is provided on the rear surface of the contact portion of the strip X which comes into contact with the cooling roll, and this nozzle header 2 is provided with this as shown in FIGS. 1 to 3. A movable table 3 that moves in a direction orthogonal to the strip surface (hereinafter referred to as front-back direction) is installed outside the device.

Three nozzle headers 2 are provided in the center and left and right in the width direction of the cooling roll, and the bending size of this cooling roll is determined according to the maximum pushing amount of the following cooling roll. Further, each width is much narrower than the strip X width, and is designed according to the hot point width when the temperature distribution in the width direction becomes uneven. Further, a slit-shaped nozzle that is long in the horizontal direction is provided in a plurality of stages on the surface of the gas blowing side. Further, a header support portion 20 that supplies the cooling gas from the outside to the header 2 and supports the header 2 is provided behind it. Since the header support portion 20 projects outside the furnace shell, a heat-resistant non-metal bellows 21 is used between the periphery of the header support portion 20 and the penetration portion of the furnace shell to ensure a sufficient nozzle movement range while maintaining airtightness. I am able to secure it.

On the other hand, the movable table 3 includes a guide rail 31 installed on the fixed table 30 in the front-rear direction, a base 32 movable along the guide rail 31, and a drive device for moving the base 32 in the front-rear direction.
It consists of 33. As shown in FIG. 3, the central nozzle header 2 has its header support 20 fixed to this base 32 as it is. Further, as shown in FIG. 2, on the base 32, guide rails 34 which are independently erected in the left and right direction for the left and right nozzle headers, and respective lateral movement bases 35 movable along the guide rails 34 are provided. A drive device 36 for independently moving the horizontal moving table 35 in the left and right directions is provided, and the header supporting portions 20 of the left and right nozzle headers are fixedly supported on the horizontal moving table 35. Therefore, although the three nozzle headers 2 are simultaneously moved in the front-rear direction by the same amount by the driving device 33, the left and right nozzle headers 2 are independently driven by the driving device 36 in the width direction of the strip X (hereinafter referred to as the left-right direction). ) Will be moved to. The drive devices 33 and 36 are
Is a hydraulic cylinder, an electric cylinder, a combination of a ball screw and an electric motor, etc.
Further, if linear bearings are used as the guide rails 31 and 34, the movement can be performed with high accuracy.

In the structure of the first embodiment, when the inside of the cooling roll is made negative pressure and suction is performed from the suction hole 1, the strip X
Can be brought into close contact with the roll surface. Moreover, the cooling gas is sprayed by the nozzle header 2 on the back surface of the strip X that is in contact with the cooling roll (especially for the edge side of the strip X where the floating is severely lifted, the left and right nozzle headers 2 are moved. Since the cooling gas is sprayed to the rear surface of the strip X from that position, and from the fixed installation position of the central nozzle header 2 to the central portion of the strip X where the temperature tends to rise next to these portions, from the fixed installation position of the central nozzle header 2). Thus, it becomes possible to exert a synergistic effect on the roll X from the rear surface of the strip X and the rear surface cooling effect. If there is a change in the temperature distribution in the plate width direction due to a change in the plate width of the strip X, the left and right nozzle headers 2 are moved in the left and right directions, and the center position is the center of the hottest part of the edge part. You just have to come to the position. When the chill roll further moves in the horizontal direction to change the wrapping angle, the left and right and center nozzle headers 2 provided for cooling the back surface of the chill roll move in the same direction by the same amount, so that the strip X back surface In addition, the nozzle headers 2 do not come into contact with each other, and the distance from the back surface can always be maintained at an appropriate cooling distance (however, with respect to the movement of the nozzle header 2 in the front-back direction, the distance from the strip X is not always constant). Not what you have to
It can be set arbitrarily).

(Embodiment 2) FIG. 4 is a plan view of a roll cooling equipment according to Embodiment 2. In this embodiment, the structure of the cooling roll used therein corresponds to the edge portion side of the strip X to be passed. The same configuration is provided, except that the suction hole 1 is provided only within a range of ± 100 mm to be formed. For example, in the case of a plate size of 600 mm to 1000 mm,
When viewed from the roll center, the suction hole 1 is on the OP side and DR side.
The suction holes are provided in the range of 200 mm to 600 mm, respectively, and the suction holes are not formed in the range of 400 mm of the roll center portion. With such a structure, it is easy to manufacture, and the amount of suction of the atmosphere around the roll is reduced due to the reduction in the number of suction holes 1, so it is possible to reduce variable costs such as electricity bills.

(Embodiment 3) FIGS. 5 and 6 show a cross section of a cooling roll having a structure different from that of the embodiment 1 among the roll cooling equipment according to the embodiment 3. Similar to the second embodiment, the second embodiment has the same configuration as that of the first embodiment. The cooling roll of the present embodiment is composed of a fixed inner cylinder 70 and a rotatable outer cylinder 80 that are provided coaxially, and the outer cylinder 80 has the suction holes.
1 is bored, the surface of the inner cylinder 70 corresponding to the strip X contact surface side is opened, and the suction hole 1 provided in the outer cylinder 80 is formed.
Is sucked into the inner cylinder 70 through the opening 71. That is, one roll shaft 72a of the inner cylinder 70 is supported by one end plate 80a of the outer cylinder 80 via a bearing 81a, and the other roll shaft 72b of the inner cylinder 70 is attached to the end plate 80b of the outer cylinder 80. It is inserted through the provided insertion hole 82 and protruded to the outside, and is fixedly supported by a support base 83 installed on the floor or the like. In the outer cylinder 80, the end plate 80b is rotatably supported around the roll shaft 72b via a bearing 81b with respect to the roll shaft 72b of the inner cylinder 70, and the other end plate 80a projects and fixes the roll shaft 84a. The roll shaft 84a is rotatably supported by a bearing 85 installed on the floor or the like. The roll shaft 84a is driven by being connected to a drive motor (not shown) via a power transmission mechanism (not shown), whereby the outer cylinder 80 can be rotated. Further, as shown in FIG. 6, an opening 71 is provided on the circumferential surface of the inner cylinder 70 at an opening angle of θ + 10 ° which is larger by 5 ° above and below the maximum winding angle θ of the strip X, and the opening 71 is formed. Inner cylinder within the range provided
70 The outer peripheral surface is recessed to a specified depth, and the suction hole 1
It is made easy to suck into the inner cylinder 70 through the opening 71. However, in the portion corresponding to the central portion in the roll axial direction, neither the inner cylinder 70 nor the outer cylinder 80 is provided with the structure of the suction hole 1 and the opening 71 as in the case of the second embodiment, and the strip X to be contacted is not provided.
These configurations are installed only in the portion corresponding to the edge portion side of. In addition, between the outer peripheral surface of the inner cylinder 70 where the opening 71 is not provided and the inner peripheral surface of the outer cylinder 80, a minute gap is provided so as not to hinder the rotation of the outer cylinder 80. Further, the outer cylinder 80
Is provided with a refrigerant passage 86 in its thick surface portion, and communicates with rotary joints 89a and 89b attached to the roll shaft 84a and the roll shaft 84b on the opposite side via a box 87 and a pipe 88 communicating with the refrigerant passage 86, respectively. Has been
By these cooling water circulation systems, cooling water flows into the refrigerant passage 86 and cools the strip X that contacts the outer cylinder 80. In addition, the cooling roll according to the present embodiment has the same structure as that of the moving table 3 as in the above-described two embodiments, and it is possible to change the roll pushing amount (strip winding angle) by the structure. .

One roll shaft 72b of the inner cylinder 70 is attached to the inner cylinder 70.
A communication hole 73 communicating with the hollow portion is provided, and if suction is performed from the communication hole 73 using a suction blower (not shown), the external atmosphere is sucked from the suction hole 1 of the outer cylinder 80 into the hollow portion of the inner cylinder 70. can do. On the other hand, the outer cylinder 80 is rotated around the inner cylinder while being in contact with the strip X, and the surface of the strip X is cooled by the contact surface thereof. At this time, the strip X is sucked by the suction hole 1 to roll the strip X. Can be closely attached to. In this case, in the configuration of the above embodiment, the strip X
The cooling roll is provided with a suction structure within a range necessary for the close contact (ie, the opening 71 of the inner cylinder 70 is provided at an angle slightly larger than the maximum wrap angle of the strip X of the outer cylinder 80).
Therefore, as a result, the amount of suction gas can also be reduced. Of course, since the cooling gas is sprayed from the nozzle header 2 to the back surface of the strip X which is in contact with the cooling roll, the roll pressure bonding effect and the back surface cooling effect from the back surface of the strip X can be made to act together.

When the above three embodiments, the structure of only the normal cooling roll, the structure of the conventional suction cooling roll, and the structure in which the nozzle header for back surface cooling is combined with the normal cooling roll are used, respectively, An experiment was conducted to examine the plate temperature distribution of the strip X cooled with these configurations.
7 to 11 show widthwise plate temperature distributions when the temperature difference ΔT on the inlet and outlet sides of the roll cooling equipment obtained during the experiment is 200 ° C. to 250 ° C. The W-shaped plate temperature distribution as shown in FIG. 7 (a hot point is generated at the edge portion and the central portion of the strip X) generated when only the normal cooling roll is used is obtained by using the conventional suction cooling roll. Even if it was, as shown in FIG. 8, the tendency has not changed much. On the other hand, when cooling is performed by combining a normal cooling roll with a nozzle header for rear surface cooling,
As shown in, the plate temperature deviation as described above can be reduced to some extent, but if the backside gas jet capability of the nozzle header is increased too much, the plate temperature located around the hot point is not originally high. Therefore, the plate temperature distribution will not be constant. On the other hand, when cooling is performed using the configuration of the first embodiment, the synergistic action of the strip adhesion effect to the roll surface, the strip pressure bonding effect from the back surface, and the back surface cooling effect results in
As shown in 0, there is almost no plate temperature deviation particularly at the strip X edge portion, and the plate temperature distribution in the plate width direction is also substantially uniform. Further, in the cases of Examples 2 and 3, substantially the same plate temperature uniformity was obtained, and as shown in FIG. 11, the same effect as that of Example 1 was obtained for the edge portion, but the example of the central portion was obtained. It becomes a little more uneven than 1.
However, there is no particular problem in terms of quality.

Table 1 below shows a uniform cooling effect in the plate width direction (uniform cooling effect in the table) and a hot point concentrated cooling effect when the configurations shown in Examples 1 to 3 above are used for roll cooling equipment for strip X. Regarding the concentrated cooling effect in the table) and the cooling air volume reduction effect (variable cost in the table), the case of Example 1 is 1
The results of comparison are shown when each evaluation is performed as 0 (the former two are more effective as the number is larger and the variable cost is smaller as the number is more effective). Example 1 is excellent in the uniform cooling effect in the width direction and the hot point concentrated cooling effect, and is suitable for the thin wide line [plate width W / plate thickness t> 3000] in which quality and stripability are important. On the other hand, in the case of Example 2 and further Example 3, there is an advantage that the variable cost becomes low, and plate passing property is not so required 2000 <(W
/ T) <3,000 lines are effective.

[0023]

[Table 1]

(Embodiment 4) FIG. 12 shows the structure of a roll cooling facility provided in a continuous annealing line for strips X according to another embodiment of the present invention. In the vertical roll cooling equipment surrounded by the furnace shell in this embodiment, the strip X is used.
The suction cooling rolls # 1 to # 7 are continuously provided in the vertical direction between the inlet side bridle roll ε1 and the outlet side bridle roll ε2 that apply a predetermined tension to the horizontal direction of each of the cooling rolls. Is moved to adjust the contact length with the strip X. Further, nozzle headers α _{1 to} α ₇ are provided on the rear surface of the strip X contact portion with the suction cooling rolls # 1 to # 7, which are integrally formed in the width direction. As shown in FIG. 13, the nozzle header α has a plurality of nozzle headers 2 over the entire width of the strip X.
Have a fixed configuration. These nozzle headers α can of course be moved along with the horizontal movement of the cooling roll so as to maintain an appropriate separation distance in the same direction. In the figure, 4 is the inlet profile thermometer, 5 is the roll cooling facility outlet plate thermometer, 6 is the outlet profile thermometer,
Further, β ₁ and β _{2 respectively} indicate the post-stage gas cooling equipment (this equipment is not always necessary because the front-stage roll cooling is used when the cooling including uniform cooling is insufficient).

The above-mentioned Embodiment 4 shows the constitution when applied to the vertical type roll cooling equipment, but the constitution of the present invention is applied to the horizontal path roll cooling equipment shown in FIG. It is also possible to do so. Further, in the back surface cooling configuration of the first to third embodiments, the nozzle header is divided into three parts, the both edge parts and the central part, and both edge parts are movable in the roll axis direction. As shown in FIG. 13, even if a plurality of nozzle headers are arranged side by side and fixed, the same effect as in the above embodiment can be obtained (however, it corresponds to the central portion and the edge portion of the strip X). Only the nozzle header at the position should be used for cooling the back surface). Further, as in the latter-stage gas cooling equipment shown in β ₁ and β ₂ in FIG. 12 and the like, an auxiliary cooling structure is provided in front of and behind the cooling roll (group) for adjustment cooling for the purpose of alleviating the plate temperature deviation. It goes without saying that it may be provided.

[0026]

According to the metal strip roll cooling equipment of the present invention described in detail above, in contrast to the metal strip adhesion effect which is not sufficient only with the conventional suction cooling roll configuration, the metal strip further contacting the cooling roll is provided. When the refrigerant is sprayed from the nozzle header toward the back side, the roll compression effect from the back side of the metal strip and the back side cooling effect act synergistically, and when the temperature difference between the inlet side and the outlet side of the cooling roll group is significant. However, it is possible to minimize the nonuniform plate temperature distribution in the width direction of the metal. Therefore, the problem of quality such as non-uniformity of material of metal strip, buckling, defective shape, etc., which is said to be likely to occur in the equipment, and the problem of plate passing such as plate passing abnormality are eliminated.

[Brief description of drawings]

FIG. 1 is a plan view showing details of a roll cooling facility configuration according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a backside cooling configuration on both sides of the strip in the roll cooling facility configuration.

FIG. 3 is an explanatory diagram showing a backside cooling configuration on the strip central portion side in the roll cooling facility configuration.

FIG. 4 is a plan view showing details of the configuration of roll cooling equipment according to a second embodiment.

FIG. 5 is a cross-sectional view showing an internal configuration of a cooling roll used therein of a roll cooling facility according to a third embodiment.

FIG. 6 is a side sectional view showing the internal structure of the cooling roll.

FIG. 7 is a graph showing a strip temperature distribution in the strip width direction cooled by a roll cooling facility using only a conventional cooling roll.

FIG. 8 is a graph showing a strip temperature distribution in the strip width direction cooled by a roll cooling facility using only a conventional suction cooling roll.

FIG. 9 is a graph showing a strip temperature distribution in a strip width direction cooled by a roll cooling facility using a configuration in which a nozzle header for back surface cooling is combined with a normal cooling roll.

FIG. 10 is a graph showing the strip temperature distribution in the strip width direction cooled by the roll cooling facility having the configuration of Example 1.

FIG. 11 is a graph showing strip temperature distribution in the strip width direction cooled by the roll cooling equipment having the configurations of Examples 2 and 3.

FIG. 12 is an explanatory diagram showing a continuous annealing line configuration of a strip X provided with roll cooling equipment according to a fourth example of the present invention.

FIG. 13 is a perspective view showing a configuration in which a plurality of nozzle headers for cooling the back surface are arranged side by side over the entire width of the strip.

FIG. 14 is a furnace cross-sectional view showing a configuration when the configuration of the present invention is applied to a horizontal path roll cooling facility.

FIG. 15 is a perspective view showing a configuration in which a plurality of nozzle headers for cooling the back surface are aligned and fixed in the width direction.

[Explanation of symbols]

 1 Suction hole 2 Nozzle header 3 Moving stand # 1 to # 7 Cooling roll X strip

Claims (9)

[Claims] 1. A cooling roll provided with a suction structure for contacting a metal strip to cool it, and a nozzle header provided with a nozzle for ejecting a refrigerant onto the back surface of the contact through the metal strip. Cooling equipment for metal strip rolls. 2. The metal strip roll cooling equipment according to claim 1, wherein the suction structure provided on the cooling roll comprises:
The cooling equipment for metal strip rolls according to claim 1, wherein the equipment is configured to suck inside through a suction hole provided on the surface of the roll. 3. The metal strip roll cooling equipment according to claim 2, wherein the suction holes are provided on the entire surface or a part of the surface of the cooling roll. Roll cooling equipment. 4. The metal strip roll cooling equipment according to claim 3, wherein when a part of the surface of the cooling roll is provided with the suction hole, the metal strip roll cooling device is provided at a position corresponding to the edge portion side of the metal strip to be contacted. A suction hole is provided, The 3rd aspect characterized by the above-mentioned.
Cooling equipment for metal strip rolls according to item. 5. The metal strip roll cooling equipment according to any one of claims 1 to 4, wherein the structure of the cooling roll comprises a fixed inner cylinder coaxially provided and a rotatable outer cylinder,
The outer cylinder has the suction hole, and the surface of the inner cylinder corresponding to the metal band contact surface side is opened, and the suction structure is configured to suck from the suction hole of the outer cylinder into the inner cylinder through the opening. The metal strip roll cooling equipment according to any one of claims 1 to 4. 6. The metal strip roll cooling equipment according to claim 5, wherein an angle equal to or larger than the maximum winding angle of the metal strip with respect to the opening of the inner cylinder is set as an opening angle range in the flow direction of the metal strip. The metal strip roll cooling equipment according to claim 5. 7. The metal strip roll cooling equipment according to claim 1, wherein the nozzle header is divided into at least two or more parts in the metal strip width direction. The metal strip roll cooling facility according to any one of claims 1 to 6. 8. The metal band roll cooling equipment according to claim 7, wherein at least a nozzle header provided at a position corresponding to an edge portion side of the metal band is movable in the metal band width direction. The metal strip roll cooling equipment according to claim 7, characterized in that. 9. The metal strip roll cooling equipment according to claim 1, wherein the nozzle is adjusted in accordance with the movement of a cooling roll which can be moved in a direction perpendicular to the roll axis to adjust the roll winding angle of the metal strip. The metal strip roll cooling equipment according to any one of claims 1 to 8, wherein the header is movable.